Improving amplify-and-forward relay selection algorithm based on partial relay link  

作　　者：WANG Fei-fei LIU Yuan-an LIN Xiao-feng XIE Gang 

机构地区：[1]Key Labomty of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2010年第1期56-61,共6页中国邮电高校学报（英文版）

基　　金：supported by Sino-Swedish IMT-Advanced Cooperation Project (2008DFA11780);Canada-China Scientific and Technological Cooperation,the National Natural Science Foundation of China (60802033,60873190);the Hi-Tech Research and Development Program of China (2008AA01Z211)

摘　　要：This article addresses the design problem of selecting an appropriate relay in amplify-and-forward （AF） cooperative diversity systems. In this regard, this article focuses on relay selection based on partial channel knowledge only across the source and relay links. In particular, the two fundamental questions will be answered, that is, whether to cooperate and whom to cooperate with. Through answering these two questions, an improved relay selection strategy based on partial relay link, which emphasizes that cooperation happens when necessary, is proposed to aim at maximizing the average mutual information. Then a joint optimization, in terms of power allocation and relay selection, is employed to guarantee a robust performance for relay selection based on partial relay link. Optimum power is allocated between the source and the selected relay to maximize the output signal-to-noise （SNR） at the destination. Simulation results turn out that the improved scheme can achieve better performance than previous work and the robust performance can be guaranteed by employing joint optimization.This article addresses the design problem of selecting an appropriate relay in amplify-and-forward （AF） cooperative diversity systems. In this regard, this article focuses on relay selection based on partial channel knowledge only across the source and relay links. In particular, the two fundamental questions will be answered, that is, whether to cooperate and whom to cooperate with. Through answering these two questions, an improved relay selection strategy based on partial relay link, which emphasizes that cooperation happens when necessary, is proposed to aim at maximizing the average mutual information. Then a joint optimization, in terms of power allocation and relay selection, is employed to guarantee a robust performance for relay selection based on partial relay link. Optimum power is allocated between the source and the selected relay to maximize the output signal-to-noise （SNR） at the destination. Simulation results turn out that the improved scheme can achieve better performance than previous work and the robust performance can be guaranteed by employing joint optimization.

关 键 词：cooperative diversity amplify-and-forward relay relay selection average mutual information 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TN929.52[自动化与计算机技术—计算机科学与技术]