| 摘要 |
<p>A downlink line signal transmitted during a guard interval determined by using a delay profile made accurately with an uplink line COMA signal is received by an MS, the preamble portion of the downlink line signal is Fourier-transformed, and demodulated. The transmission parameters (guard interval, subcarrier frequency interval, number of subcarriers) contained in the preamble portion are extracted and outputted to a Fourier transform block (303). The data portion is Fourier-transformed according to the extracted transmission parameters by the Fourier transform block (303). The Fourier-transformed signal is demodulated by a demodulating block (304) and outputted as reception data. Thus, the delay profile used for determining the guard interval can be accurately made. Therefore the transmission quality is ensured, and the frequency use efficiency is improved. <IMAGE></p> |
