无线传感器网络中的扩展编码协作方法  

Extended coded cooperative diversity in wireless sensor networks

作　　者：李冬[1] 史浩山[1] 程伟[1] 杨俊刚[1] 

机构地区：[1]西北工业大学电子信息学院,西安710072

出　　处：《计算机工程与应用》2010年第21期1-3,20,共4页Computer Engineering and Applications

基　　金：教育部博士点基金(No.20050699037)

摘　　要：为了在达到高码率的同时降低译码复杂度,提出了一种新的基于无线传感器网络的扩展空时编码协作方法,其构造原理是对OAC编码中的每一个参数插入Alamouti编码。通过实验仿真了该方法与原有方法之间的性能对比,以及不同协作节点数与系统性能之间的关系。仿真结果表明,在协作节点为4时,所提出的编码方法相比OAC编码和Toeplitz编码,其误符号率下降幅度为62%～90%,在协作节点数为8时,其误符号率下降幅度为42%～71%,并且随着协作节点数的增加系统性能得到提升。In order to reduce the decoding complexity while having a high rate,a new type of the expanded space-time coded cooperative diversity method is utilized in wireless sensor networks.It is constructed by embedding Alamouti codes into every input information symbols of OAC（Overlapped-Alamouti Codes）.With the simulation,the constraint of the cooperative nodes and the comparison between the proposed method and the existing method are investigated.Simulation results suggest,when M=4,the proposed scheme outperforms the OAC and Toeplitz about 62%～90%.When M=8,the proposed scheme outper-forms the OAC and Toplitz about 42%～71%,and more relay nodes have better effect on the system performance improvement.

关 键 词：空时编码 协作分集 无线传感器网络 协作节点 

分 类 号：TN92[电子电信—通信与信息系统]