非对称调制物理层网络编码性能分析与优化  

Performance Analysis and Optimization for Asymmetric Physical-layer Network Coding

作　　者：齐昕[1] 左鹏[2] 郭道省[3] 李海元[4] 

机构地区：[1]解放军理工大学通信工程学院研究生2队 [2]总参谋部信息化部驻国营714厂军事代表室 [3]解放军理工大学通信工程学院 [4]中国人民解放军69242部队

出　　处：《军事通信技术》2014年第2期14-19,78,共7页Journal of Military Communications Technology

摘　　要：物理层网络编码作为一种新型中继处理技术,因其具有提高系统吞吐量、提升带宽利用率等优势而受到广泛关注。目前,对物理层网络编码双向中继系统误码性能的研究主要集中于两源节点采用相同调制方式,BPSK-QPSK非对称调制方式下的系统误码性能尚未可知。文章研究了BPSK-QPSK调制物理层网络编码双向中继系统的BER性能,推导了多址接人阶段的BER精确表达式,进一步提出了可使中继处的BER最小的功率分配策略。文中的分析方法可拓展到其他调制方案。仿真和数值表明:文中的理论分析与仿真结果完全吻合,得到的BER公式可有效地评估系统误码性能,所提功率分配策略可明显改善系统误码性能。As a new relay processing technique, Physical-layer Network Coding（PNC） can improve the throughput of systems and increase bandwidth efficiency, and thus has attracted a significant amount of attention. So far, most investigations of the Bit-Error-Rate（BER） perform- ance of PNC two-way relay systems concentrated on systems based on the assumption that both the sources adopt the same modulation and the BER performance of the systems with BPSK- QPSK asymmetric modulation is still unknown. In this paper, the BER performance of BPSK- QPSK modulated PNC two-way relay systems was investigated and exact expression of Multiple Access Channel （MAC） BER was derived. In addition, a power allocation strategy was proposed to minimize the BER at the relay. The proposed analyzing approach can be generalized to other systems. Simulation and numerical results demonstrate that the theoretical analysis accurately matches with the simulation results, that the theoretical expressions can effectively evaluate the BER performance, and that the power allocation strategy can improve the BER performance ef- fectively.

关 键 词：物理层网络编码 非对称 功率分配 比特错误概率 双向中继 

分 类 号：TN925[电子电信—通信与信息系统]