王巍,尹艳玲,刘凇佐,王玥,乔钢.基于频域变采样的OFDM水声移动通信多普勒补偿算法[J].声学技术,2013,32(1):54~58 |
基于频域变采样的OFDM水声移动通信多普勒补偿算法 |
Doppler compensation of using frequency domain re-sampling in underwater acoustic mobile OFDM communication |
投稿时间:2012-03-01 修订日期:2012-06-24 |
DOI:10.3969/j.issn1000-3630.2013.01.013 |
中文关键词: 水声通信 正交频分复用 多普勒补偿 编码反馈校验 频域变采样 |
英文关键词: underwater acoustic communication Orthogonal Frequency Division Multiplexing (OFDM) Doppler compensation cyclic code check frequency domain re-sampling |
基金项目:国家863计划资助项目(2009AA093601-2);国家自然科学基金(11274079);国防科学技术工业委员会基础研究基金资助项目(B2420110007) |
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中文摘要: |
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。 |
英文摘要: |
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. |
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