Research On Virtual MIMO Measurement Based Rotating Horn Antenna And Application In Channel Modeling

In response to the explosive growth of wireless data services,the Fifth Gen-eration mobile communication system(5G)came into being.Among the key tech-nologies of 5G,millimeter-wave communication technology has become the fo-cus of the communication industry.Besides,indoor scenario is an important sce-nario in channel modeling,and the high penetration loss of millimeter-wave ask us to complete further research for indoor scenario.Multiple Input Multiple Output(MIMO)is the main method for the research on signal spatial characteris-tic.Firstly,considering the channel measurement platform,this paper optimize the original platform and design the MIMO measurement platform for millimeter-wave.Then,limited by the development of semi-conductor hardware,we continue studying the virtual MIMO measurement based on the method of rotating horn antenna.Finally,we apply the virtual MIMO measurement in real channel meas-urement.Specific research points include:(1)Designing millimeter-wave MIMO platform based on the SISO plat-form.As one of the key technologies of 5G,millimeter-wave technology need to be comprehensibly analyzed and researched,especially for channel characteris-tics.However,the existing SISO platform can acquire only the path loss and delay parameters,and the MIMO platform is a must for spatial parameters.With the clock synchronization,both the transmitter and the receiver are equipped with an antenna switch unit(ASU)which has 8 signal interface.And a circle antenna-array is composed of 8 directional antennas which orient 8 different directions and has high gain to compensate the high transmission loss.Therefore,this paper complete the design of millimeter-wave MIMO measurement platform equipped with 8×8 multi-antenna array.(2)Researching the method of virtual MIMO measurement based on rotat-ing the horn antenna.Limited by the development of semi-conductor hardware,the real millimeter-wave MIMO measurement system can't be built and we adapt the method of rotating the horn antenna to simulate the multi-antenna array and accomplish the in-depth study for the scheme of virtual MIMO.Firstly,we plan and complete the confirmatory measurement for the scheme,and analyze whether the power azimuth spectrum(PAS)of wireless channel matches the real measure-ment environment.Then,considering the ambiguity of the rotating step and the azimuth half-power beam width(HPBW)of the directional antenna,it is neces-sary to pay attention to the effects of the size of the virtual array on the precision of the estimated results in the virtual multi-antenna measurement.(3)Applying the virtual MIMO measurement to real indoor channel meas-urement and channel modeling.The ultimate aim of channel measurement is to complete the analysis of channel characteristics.After the research for virtual MIMO measurement above,we apply it to the real indoor office scenario at 28 GHz and extract spatial characteristics of the channel using Space-alternating gen-eralized expectation maximization(SAGE).In summary,this paper focus on the key technology of 5G.We investigate the millimeter-wave channel measurement system and focus on the research for virtual MIMO measurement.Finally,we apply the scheme to channel measure-ment in indoor office scenario and complete the analysis of the channel propaga-tion characteristics.It is hoped that these results will be helpful to the standardi-zation of channel and the research of new technology.