| Massive MIMO(Massive Multiple-Input Multiple-Output),as the core technology of 5G mobile communication system,it works through setting up large number of antenna at the base station side for making full use of resources in the spatial domain to transmit dozens of signals on the same frequency band at the same time.Massive MIMO can increase the capacity of the system and improve the transmission stability;it can also greatly reduce the interference between users,and realize multi-user space reuse.Moreover,Massive MIMO can be formed to narrow beam to greatly increase energy efficiency and reduce the power loss of base stations.The millimeter wave technology,as another key technology of 5 G,is the important way to spread the spectrum resources and improve transmission rates.Millimeter wave can easily increase the spectrum bandwidth,at the same time,the strong attenuation in the atmosphere can decrease the interference between different terminals.It complements with the Massive MIMO technology and has a bright application prospect in indoor short-range communication.At present,the researches on channel simulation and modeling which combine with these two kind of techniques can’t meet the people’s demands for the radio wave propagation in the indoor scenes with high frequency and multi-antenna.Therefore,in order to accurately reveal the non-stationary characteristics of the channel,to verify the effectiveness of New York University’s corresponding scene measurement data,and to summarize the rules and performance of the corresponding scene wave propagation,the channel simulation and modeling of the millimeter-wave Massive MIMO in the indoor scene are performed.Based on these researching background and purposes,the main research contents and innovation points are as follows:1.Deeply study the modeling method and theoretical system of wireless channel.Based on the actual environmental requirements as well as the geometry the electromagnetic characteristics of the building,by simplifying and modeling the actual scenes,eventually the single-layer interior office scene model in the New York university is established as well as a Massive MIMO wireless channel simulation platform has been generated.2.Based on the measurement data,the simulations and parameter corrections about single antenna link are performed on the platform,including the reflection coefficient and transmission coefficient.Through the error analysis,the reliability of the platform and the correctness of the simulation parameters are verified,and it build the basement for the further simulation and modeling of the millimeter wave Massive MIMO.3.Built the linear array antenna which the maximum number is 128 and constructed two kinds of links including LOS(Line of Sight)and NLOS(Non line-of-sight),accurately simulate and track all the path of the multi-path signals,extract and analysis the number of multi-path,path loss,delay spread,coherent bandwidth,angle extension and other parameters.4.Proposed a method combining the advantages of deterministic and statistical modeling,the non-stationary characteristics of the Massive MIMO wireless channel in LOS and NLOS links can be revealed,statistically fit the delay spread and angle spread as well as the corresponding mathematical model is established.Further,quantitative analysis are performed to study the cross-correlation of parameters and spatial correlation with the array element spacing,these provides a useful reference for the simulation and modeling of Massive MIMO.In conclusion,this paper focuses on the channel simulation and modeling of the Massive MIMO and millimeter wave band in the indoor scene,makes up for the deficiencies of related researches and provides significant references and examples for designing and optimizing the indoor communication system with high frequency and multi-antenna. |
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