Patent ID: 6563865
Filing Date: 2003-05-13
Classification: H04L

Abstract:
A modulator/demodulator for modulating and demodulating a signal, comprising:interleave process means for interleaving input transmission data and producing interleaved transmission data; selection means for selecting one of the interleaved transmission data and reception data; Fourier transform means including an input register for storing the transmission data or the reception data selected by the selection means, a Fourier-transform processing section for performing inverse-Fourier-transform processing and Fourier-transform processing on the transmission data and the reception data, respectively, that are fetched from the input register, and an output register for storing the transmission data and the reception data processed at said Fourier-transform processing section and read control means for reading the transmission data so that a beginning part and an end part of the transmission data are repeatedly read when said output register stores the inverse-Fourier-transformed transmission data and for reading the reception data so as to de-interleave the reception data when said output register stores the Fourier-transformed reception data.