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Browsing by Author "Özbek, Berna"
Now showing items 1-20 of 66
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Adaptive bit partitioning strategy for cell-edge users in multi-antenna multicell networks
Özbek, Berna; Le Ruyet, Didier (IEEE, 2011)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 ... -
The adaptive channel estimation for STBC-OFDM systems
Özbek, Berna; Yılmaz, Reyat (University of Istanbul, 2005)In this paper, we propose adaptive channel estimation methods based on LMS and RLS for orthogonal STBC-OFDM systems with three transmit antennas. The performance of the proposed algorithms is obtained in the frequency ... -
Adaptive limited feedback for intercell interference cancelation in cooperative downlink multicell networks
Özbek, Berna; Le Ruyet, Didier (IEEE, 2010)In this paper, we evaluate intercell interference cancelation techniques in cooperative downlink multicell systems. We compare two classical beamforming strategies for the design of the beamforming vectors: maximum ratio ... -
Adaptive limited feedback links for cooperative multi-antenna multicell networks
Özbek, Berna; Ruyet, Didier Le (Springer, 2014)The overall performance of cooperative networks is quite sensitive to channel state information (CSI) of serving and interfering base stations (BSs) and affected strongly by quality of limited feedback links. In this paper, ... -
Adaptive limited feedback scheme for stream selection based interference alignment in heterogeneous networks
Aycan Beyazıt, Esra; Özbek, Berna; Le Ruyet, Didier (IEEE, 2016)This paper presents a stream selection based interference alignment approach with imperfect channel state information for heterogeneous networks. The proposed algorithm performs the selection of a stream sequence among a ... -
Adaptive reduced feedback links for distributed power allocation in multicell MISO-OFDMA networks
Özbek, Berna; Le Ruyet, Didier; Pischella, Mylene (IEEE Computer Society, 2014-04)For multi-antenna Orthogonal Frequency-Division Multiple Access (OFDMA) based multicell networks, the channel state information (CSI) of all users is required to share among base stations in order to perform distributed ... -
Adaptive resource allocation for multicast OFDM systems with multiple transmit antennas
Özbek, Berna; Le Ruyet, Didier; Khiari, Hajer (IEEE, 2006)We evaluate the impact of multiple transmit antennas on the performance of multicast OFDM systems by proposing a suboptimal low complexity algorithm. Associated with a powerful erasure code, it is possible to increase the ... -
Adaptive resource allocation for SDMA-OFDMA systems with genetic algorithm
Özbek, Berna; Le Ruyet, Didier (IEEE, 2009)In this paper, we propose an adaptive resource allocation algorithm to maximize the sum data rate for spatial division multiplexing access (SDMA) orthogonal division multiple access (OFDMA) systems using genetic algorithm. ... -
APCO25 için hücre seçim algoritmaları performansı
Yılmaz, Saadet Simay; Özbek, Berna; Taş, Murat; Bengür, Sıdıka (IEEE, 2016)Bu makalede, APCO25 telsiz sistemi için hücre seçim algoritmaları incelenmiştir. Hem baz istasyonlarının yükü hem de kullanıcıların sinyal karışım gürültü oranları göz önüne alınarak hücre seçimi gerçekleştirilmiştir. ... -
Breadth first algorithms for APP detectors over MIMO channels
Le Ruyet, Didier; Bertozzi, Tanya; Özbek, Berna (IEEE, 2004)For iterative decoding of multiple antenna systems concatenated with an outer error correcting code, it is important to use an a posteriori probability detector for the MIMO detection to achieve near capacity performance. ... -
Cell selection and interference coordination techniques for heterogeneous wireless networks
Mahmuda, Subaha (Izmir Institute of Technology, 2015-07)The rapid growth of traffic demands during past years, has led to the immense deployment of heterogeneous wireless networks consisting large-scale macro cells overlaid with multiple tiers of small cells. This is conceived ... -
DFBÇE tabanlı kablosuz ağlarda kullanıcı röleler için uzaklık bazlı seçim
Baştürk, İlhan; Özbek, Berna (IEEE, 2016)Düşük kurulum maliyetine ve geniş kapsama alanına sahip kullanıcı-rölelerle geliştirilmiş dikgen frekans bölmeli çoklu erişim (DFBÇE) tabanlı kablosuz ağlar, yüksek veri hızlarına iletişime olanak sağlamaları açısından ... -
Dynamic shared spectrum allocation for underlaying device-to-device communications
Özbek, Berna; Pischella, Mylene; Le Ruyet, Didier (IEEE, 2017-10)This article provides an overview on spectrum sharing in D2D underlaying communications for 5G and beyond 5G applications. Various spectrum sharing algorithms are summarized within a framework of underlaying D2D communications ... -
Energy aware routing and traffic management for software defined networks
Özbek, Berna; Aydoğmuş, Yiğitcan; Ulaş, Aydın; Görkemli, Burak; Ulusoy, Kazım (IEEE, 2016)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 ... -
Energy efficient resource allocation for underlaying multi-D2D enabled multiple-antennas communications
Özbek, Berna; Pischella, M.; Le Ruyet, Didier (Institute of Electrical and Electronics Engineers, 2020-06)Energy efficiency has a significant importance to optimize the wireless communications systems by providing high data rates. In order to develop energy efficient systems, one of the promising methods is to use multiple ... -
Fairness aware resource allocation for downlink MISO-OFDMA systems
Baştürk, İlhan; Özbek, Berna (IEEE, 2012)In this paper, a resource allocation problem for downlink multiple input-single output orthogonal frequency division multiple access (MISO-OFDMA) systems is investigated. The problem is defined as maximizing the minimum ... -
Güvenli çoklu kullanıcılı MISO sistemlerde eşik değerine dayalı kullanıcı seçim performansı
Özdoğan, Özgecan; Özbek, Berna; Karabulut Kurt, Güneş (IEEE, 2016)Fiziksel katmanda güvenlik metotları, telsiz ağların yapısından kaynaklanan güvenlik sorunlarının çözülmesi adına umut vaat etmektedir. Bu çalışmada, çoklu kullanıcılı çoklu antenli ve gizli dinleyici bulunduran bir sistem ... -
Heterojen ağlarda veri katarı seçimi tabanlı girişim hizalama için uyarlamalı sınırlı geri besleme yöntemi
Aycan Beyazıt, Esra; Özbek, Berna; Le Ruyet, Didier (IEEE, 2016)Bu bildiride, sınırlı geri beslemeli heterojen ağlar için veri katarı seçimi tabanlı bir girişim hizalama yöntemi sunulmuştur. Sunulan veri katarı seçimi yöntemi, veri katarlarını ilk olarak piko kullanıcılarından seçmeye ... -
Hierarchical successive stream selection for heterogeneous network interference
Aycan, Esra; Özbek, Berna; Le Ruyet, Didier (IEEE, 2014)This paper presents a hierarchical stream selection approach to deal with the interference in a heterogeneous network where different cell types are coexisting with each other to increase the sum capacity. Due to the variety ...
