| 摘要 |
PURPOSE: To compensate a valid transmitter signal depending on the transfer function of a coupled filter by filtering a transmitter signal, and constituting a whole transfer function of the inverted value of a transfer function converted into the base band of the coupled filter. CONSTITUTION: Distortion due to a coupled filter COMB is compensated by filtering a transmitter signal before the transmitter signal is transmitted to the coupled filter. In one filter, within a frequency range almost occupied by the transmitter signal, the transfer function is constituted of the inverted value of the transfer function of the coupled filter within the same frequency range. The transfer function of the coupled filter is converted into the base band of a valid signal, and made similar to the transfer function of a low-pass filter, and when the inverted value of this transfer function is calculated, the transfer function of a high-pass filter can be obtained. Therefore, a non-modulated signal is supplied through a filter in which the distortion of the coupled filter COMB should be compensated. |
