Patent ID: 7539464

Claim:
A power series type predistorter for multi-frequency bands, comprising: a linear transmission path consisting of a delay element for delaying input signals; N distortion generating paths, N being an integer equal to or greater than 2; dividing means for dividing the input signals to said linear transmission path and said N distortion generating paths; N variable band signal extractors each inserted in corresponding one of said N distortion generating paths, for extracting signals in N different frequency bands from said input signals; N distortion generators each inserted in corresponding one of said N distortion generating paths, for generating distortion components of a predetermined odd order of said signals in said N frequency bands; combining means for combining an output from said linear transmission path and outputs from said N distortion generating paths and outputting a result of combining from the predistorter; and a frequency band controller for controlling frequency bands of said N variable band signal extractors.