Joint passive time reversal and multichannel equalization for underwater communications

Gomes, João; Silva, A.; Jesus, S. M.

http://hdl.handle.net/10400.1/5229

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Authors

Gomes, João

Silva, A.

Jesus, S. M.

Abstract(s)

Time reversal has aroused considerable interest in communications applications as a means of partially compensating for the intersymbol interference introduced by the channel. This paper presents experimental results for a passive time reversal experiment conducted off the west coast of Portugal during the MREA’2004 mission. A single acoustic projector generated a 2/4-PSK stream at 200 and 400 baud, modulated around a carrier frequency of 3600 Hz. The signals were received at a range of about 2 Km from the source on a sparse vertical array with 8 hydrophones. We examine several strategies for demodulating the data, including equalization, time-reversal, and combinations of both techniques. This work emphasizes the use of low-complexity multichannel combining algorithms for tracking channel variations prior to generating a passively focused signal.

Keywords

Acoustic arrays Adaptive equalizers Intersymbol interference

URI

http://hdl.handle.net/10400.1/5229

Citation

J.P. GOMES, A. SILVA and S. JESUS, ``Joint Passive Time Reversal and Multichannel Equalization for Underwater Communications'' in Proc. OCEANS'06, pp. 1-6.