SYSTEM AND METHOD FOR SPATIAL DIVISION MULTIPLE ACCESS USING WIRELESS REPEATER HAVING SINGLE TRANSMITTING/RECEIVING ANTENNA

• US 20100150034A1
• Filed: 12/10/2009
• Published: 06/17/2010
• Est. Priority Date: 12/11/2008
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: SONG, Young Seog, Kwon, Dong Seung
• Granted Patent: US 8,340,001 B2
• Time in Patent Office: Days
• US Class Current: 370/279
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

A system for spatial division multiple access using a wireless repeater having a single transmitting/receiving antenna, includes: a base station that selectively transmits a plurality of data stream signals to the wireless repeater within an area through a multi-transmitting antenna for downlink; and at least one wireless repeater that forms a wireless repeater group within the base station area and repeats the data stream signals selectively transmitted from the base station to terminals.

Claims

1. A system for spatial division multiple access, comprising:

a base station that selectively transmits a plurality of data stream signals through multiple transmitting antennas for downlink; and

at least one wireless repeater that have a transmitting antenna and a receiving antenna and forms a wireless repeater group within the base station area and repeats the data stream signals selectively transmitted from the base station to terminals.

2. The system for spatial division multiple access of claim 1, wherein

the base station includes:

a channel collection unit that collects downlink channels between each wireless repeater and the multiple transmitting antennas of the base station; and

a signal processor that performs the signal processing to selectively transmit each data stream corresponding to each wireless repeater, based on the downlink channels that are collected upon simultaneously transmitting the plurality of data streams.

3. The system for spatial division multiple access of claim 2, wherein

the channel collection unit

acquires the downlink channel values by being periodically fed back with the downlink channel values from the wireless repeater, or

acquires the downlink channel values by estimating uplink channels based on pilot signals received from the wireless repeater in the case of a time division duplex (TDD) system.

4. The system for spatial division multiple access of claim 2, wherein

the signal processor

obtains selection vectors for selecting one of the multiple antennas by performing a minimum mean square error (MMSE) method or a zero forcing (ZF) method on the downlink channel values.

5. The system for spatial division multiple access of claim 2, wherein

the signal processor

obtains the selection vectors for selecting one of the multiple antennas by performing a precoding method on the downlink channel values.

6. The system for spatial division multiple access of claim 4, wherein

the signal processor

sums vectors obtained by multiplying the selection vectors by the plurality of data stream signals, respectively, at the front ends of the multiple antennas, and transmits them.

7. The system for spatial division multiple access of claim 6, wherein

the signal processor

down-transmits identifier information corresponding to the repeating areas of each wireless repeater to the terminal and is fed back with the index information of the wireless repeaters selected from the terminal to determine the repeating areas (positions) of the terminals.

8. A method for performing spatial division multiple access by allowing a base station to use a wireless repeater having a single transmitting/receiving antenna, comprising:

collecting downlink channels from at least one wireless repeater within the area of the base station;

determining a repeating area included in terminals for the spatial division multiple access; and

selectively transmitting a plurality of data stream signals to the wireless repeater through a multi-transmitting antennal for downlink.

9. The method for spatial division multiple access of claim 8, wherein

the collecting downlink channels includes

storing the downlink channel values by being fed back therewith from the wireless repeater, or

acquiring the downlink channel values by estimating uplink channels based on pilot signals received from the wireless repeater in the case of a time division duplex (TDD) system.

10. The method for spatial division multiple access of claim 8, wherein:

the determining a repeating area includes;

defining the index information of the wireless repeaters;

transmitting the repeating area identifier information to each repeating area by performing the signal processing on the downlink channel values; and

determining the repeating areas of the terminals based on first index information fed back from the terminal, wherein the first index information is information that detects and selects the repeating area identifier information by the terminal.

11. The method for spatial division multiple access of claim 8, wherein

the selectively transmitting includes

obtaining selection vectors for selecting one of the multiple antennas, and

summing vectors obtained by multiplying the selected vectors by the generated stream signals at the front ends of the multiple antennas, respectively, and transmitting them.

12. The method for spatial division multiple access of claim 11, wherein

the obtaining of the selected vectors

performs at least one of a minimum mean square error (MMSE) method, a zero forcing (ZF) method, and a precoding method on the downlink channel values.