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SEPARATION OF COMMUNICATION SIGNAL SUB-BANDS IN DISTRIBUTED ANTENNA SYSTEMS (DASS) TO REDUCE INTERFERENCE

  • US 20150195055A1
  • Filed: 01/03/2014
  • Published: 07/09/2015
  • Est. Priority Date: 01/03/2014
  • Status: Active Grant
First Claim
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1. A sub-band separation circuit for providing band separation between sub-bands of downlink communications signals and uplink communications signals in a remote unit of a distributed antenna system (DAS), comprising:

  • a downlink splitter configured to;

    receive a downlink communications signal having a downlink bandwidth comprising a plurality of downlink communications sub-bands on a downlink splitter input; and

    split the received downlink communications signal into a plurality of split downlink communications signals on a plurality of splitter outputs;

    a plurality of sub-band isolation circuits, each sub-band isolation circuit comprising;

    a downlink isolation circuit configured to;

    receive a split downlink communications signal among the plurality of split downlink communications signals from a split output among the plurality of splitter outputs; and

    isolate at least one downlink communications sub-band among the plurality of downlink communications sub-bands in the split downlink communications signal to generate a communications sub-band signal; and

    a duplexer configured to;

    receive the communications sub-band signal on a downlink duplexer input;

    receive an uplink communications signal on an antenna interface coupled to an antenna; and

    pass the communications sub-band signal to the antenna interface.

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