Reasearch On 5G MIMO OTA Dynamic Channel Test Method

With the rapid development and wide application of Massive MIMIO technology,the performance and quality evaluation of MIMO systems in the dynamic channel environment are increasingly demanding.To ensure the quality of user communication in dynamic scenarios,the "Over the Air(OTA)testing method" is the dominant method for testing terminal performance,and "Multi-probes Anechoic Chamber(MPAC)" is the most widely used solution.However,the current MIMO OTA system performance test is mainly for Wide-Sense Stationary(WSS)channels,considering the complexity and changeability of future channels,it is necessary to conduct in-depth research on the indicators of channel reconstruction and testing methods in dynamic scenarios.This paper studies the channel reconstruction method applicable to 5G MIMO OTA dynamic channel.The main works of this dissertation are as follows:1.In response to the time complexity problem caused by the repeated calculation of probe power weights by the PFS method using convex optimization algorithm,a method of fitting probe power weight based on two-dimensional probe angle is proposed,which is fitted by analyzing the law of discrete probe power weight curves under different probe angles obtained by the convex optimization algorithm.Compared with the traditional convex optimization algorithm to reconstruct the target dynamic channel,the simulation results show that the proposed algorithm can reconstruct the spatial domain characteristics of the two-dimensional dynamic channel model with higher efficiency.2.For the complexity of the channel environment brought by the introduction of the elevation angle channel parameter in the 3D dynamic channel model,a 3D MIMO OTA dynamic channel model reconstruction scheme is proposed,which analyzes the mapping relationship between 3D probe angle and probe power weight by fitting method,and obtains the expression of probe power weight under the joint angle of arrival based on 3D probe angle,which is compared with the traditional convex optimization algorithm for reconstructing the target The simulation results show that the described scheme can reconstruct the 3D dynamic channel environment with very low time complexity,optimize the performance of the 3D MIMO OTA dynamic channel reconstruction scheme,and provide a feasible solution for MIMO OTA dynamic channel testing.