Patent ID: 6609013
Filing Date: 2003-08-19
Classification: H04B,H04W

Abstract:
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.