Patent ID: 7742537
Filing Date: 2010-06-22
Classification: H04L

Abstract:
1. A time domain symbol timing synchronization circuit in a receiver of a communication system, for getting symbol boundary of received communication symbols having phase reference sequences performing like pseudo-noise sequences, the time domain symbol timing synchronization circuit comprising: an autocorrelation function calculator, for calculating cyclic prefix autocorrelation functions; and an offset time estimator, coupled to the autocorrelation function calculator, for searching positions at peaks of the cyclic prefix autocorrelation functions to indicate symbol boundary of received communication symbols, wherein the offset time estimator compares a position at a peak of a current cyclic prefix autocorrelation function of received communication symbols and a position at a peak of a previous cyclic prefix autocorrelation function of received communication symbols; if a difference of the positions is larger than a threshold and the peak of the current cyclic prefix autocorrelation function is smaller than a reference average peak, the peak of the current cyclic prefix autocorrelation function is determined as false; the offset time estimator weeds out and replaces the position at the peak of the current cyclic prefix autocorrelation function by the position at the peak of the previous cyclic prefix autocorrelation function; and the current peak is not introduced in calculation of the reference average peak.