Patent ID: 8270510
Filing Date: 2012-09-18
Classification: H04L

Abstract:
1. An apparatus for time synchronization of a received signal in an orthogonal frequency division multiplexing (OFDM) system, comprising: a shift register that sets one of a plurality of oversampled signals acquired by oversampling the received signal using a predetermined master clock as an on-time signal, shifts each of the remaining oversampled signals by a predetermined time on the basis of the on-time signal, and outputs the shifted signals and the on-time signal; a plurality of correlators that calculate a correlation value by correlating a corresponding signal among the shifted signals and the on-time signal with a previously known signal; a maximum value detector that detects a maximum energy value among the correlation values calculated by the plurality of correlators; and a comparator that detects a start point of a frame from the received signal by comparing a predetermined threshold value with the maximum energy value.