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Multi-user hybrid beamforming algorithm and implementation device in millimeter wave massive mimo-ofdm system

A MIMO-OFDM and hybrid beam technology, which is applied in the field of hybrid beamforming algorithms and corresponding implementation devices, can solve problems such as insufficient utilization of millimeter wave spectrum resources.

Inactive Publication Date: 2021-05-04
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] Most of the current hybrid beamforming technologies use single-user or multi-user single-carrier technology, that is, each user is equipped with a single sub-carrier, which does not make full use of the rich spectrum resources of mmWave

Method used

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  • Multi-user hybrid beamforming algorithm and implementation device in millimeter wave massive mimo-ofdm system
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  • Multi-user hybrid beamforming algorithm and implementation device in millimeter wave massive mimo-ofdm system

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Embodiment Construction

[0005] Step 1: System Model

[0006] Such as figure 1 , where F B [n] and F R Respectively represent the digital encoder and analog encoder corresponding to the terminal carrier n of the base station, and the number of data streams sent to each user is N s , the number of RF links corresponding to the base station is N R , the number of antennas is N t , Indicates the analog encoder corresponding to the kth user, Indicates the digital encoder corresponding to subcarrier n in the kth user.

[0007] The signal corresponding to subcarrier n received by user k can be expressed as (1):

[0008]

[0009] in is the equivalent baseband channel corresponding to subcarrier n, then the SNR of user k corresponding to subcarrier n can be expressed as (2):

[0010]

[0011] Here we use the signal-to-leakage-noise ratio as the standard to design the mixed coding matrix corresponding to different subcarriers of the base station and the user end. The mixed coding matrix corre...

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Abstract

The invention discloses an algorithm and an implementation device for multi-user hybrid beamforming in a millimeter-wave large-scale MIMO-OFDM system, which are used to realize a multi-user hybrid beamforming design in a large-scale MIMO-OFDM system. The algorithm is specifically divided into three steps. The first step is to obtain the lower limit of the sum of the base station and user radio frequency link gains under all subcarriers according to the Jensen inequality, and design a common analog coding and combining matrix according to the maximization of the lower limit; the second step , when the common analog coding and combining matrix are known, the digital coding matrix corresponding to all subcarriers at the base station is obtained according to the maximization of the SNR; the third step is to design the digital combining matrix at the user end according to the MMSE criterion. While ensuring the spectral efficiency of the system, the algorithm effectively reduces the interference between users under different subcarriers, and the performance of the algorithm is better in the case of low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a hybrid beamforming algorithm and a corresponding implementation device in a millimeter-wave large-scale MIMO-OFDM system. Background technique [0002] Because millimeter wave has abundant spectrum resources and very high transmission rate, millimeter wave communication has become one of the most potential communication technologies. However, millimeter waves are easily absorbed by the air, resulting in very serious path loss, so beamforming technology is needed to improve transmission quality and system capacity. However, the hardware overhead required by the traditional digital beamforming technology is very large, which makes the large-scale antenna system unable to bear the complexity of the digital beamforming technology. In recent years, the hybrid beamforming technology combined with digital beamforming technology and analog beamforming technology has gre...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B7/0452H04B7/0456H04B7/06
CPCH04B7/0452H04B7/0456H04B7/0617H04L27/2628H04L27/265
Inventor 王亚峰张笛笛肖喧娄延年肖宇
Owner BEIJING UNIV OF POSTS & TELECOMM
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