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Stratospheric large-scale MIMO client beamforming method

A beamforming and large-scale technology, applied in the field of stratospheric wireless communication, can solve the problems of large amount of calculation, difficult advection communication system, and large amount of data interaction, and achieve the effect of reducing energy loss and reducing requirements

Inactive Publication Date: 2018-12-14
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

For the current interference suppression method for large-scale MIMO systems on the ground, it is difficult to apply to the advection communication system due to the large amount of calculation and the large amount of data interaction.

Method used

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  • Stratospheric large-scale MIMO client beamforming method
  • Stratospheric large-scale MIMO client beamforming method
  • Stratospheric large-scale MIMO client beamforming method

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Embodiment Construction

[0039] 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 modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0040] The invention provides a stratospheric massive MIMO user end beamforming method, which considers the case of single data flow, that is, the base station transmits a single data flow to each user. The user end calculates the beamforming vector according to the channel correlation matrix to each base station. In the phase of uplink pilot transmission, since the beam points to the target base station, the pilot pollution is alleviated and the accuracy of channel state information is improved; ...

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Abstract

A large-scale MIMO us terminal beam forming method for stratosphere comprise that following steps: step 1: a large-scale MIMO platform for stratosphere sends downlink pilot signal; step 2: a user maximizes the signal-pilot pollution power ratio by using the receiver correlation matrix; step 3, a needle solves the SPR maximization problem through a positive semi-definite relaxation method to obtaina user end beamforming vector; Step 4: adopting the beamforming vector obtained in step 3, the user performs beamforming operation in uplink pilot transmission and downlink data transmission. The invention has the advantages of low information exchange quantity, low processing complexity of the base station, wide application range, no additional feedback and the like.

Description

technical field [0001] The present invention relates to a stratospheric wireless communication method, in particular to a stratospheric large-scale MIMO (Multiple Input Multiple Output, multiple input multiple output) client beamforming method. Background technique [0002] In a multi-user MIMO system, Channel State Information at the Transmitter (CSIT, Channel State Information at the Transmitter) plays an important role in system performance. Accurate modeling of CSIT error conditions can provide a basis for subsequent system performance analysis and precoding algorithm design. In a cellular network based on time division duplexing, a user (UE) periodically sends an uplink pilot signal, and the base station obtains CSIT by estimating the pilot signal of the user in the cell. In the estimation process, the CSIT error is mainly caused by the following factors: because the transmission of the pilot is periodic, there is a delay between the estimated time of the CSIT and the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0452H04B7/06
CPCH04B7/0452H04B7/0617
Inventor 袭奇何晨蒋铃鸽练柱先
Owner SHANGHAI JIAO TONG UNIV
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