Perturbation methods for canceling interference in CDMA systems

Author

Lu, Chun Chian

Author_Institution

Comput. & Commun. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan

fYear

2002

fDate

2002

Firstpage

602

Lastpage

605

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Mobile and Wireless Communications Network, 2002. 4th International Workshop on

Print_ISBN

0-7803-7605-6

Type

conf

DOI

10.1109/MWCN.2002.1045836

Filename

1045836