文章摘要
宋军,刘平香,张刚强.基于分数阶傅里叶变换的水声信道参数估计[J].声学技术,2014,33(2):172~175
基于分数阶傅里叶变换的水声信道参数估计
Underwater acoustic channel parameters estimation based on fractional Fourier transform
投稿时间:2012-12-17  修订日期:2013-03-08
DOI:10.3969/j.issn1000-3630.2014.02.016
中文关键词: 水声信道估计  时延  多普勒频移  分数阶傅里叶变换
英文关键词: underwater acoustic channel estimation  time delay  Doppler frequency shift  fractional Fourier transform
基金项目:
作者单位E-mail
宋军 水声对抗技术重点实验室, 上海 201108
上海船舶电子设备研究所, 上海 201108 
sjfighting1989@163.com 
刘平香 水声对抗技术重点实验室, 上海 201108
上海船舶电子设备研究所, 上海 201108 
 
张刚强 水声对抗技术重点实验室, 上海 201108
上海船舶电子设备研究所, 上海 201108 
 
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中文摘要:
      准确估计水声信道参数,对提高通信系统的性能有着重要的意义。Chirp脉冲有良好的相关性,常被用作信道探测信号。鉴于分数阶傅里叶变换(Fractional Fourier Transform,FRFT)对chirp类信号的处理特性,用chirp信号作为测量信号,FRFT作为后端处理技术,可以得到很好的处理效果。研究了基于FRFT的水声信道多途时延和多普勒频偏参数估计的原理和方法,该方法通过发射具有正、负调频斜率的组合线性调频信号,在接收端根据FRFT幅值输出的峰值位置估计信道参数。仿真结果表明,此方法计算量与FFT相当,且有较高的估计精度。
英文摘要:
      Accurate estimation of the parameters of underwater acoustic channel is of importance in improving communication system's performance. Chirp pulse is usually used as the channel estimation signals as its outstanding correlation characteristic. Fractional Fourier Transform (FRFT) is well suited to process chirp signals. Consequently, it is an advisable approach of underwater acoustic channel estimation to take a chirp as the emitting signals and to adopt FRFT as the processing method of the received signals. The principle and method of estimating underwater acoustic channel multipath time-delay and Doppler shift are studied in this paper. Combined signal including two LFM signals with two contrary frequency modulation slopes is used as emitting signal, and then corresponding parameters are estimated according to the FRFT amplitude peaks of received signal. Simulation results indicate that the proposed method has similar amount of calculation as FFT, and high accuracy.
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