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The extremely long underwater channel delay spread causes severe inter-symbolinterference (ISI) for underwater acoustic communications. Passive timereversal processing (PTRP) can effectively reduce the channel time dispersionin a simple way via convolving the received packet with a time reversed probesignal. However the probe signal itself may introduce extra noise andinterference (self-correlation of the probe signal). In this paper, we proposea virtual time reversal processing (VTRP) for single input single output (SISO)Orthogonal Frequency Division Multiplexing (OFDM) systems. It convolves thereceived packet with the reversed estimated channel, instead of the probesignal to reduce the interference. Two sparse channel estimation methods,matching pursuit (MP), and basis pursuit de-noising (BPDN), are adopted toestimate the channel impulse response (CIR). We compare the performance of VTRPwith the PTRP and without any time reversal processing through MATLABsimulations and the pool experiments. The results reveal that VTRP hasoutstanding performance over time-invariant channels.

OFDM demodulation using virtual time reversal processing in underwater acoustic communication