QUADRATURE FREQUENCY DIVISION MULTIPLEX TRANSMISSION SYSTEM, TRANSMISSION EQUIPMENT AND RECEPTION EQUIPMENT THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide demodulation with high quality and demodulation suitable for mobile reception. SOLUTION: A received OFDM signal is transformed from the time domain to the frequency domain by Fourier transformation 12, and a vector array for each carrier in the frequency domain is provided. Required dispersion and terminal pilot signals are extracted from the vector array 13, transmission line characteristics related to the dispersion/terminal pilot signals are estimated by dividing them with a modulated complex vector 15, and transmission line characteristics related to the information transmission carrier of a segment for synchronous detection are estimated by interpolating these transmission line characteristics 16. Meantime, the vector array provided by Fourier transformation is delayed by one symbol 17, an interpolated output is selected in the case of segment for synchronous detection, but a delayed output is selected in the case of segment for differential detection 18, the synchronous detection or differential detection is performed 19 by dividing the vector array by the selected output and additional information and digital information are provided 20 by demodulation 20.