Journal Articles
|
Baştürk, İlhan; Özbek, Berna User-relay assisted cellular networks with multiple antennas Journal Article International Journal of Electronics, 2019, ISSN: 13623060. Links | BibTeX @article{Basturk2019,
title = {User-relay assisted cellular networks with multiple antennas},
author = {İlhan Baştürk and Berna Özbek},
doi = {10.1080/00207217.2019.1579368},
issn = {13623060},
year = {2019},
date = {2019-01-01},
journal = {International Journal of Electronics},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Baştürk, İlhan; Özbek, Berna Channel and queue aware joint relay selection and resource allocation for MISO-OFDMA based user-relay assisted cellular networks Journal Article Telecommunication Systems, 2018, ISSN: 15729451. Links | BibTeX @article{Basturk2018,
title = {Channel and queue aware joint relay selection and resource allocation for MISO-OFDMA based user-relay assisted cellular networks},
author = {İlhan Baştürk and Berna Özbek},
doi = {10.1007/s11235-017-0363-7},
issn = {15729451},
year = {2018},
date = {2018-01-01},
journal = {Telecommunication Systems},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, B; Şenol, ÖÖ; Kurt, GK Secure multiuser miso communication systems with limited feedback link Journal Article Annals of Telecommunications, pp. 1–10, 2018. BibTeX @article{pop00042b,
title = {Secure multiuser miso communication systems with limited feedback link},
author = {B Özbek and ÖÖ Şenol and GK Kurt},
year = {2018},
date = {2018-01-01},
journal = {Annals of Telecommunications},
pages = {1--10},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, B; Pischella, M; Ruyet, Le D Message-Passing Algorithm for Sum-rate Maximization in Multi-antenna Underlay D2D Communications Journal Article 2018 15th International Symposium on Wireless Communication Systems (ISWCS), pp. 1–5, 2018. BibTeX @article{pop00051b,
title = {Message-Passing Algorithm for Sum-rate Maximization in Multi-antenna Underlay D2D Communications},
author = {B Ozbek and M Pischella and Le D Ruyet},
year = {2018},
date = {2018-01-01},
journal = {2018 15th International Symposium on Wireless Communication Systems (ISWCS)},
pages = {1--5},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Pischella, M; Ozbek, B; Ruyet, Le D Interference-based Clustering for MIMO D2D Underlay Communications Journal Article 2018 26th European Signal Processing Conference (EUSIPCO), pp. 817–821, 2018. BibTeX @article{pop00075,
title = {Interference-based Clustering for MIMO D2D Underlay Communications},
author = {M Pischella and B Ozbek and Le D Ruyet},
year = {2018},
date = {2018-01-01},
journal = {2018 26th European Signal Processing Conference (EUSIPCO)},
pages = {817--821},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, B; Kurt, GK Spatial signature for secure MISO-OFDM systems Journal Article Electronics Letters, 54 (9), pp. 601–603, 2018. BibTeX @article{pop00076,
title = {Spatial signature for secure MISO-OFDM systems},
author = {B Ozbek and GK Kurt},
year = {2018},
date = {2018-01-01},
journal = {Electronics Letters},
volume = {54},
number = {9},
pages = {601--603},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Topal, OA; Kurt, GK; Özbek, B Key Error Rates in Physical Layer Key Generation: Theoretical Analysis and Measurement-Based Verification Journal Article IEEE Wireless Communications Letters, 6 (6), pp. 766–769, 2017. BibTeX @article{pop00030b,
title = {Key Error Rates in Physical Layer Key Generation: Theoretical Analysis and Measurement-Based Verification},
author = {OA Topal and GK Kurt and B Özbek},
year = {2017},
date = {2017-01-01},
journal = {IEEE Wireless Communications Letters},
volume = {6},
number = {6},
pages = {766--769},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, B; Bayrak, U Joint beamforming and power control technique for femtocell networks Journal Article Wireless Personal Communications, 95 (4), pp. 4903–4916, 2017. BibTeX @article{pop00053,
title = {Joint beamforming and power control technique for femtocell networks},
author = {B Özbek and U Bayrak},
year = {2017},
date = {2017-01-01},
journal = {Wireless Personal Communications},
volume = {95},
number = {4},
pages = {4903--4916},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özdoğan, Ö; Özbek, B; Kurt, GK Performance of limited feedback secure miso systems in temporally correlated channels Journal Article 2017 25th Signal Processing and Communications Applications Conference (SIU …, 2017. BibTeX @article{pop00054b,
title = {Performance of limited feedback secure miso systems in temporally correlated channels},
author = {Ö Özdoğan and B Özbek and GK Kurt},
year = {2017},
date = {2017-01-01},
journal = {2017 25th Signal Processing and Communications Applications Conference (SIU …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Yilmaz, SS; Özbek, B; Taş, M; Bengür, S Cell load based user association for professional mobile radio systems Journal Article 2017 10th International Conference on Electrical and Electronics Engineering …, 2017. BibTeX @article{pop00077,
title = {Cell load based user association for professional mobile radio systems},
author = {SS Yilmaz and B Özbek and M Taş and S Bengür},
year = {2017},
date = {2017-01-01},
journal = {2017 10th International Conference on Electrical and Electronics Engineering …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Karataş, A; Özbek, B; Bardak, ED; Sönmez, İ Cell load based user association for TETRA trunk systems Journal Article 2017 10th International Conference on Electrical and Electronics Engineering …, 2017. BibTeX @article{pop00078b,
title = {Cell load based user association for TETRA trunk systems},
author = {A Karataş and B Özbek and ED Bardak and İ Sönmez},
year = {2017},
date = {2017-01-01},
journal = {2017 10th International Conference on Electrical and Electronics Engineering …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Beyazıt, Esra Aycan; Özbek, Berna; Ruyet, Didier Le On stream selection for interference alignment in heterogeneous networks Journal Article Eurasip Journal on Wireless Communications and Networking, 2016, ISSN: 16871499. Abstract | Links | BibTeX @article{Beyazt2016,
title = {On stream selection for interference alignment in heterogeneous networks},
author = {Esra Aycan Beyazıt and Berna Özbek and Didier Le Ruyet},
doi = {10.1186/s13638-016-0575-7},
issn = {16871499},
year = {2016},
date = {2016-01-01},
journal = {Eurasip Journal on Wireless Communications and Networking},
abstract = {After publication of our work [1] we noticed the following modifications. Eq. (3) should be written as follows.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
After publication of our work [1] we noticed the following modifications. Eq. (3) should be written as follows. |
Beyazıt, Esra Aycan; Özbek, Berna; Le Ruyet, Didier On stream selection for interference alignment with limited feedback in heterogeneous networks Journal Article Transactions on Emerging Telecommunications Technologies, 2016, ISSN: 21613915. Abstract | Links | BibTeX @article{Beyazt2016a,
title = {On stream selection for interference alignment with limited feedback in heterogeneous networks},
author = {Esra Aycan Beyazıt and Berna Özbek and Didier Le Ruyet},
doi = {10.1002/ett.3074},
issn = {21613915},
year = {2016},
date = {2016-01-01},
journal = {Transactions on Emerging Telecommunications Technologies},
abstract = {CONTEXT Nocturnal enuresis or bedwetting is the most common type of urinary incontinence in children. It has significant psychological effects on both the child and the family. Enuresis nocturna is defined as the inability to hold urine during the night in children who have completed toilet training. It is termed as being "primary" if no continence has ever been achieved or "secondary if it follows at least 6 months of dry nights. The aim of this review was to assemble the pathophysiological background and general information about nocturnal enuresis. EVIDENCE ACQUISITION This review was performed by evaluating the literature on nocturnal enuresis published between 1970 and 2015, available via PubMed and using the keywords "nocturnal enuresis," "incontinence," "pediatric," "review," and "treatment." RESULTS Children with nocturnal enuresis produce urine at higher rates during the night, and may have lower bladder capacities. Some children with nocturnal enuresis may also have daytime urgency, frequency, and urinary incontinence. Treatment includes aggressive treatment of accompanying constipation or urinary tract infections, behavioral changes, and medical therapy. Alarm therapy remains the first-line treatment modality for primary nocturnal enuresis. High rates of patient compliance and relapse mean that alternative treatments remain on the agenda. CONCLUSIONS Nocturnal enuresis is a common problem that has multifaceted effects on both the child and the family. Due to multiple etiologic factors, nocturnal enuresis is still not clearly defined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
CONTEXT Nocturnal enuresis or bedwetting is the most common type of urinary incontinence in children. It has significant psychological effects on both the child and the family. Enuresis nocturna is defined as the inability to hold urine during the night in children who have completed toilet training. It is termed as being "primary" if no continence has ever been achieved or "secondary if it follows at least 6 months of dry nights. The aim of this review was to assemble the pathophysiological background and general information about nocturnal enuresis. EVIDENCE ACQUISITION This review was performed by evaluating the literature on nocturnal enuresis published between 1970 and 2015, available via PubMed and using the keywords "nocturnal enuresis," "incontinence," "pediatric," "review," and "treatment." RESULTS Children with nocturnal enuresis produce urine at higher rates during the night, and may have lower bladder capacities. Some children with nocturnal enuresis may also have daytime urgency, frequency, and urinary incontinence. Treatment includes aggressive treatment of accompanying constipation or urinary tract infections, behavioral changes, and medical therapy. Alarm therapy remains the first-line treatment modality for primary nocturnal enuresis. High rates of patient compliance and relapse mean that alternative treatments remain on the agenda. CONCLUSIONS Nocturnal enuresis is a common problem that has multifaceted effects on both the child and the family. Due to multiple etiologic factors, nocturnal enuresis is still not clearly defined. |
Baştürk, İ; Özbek, B Iterative Channel Estimation for Higher Order Modulated STBC-OFDM Systems with Reduced Complexity. Journal Article KSII Transactions on Internet & Information Systems, 10 (6), 2016. BibTeX @article{pop00059,
title = {Iterative Channel Estimation for Higher Order Modulated STBC-OFDM Systems with Reduced Complexity.},
author = {İ Baştürk and B Özbek},
year = {2016},
date = {2016-01-01},
journal = {KSII Transactions on Internet & Information Systems},
volume = {10},
number = {6},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, B Reduced feedback link design for device-relaying enhanced multiple-input single-output orthogonal frequency-division multiple access wireless systems Journal Article Electronics Letters, 52 (5), pp. 403–404, 2016. BibTeX @article{pop00081,
title = {Reduced feedback link design for device-relaying enhanced multiple-input single-output orthogonal frequency-division multiple access wireless systems},
author = {B Ozbek},
year = {2016},
date = {2016-01-01},
journal = {Electronics Letters},
volume = {52},
number = {5},
pages = {403--404},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Beyazıt, Aycan E; Özbek, B; Ruyet, Le D Heterojen ağlarda veri katarı seçimi tabanlı girişim hizalama için uyarlamalı sınırlı geri besleme yöntemi Journal Article IEEE, 2016. BibTeX @article{pop00082b,
title = {Heterojen ağlarda veri katarı seçimi tabanlı girişim hizalama için uyarlamalı sınırlı geri besleme yöntemi},
author = {Aycan E Beyazıt and B Özbek and Le D Ruyet},
year = {2016},
date = {2016-01-01},
journal = {IEEE},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Yılmaz, SS; Özbek, B; Taş, M; Bengür, S APCO25 için hücre seçim algoritmaları performansı Journal Article IEEE, 2016. BibTeX @article{pop00083b,
title = {APCO25 için hücre seçim algoritmaları performansı},
author = {SS Yılmaz and B Özbek and M Taş and S Bengür},
year = {2016},
date = {2016-01-01},
journal = {IEEE},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Baştürk, Ilhan; Özbek, Berna Radio resource management for user-relay assisted OFDMA-based wireless networks Journal Article AEU - International Journal of Electronics and Communications, 2016, ISSN: 16180399. Abstract | Links | BibTeX @article{Basturk2016b,
title = {Radio resource management for user-relay assisted OFDMA-based wireless networks},
author = {Ilhan Baştürk and Berna Özbek},
doi = {10.1016/j.aeue.2016.01.021},
issn = {16180399},
year = {2016},
date = {2016-01-01},
journal = {AEU - International Journal of Electronics and Communications},
abstract = {Orthogonal frequency division multiple access (OFDMA) based relay assisted networks are important for current and next-generation wireless networks since they have great potential to provide high data rate to users at anywhere, anytime. Towards that end, fixed relay assisted OFDMA networks are commonly utilized by the operators. However, they require supplementary costly infrastructure. User-relay assisted OFDMA-based networks are promising candidates to fulfill the demanding coverage and capacity requirements of future wireless networks in a cost efficient way. Thus, they have become popular as a complementary solution to fixed relay networks. Generic frame structure that divides the resource allocation frame into two subframes is mostly used in the literature for fixed and user-relay assisted networks in which it is assumed that a user can act as a destination and a relay simultaneously. However, it may be difficult to apply this assumption to practical systems because of the limitations of the current transceiver design. Thus, we propose a novel frame structure for user-relay assisted OFDMA-based wireless networks in order to cope with these drawbacks. The efficient radio resource management algorithms including relay selection and resource allocation are developed in order to exploit the opportunities of the proposed frame structure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Orthogonal frequency division multiple access (OFDMA) based relay assisted networks are important for current and next-generation wireless networks since they have great potential to provide high data rate to users at anywhere, anytime. Towards that end, fixed relay assisted OFDMA networks are commonly utilized by the operators. However, they require supplementary costly infrastructure. User-relay assisted OFDMA-based networks are promising candidates to fulfill the demanding coverage and capacity requirements of future wireless networks in a cost efficient way. Thus, they have become popular as a complementary solution to fixed relay networks. Generic frame structure that divides the resource allocation frame into two subframes is mostly used in the literature for fixed and user-relay assisted networks in which it is assumed that a user can act as a destination and a relay simultaneously. However, it may be difficult to apply this assumption to practical systems because of the limitations of the current transceiver design. Thus, we propose a novel frame structure for user-relay assisted OFDMA-based wireless networks in order to cope with these drawbacks. The efficient radio resource management algorithms including relay selection and resource allocation are developed in order to exploit the opportunities of the proposed frame structure. |
Beyazit, EA; Ozbek, B; Ruyet, Le D Interference alignment with improved stream selection in heterogeneous networks Journal Article Signal Processing and Communications Applications Conference (SIU), 2015 …, 2015. BibTeX @article{pop00044,
title = {Interference alignment with improved stream selection in heterogeneous networks},
author = {EA Beyazit and B Ozbek and Le D Ruyet},
year = {2015},
date = {2015-01-01},
journal = {Signal Processing and Communications Applications Conference (SIU), 2015 …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, B; Ruyet, Le D Feedback Strategies for Multiuser Systems Journal Article Feedback Strategies for Wireless Communication, pp. 165–190, 2014. BibTeX @article{pop00089,
title = {Feedback Strategies for Multiuser Systems},
author = {B Özbek and Le D Ruyet},
year = {2014},
date = {2014-01-01},
journal = {Feedback Strategies for Wireless Communication},
pages = {165--190},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, Berna; Ruyet, Didier Le Adaptive limited feedback links for cooperative multi-antenna multicell networks Journal Article Eurasip Journal on Wireless Communications and Networking, 2014, ISSN: 16871499. Links | BibTeX @article{Ozbek2014c,
title = {Adaptive limited feedback links for cooperative multi-antenna multicell networks},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1186/1687-1499-2014-193},
issn = {16871499},
year = {2014},
date = {2014-01-01},
journal = {Eurasip Journal on Wireless Communications and Networking},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, Berna; Ruyet, Didier Le; Pischella, Mylene Adaptive reduced feedback links for distributed power allocation in multicell MISO-OFDMA networks Journal Article IEEE Wireless Communications Letters, 2014, ISSN: 21622345. Links | BibTeX @article{Ozbek2014d,
title = {Adaptive reduced feedback links for distributed power allocation in multicell MISO-OFDMA networks},
author = {Berna Özbek and Didier Le Ruyet and Mylene Pischella},
doi = {10.1109/WCL.2013.120513.130743},
issn = {21622345},
year = {2014},
date = {2014-01-01},
journal = {IEEE Wireless Communications Letters},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Khanfir, H; Ruyet, DL; Özbek, B Reduced feedback load using user selection algorithms for the multiuser multi‐input single‐output systems Journal Article Transactions on Emerging Telecommunications Technologies 24 (7-8), pp. 809–819, 2013. BibTeX @article{pop00064b,
title = {Reduced feedback load using user selection algorithms for the multiuser multi‐input single‐output systems},
author = {H Khanfir and DL Ruyet and B Özbek},
year = {2013},
date = {2013-01-01},
journal = {Transactions on Emerging Telecommunications Technologies 24 (7-8)},
pages = {809--819},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Bastürk, I; Özbek, B; Ruyet, Le D Queue-aware resource allocation for OFDMA-based mobile relay enhanced networks Journal Article Wireless Communication Systems (ISWCS 2013), Proceedings of the Tenth …, 2013. BibTeX @article{pop00018cb,
title = {Queue-aware resource allocation for OFDMA-based mobile relay enhanced networks},
author = {I Bastürk and B Özbek and Le D Ruyet},
year = {2013},
date = {2013-01-01},
journal = {Wireless Communication Systems (ISWCS 2013), Proceedings of the Tenth …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, Berna; Ruyet, Didier Le Feedback channel designs for fair scheduling in MISO–OFDMA systems Journal Article EURASIP Journal on Wireless Communications and Networking, 2012. Abstract | Links | BibTeX @article{Ozbek2012a,
title = {Feedback channel designs for fair scheduling in MISO–OFDMA systems},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1186/1687-1499-2012-220},
year = {2012},
date = {2012-01-01},
journal = {EURASIP Journal on Wireless Communications and Networking},
abstract = {In the next generation of wireless communication, adaptive resource allocation techniques will play an important role to improve quality of service and spectral efficiency. In order to employ adaptive fairness scheduling for multiple-input single-output (MISO) orthogonal frequency-division multiple access (OFDMA), the channel state information (CSI) belonging to all users is required at the base station. However, the amount of feedback increases with the number of users, transmit antennas and subchannels. Therefore, it is important to perform a user selection at the receiver side without cooperation among the users and to quantize the CSI. In this article, the reduced feedback channel designs are examined for MISO–OFDMA systems while providing fairness between the users. In order to reduce the feedback rate, we choose the users considering their norm and orthogonality properties as well as their location in the cell. In order to limit the feedback rate, channel direction information is quantized by designing a specific codebook thanks to the proposed criterion. We obtain an expression to determine the amount of required feedback information for MISO–OFDMA systems to support more than one beam per subchannel for a given number of users, subchannels and transmit antennas. The performance results of the reduced feedback channel designs are evaluated for fair scheduling in wireless channels.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the next generation of wireless communication, adaptive resource allocation techniques will play an important role to improve quality of service and spectral efficiency. In order to employ adaptive fairness scheduling for multiple-input single-output (MISO) orthogonal frequency-division multiple access (OFDMA), the channel state information (CSI) belonging to all users is required at the base station. However, the amount of feedback increases with the number of users, transmit antennas and subchannels. Therefore, it is important to perform a user selection at the receiver side without cooperation among the users and to quantize the CSI. In this article, the reduced feedback channel designs are examined for MISO–OFDMA systems while providing fairness between the users. In order to reduce the feedback rate, we choose the users considering their norm and orthogonality properties as well as their location in the cell. In order to limit the feedback rate, channel direction information is quantized by designing a specific codebook thanks to the proposed criterion. We obtain an expression to determine the amount of required feedback information for MISO–OFDMA systems to support more than one beam per subchannel for a given number of users, subchannels and transmit antennas. The performance results of the reduced feedback channel designs are evaluated for fair scheduling in wireless channels. |
Özbek, B; Ayav, T; Yatır, MN; Kirişken, B Televizyon İzleme Ölçüm Sistemi Tasarımı/Television Rating Measurement System Design Journal Article EMO BİLİMSEL DERGİ, 1 (2), pp. 89–94, 2011. BibTeX @article{pop00092,
title = {Televizyon İzleme Ölçüm Sistemi Tasarımı/Television Rating Measurement System Design},
author = {B Özbek and T Ayav and MN Yatır and B Kirişken},
year = {2011},
date = {2011-01-01},
journal = {EMO BİLİMSEL DERGİ},
volume = {1},
number = {2},
pages = {89--94},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, B; Ayav, T; Yatır, MN; Kirişken, B Televizyon izleme ölçüm sistemi tasarımı Journal Article EMO, 2011. BibTeX @article{pop00094,
title = {Televizyon izleme ölçüm sistemi tasarımı},
author = {B Özbek and T Ayav and MN Yatır and B Kirişken},
year = {2011},
date = {2011-01-01},
journal = {EMO},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Aycan, Esra; Ozbek, Berna Interference scenarios and capacity performances for femtocell networks Journal Article 2011 7th International Conference on Electrical and Electronics Engineering (ELECO), 2011, ISBN: 978-605-01-0204-8. Abstract | BibTeX @article{Aycan2011b,
title = {Interference scenarios and capacity performances for femtocell networks},
author = {Esra Aycan and Berna Ozbek},
isbn = {978-605-01-0204-8},
year = {2011},
date = {2011-01-01},
journal = {2011 7th International Conference on Electrical and Electronics Engineering (ELECO)},
abstract = {In this paper, we present capacity performances of Femtocells considering different interference scenarios which are among femtocells and between femtocells and macrocell. The capacity performances are demonstrated for femtocells with both single and multiple transmit and receive antennas using Wireless Insite radio propagation software.textlesssuptextgreater1textless/suptextgreater},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, we present capacity performances of Femtocells considering different interference scenarios which are among femtocells and between femtocells and macrocell. The capacity performances are demonstrated for femtocells with both single and multiple transmit and receive antennas using Wireless Insite radio propagation software.textlesssuptextgreater1textless/suptextgreater |
Ruyet, Le D; Özbek, B Resource management techniques for OFDMA Journal Article Orthogonal Frequency Division Multiple Access Fundamentals and Applications …, 2010. BibTeX @article{pop00020d,
title = {Resource management techniques for OFDMA},
author = {Le D Ruyet and B Özbek},
year = {2010},
date = {2010-01-01},
journal = {Orthogonal Frequency Division Multiple Access Fundamentals and Applications …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, B; Ruyet, Le D; Khanfir, H Performance evaluation of multicast MISO–OFDM systems Journal Article annals of telecommunications-annales des télécommunications 63 (5-6), pp. 295–305, 2008. BibTeX @article{pop00012b,
title = {Performance evaluation of multicast MISO–OFDM systems},
author = {B Özbek and Le D Ruyet and H Khanfir},
year = {2008},
date = {2008-01-01},
journal = {annals of telecommunications-annales des télécommunications 63 (5-6)},
pages = {295--305},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ruyet, Le D; Özbek, B; Khiari, H Performance of multicast MISO–OFDM systems Journal Article Proc of 13th European wireless conference, Paris, 2007. BibTeX @article{pop00071,
title = {Performance of multicast MISO–OFDM systems},
author = {Le D Ruyet and B Özbek and H Khiari},
year = {2007},
date = {2007-01-01},
journal = {Proc of 13th European wireless conference, Paris},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ruyet, Le D; Ozbek, B; Khanfir, H Etude des performances des systemes de communication MISO avec voie de retour Journal Article 21° Colloque GRETSI, Troyes, FRA, 11-14 septembre, 2007 , 2007. BibTeX @article{pop00098,
title = {Etude des performances des systemes de communication MISO avec voie de retour},
author = {Le D Ruyet and B Ozbek and H Khanfir},
year = {2007},
date = {2007-01-01},
journal = {21° Colloque GRETSI, Troyes, FRA, 11-14 septembre},
volume = {2007},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, B; Ruyet, Le D Low complexity ZF receiver for orthogonal SFBC-OFDM in broadband wireless channels Journal Article Electronics Letters, 42 (8), pp. 479–481, 2006. BibTeX @article{pop00022d,
title = {Low complexity ZF receiver for orthogonal SFBC-OFDM in broadband wireless channels},
author = {B Ozbek and Le D Ruyet},
year = {2006},
date = {2006-01-01},
journal = {Electronics Letters},
volume = {42},
number = {8},
pages = {479--481},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, B; Ruyet, Le D Performance and complexity analysis of suboptimal MIMO detectors Journal Article Vehicular technology conference, 2005. VTC 2005-Spring. 2005 IEEE 61st 2 …, 2005. BibTeX @article{pop00049b,
title = {Performance and complexity analysis of suboptimal MIMO detectors},
author = {B Ozbek and Le D Ruyet},
year = {2005},
date = {2005-01-01},
journal = {Vehicular technology conference, 2005. VTC 2005-Spring. 2005 IEEE 61st 2 …},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, Berna; Ruyet, Le D Pilot-symbol-aided iterative channel estimation for OFDM-based systems Journal Article Electronics and Communications, 2005, ISBN: 1604238216. Abstract | BibTeX @article{Ozbek2005,
title = {Pilot-symbol-aided iterative channel estimation for OFDM-based systems},
author = {Berna Ozbek and Le D Ruyet},
isbn = {1604238216},
year = {2005},
date = {2005-01-01},
journal = {Electronics and Communications},
abstract = {In this paper, we propose a pilot-symbol-aided iterative chan- nel estimation for coded OFDM-based systems. We use the symbol APP provided by the channel decoder to form groups of virtual pilots. According to their reliabilities, we com- bine these groups to improve the channel estimation. We also compare},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, we propose a pilot-symbol-aided iterative chan- nel estimation for coded OFDM-based systems. We use the symbol APP provided by the channel decoder to form groups of virtual pilots. According to their reliabilities, we com- bine these groups to improve the channel estimation. We also compare |
Özbek, Berna; Yilmaz, Reyat The adaptive channel estimation for STBC-OFDM systems Journal Article Istanbul University - Journal of Electrical and Electronics Engineering, 2005, ISSN: 13030914. BibTeX @article{Ozbek2005a,
title = {The adaptive channel estimation for STBC-OFDM systems},
author = {Berna Özbek and Reyat Yilmaz},
issn = {13030914},
year = {2005},
date = {2005-01-01},
journal = {Istanbul University - Journal of Electrical and Electronics Engineering},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ruyet, Le D; Ozbek, B Systèmes MIMO et codage spatio-temporel Journal Article Revue de l’électricité et de l’électronique,, (4), 2005. BibTeX @article{pop00015c,
title = {Systèmes MIMO et codage spatio-temporel},
author = {Le D Ruyet and B Ozbek},
year = {2005},
date = {2005-01-01},
journal = {Revue de l’électricité et de l’électronique,},
number = {4},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ozbek, B; Ruyet, Le D Performance analysis of coded SFBC-OFDM systems with four transmit antennas Journal Article 9th International OFDM-Workshop, Sept., 2004 , 2004. BibTeX @article{pop00072,
title = {Performance analysis of coded SFBC-OFDM systems with four transmit antennas},
author = {B Ozbek and Le D Ruyet},
year = {2004},
date = {2004-01-01},
journal = {9th International OFDM-Workshop, Sept.},
volume = {2004},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Ruyet, Le D; Bertozzi, T; Ozbek, B Breadth first algorithms for APP detectors over MIMO channels Journal Article Communications, 2004 IEEE International Conference on, 2 , pp. 926–930, 2004. BibTeX @article{pop00001b,
title = {Breadth first algorithms for APP detectors over MIMO channels},
author = {Le D Ruyet and T Bertozzi and B Ozbek},
year = {2004},
date = {2004-01-01},
journal = {Communications, 2004 IEEE International Conference on},
volume = {2},
pages = {926--930},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
OZBEK, B; Ruyet, Le D; Bellanger, M Non-orthogonal space-time block coding design for 3 transmit antennas Journal Article 19° Colloque sur le traitement du signal et des images, FRA, 2003 , 2003. BibTeX @article{pop00099,
title = {Non-orthogonal space-time block coding design for 3 transmit antennas},
author = {B OZBEK and Le D Ruyet and M Bellanger},
year = {2003},
date = {2003-01-01},
journal = {19° Colloque sur le traitement du signal et des images, FRA},
volume = {2003},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Özbek, B; Ruyet, Le D; Bellanger, M On space-frequency block codes for unequal channels Journal Article Proc. 2nd COST 273 Workshop Broadband Wireless Local Access, 2003. BibTeX @article{pop00014bb,
title = {On space-frequency block codes for unequal channels},
author = {B Özbek and Le D Ruyet and M Bellanger},
year = {2003},
date = {2003-01-01},
journal = {Proc. 2nd COST 273 Workshop Broadband Wireless Local Access},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Books
|
Özbek, Berna; Ruyet, Didier Le Feedback strategies for wireless communication Book 2014, ISBN: 9781461477419. Links | BibTeX @book{Ozbek2014a,
title = {Feedback strategies for wireless communication},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9},
isbn = {9781461477419},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
|
Özbek, Berna; Ruyet, Didier Le Feedback strategies for wireless communication Book 2014, ISBN: 9781461477419. Links | BibTeX @book{Ozbek2014ab,
title = {Feedback strategies for wireless communication},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9},
isbn = {9781461477419},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
|
Incollections
|
Özbek, Berna; Ruyet, Didier Le; Özbek, Berna; Ruyet, Didier Le Feedback in MIMO Wireless Communication Incollection Feedback Strategies for Wireless Communication, 2014. Links | BibTeX @incollection{Ozbek2014h,
title = {Feedback in MIMO Wireless Communication},
author = {Berna Özbek and Didier Le Ruyet and Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9_4},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
|
Özbek, Berna; Ruyet, Didier Le; Özbek, Berna; Ruyet, Didier Le Feedback in SISO Single User Wireless Communication Incollection Feedback Strategies for Wireless Communication, 2014. Links | BibTeX @incollection{Ozbek2014i,
title = {Feedback in SISO Single User Wireless Communication},
author = {Berna Özbek and Didier Le Ruyet and Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9_3},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
|
Özbek, Berna; Ruyet, Didier Le; Özbek, Berna; Ruyet, Didier Le Feedback Strategies in LTE Systems Incollection Feedback Strategies for Wireless Communication, 2014. Links | BibTeX @incollection{Ozbek2014e,
title = {Feedback Strategies in LTE Systems},
author = {Berna Özbek and Didier Le Ruyet and Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9_8},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
|
Özbek, Berna; Ruyet, Didier Le; Özbek, Berna; Ruyet, Didier Le Feedback Strategies for Multiantenna Multiuser Systems Incollection Feedback Strategies for Wireless Communication, 2014. Links | BibTeX @incollection{Ozbek2014f,
title = {Feedback Strategies for Multiantenna Multiuser Systems},
author = {Berna Özbek and Didier Le Ruyet and Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9_6},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
|
Özbek, Berna; Ruyet, Didier Le; Özbek, Berna; Ruyet, Didier Le Background onWireless Communication Incollection Feedback Strategies for Wireless Communication, 2014. Links | BibTeX @incollection{Ozbek2014b,
title = {Background onWireless Communication},
author = {Berna Özbek and Didier Le Ruyet and Berna Özbek and Didier Le Ruyet},
doi = {10.1007/978-1-4614-7741-9_2},
year = {2014},
date = {2014-01-01},
booktitle = {Feedback Strategies for Wireless Communication},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
|
Ruyet, Didier; Özbek, Berna Resource Management Techniques for OFDMA Incollection 2010. Links | BibTeX @incollection{Ruyet2010,
title = {Resource Management Techniques for OFDMA},
author = {Didier Ruyet and Berna Özbek},
doi = {10.1201/9781420088250-c5},
year = {2010},
date = {2010-01-01},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
|
Inproceedings
|
Kose, Alper; Ozbek, Berna Resource Allocation for Underlaying Device-to-Device Communications Using Maximal Independent Sets and Knapsack Algorithm Inproceedings IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, 2018, ISBN: 9781538660096. Links | BibTeX @inproceedings{Kose2018,
title = {Resource Allocation for Underlaying Device-to-Device Communications Using Maximal Independent Sets and Knapsack Algorithm},
author = {Alper Kose and Berna Ozbek},
doi = {10.1109/PIMRC.2018.8580784},
isbn = {9781538660096},
year = {2018},
date = {2018-01-01},
booktitle = {IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Karatas, Azad; Ozbek, Berna; Sonmez, Ilker; Bengur, Sidika Load based cell selection algorithm for Tetra based professional mobile radio Inproceedings 24th Telecommunications Forum, TELFOR 2016, 2017, ISBN: 9788674666494. Links | BibTeX @inproceedings{Karatas2017,
title = {Load based cell selection algorithm for Tetra based professional mobile radio},
author = {Azad Karatas and Berna Ozbek and Ilker Sonmez and Sidika Bengur},
doi = {10.1109/TELFOR.2016.7818782},
isbn = {9788674666494},
year = {2017},
date = {2017-01-01},
booktitle = {24th Telecommunications Forum, TELFOR 2016},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Topal, Ozan Alp; Kurt, Güneş Karabulut; Özbek, Berna Space-frequency grouping based key extraction for MIMO-OFDM systems Inproceedings Proceedings of the International Symposium on Wireless Communication Systems, 2017, ISSN: 21540225. Abstract | Links | BibTeX @inproceedings{Topal2017a,
title = {Space-frequency grouping based key extraction for MIMO-OFDM systems},
author = {Ozan Alp Topal and Güneş Karabulut Kurt and Berna Özbek},
doi = {10.1109/ISWCS.2017.8108133},
issn = {21540225},
year = {2017},
date = {2017-01-01},
booktitle = {Proceedings of the International Symposium on Wireless Communication Systems},
abstract = {textcopyright 2017 IEEE. Latest developments in wireless communication networks push the limits of conventional security methods. Security can be improved with a secret key that is dynamically generated based on the surrounding physical environment. With this objective, physical layer security approaches can be implemented by means of simple signal processing methods. In this paper, we propose novel key extraction approaches based on spatial and frequency characteristics of the wireless environment. In a 2 × 2 MIMO-OFDM system, low key disagreement rates and key error rates are observed, proving the potential of physical layer key extraction techniques.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
textcopyright 2017 IEEE. Latest developments in wireless communication networks push the limits of conventional security methods. Security can be improved with a secret key that is dynamically generated based on the surrounding physical environment. With this objective, physical layer security approaches can be implemented by means of simple signal processing methods. In this paper, we propose novel key extraction approaches based on spatial and frequency characteristics of the wireless environment. In a 2 × 2 MIMO-OFDM system, low key disagreement rates and key error rates are observed, proving the potential of physical layer key extraction techniques. |
Özbek, Berna; Pischella, Mylene; Ruyet, Didier Le Interference management for multiuser multiantenna OFDMA underlaying device-to-device communications Inproceedings Proceedings of the International Symposium on Wireless Communication Systems, 2017, ISSN: 21540225. Links | BibTeX @inproceedings{Ozbek2017b,
title = {Interference management for multiuser multiantenna OFDMA underlaying device-to-device communications},
author = {Berna Özbek and Mylene Pischella and Didier Le Ruyet},
doi = {10.1109/ISWCS.2017.8108156},
issn = {21540225},
year = {2017},
date = {2017-01-01},
booktitle = {Proceedings of the International Symposium on Wireless Communication Systems},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Karatas, Azad; Ozbek, Berna; Bardak, Erinc Deniz; Sonmez, Ilker Cell selection algorithm performance for Tetra trunk Inproceedings 2016. Links | BibTeX @inproceedings{Karatas2016,
title = {Cell selection algorithm performance for Tetra trunk},
author = {Azad Karatas and Berna Ozbek and Erinc Deniz Bardak and Ilker Sonmez},
doi = {10.1109/siu.2016.7495755},
year = {2016},
date = {2016-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ozdogan, Ozgecan; Ozbek, Berna; Kurt, Gunes Karabulut Performance of secure multiuser MISO systems with threshold based user selection Inproceedings 2016. Abstract | Links | BibTeX @inproceedings{Ozdogan2016,
title = {Performance of secure multiuser MISO systems with threshold based user selection},
author = {Ozgecan Ozdogan and Berna Ozbek and Gunes Karabulut Kurt},
doi = {10.1109/siu.2016.7495841},
year = {2016},
date = {2016-01-01},
abstract = {textcopyright 2016 IEEE. Physical layer security is a promising approach to enable secure communications by considering the characteristics of wireless channels. In this work, we consider a multiple antenna multiuser system with an eavesdropper which is passive and its channel state information (CSI) is not available at transmitter. We we add artificial noise (AN) in the null space of legitimate user to disturb reception of eavesdropper. For the sake of ensuring secure communication, CSI has great impact on system performance. However, in order to estimate the channel of all users at transmitter, sending pilot signals from all these users increases the system overhead. We perform a threshold based user selection at the receiver side to reduce this overhead. Also, we investigate the effects of the proposed user selection on the secrecy capacity.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
textcopyright 2016 IEEE. Physical layer security is a promising approach to enable secure communications by considering the characteristics of wireless channels. In this work, we consider a multiple antenna multiuser system with an eavesdropper which is passive and its channel state information (CSI) is not available at transmitter. We we add artificial noise (AN) in the null space of legitimate user to disturb reception of eavesdropper. For the sake of ensuring secure communication, CSI has great impact on system performance. However, in order to estimate the channel of all users at transmitter, sending pilot signals from all these users increases the system overhead. We perform a threshold based user selection at the receiver side to reduce this overhead. Also, we investigate the effects of the proposed user selection on the secrecy capacity. |
Yilmaz, Simay; Ozbek, Berna; Tas, Murat; Bardak, Erinc Deniz Load based cell selection algorithm for Digital Mobile Radio Inproceedings International Congress on Ultra Modern Telecommunications and Control Systems and Workshops, 2016, ISSN: 2157023X. Links | BibTeX @inproceedings{Yilmaz2016b,
title = {Load based cell selection algorithm for Digital Mobile Radio},
author = {Simay Yilmaz and Berna Ozbek and Murat Tas and Erinc Deniz Bardak},
doi = {10.1109/ICUMT.2016.7765350},
issn = {2157023X},
year = {2016},
date = {2016-01-01},
booktitle = {International Congress on Ultra Modern Telecommunications and Control Systems and Workshops},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Özdoǧan, Özgecan; Kurt, Güneş Karabulut Secure multiuser MISO communication systems with quantized feedback Inproceedings IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, 2016, ISBN: 9781509032549. Abstract | Links | BibTeX @inproceedings{Ozbek2016a,
title = {Secure multiuser MISO communication systems with quantized feedback},
author = {Berna Özbek and Özgecan Özdoǧan and Güneş Karabulut Kurt},
doi = {10.1109/PIMRC.2016.7794561},
isbn = {9781509032549},
year = {2016},
date = {2016-01-01},
booktitle = {IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC},
abstract = {textcopyright 2016 IEEE. Physical layer security is a promising approach to provide secure communications by considering the characteristics of wireless channels. In this work, we propose a secure multiple input single output (MISO) multiuser system with a quantized feedback link. We assume that eavesdropper is passive and its channel state information (CSI) is not available at transmitter. In order to disrupt reception of a passive eavesdropper, we schedule more than one legitimate user. For the sake of ensuring secure communication, the CSI of legitimate users has great impact on overall performance of secrecy sum capacity. The proposed solution applies a semi-orthogonal selection with a specific codebook to reduce the quantization errors for legitimate user side while disrupting the reception of the eavesdropper. The proposed solution improved secrecy sum capacity while reducing the feedback overhead for secure MISO multiser system.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
textcopyright 2016 IEEE. Physical layer security is a promising approach to provide secure communications by considering the characteristics of wireless channels. In this work, we propose a secure multiple input single output (MISO) multiuser system with a quantized feedback link. We assume that eavesdropper is passive and its channel state information (CSI) is not available at transmitter. In order to disrupt reception of a passive eavesdropper, we schedule more than one legitimate user. For the sake of ensuring secure communication, the CSI of legitimate users has great impact on overall performance of secrecy sum capacity. The proposed solution applies a semi-orthogonal selection with a specific codebook to reduce the quantization errors for legitimate user side while disrupting the reception of the eavesdropper. The proposed solution improved secrecy sum capacity while reducing the feedback overhead for secure MISO multiser system. |
Beyazit, Esra Aycan; Ozbek, Berna; Ruyet, Didier Le Adaptive limited feedback scheme for stream selection based interference alignment in heterogeneous networks Inproceedings Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop, 2016, ISSN: 2151870X. Links | BibTeX @inproceedings{Beyazit2016,
title = {Adaptive limited feedback scheme for stream selection based interference alignment in heterogeneous networks},
author = {Esra Aycan Beyazit and Berna Ozbek and Didier Le Ruyet},
doi = {10.1109/SAM.2016.7569700},
issn = {2151870X},
year = {2016},
date = {2016-01-01},
booktitle = {Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Basturk, Ilhan; Ozbek, Berna Distance based selection for user-relaying in OFDMA-based wireless networks Inproceedings 2016. Links | BibTeX @inproceedings{Basturk2016a,
title = {Distance based selection for user-relaying in OFDMA-based wireless networks},
author = {Ilhan Basturk and Berna Ozbek},
doi = {10.1109/siu.2016.7495908},
year = {2016},
date = {2016-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Uslu, Merve; Tugrel, Halim Bahadir; Kurt, Gunes Karabulut; Ozbek, Berna Verification of channel reciprocity implementation in software defined radios Inproceedings 2016. Abstract | Links | BibTeX @inproceedings{Uslu2016,
title = {Verification of channel reciprocity implementation in software defined radios},
author = {Merve Uslu and Halim Bahadir Tugrel and Gunes Karabulut Kurt and Berna Ozbek},
doi = {10.1109/siu.2016.7495799},
year = {2016},
date = {2016-01-01},
abstract = {textcopyright 2016 IEEE. Channel estimation is one of the vital processes in wireless communication systems. Assuming that A and B are two communication nodes, coefficients of the channel from A node to B node, must be very similar to the coefficients of the channel from B node to A node, due to channel reciprocity. In this paper, channel reciprocity property is tested by using software defined radio kits in laboratory environment. Average amplitude and phase values of these two channel coefficients are compared. The result of these comparisons is that the average amplitude and phase values are close.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
textcopyright 2016 IEEE. Channel estimation is one of the vital processes in wireless communication systems. Assuming that A and B are two communication nodes, coefficients of the channel from A node to B node, must be very similar to the coefficients of the channel from B node to A node, due to channel reciprocity. In this paper, channel reciprocity property is tested by using software defined radio kits in laboratory environment. Average amplitude and phase values of these two channel coefficients are compared. The result of these comparisons is that the average amplitude and phase values are close. |
Yilmaz, Saadet Simay; Ozbek, Berna; Tas, Murat; Bengur, Sidika Performance of cell selection algorithms for APCO25 Inproceedings 2016. Links | BibTeX @inproceedings{Yilmaz2016a,
title = {Performance of cell selection algorithms for APCO25},
author = {Saadet Simay Yilmaz and Berna Ozbek and Murat Tas and Sidika Bengur},
doi = {10.1109/siu.2016.7495756},
year = {2016},
date = {2016-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Gökceli, Selahattin; Uslu, Merve; Kurt, Güneş Karabulut; Özbek, Berna; Alakoca, Hakan; Durmaz, Mehmet Akif Implementation of pre-FFT beamforming in MIMO-OFDM Inproceedings ELECO 2015 - 9th International Conference on Electrical and Electronics Engineering, 2016, ISBN: 9786050107371. Abstract | Links | BibTeX @inproceedings{Gokceli2016,
title = {Implementation of pre-FFT beamforming in MIMO-OFDM},
author = {Selahattin Gökceli and Merve Uslu and Güneş Karabulut Kurt and Berna Özbek and Hakan Alakoca and Mehmet Akif Durmaz},
doi = {10.1109/ELECO.2015.7394639},
isbn = {9786050107371},
year = {2016},
date = {2016-01-01},
booktitle = {ELECO 2015 - 9th International Conference on Electrical and Electronics Engineering},
abstract = {textcopyright 2015 Chamber of Electrical Engineers of Turkey. In this study, real-time software defined radio implementation of the point to point multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) system using pre-fast Fourier transform (pre-FFT) beamforming technique in both the transmitter and the receiver is done for the first time in the literature. By taking benefit of the MIMO system's spatial multiplexing property, the performance of the implemented pre-FFT beamforming approach is demonstrated in terms of bit error rate and error vector magnitude measurements. As a result of the test results, the effect of the beamforming methods on the performance of communication systems are clearly observed.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
textcopyright 2015 Chamber of Electrical Engineers of Turkey. In this study, real-time software defined radio implementation of the point to point multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) system using pre-fast Fourier transform (pre-FFT) beamforming technique in both the transmitter and the receiver is done for the first time in the literature. By taking benefit of the MIMO system's spatial multiplexing property, the performance of the implemented pre-FFT beamforming approach is demonstrated in terms of bit error rate and error vector magnitude measurements. As a result of the test results, the effect of the beamforming methods on the performance of communication systems are clearly observed. |
Aydogmus, Yigitcan; Ozbek, Berna; Koyuncu, Onur; Ulusoy, Kazim; Karakaya, Ozgur Flow based power efficient routing for software defined networks Inproceedings 2016. Abstract | Links | BibTeX @inproceedings{Aydogmus2016,
title = {Flow based power efficient routing for software defined networks},
author = {Yigitcan Aydogmus and Berna Ozbek and Onur Koyuncu and Kazim Ulusoy and Ozgur Karakaya},
doi = {10.1109/siu.2016.7495778},
year = {2016},
date = {2016-01-01},
abstract = {Since traffic diversity and volume increase with growing popularity of mobile applications, there is the strong need to manage the traffic carried by networks. Software defined networking can manage network while enabling new services by employing traffic management whose goal is to maximize the utility objective while satisfying given requirements. In this paper, we propose an efficient routing to minimize the cost based on power consumption determined by the number of active switches in a software defined networks. An optimum solution obtained by genetic algorithm and a reduced complexity routing approach are proposed while satisfying throughput requirements of flows for given constraints on link capacities in the network. We provide the performance evaluations of the proposed algorithms with respect to different throughput constraints of flows in a given network topology.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Since traffic diversity and volume increase with growing popularity of mobile applications, there is the strong need to manage the traffic carried by networks. Software defined networking can manage network while enabling new services by employing traffic management whose goal is to maximize the utility objective while satisfying given requirements. In this paper, we propose an efficient routing to minimize the cost based on power consumption determined by the number of active switches in a software defined networks. An optimum solution obtained by genetic algorithm and a reduced complexity routing approach are proposed while satisfying throughput requirements of flows for given constraints on link capacities in the network. We provide the performance evaluations of the proposed algorithms with respect to different throughput constraints of flows in a given network topology. |
Ozbek, Berna; Aydogmus, Yigitcan; Ulas, Aydin; Gorkemli, Burak; Ulusoy, Kazim Energy aware routing and traffic management for software defined networks Inproceedings IEEE NETSOFT 2016 - 2016 IEEE NetSoft Conference and Workshops: Software-Defined Infrastructure for Networks, Clouds, IoT and Services, 2016, ISBN: 9781467394864. Abstract | Links | BibTeX @inproceedings{Ozbek2016b,
title = {Energy aware routing and traffic management for software defined networks},
author = {Berna Ozbek and Yigitcan Aydogmus and Aydin Ulas and Burak Gorkemli and Kazim Ulusoy},
doi = {10.1109/NETSOFT.2016.7502446},
isbn = {9781467394864},
year = {2016},
date = {2016-01-01},
booktitle = {IEEE NETSOFT 2016 - 2016 IEEE NetSoft Conference and Workshops: Software-Defined Infrastructure for Networks, Clouds, IoT and Services},
abstract = {textcopyright 2016 IEEE. Since traffic diversity and volume increase with growing popularity of mobile applications, there is the strong need to manage the traffic carried by networks. Software defined networks can simplify network management while enabling new services by employing traffic management including routing whose goal is to maximize the given utility while satisfying capacity requirements. In this paper, we propose an efficient routing algorithm to minimize the cost based on power consumption determined by the number of active OpenFlow switches in a software defined network while satisfying throughput requirements of all flows according to constraints on link capacities in the network. We evaluate the performance of the proposed algorithm based on the number of active switches for different network topologies with various scenarios.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
textcopyright 2016 IEEE. Since traffic diversity and volume increase with growing popularity of mobile applications, there is the strong need to manage the traffic carried by networks. Software defined networks can simplify network management while enabling new services by employing traffic management including routing whose goal is to maximize the given utility while satisfying capacity requirements. In this paper, we propose an efficient routing algorithm to minimize the cost based on power consumption determined by the number of active OpenFlow switches in a software defined network while satisfying throughput requirements of all flows according to constraints on link capacities in the network. We evaluate the performance of the proposed algorithm based on the number of active switches for different network topologies with various scenarios. |
Baştürk, Ilhan; Özbek, Berna Resource allocation for user-relay assisted MISO-OFDMA networks Inproceedings Proceedings of the International Symposium on Wireless Communication Systems, 2015, ISSN: 21540225. Links | BibTeX @inproceedings{Basturk2015,
title = {Resource allocation for user-relay assisted MISO-OFDMA networks},
author = {Ilhan Baştürk and Berna Özbek},
doi = {10.1109/ISWCS.2015.7454312},
issn = {21540225},
year = {2015},
date = {2015-01-01},
booktitle = {Proceedings of the International Symposium on Wireless Communication Systems},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Durbas, Sukru; Ozbek, Berna Energy-efficient resource allocation for multiuser OFDM wireless networks Inproceedings 2015. Links | BibTeX @inproceedings{Durbas2015,
title = {Energy-efficient resource allocation for multiuser OFDM wireless networks},
author = {Sukru Durbas and Berna Ozbek},
doi = {10.1109/siu.2015.7129998},
year = {2015},
date = {2015-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Aycan, Esra; Özbek, Berna; Ruyet, Didier Le Improved successive stream selection with quantized channel in heterogeneous networks Inproceedings Proceedings of the International Symposium on Wireless Communication Systems, 2015, ISSN: 21540225. Links | BibTeX @inproceedings{Aycan2015,
title = {Improved successive stream selection with quantized channel in heterogeneous networks},
author = {Esra Aycan and Berna Özbek and Didier Le Ruyet},
doi = {10.1109/ISWCS.2015.7454418},
issn = {21540225},
year = {2015},
date = {2015-01-01},
booktitle = {Proceedings of the International Symposium on Wireless Communication Systems},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Basturk, Ilhan; Ozbek, Berna Effect Of mobile relays on the OFDMA-based cellular network performance Inproceedings 2014. Links | BibTeX @inproceedings{Basturk2014,
title = {Effect Of mobile relays on the OFDMA-based cellular network performance},
author = {Ilhan Basturk and Berna Ozbek},
doi = {10.1109/siu.2014.6830234},
year = {2014},
date = {2014-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le; Pischella, Mylene Sum capacity maximization in distributed multicell MISO-OFDMA systems with reduced feedback links Inproceedings 2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings, 2014, ISBN: 9781479958634. Links | BibTeX @inproceedings{Ozbek2014j,
title = {Sum capacity maximization in distributed multicell MISO-OFDMA systems with reduced feedback links},
author = {Berna Özbek and Didier Le Ruyet and Mylene Pischella},
doi = {10.1109/ISWCS.2014.6933407},
isbn = {9781479958634},
year = {2014},
date = {2014-01-01},
booktitle = {2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ruyet, Didier Le; Zakaria, Rostom; Özbek, Berna On precoding MIMO-FBMC with imperfect channel state information at the transmitter Inproceedings 2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings, 2014, ISBN: 9781479958634. Links | BibTeX @inproceedings{LeRuyet2014,
title = {On precoding MIMO-FBMC with imperfect channel state information at the transmitter},
author = {Didier Le Ruyet and Rostom Zakaria and Berna Özbek},
doi = {10.1109/ISWCS.2014.6933464},
isbn = {9781479958634},
year = {2014},
date = {2014-01-01},
booktitle = {2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Aycan, Esra; Özbek, Berna; Ruyet, Didier Le Hierarchical successive stream selection for heterogeneous network interference Inproceedings IEEE Wireless Communications and Networking Conference, WCNC, 2014, ISSN: 15253511. Links | BibTeX @inproceedings{Aycan2014,
title = {Hierarchical successive stream selection for heterogeneous network interference},
author = {Esra Aycan and Berna Özbek and Didier Le Ruyet},
doi = {10.1109/WCNC.2014.6952290},
issn = {15253511},
year = {2014},
date = {2014-01-01},
booktitle = {IEEE Wireless Communications and Networking Conference, WCNC},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Başturk, Ilhan; Özbek, Berna; Edemen, Caǧatay; Tan, Ahmet Serdar; Zeydan, Engin; Ergüt, Salih Radio resource management for OFDMA-based mobile relay enhanced heterogenous cellular networks Inproceedings IEEE Vehicular Technology Conference, 2013, ISSN: 15502252. Abstract | Links | BibTeX @inproceedings{Basturk2013,
title = {Radio resource management for OFDMA-based mobile relay enhanced heterogenous cellular networks},
author = {Ilhan Başturk and Berna Özbek and Caǧatay Edemen and Ahmet Serdar Tan and Engin Zeydan and Salih Ergüt},
doi = {10.1109/VTCSpring.2013.6692729},
issn = {15502252},
year = {2013},
date = {2013-01-01},
booktitle = {IEEE Vehicular Technology Conference},
abstract = {In this paper, we focus on the radio resource management problem for the Orthogonal Frequency Division Multiple Access (OFDMA)-based mobile relay-enhanced het erogenous cellular networks. We combine mobile relaying and data offloading scenarios to increase the capacity of the system and cope with the mobile data traffic volume that is increased by the number of wireless subscribers accessing mobile data services. We propose network interface selection, relay selection and resource allocation solutions for this scenario and show effect of relaying and data offloading on the system capacity and on the ratio of satisfied users. textcopyright 2013 IEEE.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
In this paper, we focus on the radio resource management problem for the Orthogonal Frequency Division Multiple Access (OFDMA)-based mobile relay-enhanced het erogenous cellular networks. We combine mobile relaying and data offloading scenarios to increase the capacity of the system and cope with the mobile data traffic volume that is increased by the number of wireless subscribers accessing mobile data services. We propose network interface selection, relay selection and resource allocation solutions for this scenario and show effect of relaying and data offloading on the system capacity and on the ratio of satisfied users. textcopyright 2013 IEEE. |
Özbek, Berna; Ruyet, Didier Le; Pischella, Mylene Reduced feedback links for power minimization in distributed multicell OFDMA networks Inproceedings IEEE International Conference on Communications, 2012, ISSN: 15503607. Abstract | Links | BibTeX @inproceedings{Ozbek2012c,
title = {Reduced feedback links for power minimization in distributed multicell OFDMA networks},
author = {Berna Özbek and Didier Le Ruyet and Mylene Pischella},
doi = {10.1109/ICC.2012.6363962},
issn = {15503607},
year = {2012},
date = {2012-01-01},
booktitle = {IEEE International Conference on Communications},
abstract = {In the next generation of multicell networks, adaptive resource allocation techniques will play an important role to improve both quality of service and spectral efficiency. In order to employ distributed power allocation for multicell Orthogonal Frequency-Division Multiple Access (OFDMA) networks, the channel state information (CSI) belonging to all users is required to share among base stations. However, the amount of feedback increases with the number of users, base stations and subcarriers. Therefore, it is important to perform a selection at the user side for multicell networks. In this paper, we propose reduced feedback links by choosing the users based on their approximate signal to interference noise ratio (SINR). The performance of the reduced feedback links are illustrated in multicell OFDMA systems.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
In the next generation of multicell networks, adaptive resource allocation techniques will play an important role to improve both quality of service and spectral efficiency. In order to employ distributed power allocation for multicell Orthogonal Frequency-Division Multiple Access (OFDMA) networks, the channel state information (CSI) belonging to all users is required to share among base stations. However, the amount of feedback increases with the number of users, base stations and subcarriers. Therefore, it is important to perform a selection at the user side for multicell networks. In this paper, we propose reduced feedback links by choosing the users based on their approximate signal to interference noise ratio (SINR). The performance of the reduced feedback links are illustrated in multicell OFDMA systems. |
Aycan, Esra; Ozbek, Berna Performance of cell selection algorithms in wireless networks Inproceedings 2012. Links | BibTeX @inproceedings{Aycan2012,
title = {Performance of cell selection algorithms in wireless networks},
author = {Esra Aycan and Berna Ozbek},
doi = {10.1109/siu.2012.6204720},
year = {2012},
date = {2012-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le Adaptive reduced feedback for fair user scheduling in MISO-OFDMA systems Inproceedings IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 2012, ISBN: 9781467309714. Links | BibTeX @inproceedings{Ozbek2012b,
title = {Adaptive reduced feedback for fair user scheduling in MISO-OFDMA systems},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1109/SPAWC.2012.6292912},
isbn = {9781467309714},
year = {2012},
date = {2012-01-01},
booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Baştürk, Ilhan; Özbek, Berna Fairness aware resource allocation for downlink MISO-OFDMA systems Inproceedings IEEE Wireless Communications and Networking Conference, WCNC, 2012, ISSN: 15253511. Links | BibTeX @inproceedings{Basturk2012,
title = {Fairness aware resource allocation for downlink MISO-OFDMA systems},
author = {Ilhan Baştürk and Berna Özbek},
doi = {10.1109/WCNC.2012.6214094},
issn = {15253511},
year = {2012},
date = {2012-01-01},
booktitle = {IEEE Wireless Communications and Networking Conference, WCNC},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le Adaptive bit partitioning strategy for cell-edge users in multi-antenna multicell networks Inproceedings IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 2011, ISBN: 9781424493326. Abstract | Links | BibTeX @inproceedings{Ozbek2011b,
title = {Adaptive bit partitioning strategy for cell-edge users in multi-antenna multicell networks},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1109/SPAWC.2011.5990451},
isbn = {9781424493326},
year = {2011},
date = {2011-01-01},
booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC},
abstract = {In this paper, we improve the performance of cell-edge users by applying adaptive bit partitioning for intercell interference cancelation in cooperative downlink multicell systems. The strategy for partitioning quantization bits between serving and interfering base stations affects the performance of the cooperative networks which is quite sensitive to the quality of the channel state information. The existing transmission strategies are based on the maximization of average cell rate which results in a reduced rate for the users in the cell-edge regions. We propose an adaptive bit partitioning strategy to improve the rate of cell-edge users at the same average feedback link rate. We show the performance of the cell-edge users is significantly increased while keeping the same average cell rate.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
In this paper, we improve the performance of cell-edge users by applying adaptive bit partitioning for intercell interference cancelation in cooperative downlink multicell systems. The strategy for partitioning quantization bits between serving and interfering base stations affects the performance of the cooperative networks which is quite sensitive to the quality of the channel state information. The existing transmission strategies are based on the maximization of average cell rate which results in a reduced rate for the users in the cell-edge regions. We propose an adaptive bit partitioning strategy to improve the rate of cell-edge users at the same average feedback link rate. We show the performance of the cell-edge users is significantly increased while keeping the same average cell rate. |
Basturk, Ilhan; Ozbek, Berna Fair resource allocation for multi-useR MISO-OFDMA systems Inproceedings 2011. Links | BibTeX @inproceedings{Basturk2011,
title = {Fair resource allocation for multi-useR MISO-OFDMA systems},
author = {Ilhan Basturk and Berna Ozbek},
doi = {10.1109/siu.2011.5929698},
year = {2011},
date = {2011-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Aycan, Esra; Ozbek, Berna Capacity performances of home base stations with multiple antennas in indoor environment Inproceedings 2011. Links | BibTeX @inproceedings{Aycan2011a,
title = {Capacity performances of home base stations with multiple antennas in indoor environment},
author = {Esra Aycan and Berna Ozbek},
doi = {10.1109/siu.2011.5929700},
year = {2011},
date = {2011-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ustok, Refik Fatih; Ozbek, Berna Spectrum sensing based on cyclostationary feature detection for cognitive radios with multiple antennas Inproceedings 2011. Links | BibTeX @inproceedings{Ustok2011,
title = {Spectrum sensing based on cyclostationary feature detection for cognitive radios with multiple antennas},
author = {Refik Fatih Ustok and Berna Ozbek},
doi = {10.1109/siu.2011.5929709},
year = {2011},
date = {2011-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le Adaptive limited feedback for intercell interference cancelation in cooperative downlink multicell networks Inproceedings Proceedings of the 2010 7th International Symposium on Wireless Communication Systems, ISWCS'10, 2010, ISBN: 9781424463169. Links | BibTeX @inproceedings{Ozbek2010a,
title = {Adaptive limited feedback for intercell interference cancelation in cooperative downlink multicell networks},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1109/ISWCS.2010.5624536},
isbn = {9781424463169},
year = {2010},
date = {2010-01-01},
booktitle = {Proceedings of the 2010 7th International Symposium on Wireless Communication Systems, ISWCS'10},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le Reduced feedback designs for SDMA-OFDMA systems Inproceedings IEEE International Conference on Communications, 2009, ISSN: 05361486. Links | BibTeX @inproceedings{Ozbek2009ab,
title = {Reduced feedback designs for SDMA-OFDMA systems},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1109/ICC.2009.5199400},
issn = {05361486},
year = {2009},
date = {2009-01-01},
booktitle = {IEEE International Conference on Communications},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ustok, Refik Fatih; Ozbek, Berna Spectrum sensing based on energy detection for Cognitive Radio systems with multiple antennas Inproceedings 2009. Links | BibTeX @inproceedings{Ustok2009,
title = {Spectrum sensing based on energy detection for Cognitive Radio systems with multiple antennas},
author = {Refik Fatih Ustok and Berna Ozbek},
doi = {10.1109/siu.2009.5136416},
year = {2009},
date = {2009-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le Adaptive resource allocation for SDMA-OFDMA systems with genetic algorithm Inproceedings Proceedings of the 2009 6th International Symposium on Wireless Communication Systems, ISWCS'09, 2009, ISBN: 9781424435845. Links | BibTeX @inproceedings{Ozbek2009c,
title = {Adaptive resource allocation for SDMA-OFDMA systems with genetic algorithm},
author = {Berna Özbek and Didier Le Ruyet},
doi = {10.1109/ISWCS.2009.5285288},
isbn = {9781424435845},
year = {2009},
date = {2009-01-01},
booktitle = {Proceedings of the 2009 6th International Symposium on Wireless Communication Systems, ISWCS'09},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Baştürk, Ilhan; ÖZbek, Berna Iterative EM-based channel estimation for STBC-OFDM Inproceedings IEEE Wireless Communications and Networking Conference, WCNC, 2009, ISSN: 15253511. Links | BibTeX @inproceedings{Basturk2009,
title = {Iterative EM-based channel estimation for STBC-OFDM},
author = {Ilhan Baştürk and Berna ÖZbek},
doi = {10.1109/WCNC.2009.4917765},
issn = {15253511},
year = {2009},
date = {2009-01-01},
booktitle = {IEEE Wireless Communications and Networking Conference, WCNC},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Baştürk, Ilhan; ÖZbek, Berna Iterative EM-based channel estimation for STBC-OFDM Inproceedings IEEE Wireless Communications and Networking Conference, WCNC, 2009, ISSN: 15253511. Links | BibTeX @inproceedings{Basturk2009b,
title = {Iterative EM-based channel estimation for STBC-OFDM},
author = {Ilhan Baştürk and Berna ÖZbek},
doi = {10.1109/WCNC.2009.4917765},
issn = {15253511},
year = {2009},
date = {2009-01-01},
booktitle = {IEEE Wireless Communications and Networking Conference, WCNC},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Basturk, Ilhan; Ozbek, Berna Performance of EM-based channel estimation for STBC-OFDM systems Inproceedings 2009. Links | BibTeX @inproceedings{Basturk2009a,
title = {Performance of EM-based channel estimation for STBC-OFDM systems},
author = {Ilhan Basturk and Berna Ozbek},
doi = {10.1109/siu.2009.5136338},
year = {2009},
date = {2009-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ozbek, Berna; Ruyet, Didier Le Transmit beamforming techniques for multicast wireless communication systems Inproceedings 2009. Links | BibTeX @inproceedings{Ozbek2009b,
title = {Transmit beamforming techniques for multicast wireless communication systems},
author = {Berna Ozbek and Didier Le Ruyet},
doi = {10.1109/siu.2009.5136377},
year = {2009},
date = {2009-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ruyet, Didier Le; Khanfir, Hajer; Özbek, Berna Performance of semi-orthogonal user selection for multiuser MISO systems Inproceedings IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 2008. Abstract | Links | BibTeX @inproceedings{LeRuyet2008,
title = {Performance of semi-orthogonal user selection for multiuser MISO systems},
author = {Didier Le Ruyet and Hajer Khanfir and Berna Özbek},
doi = {10.1109/SPAWC.2008.4641622},
year = {2008},
date = {2008-01-01},
booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC},
abstract = {For MISO multiuser downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state information at$backslash$nthe transmitter can provide tremendous capacity gains. However,$backslash$nthe amount of feedback data increases with the number of users in$backslash$nthe cell and the number of transmit antennas. In this paper, we$backslash$nstudy the performance of different user selection algorithms at$backslash$nthe receiver side through the noisy uplink channel. We evaluate$backslash$nthe effect of the noisy channel on the classical norm criterion$backslash$nwith a criterion based on the orthogonality between the user$backslash$nchannels. Without cooperation between the users, we only allow$backslash$nusers that are semi-orthogonal to feedback their channel$backslash$ninformation as analog and quantized information to the base$backslash$nstation through the noisy uplink channel. We propose an algorithm$backslash$nto reduce the noise effect on the analog feedback for$backslash$nsemi-orthogonal user selection algorithm. We show that the$backslash$nsemi-orthogonal criterion with quantized feedback gives a better$backslash$nperformance compared to the norm criterion for perfect and noisy$backslash$nuplink channels.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
For MISO multiuser downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state information at$backslash$nthe transmitter can provide tremendous capacity gains. However,$backslash$nthe amount of feedback data increases with the number of users in$backslash$nthe cell and the number of transmit antennas. In this paper, we$backslash$nstudy the performance of different user selection algorithms at$backslash$nthe receiver side through the noisy uplink channel. We evaluate$backslash$nthe effect of the noisy channel on the classical norm criterion$backslash$nwith a criterion based on the orthogonality between the user$backslash$nchannels. Without cooperation between the users, we only allow$backslash$nusers that are semi-orthogonal to feedback their channel$backslash$ninformation as analog and quantized information to the base$backslash$nstation through the noisy uplink channel. We propose an algorithm$backslash$nto reduce the noise effect on the analog feedback for$backslash$nsemi-orthogonal user selection algorithm. We show that the$backslash$nsemi-orthogonal criterion with quantized feedback gives a better$backslash$nperformance compared to the norm criterion for perfect and noisy$backslash$nuplink channels. |
Ozbek, Berna; Ruyet, Didier Le Sum-rate maximized adaptive subcarrier and bit allocation for multiuser OFDM systems with genetic algorithm Inproceedings 2008. Links | BibTeX @inproceedings{Ozbek2008a,
title = {Sum-rate maximized adaptive subcarrier and bit allocation for multiuser OFDM systems with genetic algorithm},
author = {Berna Ozbek and Didier Le Ruyet},
doi = {10.1109/siu.2008.4632674},
year = {2008},
date = {2008-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Khanfir, Hajer; Ruyet, Didier Le; Özbek, Berna Semi-orthogonal user selection for MISO systems with quantized feedback Inproceedings 2008 International ITG Workshop on Smart Antennas, WSA 2008, 2008, ISBN: 9781424417575. Abstract | Links | BibTeX @inproceedings{Khanfir2008,
title = {Semi-orthogonal user selection for MISO systems with quantized feedback},
author = {Hajer Khanfir and Didier Le Ruyet and Berna Özbek},
doi = {10.1109/WSA.2008.4475554},
isbn = {9781424417575},
year = {2008},
date = {2008-01-01},
booktitle = {2008 International ITG Workshop on Smart Antennas, WSA 2008},
abstract = {For MISO multi-users downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state of information at$backslash$nthe transmitter can provide tremendous capacity gains. However, the$backslash$namount of feedback data increase with the users number in the cell$backslash$nand the number of transmit antennas. In this paper, we study$backslash$ndifferent algorithms and criteria in order to significantly$backslash$nreduced the amount of feedback data. We associate the classical norm$backslash$ncriterion with a criterion based on the orthogonality between the user$backslash$nchannels. Without$backslash$ncooperation between the users, we only allow users that are$backslash$northogonal to feedback their channel information (CQI and CDI) to$backslash$nthe base station. The feedbacked CDI is quantized using a local$backslash$ngrassmanian packing . We show that the proposed combined$backslash$ncriterion with a finite feedback rate gives better performance compared$backslash$nto the norm criterion.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
For MISO multi-users downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state of information at$backslash$nthe transmitter can provide tremendous capacity gains. However, the$backslash$namount of feedback data increase with the users number in the cell$backslash$nand the number of transmit antennas. In this paper, we study$backslash$ndifferent algorithms and criteria in order to significantly$backslash$nreduced the amount of feedback data. We associate the classical norm$backslash$ncriterion with a criterion based on the orthogonality between the user$backslash$nchannels. Without$backslash$ncooperation between the users, we only allow users that are$backslash$northogonal to feedback their channel information (CQI and CDI) to$backslash$nthe base station. The feedbacked CDI is quantized using a local$backslash$ngrassmanian packing . We show that the proposed combined$backslash$ncriterion with a finite feedback rate gives better performance compared$backslash$nto the norm criterion. |
Basturk, Ilhan; Ozbek, Berna Pilot-based iterative channel estimation for OFDM systems Inproceedings 2008. Links | BibTeX @inproceedings{Basturk2008,
title = {Pilot-based iterative channel estimation for OFDM systems},
author = {Ilhan Basturk and Berna Ozbek},
doi = {10.1109/siu.2008.4632584},
year = {2008},
date = {2008-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Ruyet, Didier Le; Özbek, Berna Partial and analog feedback for MISO precoding systems Inproceedings IEEE International Conference on Communications, 2007, ISSN: 05361486. Links | BibTeX @inproceedings{LeRuyet2007,
title = {Partial and analog feedback for MISO precoding systems},
author = {Didier Le Ruyet and Berna Özbek},
doi = {10.1109/ICC.2007.460},
issn = {05361486},
year = {2007},
date = {2007-01-01},
booktitle = {IEEE International Conference on Communications},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Basturk, Ilhan; Ozbek, Berna Performance of Pilot-Based EM Channel Estimation for OFDM Systems Inproceedings 2007. Links | BibTeX @inproceedings{Basturk2007,
title = {Performance of Pilot-Based EM Channel Estimation for OFDM Systems},
author = {Ilhan Basturk and Berna Ozbek},
doi = {10.1109/siu.2007.4298631},
year = {2007},
date = {2007-01-01},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Özbek, Berna; Ruyet, Didier Le; Khiari, Hajer Adaptive resource allocation for multicast OFDM systems with multiple transmit antennas Inproceedings IEEE International Conference on Communications, 2006, ISSN: 05361486. Links | BibTeX @inproceedings{Ozbek2006,
title = {Adaptive resource allocation for multicast OFDM systems with multiple transmit antennas},
author = {Berna Özbek and Didier Le Ruyet and Hajer Khiari},
doi = {10.1109/ICC.2006.255332},
issn = {05361486},
year = {2006},
date = {2006-01-01},
booktitle = {IEEE International Conference on Communications},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
|
Miscellaneous
|
Özbek, Berna; Karataş, Azad; Bardak, Erinc Deniz; Sönmez, İlker Traffic aware cell selection algorithm for Tetra Trunk based professional mobile radio Miscellaneous 2019, ISSN: 15729451. Abstract | Links | BibTeX @misc{Ozbek2019,
title = {Traffic aware cell selection algorithm for Tetra Trunk based professional mobile radio},
author = {Berna Özbek and Azad Karataş and Erinc Deniz Bardak and İlker Sönmez},
doi = {10.1007/s11235-018-00540-w},
issn = {15729451},
year = {2019},
date = {2019-01-01},
booktitle = {Telecommunication Systems},
abstract = {Load balancing and traffic management are the critical needs in cell selection decision for a better and seamless communication demands in professional mobile radios. For the cases where cell selection algorithms do not consider the traffic load, there may be call drops due to the congestion in networks or longer call setup times for the users. These undesired consequences can cause dramatic quality degradation especially for the emergency cases or public safety services. In this paper, we propose two algorithms for Tetra Trunk based professional mobile radios by considering both traffic load and received signal strength indication (RSSI) in order to reduce the significant delays while establishing transmissions. The proposed full set cell selection algorithm is prioritized to reduce the call setup time for the mobile users and the proposed reduced set cell selection algorithm is focused on minimizing the number of RSSI measurements which causes significant delay in practical professional mobile radio. We illustrate the performance results in terms of delay for Tetra Trunk based professional mobile radio.},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
Load balancing and traffic management are the critical needs in cell selection decision for a better and seamless communication demands in professional mobile radios. For the cases where cell selection algorithms do not consider the traffic load, there may be call drops due to the congestion in networks or longer call setup times for the users. These undesired consequences can cause dramatic quality degradation especially for the emergency cases or public safety services. In this paper, we propose two algorithms for Tetra Trunk based professional mobile radios by considering both traffic load and received signal strength indication (RSSI) in order to reduce the significant delays while establishing transmissions. The proposed full set cell selection algorithm is prioritized to reduce the call setup time for the mobile users and the proposed reduced set cell selection algorithm is focused on minimizing the number of RSSI measurements which causes significant delay in practical professional mobile radio. We illustrate the performance results in terms of delay for Tetra Trunk based professional mobile radio. |
Ozbek, Berna; Pischella, Mylene; Ruyet, Didier Le Dynamic Shared Spectrum Allocation for Underlaying Device-to-Device Communications Miscellaneous 2017, ISSN: 15361284. Links | BibTeX @misc{Ozbek2017b,
title = {Dynamic Shared Spectrum Allocation for Underlaying Device-to-Device Communications},
author = {Berna Ozbek and Mylene Pischella and Didier Le Ruyet},
doi = {10.1109/MWC.2017.1700064},
issn = {15361284},
year = {2017},
date = {2017-01-01},
booktitle = {IEEE Wireless Communications},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
|
