Doppler compensation and code acquisition techniques for LEO satellite mobile radio communications

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Doppler compensation and code acquisition techniques for LEO satellite mobile radio communications

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Fifth International Conference on Satellite Systems for Mobile Communications and Navigation — Recommend this title to your library

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  • DOI:  10.1049/cp:19960398
  • ISBN: 0 85296 658 X
  • Location: London, UK
  • Conference date: 13-15 May 1996
  • Format: PDF
LEO satellite channels can experience extremely large Doppler shifts which makes the PN code acquisition of spread spectrum signals difficult. The use of an FFT technique to estimate the Doppler offset on a pilot carrier signal is shown to allow Doppler shift compensation to within 250 Hz. This eliminates the need to search the Doppler ambiguity during code acquisition and considerable improves the mean code acquisition time performance. We consider the performance of a code acquisition architecture developed for satellite spread spectrum receivers.

Inspec keywords: radio receivers; frequency estimation; fast Fourier transforms; spread spectrum communication; pseudonoise codes; telecommunication channels; mobile satellite communication; Doppler shift

Subjects: Codes; Satellite communication systems; Mobile radio systems; Other numerical methods

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