快变水声信道中的单载波频域均衡技术研究

The fast time-varying characteristics of underwater acoustic channels have been the main bottleneck for the development of high-speed underwater acoustic communication. For the urgent requirement of marine resource development for reliable high-rate underwater acoustic communication, this project proposes a novel single-carrier frequency domain equalization method over fast time-varying underwater acoustic channels. This project will study the key technologies such as cluster sparse time-varying channel estimation, subblock processing for fast time-varying underwater acoustic channels, frequency domain iterative block decision feedback equalization with imperfect channel information. This project will verify and improve the proposed methods through the lake (sea) experimental, and further obtain a feasible method for practical application. The study of this project solves the problem of poor robustness of existing single-carrier frequency domain equalization methods in fast-changing underwater acoustic channels and achieves new breakthroughs in reliable high-speed underwater acoustic communication technologies. The research results can be used in the exploration and development of marine resources, underwater sensor networks and marine environment monitoring, and have certain reference and application values.

水声信道的快速时变特性一直是实现高速率水声通信发展的主要瓶颈。本项目密切结合我国海洋资源的开发与利用对高效可靠水声通信的迫切需求，开展快变信道下的单载波频域均衡技术研究；突破基于BEM模型的快变簇稀疏水声信道估计、快变信道情形下的子块均衡处理及存在信道误差情形下的频域块迭代判决反馈均衡等关键技术；开展湖(海)实验研究，验证并完善所提的方法，得到有实际应用价值的可行方法；解决现有单载波频域均衡方法在快变水声信道中稳健性差的问题，以期获得可靠高速水声通信技术的新突破。研究成果可用于我国海洋资源的探测开发、水下传感器网络及海洋环境监测等领域，具有一定的参考意义和应用价值。

针对现有单载波频域均衡方法在复杂快变水声信道中接收机性能较差的问题，本项目开展了快变信道下的单载波频域均衡技术研究理论方法研究。深入研究了簇稀疏快变水声信道估计、快变信道情形下的子块均衡处理及存在信道误差情形下的频域块迭代判决反馈均衡方法。重点研究了基于PN的单载波频域均衡方法，主要包括: 1)提出一种自适应稀疏贝叶斯信道估计方法；2）提出一种基于子块的单载波频域均衡方法；3) 提出一种自适应频域均衡方法；4)提出一种基于自适应频域Turbo均衡方法。利用湖上实验数据来验证并完善了所提出的部分理论和方法，给出有应用价值的可行方法。在本项目的资助下，共发表论文18篇，其中期刊论文 13 篇，会议论文 5 篇，（SCI索引11篇，EI索引6篇），共申请专利2项，授权1项，受理1项。该项目的研究成果可用于我国UUV、水下传感器网络及海洋环境监测等领域。