| 摘要 |
PROBLEM TO BE SOLVED: To obtain a distortion compensating apparatus capable of preventing input signals exceeding a saturation points from being input to amplifiers. SOLUTION: A DPD processing section 2 includes an inverse model estimation section 22 for estimating an inverse model to a model indicating I/O characteristics of an HPA 6, based on an input signal to the HPA 6 and an output signal from the HPA 6, a distortion compensation section 26 for correcting the input signal based on the inverse model to compensate for distortion in the I/O characteristics, a saturation point determination section 21 for detecting a saturation point H of the operation of the HPA 6, based on the I/O characteristics, and a level adjustment section 25 for adjusting the level of the input signal so that the maximum value of the input signal does not exceed the saturation point H. COPYRIGHT: (C)2010,JPO&INPIT
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