Research On Wireless Backhaul Technology For Millimeter Wave Large-Scale Multi-Antenna Heterogeneous Network

Millimeter wave communication and Massive Multiple-Input Multiple-Output(Massive MIMO)technology are the key technologies of the Fifth Generation Mobile Communication(5G)mobile communication system.When using millimeter wave broadband and Massive MIMO zero-forcing beamforming technology,system throughput can be significantly improved.At the same time,the heterogeneous network is an important part of 5G.Multi-cell,low-power wireless backhaul nodes are the keys to improve system capacity and edge user performance.Therefore,the research of resource allocation algorithms based on millimeter-wave large-scale multi-antenna heterogeneous networks wireless backhaul technologies is very meaningful.However,there are many difficulties and challenges in the optimization of wireless backhaul technologies for millimeter wave Massive MIMO heterogeneous networks.On the one hand,how to effectively establish the system channel capacity model under Massive MIMO zero-forcing beamforming technology is the basis for solving the resource optimization problem.On the other hand,the interference problem and the limited problem of wireless backhaul link of heterogeneous networks are key problems which limit the performance of the system.Finally,how to effectively establish a reasonable resource allocation optimization problem and evaluate the performance of the algorithm is an important indicator to verify the effectiveness of the algorithm.In view of the above problems,this paper has carried out research on wireless backhaul technologies for millimeter wave Massive MIMO heterogeneous network.The main work and innovations are as follows:Firstly,this thesis deeply studies and researches on the millimeter-wave large-scale multi-antenna heterogeneous network wireless backhaul transmission related technologies and resource allocation methods,and briefly summarizes key technologies and their characteristics.Secondly,this paper designs a wireless backhaul link mechanism based on the Massive MIMO beamforming technology and the full-duplex technology for wireless backhaul heterogeneous network,and considers the impact of the wireless backhaul link limitation.The optimization algorithm is joint user association and spectrum resource allocation to optimize network performance.In order to view the influence of the frequency and user distribution on the performance of the algorithm,two distribution scenarios,random case and hotspot case,are used in the simulation process.The result shows that whether in which models,the optimization algorithm can allocate spectrum resources more actively,and small-cell base stations play an important role in the system as well as improve the throughput of the whole system.Finally,this paper considers that when the small cell base station is equipped with multi-antenna MIMO and the total power of the whole system is limited,an optimization problem of joint user association and power allocation is designed to maximize the system sum-log rate.Simulations are also performed in two scenarios and frequencies.The results show that under the both of two frequency models and user distribution models,the optimization algorithm always can adapt to the user distribution and adjust the power allocations.Furthermore,the optimization algorithm always maximizes the overall throughput of the system.