内嵌数字锁相环的自适应空时联合均衡器在水下高速数字通信中的应用研究

Research of adaptive spatio-temporal DFE with embedded DPLL in high-speed underwater digital communication

为了克服水下信道严重的时变多途干扰和衰落对水下通信的影响,提高水下通信的作用距离和可靠性,在水下高速数字通信中对内嵌数字锁相环(digital phase-locked loop,DPLL)的自适应空时DFE(判决反馈均衡器)进行了研究和分析,给出了这种自适应空时判决反馈均衡器中各种算法和参数条件下的仿真结果.并给出了采用这种自适应空时判决反馈均衡器的水下通信系统的湖水试验结果,结果表明这种均衡器是可行和有效的.

In order to decrease the major influences of time-varying multipath and fading in underwater channels and increase the transmit distance and reliability of an underwater communications system, research and analysis were done on an adaptive spatio-temporal decision feedback equalizer （DFE） with an embedded digital-phaselocked-loop （DPLL） in a high-speed underwater digital communications system. Proposed emulation results are provided for different algorithms and parameters of this adaptive spatio-temporal DFE. Results from experiments in a lake prove that the equalizer algorithm is workable and effective in a high-rate underwater wireless communications system.