Title :
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
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;
Conference_Titel :
Microwave and Millimeter Wave Technology, 2002. Proceedings. ICMMT 2002. 2002 3rd International Conference on
Print_ISBN :
0-7803-7486-X
DOI :
10.1109/ICMMT.2002.1187793
