Research On Massive MIMO Channel Measurement Method In High-Speed Mobile Scene Based On Beam Tracking

The phased array antenna can quickly change the beam direction of the phased array antenna with the help of a phase shifter.It has the advantages of high gain,accurate beam pointing,no beam inertia,and can achieve high-speed moving target tracking.Therefore,it is widely used in the field of mobile communication.In high-speed mobile scenarios,the large-scale array antenna beam wireless channel has a narrow coverage angle and can only cover reflection paths with small angle and delay spread,which will significantly affect the small-scale fading characteristics of the wireless channel.In addition,as the target moves at a high speed,the wireless channel will also show significant dynamics.Therefore,it is of great significance to study the wireless channel measurement technology for high-speed mobile scenarios.The main research contents and innovations of this article are as follows:1)Based on the original wide-beam static scene wireless channel measurement system,this paper proposes a massive multiple input multiple output(Massive Multiple Input Multiple Output,Massive MIMO)wireless channel measurement method based on beam tracking in high-speed mobile scenes,which will phase control Array antenna step tracking algorithm combined with channel measurement system,designed and built a set of phased array-based wireless channel measurement system,compiled a set of phased array antenna-based beam control software,focused on the phased array antenna beam Control software design process,design interface,step tracking algorithm and theoretical feasibility verification.2)Based on the channel fading simulator,the wireless channel measurement method,system response elimination method,timing error elimination method and large-scale feature extraction method are verified.The phased array antenna beam pattern,beam scanning and beam tracking performance were tested in the anechoic chamber.Combined with the continuous channel acquisition system,large-scale fading characteristics such as path loss and shadow fading in the ideal environment in the anechoic chamber were extracted.On this basis,the radio wave propagation measurement in the corridor scene was carried out,and the difference of the channel multipath power delay distribution under different beam widths was compared.The test found that the multipath component of the narrow beam channel is greatly reduced,and the multipath component is concentrated to a position with a smaller time delay,and the frequency selective fading is reduced,and the effect of the originating spatial filtering is realized..3)Based on the measured data,the large-scale propagation model of the Massive MIMO wireless channel in the high-speed mobile scene based on beam tracking is analyzed,and the power delay distribution characteristics of the LOS scene and the NLOS scene are analyzed.The results show that the narrow beam channel in the high-speed mobile scene The multipath component of the LOS scene is greatly reduced,and the multipath component is concentrated to a position with a smaller delay.As the beam width decreases,the path loss factor increases,and the shadow fading decreases,and the signal is more susceptible to obstacles.The above conclusions can provide a theoretical basis for the application and deployment of the Massive MIMO system in high-speed mobile scenarios.