Convergence analysis of adaptive distributed decorrelators for DS-CDMA systems

Author

Liu, Yuan ; Qin, Zheng

Author_Institution

coll. of Electron. Sci. & Inf., Xi´´an Jiaotong Univ., China

Volume

2

fYear

2004

fDate

31 May-2 June 2004

Firstpage

381

Abstract

Convergence analysis for adaptive distributed decorrelators in both additive white Gaussian noise and fading channels is presented. The adaptive distributed decorrelators combines spatial diversity and decorrelators. The performance of decorrelators do not depend on the other users´ energies and the other users´ fading characteristics. The blind adaptive diversity combining scheme based on stochastic gradient techniques is formulated using optimal likelihood ratio testing criterion, and its convergence is analyzed theoretically and is demonstrated by numerical example. The proposed method is suitable for real-time implementation and can provide a significant receiver performance and system capacity gain.

Keywords

AWGN; code division multiple access; convergence; correlation theory; decorrelation; diversity reception; fading channels; gradient methods; radio receivers; spread spectrum communication; DS-CDMA system; adaptive distributed decorrelator; additive white Gaussian noise; blind adaptive diversity combining scheme; convergence analysis; fading channel; fading characteristic; optimal likelihood ratio testing criterion; real-time implementation; receiver performance; spatial diversity combining; stochastic gradient technique; system capacity gain; user energy; Additive white noise; Convergence of numerical methods; Decorrelation; Diversity reception; Fading; Multiaccess communication; Performance gain; Real time systems; Stochastic resonance; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Emerging Technologies: Frontiers of Mobile and Wireless Communication, 2004. Proceedings of the IEEE 6th Circuits and Systems Symposium on

Print_ISBN

0-7803-7938-1

Type

conf

DOI

10.1109/CASSET.2004.1321901

Filename

1321901