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RF module for wireless unit configured for self-interference cancellation

  • US 9,698,861 B2
  • Filed: 04/28/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 08/25/2010
  • Status: Active Grant
First Claim
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1. A radio-frequency (RF) module for use in a wireless communication device configured for interference cancellation, the RF module comprising:

  • a transmit signal path to be coupled to a transmit antenna for full-duplex communications, the transmit signal path comprising a variable voltage attenuator provided in the transmit signal path prior to a power amplifier;

    a receive signal path to be coupled to a receive antenna for full-duplex communications, the receive signal path comprising a variable voltage attenuator provided in the receive signal path after a low-noise amplifier; and

    cancellation circuitry coupled to the receive and transmit signal paths,wherein the cancellation circuitry is configured to;

    generate a pilot signal for self-interference estimation, receive a transmuted signal and generate a cancellation signal for the receive signal path to cancel self-interference based at least on receipt of the pilot signal,inject the pilot signal into the transmit signal path for transmission by the transmit antenna for self-interference estimation and generation of the cancellation signal, andgenerate an estimate of self-interference for interference between the transmit antenna and the receive antenna based on receipt of the pilot signal by the receive antenna, the estimate based on a presence of the pilot signal in the receive signal path.

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