一种用于多径衰落水声信道的盲均衡算法研究

摘要

信道均衡是现今高速水声通信系统中克服码间干扰一项关键技术，如何提高均衡器的性能是目前研究的热点课题。针对水声信道的时变多普勒特性，在分析信道模型及盲均衡器结构特点的基础上，提出了一种时域解相关的变步长恒模算法，并对算法进行了仿真及试验分析。结果表明改进算法能够有效克服实际水声通信中的码间干扰效应，具有更快的收敛速度和更小的剩余误差，提高了浅海水声通信的有效性和可靠性，具有广阔的工程应用前景。%The equalization of channels is a key technique for conquering ISI in modern underwater acous-tics communication system,and how to improve the performance of equalizers becomes a hot topic. Towards to the time-varying Doppler underwater acoustic channel and based on analysis of the structure characteris-tics of the channel model and the blind equalizer, the paper proposes an algorithm of variable step size re-lated constant modulus algorithm and makes an analysis of the algorithm simulation and test. The results indicate that the improved algorithm can effectively overcome the practical underwater acoustic communica-tion inter-symbol interference effect, and has the faster convergence speed and smaller residual error, thus to improve the effectiveness and reliability of the shallow water acoustic communication, and then would have a wide application prospect.