Optimization of partial parallel interference cancellation (PPIC) factor in CDMA systems

Author

Fawzy, A.N. ; Fayez, A.W. ; Riad, Mona M.

Author_Institution

Egyptian Armed Forces, Egypt

Volume

4

fYear

2000

fDate

2000

Firstpage

2375

Abstract

The paper introduces an optimized formula for the partial parallel interference cancellation (PPIC) factor in CDMA systems. This factor is introduced to decrease the biasing term, which appears in the brute force cancellation scheme, in which the cancellation is done totally. This operation degrades the system performance since the amplitude estimate in the early stages is not reliable, so in turn, the multiple access interference (MAI) estimate isn´t reliable either, and the performance is degraded. We obtain a formula for PPIC bit error rate (BER) as a function of the PPIC factor F_k, and derive a formula for an optimum F_k that minimizes BER. We introduce plots of BER to show the enhancement in BER when we use the optimum F _k at different system parameters

Keywords

code division multiple access; interference (signal); interference suppression; optimisation; CDMA systems; amplitude estimate; biasing term; bit error rate; brute force cancellation scheme; multiple access interference estimate; partial parallel interference cancellation factor; AWGN; Amplitude estimation; Bit error rate; Decorrelation; Delay; Interference cancellation; Maximum likelihood detection; Multiaccess communication; Multiple access interference; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Systems, Man, and Cybernetics, 2000 IEEE International Conference on

Conference_Location

Nashville, TN

ISSN

1062-922X

Print_ISBN

0-7803-6583-6

Type

conf

DOI

10.1109/ICSMC.2000.884346

Filename

884346