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无线光MIMO技术结合了天线发射分集、接收分集与信道编码分集,可以显著提高信道容量。介绍了笔者在分层空时编码方面的若干研究进展,分析了误码率特性与发射/接收天线数目、检测算法之间的关系,比较了水平分层空时码、螺旋分层空时码、对角分层空时码和垂直分层空时码不同的编码方案,以及不同检测算法对不同的湍流强度的抑制作用。经分析得出:三种分层空时编码性能最好的是对角分层空时编码,其次是螺旋分层空时编码,最后是水平分层空时编码。
Wireless optical MIMO technology combines antenna transmit diversity, receive diversity, and channel code diversity to significantly increase channel capacity. This paper introduces the author’s research progress in layered space-time coding, analyzes the relationship between BER characteristics and the number of transmitting / receiving antennas and detection algorithms, and compares horizontal hierarchical space-time codes, spiral layered space-time codes , Diagonal stratified space-time codes and vertical stratified space-time codes, as well as different detection algorithms for different turbulence intensities. The analysis shows that: the best performance of the three layered space-time coding diagonal stratified space-time coding, followed by spiral stratified space-time coding, and finally the horizontal stratified space-time coding.