Title :
Direct sequence spread spectrum based modem for under water acoustic communication and channel measurements
Author :
Sozer, E.M. ; Proakis, J.G. ; Stojanovic, M. ; Rice, J.A. ; Benson, A. ; Hatch, M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
Abstract :
An underwater acoustic communication system based on direct-sequence spread-spectrum signaling is presented. The method is intended for use in multiple-access underwater communication networks. In this paper, the transmitter and receiver designs are proposed, discussed, and demonstrated using real data. At the receiver, a RAKE filter is employed. The same signaling scheme is also used to obtain an adaptive estimate of the time-varying channel coefficients. The channel estimator performance is demonstrated using simulations and experimental data
Keywords :
acoustic receivers; adaptive estimation; code division multiple access; modems; pseudonoise codes; spread spectrum communication; telecommunication signalling; time-varying channels; transmitters; underwater acoustic communication; RAKE filter; adaptive estimate; channel estimator performance; channel measurements; direct sequence spread spectrum based modem; multiple-access underwater communication networks; receiver; signaling; time-varying channel coefficients; transmitter; under water acoustic communication; Acoustic propagation; Bandwidth; Frequency; Modems; RAKE receivers; Radio transmitters; Spread spectrum communication; Time division multiple access; Underwater acoustics; Underwater communication;
Conference_Titel :
OCEANS '99 MTS/IEEE. Riding the Crest into the 21st Century
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5628-4
DOI :
10.1109/OCEANS.1999.799743
