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Non-linear interference cancellation for wireless transceivers

  • US 9,787,459 B2
  • Filed: 03/31/2014
  • Issued: 10/10/2017
  • Est. Priority Date: 04/17/2013
  • Status: Active Grant
First Claim
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1. A method for non-linear reduction of interference of a transmit signal and a received signal in a transceiver device, comprising:

  • applying said transmit signal to a first non-linear system wherein the first non-linear system comprises a non-linear filter operating on the transmit signal and wherein the first non-linear system is configured to model a non-linearity of a transmit (TX) chain of the transceiver device using a first memory model;

    applying said received signal to a second non-linear system wherein the second non-linear system comprises a non-linear post distortion filter operating on the received signal and the second non-linear system is configured to model an inverse of a non-linearity in a receive (RX) chain using a second memory model;

    adapting first parameters of the first non-linear system using tap adaptation circuitry;

    adapting second parameters of the second non-linear system using the tap adaptation circuitry; and

    subtracting an output of said first non-linear system from an output of said second nonlinear system to produce an interference mitigated received signal;

    wherein the first parameters and the second parameters are adapted to provide a least squares algorithm generated value for the interference mitigated received signal, and wherein the second parameters comprise an arbitrary linear gain value to prevent the interference mitigated received signal from going to zero.

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