Energy efficiency enhancement of two-way amplifier forward relaying with channel estimation error  

作　　者：师晓晔 葛建华 李靖 张沉思 

机构地区：[1]State Key Laboratory of Integrated Service Networks, Xidian University

出　　处：《Journal of Central South University》2014年第3期987-992,共6页中南大学学报（英文版）

基　　金：Project(IRT0852) supported by the Program for Changjiang Scholars and Innovative Research Team in University,China;Project(2012CB316100) supported by the National Basic Research Program of China;Projects(61101144,61101145) supported by the National Natural Science Foundation of China;Project(B08038) supported by the "111" Project,China;Project(K50510010017) supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：In order to save energy consumption of two-way amplifier forward(AF) relaying with channel estimation error, an energy efficiency enhancement scheme is proposed in this work. Firstly, through the analysis of two-way AF relaying mode with channel estimation error, the resultant instantaneous SNRs at end nodes is obtained. Then, by using a high SNR approximation, outage possibility is acquired and its simple closed-form expression is represented. Specially, for using the energy resource more efficiently, a low-complexity power allocation and transmission mode selection policy is proposed to enhance the energy efficiency of two-way AF relay system. Finally, relay priority region is identified in which cooperative diversity energy gain can be achieved. The computer simulations are presented to verify our analytical results, indicating that the proposed policy outperforms direct transmission by an energy gain of 3 dB at the relative channel estimation error less than 0.001. The results also show that the two-way AF relaying transmission loses the two-way AF relaying transmission loses its superiority to direct transmission in terms of energy efficiency when channel estimation error reaches 0.03.In order to save energy consumption of two-way amplifier forward （AF） relaying with channel estimation error, an energy efficiency enhancement scheme is proposed in this work. Firstly, through the analysis of two-way AF relaying mode with channel estimation error, the resultant instantaneous SNRs at end nodes is obtained. Then, by using a high SNR approximation, outage possibility is acquired and its simple closed-form expression is represented. Specially, for using the energy resource more efficiently, a low-complexity power allocation and transmission mode selection policy is proposed to enhance the energy efficiency of two-way AF relay system. Finally, relay priority region is identified in which cooperative diversity energy gain can be achieved. The computer simulations are presented to verify our analytical results, indicating that the proposed policy outperforms direct transmission by an energy gain of 3 dB at the relative channel estimation error less than 0.001. The results also show that the two-way AF relaying transmission loses the two-way AF relaying transmission loses its superiority to direct transmission in terms of energy efficiency when channel estimation error reaches 0.03.

关 键 词：AMPLIFY-AND-FORWARD channel estimation error cooperative energy gain energy efficiency outage probability two-way relay 

分 类 号：TN92[电子电信—通信与信息系统]