MIMO水声通信中的空时分组扩展编码方案探讨

采用多输入多输出（MIMO）结构和空时编码可以使水声通信系统获得分集增益,改善系统性能。针对水声信道中的频率选择性衰落,研究了一种用于MIMO水声通信系统的空时分组扩展编码方案（STBSC）,利用正交扩频编码克服了水声信道中多径干扰对空时分组编码（STBC）信号正交性的破坏。给出了方案的系统模型和实现框图,采用MIMO水声模型对方案的性能进行了仿真。仿真结果表明,STBSC方案在多径水声信道中可以得到完全发射分集。最后介绍了方案的水库试验,试验结果表明了方案的有效性。

Application research of space-time coding MIMO system for underwater acoustic communication

Performance gains are achievable through the use of multiple-input multiple-output（MIMO） configurations and space-time codings for underwater acoustic（UWA） communication systems.This paper investigates a space-time block spreading coding（STBSC） scheme for MIMO communication systems over frequency-selective fading UWA channels.Space-time bolck coding with orthogonal spectrum spreading codings are used in this scheme to reduce the orthogonality impairment by multipath spreads in the UWA channels.The system model and schematic diagram of the scheme are given.The performance of the scheme are analyzed with MIMO UWA channel model,and the lake trial of the scheme is introduced.Numeric results show that the full transmitting diversity is achievable by the STBSC scheme over the multipath UWA channels.and experiment results show the effectiveness of the STBSC scheme.