| 摘要 |
PROBLEM TO BE SOLVED: To improve the performance of reference carrier reproduction especially in a demodulator and AGC characteristics by providing a quadrature modulator 5, an intermediate frequency generator (center carrier generator) 6, an adder 21A and a level adjuster 21B in the case of performing transmission by an OFDM(orthogonal frequency division multiplex) modulation system. SOLUTION: For data signals including sub-carrier signals for synchronization, this device generates modulation signals by the OFDM modulation system. The modulation level of the sub-carrier signals for the synchronization is made higher than the maximum modulation level of sub-carriers for other data and the modulation signals are generated. |
