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Stratospheric large-scale MIMO user grouping and precoding method and system

A user grouping, large-scale technology, used in transmission systems, radio transmission systems, electrical components, etc., to solve problems such as high complexity

Active Publication Date: 2019-05-21
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] To sum up, the existing two-layer precoding schemes all use the correlation matrix as the design criterion, involving the SVD of the correlation matrix, which has high complexity

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  • Stratospheric large-scale MIMO user grouping and precoding method and system
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  • Stratospheric large-scale MIMO user grouping and precoding method and system

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Embodiment Construction

[0294] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0295] According to a kind of stratospheric massive MIMO user grouping and precoding method provided by the present invention, comprising:

[0296] Optimization problem design steps: on the basis of assuming that the multi-users of the stratospheric massive MIMO communication system have been grouped, design the optimization problem according to the outer layer precoding matrix and the inner layer precoding matrix;

[0297] Optimization problem simplification step: use matrix norm inequality and null sp...

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Abstract

The invention provides a stratospheric large-scale MIMO user grouping and precoding method and system, and the method comprises the steps: an optimization problem design step: designing an optimization problem according to an outer-layer precoding matrix and an inner-layer precoding matrix on the basis that it is assumed that multiple users of a stratospheric large-scale MIMO communication systemare grouped; Optimization problem simplification step: carrying out optimization problem simplification; According to the method, a matrix norm inequality and a zero space criterion are adopted, an obtained optimization problem is simplified, the power of a signal is explored to be mainly concentrated on a statistical intrinsic mode StacticalEgigades of a channel, and the statistical intrinsic mode StacalEgigades are obtained. In the invention, the CSI of the effective channel for designing the inner-layer precoding matrix is also effectively reduced, so that the grouping scheme and the precoding scheme can effectively explore the key technology of the stratospheric large-scale MIMO communication system.

Description

technical field [0001] The present invention relates to a stratospheric wireless communication method, in particular to a stratospheric massive MIMO user grouping and precoding method and system. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the requirements of large traffic volume, high speed and high spectrum efficiency of wireless communication have become increasingly urgent, and spectrum resources have become increasingly scarce. In the next generation of wireless communication technology, the high-altitude platform is considered as a new alternative technology, which has attracted worldwide attention. Without increasing the transmission power and the transmission bandwidth, the Massive Multiple-input Multiple-output (MIMO) technology can obviously increase the performance of the wireless communication system. Due to the limited channel coherence time, channel estimation is a difficult problem for Freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/0456
Inventor 练柱先蒋铃鸽何晨何迪
Owner SHANGHAI JIAO TONG UNIV
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