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基于瞬时信道状态信息的串行多中继选择方法


  摘 要:提出了一种分布式串行多中继选择方法。该方法涉及MAC层协议,在RTS包中添加一个字段F,用于存储选择中继的个数,并通过广播RTS和CTS包获得中继节点的前、后向信道质量的瞬时测量值,再通过定时和广播flag包实现在时间上串行选择多个中继。推导了瑞利衰落下串行多中继选择的碰撞概率式,仿真并对比了最优中继选择和串行双中继选择的碰撞概率。结果表明,碰撞概率在可容忍的范围内,该方法切实可行。

  关键词:串行; 多中继选择; MAC层; 碰撞概率

  中图分类号:TP393.03文献标志码:A

  文章编号:1001-3695(2010)06-2211-04

  doi:10.3969/j.issn.1001-3695.2010.06.061

  Serial multiple relay selection method based on instantaneous CSI

  HAN Weijia, CHEN Qianbin, TANG Lun

  (College of Communication & Information Engineering, Chongqing University of Posts & Telecommunications, Chongqing 400065, China)

  Abstract:This paper proposed a distributed serial multiple relay selection method based on instantaneous channel state information(CSI). It involved MAC layer’s protocols, added field F to RTS package and used to storage the numbers of selected relays,and acquiring the instantaneous measurements of relay’s backward, forward channel quality by broadcasting RTS and CTS packages,then exploited timing and broadcasting flag package to achieve time serial multiple relay selection. It derived the collision probability formula of this method with Rayleigh Fading, and conducted computer simulations to show the collision probability of best relay selection and serial two relay selection. Simulations demonstrate that the collision probability is within the range of tolerance and the new method is feasible.

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