能量均衡的协作中继选择算法  

Cooperative relay selection algorithm based on energy equilibrium

作　　者：戴翠琴[1] 李途[1] 

机构地区：[1]重庆邮电大学移动通信技术重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2014年第2期201-206,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61201205);重庆市自然科学基金(CSTC2012jjA40042);重庆市自然科学基金计划重点项目(CSTC2013jjB0114);重庆市教委优秀成果转化项目(Kjzh11206)~~

摘　　要：为了最大化协作多中继通信系统的网络寿命,研究了在放大-转发(amplification-forward,AF)中继协作方式下网络寿命的折中优化问题,提出了一种最优能量均衡(optimal energy equilibrium,OEE)的中继协作节点选择方案。通过对AF中继每一跳接收端信噪比(signal noise rate,SNR)的计算,推导了AF两跳中继目的终端的误码率表达式,同时联合节点的剩余能量信息和信道状态信息(channel state information,CSI),利用能量均衡的思想,合理引入和设置优化因子来有效选择转发中继,延长网络寿命。理论分析和仿真结果表明,相比CSI中继选择和模糊综合评价(fuzzy comprehensive evaluation,FCE)中继选择方案,提出的中继选择方案不仅有效地提高了系统的网络寿命,而且在相同信噪比的情况下误码率性能有明显的改善。In this paper, we study the optimal network lifetime problem in the amplification-forward （AF） relay cooperative communication network and propose an optimal energy equilibrium （OEE） relay node selection scheme to maximize the li-fetime of cooperation mutli-relay communication network. First, we get the destination terminalg bit error rate （BER） ex-pression of two-hop AF relay by calculating the each hopg receiving SNR of AF relay. And then, we introduce the optimal factor to effectively select the forward relay for further extending network lifetime by combining the nodeg residual energy in- formation and channel state information （CSI） and exploiting the thought of energy equilibrium. The theoretical analysis and simulation results show that the proposed relay selection scheme can effectively enhance the network lifetime and obvi-ously improve the bite error rate （.BER） performance compared with CSI relay selection scheme and fuzzy comprehensive e-valuation （FCE） relay selection scheme.

关 键 词：协作中继 剩余能量 信道状态 网络寿命 误码率 

分 类 号：TN929.5[电子电信—通信与信息系统]