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Transmit leakage cancellation in a wide bandwidth distributed antenna system

  • US 9,042,838 B2
  • Filed: 08/22/2011
  • Issued: 05/26/2015
  • Est. Priority Date: 08/25/2010
  • Status: Active Grant
First Claim
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1. A method for transmission leakage cancellation in a wireless remote unit in a distributed antenna system (“

  • DAS”

    ), the remote unit having a first signal path coupled to a transmission antenna and a second signal path coupled to a receiving antenna, comprising;

    generating a pilot signal;

    introducing the pilot signal in the first signal path;

    generating a cancellation signal;

    receiving a received signal having a transmission leakage signal at the receiving antenna;

    providing the received signal to the second signal path; and

    ,cancelling the transmission leakage signal by adding the cancellation signal with the received signal over a bandwidth that is narrower than the bandwidth of the DAS,wherein an input to the cancellation signal is generated by adding the pilot signal and an output of a variable voltage attenuator.

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