计算机工程与应用 ›› 2010, Vol. 46 ›› Issue (21): 1-3.DOI: 10.3778/j.issn.1002-8331.2010.21.001

• 博士论坛 • 上一篇    下一篇

无线传感器网络中的扩展编码协作方法

李 冬,史浩山,程 伟,杨俊刚   

  1. 西北工业大学 电子信息学院,西安 710072
  • 收稿日期:2010-03-17 修回日期:2010-05-24 出版日期:2010-07-21 发布日期:2010-07-21
  • 通讯作者: 李 冬

Extended coded cooperative diversity in wireless sensor networks

LI Dong,SHI Hao-shan,CHENG Wei,YANG Jun-gang   

  1. Electronic Information College,Northwestern Polytechnical University,Xi’an 710072,China
  • Received:2010-03-17 Revised:2010-05-24 Online:2010-07-21 Published:2010-07-21
  • Contact: LI Dong

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。

关键词: 空时编码, 协作分集, 无线传感器网络, 协作节点

Abstract: 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 outperforms the OAC and Toplitz about 42%~71%,and more relay nodes have better effect on the system performance improvement.

Key words: space-time codes, cooperative diversity, wireless sensor networks, cooperative nodes

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