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Offsetting unwanted downlink interference signals in an uplink path in a distributed antenna system (DAS)

  • US 10,292,114 B2
  • Filed: 10/26/2017
  • Issued: 05/14/2019
  • Est. Priority Date: 02/19/2015
  • Status: Active Grant
First Claim
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1. An interference signal offset circuit comprising:

  • at least one offset signal generation circuit configured to;

    receive a downlink signal in a downlink path, the downlink signal comprising at least one unwanted downlink interference signal; and

    generate at least one uplink interference offset signal based on the received at least one unwanted downlink interference signal;

    a signal summing circuit configured to;

    receive an uplink signal in an uplink path, the uplink signal comprising a wanted uplink signal and the at least one unwanted downlink interference signal leaked from the downlink path to the uplink path;

    receive the at least one uplink interference offset signal;

    generate an output uplink signal based on the received uplink signal; and

    combine the received at least one uplink interference offset signal with the received uplink signal to offset the at least one unwanted downlink interference signal from the output uplink signal; and

    a control circuit configured to;

    measure a power level of the at least one unwanted downlink interference signal;

    receive the output uplink signal from the signal summing circuit; and

    configure the at least one offset signal generation circuit to generate the at least one uplink interference offset signal based on the measured power level of the at least one unwanted downlink interference signal to offset the at least one unwanted downlink interference signal.

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