| 摘要 |
PURPOSE: To cancel the deviation of frequencies and phases between a carrier wave and a local oscillation frequency signal. CONSTITUTION: The FDM system transmitter is provided with a modulation circuit 45 for calculating a pair of arbitrary products of a modulating signal expressed by the complex number of vectors, and the carrier wave is modulated and transmitted by the products. At the receiver, outputs from local oscillators L0 to LN are mixed with the modulated carrier wave, filtered by low-pass filters R0 to Rn and sampled and a demodulating signal is extracted. The ratio of the demodulating signal of the carrier wave and the demodulating signal of a carrier wave equipped with the adjacent frequency is calculated by a demodulation circuit 57 and the original modulated signal is provided. |
