强多径干扰下多载波水声通信均衡算法仿真  

Multi-carrier underwater acoustic communication equalization algorithm simulation under strong multipath interference

作　　者：黎伟强[1] 倪志平[1] LI Wei-qiang;Ni Zhi-ping(Lushan College of Guangxi University of Science and Technology,Liuzhou Guangxi 545616,China)

机构地区：[1]广西科技大学鹿山学院

出　　处：《计算机仿真》2019年第8期174-177,186,共5页Computer Simulation

基　　金：2017广西高校中青年教师科研基础能力提升项目:基于Zigbee无线传感器网络的森林火灾监测系统研究与应用(2017KY1385)

摘　　要：当前方法存在水下通信误码率较高、信道跟踪误差较大、信道均衡效果不佳的问题,提出了基于递归最小二乘的强多径干扰下多载波水声通信均衡算法,建立时变衰落、强多径干扰多载波水声通信信道模型,采用LMS算法调节信道模型中均衡器的抽头系数,以保证通信均衡的剩余误差值最小,同时采用输入的水声通信信号与期望输出信号的误差平方的加权平均和作为均衡器抽头系数的误差函数,对接收通信信号进行跟踪补偿,抑制强多径传输带来的通信信号码间干扰,实现强多径干扰下多载波水声通信均衡。仿真结果表明,所提算法大大降低了水下通信误码率,减小了水下通信信道跟踪误差,同时较好地抑制了强多径干扰噪声的影响,补偿了水下通信信道的变化。This article presents an equalization algorithm for multi-carrier underwater acoustic communication with strong multipath interference based on recursive least square. Firstly, we establish a time-varying fading, strong multipath interference and multi-carrier underwater acoustic communication channel model. Secondly, we use LMS algorithm to adjust the tap coefficients of equalizer, so as to ensure the minimum residual error of communication equalization. At the same tim e, we use the weighted average sum between input underwater acoustic communication signal and the error square of expected output signal as the error function of tap coefficient of equalizer to track and compensate the received communication signal, and thus to suppress the interference among communication signal codes caused by strong multipath transmission. Thus, we achieve the equalization of multi-carrier underwater acoustic communication under strong multi-path interference. Simulation results show that the proposed algorithm can greatly reduce the bit error rate of underwater communication and the tracking error of underwater communication channel. Meanwhile, this method restrains the influence of strong multipath interference noise and compensates the change of underwater communication channel.

关 键 词：强多径干扰 多载波 水声通信 均衡 递归最小二乘 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]