DIFFERENTIAL CODING AND INVERSE DISCRETE FOURIER TRANSFORM HYBRID CIRCUIT

摘要

PROBLEM TO BE SOLVED: To transmit signals in parallel among a differential coding circuit, a waveform conversion circuit and an inverse discrete Fourier transform circuit. SOLUTION: This hybrid circuit 1000 has a serial parallel converter 110, a parallel type signal conversion circuit 200, an inverse discrete Fourier transform circuit (IDFT) 300 and parallel serial converters 301, 302. Since the hybrid circuit 1000 conducts processing with parallel signals from an output of a differential code, signal conversion and inverse discrete Fourier transform, a time delay attended with serial parallel conversion is not caused. The hybrid circuit 1000 is especially useful for a modulator adopting the DQPSK-OFDM system.