快衰落信道下的分布式MIMO差分检测方案  

Differential detection scheme for distributed MIMO systems in fast fading channel

作　　者：窦冬冬[1] 刘军博[1] 王大鸣[1] 李兆训[1] 

机构地区：[1]解放军信息工程大学信息工程学院,河南郑州450002

出　　处：《通信学报》2012年第6期50-54,63,共6页Journal on Communications

基　　金：国家科技重大专项基金资助项目(2011ZX03003-003-02;2009ZX03003-008-02);国家高技术研究发展计划("863"计划)基金资助项目(2009AA011504)~~

摘　　要：在快衰落分布式MIMO系统中,由于信道状态信息的快速变化,很难满足相邻空时码块的信道衰落系数保持不变,导致传统的分布式MIMO差分检测方案性能严重下降而不再适用。针对这一问题,提出了一种改进的分布式MIMO的差分检测方案。这种方案通过在发送端重组相位差分调制后的空时码矩阵,以一定的处理时延和额外的能量开销来降低信道的快速变化对系统性能的影响。理论分析与计算机仿真均表明,在快衰落环境中,与已有的分布式发射天线差分空时检测相比能够显著提高系统的误码性能。In the fast fading distributed MIMO system,it is difficult to keep the channel fading coefficient unchanged in adjacent space-time blocks due to the rapid changed state information,which leads to the traditional distributed MIMO differential detection scheme is not suitable any.Aiming at this matter,an improved differential detection scheme was proposed.By recombining space-time codes which were differential modulated by phase,this differential detection scheme reduced the influence from fast fading channels at the cost of larger processing delay and additional transmission power.Theoretical analysis and some computer simulation results show that this scheme can improve the BER performance remarkably in fast fading channels compared with the existing the conventional differential space time detection.

关 键 词：分布式发射天线 多输入多输出 信道传播时延 差分检测 

分 类 号：TN929.5[电子电信—通信与信息系统]