Method and apparatus for correcting frequency offset and...

Details Method and apparatus for correcting frequency offset and... Method and apparatus for correcting frequency offset and...

2006-02-28

2006-02-28

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S140000, C375S147000, C375S365000

Reexamination Certificate

active

07006558

ABSTRACT:
The present invention relates to a method and apparatus for correcting frequency offset of a local oscillator in a direct sequence spread spectrum receiver such as Universal Mobile Telecommunications System (UMTS). Received signals comprise a plurality of sequential slots of data. At least one of these includes synchronization data. A correlation is performed between this received data and a locally stored synchronization code. Subsequently, the received data is phase adjusted and a further correlation performed between the phase adjusted data and the locally stored synchronization code. The strongest correlation peak is then determined and a phase offset to be applied to the local oscillator is estimated from the phase adjustment required to produce the strongest peak. This is subsequently applied to the local oscillator.

REFERENCES:
patent: 5276706 (1994-01-01), Critchlow
patent: 2002/0061054 (2002-05-01), Boloorian
patent: WO 99/66649 (1999-12-01), None
Copy of European Search Report dated Dec. 6, 2002.

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