稀疏信道条件下正交多载波扩频水声通信无导频信道估计算法

A pilot-free channel estimation algorithm for orthogonal multicarrier spread spectrum communication via sparse underwater acoustic channel

提出了一种无导频信道估计算法,该算法首先利用水声信道的稀疏特性对扩频信号进行识别,再利用扩频信号识别结果对水声信道响应进行判决反馈估计,从而实现对稀疏水声信道响应的可靠重建。仿真和湖上试验结果证实:无导频信道估计算法可以在不降低通信质量的前提下,实现对水声通信信号的稳健均衡,提升水声通信速率。

A pilot-free channel estimation algorithm is proposed.This algorithm utilizes the sparseness of underwater acoustic channel to effectively recognize the spread spectrum signal.Then the channel response is estimated using decision feedback scheme according to the result of recognition,thereby realizing the robust reconstruction for underwater acoustic channel.The results obtained by Monte Carlo simulation and lake-trial are provided,demonstrating that the proposed algorithm can realize a reliable equalization and effectively improves the efficiency of underwater acoustic communication without losing the robustness.