Design and implementation of OFDM acoustic modem for underwater communication

Hsien-Sen Hung,Chih-Ling Wei,Chiu, L.,Chi-Fang Chen

Taipei（2014）

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摘要

This paper is aimed to develop a low-complexity receiver by treating Doppler rate (phase offset) as nuisance parameter in the hybrid channel estimation. For slowly changing channels, two simple adaptive equalization schemes, based on least squares (LS) and minimum mean-squared error (MMSE) principles, are proposed. For fast-changing channels, we adopt pilot-based channel estimation for equalization. We show the bit-error-rate (BER) performance of the OFDM detectors over a set of measured channel impulse responses in the northeastern sea of Taiwan. Simulation results reveal that adaptive equalizers and pilot-based equalizer can perform quite well in calm and fast-changing channel conditions respectively.

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关键词

doppler effect,ofdm modulation,acoustic receivers,adaptive equalisers,channel estimation,error statistics,least mean squares methods,modems,transient response,underwater acoustic communication,ber,doppler rate,ls principle,mmse principle,ofdm acoustic modem implementation,ofdm detector,taiwan northeastern sea,adaptive equalization scheme,adaptive equalizer,bit error rate,channel impulse response,fast-changing channel condition,hybrid channel estimation,least squares principle,low-complexity receiver,minimum mean-squared error principle,nuisance parameter,pilot-based channel estimation,underwater communication,multicarrier modulation,orthogonal frequency division multiplexing (ofdm),ofdm,frequency response,simulation

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