Data transmission device and method in a wireless communications system

Patent metadata

Field	Value
Publication number	US-9553645-B2
Application number	US-201414514075-A
Country	US
Kind code	B2
Filing date	Oct 14, 2014
Priority date	Dec 21, 2008
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

The present invention provides a data transmission device and method in a wireless communication system. The device comprises a processor which is connected with the M antennas and which is formed so as to generate data to be transmitted through the M antennas, on the basis of a precoding matrix; the precoding matrix is generated based on a plurality of matrices; and a first matrix, which is one matrix among the plurality of matrices, is selected from within a codebook for N antennas (where N<M).

First claim

The invention claimed is:

1. A method of transmitting a control signal related to a precoding scheme in a wireless communication system, the method comprising:
receiving, by a wireless device from a network device, codebook subset information restricting a possible precoding matrix to be selected by the wireless device from a plurality of possible precoding matrices to a precoding matrix suitable for a channel;
selecting, by the wireless device, an Mt×R precoding matrix based on the codebook subset information,
wherein the selected Mt×R precoding matrix is to be used for a plurality of antenna ports of the network device; and
transmitting, by the wireless device to the network device, information on the selected Mt×R precoding matrix,
wherein Mt denotes a number of the plurality of antenna ports and R denotes a number of layers for the restricted precoding matrix,
wherein the Mt×R precoding matrix is the restricted precoding matrix and is configured in a form of

(

w
⁢

⁢

1
·
Q

⁢

⁢
1

w
⁢

⁢

1
·
Q

⁢

⁢
2

w
⁢

⁢

2
·
Q

⁢

⁢
3

-
w

⁢

⁢

2
·
Q

⁢

⁢
4

)

,

wherein Q1 denotes a first element matrix for the Mt×R precoding matrix, Q2 denotes a second element matrix for the Mt×R precoding matrix, Q3 denotes a third element matrix for the Mt×R precoding matrix, and Q4 denotes a fourth element matrix for the Mt×R precoding matrix,
wherein w1 denotes a weight for the first and second element matrices, and w2 denotes a weight for the third and fourth element matrices, and
wherein each of the first, second, third and fourth element matrices has Nt rows, wherein Nt is defined by Nt=Mt/2.

2. The method of claim 1 , wherein the Mt is set to 8 and R is set to 2.

3. A wireless device for transmitting a control signal related to a precoding scheme in a wireless communication system, the apparatus comprising:
a radio frequency unit configured to transmit and receive a signal; and
a processor coupled to the radio frequency unit and configured to:
receive, from a network device, codebook subset information restricting a possible precoding matrix to be selected by the processor from a plurality of possible precoding matrices to a precoding matrix suitable for a channel;
select an Mt×R precoding matrix based on the codebook subset information,
wherein the selected Mt×R precoding matrix is to be used for a plurality of antenna ports of the network device;
control the radio frequency unit to transmit information on the selected Mt×R precoding matrix to the network device,

wherein Mt denotes a number of the plurality of antenna ports and R denotes a number of layers for the restricted precoding matrix,
wherein the Mt×R precoding matrix is the restricted precoding matrix and is configured in a form of

(

w
⁢

⁢

1
·
Q

⁢

⁢
1

w
⁢

⁢

1
·
Q

⁢

⁢
2

w
⁢

⁢

2
·
Q

⁢

⁢
3

-
w

⁢

⁢

2
·
Q

⁢

⁢
4

)

,

Assignees

• Lg Electronics Inc

Inventors

• Lee Moon Il
• Koo Ja Ho
• Ko Hyun Soo
• Chung Jae Hoon
• Ihm Bin Chul
• Kwon Yeong Hyeon

Classifications

• H04B7/0639

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

• H04B7/0469 Primary

  taking special antenna structures, e.g. cross polarized antennas into account · CPC title

• H04B7/0465

  taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account · CPC title

• H04B7/0413 Primary

  MIMO systems · CPC title

• H04B7/0658

  Feedback reduction · CPC title