基于相乘转发的TWRN广义差分调制性能分析  

Performance Analysis of Generalized Differential Modulation in TWRN with Multiply-and-Forward Relaying

作　　者：王飞[1] 许魁[2] 吴连国[2] 张冬梅[2] 刘洋[1] 

机构地区：[1]中国人民解放军73667部队 [2]解放军理工大学通信工程学院

出　　处：《军事通信技术》2017年第1期7-12,25,共7页Journal of Military Communications Technology

基　　金：国家自然科学基金重大研究计划资助项目(91438115);国家自然科学基金资助项目(61371123;61301165);江苏省自然科学基金资助项目(BK2011002;BK2012055)

摘　　要：在双向中继网络(TWRN)中采用差分调制,解决了接收机需要对信道状态信息进行估计的问题,但性能仍有待提升。文章针对双向相乘中继提出一种广义的差分调制(GDM)和检测方法。源数据帧分成若干数据块,每个块由一个参考符号(RS)和多个一般符号(NS)组成,相邻参考符号进行差分,一般符号与块内参考符号差分。经过双向相乘中继,接收端不需要知道信道状态信息就可以恢复数据比特。文章分析了该方法的误比特率(BER)性能,并对块内参考符号和一般符号进行了功率分配来最小化误比特率。仿真结果表明相比传统差分调制的MF中继,该方法有较低的误比特率。Differential transmission can be applied to a Two-way Relay Network（TWRN）,so that the receiver does not need Channel State Information（CSI）.However,the performance of the system can be improved further.In this paper,a Generalized Differential Modulation（GDM）scheme for Multiply-and-Forward（MF）relaying was proposed.In the proposed scheme,each frame transmitted by the source is divided into several blocks,and each block consists of one reference symbol and several normal symbols.The reference symbol in each block is differentially encoded based on the previous reference symbol,whereas the normal symbols are differentially encoded based on the reference symbol in the same block.After two-way MF relaying,the information bits can be recovered without any knowledge of CSI.The Bit-Error-Rate（BER）performance of the proposed scheme was analyzed.The power allocation among the Reference Signal（RS）and the Normal Signal（NS）in each block were also investigated to minimize the lower bound of BER.Simulation results show that the BER performance for the GDM scheme is improved compared to the conditional scheme.

关 键 词：相乘转发 差分调制 功率分配 双向中继 

分 类 号：TN925.1[电子电信—通信与信息系统]