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。
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.
出处
《声学技术》
CSCD
2009年第2期99-103,共5页
Technical Acoustics
关键词
多普勒补偿
固定频偏估计
OFDM水声通信
Doppler Effect compensation
frequency offset estimation
OFDM underwater acoustic communications
