Hybrid Beamforming Technology For Millimeter Wave Wireless Communication Systems

With the popularity of mobile terminals,digital multimedia services have made great progress,and the demand for data transmission rates of mobile communications has increased substantially.In the foreseeable future,users are guaranteed ubiquitous mobility and connectivity.Under the premise of data communication services,global mobile data communication traffic will reach several times the current communication traffic,and the current wireless personal area network(Wireless Personal Area Networks)(WPANs)and wireless local area networks(WLANs)can provide the number The 100 Mbps peak transmission rate has been difficult to meet the application needs.In response to this problem,researchers at home and abroad have proposed millimeter-wave hybrid beamforming,and the emerging millimeter-wave frequency presents many new challenges for mobile wireless communications.The main challenge is the unavailability of any standard channel model.Researchers have proposed new architectural techniques for the technical understanding of channel behavior,different methods for multiple access and air interfaces.The non-ionizing and thermal properties of millimeter waves for safety issues were also analyzed.In addition,the biosafety of millimeter wave frequencies is also under review.In view of the above problems,beamforming techniques can be divided into digital beamforming and analog beamforming according to different implementations;digital beamforming allows advanced transmission strategies,but also brings higher power consumption and implementation complexity;Analog beamforming is relatively simple to implement,but only supports single stream transmission.By performing joint beamforming in the digital and analog domains,the number of RF links in the hybrid beamforming technology is much smaller than the number of array antennas,thereby reducing the processing capacity of the digital signal and reducing the implementation difficulty when the performance degradation is acceptable.Maintain a balance between performance and complexity.Based on this,this paper makes a comprehensive analysis of millimeter wave wireless communication technology.Through the research and analysis of millimeter-wave beam forming technology based on beam search,the principle of beam search algorithm based on full traversal,effective power and full traversal is analyzed.Based on the research and analysis of related technologies,an improved beam search algorithm based on codebook and an encoding matrix operation method based on Angle of Arrival(AoA)estimation are proposed.The complexity and performance of related algorithms are compared and analyzed by MATLAB.The simulation analysis of the beam search and matrix algorithm based on the sparse channel of Saleh-Valenzuela is carried out.The simulation results show that the improved algorithm can achieve good performance while reducing the number of searches.The encoding algorithm based on MUSIC angle of arrival estimation has better performance and lower complexity.The paper discusses key researches such as antenna array technology,protocol standard,millimeter wave communication channel model,beam search mechanism,hybrid codec matrix solving algorithm,etc.The beamforming technology in wave wireless communication system mainly includes:First,the research of millimeter-wave beam forming technology,such as uniform linear and planar array antenna;the analysis of the MIMO channel of millimeter-wave large-scale array antenna is carried out,and the millimeter-wave channel model is briefly introduced,which mainly includes IEEE protocol channel model,IMT-Advaced channel model and sparse channel model.Channel model;three stages of beam forming stipulated by IEEE protocol:sector scan stage,beam optimization stage and beam tracking stage.Secondly,three kinds of millimeter-wave channel models are analyzed,including IEEE protocol channel model,IMT-Advaced channel model and sparse channel model.Thirdly,full-traversal-based beam search and effective power-based beam search are analyzed,and an improved full-traversal-based beam search is attempted.The spectrum efficiency and BER performance of the three algorithms are compared and analyzed by simulation.