Two_way协作中继系统节点选择策略与性能分析  

Nodes selection strategy and performance analysis in two-way cooperative relay system

作　　者：陈纯锴[1] 刘雷[2] 汤春明[1] 

机构地区：[1]天津工业大学电子与信息工程学院,天津300387 [2]武汉大学电气工程学院,武汉430072

出　　处：《天津工业大学学报》2014年第4期53-57,共5页Journal of Tiangong University

基　　金：国家自然科学基金项目(60972077);天津工业大学基金项目(030372)

摘　　要：为克服协作通信系统中单向中继网络频谱效率低的问题,研究了双向信道中的中继选择问题.提出了放大转发的双向单中继选择(TWRS-AF)及网络编码的双向中继选择(TWRS-NC,TWDRS-NC)策略,推导了误比特率及分集表达式,并通过仿真对两种方式的性能进行比较分析.研究表明:在多中继无线网络中,两策略均可实现全分集;在高信噪比区域,TWRS-NC误码率是TWRS-AF的1/2,TWRS-NC获得增益是TWRSAF的2倍;对于误比特率为10-4时,双最大标准优于MIN-W选择标准1 dB.In cooperative communication systems, in order to overcome the low spectral efficiency problem of one-way relay network, the relay selection problem of two-way relay channel was investigated. The single relay selection strategy was proposed based on amplify forwarding and two-way relay selection strategy was proposed based on network coding. Moreover, bit error rate （BER） and diversity expressions were derived, and the performance of two ways was compared by the simulation. The results indicated that two strategies can achieve full diversity in multi-relay wireless networks. In the high SNR region, the bit error rate of TWRS-NC is half of TWRS-AF, and the gain of TWRS-NC is two times of the TWRS-AF;when bit error rate is fixed at 10-4, the double maximum standard is better than MIN-W selection criteria 1 dB.

关 键 词：协作分集 双向中继网络 编码增益 中继选择 分集阶数 

分 类 号：TN929[电子电信—通信与信息系统]