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OFDM Demodulation Using Virtual Time Reversal Processing in Underwater Acoustic Communications

Yanling Yin

College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China

E-mail Address: yinyanling@hrbeu.edu.cn

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Songzuo Liu

College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China

E-mail Address: liusongzuo@hrbeu.edu.cn

Corresponding author.

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Gang Qiao

College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China

E-mail Address: qiaogang@hrbeu.edu.cn

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Yue Yang

College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China

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, and

Yue Yang

Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA

E-mail Address: yueyang@uw.edu

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https://doi.org/10.1142/S0218396X15400111Cited by:10 (Source: Crossref)

Abstract

The extremely long underwater channel delay spread causes severe inter-symbol interference (ISI) for underwater acoustic communications. Passive time reversal processing (PTRP) can effectively reduce the channel time dispersion in a simple way via convolving the received packet with a time reversed probe signal (PS). However, the PS itself may introduce extra noise and interference (self-correlation of the PS). In this paper, we propose a virtual time reversal processing (VTRP) for single input single output (SISO) orthogonal frequency division multiplexing (OFDM) systems. It convolves the received packet with the reversed estimated channel, instead of the PS to reduce the interference. Two sparse channel estimation methods, matching pursuit (MP), and basis pursuit denoising (BPDN), are adopted to estimate the channel impulse response (CIR). We compare the performance of VTRP with the PTRP and without any time reversal processing through MATLAB simulations and the pool experiments. The results reveal that VTRP has outstanding performance over time-invariant channels.

Keywords:

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