A new fuzzy logic application to variable step size LMS algorithm for adaptive antennas in CDMA systems

Author

Van Su, Pbam ; Tuan, Le Minh ; Kim, Jewoo ; Yoon, Giwan

Author_Institution

Inf. & Commun. Univ., Taejon, South Korea

fYear

2002

fDate

17-19 Aug. 2002

Firstpage

685

Lastpage

688

Abstract

This paper proposes a new application of fuzzy logic to variable step size least mean square (VS-LMS) adaptive beamforming algorithm in CDMA systems. The proposed algorithm adjusts the step size of the least mean square (LMS) by using the application of fuzzy logic in which the increase or decrease of step size depends on the fuzzy inference results of the mean square error (MSE). Computer simulation results show that the proposed algorithm has a better capacity of tracking compared with the conventional LMS algorithms and other variable step size LMS algorithms.

Keywords

adaptive antenna arrays; array signal processing; code division multiple access; fuzzy logic; least mean squares methods; CDMA systems; adaptive antennas; adaptive beamforming algorithm; fuzzy inference; fuzzy logic application; tracking; variable step size LMS algorithm; variable step size least mean square; Adaptive arrays; Computer simulation; Convergence; Fuzzy logic; Inference algorithms; Least squares approximation; Mathematical model; Microwave antennas; Millimeter wave technology; Multiaccess communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on

Print_ISBN

0-7803-7486-X

Type

conf

DOI

10.1109/ICMMT.2002.1187793

Filename

1187793