Patent ID: 7724840
Filing Date: 2010-05-25
Classification: H03F,H04L

Abstract:
1. A radio-frequency (RF) transmitter with predistortion, said RF transmitter comprising: an adaptive equalizer configured to predistort a baseline communication signal into a predistorted communication signal and to adjust tap coefficients of said adaptive equalizer, said tap coefficients defining how to predistort said baseline communication signal; a power amplifier located downstream of said adaptive equalizer and configured to generate an RF communication signal which carries a residually distorted communication signal and intermodulation products thereof; a feedback signal generator configured to generate a feedback signal in response to said RF communication signal, said feedback signal being characterized by said residually distorted communication signal in combination with one or more of said intermodulation products; and an intermodulation-product canceller adapted to generate an intermodulation-neutralized-feedback signal from said feedback signal, said intermodulation-neutralized-feedback signal being supplied to said adaptive equalizer so that said tap coefficients adapt in response to said intermodulation-neutralized-feedback signal.