Communication method in relay nodes and destination nodes for aligned interference neutralization in interference channel

Patent metadata

Field	Value
Publication number	US-9432106-B2
Application number	US-201213550698-A
Country	US
Kind code	B2
Filing date	Jul 17, 2012
Priority date	Dec 2, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A communication method in relay nodes and destination nodes for neutralization of aligned interferences in an interference channel is provided. A communication method of a first relay node in a network including a first source node, the first relay node, a first destination node, a second source node, a second relay node, and a second destination node, includes receiving, from the first source node, streams X and Y. The communication method further includes receiving, from the second source node, a stream Z. The communication method further includes generating a signal in which the streams Y and Z are aligned in a space. The communication method further includes transmitting, to the first destination node and the second destination node, the stream X and the signal.

First claim

What is claimed is:

1. A communication method of a second relay node (R 2 ) in a network comprising a first source node (S 1 ), a first relay node (R 1 ), a first destination node (D 1 ), a second source node (S 2 ), the second relay node (R 2 ), and a second destination node (D 2 ), the communication method comprising:
receiving, at the second relay node (R 2 ), streams X and Y from the first source node (S 1 );
receiving, at the second relay node (R 2 ), a stream Z from the second source node (S 2 );
generating an aligned signal (X+Z) at the second relay node (R 2 ) in which the streams X and Z are aligned in a predetermined space based on a reception beamforming vector, the reception beamforming vector being orthogonal to a channel direction in which the second relay node (R 2 ) receives the stream Y; and
transmitting the aligned signal (X+Z) from the second relay node (R 2 ) to the first destination node (D 1 ) and the second destination node (D 2 ) so that the aligned signal (X+Z) is to be received by the first destination node (D 1 ) in an opposite direction with respect to an aligned signal (Y+Z), which is generated and transmitted by the first relay node (R 1 ).

2. The communication method of claim 1 , wherein the generating of the aligned signal (X+Z) comprises:
generating the aligned signal (X+Z) based on an indicator indicating the predetermined space, the indicator being in a predetermined codebook.

3. The communication method of claim 1 , further comprising:
determining a transmission beamforming (BF) vector of the first source node (S 1 ) based on a vector indicating the predetermined space, the transmission BF vector being used to transmit the stream X.

4. The communication method of claim 1 , further comprising:
determining a transmission BF vector of the second source node (S 2 ) based on a vector indicating the predetermined space, the transmission BF vector being used to transmit the stream Z.

5. The communication method of claim 1 , the transmitting comprises:
transmitting the aligned signal (X+Z) to the second destination node (D 2 ), so that the aligned signal (X+Z) is to be received by the second destination node (D 2 ) in an opposite direction with respect to stream X transmitted by the first relay node (R 1 ).

6. The communication method of claim 1 , wherein the aligned signal (X+Z) and the stream X, which is transmitted from the first relay node (R 1 ), are received in opposite directions by the second destination node (D 2 ).

7. A non-transitory computer-readable storage medium storing program instructions controlling a processor to perform the method of claim 1 .

8. A communication method of a first relay node (R 1 ) in a network comprising a first source node (S 1 ), the first relay node (R 1 ), a first destination node (D 1 ), a second source node (S 2 ), a second relay node (R 2 ), and a second destination node (D 2 ), the communication method comprising:
receiving, at the first relay node (R 1 ), streams X and Y from the first source node (S 1 );
receiving, at the first relay node (R 1 ), stream Z from the second source node (S 2 ),
wherein the streams Z and Y are aligned in a predetermined space;
transmitting a signal comprising the stream X and an aligned signal (Y+Z) of the streams Z and Y to the first destination node (D 1 ), so that the aligned signal (Y+Z) is to be received by the first destination node (D 1 ) in an opposite direction with respect to an aligned signal (X+Z), which is generated and transmitted by the second relay node (R 2 ); and
transmitting the signal to the second destination node (D 2 ), so that the stream X is to be received by the second destination node (D 2 ) in an opposite direction with respect to the aligned signal (X+Z).

9. A communication method of a first destination node (D 1 ) in a network comprising a first source node (S 1 ), a first relay node (R 1 ), the first destination node (D 1 ), a second source node (S 2 ), a second relay node (R 2 ), and a second destination node (D 2 ), the communication method comprising:
receiving, at the first destination node (D 1 ), an aligned signal (X+Z) from the second relay node (R 2 ), wherein streams X and Z are aligned in the aligned signal (X+Z);
receiving, at the first destination node (D 1 ), the stream X and an aligned signal (Y+Z) from the first relay node (R 1 ) in which the streams Y and Z are aligned; and
removing the stream Z at the first destination node (D 1 ) to neutralize an interference, wherein the aligned signal (X+Z) and the aligned signal (Y+Z) are received in opposite directions, and
wherein the stream X and the stream Z are aligned, by the second relay node (R 2 ), in a predetermined space based on a reception beamforming vector, the reception beamforming vector being orthogonal to a channel direction in which the second relay node (R 2 ) receives the stream Y from the first source node (S 1 ).

10. The communication method of claim 9 , wherein the removing comprises:
adjusting a size of each of the aligned signal (X+Z) and the aligned signal (Y+Z) based on a signal strength ratio of streams included in each of the aligned signal (X+Z) and the aligned signal (Y+Z) to neutralize the interference.

11. The communication method of claim 9 , further comprising:
determining a feedback indicator based on information associated with a communication environment, the feedback indicator indicating which one of the first destination node (D 1 ) and the second destination node (D 2 ) provides, as a feedback to the first relay node (R 1 ), information on a transmission BF vector.

12. The communication method of claim 11 , wherein the information associated with the communication environment comprises a communication topology, or a channel communication status, or a fairness for each user, or any combination thereof.

13. The communication method of claim 11 , further comprising:
providing, as the feedback to the first relay node (R 1 ), information on a third transmission BF vector based on the feedback indicator, the third transmission BF vector being used by the first relay node (R 1 ) to transmit the stream X.

14. The communication method of claim 11 , further comprising:
providing, as the feedback to the first relay node (R 1 ), information on the second transmission BF vector based on the feedback indicator, the second transmission BF vector being used by the first relay node (R 1 ) to transmit the aligned signal (Y+Z).

15. A communication method of a second destination node (D 2 ) in a network comprising a first source node (S 1 ), a first relay node (R 1 ), a first destination node (D 1 ), a second source node (S 2 ), a second relay node (R 2 ), and the second destination node (D 2 ), the communication method comprising:
receiving, at the second destination node (D 2 ), an aligned signal (X+Z) from the second relay node (R 2 ), wherein streams X and Z are aligned in the aligned signal (X+Z);
receiving, at the second destination node (D 2 ), the stream X and an aligned signal (Y+Z) from the first relay node (R 1 ), wherein the streams Y and Z are aligned in the aligned signal (Y+Z); and
removing the stream X at the second destination node (D 2 ) to neutralize an interference,
wherein the stream X and the aligned signal (X+Z) are received in opposite directions, and
wherein the stream X and the stream Z are aligned, by the second relay node (R 2 ), in a predetermined space based on a reception beamforming vector, the reception beamforming vector being orthogonal to a channel direction in which the second relay node (R 2 ) receives the stream Y from the first source node

Assignees

• Shin Won Jae
• Shin Chang Yong
• Samsung Electronics Co Ltd

Inventors

• Shin Won Jae
• Shin Chang Yong

Classifications

• H04B7/0617

  for beam forming · CPC title

• H04B7/1555 Primary

  Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04B7/14 Primary

  Relay systems · CPC title