差分混沌移位键控在水声通信中的应用

doi:10.11959/j.issn.1000-0801.2019217

摘要/Abstract

摘要：

水声信道作为目前已知最严酷、最复杂的无线通信信道之一，具有强多途干扰、时—频率双扩展、高噪、带宽窄等特征。水声信道的时变特性，使得估计与跟踪信道很困难，因此，研究无需信道估计与均衡的非相干稳健水声通信调制方法具有重要的意义。首先介绍了基于正交频分复用（OFDM）和扩频调制的水声调制技术的研究进展，然后，分析了差分混沌移位键控在水声信道下的可行性，提出了两种基于OFDM的多载波差分混沌移位键控方案，给出两个方案的调制解调器原理。在时—频双扩展信道和水声信道下，对两个方案进行了性能仿真和分析。性能结果表明所提出的方案在水声信道下具有良好的稳健性。

关键词: 水声通信, 多载波差分混沌移位键控, 正交频分复用, 稳健性

Abstract:

As the most stringent and complicated channel,underwater acoustic (UWA) channels are featured by high multipath interference,time-frequency doubly spread,high noise,and narrow bandwidth.Due to time varying of underwater acoustic,it is difficult to trance and estimate channel state information (CSI).The underwater acoustic communication techniques based on orthogonal frequency division multiplex (OFDM) and spread spectrum were reviewed.Then,the characteristic of differential chaos shift keying (DCSK) was analyzed,and two multicarrier differential chaos shift keying modulations were proposed.Finally,over time-frequency doubly spread channel and underwater acoustic channel,the bit errors rate (BER) performances for two proposed schemes were presented and analyzed.Numerical results show that the proposed schemes own good robustness over underwater acoustic channels.

Key words: underwater acoustic communication, multicarrier differential chaos shift keying, orthogonal frequency division multiplex, robustness

中图分类号:

TN911

代红英,陈梦蕾,徐位凯. 差分混沌移位键控在水声通信中的应用[J]. 电信科学, 2019, 35(9): 69-84.

Hongying DAI,Menglei CHEN,Weikai XU. Underwater acoustic communications based on differential chaos shift keying[J]. Telecommunications Science, 2019, 35(9): 69-84.

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仿真参数	取值
发射端距离底部距离	20 m
接收端距离底部距离	50 m
水中的声速	1 500 m/s
海底的声速	1 200 m/s
仿真信道时间长度	180 s
时间分辨率	0.05 s
频率分辨率	25 Hz
发射端与接收端水平距离(UWA_I)	1 000 m
中心频率(UWA_I)	15 kHz
带宽(UWA_I)	10 kHz
发射端与接收端水平距离(UWA_Ⅱ)	5 000 m
中心频率(UWA_Ⅱ)	1.5 kHz
带宽(UWA_Ⅱ)	400 Hz