无线传感器网络中分布式网络信道编码性能研究  

Performance of Adaptive Distributed Network Channel Coding Scheme in the Wireless Sensor Network

作　　者：许卫东[1] 

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710071

出　　处：《电网与清洁能源》2013年第10期42-46,共5页Power System and Clean Energy

基　　金：国家自然基金项目(61001131)~~

摘　　要：智能电网的无线传感器网络中,多个源节点通过中继协作与一个目的节点进行通信,这种场景称为多址接入中继信道(MARC)。针对多个中继节点的MARC,分析了基于Turbo乘积码(TPC)的自适应分布式网络信道编码(ADNCC)。ADNCC中,每个源节点采用相同的线性系统分组码对自己的信息独立编码,广播发送到中继和目的节点。中继节点将所有源节点的码字作为行码,采用第二个线性系统分组码进行列编码,只将新产生的列校验元传送目的节点。目的节点接收到来自源节点的码字和中继节点的列校验元构成一个完整的乘积码,目的节点进行Turbo译码。研究了源-中继链路(S-R链路)对ADNCC性能的影响,提出了选择式编码协作(S-CC)和估计式编码协作(E-CC)2种解决方案,仿真结果表明,E-CC方案的性能比S-CC方案好,在加性高斯白噪声(AWGN)信道下,有超过3dB的编码增益。In this paper, we study Adaptive Distributed Network Channel Coding（ADNCC） scheme based on Turbo product codes（TPC） where a number of sensors in the smart grid transmit to the same destination with the help of multi-relay. This network can be modeled by a multiple-access relay channel（MARC）. In the proposed scheme, each source encodes its data independently using the same systematic linear block code. The codeword transmitted from the sources to the destination are eavesdropped by multi-relay. A product code is built at the relays, with rows being the source codeword, using a second systematic linear block code as column encoder. The resulting additional redundancy is then transmitted to the destination. From received source and relay codeword, the product code word observation is formed and Turbo decoded at the destination. In order to mitigate the influence of the degraded source-relay channel, we investigate Selective Coding Cooperation（S-CC） scheme and Estimative Coding Cooperation （E-CC） scheme. Different cooperation schemes are compared in terms of performance. A coding gain of more than 3 dB of E-CC scheme is achieved on the additive white Gaussian noise （AWGN） channel.

关 键 词：分布式网络信道编码 TURBO乘积码 无线传感器网络 智能电网 

分 类 号：TN911.22[电子电信—通信与信息系统]