| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a receiver side to easily obtain an accurate synchronizing signal, in an OFDM signal transmitting/receiving system. <P>SOLUTION: A transmitter side of the system has an IFFT circuit for generating a multilevel QAM signal, a guard interval setting circuit, and a clock signal generating circuit for driving both circuits. In the transmitter side, a pilot signal having a high frequency in which phases are to be set at predetermined values over a plurality of symbol sections is generated by the IFFT circuit, the pilot signal is set so as to have a wavelength multiplied by an integral number in the guard interval, to have half-wavelength multiplied by an odd number, to exist as signals in a real number section, or exist as a signal having a single frequency multiplied by four, and the pilot signal is continuously sent out over the plurality of symbol sections. A receiver side generates an accurate clock signal for driving the system on the basis of the pilot signal. <P>COPYRIGHT: (C)2004,JPO |
