水声宽带信号的多普勒补偿-声学技术.PDFVIP

第 28 卷第 2 期 声 学 技 术 Vol.28, No.2 2009 年 4 月 Technical Acoustics Apr., 2009 水声宽带信号的多普勒补偿 1,2 1 1 1 黄建纯 ，郭圣明 ，郭中源 ，陈 庚 (1 中国科学院声学研究所水声环境特性实验室，北京 100190 ；2 中国科学院研究生院，北京 100190) 摘要：当收发平台相对运动时，水声信道表现出明显的多普勒效应。多普勒效应会引起接收信号频率的偏移，对宽 带信号来说，频率偏移值随频率的大小变化，不能简单地用固定频偏进行补偿。选用 OFDM 信号作为对象，对水声 宽带信号的多普勒补偿进行研究，基于 Sharif 的研究提出了改进算法，分两步进行补偿。仿真结果表明了算法的可 行性，并通过对海试数据的处理进行试验验证。 关键词：多普勒补偿；固定频偏估计；OFDM 水声通信 中图分类号：TB556 文献标识码：A 文章编号：1000-3630(2009)-02-0099-05 DOI 编码：10.3969/j.issn1000-3630.2009.02.001 Doppler compensation on underwater acoustic wideband signals 1,2 1 1 1 HUANG Jian-chun , GUO Sheng-ming , GUO Zhong-yuan , CHEN Geng (1. Laboratory of Underwater Acoustic Environment, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100190, China) Abstract: When platforms move during underwater acoustic communications, Doppler Effect which introduces frequency offset in received signals needs to be considered. The values of frequency offset for wideband signals vary with different frequency components, and cannot be represented as a constant value. Based on the study of OFDM signals, the problem on Doppler compensation of underwater acoustic wideband signals is studied in this paper. An improved algorithm which compensates Doppler Effect in two steps is presented. Simulations and a sea trial are carried out to testify the algorithm. Key words :Doppler Effect compensation; f