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Systems for multi-peak-filter-based analog self-interference cancellation

  • US 9,712,313 B2
  • Filed: 11/03/2015
  • Issued: 07/18/2017
  • Est. Priority Date: 11/03/2014
  • Status: Active Grant
First Claim
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1. A system for multi-peak filter-based analog self-interference cancellation comprising:

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

    an analog self-interference canceller, comprising a first signal divider, first and second filters, first, second, and third scalers, and a first signal combiner, wherein the first signal divider splits the analog transmit signal into first, second, and third signal paths;

    wherein the first filter filters the first signal path and the first scaler scales the first signal path to create a first analog self-interference signal component;

    wherein the second filter filters the second signal path and the second scaler scales the second signal path to create a second analog self-interference signal component;

    wherein the third signal path is unfiltered and the third scaler scales the third signal path to create a third analog self-interference signal component;

    wherein the first filter has a single peak centered at a first frequency;

    wherein the second filter has exactly two peaks centered at a second frequency and a third frequency respectively;

    wherein the first frequency is twice the second frequency;

    wherein the third frequency is three times the second frequency;

    wherein the first signal combiner combines the first, second, and third analog self-interference signal components to form a first analog self-interference cancellation signal;

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

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