DATA TRANSMISSION SYSTEM FOR TRANSMITTING DATA VIA RELAY HAVING MULTIPLE ANTENNAS

• US 20100136903A1
• Filed: 04/16/2009
• Published: 06/03/2010
• Est. Priority Date: 11/28/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Namyoon, KIM, Young-Doo, KIM, Eung Sun
• Granted Patent: US 8,204,434 B2
• Time in Patent Office: Days
• US Class Current: 455/17
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0242 using matrix methods
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end

Abstract

Disclosed is a data transmission system that transmits data using a relay. During a first time slot, a base station may transmit base station data to the relay, and a mobile station may transmit mobile station data to the relay. During a second time slot, the relay may transmit the mobile station data to the base station, and transmit the base station data to the mobile station.

Claims

1. A relay comprising:

a channel estimation unit to generate a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with the relay;

a receiving unit to generate a receiving vector including mobile station data received from the mobile station and base station data received from a base station, the base station data being precoded in the base station based on the first and second radio channel state matrixes;

a relay data generation unit to generate relay data including the mobile station data and the base station data based on the receiving vector and the second radio channel state matrix; and

a transmission unit to transmit the relay data to the base station and the mobile station.

2. The relay of claim 1, wherein the transmission unit transmits, to the base station, information about the first radio channel state matrix and the second radio channel state matrix.

3. The relay of claim 1, wherein the relay data generation unit multiplies an inverse matrix of the second radio channel state matrix by the receiving vector to obtain a product, and further multiplies an inverse matrix of a Hermitian matrix of the second radio channel state matrix by the obtained product to generate the relay data.

4. The relay of claim 1, wherein the precoded base station data being data generated by the base station by multiplying the second radio channel state matrix by the base station data to obtain a product, and further multiplying an inverse matrix of the first radio channel state matrix by the obtained product to precode the base station data.

5. The relay of claim 1, wherein the channel estimation unit receives a base station pilot signal from the base station and generates the first radio channel state matrix using the received base station pilot signal, and receives a mobile station pilot signal from the mobile station and generates the second radio channel state matrix.

6. Abase station comprising:

a preceding unit to precode base station data based on a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;

a transmission unit to transmit the precoded base station data to the relay using the plurality of base station antennas;

a receiving unit to receive, from the relay, relay data including mobile station data transmitted from the mobile station connected with the relay, and including the base station data; and

a data extraction unit to remove the base station data from the relay data to extract the mobile station data.

7. The base station of claim 6, further comprising:

an interference elimination unit to eliminate interference between the relay data transmitted from each of the plurality of relay antennas based on the first radio channel state matrix and the second radio channel state matrix,

wherein the data extraction unit eliminates the base station data from the relay data from which the interference is eliminated.

8. The base station of claim 6, wherein the receiving unit receives, from the relay, information about the first radio channel state matrix or information about the second radio channel state matrix.

9. The base station of claim 6, wherein the preceding unit multiplies the second radio channel state matrix by the base station data to obtain a product, and further multiplies an inverse matrix of the first radio channel state matrix by the obtained product to precode the base station data.

10. A method of forwarding data, the method comprising:

generating a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;

generating a receiving vector including mobile station data received from the mobile station and base station data received from a base station, the base station data being precoded in the base station based on the first and second radio channel state matrixes;

generating relay data including the mobile station data and the base station data based on the receiving vector and the second radio channel state matrix; and

transmitting the relay data to the base station and the mobile station.

11. The method of claim 10, wherein the generating of the relay data comprises multiplying an inverse matrix of the second radio channel state matrix by the receiving vector to obtain a product, and further multiplying an inverse matrix of a Hermitian matrix of the second radio channel state matrix by the obtained product to generate the relay data.

12. The method of claim 10, wherein the precoded base station data being data generated by the base station by multiplying the second radio channel state matrix by the base station data to obtain a product, and further multiplying an inverse matrix of the first radio channel state matrix by the obtained product to precode the base station data.

13. A method of receiving mobile station data, the method comprising:

preceding base station data based on a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;

transmitting the precoded base station data to the relay using the plurality of base station antennas;

receiving, from the relay, relay data including mobile station data transmitted from the mobile station connected with the relay and the base station data; and

extracting the base station data from the relay data to extract the mobile station data.

14. The method of claim 13, further comprising:

eliminating interference between the relay data transmitted from each of the plurality of relay antennas based on the first radio channel state matrix and the second radio channel state matrix,

wherein the extracting eliminates the base station data from the relay data from which the interference is eliminated.

15. The method of claim 13, wherein the preceding of the base station data comprises multiplying the second radio channel state matrix by the base station data to obtain a product, and further multiplying an inverse matrix of the first radio channel state matrix by the obtained product to precode the base station data.

16. A computer-readable storage medium storing a program to perform a method of forwarding data, comprising instructions to cause a computer to:

generate a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;

generate a receiving vector including mobile station data received from the mobile station and base station data received from a base station, the base station data being precoded in the base station based on the first and second radio channel state matrixes;

generate relay data including the mobile station data and the base station data based on the receiving vector and the second radio channel state matrix; and

transmit the relay data to the base station and the mobile station.

17. A mobile station receiving base station data from a base station having a plurality of base station antennas via a relay having a plurality of relay antennas, the mobile station comprising:

a transmission unit to transmit mobile station data to the relay;

a receiving unit to receive, from the relay, relay data including the mobile station data and the base station data transmitted from the base station; and

a data extraction unit to eliminate the mobile station data from the relay data to extract the base station data,

wherein the base station data is data precoded by the base station based on a first radio channel state matrix for a radio channel from the plurality of base station antennas to the plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to the mobile station.

18. The mobile station of claim 17, wherein the base station data is data precoded by multiplying the second radio channel state matrix by the base station data to obtain a product, and further multiplying an inverse matrix of the first radio channel state matrix by the obtained product.