海洋时变声信道的二维Wigner-Ville谱

Two-dimensional Wigner-Ville spectrum of the linear rendom time-variant ocean channel

本文将海洋声传输信道考虑为线性随机时变信道,提出时变信道的二维Wigner-Ville谱并直接用来分析信道由于多途和起伏效应引起的时频衰落和扩展的联合统计特性或信道的时间-频移-频率-延迟的联合分布特性。文章还讨论了信道输出Wigner-Ville谱与输入Wigner-Ville谱和信道二维Wigner-Ville谱的关系,并以几种特殊信道为例作了说明。最后还就信道二维WV谱在检测中的应用进行了讨论,指出用线性调频信号作为检测信号的特点。

In this paper, the ocean acoustic channel is taken as a time-variant channel, and the two-dimensional Wigner-Ville spectrum (TDWVS) of the time-variant channel is used to analyse the conjoint time-shift-frequency-dalay distrubution or the fading and spread statistical characteristics of the channel. The relation between the output and input Wigner-Ville spectrums of the channel is discussed and some examples for the specific channel are shown. Finally, applications on the detection using the WVS and TDWVS are given. The advantage is obvious, when the signal is a linear frequency-modulated signal.