Ad Hoc网络中一种空时协作中继方案的性能研究  

Performance analysis of an STBC-based cooperative relay scheme in wireless Ad Hoc networks

作　　者：王涛[1] 郑宝玉[1] 陈超[1] 

机构地区：[1]南京邮电大学信号与信息处理研究所,南京210003

出　　处：《重庆邮电大学学报（自然科学版）》2007年第B06期49-52,65,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60372107)

摘　　要：在Ad Hoc网络中,数据通过多跳传输到达目的节点。因此,中继节点的选择在Ad Hoc网络中有着至关重要的作用。传统的中继方案往往根据信道状态的好坏,从源节点的邻居节点中选出一个状况最佳的节点作为中继节点,但是当中继与目的间的信道状态不好时,这种中继方案仍存在一定的问题。为了解决这一问题,考虑利用无线信道的广播特性,基于空时编码,给出了一种依赖于两个中继节点的空时协作中继方案;并基于有限状态Markov模型,对系统的误比特率、吞吐量、时延和丢包率等性能进行了分析。仿真结果表明,相比于传统的单中继方案,该方案能获得较好的性能增益。In wireless Ad Hoc networks, data are always transferred through multiple hops before reaching the destination. Hence, relay selection becomes very important to source node. Typically, traditional relay selecting scheme chooses the node which has the best channel state as its relay from all the neighbor nodes. Utilizing the broadcast property of wireless channel, an STBC-based （Space Time Block Coding） cooperative relay scheme with two relay nodes is given in this paper. Then, a finite Markov model is used to analyze the performance of the network. Numerical results indicate that the proposed scheme outperforms the traditional single relay method. The performance index such as BER, throughput, end-to-end delay and dropping ratio are considerably improved.

关 键 词：Ad HOC网络 协作分集 中继选择 空时编码 

分 类 号：TN929.5[电子电信—通信与信息系统]