基于OFDM的DF中继网络能效最优路径选择策略  

Optimal Energy-Efficient Path Selection Scheme in OFDM-based DF Relay Networks

作　　者：黄高勇[1,2] 方旭明[1] 陈煜[1] 张强锋[2] 

机构地区：[1]西南交通大学信息编码与传输省重点实验室,四川成都610031 [2]西南交通大学峨眉校区计算机与通信工程系,四川峨眉山614202

出　　处：《西南交通大学学报》2015年第1期58-65,共8页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(61071108);中央高校基本科研业务费专项资金青年教师百人计划资助项目(SWJTU2011BR065EM);教育部"春晖计划"合作科研项目(Z2014069)

摘　　要：针对三节点解码转发(DF)中继OFDM(orthogonal frequency division multiplexing)网络,提出一种能效最优路径选择策略.通过将中继链路衰落值和直传链路衰落值转化为等效路径损耗值,给出了一种基于等效路径损耗指数的能效最优路径选择准则,并分析了电路功率消耗、带宽、速率需求以及信道条件等因素在路径选择时对系统能效的影响.仿真结果表明,能效最优路径与链路速率需求、传输带宽以及信道条件有关,并满足能效最优路径判决准则,当基站(BS)和用户(MS)间距离为610 m,速率等于5和6 Mbit/s时,本文方案的能效比最大调和信道增益路径选择方案分别提高11.8%和40.5%.Based on a three-node orthogonal frequency division multiplexing （OFDM）-based relay transmission network and decode-and-forward （DF） relaying strategy, an optimal energy-efficient path selection scheme was proposed. By converting the fading values of both the relay and direct links into the equivalent path loss values, an optimal energy-efficient path selection criterion based on equivalent path loss exponent was presented. The effects of the circuit power consumption, bandwidth, data rate requirements and channel conditions on the system energy efficiency in the selection of transmission path were also analyzed. Simulation results show that the optimal energy-efficient transmission path depends on the bandwidth, data rate, and channel conditions, and satisfies the decision criteria of the optimal energy-efficient path. Comparing with the path selection scheme based on the maximum harmonic channel gain, when the distance between base station （BS） and mobile station （MS） equals 610 m, and data rates equal 5 and 6 Mbit/s respectively, the energy efficient values of the proposed scheme are increased by 11.8% and 40.5% respectively.

关 键 词：能效 中继网络 路径选择 正交频分复用 

分 类 号：TN929.5[电子电信—通信与信息系统]