一种AUV移动OFDM水声通信系统设计

摘要

For the serious effects of inter-carrier interference(ICI) and inter-symbol interference(ISI) caused by the multipath and Doppler shift on mobile orthogonal frequency division multiplexing(OFDM) underwater acoustic communication in underwater acoustic channel, the time-frequency differential coding, cross-correlation function and resample with variable sampling rate are adopted to resist the Doppler effect. Subsequently, a low-complexity mobile OFDM underwater acoustic communication system, which is easily implementable in engineering, is designed for an autonomous undersea vehicle(AUV). The communication system can avoid the residual Doppler compensation effectively, and it shows a certain degree of robustness to multipath channel. Sea trial results show that the system can work normally under shallow sea channel with complex multipath and certain Doppler effect, and realize mobile OFDM underwater acoustic communication.%针对水声信道多径效应和多普勒频偏对移动正交频分复用(OFDM)水声通信产生的严重载波间干扰(ICI)和码间干扰(ISI)采用时频差分编码方案,互相关函数方法进行多普勒估计,变采样率重采样进行多普勒补偿,设计并实现了一种面向自主式水下航行器(AUV)的、易于工程实现的低复杂度移动OFDM水声通信系统.该系统能够有效避免残余多普勒补偿的问题,同时对多径信道表现出一定程度的稳健性.海试结果表明,该系统可在浅海信道复杂多径和一定多普勒影响的条件下正常工作,实现了移动OFDM水声通信.