Page 119 - 《应用声学》2021年第2期

第 40 卷 第 2 期 Vol. 40, No. 2
2021 年 3 月 Journal of Applied Acoustics March, 2021

⋄ 研究报告 ⋄

OFDM水声通信CS限幅失真补偿与LS信道估计

优化算法 ∗

郭铁梁 李志军 † 张文祥

(梧州学院电子与信息工程学院 梧州 543002)

摘要：正交频分复用技术应用于水声通信系统时，会引起较高的峰均比，当采用限幅法对峰均比进行抑制时，
会产生非线性失真。另外，系统采用最小二乘法进行信道估计受噪声的影响较大。针对以上问题，提出了一种
基于压缩感知技术的补偿限幅非线性失真与最小二乘信道估计相组合的新算法，在接收端利用导频数据采用
压缩感知算法对限幅失真进行补偿，同时对最小二乘信道估计进行优化运算，以减小噪声对其影响。理论分析
和仿真结果均表明，新算法不但能够有效抑制限幅法造成的系统非线性失真问题，而且能够降低高斯白噪声
对于信道估计的影响。
关键词：水声通信；正交频分复用；峰均比；压缩感知；信道估计
中图法分类号: TN929.3 文献标识码: A 文章编号: 1000-310X(2021)02-0287-07
DOI: 10.11684/j.issn.1000-310X.2021.02.017

Optimization algorithm on CS clipping distortion compensation and LS channel

estimation for OFDM underwater acoustic systems

GUO Tieliang LI Zhijun ZHANG Wenxiang

(College of Electronics and Information, Wuzhou University, Wuzhou 543002, China)

Abstract: Orthogonal frequency division multiplexing (OFDM) technology leads to a higher peak to average
power ratio (PAPR) in underwater acoustic (UWA) channel. When the clipping method was used to restrain
PAPR, the nonlinear distortion is produced. In addition, the least square (LS) method used is greatly affected
by noise for channel estimation in the system. To solve the above problems, this paper proposes an optimization
algorithm based on compression sensing (CS) about the nonlinear distortion of clipping and the noise of the LS
method. Combined with CS algorithm, pilot data are used to reduce clipping noise in the receiver, and the LS
channel estimation is optimized simultaneously. Theoretical analysis and simulation results indicate that the
new algorithm can effectively restrain the nonlinear distortion for UWA communication systems. Moreover,
the effect of Gaussian white noise on channel estimation can be reduced.
Keywords: Underwater acoustic communication; Orthogonal frequency division multiplexing; Peak to
average power ratio; Compression sensing; Channel estimation

2020-07-27 收稿; 2020-10-21 定稿
梧州市科学研究与技术开发计划项目 (201902035, 201902038), 梧州学院校级科研项目 (2018A005, 2018A006, 2018A007)
∗
作者简介: 郭铁梁 (1971– ), 男, 黑龙江哈尔滨人, 博士, 副教授, 研究方向: 水声通信。
† 通信作者 E-mail: 292905400@qq.com