存在多流干扰的水声信道信号检测初探

为提高海洋水声通信系统的传输速率,采用并行多发射源技术是可行方案之一,其存在的困难是接收信号存在多流干扰,海洋水声信道又存在比较严重的多途径干扰,因此须对接收端信号检测器的抗多流及抗多径性能进行全面考察.初步研究了正交动态滤波器的抗多流和多径干扰的能力,在无多径干扰的情况下,理论分析和仿真结果均显示其在检测信号的同时可以完全抑制多流信号的干扰,在存在多途径干扰的情况下,仿真结果显示其信号检测能力及抗多流干扰能力虽有所下降,但是,在多途径效应不是特别严重的情况下,仍可正确地检测出所需信号.

A Preliminary Study on Detection of Mult-flow Signal in Underwater Acoustic Channel

To improve transfer rate of underwater acoustic communication using multi-source is one of the possible options,but there exists multi-flow interference in received signal.Again there is serious multi-path interference in ocean underwater acoustic channel.So performance of receiver detector should be examined under multi-flow and multi-path signal.A preliminary study of orthogonal dynamic filter are conducted.In the case of no multi-path interference,the theoretical analysis and simulation results show that it can correctly detect signal and completely suppress influence of multi-flow interference.In the case of multi-path interference existing,simulation results show that its capability on the signal detection and anti-multi-flow interference decreased in some degree,however,as long as the multi-path interference is not very serious,signal could still be correctly detected.