Research on Selection Cooperation Diversity Based on Outdated Feedback
Zhao Yong-ch · Jisuanji gongcheng · 2014
Due to characteristics of time-varying channel in the wireless cooperative communication system,the Channel State Information(CSI)at the time of relay selection may be different from that at the time of data transmission. Aiming at this problem,the selection cooperation with outdated feedback is investigated in this paper. First,the system model and the relay selection process with outdated feedback are introduced,and the closed-form result of outage probability and closed approximation in the high SNR regime are derived. By analyzing Diversity-multiplexing Tradeoff(DMT),it obtains the maximum diversity order which is 2 when the CSI used in relay selection is outdated. Finally,numerical simulation results verify the correctness of theoretical analysis,and show the outage performance will be greatly reduced when the CSI at the time of relay selection is slightly different form it at the time of data transmission.