Affiliations: [a]
Institute of Acoustics, Chinese Academy of Sciences, Beijing, P.R. China
| [b]
University of Chinese, Academy of Sciences, Beijing, P.R. China
Correspondence:
[*]
Corresponding author. Haining Huang, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China. E-mail: hhn@mail.ioa.ac.cn.
Abstract: To overcome disadvantages of conventional Doppler estimation and compensation for non-stationary underwater platforms, a novel algorithm based on joint time-frequency searching is proposed to track and rapidly compensate the time-variant Doppler factor in underwater acoustic OFDM (Orthogonal Frequency Division Multiplexing) communication. The algorithm utilizes the comb pilot’s subcarriers combined with frequency-domain resampling to calculate the channel impulse response under different Doppler factors. Then the correct Doppler factor is achieved and eliminated by seeking the sparest channel impulse response, which is accessed using compressed sensing method. Experiment results obtained by Monte Carlo simulation and sea-trial in shallow-water are provided, demonstrating that the new algorithm can effectively track and rapidly compensate the time-variant Doppler factor, thus ensuring the stable underwater acoustic OFDM mobile communication for non-stationary underwater platforms.
Keywords: Underwater acoustic communication, orthogonal frequency division multiplexing, time-variant Doppler tracking, Doppler fast compensation
