基于频域变采样的OFDM水声移动通信多普勒补偿算法

针对正交频分复用技术(Orthogonal Frequency Division Multiplexing,OFDM)在水声移动通信条件下存在对多普勒频偏敏感的缺陷,提出了一种基于频域变采样技术的多普勒补偿算法。利用移动通信条件下OFDM子载波正交性不变的特点,通过频域变采样实现对多普勒的快速补偿,并采用编码反馈校验技术跟踪系统多普勒变化,达到了OFDM移动通信条件下实时通信的目的。仿真和水池实验结果证实:频域变采样多普勒补偿算法不仅可以实时地跟踪通信载体运动变化,快速补偿多普勒,同时大幅降低了时域变采样多普勒补偿算法的计算量,降低了通信系统硬件平台复杂度。

Doppler compensation of using frequency domain re-sampling in underwater acoustic mobile OFDM communication

To overcome the disadvantage of OFDM signal''s Doppler sensitivity, a Doppler compensation algorithm based on frequency domain re-sampling technique is proposed for mobile OFDM underwater acoustic communication system. Taking the advantage of subcarriers orthogonal invariance, frequency domain re-sampling technique is adopted to realize quick Doppler compensation, and cyclic code check technique is used to chasing the variety of Doppler shift. Experimental results from numerical simulation and tank-trial demonstrate that the proposed algorithm can effectively estimate and compensate Doppler shift, significantly decrease the calculation amount and reduce the complexity of hardware platform.