Two-way relay apparatus and method thereof

• US 9,660,714 B2
• Filed: 06/13/2014
• Issued: 05/23/2017
• 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, Park, Haewook, Song, Changick
• Primary Examiner(s): Roberts, Brian
• Assistant Examiner(s): Haque, Abu-Sayeed
• Application Number:
  US14/304,789
• Publication Number:
  US 20140369255A1
• Time in Patent Office: 1,075 Days
• 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:

at least one transceiver; and

at least one processor coupled to the at least one transceiver,

wherein the at least one processor is configured to;

receive, from a terminal, a first signal comprising a self-interference cancellation (SIC) indicator;

determine, based on the SIC indicator, availability of SIC for the terminal; and

transmit, to the terminal, a second signal precoded based on the first signal,

wherein the second signal comprises a user-specific reference signal (URS) corresponding to the terminal, and

wherein the URS is used, by the terminal, for performing the SIC.

2. The apparatus of claim 1, wherein the second signal is precoded based on a precoder, and

wherein the precoder is determined based on a precoding matrix index (PMI) included in the first signal.

3. The apparatus of claim 2, wherein the PMI is calculated by the terminal.

4. The apparatus of claim 1, wherein the second signal is precoded based on a precoder, and

wherein the precoder is determined based on a sounding reference signal included in the first signal.

5. The apparatus of claim 4, wherein the at least one processor is further configured to:

remove a sounding reference signal (SRS) from the first signal; and

add the URS to a location of the SRS.

6. The apparatus of claim 1, wherein the SIC indicator is included in the first signal.

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

receiving, from a terminal, a first signal comprising a self-interference cancellation (SIC) indicator;

determining, based on the SIC indicator, availability of SIC for the terminal; and

transmitting, to the terminal, a second signal precoded based on the first signal,

wherein the second signal comprises a user-specific reference signal (URS) corresponding to the terminal, and

wherein the URS is used, by the terminal, for performing the SIC.

8. The method of claim 7, wherein the second signal is precoded based on a precoder, and

wherein the precoder is determined based on a precoding matrix index (PMI) included in the first signal.

9. The method of claim 8, wherein the PMI is calculated by the terminal.

10. The method of claim 7, wherein the second signal is precoded based on a precoder, and

wherein the precoder is determined based on a sounding reference signal included in the first signal.

11. The method of claim 10, further comprising:

removing a sounding reference signal (SRS) from the first signal; and

adding the URS to a location of the SRS.

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

at least one transceiver; and

at least one processor coupled to the at least one transceiver, wherein the at least one processor is configured to;

transmit, to a relay station, a first signal comprising a self-interference cancellation (SIC) indicator;

receive, from the relay station, a second signal precoded based on the first signal the second signal comprising a user-specific reference signal (URS) corresponding to the terminal; and

perform (SIC) based on the URS,

wherein the SIC indicator is used to determine availability of SIC for the terminal by the relay station.

13. The apparatus of claim 12, wherein the SIC indicator is included in the first signal.

14. The apparatus of claim 12, wherein the second signal is precoded, by the relay station, based on a precoder, and

wherein the precoder is determined, by the relay station, based on a sounding reference signal (SRS) included in the first signal.

15. The apparatus of claim 14, wherein the at least one processor is further configured to:

receive at least one reference signal from the relay station; and

determine a precoding matrix index (PMI) based on the at least one reference signal,

wherein the first signal includes the PMI.