Channel Measurement and Characteristics Analysis of XL-MIMO in UMa Scenario for Mid-band
Extremely Large-scale Multiple-Input Multiple-Output(XL-MIMO)is a key potential technology for 6G communication systems,which significantly improves the security,energy efficiency,spatial efficiency,and robustness of the system.The study of XL-MIMO channels is very important for system design and deployment.In addition,to solve the problem of spectrum shortage,the mid-band(7～24 GHz)will be one of the potential application frequency bands for 6G,and the XL-MIMO system may also be applied in this frequency band.As the scale of the antenna array increases,the XL-MIMO channel will appear near-field and spatial non-sta-tionary characteristics,which brings challenges to the XL-MIMO channel modeling.To study the near-field and spatial non-stationary characteristics of the XL-MIMO channel under the mid-band,the XL-MIMO channel under 13 GHz was measured in the Urban Macro-cell(UMa)scenario,and the near-field and spatial non-stationary characteristics were analyzed through multipath parameters.Analysis results show that the near-field spherical wave will cause the multipath angle to shift in the array domain.The spatial non-stationary effect will cause the uneven distribution of multipath power and angle spread in the array domain.Above observations provide some in-sights for 6G XL-MIMO channel modeling.
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