DocumentCode :
2602158
Title :
Shallow-water acoustic communication with high bit rate BPSK signals
Author :
van Gijzen, M.B. ; van Walree, P.A.
Author_Institution :
TNO Phys. & Electron. Lab., The Hague, Netherlands
Volume :
3
fYear :
2000
fDate :
2000
Firstpage :
1621
Abstract :
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
Keywords :
equalisers; least squares approximations; mobile communication; phase shift keying; signal reconstruction; synchronisation; underwater acoustic communication; 4 kbit/s; bit rates; bit restoration; carrier recovery; coherent addition; decision-directed equalizer; displaced carrier; high bit rate BPSK signals; least-squares equalizer; moving-point-to-fixed-point communication; pseudo-random learning sequence; received learning signal; reconstructed baseband signals; shallow-water acoustic communication; signal processing; time spreading; Acoustic signal processing; Array signal processing; Baseband; Binary phase shift keying; Bit rate; Communication channels; Equalizers; Signal processing; Signal restoration; Sonar equipment;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
OCEANS 2000 MTS/IEEE Conference and Exhibition
Conference_Location :
Providence, RI
Print_ISBN :
0-7803-6551-8
Type :
conf
DOI :
10.1109/OCEANS.2000.882172
Filename :
882172
Link To Document :
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