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Systems and methods for non-linear digital self-interference cancellation

  • US 9,667,299 B2
  • Filed: 01/28/2015
  • Issued: 05/30/2017
  • Est. Priority Date: 08/09/2013
  • Status: Active Grant
First Claim
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1. A system for non-linear digital self-interference cancellation comprising:

  • a pre-processor communicatively coupled to a digital transmit signal of a communication system that generates a first pre-processed digital transmit signal from the digital transmit signal;

    a non-linear transformer, comprising a first transform path and a second transform path, that transforms the first pre-processed digital transmit signal into a non-linear self-interference signal according to a transform configuration;

    wherein the first transform path has a model component of an order specified by a first positive integer and the second transform path has a model component of an order specified by a second positive integer;

    wherein the first transform path includes an upsampler that upsamples the first pre-processed digital transmit signal by a factor of the first positive integer to create an upsampled signal, a model component that generates a first non-linear self-interference signal component of an order specified by the first positive integer from the upsampled signal, a low-pass filter that removes undesired high frequency components from the first non-linear self-interference signal component, and a downsampler that downsamples the first non-linear self-interference signal component by a factor of the first positive integer;

    a transform adaptor that sets the transform configuration of the non-linear transformer; and

    a post-processor that combines the non-linear self-interference signal with a digital receive signal of the communication system.

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