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Water-filling power allocation improving method and system in large-scale MIMO system

A water injection power distribution, large-scale technology, applied in power management, transmission system, radio transmission system, etc., can solve the problems of negative power, loss, antenna correlation increase, etc.

Active Publication Date: 2018-02-23
CENT SOUTH UNIV
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Problems solved by technology

This method is the optimal algorithm for power allocation, but it needs multiple iterations, the calculation complexity is large, and there will be negative power
In addition, due to the deployment of dozens or even hundreds of transmitting antennas on the base station side in the massive MIMO system, the correlation between antennas increases, and the transmission path with extremely poor channel conditions will greatly interfere with information transmission, resulting in errors in the transmission signal, Missing, resulting in a certain spectrum loss and power loss

Method used

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] A method for improving water injection power distribution in a massive MIMO system, comprising the following steps:

[0031] Step 1: Perform SVD decomposition on the coupled channel matrix in the massive MIMO system, and use the eigenvalues ​​of the channel matrix as the channel gains of r different transmission paths in the equivalent channel model of the massive MIMO system;

[0032] Generally, in massive MIMO systems (such as figure 1 As shown), the number of antennas at the transmitting end is greater than the number of antennas at the receiving end, that is, N>M. From channel estimation, the channel matrix H can be obtained:

[0033]

[0034] SVD decomposition is performed on this matrix, namely:

[0035]

[0036] Among them, λ 1 , lambda 2 ...λ M is the eigenvalue of the channel matrix;

[0037] Step 2: According to the ratio o...

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Abstract

The invention discloses a water-filling power allocation improving method and system in a large-scale MIMO system. The method comprises a first step of using a characteristic value of a channel matrixas a channel gain of r different transmission paths in an equivalent channel model of the large-scale MIMO system; a second step of allocating power for each channel and antenna according to a gain proportion of each channel; and a third step of calculating a capacity and energy efficiency of the large-scale MIMO system. The gain of each secondary channel in the equivalent channel model is obtained by decomposing the channel matrix, power is allocated to each channel and antenna according to the gain proportion of each channel, so that the spectrum efficiency and system energy efficiency of the large-scale MIMO system are improved without increasing transmission bandwidth and transmit power. The method is easy to realize and meets the requirement of green communication.

Description

technical field [0001] The invention belongs to the field of fifth-generation wireless communication, and in particular relates to a method and system for improving water injection power allocation in a massive MIMO system. Background technique [0002] 4G construction is in the ascendant, and research on 5G is in full swing around the world. As one of the core technologies in 5G network construction, massive MIMO has also become a hot research topic for various scientific research scholars and communication companies. The massive MIMO system mainly deploys a large number of antenna arrays on the base station side, makes full use of the degree of freedom of space, strives to serve more users on the same time-frequency resource, and greatly improves the spectral efficiency of the system without increasing the transmission bandwidth and transmission power. and energy efficiency, improving system performance and enabling explosive growth of mobile data. [0003] Power allocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/024H04W52/34H04W52/42
CPCH04B7/024H04B7/0413H04W52/34H04W52/346H04W52/42
Inventor 邓宏贵杨锦丽
Owner CENT SOUTH UNIV
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