TWO-WAY RELAY APPARATUS AND METHOD THEREOF

• US 20140369255A1
• Filed: 06/13/2014
• Published: 12/18/2014
• Est. Priority Date: 06/13/2013
• Status: Active Grant

• Current Assignee: Korea University Research and Business Foundation (Korea University), Samsung Electronics Co. Ltd.
• Original Assignee: Korea University Research and Business Foundation (Korea University), Samsung Electronics Co. Ltd.
• Inventors: Lee, Inkyu, Song, Changick, Park, Haewook
• Granted Patent: US 9,660,714 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence

Abstract

One or more embodiments provide an apparatus and a method to estimate channel information even when channel information is not accurately known and design a relay filter based on the estimated information in a two-way relay system where a terminal having a single antenna and a relay exist. A relay apparatus of a two-way relay system includes a receiver, a controller, and a transmitter. The receiver receives a signal from at least one terminal. The controller estimates a channel between the terminals based on the received signal, and calculates a receiver matrix and a precoder. The transmitter transmits a signal precoded by the precoder.

Claims

1. A relay apparatus of a two-way relay system, the relay apparatus comprising:

a receiver configured to receive a signal from a plurality of terminals;

a controller configured to estimate a channel between the plurality of terminals, and calculate a receiver matrix and a precoder based on the received signal; and

a transmitter configured to transmit a signal precoded by the precoder.

2. The apparatus of claim 1, wherein the controller is configured to calculate the precoder based on a precoding matrix index (PMI) included in the received signal.

3. The apparatus of claim 2, wherein the PMI is calculated by the plurality of terminals and then included in a fed-back control signal.

4. The apparatus of claim 3, wherein the PMI is obtained when the plurality of terminals estimate a backward channel from the relay apparatus and calculate the PMI based on the estimated result.

5. The apparatus of claim 1, wherein the controller is configured to estimate a channel between the plurality of terminals based on a sounding reference signal included in the received signal.

6. The apparatus of claim 5, wherein the precoded signal is a signal from which the sounding reference signal is removed and into which a user-specific reference signal is inserted.

7. The apparatus of claim 1, wherein the controller is further configured to determine whether self interference cancellation is performable by the plurality of terminals.

8. The apparatus of claim 7, wherein the controller is configured to determine whether self-interference cancellation (SIC) is performable by the plurality of terminals based on an SIC indicator included in the received signal.

9. The apparatus of claim 8, when the SIC is performable by the plurality of terminals, the precoded signal is a signal into which a user-specific reference signal is inserted.

10. An operating method by a relay of a two-way relay system, the method comprising:

receiving a signal from a plurality of terminals;

estimating a channel between the plurality of terminals, and calculating a receiver matrix and a precoder based on the received signal; and

transmitting a signal precoded by the precoder.

11. The method of claim 10, wherein the precoder is calculated based on a precoding matrix index (PMI) included in the received signal.

12. The method of claim 11, wherein the PMI is calculated by the plurality of terminals and then included in a fed-back control signal.

13. The method of claim 12, wherein the PMI is obtained when the plurality of terminals estimate a backward channel from the relay and calculate the PMI based on the estimated result.

14. The method of claim 10, wherein estimating the channel between the plurality of terminals is performed based on a sounding reference signal included in the received signal.

15. The method of claim 14, wherein the precoded signal is a signal from which the sounding reference signal is removed and into which a user-specific reference signal is inserted.

16. The method of claim 10, further comprising determining whether self-interference cancellation (SIC) is performable by the plurality of terminals.

17. The method of claim 16, wherein determining whether the self-interference cancellation (SIC) is performable by the plurality of terminals is performed based on an SIC indicator included in the received signal.

18. The method of claim 17, when the SIC is performable by the plurality of terminals, the precoded signal is a signal into which a user-specific reference signal is inserted.

19. A non-transitory computer-readable storage medium encoded with computer-executable instructions that when executed cause a data processing system to:

receive a signal from a plurality of terminals;

estimate a channel between the plurality of terminals based on the received signal, and calculate a receiver matrix and a precoder; and

transmit a signal precoded by the precoder.

20. The non-transitory computer-readable storage medium of claim 19, wherein the computer-executable instructions further cause a data processing system to calculate the precoder based on a precoding matrix index (PMI) included in the received signal.