中文摘要：

针对带限的水声通信系统在干扰严重的水下环境中性能严重恶化问题,本文将变换域通信系统（Transform Domain Communication System,TDCS）技术引入水声通信领域,利用水声信道的稀疏特性,提出了一种基于对分坐标下降（Dichotomous Coordinate Descent,DCD）技术的多路径匹配追踪（Multipath Matching Pursuit,MMP）稀疏水声信道估计方法,该方法满足约束等距限制（Restricted Isometry Property,RIP）,每次搜索出与残差向量最相关的多个可能的支撑集,而DCD技术可以解决MMP信道估计算法中矩阵求逆带来的运算量大以及数值不稳定问题,特别适用于FPGA等定点硬件平台。研究结果表明：MMP-DCD算法估计所得的水声信道均方误差、误码率性能比最小二乘法好;卷积码编码可以降低该通信系统误码率。

英文摘要：

This paper addresses the defect of the acoustic communication system with band limitations,whose per-formance seriously deteriorates in the acoustic environment with significant disturbances.The transform domain communication system technology was introduced into the field of underwater acoustic （UWA ） communication. Basedon the sparse characteristics of the underwater acoustic channel,a multipath matching pursuit （ MMP ） channel es-timation method was proposed based on dichotomous coordinate descent （DCD ） technology. T he method satisfiesthe restricted isometry property （ RIP ） to searches for a number of possible support sets that are most relevant to theresidual vector,and DCD can solve the problem of large computational complexity and numerical instability by ma -trix inversion in MMP channel estimation algorithm. The simulation results show that mean square error and bit errorrate of MMP algorithm are better than the least squares algorithm. Convolution coding can reduce the bit error rateof communication system.