基于网络编码的协作中继技术  

Cooperative relaying technologies based on network coding

作　　者：戴丽妮[1,2,3] 周婷[1,2,3] 徐景[1,2,3] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]上海无线通信研究中心,上海200335 [3]中国科学院无线传感网与通信重点实验室,上海200050

出　　处：《计算机工程与设计》2012年第3期851-855,共5页Computer Engineering and Design

基　　金：国家科技重大专项基金项目(2008ZX03004);上海市启明星基金项目(10QA1406300);上海市重点基金项目(09511501100);上海市国际合作基金项目(09530702500)

摘　　要：为提高协作中继中网络编码的性能,提出了一种软网络编码-软估计转发(SNC-SEF)的改进方案。在中继节点中对接收到的多路信息依次进行软输入软输出的信道编码、网络编码以及最为重要的基于最大似然准则推导的软符号调制的操作。该方案在最大限度地保留了软信息的同时可以获得解码增益。仿真实验结果表明,SNC-SEF方案相比传统的网络编码-解码转发(NC-DF)方案有明显的系统增益。To enhance the performance of network coding in cooperative relaying scenario, a soft-input-soft-output network coding and soft symbol estimate-and-forward （SNC-SEF） scheme is proposed, in which soft channel re-encoding, soft-input-soft- output network coding and soft modulating on the decoded data received from different sources are performed by the relay node. In the proposed scheme, the key point is the soft modulating which is derived based on maximum likelihood criteria. The scheme can both keep soft information to maximum and obtain decoding gain. Simulation results are presented to prove that the proposed SNC-SEF scheme much outperforms the traditional network coding-decode and forward （NC-DF） scheme.

关 键 词：网络编码 协作中继 BCJR算法 软编码 最大似然法则 

分 类 号：TN925[电子电信—通信与信息系统]