TRANSMITTER USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEX MODULATION SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a transmitter employing an orthogonal frequency division multiple modulation system that can detect and correct a frequency offset with a small circuit scale even on the occurrence of the frequency offset in excess of a frequency interval of a carrier. SOLUTION: The transmitter is provided with a circuit that inserts a special symbol having a signal only with one carrier by each prescribed period. The receiver is provided with a small-scale circuit that uses a complex vector signal ZCW (n) of a plurality of carriers obtained by applying discrete Fourier transform to this special symbol part to detect a carrier frequency offset of a base band multiplex signal obtained by quasi-synchronized detection and that corrects the frequency offset.