Title :
Multi-user detection in DS-CDMA systems: a conjugate-gradient implementation
Author :
Al Housseini, A. ; Chonavel, Th ; Saoudi, S. ; Ammar, M.
Author_Institution :
Dept. of Signal & Commun., Ecole Nat. Superieure des Telecommun. de Bretagne, Brest, France
Abstract :
This paper deals with direct-sequence code division multiple access (DS-CDMA) transmissions over mobile radio channels. An iterative conjugate gradient (CG) implementation of the decorrelator detector is studied in the case of asynchronous transmissions over multipath channels. This implementation is based on a sliding window technique. Simulation results are presented for flat fading Rayleigh multipath channels, showing that the proposed detector is resistant to the near-far effect and that low performance loss is obtained, compared to the single-user bound.
Keywords :
Rayleigh channels; code division multiple access; conjugate gradient methods; interference suppression; mobile radio; multipath channels; multiuser detection; radio receivers; spread spectrum communication; DS-CDMA systems; RAKE receiver; asynchronous transmissions; conjugate-gradient implementation; decorrelator detector; direct-sequence code division multiple access transmissions; fading Rayleigh multipath channels; mobile radio channels; multipath channels; multiuser detection; successive interference cancellation; Character generation; Decorrelation; Detectors; Fading; Interference cancellation; Jacobian matrices; Multiaccess communication; Multipath channels; Multiuser detection; Rayleigh channels;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
Print_ISBN :
0-7803-7757-5
DOI :
10.1109/VETECS.2003.1207207
