Underwater communications in time-varying sparse channels using passive-phase conjugation

Authors:  Guosong Zhang, Hefeng Dong

Abstract:
Passive-phase conjugation (PPC) achieves the pulse compression for the time delayed arrivals. This property has been used in underwater acoustic communications. In a time-varying channel, the temporal focusing degrades with time evolution. The block-based approach is implemented to avoid the impact of channel variations. The basic idea is that the channel is assumed constant within each block of a short time interval, and the channel is updated using detected symbols in the previous block. Using real data collected in a recent sea trial, this paper investigates: (1) the communications using PPC processing, where the block-based approach is used, (2) the matching pursuit (MP) algorithm exploiting the channel sparseness. It is found that the MP algorithm improves performance of the communications using PPC processing.

Keywords:
Passive-phase conjugation
Matching pursuit
Underwater acoustic communication
Time reversal

Published in: Applied Acoustics (Volume 74, Issue 3, March  2013)

Publisher: Elsevier

ISSN Information: 0003-682X

Underwater communications in time-varying sparse channels using passive-phase conjugation

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