Patent ID: 7515582
Filing Date: 2009-04-07
Classification: H04L

Abstract:
1. An apparatus for synchronization of an orthogonal frequency division multiplexing (OFDM) system, comprising: a delay conjugate multiplication module, performing a time delay on an input signal at a receiving end of said system to generate a delayed signal, extracting a conjugate value of said delayed signal, and multiplying said conjugate value with said input signal to obtain a delay conjugate multiplication signal; a phase computation module, performing a phase computation of said delay conjugate multiplication signal to obtain a differential phase absolute value signal; a delay moving sum module, processing said differential phase absolute value signal for a delay moving sum computation crossing at least two symbols to obtain a delay moving sum signal; and a minimum value detector, for finding a transition location of phase difference of said delay moving sum signal for synchronization of symbols of said OFDM system; wherein said delay moving sum module generates a cross-symbol delay sum signal, performs a first delay moving sum operation on said cross-symbol delay sum signal with a time delay of a guard interval, and then performs a second delay moving sum operation with a time delay of a sampling interval to generate said delay moving sum signal.