Title :
Perturbation methods for canceling interference in CDMA systems
Author_Institution :
Comput. & Commun. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan
Abstract :
Formulas for multi-user detection (MUD) in CDMA systems are derived from perturbation theory. Higher order perturbation reduces more extensive (larger than 3 symbols) interference. The same formulas with a little change cancel the white interference distributed equally among all codes, and improve performance substantially. The results of simulation in multi-path channel show that there exists an optimum floor for the white interference and the methods outperform RAKE receivers.
Keywords :
code division multiple access; error statistics; fading channels; interference suppression; multipath channels; multiuser detection; perturbation techniques; radiofrequency interference; spread spectrum communication; BER; CDMA systems; codes; higher order perturbation; interference suppression; multipath channel; multipath fading environments; perturbation methods; perturbation theory; simulation results; white interference; Bit error rate; Delay effects; Detectors; Fading; Interference cancellation; Maximum likelihood detection; Multiaccess communication; Multiple access interference; Multiuser detection; Perturbation methods;
Conference_Titel :
Mobile and Wireless Communications Network, 2002. 4th International Workshop on
Print_ISBN :
0-7803-7605-6
DOI :
10.1109/MWCN.2002.1045836
