华南理工大学学报(自然科学版) ›› 2022, Vol. 50 ›› Issue (12): 89-100.doi: 10.12141/j.issn.1000-565X.220040

所属专题: 2022年电子、通信与自动控制

• 电子、通信与自动控制 • 上一篇    下一篇

水声通信中稀疏信道均衡算法优化

陈芳炯1,2 刘明星1,3 付振华4 余华1,3   

  1. 1.华南理工大学 电子与信息学院,广东 广州 510640
    2.通信网信息传输与分发技术重点实验室,河北 石家庄 050081
    3.自然资源部海洋环境探测技术与应用重点实验室,广东 广州 510300
    4.广东省国土资源测绘院,广东 广州 510500
  • 收稿日期:2022-01-25 出版日期:2022-12-25 发布日期:2022-05-30
  • 通信作者: 陈芳炯(1975-),男,博士,教授,主要从事无线通信及组网技术研究。 E-mail:eefjchen@scut.edu.cn
  • 作者简介:陈芳炯(1975-),男,博士,教授,主要从事无线通信及组网技术研究。
  • 基金资助:
    国家自然科学基金资助项目(62271208);NSFC-浙江两化融合联合基金资助项目(U1809211)

Optimization of Sparse Channel Equalization Algorithm in Underwater Acoustic Communication

CHEN Fangjiong1,2 LIU Mingxing1,3 FU Zhenhua4 YU Hua1,3   

  1. 1.School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
    2.Science and Technology on Communication Networks Laboratory,Shijiazhuang 050081,Hebei,China
    3.Key Laboratory of Marine Environmental Survey Technology and Application,Ministry of Natural Resources,Guangzhou 510300,Guangdong,China
    4.Guangdong Institute of Land and Resources Surveying and Mapping,Guangzhou 510500,Guangdong,China
  • Received:2022-01-25 Online:2022-12-25 Published:2022-05-30
  • Contact: 陈芳炯(1975-),男,博士,教授,主要从事无线通信及组网技术研究。 E-mail:eefjchen@scut.edu.cn
  • About author:陈芳炯(1975-),男,博士,教授,主要从事无线通信及组网技术研究。
  • Supported by:
    the National Natural Science Foundation of China(62271208);the NSFC-Zhejiang Joint Fund for the Industrialization and Informatization(U1809211)

摘要:

为应对复杂的水声信道环境,提高信道均衡算法的收敛速度和误码率性能,文中提出了一种零值吸引稀疏控制成比例最小误码率判决反馈均衡算法。该算法在稀疏控制成比例最小误码率判决反馈均衡算法的基础上,通过在目标函数中加入近似l0范数的稀疏约束,迫使均衡算法在迭代过程中将幅值小的均衡器抽头向零值吸引,以加快均衡算法的初始收敛速度;同时在信道均衡过程中引入锁相环技术,以消除抖动相位噪声带来的影响。传统的锁相环技术都是基于最小均方误差准则的,但现有文献和相关实验仿真已经证明,当系统的均方误差最小时,误码率不一定最小。针对此问题,文中提出了一种基于最小误码率准则的锁相环相位追踪算法,并将其嵌入稀疏均衡算法中。在Matlab平台上,分别在实际采集的静态水声信道和实际时变水声信道条件下进行了实验,结果表明:加入近似l0范数约束的稀疏控制成比例最小误码率判决反馈均衡算法,在没有时变相位噪声影响下的收敛速度更快;在有时变相位噪声影响的信道条件下,基于最小误码率准则的锁相环相位追踪算法相较于基于最小均方误差准则的锁相环相位追踪算法,收敛速度更快,误码率性能更优。

关键词: 信道均衡, 稀疏性, 零值吸引, 锁相环, 最小误码率

Abstract:

In order to cope with the complex underwater acoustic channel environment and improve the convergence speed and symbol error rate performance of the channel equalization algorithm, this paper proposed a zero attraction sparse control proportional minimum symbol error rate decision feedback equalization algorithm. On the basis of the proposed sparse control proportional minimum symbol error rate decision feedback equalization algorithm, this algorithm added a sparse constraint of approximate l0 norm to the objective function, which pulls small amplitude equalizer taps toward zero. At the same time, phase-locked loop technology was introduced in the channel equalization process to eliminate the influence of jitter phase noise. The traditional phase-locked loop technology is based on the minimum mean square error criterion. However, existing literature and related experimental simulations have demonstrated that, when the mean square error of the system is the smallest, the symbol error rate is not necessarily the smallest. Aiming at this problem, a phase-locked loop phase tracking algorithm based on the minimum symbol error rate criterion was proposed and embedded in the sparse equalization algorithm. On the Matlab platform, experiments were carried out on the static underwater acoustic channel and the real time-varying underwater acoustic channel, respectively. The results show that the sparse control proportional minimum bit error rate decision feedback equalization algorithm with approximate l0 norm constraint converges faster without the influence of time-varying phase noise; under the channel condition affected by time-varying phase noise, the phase tracking algorithm based on the minimum bit error rate criterion has faster convergence speed and better bit error rate performance than the fragrance tracking algorithm based on the minimum mean square error criterion.

Key words: channel equalization, sparsity, zero attraction, phase-locked loop, minimum symbol error rate

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