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

• Current Assignee: Yamazaki Holdings LLC (Intellectual Ventures LLC)
• Original Assignee: SK Hynix Inc.
• Inventors: Oh, Chi Wook, Park, Hong Jun
• Primary Examiner(s): Chin, Vivian
• Assistant Examiner(s): Nguyen, Tu X
• Application Number:
  US09/518,494
• Time in Patent Office: 1,264 Days
• Field of Search: 455/562, 455/522, 455/561, 455/550, 455/88
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0491 using two or more sectors, i.e. sector diversity
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A base transceiver station with active antennas in a CDMA 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 the 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 the transceiver, an antenna interface unit installed indoors for appending a DC voltage to each of the sector-unit forward channel signals from the divider, transferring the resultant sector-unit forward channel signals to a Butler matrix, receiving the sector-unit reverse channel signals from the Butler matrix and transferring them to the coupler, and an active radio frequency module installed outdoors for radiating each beam forming signal from the Butler matrix at a predetermined beam width and predetermined orientation angle over the air, receiving the reverse channel signal from the subscriber, amplifying it and transferring the resultant signal to the Butler matrix.

Claims

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.

2. The base transceiver station as set forth in claim 1, wherein said antenna interface means includes:

a power supply for converting an external commercial AC input voltage into a DC voltage to satisfy input conditions of said active radio frequency means; and

first to third power/signal couplers for coupling said sector-unit forward channel signals from said divider with said DC voltage from said power supply, respectively.

3. The base transceiver station as set forth in claim 1, wherein said antenna interface means includes:

a power supply for converting an external commercial AC input voltage into a DC voltage desired by said active radio frequency means;

a power control signal generator for communicating with indoor equipment to receive transmission/reception power control values therefrom and generating transmission/reception power control signals respectively according to the received power control values;

transmission power control means for amplifying said sector-unit forward channel signals from said divider in response to said transmission power control signal from said power control signal generator, coupling each of the amplified sector-unit forward channel signals with said DC voltage from said power supply and transferring the resultant forward channel signals to said Butler matrix; and

reception power control means for amplifying said sector-unit reverse channel signals from said Butler matrix in response to the reception power control signal from said power control signal generator and transferring the resultant reverse channel signals to said coupler.

4. The base transceiver station as set forth in claim 3, wherein said transmission power control means includes first to third transmission power controllers, each of said transmission power controllers amplifying a corresponding one of said sector-unit forward channel signals from said divider in response to said transmission power control signal from said power control signal generator, coupling the amplified forward channel signal with said DC voltage from said power supply and transferring the resultant forward channel signal to said Butler matrix.

5. The base transceiver station as set forth in claim 4, wherein each of said first to third transmission power controllers includes:

an amplifier for amplifying the corresponding sector-unit forward channel signal from said divider by a fixed gain;

an attenuator for attenuating the amplified forward channel signal from said amplifier in response to said transmission power control signal from said power control signal generator; and

a power/signal coupler for coupling the attenuated forward channel signal from said attenuator with said DC voltage from said power supply and transferring the resultant forward channel signal to said Butler matrix.

6. The base transceiver station as set forth in claim 3, wherein said reception power control means includes first to third reception power controllers, each of said reception power controllers amplifying a corresponding one of said sector-unit reverse channel signals from said Butler matrix in response to said reception power control signal from said power control signal generator and transferring the amplified sector-unit reverse channel signal to said coupler.

7. The base transceiver station as set forth in claim 6, wherein each of said first to third reception power controllers includes:

an amplifier for amplifying the corresponding sector-unit reverse channel signal from said Butler matrix by a fixed gain; and

an attenuator for attenuating the amplified reverse channel signal from said amplifier in response to said reception power control signal from said power control signal generator and transferring the attenuated reverse channel signal to said coupler.

8. The base transceiver station as set forth in claim 1, wherein said active radio frequency means includes first to fourth antenna arrays horizontally arranged to form a beam radiation pattern.

9. A base transceiver station with active antennas in a CDMA 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, said active radio frequency means including first to fourth antenna arrays horizontally arranged to form a beam radiation pattern, each of said first to fourth antenna arrays including;

a transmission amplifier for amplifying said beam forming signals from said Butler matrix to a predetermined power level;

a transmission band pass filter for filtering the amplified beam forming signals from said transmission amplifier at a predetermined band;

a transmission antenna for radiating each of the filtered beam forming signals from said transmission band pass filter over the air at a predetermined beam width and predetermined orientation angle;

a reception antenna for receiving said sector-unit reverse channel signals from the subscriber;

a reception band pass filter for filtering the received reverse channel signals from said reception antenna at a predetermined band; and

a reception amplifier for amplifying the filtered reverse channel signals from said reception band pass filter to a predetermined power level and transferring the amplified.

10. The base transceiver station as set forth in claim 9, wherein said predetermined beam width is 30°

in every sector and said transmission antenna has a propagation area of 90°

corresponding to three sectors.

11. The base transceiver station as set forth in claim 9, wherein said antenna interface means includes:

a power supply for converting an external commercial AC input voltage into a DC voltage to satisfy input conditions of said active radio frequency means; and

first to third power/signal couplers for coupling said sector-unit forward channel., signals from said divider with said DC voltage from said power supply, respectively.

12. The base transceiver station as set forth in claim 9, wherein said antenna interface means includes:

a power supply for converting an external commercial AC input voltage into a DC voltage desired by said active radio frequency means;

a power control signal generator for communicating with indoor equipment to receive transmission/reception power control values therefrom and generating transmission/reception power control signals respectively according to the received power control values;

transmission power control means for amplifying said sector-unit forward channel signals from said divider in response to said transmission power control signal from said power control signal generator, coupling each of the amplified sector-unit forward channel signals with said DC voltage from said power supply and transferring the resultant forward channel signals to said Butler matrix; and

reception power control means for amplifying said sector-unit reverse channel signals from said Butler matrix in response to the reception power control signal from said power control signal generator and transferring the resultant reverse channel signals to said coupler.

13. The base transceiver station as set forth in claim 12, wherein said transmission power control means includes first to third transmission power controllers, each of said transmission power controllers amplifying a corresponding one of said sector-unit forward channel signals from said divider in response to said transmission power control signal from said power control signal generator, coupling the amplified forward channel signal with said DC voltage from said power supply and transferring the resultant forward channel signal to said Butler matrix.

14. The base transceiver station as set forth in claim 13, wherein each of said first to third transmission power controllers includes:

an amplifier for amplifying the corresponding sector-unit forward channel signal from said divider by a fixed gain;

an attenuator for attenuating the amplified forward channel signal from said amplifier in response to said transmission power control signal from said power control signal generator; and

a power/signal coupler for coupling the attenuated forward channel signal from said attenuator with said DC voltage from said power supply and transferring the resultant forward channel signal to said Butler matrix.

15. The base transceiver station as set forth in claim 12, wherein said reception power control means includes first to third reception power controllers, each of said reception power controllers amplifying a corresponding one of said sector-unit reverse channel signals from said Butler matrix in response to said reception power control signal from said power control signal generator and transferring the amplified sector-unit reverse channel signal to said coupler.

16. The base transceiver station as set forth in claim 15, wherein each of said first to third reception power controllers includes:

an amplifier for amplifying the corresponding sector-unit reverse channel signal from said Butler matrix by a fixed gain; and

an attenuator for attenuating the amplified reverse channel signal from said amplifier in response to said reception power control signal from said power control signal generator and transferring the attenuated reverse channel signal to said coupler.