Patent ID: 6895231

Claim:
A method for adjusting reference frequency in a receiver wherein received signals include a plurality of sequential slots of data, at least one of which includes synchronization data, said method comprising the steps of: down-converting received signals using a first frequency derived from a local oscillator; performing a correlation of said down-converted signal with the locally stored synchronization code; detecting a peak correlation value from the result of said correlation; comparing said peak correlation value with the contents of a peak correlation value store; and adjusting said frequency applied to said down-converting in dependence on the results of said comparison, in said adjusting of the frequency, performing further correlations and frequency adjustments with short intervals so long as the previous frequency adjustment results in a larger peak correlation value than is stored in said peak correlation value store, in accordance with the result of the comparison, and removing the last made frequency adjustment if it resulted in a smaller peak correlation value than is stored in said peak correlation value store, in accordance with the result of the comparison.