簇稀疏水声时变信道的估计研究

Recently, the urgent needs in both of the military and civilian aspects lead to underwater acoustic communication technology become the focus of research. The doubly spread of delay, Doppler of the time-varying underwater acoustic channel brings great challenges to the development of high-speed and large capacity of underwater communication technology. Therefore, the estimations of attenuation factor, time delay, Doppler etc parameters of underwater acoustic channel are the key programs. Based on the previous research work on the acoustic channel estimation of the applicant, the project is starting from the structural characteristics of the underwater acoustic channel, combining with the research methods of acoustic signal processing and wireless communication, will design variable estimation methods of underwater acoustic channel with clustered sparse structure, especially focus on the modeling theories and methods of clustered sparse underwater acoustic channel, time delay Doppler model based optimization algorithms, and the theoretical analysis and experimental verification of the 2-D domain estimation algorithms. The innovation and breakthrough of the above theories and methods, may open new ways to obtain efficiently time-varying underwater acoustic channel of clustered sparse structure. The research has important academic significance and application prospects of high performance of underwater acoustic communication system.

近年来，军用和民用方面的迫切需求使水声通信技术成为关注的焦点。由于时变水声信道的时延、多普勒双扩展给高速、大容量水声通信技术的发展带来严重挑战，因此对水声信道抽头衰减、时延、多普勒等参数的估计成为技术关键。本项目以申请人近年来有关水声信道估计的工作为基础，从水声信道的结构特征出发，结合声信号处理方法和无线通信的研究成果，研究具有簇稀疏结构特征的时变水声信道估计方法，重点研究水声信道簇稀疏特性建模的理论与方法、时延-多普勒参数模型的寻优算法、以及二维域估计算法的理论分析和实验验证。以上研究中的理论及方法的创新与突破，将可能为簇稀疏水声时变信道特性的高效获取与匹配开辟新的途径，对研究和开发高性能水声通信系统具有重要的学术意义和应用前景。

由于水下声信道复杂的多径、多普勒扩展及其时变特性，对精确估计信道特性带来巨大挑战。针对水下声信道的结构特点和时变特征，本项目从水声信道的结构特征出发，结合声信号处理方法和无线通信的研究成果，研究了适合具有簇稀疏结构特征的时变水声信道的估计方法，重点研究了水声信道簇稀疏特性建模的理论与方法、时延-多普勒参数模型的寻优算法、以及相关估计算法的理论分析和实验验证。通过突破上述研究取得的关键技术和方法，为获得水声信道特性开辟了新途径和新思路，本项目的研究成果对水声通信发展有重要的理论意义和实用价值。