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Code division multiple access base transceiver station with active antennas

  • US 6,609,013 B1
  • Filed: 03/03/2000
  • Issued: 08/19/2003
  • Est. Priority Date: 03/12/1999
  • Status: Expired due to Term
First Claim
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1. A base transceiver station with active antennas in a DMA mobile communication system, comprising:

  • a transceiver installed indoors for up-converting a CDMA-modulated signal to be transmitted to a service subscriber and down-converting a signal received from the subscriber into an intermediate frequency signal;

    a divider installed indoors for dividing a forward channel signal from said transceiver into a plurality of sector-unit forward channel signals;

    a coupler for coupling a plurality of sector-unit reverse channel signals and transferring the resultant signal to said transceiver;

    antenna interface means installed indoors for appending a DC voltage to each of said sector-unit forward channel signals from said divider, transferring the resultant sector-unit forward channel signals to a Butler matrix, receiving said sector-unit reverse channel signals from said Butler matrix and transferring them to said coupler;

    said Butler matrix being installed outdoors for making said sector-unit forward channel signals from said antenna interface means out of phase from one another to produce beam forming signals, converting a reverse channel signal into said sector-unit reverse channel signals and transferring them to said antenna interface means; and

    active radio frequency means installed outdoors for radiating each of said beam forming signals from said Butler matrix at a predetermined beam width and predetermined orientation angle over the air, receiving said reverse channel signal from said subscriber, amplifying it and transferring the resultant signal to said Butler matrix.

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