Method for frequency offset estimation in a direct sequence...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

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Details

C375S148000, C375S150000, C375S326000, C375S344000

Reexamination Certificate

active

10204217

ABSTRACT:
A method of estimating the difference in frequency between base station transmissions received over a radio channel and a locally generated carrier frequency in a mobile receiver. The differential phase shifts imparted to different parts of a received synchronization code because of a frequency offset of the local reference oscillator are detected in the receiver. A series of partial correlations of the received synchronization code over a single transmission slot allows detection of the differential phase shifts. Signal to noise ratios may be improved by means of a series of overlapping partial correlations. The period over which the correlations are performed is much less than the coherence time of the radio channel.

REFERENCES:
patent: 6005889 (1999-12-01), Chung et al.
patent: 6266361 (2001-07-01), Huang et al.
patent: 6-77932 (1994-03-01), None
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patent: 2001-102960 (2001-04-01), None
patent: 2001-102961 (2001-04-01), None
patent: 2001-177436 (2001-06-01), None
patent: WO-99/12273 (1999-03-01), None
patent: WO-99/31816 (1999-06-01), None
patent: WO 99/66649 (1999-12-01), None

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