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cooperative diversity - Alamouti signaling - selection decode-and-forward (SDF) - M-PSK - bit-error-rate (BER) |
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A bandwidth efficient two-user cooperative diversity system with limited feedback
LI Jing(1), GE JianHua(1), WANG Yong(1,2), TANG YunShuai(1), XIONG Xiong(1)
(1) State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an, 710071, China (2) State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, 100044, China
A two-user cooperative diversity system based on Alamouti signaling was proposed, which utilizes the orthogonal structure of Alamouti signaling to make cooperative users relay on the shared channel resources so that the spectral efficiency of the traditional cooperative system can be improved. When M-ary phase shift keying (M-PSK) modulation and an improved selection decode-and-forward (SDF) relaying protocol with limited feedback are used at the users and m(m ?1) receive antennas are configured at the base station, the average bit-error-rate (BER) system performance for statistically similar uplink channels was derived and it was verified by simulations. Under various channel scenarios of interest, numerical and simulation results show that the diversity gain achieved and the BER performance of the proposed system increase with the interuser channel quality, and the full transmit diversity order of two can be obtained for sufficiently high interuser signal-to-noise ratios (SNRs).