| The fifth generation mobile communication(5G)is not just a simple upgrade to the current wireless mobile network,but an important revolution in the field of information and communication technology.5G technology will significantly enhance the wireless mobile network services,security,independence,reliability,the end of the delay.Different from the previous four generations of mobile communication technology,5G will try the new antenna technology,air interface technology,network technology,modulation technology to provide users with extraordinary seamless coverage of the seamless experience.Massive MIMO(MIMO)technology has been deeply researched and developed in order to solve the problem of limited spectrum resources in wireless network transmission process and to solve the sharp contradiction between users' growing demand for network capacity and limited resources.The results show that large-scale MIMO has a great effect in improving system capacity,spectral efficiency and power efficiency.However,the antenna resources are always limited,the study proved that a single cell divided into multiple sectors is extremely effective and simple way to enhance the system capacity.But the inter-sector interference coordination has always been the most important problem affecting multi-sector systems.Based on large-scale MIMO technology,this paper analyzes the methods of large-scale antenna resource allocation,dynamic sectorization and interference coordination between sectors.In three-dimensional large-scale MIMO antenna placement studying,compared the three different three-dimensional antenna placed under the system performance.This paper proposed an 3D-Inteligent sectorization method both on the horizontal and vertical,and this method improved the system's throughput a lot.Besides,this paper proposed an interference cancelation method based on the CoMP-JT to dismiss the sectorization system interference effectively by choosing the seriously interfered marginal users and choosing the base station that caused seriously interference on the marginal users.The main contents of the paper are as follows:1)The performance of the conformal array,tetrahedral conformal array and cylindrical conformal array is analyzed and compared.Based on the analysis of the simulation results,it is concluded that the cylindrical conformal array is the ideal placement method under the same spatial resource constraints,which lays the foundation for the research of the three-dimensional sector division.2)By analyzing the traditional fixed sector partitioning method,an intelligent sector partitioning algorithm based on decision tree clustering algorithm is proposed.The method can intelligently group the users in the cell according to the user location information and solve the sector beam pointing and width of the service group according to the location information of each user group,then to calculate the optimal beamforming matrix so that the majority of the user is in the center of the sector to receive the service.In order to further enhance the system throughput.3)In a multi-cell large-scale MIMO scenario,a single cell is divided by two-dimensional sectors.In engineering practice,the beams interference would generate between the inner sectors and outer sectors and between the adjacent cells.Therefore,this paper proposes a method of inter-sector interference cancellation based on joint transmission(CoMP-JT).By selecting the edge users of every sector with strong interference,then selecting the sector base stations which generates strong interference to the edge users,through the base-station time-frequency resource synchronization,all interference sectors' station send the useful signal to the edge sector users to eliminate the interference signal,and greatly to enhance the edge user's signal to noise ratio,thereby enhancing the edge sectors' spectrum efficiency.It can be seen from the simulation results that the overall spectrum efficiency of the system is improved by about 10%,which verifies the effectiveness of this method. |
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