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Systems and methods for self-interference canceller tuning

  • US 9,832,003 B2
  • Filed: 05/30/2017
  • Issued: 11/28/2017
  • Est. Priority Date: 08/09/2013
  • Status: Active Grant
First Claim
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1. A system for self-interference canceller tuning comprising:

  • a transmit coupler, communicatively coupled to an analog transmit signal of a wireless communication system, that samples the analog transmit signal to create a sampled analog transmit signal;

    an analog self-interference canceller that transforms the sampled analog transmit signal to an analog self-interference cancellation signal according to a set of tuning parameters, the set of tuning parameters comprising complex weights for a set of taps of the analog self-interference canceller;

    wherein each tap of the set of taps is associated with a filter;

    a tuning circuit that generates a tuning calibration profile based on both component calibration data and system calibration data of the analog self-interference canceller, calculates the set of tuning parameters in response to detection of a tuning trigger, and applies the set of tuning parameters to the analog self-interference canceller based on the tuning calibration profile;

    wherein the tuning trigger is detected in response to either time since last tune exceeding a time threshold or temperature change over a time interval exceeding a temperature change threshold;

    wherein applying the set of tuning parameters comprises setting attenuator values for each tap of the set of taps; and

    a receive coupler, communicatively coupled to an analog receive signal of the wireless communication system, that combines the analog self-interference cancellation signal with the analog receive signal to reduce self-interference in the analog receive signal.

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