| 水声通信加权反馈双向Turb均衡器 |
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| 引用本文： | 王凯,吴立新,张雪冬,张仁和.水声通信加权反馈双向Turb均衡器[J].声学学报,2021,46(6):835-846. |
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| 作者姓名： | 王凯 吴立新 张雪冬 张仁和 |
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| 作者单位： | 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; |
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| 基金项目： | 中国科学院声学研究所率先计划项目(SXJH201601)资助 |
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| 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。
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| 关 键 词： | 水声通信自适应Turbo均衡器 水声信道均衡 双向软判决反馈均衡器 水声通信后验软判决 |
| 收稿时间： | 2021-02-24 |
Bidirectional turbo equalizer with weighted feedback for underwater acoustic communication |
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| Affiliation: | 1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190;2. University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | 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. |
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