Doppler estimation for fast acquisition in spread spectrum communication systems

Author

Grant, P.M. ; Spangenberg, S.M. ; Scott, I. ; McLaughlin, S. ; Povey, G.J.R. ; Cruickshank, D.G.M.

Author_Institution

Dept. of Electron. & Electr. Eng., Edinburgh Univ., UK

Volume

1

fYear

1998

fDate

2-4 Sep 1998

Firstpage

106

Abstract

This paper describes a non-coherent technique which employs a fast Fourier transform (FFT) for the fast acquisition of direct sequence spread spectrum signals in the presence of large Doppler shifts. The application of an FFT to code acquisition results in decreased acquisition time and can improve the probability of detection. The technique discussed in this paper uses a set of partial correlators and a zero-padded FFT to reduce the search region for code acquisition whilst maintaining good frequency resolution for Doppler offset. This approach will prove most pertinent in future re-configurable terminals

Keywords

Doppler shift; correlators; fast Fourier transforms; probability; signal detection; signal resolution; spread spectrum communication; synchronisation; Doppler estimation; FFT; acquisition time; code Doppler offset; code acquisition; detection probability; direct sequence spread spectrum signals; fast Fourier transform; fast acquisition; frequency resolution; large Doppler shifts; noncoherent technique; partial correlators; re-configurable terminals; search region reduction; spread spectrum communication systems; zero-padded FFT; Correlators; Detectors; Doppler shift; Fast Fourier transforms; Frequency; Matched filters; Multiaccess communication; Spread spectrum communication; Tracking loops; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on

Conference_Location

Sun City

Print_ISBN

0-7803-4281-X

Type

conf

DOI

10.1109/ISSSTA.1998.726206

Filename

726206