Multiple input multiple output communication system using codebook corresponding to each reporting mode

Patent metadata

Field	Value
Publication number	US-9876553-B2
Application number	US-201113097719-A
Country	US
Kind code	B2
Filing date	Apr 29, 2011
Priority date	Apr 30, 2010
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A multiple input multiple output (MIMO) communication system using a first codebook and a second codebook is provided. The first codebook and the second codebook may independently exist, or may exist in a form of an overall codebook in which the first codebook and the second codebook are integrated with each other. A receiver may extract a first precoding matrix indicator from the first codebook, and may extract a second precoding matrix indicator from the second codebook. The receiver may also extract the first precoding matrix indicator and the second precoding matrix indicator from the overall codebook. The first precoding matrix indicator and the second precoding matrix indicator may be fed back to a transmitter. The transmitter may determine a precoding matrix based on the first precoding matrix indicator and the second precoding matrix indicator.

First claim

What is claimed is:

1. A communication method of a receiver in a wireless communication system, the communication method comprising:
obtaining a rank indicator;
obtaining a first precoding matrix indicator based on the rank indicator;
obtaining a second precoding matrix indicator associated with the first precoding matrix indicator;
when the rank indicator is 1,
transmitting the rank indicator,
transmitting the first precoding matrix indicator obtained based on a subset {0, 2, 4, 6, 8, 10, 12, 14} of a first codebook, the second precoding matrix indicator and a wideband channel quality index (CQI); and

when the rank indicator is 2,
transmitting the rank indicator, and
transmitting the first precoding matrix indicator obtained based on a subset {0, 2, 4, 6, 8, 10, 12, 14} of the first codebook, the second precoding matrix indicator and a wideband channel quality index(CQI),

wherein when the rank indicator is 1 or 2, the first precoding matrix indicator is 3 bits, and the second precoding matrix indicator is 1 bit.

2. The communication method of claim 1 , wherein a combination of the first precoding matrix indicator and the second precoding matrix indicator indicates a single recommended precoding matrix.

3. The communication method of claim 1 , wherein a combination of the first precoding matrix indicator and the second precoding matrix indicator indicates one of recommended precoding matrix candidates disclosed in the following Table 1:

TABLE 1

W (1) 0,0
W (1) 0,2

W (1) 4,0
W (1) 4,2

W (1) 8,0
W (1) 8,2

W (1) 12,0
W (1) 12,2

W (1) 16,0
W (1) 16,2

W (1) 20,0
W (1) 20,2

W (1) 24,0
W (1) 24,2

W (1) 28,0
W (1) 28,2

wherein

W

m
,
n

(
1
)

=

1

8

⁡

[

v
m

φ
n

⁢

v
m

]

,

φ
n

=

e

j
⁢

⁢
π
⁢

⁢

n
/
2

,

and ν m =[1 e j2πn/32 e j4πn/32 e j6πn/32 ] T , and
wherein W denotes a precoding matrix, v denotes a column vector, and m and n are variables.

4. The communication method of claim 1 , wherein a combination of the first precoding matrix indicator and the second precoding matrix indicator indicates one of recommended precoding matrix candidates disclosed in the following Table 2:

TABLE 2

W (2) 0,0,0
W (2) 0,0,1

W (2) 4,4,0
W (2) 4,4,1

W (2) 8,8,0
W (2) 8,8,1

W (2) 12,12,0
W (2) 12,12,1

W (2) 16,16,0
W (2) 16,16,1

W (2) 20,20,0
W (2) 20,20,1

W (2) 24,24,0
W (2) 24,24,1

W (2) 28,28,0
W (2) 28,28,1

wherein

W

m
,

m
′

,
n

(
2
)

=

1
4

⁡

[

v
m

v

Assignees

• Choi Joon-Il
• Clerckx Bruno
• Kim Ki Il
• Samsung Electronics Co Ltd

Inventors

• Choi Joon-Il
• Clerckx Bruno
• Kim Ki Il

Classifications

• H04B7/0481

  using subset selection of codebooks · CPC title

• H04B7/0639 Primary

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

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04B7/0478

  Special codebook structures directed to feedback optimisation · CPC title

• H04B7/10

  Polarisation diversity; Directional diversity · CPC title