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Analog distributed antenna systems (DASS) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (RF) communications signals

  • US 10,135,533 B2
  • Filed: 05/02/2017
  • Issued: 11/20/2018
  • Est. Priority Date: 11/13/2014
  • Status: Active Grant
First Claim
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1. A method for distributing analog radio frequency (RF) communications signals and digital communications signals in an analog distributed antenna system (DAS), comprising:

  • distributing downlink analog RF communications signals and downlink digital communications signals in the analog DAS, comprising;

    receiving at least one first downlink analog RF communications signal from at least one analog RF signal source;

    receiving at least one downlink digital communications signal from at least one digital signal source;

    converting the at least one downlink digital communications signal to at least one second downlink analog RF communications signal;

    modulating the at least one first downlink analog RF communications signal and the at least one second downlink analog RF communications signal to generate at least one combined downlink analog RF communications signal; and

    distributing the at least one combined downlink analog RF communications signal to at least one remote unit among a plurality of remote units in the analog DAS over a downlink communications medium; and

    distributing uplink analog RF communications signals and uplink digital communications signals in the analog DAS, comprising;

    receiving at least one combined uplink analog RF communications signal from the at least one remote unit among the plurality of remote units in the analog DAS over an uplink communications medium;

    demodulating the at least one combined uplink analog RF communications signal to generate at least one first uplink analog RF communications signal and at least one second uplink analog RF communications signal;

    providing the at least one first uplink analog RF communications signal to the at least one analog RF signal source;

    converting the at least one second uplink analog RF communications signal to at least one uplink digital communications signal; and

    providing the at least one uplink digital communications signal to the at least one digital signal source,wherein converting the at least one downlink digital communications signal to the at least one second downlink analog RF communications signal further comprises;

    receiving formatted downlink data packets from the at least one downlink digital communications signal;

    de-capsulating the formatted downlink data packets into consecutive downlink digital words;

    modulating the consecutive downlink digital words to generate at least one downlink digital intermediate frequency (IF) signal;

    converting the at least one downlink digital IF signal to at least one downlink analog IF signal;

    attenuating unwanted products and harmonics in the at least one downlink analog IF signal;

    modulating the at least one downlink analog IF signal to generate the at least one second downlink analog RF communications signal;

    attenuating unwanted products and harmonics in the at least one second downlink analog RF communications signal; and

    adjusting the at least one second downlink analog RF communications signal to a first predetermined power level.

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