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.

CN108494452BInactive Publication Date: 2021-05-04BEIJING UNIV OF POSTS & TELECOMM
4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-05-04
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

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...