Demodulation timing generation circuit and demodulation apparatus

Abstract

A demodulation timing generation circuit capable of generating correctly and with high precision a timing for demodulating a reception signal even under various kinds of reception conditions and a demodulation apparatus using the same, wherein AGC control and frequency offset correction are performed by the burst detectorand the amplification gain controllerusing a synchronization training signal (burst signal) added to the head of the reception signal (packet), a detection window period is provided for cross-correlation detection to detect the peak of the cross-correlation in the detection window DW by the timing controller, and in the end (rear edge) of the window, data corresponding to the peak position is loaded in the counterfor counting the OFDM symbol interval. Due to this, it is possible to set an optimal FFT timing irrespective of the condition of a channel.