浅水时变多途信道特性分析与模型实验研究

Shallow water time-varying multipath channel characteristic analysis and model amendment

时变多途水声信道是影响水声通信性能的一个重要因素,深入了解水声信道挣性并对水声信道进行建模具有重要的研究意义。本文在分析传统时变信道模型基础上,从时域角度出发,提出采用AR(ρ)模型对已有的浅水时变多途信道模型中的小尺度衰落分量进行修正。然后基于莲花湖实测信道数据,分析了时变信道各个路径的幅度、时延、时间相干系数、系统传递函数等特性,并对修正模型进行了验证正。从仿真结果来看,修正模型与试验结果拟合的很好。本文从多个方面对水声信道特性进行了分析,有助于对水声信道的深入了解,同时为水声通信系统性能评估提供了一种仿真信道模型。

Time-varying multipath underwater acoustic channel is an important influence factor for underwater acoustic communication system. It is of great significance to understand the characteristics of underwater acoustic channel and to model the underwater acoustic channel. First, the existing shallow water time-varying channel model was analyzed,and then from perspective of time domain, the small scale parameter of the channel is modified by AR(p) model. The characteristics of amplitude, delay, time coherence coefficient and system function of each path were analyzed using the real collected data from Lianhua Lake in Heilongjiang, China. The simulation results shows that the modified model has a good agreement with the experimental results. The characteristics of underwater acoustic channel were analyzed from many aspects which can help to understand the underwater acoustic channel, and provide a simulation channel model for the performance evaluation of underwater acoustic communication system.