【作者】 徐立军； 鄢社锋； 鹿鑫； 栾亦夫；

【Author】 XU Li-jun;YAN She-feng;LU Xin;LUAN Yi-fu;The Institute of Acoustics of the Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【机构】 中国科学院声学研究所； 中国科学院大学；

【摘要】 针对水声信道低带宽和双扩展特性,提出了一种水下多用户通信过程中,信号同步波形设计方法,通过该方法使接收端能够在同一频带内对多个用户的通信信号识别,该方法研究了伪随机Gold序列和线性调频信号在水声信道下的时域和频域双扩展特性,设计了采用Gold序列调制线性调频信号的同步波形,使得接收端能够在一定信噪比条件下识别水下多个移动节点的通信信号。文中通过信道多途模型对七个用户在不同移动速度和不同时延信号叠加条件下进行了仿真,仿真结果表明该方法在一定信噪比条件下,该方法能够实现对多个用户信号识别。更多还原

【Abstract】 A synchronous signal of multi-user underwater communication design method is proposed for the limited bandwidth and double spreading underwater channels. Multi-user signals with same bandwidth can be identified in receiver by this method. The time and frequency spreading characteristics of Gold sequence and Chirp signal in underwater channels is studied, and Gold-sequence-modulated Chirp signal is designed as synchronous signal. And then the receiver can identify multi communication signals from underwater mobile nodes with specified SNR. This paper simulates superposition of seven users with different delay and speed in multipath channel model. And the simulation result shows this method can identify multi-user signals with specified SNR.更多还原