Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-08-07
2007-08-07
Phu, Phuong (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
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.
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Dickstein , Shapiro, LLP.
NEC Corporation
Phu Phuong
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