Communication apparatus and precoding method based on multiple cells and multiple users

Patent metadata

Field	Value
Publication number	US-9231795-B2
Application number	US-91786910-A
Country	US
Kind code	B2
Filing date	Nov 2, 2010
Priority date	Jan 18, 2010
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

Provided are a communication apparatus that may generate a precoding matrix including precoding vectors to cancel or align interference existing in a plurality of terminal devices based on location of the terminal devices, and a terminal device that may estimate a channel formed between the terminal device and the communication apparatus to cancel or align interference signals.

First claim

What is claimed is:

1. A precoding method, comprising:
aligning, in the same space, different interference channels corresponding to different terminal devices included in a cell edge region of an interference base station; and
generating a reception beamforming vector of one or more terminal devices included in a cell edge region of a serving base station, based on the aligned interference channels of the interference base station,
wherein the interference channels comprise a first interference channel of a first terminal and a second interference channel of a second terminal, and
wherein the aligning in the same space comprises calculating a rank of the first interference channel and the second interference channel to have a value of 1 or a proximate value of 1.

2. The precoding method of claim 1 , further comprising:
generating a precoding vector of the one or more terminal devices included in the cell edge region of the serving base station, based on a basis vector of each of the interference channels of the interference base station that are aligned in the same space, and an interference channel of the serving base station.

3. The precoding method of claim 2 , further comprising: transmitting, to the one or more terminal devices included in the cell edge region of the serving base station, at least one of the reception beamforming vector and data that is precoded using the generated precoding vector.

4. The precoding method of claim 1 , wherein the aligning comprises aligning, in the same space, the interference channels of the one or more terminal devices included in the cell edge region of the interference base station to be partially overlapped with each other.

5. The precoding method of claim 1 , wherein the aligning in the same space is performed by calculating rank(w [1,ī] H H i [1,ī] H , w [2,ī] H H i [2,ī] H )≈1.

6. The precoding method of claim 1 , wherein the reception beamforming vector is obtained by using the aligned effective interference channels in the same space to discern the direction of the effective interference channels with respect to a basis vector.

7. The precoding method of claim 6 , wherein the reception beamforming vector is obtained by calculating

h

i
_

ic

=

1

α
1

[

i
_

]

⁢

H
i

[

1
,

i
_

]

H

⁢

w

[

1
,

i
_

]

=

1

α
2

[

i
_

]

⁢

H
i

[

2
,

i
_

]

H

⁢

w

[

2
,

i
_

]

where

1

α
1

[

i
_

]

⁢

w

[

1
,

i
_

]

corresponds to a vector obtained by scaling the reception beamforming vector of a first terminal device served by the interference base station ī, and

1

α
2

[

i
_

]

⁢

w

[

2
,

i
_

]

corresponds to a vector obtained by scaling the reception beamforming vector of the second terminal device.

8. A communication apparatus, comprising:
an interference channel alignment unit configured to align, in the same space, different interference channels corresponding to different terminal devices included in a cell edge region of an interference base station; and
a reception beamforming vector generator configured to generate a reception beamforming vector of one or more terminal devices included in a cell edge region of a serving base station, based on the aligned interference channels of the interference base station,
wherein the interference channels comprise a first interference channel of a first terminal and a second interference channel of a second terminal, and
wherein the aligning in the same space comprises calculating a rank of the first interference channel and the second interference channel to have a value of 1 or a p

Assignees

• Shin Won Jae
• Lee Nam Yoon
• Hong Young Jun
• Shin Chang Yong
• Jang Kyung Hun
• Samsung Electronics Co Ltd

Inventors

• Shin Won Jae
• Lee Nam Yoon
• Hong Young Jun
• Shin Chang Yong
• Jang Kyung Hun

Classifications

• H04J11/0033

  by pre-cancellation of known interference, e.g. using a matched filter, dirty paper coder or Thomlinson-Harashima precoder (correlative coding in synchronous or start-stop systems H04L25/497) · CPC title

• H04J11/0059

  Out-of-cell user aspects · CPC title

• H04L25/03343 Primary

  Arrangements at the transmitter end · CPC title