Title :
Performance of DS/SSMA systems with MTCM codes
Author :
Jin, Ik Soo ; Choi, Song In ; Lee, Jin Ho ; Whang, Keum Chan
Author_Institution :
Mobile Telecommun. Div., Electron. & Telecommun. Res. Inst., Taejon, South Korea
Abstract :
We examine the use of multiple trellis coded modulation (MTCM) codes for a direct sequence spread spectrum multiple access (DS/SSMA) system for fading channels, and compare the results with Boudreau et al.´s (1990) system, in which the use of standard Ungerboeck type trellis codes in conjunction with a DS/SSMA system has been considered. A generalized transfer function method is used to evaluate upper bounds on bit error probability. Multiple access interference due to K asynchronous users transmitting simultaneously is computed using the method of moments. From the calculations and results, it is shown that DS/SSMA system with MTCM codes achieves better performance than the Boudreau et al.´s system
Keywords :
coding errors; error statistics; fading; method of moments; multi-access systems; pseudonoise codes; radiofrequency interference; spread spectrum communication; transfer functions; trellis coded modulation; trellis codes; DS/SSMA systems performance; MTCM codes; Ungerboeck type trellis codes; asynchronous users; bit error probability; direct sequence spread spectrum multiple access; fading channels; generalized transfer function method; method of moments; multiple access interference; multiple trellis coded modulation; upper bounds; Code standards; Convolutional codes; Error probability; Fading; Modulation coding; Moment methods; Multiple access interference; Spread spectrum communication; Transfer functions; Upper bound;
Conference_Titel :
Vehicular Technology Conference, 1997, IEEE 47th
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-3659-3
DOI :
10.1109/VETEC.1997.600523
