Distributed smart antenna system

• US 20020193147A1
• Filed: 08/23/2002
• Published: 12/19/2002
• Est. Priority Date: 02/24/2000
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Li, Feng, Li, Jun, Li, Shihe
• Granted Patent: US 7,031,755 B2
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/246 specially adapted for base stations

Abstract

A distributed smart antenna system including an antenna array having N antenna elements, N radio frequency tranceivers, and feeder cables connecting both. N antenna elements and N radio frequency transceivers are grouped according to cell coverage range and traffic volume. Antenna element groups are then distributed at different places of coverage within the range of the same wireless communication system base station, including different buildings or different floors of same building; however, the same baseband digital signal processor is used. Each antenna element group can have one to M antenna elements. The system enables improved cell coverage, increased system capacity, and decreased system cost.

Claims

1. A distributed smart antenna system, comprising:

a plurality of antenna elements;

a plurality of radio frequency transceivers corresponding to the plurality of antenna elements, in one to one ratio, wherein the plurality of radio frequency transceivers connect with a baseband digital signal processor in a wireless communication system base station through a data bus; and

a plurality of feeder cables connecting each of said plurality of radio frequency transceivers to a respective one of said plurality of antenna elements,

wherein the plurality of antenna elements and the plurality of radio frequency transceivers are correspondingly grouped into a plurality of antenna element groups and corresponding multiple radio frequency transceiver groups, wherein each of said plurality of antenna element groups are distributed at different places in the coverage range of the wireless communication system base station, wherein each antenna element group connects with corresponding radio frequency transceiver group, and wherein each radio frequency transceiver group connects with the baseband digital signal processor through the data bus.

2. The system according to claim 1, wherein the grouping of the plurality of antenna element groups and corresponding multiple radio frequency transceiver groups is based on a cell range coverage of the wireless communication system base station and at least one of a traffic volume of the coverage cell range and a coverage floor number of the wireless communication system base station in combinations with a traffic volume of the coverage floor.

3. The system according to claim 1, wherein each antenna element group has 1 to M antenna elements connected correspondingly with 1 to M radio frequency transceivers of corresponding radio frequency transceiver group, and wherein the selection of the number of M antenna elements is based at least in part on the number of mobile subscribers and the propagation environment.

4. The system according to claim 3, wherein the 1 to M antenna elements of one antenna element group and the 1 to M corresponding radio frequency transceivers are distributed at same location.

5. The system according to claim 3, wherein the 1 to M antenna elements of one antenna element group are distributed at same place, and wherein radio frequency transceivers of corresponding and non-corresponding radio frequency transceiver groups are distributed in concentration at a location.

6. The system according to claim 1, wherein the different places comprise different buildings in cells covered by the wireless communication system base station or different floors in a building covered by the wireless communication system base station.

7. The system according to claim 6, wherein for the different floors in a building, antenna element groups are distributed such that each floor is allocated with an antenna element group or sets of two floors are allocated with an antenna element group, and each antenna element group applies same frequency, time slot and code channel.

8. The system according to claim 6, wherein for the different floors in a building, antenna element groups are distributed such that each floor is allocated with an antenna element group, and each antenna element group applies same frequency, time slot and code channel, but different interference codes and training sequences.

9. A distributed smart antenna system, comprising:

a plurality of antenna element groups;

a plurality of radio frequency transceiver groups in communication with the plurality of antenna element groups; and

a baseband digital signal processor,

wherein each antenna element group comprises 1 to M antenna elements and each radio frequency transceiver group comprises 1 to M radio frequency transceivers;

wherein the 1 to M antenna elements of one antenna element group connect correspondingly with 1 to M radio frequency transceivers of one radio frequency transceiver group to form a plurality of groups, wherein antenna elements of different groups are distributed on different buildings within the coverage range of a wireless communication system base station, wherein antenna elements of different groups apply same frequency, time slot and code channel, and wherein radio frequency transceivers of different groups connect with the baseband digital signal processor through a data bus.

10. The system according to claim 9, wherein 1 to M radio frequency transceivers and corresponding 1 to M antenna elements of one group are set in the same or different buildings.

11. A distributed smart antenna system, comprising:

a plurality of antenna element groups;

a plurality of radio frequency transceiver groups, each radio frequency transceiver group corresponding to an antenna element group in one to one ratio; and

a baseband digital signal processor;

wherein each antenna element group comprises 1 to M antenna elements and each radio frequency transceiver group comprises 1 to M radio frequency transceivers, wherein the 1 to M antenna elements of one antenna element group connect correspondingly with 1 to M radio frequency transceivers of one radio frequency transceiver group to form a plurality of groups, wherein the antenna elements of different groups are distributed on different floors of a building within the coverage range of a wireless communication system base station, wherein antenna elements of different floors apply, in interleaving, the same frequency, time slot and code channel, or same frequency, time slot and code channel, but different interference codes and training sequences, and wherein radio frequency transceivers of different groups connect with the baseband digital signal processor through a data bus.

12. The system according to claim 11, wherein the 1 to M radio frequency transceivers and corresponding 1 to M antenna elements of one group are set on the same floor or different floors of the building.