Shallow-water acoustic communication with high bit rate BPSK signals
conference paper
BPSK signals have been defined for transmission through a shallow-water acoustic communication channel. The signals were accompanied by two displaced carriers to facilitate carrier recovery. To correct for the adverse effects of time spreading, a pseudo-random learning sequence was transmitted ahead of the communication signal. The signal processing consists of a shift to baseband guided by the displaced carriers, a least-squares equalizer tuned to the received learning signal, coherent addition of reconstructed baseband signals (corresponding to selected channels of the receiving hydrophone array), and bit restoration with a decision-directed equalizer. In this manner, bit rates up to 4 kbit/s are successfully dealt with in moving-point-to-fixed-point communication. The main risk appears to be the fading of a displaced carrier.
Topics
Acoustic signal processingCarrier communicationCommunication channels (information theory)EqualizersHydrophonesLeast squares approximationsPhase shift keyingUnderwater acousticsBinary phase shift keyingLeast square equalizerPseudo random learning sequenceShallow water acoustic communicationOceanography
TNO Identifier
235745
Publisher
IEEE
Source title
Oceans 2000 MTS/IEEE, 11-14 September 2000, Providence, RI, USA,
Place of publication
Piscataway, NJ, United States
Pages
1621-1624
Files
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