Title :
Adaptive lattice filters for CDMA overlay
Author :
Wang, Jiangzhou ; Prahatheesan, Vicknarajah
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong
fDate :
5/1/2000 12:00:00 AM
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;
Journal_Title :
Communications, IEEE Transactions on
