Adaptive filtering based DS/SS code acquisition in frequency selective and flat Rayleigh fading channels

Author

El-Tarhuni, Mohamed G. ; Sheikh, Asrar U.

Author_Institution

Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada

Volume

3

fYear

1997

fDate

4-7 May 1997

Firstpage

1624

Abstract

The mean acquisition time performance for a code acquisition scheme utilizing an FIR adaptive filter is investigated. Both frequency selective and frequency nonselective Rayleigh fading channels are considered. It is shown that fading causes a performance degradation of less than 3 dB for both the coherent and noncoherent cases when the carrier phase is varying slowly, and less than 5 dB for the noncoherent case with fast phase variations. This degradation is significantly smaller than that suffered by other systems based on using matched filters (about 10-15 dB degradation)

Keywords

FIR filters; Rayleigh channels; adaptive filters; adaptive signal processing; diversity reception; fading; filtering theory; multipath channels; pseudonoise codes; spread spectrum communication; synchronisation; time-varying channels; DS/SS code acquisition; FIR adaptive filter; adaptive filtering; coherent case; fast phase variations; flat Rayleigh fading channels; frequency nonselective Rayleigh fading channels; frequency selective fading channels; matched filters; mean acquisition time performance; multipath diversity; noncoherent case; performance degradation; slow carrier phase variation; time varying channels; Adaptive filters; Degradation; Delay effects; Fading; Finite impulse response filter; Frequency; Matched filters; Rayleigh channels; Signal generators; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1997, IEEE 47th

Conference_Location

Phoenix, AZ

ISSN

1090-3038

Print_ISBN

0-7803-3659-3

Type

conf

DOI

10.1109/VETEC.1997.605833

Filename

605833