一种基于信息传递的MIMO系统符号检测算法

A Symbols Detection Algorithm of MIMO Systems Based on Information Propagation

提出了一种新的基于信息传递的MIMO系统符号检测算法.该算法首先采用MMSE方法进行均衡,以均衡后的软信息为基础,按照各接收天线上接收信号的信干噪比大小,以单个接收天线为单位,依次对选定的发送符号作进一步判决,每次判决的结果均传递给其他接收天线,用来参与对其他符号的检测.理论分析和仿真结果均表明,该算法可以有效改善传统MMSE均衡的效果,在接收天线数目不是很大的情况下,可以取得与V-BLAST算法相当的性能,相比于V-BLAST算法,计算复杂度大大降低.

Symbols detection algorithm of multiple-input multiple-output （MIMO） systems based on information propagation is proposed. First MMSE method is adopted for equalization then based on the equalized soft information, according to the signal-interference-noise ratio of the signal received by the antennas, taking individual receiving antenna as unit, the emission symbols are selected and further decided one by one. The result of each decision is propagated to all the following antennas to improve the performance. Theoretical analysis and computer simulation results show that this algorithm achieves better performance than minimum mean square error （MMSE） algorithm and in the case that the number of receiving antennas is not very large it is comparable to the classic Vertical Bell Labs Layered Space-Time （V-BLAST） algorithm. However, the computation complexity is much lower than V-BLAST.