Title :
Low signal-to-noise-ratio underwater acoustic communications using direct-sequence spread-spectrum signals
Author :
Yang, T.C. ; Yang, Wen-Bin
Author_Institution :
Naval Res. Lab., Washington
Abstract :
Direct sequence spread spectrum (DSSS) uses a code sequence to spread the symbols at the transmitter and a de-spreader at the receiver to recover the transmitted symbols. The de-spreader via a correlator or a matched filter provides a processing gain (matched filter gain) which enhances the symbol energy over noise thus allowing communications at low input signal-to-noise ratio. This paper analyzes DSSS data collected during the TREX04 experiment and determine the bit error rate as a function of input SNR The data analyzed cover a total of 1160 packets with input SNR ranging from 23 dB to as low as -15 dB.
Keywords :
code division multiple access; error statistics; matched filters; packet radio networks; sonar signal processing; spread spectrum communication; underwater acoustic communication; DSSS; TREX04 experiment; bit error rate; code sequence; correlator; direct sequence spread spectrum signals; input SNR; matched filter gain; packet data transmission; processing gain; receiver despreader; transmitted symbol recovery; transmitter symbol spreading; underwater acoustic communication SNR; Bit error rate; Data analysis; Decision feedback equalizers; Fading; Matched filters; Sea measurements; Signal to noise ratio; Spread spectrum communication; Underwater acoustics; Underwater communication;
Conference_Titel :
OCEANS 2007 - Europe
Conference_Location :
Aberdeen
Print_ISBN :
978-1-4244-0635-7
Electronic_ISBN :
978-1-4244-0635-7
DOI :
10.1109/OCEANSE.2007.4302213
