水声信道中跳频通信系统设计与仿真

Design and Simulation of Frequency-Hopping Communication System in Underwater Acoustic Fading Channels

针对水声信道复杂多变和强多途等特点,建立了包括时变衰落、多途干扰和加性高斯白噪声干扰的水声信道模型,提出了一种基于非相干多频移键控(MFSK)调制的跳频通信系统方案(FH/MFSK),描述了其仿真实现过程,给出了其在瑞利衰落和莱斯衰落水声信道下系统性能的仿真结果,并对其进行了详细分析,为水声信道中FH/MFSK系统设计的参数选取和性能优化提供参考。结果表明,FH/MFSK水下通信系统可以有效克服多途干扰,对多普勒有一定的免疫性,可以实现可靠的水下通信。

According to the characteristics of time-varying and intensive multipath of underwater acoustic （UWA） channel, a UWA channel model with time-varying fading, multipath interference and additive white Gaussian noise （AWGN） is established. Based on the channel model, a UWA frequency-hopping communication system using noncoherent multi-frequency shift key （MFSK） modulation is designed, and the simulation methodology is described. Simulation results of the system performance under Rayleigh fading channel and Rician fading channel are achieved and analyzed to provide a reference for parameters selection and performance optimization of FH/MFSK system. The results show that the proposed communication system can effectively suppress the muhipath interference, and has certain immunity to Doppler spread, therefore reliable underwater acoustic communication can be implemented with the communication system.