Cognitive Relay Networks

Cognitive Realy Networks

Cognitive radio (CR) has attracted much attention due to alleviating inefficient scarce spectrum resources utilization. In the underlay approach, communication between secondary users (SUs) is acceptable in the presence of primary users (Pus) over the same spectrum while the induced aggregate interference on primary receivers is below the predefined tolerable interference temperature. In this Project, we adapt the underlay approach due to its advantages from an implementation point of view. Also, immense potential of cooperative communication to solve the problem of low power transmission and short coverage in underlay paradigm due to interference constraint has attracted great deal of attention. Recently distributed relay beamforming has tremendous capability to alleviate interference using adjustable power in relays. In order to further increase the spectrum efficiency in underlay cognitive relay networks (CRNs) and from practical viewpoint, two-way relaying can be applied. Motivated by beamforming and two-way relaying in CRNs, we propose a novel framework based on beamforming for this network.

Publications:

S.H. Safavi , M. Ardebilipour and S. Salari, “Relay beamforming in cognitive two-way networks with imperfect channel state information,” IEEE Wireless Communications Letters, vol. 1, no. 4, pp.344-347, Aug. 2012. [PDF] [DOI] [Code]
S.H. Safavi , R. Sadegh Zadeh, V. Jamali and S. Salari,"Interference Minimization Approach for Distributed Beamforming in Cognitive Two-Way Relay Networks," IEEE Pacific Rim Conference on Communications,Computers and Signal Processing, Victoria, Canada, 2011. pp. 352-356. [PDF] [DOI] [Code]
S.H. Safavi , M. Ardebilipour, V. Jamali and J. M. Ahmadian, "Distributed Beamforming for SINR Balancing Approach in Cognitive Two-Way Relay Networks With Imperfect Channel State Information," Iranian Conference on Electrical Engineering (ICEE 2012), Tehran, Iran, 2012. pp. 1342-1346. [PDF] [DOI] [Code]
S.H. Safavi , M. Ardebilipour, R. Sadegh Zadeh, and A. Piltan, "SINR Balancing Approach for Network Beamforming in Cognitive Two-Way Relay Networks," 11th International Conference on Hybrid Intelligent Systems. (HIS 2011), Malaca, Malaysia, 2011.pp. 481-485. [PDF] [DOI] [Code]