Patent ID: 6314083
Filing Date: 2001-11-06
Classification: H04L

Abstract:
A frequency control device for frequency synchronization with a multiplex signal produced by orthogonal frequency division multiplexing into a plurality of sub-carriers, comprising:quadrature detection means for performing quadrature detection on said multiplex signal to obtain a first detection axis signal and a second detection axis signal, which are quadrate to each other;discrete Fourier transform means for obtaining a plurality of metrics distributed in a frequency domain, by sampling respective time axis waveforms of said two detection axis signals at a predetermined sampling frequency, and by performing a discrete Fourier transform on thus-sampled data;operation control means for generating frequency change instructions in accordance with a difference between a distribution of the metrics obtained by said discrete Fourier transform means and a predetermined distribution of metrics; andfrequency changing means for changing a frequency of a signal inputted into said discrete Fourier transform means in accordance with said instructions generated by said operation control means.