Power control for two-way amplify-and-forward relaying over Rayleigh fading channels  

作　　者：Xing-zheng LI Yuan-an LIU Gang XIE Pan-liang DENG Fang LIU 

机构地区：[1]School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

出　　处：《Journal of Zhejiang University-Science C(Computers and Electronics)》2011年第4期280-287,共8页浙江大学学报C辑（计算机与电子（英文版）

基　　金：supported by the Sino-Swedish IMT-Advanced Cooperation Project (No.2008DFA11780);the Canada-China Scientific and Technological Cooperation (No.2010DFA11320);the National Natural Science Foundation of China (Nos.60802033 and 60873190);the National High-Tech R&D Program (863) of China (No.2008AA01Z211)

摘　　要：We propose two novel power control policies for a two-way amplify-and-forward (AF) relaying system,in which each node (two sources and one relay) is assumed to operate under bothminimum and peak power constraints.Through the exploitation of instantaneous channel gains,the first policy can maximize the sum rate of the system.However,the instantaneous channel gains may be unavailable in a rapid time-varying system,where the first policy is inoperable.Consequently,a robust power control policy which requires only mean channel gains is proposed to maximize the upper bound of the average sum rate,and the properties of this policy are investigated.Simulation results show that,by comparison with the policy in which all the nodes use their peak transmit power,the proposed power control policies can provide considerable system performance improvement.Furthermore,the performance difference between the two proposed policies is negligible when the relay is close to one source.We propose two novel power control policies for a two-way amplify-and-forward （AF） relaying system, in which each node （two sources and one relay） is assumed to operate under both minimum and peak power constraints. Through the exploitation of instantaneous channel gains, the first policy can maximize the sum rate of the system. However, the instantaneous channel gains may be unavailable in a rapid time-varying system, where the first policy is inoperable. Consequently, a robust power control policy which requires only mean channel gains is proposed to maximize the upper bound of the average sum rate, and the prop- erties of this policy are investigated. Simulation results show that, by comparison with the policy in which all the nodes use their peak transmit power, the proposed power control policies can provide considerable system performance improvement. Furthermore, the performance difference between the two proposed policies is negligible when the relay is close to one source.

关 键 词：Amplify-and-forward (AF) relaying Power control Two-way relay channel Bidirectional relaying Cooperative communication 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]