| 摘要 |
PROBLEM TO BE SOLVED: To reduce the leakage electricity to an adjacent channel owing to widening of the band of a signal in the predistorter of an amplifier used for mobile communication. SOLUTION: In a predistorter, an input signal inputted to an amplifier is previously deformed by the inverse characteristic of a characteristic between input/output in the amplifier for reducing the leakage electricity to the adjacent channel in amplifier output. A correction coefficient 4 corresponding to the differentiation or integration of the input signal or to two values is decided. The input signal is deformed based on the correction coefficient 4 and a final predistortion signal can be obtained.
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