一种面向水下移动通信的组合差分扩频水声通信方法  

Combination Differential Direct Sequence Spread Spectrum Algorithm for Mobile Underwater Acoustic Communication

作　　者：胡耀辉 韩树平[1] 刘建波 张奇 张延厚 HU Yaohui;HAN Shuping;LIU Jianbo;ZHANG Qi;ZHANG Yanhou(Naval Submarine Academy,Qingdao 266199,China;Unit 92020 of PLA,Qingdao 266071,China;Unit 91323 of PLA,Jiyuan 454650,China)

机构地区：[1]海军潜艇学院,青岛266199 [2]中国人民解放军92020部队,青岛266071 [3]中国人民解放军91323部队,济源454650

出　　处：《电子与信息学报》2022年第6期2024-2034,共11页Journal of Electronics & Information Technology

摘　　要：针对水下移动平台(AUVs)直接序列扩频(DSSS)水声通信过程中大多普勒时变带来的频偏及载波相位跳变问题,该文提出一种组合差分扩频通信方法。该方法设计一种2维组合差分(TCD)扩频帧结构,接收端通过对重复码时域加窗相关实现时变多普勒粗估计;接收端提出一种频率压缩-能量接收器(FC-ED),通过采用能量检测接收器提高接收端处理多普勒容限,使用频率压缩法多频点压缩处理进一步提高系统鲁棒性,实现扩频码识别映射解码;最后提出一种组合差分算法,实现2维组合扩频间的极性差分解码,在能量接收映射解码基础上引入极性调制,进一步提高频谱利用率。经理论及仿真试验分析,该方法具备一定的抗时变多普勒能力,在恒加速度相对运动–8 dB信噪比条件下误码率小于10^(–2)。To deal with the problem of frequency offset and carrier phase fluctuation caused by the conventional Doppler on the DSSS(Direct-Sequence Spread-Spectrum)underwater acoustic communication between AUVs(Autonomous Underwater Vehicles),a combination differential direct sequence spread spectrum algorithm is proposed.The Doppler rough estimation is realized through Two-dimension Combination Difference(TCD)spread spectrum frame structure,and the Doppler tolerance is extended through the Frequency Compression-Energy Detector(FC-ED),then an algorithm of combination differential is proposed for polarity decoding.Using the combination differential direct sequence spread spectrum algorithm,good performance(BEK<10^(–2))is achieved for a signal-to-noise ratio as low as–8 dB based on at-sea data.

关 键 词：水声通信 组合差分扩频 能量检测接收器 

分 类 号：TN929.3[电子电信—通信与信息系统] TB56[电子电信—信息与通信工程]