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针对现有的滤波多音调制(FMT)水声通信需要使用较长的自适应均衡器来抑制水声信道中严重的多途效应引起的码间干扰这一问题,提出了迭代时反和自适应均衡联合的FMT水声通信方法.首先利用迭代方法构造的时反滤波器对解调后的各子载波信号进行滤波处理,然后利用自适应均衡器抑制残余的码间干扰.仿真分析和试验结果表明:由于迭代方法构造的时反滤波器可以显著压缩信道中的多途扩展,因此与仅使用自适应均衡的FMT水声通信方法及传统时反和自适应均衡联合处理的FMT水声通信方法相比,可以有效降低自适应均衡器的复杂度,并且通信性能更优.
In order to solve the problem of existing intermodulation interference caused by the serious multi-way effect in underwater acoustic channel, the existing adaptive multi-tone filter (FMT) underwater acoustic communication needs to use a longer adaptive equalizer. Adaptive FMT method for underwater acoustic communication.Firstly, the time-varying filter constructed by the iterative method is used to filter the demodulated sub-carrier signals and then the adaptive equalizer is used to suppress the residual intersymbol interference. Simulation analysis and experiment The results show that the iterative method can significantly reduce the multi-path expansion in the channel due to the time-inverse filter. Therefore, compared with the FMT system using FMT and the traditional anti-phase and adaptive equalization Compared with the method, the complexity of the adaptive equalizer can be effectively reduced and the communication performance is better.