Title :
Analysis of the application of trellis coding to spread spectrum multiple access systems
Author :
Boudreau, G.D. ; Falconer, D.D. ; Mahmoud, S.A.
Author_Institution :
Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada
Abstract :
The authors investigate the performance of trellis coding when it is applied to a spread-spectrum multiple-access system. A system model is proposed that makes it possible to apply both trellis coding and a pseudonoise (PN) spreading sequence to the data symbols to be transmitted. Two- and four-state, rate-1/2 and -2/3 trellis codes are considered in conjunction with 4-PSK and 8-PSK signal constellations. Gold sequences of length 255 and 511 are used for purposes of PN spreading, in which the sequence spans one data symbol. Performance in an additive white Gaussian noise (AWGN) channel is investigated, with five or ten users transmitting simultaneously. Degradation due to the interuser interference from the spreading sequences is calculated using the method of moments.<>
Keywords :
encoding; multi-access systems; spread spectrum communication; 4-PSK; 8-PSK; Gold sequences; additive white Gaussian noise; data symbols; interuser interference; pseudonoise; spread spectrum multiple access systems; spreading; trellis coding; AWGN; Additive white noise; Constellation diagram; Convolutional codes; Degradation; Gold; Interference; Moment methods; Quadrature phase shift keying; Spread spectrum communication;
Conference_Titel :
Military Communications Conference, 1988. MILCOM 88, Conference record. 21st Century Military Communications - What's Possible? 1988 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/MILCOM.1988.13478
