An Opportunistic Cooperation Scheme in Wireless Networks： When to Cooperate with the Relay？  

作　　者：ZOU Yulong ZHENG Baoyu ZHOU Liang 

机构地区：[1]Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China

出　　处：《Chinese Journal of Electronics》2009年第2期361-367,共7页电子学报（英文版）

基　　金：This work is supported by the Key Project of Natural Science Foundation of Jiangsu Province （No.BK2007729） and the Major Development Program of Jiangsu Educational Committee （No.06KJA51001）, the Postgraduate Innovation Program of Scientific Research of Jiangsu Province （No.CX08B_080Z）.

摘　　要：In the paper, an opportunistic cooperation scheme is proposed to make an efficient use of the cooperative relay, where whether the cooperative transmission will be adopted depends on the channel quality from the source to the relay, as opposed to the deterministic cooperation regardless of the relay channel conditions. Closedform expressions of the Bit error rate （BER） and the outage probability are derived over Rayleigh fading channels to evaluate the performance of the proposed cooperative diversity scheme. For the purpose of comparison, the performance of the coded cooperation is also analyzed, with numerical results justifying the merits of our opportunistic cooperation scheme. From the numerical results, the proposed opportunistic scheme outperforms the coded cooperation across the whole SNR range in terms of the BER and the outage probability and moreover, it is less sensitive to relay-destination channel conditions compared with the coded cooperation, further showing the superiority of our scheme.

关 键 词：Opportunistic cooperation Cooperative diversity Coded cooperation Outage probability. 

分 类 号：TN914.3[电子电信—通信与信息系统] P756.5[电子电信—信息与通信工程]