Communications terminal and operating method

Details Communications terminal and operating method Communications terminal and operating method

2005-05-24

2005-05-24

Qureshi, Afsar (Department: 2667)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S342000, C375S150000

Reexamination Certificate

active

06898176

ABSTRACT:
A non-coherent technique employs a zero padded FFT for the fast acquisition of direct sequence spread spectrum signals in the presence of large Doppler shifts. The application of a FFT to code acquisition results in decreased acquisition time, and can improve the probability of detection. A set of partial correlators (1) and a zero padded FFT (2) are used to reduce the search region for code acquisition while maintaining good frequency resolution for Doppler offset. This approach will prove most pertinent in future reconfigurable terminals.

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R.A. Stirling-Gallacher, A.P. Hulbert, G.J.R. Povey, “A Fast Acquisition Technique for a Direct Sequence Spread Spectrum Signal in the Presence of a Large Doppler Shift”, XP-002102996, p. 156-160, 0-7803-3567-8/96, IEEE.
P.M. Grant et al. “Doppler estimation for fast acquisition in spread spectrum communication systems”, XP-002102967, p. 106-110, 0-7803-4281-X/97, IEEE.

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