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A method and device for power distribution of multi-user equipment

A user equipment and multi-user technology, applied in the field of power allocation methods and devices for multi-user equipment, can solve the problems of no gain or negative gain in spatial multiplexing, power not conforming to the actual state of the system, etc.

Active Publication Date: 2019-02-12
SHANGHAI HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, the power allocated to multiple users using existing methods does not conform to the actual state of the system, resulting in no gain or negative gain for spatial multiplexing

Method used

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  • A method and device for power distribution of multi-user equipment
  • A method and device for power distribution of multi-user equipment
  • A method and device for power distribution of multi-user equipment

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Embodiment Construction

[0060] A method and device for determining a downlink weight vector of multi-user equipment disclosed in the embodiment of the present application can be applied in a MIMO communication system. The model and parameter relationship of the MIMO communication system are as follows:

[0061] The equivalent transmission matrix defining the downlink MIMO system is as follows:

[0062]

[0063] Then the system transmission model is:

[0064] r=GS+z

[0065] Among them, r is the received signal, G is the equivalent transmission channel, S is the source vector, and z is the additive complex noise. Since it is a downlink scenario, joint reception is not considered.

[0066] Assume that the transmitter can only obtain an estimate of the channel direction of the user equipment It satisfies the following relationship with the true value and estimated value of the channel:

[0067]

[0068] in unknowable.

[0069] Downlink weight vector of user equipment is the final undeterm...

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Abstract

The application provides a power distribution method and a power distribution device for multiple user devices. A base station obtains accuracy alpha<l> of channel state information of each user device and a weight projection expected matrix beta, determines a power weight coefficient matrix W according to the accuracy alpha<l> of channel state information and the weight projection expected matrix beta, and then uses a formula WAP=Wb to determine a transmitted power vector P, wherein each element value in the transmitted power vector P represents the power distributed for each user device in the multiple user devices. Visibly, the accuracy alpha<l> of channel state information is used as a reference for power distribution in the application, so that the power distribution is closer to the actual condition of a communication system in comparison with the condition that the accuracy of channel state information of each user device is assumed to be an ideal value in the prior art. Therefore, the power distribution method and the power distribution device of the application could obtain a higher spatial multiplexing gain.

Description

technical field [0001] The present application relates to the communication field, and in particular to a method and device for power allocation of multi-user equipment. Background technique [0002] If multiple antennas are used simultaneously at the transmitting end and the receiving end, a multiple input multiple output (Multiple Input Multiple Output, MIMO) system is formed. Existing studies have shown that MIMO systems have higher channel capacity. At the transmitting end, the data stream is divided into multiple sub-data streams and transmitted from different antennas, which can increase the transmission rate without increasing the transmission power and bandwidth. This technology is called spatial multiplexing (spatial multiplexing) technology, and the increase in transmission rate brought about is called spatial multiplexing gain. [0003] Allocating power for multiple user equipment is one of the key points of MIMO communication. In the prior art, the power of eac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/42H04B7/0413
CPCH04B7/0413H04W52/42
Inventor 王智鹰蒋培刚
Owner SHANGHAI HUAWEI TECH CO LTD
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