Title :
Decision-directed passive phase conjugation: equalisation performance in shallow water
Author :
Flynn, J.A. ; Ritcey, J.A. ; Fox, W. L J ; Jackson, D.R. ; Rouseff, D.
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
fDate :
12/6/2001 12:00:00 AM
Abstract :
A decision-directed extension to passive phase conjugation array demodulation is described. Initialisation by a training preamble is followed by block least-squares channel estimation via conjugate gradient and memoryless decisions, which are used by estimation in the next block. Excellent shallow-water performance is shown at ranges up to 46 km under windy conditions and shipping noise. The algorithm demonstrates low error rate and robust channel tracking
Keywords :
demodulation; digital communication; equalisers; error statistics; estimation theory; least squares approximations; underwater acoustic telemetry; 46 km; BER; bit error rate; block least-squares channel estimation; conjugate gradient decisions; decision-directed passive phase conjugation; equalisation performance; initialisation; low error rate; memoryless decisions; passive phase conjugation array demodulation; robust channel tracking; shallow-water performance; shipping noise; training preamble; underwater acoustic communication; underwater telemetry; windy conditions;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20011030
