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An Uplink Antenna Selection Method for Multi-user Massive MIMO System

An antenna selection and multi-user technology, applied in diversity/multi-antenna systems, transmission systems, radio transmission systems, etc., can solve problems affecting base station diversity branches, decrease system reachable capacity, reduce system capacity gain, etc., and achieve performance Reliable, reduced spatially correlated channel effects and channel estimation error effects on performance, low cost effects

Active Publication Date: 2019-09-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although massive MIMO technology has great application potential, it still faces many challenges. First, due to factors such as antenna array structure and volume, the spatial isolation between array elements is limited, and there will inevitably be a certain spatial correlation. For the uplink, the anisotropy caused by the insufficient spatial isolation of base station antennas will affect all diversity branches on the base station side, resulting in a decrease in the reachable capacity of the system
Secondly, due to the imperfect channel state information (Channel State Information, CSI) and complex wireless channel fading environment, the channel estimation error will reduce the system capacity gain

Method used

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  • An Uplink Antenna Selection Method for Multi-user Massive MIMO System

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Embodiment 1

[0064] In this embodiment, the application scenario is single-antenna multi-user, that is, the number of single-antenna users in a multi-user massive MIMO system is K, and the number of base station antennas is M.

[0065] In a single-antenna multi-user application scenario, the antenna selection matrix includes: an overall-based antenna selection matrix and an individual-based antenna selection matrix.

[0066] (1) Antenna selection matrix based on the whole

[0067] The base station considers all users as a whole to perform antenna selection, and the antenna selection matrix generated at this time is a diagonal matrix S a =diag{s 11 ,s 22 ,...,s MM}, whose diagonal elements represent the antenna selection results, s ii =1 means that antenna i is selected; s ii =0 means that antenna i is not selected, i=1,...,M. Combining the received signals after antenna selection with maximum ratio, the output where G is the channel propagation matrix obtained by channel estimation...

Embodiment 2

[0141] In this embodiment, the application scenario is multi-antenna and multi-user, that is, the number of users in a multi-user massive MIMO system is K, the number of antennas configured for each user is N, the number of base station antennas is M, and the uplink antennas are selected as follows:

[0142] First, multi-antenna single-user uplink antenna selection is studied, and then extended to multi-user multi-antenna application scenarios. with x=[x 1 ,x 2 ,...,x N ] T Represents the signal vector transmitted by the user, where x k is the transmitted signal on the kth antenna of the user, and G is the M×N dimensional uncorrelated complex channel propagation matrix.

[0143] 1. Antenna selection under the condition of no channel estimation error

[0144] When there is spatial correlation between the user's multiple antennas and the base station's multiple antennas, according to the Kronecker model, the channel propagation matrix from the user to the base station is: ...

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Abstract

The invention discloses an antenna selection method for the uplink of multi-user large-scale MIMO system, characterized in the following steps: S1) determining the application scenarios of an antenna selection scheme; S2) dividing the application scenarios determined in step S1 into two antenna selection schemes, one being a multi-user integration based antenna selection scheme and the other being an multi-user individual based antenna selection scheme; S3) establishing antenna selection matrixes under the antenna selection conditions based on the two antenna selection schemes obtained respectively in step 2, and further establishing antenna selection optimization models; and S4) using the ROMP algorithm to solve and assess the two antenna selection optimization models for the best antenna selection scheme. The final antenna selection scheme is a performance reliable one and costs less. With the antenna selection scheme of the present invention, the performance of the whole antenna selection scheme can be reached.

Description

technical field [0001] The invention relates to the technical field of antenna selection, in particular to an uplink antenna selection method of a multi-user massive MIMO system. Background technique [0002] Multiple input multiple output (Multi-input Multi-output, MIMO) technology refers to the configuration of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end, so that signals can be sent and received through multiple antennas, thereby improving transmission quality (diversity improves reliability) , multiplexing improves effectiveness). MIMO technology can make full use of space resources and greatly increase communication capacity through multiple transmissions and multiple receptions. [0003] In communication, multi-user MIMO (Multi-user MIMO, MU-MIMO) refers to the configuration of multiple antennas on the base station side, and single or a small number of multiple antennas on the user side. The base station uses the same...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/06
Inventor 冯文江黄天聪刘国岭万情包涛涛唐冰蓝孔乾坤
Owner CHONGQING UNIV
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