【摘要】 回顾了水声信道的特性,针对其复杂多变和强多途特点,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。在此基础上设计了一种采用非相干FSK调制的水下跳频通信系统(FH/MFSK),描述了其仿真实现过程,给出了在不同水声信道条件下的系统性能仿真结果,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奠定了基础。结果还表明FH/MFSK水下通信系统可以有效克服多途干扰,实现可靠的水下通信。更多还原

【Abstract】 The characteristics of UWA (Underwater Acoustic) channel was overviewed, and a UWA channel model concluding the time-varying fading, multipath interference and AWGN (Additive Gaussian White Noise) was established. Based on the model, a UWA frequency-hopping communication system using noncoherent FSK modulation was designed, the simulation method was described and the simulation results of the system’s performance under different channel conditions were provided and particularly analyzed, which built the foundation for the FH/MFSK system’s parameters selection and performance optimization. The simulation results also demonstrate that this kind of communication system can effectively overcome the multipath interference and has high reliability.更多还原