Research And Application Based On Millimeter Wave Wireless Channel Modeling Technology

With the rapid development of wireless communication technologies,the number of network devices and smart terminals continues to grow,resulting in an exponential increase in network traffic.In order to meet the requirements of high-speed,low-delay and other aspects of emerging services such as 3D video and augmented reality,research scholars are committed to the research of 5G key technologies.As one of the 5G key technologies,millimeter wave is favored by industry researchers because of its rich spectrum resources.In order to use the millimeter wave band resources better,it is necessary to study the characteristics of millimeter wave broadband communication and establish a millimeter wave channel model that can provide reference value for establishing millimeter wave cellular networks.Due to the large transmission loss,poor penetration performance,and sensitivity to obstacles,millimeter wave is usually used as an indoor WiFi hotspot or a pico-cellular access network to increase the capacity of the channel.In this paper,the large-scale path model and small-scale parameters of the millimeter-wave channel are obtained through the channel measurement activity in the outdoor micro-cell scene of 39 GHz.The measured path loss results are used to analyze the performance of the millimeter wave dense cellular network.The major contents of this paper are as follows:1.The actual measurement data of millimeter-wave line-of-sight propagation and non-line-of-sight propagation were collected by measuring the channel of the 39 GHz outdoor microcell.The SAGE(Space-Alternating Generalized EM,SAGE)algorithm is used to extract the large-scale parameters and small-scale parameters of the channel from the measured data,and obtain the parametric modeling results of the path loss,delay spread,horizontal angle expansion and vertical angle expansion corresponding to LOS and NLOS propagation environments in measurement scenario.2.Using the measured results of the outdoor millimeter-wave channel,the random geometry tool is used to derive the expression of the coverage probability and the outage probability of the millimeter-wave dense cellular network under the given path loss model,small-scale fading and antenna array mode.The effects of base station density and antenna height difference on the coverage probability and outage probability of millimeter-wave dense cellular networks are obtained through simulation analysis.