Diversity combining for long-range acoustic communication in deep water.
A recent experiment showed that coherent long-range acoustic communication is feasible in deep water over a ∼550 km range between a source towed slowly at ∼75 m depth and a horizontal line array towed at 3.5 knots at ∼200 m depth. This letter further demonstrates that diversity combining mitigates channel fading and increases the output signal-to-noise ratio. Using sparse channel-estimate-based equalization, three transmissions are combined successfully to decode a 40 Hz bandwidth (230-270 Hz) 8 phase-shift-keying communication signal, achieving an effective data rate of 17 bits/s at ∼550 km range.
Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238, USA. hcsong@mpl.ucsd.edu
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D000162:Acoustics / Q000295:instrumentation; D000465:Algorithms; D016014:Linear Models; D008962:Models, Theoretical; D009038:Motion; D009792:Oceans and Seas; D012767:Ships; D012815:Signal Processing, Computer-Assisted; D059629:Signal-To-Noise Ratio; D013016:Sound; D013997:Time Factors; D014867:Water
D014867:Water