Method for controlling transmit power in multichannel system, receive end, and transmit end

Patent metadata

Field	Value
Publication number	US-9510303-B2
Application number	US-201615048305-A
Country	US
Kind code	B2
Filing date	Feb 19, 2016
Priority date	Aug 20, 2013
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

The present invention discloses a method. The method includes: receiving, through N receive channels, N signals sent by a transmit end, where the N signals include a channel estimation sequence; determining a total receive power of an i th receive channel; determining a channel matrix according to a received channel estimation sequence; determining a useful receive power of the i th receive channel according to the channel matrix and the total receive power of the i th receive channel; determining, according to the channel matrix and a receive power that is required by single-channel communication, a receive power required by the i th receive channel; and sending a power adjustment message to the transmit end if the useful receive power of the i th receive channel does not match the receive power required by the i th receive channel, so that the transmit end adjusts a transmit power of an i th signal.

First claim

What is claimed is:

1. A method for controlling a transmit power in a multichannel system, the method comprising:
receiving, through N receive channels, N signals sent by a transmit end, wherein an i th signal in the N signals is sent on an i th transmit channel in N transmit channels by the transmit end, each signal in the N signals comprises a channel estimation sequence, N is a positive integer, N≧2, and i=1, 2, . . . , N;
determining a total receive power of an i th receive channel in the N receive channels;
determining a channel matrix H according to a received channel estimation sequence;
determining a useful receive power of the i th receive channel according to the channel matrix H and the total receive power of the i th receive channel, wherein the useful receive power of the i th receive channel indicates a receive power, which is occupied by the i th signal, in the total receive power of the i th receive channel;
determining, according to the channel matrix H and a receive power that is required by single-channel communication, a receive power required by the i th receive channel; and
sending a power adjustment message to the transmit end if the useful receive power of the i th receive channel does not match the receive power required by the i th receive channel, so that the transmit end adjusts a transmit power of the i th signal according to the power adjustment message.

2. The method according to claim 1 , wherein sending a power adjustment message to the transmit end if the useful receive power of the i th receive channel does not match the receive power required by the i th receive channel comprises:
sending the power adjustment message to the transmit end if the useful receive power of the i th receive channel is less than the receive power required by the i th receive channel, wherein the power adjustment message carries a request for increasing a transmit power, so that the transmit end increases the transmit power of the i th signal according to the request for increasing a transmit power; or
sending the power adjustment message to the transmit end if the useful receive power of the i th receive channel is greater than the receive power required by the i th receive channel, wherein the power adjustment message carries a request for reducing a transmit power, so that the transmit end reduces the transmit power of the i th signal according to the request for reducing a transmit power.

3. The method according to claim 1 , wherein the method further comprises:
skipping sending the power adjustment message to the transmit end if the useful receive power of the i th receive channel matches the receive power required by the i th receive channel.

4. The method according to claim 1 , wherein determining a useful receive power of the i th receive channel according to the channel matrix H and the total receive power of the i th receive channel comprises:
determining the useful receive power P rx i (t) of the i th receive channel according to the following equation:
P rx i ( t )= P total i ( t )· R i ,

wherein P rx i (t) represents the total receive power of the i th receive channel, R i represents a proportion of the i th signal to a receive signal of the i th receive channel, and

R
i

=



h
ii



2

∑

j
=
1

N

⁢



h
ij



2

,

wherein h ii and h ij are corresponding elements in the channel matrix H, and

H
=

[

h
11

h
12

…

h

1
⁢
N

h
21

h
22

…

h

2
⁢
N

…

…

…

…

h

N
⁢

⁢
1

h

N
⁢

⁢
2

…

h
NN

]

.

5. The method according to claim 1 , wherein determining, according to the channel matrix H and a receive power that is required by single-channel communication, a receive power r

Assignees

• Huawei Tech Co Ltd

Inventors

• Chen Zihuan

Classifications

• Y02B60/50

  Cross-Sectional Technologies · mapped topic

• H04W52/42

  in systems with time, space, frequency or polarisation diversity · CPC title

• H04B7/0617

  for beam forming · CPC title

• H04W52/245

  taking into account received signal strength · CPC title

• H04B7/0619

  using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001) · CPC title