Research On Mutil-user Beamforming Technology Planar Array Antenna

With the popularization of intelligent terminals,broadband multimedia services for mobile communication terminals continue to increase,resulting in an exponential increase of users and data traffic,which puts higher demands on system capacity and data rate.By using multiple antennas at the transmit-receive end,MIMO technology improves transmission reliability and communication capacity without sacrificing power and bandwidth.Conventional MIMO technology is mostly limited to the horizontal dimension to provide services for users,and does not make full use of the vertical dimension information in 3D channels.The advent of AAS technology promotes MIMO technology to a higher dimension and 3D MIMO technology has emerged as the key technology of 5G communication with the advantage of further improving system capacity and spectrum utilization.Based on the further study of MIMO communication technology,this thesis analyzes the common multi-antenna model and 2D beamforming algorithm and builds a signal model for an array antenna.With the 2D limitation of MMSE algorithm,vertical and horizontal dimensional information is made full use to extend 2D to 3D.Aiming at the problem that the instable beamforming performance,the waveform distortion or even the algorithm invalidation which the noise causes,the 3D BE-MMSE beamforming algorithm is proposed.In this algorithm,the signal correlation matrix is decomposed by the Eigen decomposition method and the fluctuation factor corresponding to small noise eigenvalues is removed to improve the 3D MMSE.The simulation results show that the 3D BE-MMSE algorithm is suitable for 3D MIMO scene beamforming and has a higher and more stable array output SINR and a lower array output MSE.Further more,the multi-user beamforming scheme is summarized for three scenarios under 5G network slices,meanwhile,the vertical and horizontal application scenarios are abstracted.The simulation results show that the 3D BE-MMSE algorithm also has a multi-user beamforming capability.The algorithms and schemes proposed in this thesis provide key technologies such as the joint use of horizontal and vertical dimensional information to jointly control the beam direction and transmit power in 3D MIMO technology,which achieves the purpose of enhancing the reception strength of a specific user signal,reducing the interference between users and increasing the system capacity.In the end,it provides a theoretical reference and basis for 5G communication with theoretical and practical significance.