US 8,014,453 B2 · Method, codebook, and base station for precoding

Abstract

A method, a codebook, and a Base Station (BS) for precoding are provided. The precoding method includes: obtaining a total uplink power of a User Equipment (UE); if the total uplink power is greater than ¾ of a rated total transmit power of antennas, selecting a codeword from a first codebook with imbalanced power between layers; otherwise, selecting a codeword from the first codebook and a second codebook with balanced power between layers, so as for precoding data to be transmitted according to the selected codeword. Thus, a loss of an antenna performance at a high signal-to-noise ratio is reduced, and the loss of the power amplification of the antenna is reduced if the transmit power of the antenna is restricted.

Claims13

Dependent claims

An apparatus, comprising:

at least one processor, configured to precode data using a codeword from a codebook consisting of exactly twelve code words, each codeword being based on a Binary Phase Shift Keying (BPSK) character set, the codewords being:
1
2
⁡
[
0
1
0
1
0
0
0
0
1
1
0
0
]
,
1
2
⁡
[
0
1
0
1
0
0
0
0
1
-
1
0
0
]
,
1
2
⁡
[
1
0
0
0
1
0
1
0
0
0
0
1
]
,
1
2
⁡
[
1
0
0
0
1
0
-
1
0
0
0
0
1
]
,
1
2
⁡
[
1
0
0
1
0
0
0
1
0
0
0
1
]
,
⁢
1
2
⁡
[
1
0
0
-
1
0
0
0
1
0
0
0
1
]
,
1
2
⁡
[
0
1
0
0
0
1
1
0
0
1
0
0
]
,
1
2
⁡
[
0
1
0
0
0
1
1
0
0
-
1
0
0
]
,
⁢
1
2
⁡
[
1
0
0
0
0
1
0
1
0
1
0
0
]
,
1
2
⁡
[
1
0
0
0
0
1
0
1
0
-
1
0
0
]
,
1
2
⁡
[
0
1
0
1
0
0
1
0
0
0
0
1
]
,
and
⁢
⁢
1
2
⁡
[
0
1
0
1
0
0
-
1
0
0
0
0
1
]
.
⁢

226 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/983,103Filed 31 Dec 2010 · continuation

Priority

CN 2009 1 00911087 Aug 2009

Published

US 2011/0090985 A121 Apr 2011

Granted

6 Sep 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04L 25/03929
Codebook-based design: with layer mapping, e.g. codeword-to layer design
H04B 7/043
Power distribution: using best eigenmode, e.g. beam forming or beam steering
H04B 7/0465
Taking physical layer constraints into account: taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into…
H04W 72/23
Control channels or signalling for resource management: in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Facts

Application

12/983,103Filed 31 Dec 2010 · continuation

Priority

CN 2009 1 00911087 Aug 2009

Published

US 2011/0090985 A121 Apr 2011

Granted

6 Sep 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04L 25/03929
Codebook-based design: with layer mapping, e.g. codeword-to layer design
H04B 7/043
Power distribution: using best eigenmode, e.g. beam forming or beam steering
H04B 7/0465
Taking physical layer constraints into account: taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into…
H04W 72/23
Control channels or signalling for resource management: in the downlink direction of a wireless link, i.e. towards a terminal

Method, codebook, and base station for precoding

Life of this patent

Abstract

Claims13

Method, codebook, and base station for precoding

Life of this patent

Abstract

Claims13