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Frequency dependent I/Q impairment compensation

  • US 9,130,626 B2
  • Filed: 03/26/2014
  • Issued: 09/08/2015
  • Est. Priority Date: 04/10/2013
  • Status: Expired due to Fees
First Claim
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1. A method of compensating for I/Q impairments in a digital signal, comprising:

  • decomposing, at a wireless modem, the digital signal into a plurality of components;

    scaling, at the wireless modem, a frequency domain version of a first component from the plurality of components according to a frequency dependent I/Q impairment precompensation function to obtain a precompensated frequency domain version of the first component;

    combining, at the wireless modem, the precompensated frequency domain version of the first component with a frequency domain version of a second component from the plurality of components to produce a precompensated frequency domain version of the digital signal;

    transforming, at the wireless modem, the precompensated frequency domain version of the digital signal to a time domain to produce a precompensated time domain version of the digital signal; and

    transmitting, from the wireless modem, the precompensated time domain version of the digital signal over a wireless channel.

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