Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2005-05-17
2005-05-17
Ramakrishnaiah, Melur (Department: 2643)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S323000, C455S517000
Reexamination Certificate
active
06895231
ABSTRACT:
A method and apparatus provided for adjusting reference frequency iteratively in a receiver. Received data is correlated with a locally stored synchronization code and the peak correlation value is detected. In a first run-through this will be stored in a local peak correlation store. The frequency is then adjusted by a predetermined step and the process performed again, with the peak correlation value detected being compared with the peak in the local store. If the new peak is larger then that frequency step is saved and a further frequency step applied. If the new correlation peak is smaller than the previously stored peak then the frequency step applied to derive that new peak is removed and a smaller frequency step applied. This process continues for a succession of decreasing frequency steps until all the stored frequency steps have been used up, at which point the local oscillator frequency is adjusted and the receiver continues with the cell search process.
REFERENCES:
patent: 5276706 (1994-01-01), Critchlow
patent: WO 9966649 (1999-12-01), None
NEC Corporation
Ramakrishnaiah Melur
Scully Scott Murphy & Presser
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