Cooperative Beamforming in Relay Assisted MIMO-OFDMA Cognitive Radio Systems
Publish place: Journal of Electrical Systems and Signals، Vol: 1، Issue: 2
Publish Year: 1392
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JESS-1-2_004
تاریخ نمایه سازی: 19 شهریور 1396
Abstract:
In this paper, a new algorithm is proposed for cooperative beamforming, power allocation and relay selection in the multiple input multiple output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) CR systems where a pair of SU communicates with each other assisted by some single antenna relay nodes. The objective is to maximize signal to interference plus noise ratio (SINR) of SU subject to guarantee the PU s quality of service and power constraints of SU and relay nodes over all subchannels. The transmitter and receiver beamforming vectors of PU and SU are estimated by the proposed twostep iterative algorithm. Simulation results show that the proposed algorithm is able to increase the spectrum usage efficiency and, further, guarantee the required QOS at the PU.
Keywords:
Relay assisted MIMO-OFDMA cognitive radio , cooperative beamforming , power allocation , relay selection
Authors
Mohsen Abbasi-Jannatabad
The authors are with the Department of Electrical Engineering, Ferdousi University of Mashhad (FUM), Mashhad, Iran.
Hossein Khoshbin
This research has been done at Commonications and Computer Research Center of FUM.