SENDING DEVICE WITH DIGITAL PREDISTORTION, AND ITS CONTROL METHOD OF PREDISTORTION

摘要

PROBLEM TO BE SOLVED: To provide a sending device equipped with a digital predistortion unit.

SOLUTION: This digital predistortion unit has a control input portion. A control signal (CONT1) is impressed in this control input portion. This control signal is outputted from a power control unit 12. This power control unit evaluates the power control signal (LS). A pre-distortion unit 2 distorts a baseband signal which transmits in a case where it becomes impossible to maintain the linearity of a power amplifier 8 in an electric power required for the time being if the predistortion is not carried out. To this case, the baseband signal is multiplied to a predistortion factor determined with a level of the baseband signal.

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