Adaptive narrowband interference rejection in DS-CDMA systems: a scheme of parallel interference cancellers

Author

Hou, Wen-Sheng ; Chen, Li-Mei ; Chen, Bor-Sen

Author_Institution

Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

Volume

19

Issue

6

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

1103

Lastpage

1114

Abstract

In the presence of narrowband interference (NBI), the performance of the direct-sequence code-division multiple access communication system can be improved by using various interference cancellation schemes. In this paper, a scheme of parallel interference cancellers (PICs), which includes a set of NBI cancellation filters and a set of multiple access interference (MAI) cancellation filters, is developed to improve the signal-to-interference ratio (SIR) and handle the MAI effect. In order to avoid performance deterioration due to unreliable initial detection, a robust coefficient γ is introduced in our proposed design criterion. A recursive least-square algorithm is employed to update the tap coefficients of the PICs. In other words, no training or retraining period is needed in our proposed PICs. Finally, the SIR performance of the proposed detector is analyzed and compared to that of the conventional linear detector

Keywords

adaptive filters; adaptive signal detection; cellular radio; code division multiple access; filtering theory; interference suppression; least squares approximations; multiuser channels; radiofrequency interference; spread spectrum communication; DS-CDMA systems; NBI cancellation filters; SIR performance; adaptive detector; adaptive narrowband interference rejection; cellular telecommunications services; design criterion; direct-sequence code-division multiple access; indoor wireless networks; linear detector; mobile telephony; multiple access interference cancellation filters; parallel interference cancellers; personal communications; recursive least-square algorithm; robust coefficient; signal-to-interference ratio; tap coefficients updating; Direct-sequence code-division multiple access; Filters; Gamma ray detection; Gamma ray detectors; Interference cancellation; Multiaccess communication; Multiple access interference; Narrowband; Performance analysis; Robustness;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.926366

Filename

926366