Title :
Perturbation methods for cancelling multi-user interference
Author_Institution :
Comput. & Commun. Res. Lab., ITRI, Hsinchu, Taiwan
Abstract :
Based on perturbation theory, formulas for multi-user detection in CDMA systems are derived. Starting from single user detection and applying iterative perturbations to correct for interference, we obtain better linear combination amplitudes for codes of the multi-user waveform and hence lower bit error rate (BER). The computation complexity is reduced to the minimum by calculating the interference in frames and sliding 3-symbol-window for all users
Keywords :
code division multiple access; codes; error statistics; interference suppression; multiuser channels; perturbation theory; radiofrequency interference; signal detection; spread spectrum communication; BER; CDMA systems; Walsh spreading codes; bit error rate; code division multiple access; computation complexity reduction; iterative perturbations; linear combination amplitudes; multi-user detection; multi-user interference cancellation; multi-user waveform; perturbation methods; perturbation theory; single user detection; sliding 3-symbol-window; Bit error rate; Communication systems; Delay effects; Detectors; Equations; Interference cancellation; Laboratories; Multiaccess communication; Multiuser detection; Perturbation methods;
Conference_Titel :
Computers and Communications, 2001. Proceedings. Sixth IEEE Symposium on
Conference_Location :
Hammamet
Print_ISBN :
0-7695-1177-5
DOI :
10.1109/ISCC.2001.935376
