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Systems for integrated self-interference cancellation

  • US 10,243,598 B2
  • Filed: 03/16/2017
  • Issued: 03/26/2019
  • Est. Priority Date: 10/13/2015
  • Status: Active Grant
First Claim
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1. A system for integrated self-interference cancellation, comprising:

  • a transmit coupler, communicatively coupled to a transmit signal of a full-duplex wireless transceiver, that samples the transmit signal to create a sampled transmit signal;

    an analog self-interference canceller, coupled to the transmit coupler, the analog self-interference canceller comprising;

    a controller;

    a signal divider, that splits the sampled transmit signal into a set of signal components, the set of signal components transmitted by way of a set of transmit paths;

    a set of phase shifters, coupled to the set of transmit paths, wherein a phase shifter of the set of phase shifters shifts a signal component of the set of signal components by a total phase shift value;

    wherein the phase shifter comprises a set of phase shift stages, each stage having a stage phase shift value, the set connected to the phase shifter by a set of switches;

    wherein the total phase shift value is set by a state configuration of the set of switches and the stage phase shift values of the set of phase shift stages;

    a set of scalers, coupled to the set of transmit paths, wherein a scaler of the set of scalers scales the signal component by a total scale factor;

    a signal combiner, coupled to the set of transmit paths, that combines the set of signal components into a self-interference cancellation signal; and

    a receive coupler, communicatively coupled to a receive signal of the full duplex wireless transceiver, that combines the self-interference cancellation signal with the receive signal to remove at least a first portion of self-interference present in the receive signal.

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