Patent ID: 6366574
Filing Date: 2002-04-02
Classification: H04L

Abstract:
Method for recovering synchronization on a signal transmitted to a mobile-telephone receiver, comprising the steps of:detecting a synchronization packet contained in the transmitted signal; acquiring a clock phase in a coarse acquisition mode, during which the synchronization is acquired to within one quarter of the duration of a symbol, refining an estimate in a fine acquisition mode, which is a first-order phase-locked loop operation ensuring rapid synchronization acquisition with small final fluctuation, wherein the fine estimation step is firstly carried out on a first group of symbols, during which a noise estimate is also made with a view to detecting false signals, then on another group of symbols, during which the nose estimate is also made in order to determine whether the synchronization acquisition is late and takes place outside the synchronization field, in which case the estimation step is stopped, and finally on the remaining number of symbols in order to improve the precision of the fine estimate.