2017240-1
研究与开发
水声通信系统中基于迭代自适应的脉冲噪声抑制方法
周桂莉,李有明,余明宸,王晓丽
(宁波大学信息科学与工程学院,浙江 宁波 315211)
摘 要:针对水声通信系统中脉冲噪声抑制问题,提出了一种迭代自适应的脉冲噪声抑制方法。基于 OFDM
子载波之间的正交性,该方法首先利用空子载波矩阵从接收信号中提取出背景噪声和脉冲噪声。然后,利用
空子载波矩阵构造导频矩阵,得到脉冲噪声的干扰协方差矩阵,并在加权最小二乘准则下通过对代价函数的
求解得到脉冲噪声的闭式解。最后,在接收信号中减去脉冲噪声的估计值,完成对脉冲噪声的抑制。仿真结
果表明,本文方法有效降低了水声通信系统的误码率,且在高信干噪比下性能提升更加明显。
关键词:水声通信;脉冲噪声;迭代自适应方法
中图分类号:TN929.3 文献标识码:A
doi: 10.11959/j.issn.1000−0801.2017240
Impulsive noise mitigation based on iteration adaptive
approach in underwater acoustic communication
ZHOU Guili, LI Youming, YU Mingchen, WANG Xiaoli
College of Information Science and Engineering, Ningbo University, Ningbo 315211, China
Abstract: Focusing on the impulsive noise mitigation in underwater acoustic communication, an impulsive noise mi-
tigation method based on iteration adaptive approach was proposed. Firstly, by utilizing the orthogonality of the sub-
carriers in OFDM system, both the impulsive noise and background noise were separated from the signals. Then null
tones matrix was used to construct a steering matrix and get the impulsive noise interference covariance matrix. Fur-
thermore, a cost function based on weighted least squares approach was proposed and a close form expression for the
impulsive noise was derived. Finally, the impulsive noise was mitigated by substracting the estimation of the impulse
noise in the received signal. Simulation results show that the proposed algorithm can reduce the bit error rate (BER)
efficiently and provide better performance, especially in high signal to impulsive noise ratio (SINR) case.
Key words: underwater acoustic communication, impulsive noise, iteration adaptive approach
收稿日期:2017−06−14;修回日期:2017−07−31
基金项目:国家自然科学基金资助项目(No.61571250);宁波市自然科学基金资助项目(No.2015A610121);宁波大学研究生
科研创新基金资助项目
Foundation Items: The National Natural Science Foundation of China (No.61571250), Ningbo Natural Science Foundation of Chin
(No.2015A610121), The Scientific Research Foundation of Graduate School of Ningbo University