空间分集均衡水声通信技术的研究与仿真

Study and simulation of spatial diversity equalization in underwater communication

水声信道中的衰变多途特性使得水声数字通信比较困难,常引起难以克服的码间干扰(ISI),为改善系统性能、减少误码率,对空间分集均衡技术(SDE)进行了研究讨论,将决策反馈均衡与空间分集技术相结合,给出了空间分集均衡器的结构,在理论上证明了该方法的有效性,并讨论了LMS和RLS算法的优缺点,对传统的均衡技术与空间分集技术的性能进行了对比,并通过计算机仿真来验证该方法可降低传输系统的误码率,从而提高水下通信的可靠性.

The fading and multipath underwater acoustic channels have always been great impediments to building reliable underwater communication systems. In order to improve the system performance and decrease the error probability the spatial diversity equalization (SDE) is studied. The decision feedback equalization (DFE) is combined with the spatial diversity that is often used in the radio. The configuration of the spatial diversity equalizer is presented.The validity of the method is proved theoretically. The advantage and disadvantage of the LMS and RLS algorithm are discussed, the corresponding performances are compared, and the computer simulation is used to testify the ability of this method to suppress ISI. The result shows that this method can decrease the error probability effectively and improve the reliability of the underwater communication system.