Adaptive lattice filters for CDMA overlay

Author

Wang, Jiangzhou ; Prahatheesan, Vicknarajah

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong

Volume

48

Issue

5

fYear

2000

fDate

5/1/2000 12:00:00 AM

Firstpage

820

Lastpage

828

Abstract

This paper presents the behavior of reflection coefficients of a stochastic gradient lattice (SGL) filter applied to a code division multiple-access overlay system. Analytic expressions for coefficients for a two-stage filter are derived in a Rayleigh fading channel with the presence of narrow-band interference and additive white Gaussian noise. It is shown that the coefficients of the lattice filter exhibit separate tracking and convergent properties, and that compared to an LMS filter, the lattice filter provides fast rate of convergence, while having good capability of narrow-hand interference suppression

Keywords

AWGN; Rayleigh channels; adaptive filters; adaptive signal processing; cellular radio; code division multiple access; interference suppression; lattice filters; least mean squares methods; radiofrequency interference; stochastic processes; tracking filters; CDMA overlay; DS-CDMA; LMS filter; Rayleigh fading channel; adaptive lattice filters; additive white Gaussian noise; cellular mobile communications; code division multiple-access; convergence rate; convergent property; narrow-band interference; narrow-hand interference suppression; reflection coefficients; stochastic gradient lattice filter; tracking property; two-stage filter coefficients; Acoustic reflection; Adaptive filters; Additive white noise; Fading; Interference; Lattices; Multiaccess communication; Narrowband; Stochastic resonance; Stochastic systems;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.843195

Filename

843195