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Reducing leaked downlink interference signals in a remote unit uplink path(s) in a distributed antenna system (DAS)

  • US 9,960,850 B2
  • Filed: 02/06/2017
  • Issued: 05/01/2018
  • Est. Priority Date: 07/31/2015
  • Status: Active Grant
First Claim
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1. A wireless communication system, comprising:

  • a plurality of remote units located on multiple floors of an infrastructure, each remote unit configured to receive optical communications signals and having at least one antenna;

    a head-end equipment (HEE) communicatively coupled to the plurality of remote units over at least one downlink optical communications medium and at least one uplink optical communications medium;

    wherein at least one remote unit among the plurality of remote units comprises a coupling device coupled to a downlink path configured to carry a downlink signal and an uplink path configured to carry an uplink signal, the coupling device configured to;

    receive the downlink signal from the downlink path and provide the downlink signal to an antenna, wherein the downlink signal comprises at least one downlink communications signal and at least one downlink interference signal; and

    provide the uplink signal to the uplink path, wherein the uplink signal comprises an uplink communications signal received from the antenna and the at least one downlink interference signal leaked from the downlink path to the uplink path; and

    an interference control system communicatively coupled to the at least one remote unit among the plurality of remote units, the interference control system configured to;

    provide the at least one downlink communications signal to the at least one remote unit over the at least one downlink optical communications medium;

    receive the uplink signal from the at least one remote unit over the at least one uplink optical communications medium;

    measure signal strength of the at least one downlink interference signal comprised in the uplink signal; and

    generate and provide an adjustment control signal to an adjustment circuit in the at least one remote unit to reduce the at least one downlink interference signal in the uplink signal.

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