Feedforward predistortion linearizer

Details Feedforward predistortion linearizer Feedforward predistortion linearizer

H - Electricity

04

B

333/26

H04B 3/14 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2021617

A feedforward predistortion equalizer includes a first loop with a signal divider for dividing signals into first and second portions, and a distortion generator for distorting the second signal. The first loop is completed by a signal combiner which combines the undistorted first signal and the distorted second signal. The phase and amplitude of the signals in the loop are controlled so that the linear or carrier signal component is cancelled, leaving at the output of the first combiner only the distortion component of the distorted signal. A second loop includes phase and amplitude controls for combining the pure distortion and undistorted signals to produce the desired predistorted signals. In a particular embodiment, the phase and amplitude controls of the first loop are automatically adjusted for a null.

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