Communications method and apparatus

Patent metadata

Field	Value
Publication number	US-11271615-B2
Application number	US-202117215387-A
Country	US
Kind code	B2
Filing date	Mar 29, 2021
Priority date	Sep 29, 2018
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

Example communications methods and apparatus are described. One example method includes generating a first signal by a base station. The base station performs cyclic delay diversity (CDD) weighted processing on the first signal to obtain a second signal, and performs densified beam weighted processing on the second signal to obtain a third signal. The third signal is sent by the base station via an antenna. According to the foregoing method, the CDD weighted processing is performed on the first signal generated by the base station, so that time diversity can be obtained when the first signal is transmitted. In addition, the densified beam weighted processing is performed on the second signal obtained after the CDD weighted processing, so that a quantity of beams scanned by the base station can be increased.

First claim

What is claimed is:

1. A communication method, comprising:
generating, by a base station, a first signal;
performing, by the base station, cyclic delay diversity (CDD) weighted processing on the first signal to obtain a second signal;
performing, by the base station, densified beam weighted processing on the second signal to obtain a third signal; and
sending, by the base station, the third signal; and
wherein the second signal and the first signal satisfy:

s
CDD

⁡

(
k
)

=

[

1

e

j
⁡

(

θ
⁡

(
k
)

)

]

*

s
⁡

(
k
)

,

wherein S CDD (k) is the second signal, wherein s(k) is the first signal, wherein

[

1

e

j
⁡

(

θ
⁡

(
k
)

)

]

is a CDD weight matrix, wherein

θ
⁡

(
k
)

=

2
⁢
π
⁢

⁢
D
⁢

k

N
FFT

,

k
=
0

,
1
,
…
⁢

,

N
FFT

-
1

,

wherein D is a delay length and wherein N FFT is a Fast Fourier Transformation (FFT) length.

2. The method according to claim 1 , wherein a value of D is one or two time domain sampling points.

3. The method according to claim 1 , wherein the third signal and the second signal satisfy:

s
Out

⁡

(
k
)

=

[

W
⁡

(
m
)

0

0

W
⁡

(
m
)

]

*

s
CDD

⁡

(
k
)

,

wherein s out (k) is the third signal, wherein

[

W
⁡

(
m
)

0

0

W
⁡

(
m
)

]

is a beam weight matrix, wherein

W
⁡

(

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Daowei
• Guo Jiang
• Zhang Zhe
• Yang Xiaobo

Classifications

• H04B7/0413 Primary

  MIMO systems · CPC title

• H04B7/0408 Primary

  using two or more beams, i.e. beam diversity · CPC title

• H04B7/04

  using two or more spaced independent antennas · CPC title

• H04B7/0671 Primary

  using different delays between antennas · CPC title

• H04B7/0617

  for beam forming · CPC title