Browsing by Author "Özbek, Berna"

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 load based user association for professional mobile radio systems

Yılmaz, Saadet Simay; Özbek, Berna; Taş, Murat; Bengür, Sıdıka (Institute of Electrical and Electronics Engineers, 2018)

When the public communication networks can not provide service during disaster and high traffic cases, Professional Mobile Radio systems (PMR) such as trunked Digital Mobile Radio (DMR) systems are needed to improve the ...

Cell load based user association for TETRA trunk systems

Karataş, Azad; Özbek, Berna; Bardak, Erinç Deniz; Sönmez, İlker (Institute of Electrical and Electronics Engineers, 2018)

Increasing traffic in communication systems need efficient new cell selection algorithms to control the distribution of users. For better and seamless transmission, load balancing become critical factors for cell selection ...

Cell selection algorithms for conventional narrow band wireless systems

Yılmaz, Saadet Simay (Izmir Institute of Technology, 2017-07)

Public safety organizations provide a stable and secure environment for the society. Wireless communication between public safety officers is very important to transmit voice or data during an emergency crisis. When the ...

Cell selection algorithms for terrestrial trunked narrow band radio systems

Karataş, Azad (Izmir Institute of Technology, 2017-07)

Since the interest in mobile communication sector is increasing day by day, it makes traffic volume problem more important. There are different works focused on developing more secure and qualified service for professional ...

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 ...

Channel and queue aware joint relay selection and resource allocation for MISO-OFDMA based user-relay assisted cellular networks

Baştürk, İlhan; Özbek, Berna (Springer, 2018-04)

User-relay assisted orthogonal frequency division multiple access (OFDMA) networks are cost-effective solutions to meet the growing capacity and coverage demands of the next generation cellular networks. These networks can ...