水声通信加权反馈双向Turb均衡器  

Bidirectional turbo equalizer with weighted feedback for underwater acoustic communication

作　　者：王凯 吴立新[1,2] 张雪冬 张仁和 WANG Kai;WU Lixin;ZHANG Xuedong;ZHANG Renhe(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《声学学报》2021年第6期835-846,共12页Acta Acustica

基　　金：中国科学院声学研究所率先计划项目(SXJH201601)资助。

摘　　要：为了提升自适应双向Turbo均衡器的收敛速度及降低误比特率,提出了采用加权反馈的双向Turbo均衡算法。首先在单个均衡器反馈输入中采用后验均值与先验均值混合的反馈方案,有效提升一轮迭代中均衡器输出的准确性;其次通过后验均值与先验均值的加权合并作为另一均衡器反馈的非因果项输入,在提升反馈输入准确性的同时提升了数据的利用率;最后在权值迭代中采用优化的比例归一化最小均方算法,提升训练阶段均衡器收敛速度。千岛湖试验中,在同样3.75 kbps通信速率的情况下,该方法误比特率仅为传统双向Turbo均衡器的1/3。仿真和试验数据表明,均衡器要达到同样的误比特率,本方法所需迭代轮数更少,在时变信道中系统稳定性更好,误比特率更低,提升了水声通信效率。In order to improve the convergence speed and reduce the bit error rate of adaptive bidirectional turbo equalizer,a weighted feedback bidirectional turbo equalization algorithm is proposed.Firstly,a hybrid feedback scheme of posterior mean and prior mean is used in a single equalizer feedback input to improve the accuracy of equalizer output in each iteration;secondly,the weighted combination of a posteriori mean and a priori mean is used as the non-causal input of another equalizer feedback,which improves the accuracy of feedback input and the utilization of data;finally,the optimized normalized least mean square algorithm is used in weight iteration to improve the convergence speed of equalizer in training phase.In the Qiandaohu experiment,the bit error rate of the proposed method is only 1/3 of that of the traditional bidirectional turbo equalizer at the same 3.75 kbps communication rate.The simulation and experimental data show that this method needs less iterations to achieve the same bit error rate,and has higher stability in time-varying channel,and can achieve lower bit error rate.

关 键 词：TURBO均衡 误比特率 水声通信 归一化最小均方算法 时变信道 均衡器 通信速率 系统稳定性 

分 类 号：TN929.3[电子电信—通信与信息系统] TN715[电子电信—信息与通信工程]