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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。
Channel equalization is one of the key technologies to overcome inter-symbol interference in high-speed underwater acoustic communication systems. How to improve the performance of equalizers is a hot issue currently studied. Aiming at the time-varying Doppler characteristic of underwater acoustic channel, based on the analysis of channel model and structural characteristics of blind equalizer, a variable-length constant-modulus algorithm for time-dependent decorrelation is proposed. The algorithm is simulated and tested analysis. The results show that the improved algorithm can effectively overcome the inter-symbol interference effect in actual underwater acoustic communication, has faster convergence speed and smaller residual error, and improves the validity and reliability of shallow marine acoustic communication. It has wide application prospect in engineering .