Narrow-band interference rejection in DS CDMA communications using an adaptive IIR notch filter

Author

Mvuma, Aloys ; Nishimura, Shotaro ; Hinamoto, Takao

Author_Institution

Graduate Sch. of Eng., Hiroshima Univ., Japan

Volume

2

fYear

2002

fDate

4-7 Aug. 2002

Abstract

Suppression of narrow-band interference (NBI) in direct-sequence code-division multiple-access (DS CDMA) system using a lattice-based adaptive infinite impulse response (IIR) notch filter is studied. A simplified normalized coefficient update algorithm that requires no gradient signal generating filters is proposed. Convergence behaviour of the algorithm is shown not to vary much with the number of active users for a tone NBI model. Closed form expression for the SNR improvement at the pseudonoise (PN) correlator input is derived. Computer simulations are shown to verify the analyses and compare the performance of the proposed NBI suppression scheme with that of a linear prediction filter.

Keywords

IIR filters; adaptive filters; code division multiple access; interference suppression; lattice filters; notch filters; spread spectrum communication; DS-CDMA communication; SNR; computer simulation; convergence; lattice adaptive IIR notch filter; linear prediction filter; narrow-band interference suppression; normalized coefficient update algorithm; pseudonoise correlator; tone model; Adaptive filters; Computer simulation; Convergence; Correlators; IIR filters; Interference suppression; Multiaccess communication; Multiple access interference; Narrowband; Signal generators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on

Print_ISBN

0-7803-7523-8

Type

conf

DOI

10.1109/MWSCAS.2002.1186883

Filename

1186883