频率选择性MIMO衰落信道中基于导频的软均衡算法

MIMO无线传输技术的有效应用有赖于高效的空时干扰抑制策略.针对频率选择性衰落MIMO信道特点,本文提出一种联合判决反馈干扰抵消和粒子滤波的软均衡方案.首先利用导频,确定了各发送信号最强径与接收天线之间的对应关系以及基于信干噪比的判决反馈干扰抵消顺序;其次,依据后验估计准则,充分利用径强度及接收信号结构信息,构造了接收信号的重要性分布函数,采用粒子滤波算法对感兴趣用户信号实施最优判决并进行干扰抵消.仿真结果表明:相比于其他均衡方法,本算法可以有效抑制均衡误差的传播,同时具有较低的计算复杂度.

Soft Equalization Algorithm for Frequency-Selective MIMO Fading Channels via Pilot

The effective application of multiple-input multiple-output(MIMO) technology lies in efficient space-time interference cancellation strategy.This paper proposes a joint decision feedback interference cancellation(DFIC) and particle filtering(PF) soft equalization scheme for frequency selective MIMO channels.Firstly we set up the relation between the signal's strongest paths and receive antennas index through pilot,and also determine the DFIC order based on signal-to-interference-plus-noise ratio.Next,in terms of a posterior estimation criterion,with the information of path strength as well as receive signal structure,we construct the importance distribution of received signal,and adopt the PF to obtain the optimal decision of interested signal,with which the interference cancellation is implemented.Simulation results show that equalization error propagation is hold back effectively and the computational complexity is reduced significantly.