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DISTORTION COMPENSATION IN A COMMUNICATION SYSTEM

  • US 20090116578A1
  • Filed: 11/07/2007
  • Published: 05/07/2009
  • Est. Priority Date: 11/07/2007
  • Status: Active Grant
First Claim
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1. A communication system comprising:

  • a modulator configured to mix a transmit-path signal based on a local oscillator (LO) signal;

    an amplifier configured to amplify the mixed transmit-path signal to generate an output signal for transmission;

    a demodulator configured to generate a receive-path signal based on the output signal and the LO signal;

    phase-shift control components configured to provide the output signal and the LO signal to the demodulator during a first time duration and to provide a phase-shifted version of one of the output signal and the LO signal to the demodulator during a second time duration, the demodulator being configured to generate a second receive-path signal based on the one of the phase-shifted output signal and the phase-shifted LO signal during the second time duration; and

    at least one predistortion circuit configured to adjust at least one of the transmit-path signal and the receive-path signal based on a difference in signal characteristics of the receive-path signal during the second time duration relative to the first time duration.

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