Method and apparatus for acquiring slot timing and frequency...

Details Method and apparatus for acquiring slot timing and frequency... Method and apparatus for acquiring slot timing and frequency...

2005-09-27

2005-09-27

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S140000, C375S147000, C375S149000

Reexamination Certificate

active

06950458

ABSTRACT:
A method and apparatus for acquiring slot timing and frequency offset correction of a local oscillator, provided for use in a direct sequence spread spectrum receiver. The received signals in such a system comprise a plurality of sequential slots of data. Some of these comprise synchronization data. At least two different correlations are performed at a receiver between the received data and a locally stored synchronization code. These are compared to determine which give the strongest correlation peak and the timing of this peak is then stored. The offset to be applied to a local oscillator in the receiver is then estimated from this time and subsequently applied to the local oscillator.

REFERENCES:
patent: 5276706 (1994-01-01), Critchlow
patent: 6728326 (2004-04-01), Fulghum
patent: 2 309 315 (1997-07-01), None
European Search Report dated Dec. 11, 2002.

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