Study Of Millimeter-Wave Massive MIMO Wireless Channel Propagation Characteristics Based On The High-Resolution SAGE Algorithm

The fifth generation mobile communication realizes four technical scenarios: continuous widearea coverage,hotspot high capacity,low latency,high reliability,and low power consumption connectivity,to fully achieve Internet of Everything,Intelligence of Everything.As a key technology of 5G,millimeter-wave massive MIMO technology has attracted domestic and overseas academics,due to its high spatial resolution,large channel capacity,strong anti-interference ability and high energy utilization.Based on the improved SAGE algorithm,measurements and simulations of millimeter-wave massive MIMO channels are conducted in this thesis.The propagation characteristics of wireless channels are also studied,such as receive power,delay spread,angle spread.These results provide a theoretical basis for the design of 5G communication systems.The main research contents and conclusions of this thesis are as follows:(1)In this thesis,the background and significance of massive MIMO channel are introduced.The research status is also summarized,including millimeter-wave bands,channel measurements and channel models.Besides,the principles of several common channel parameter extraction algorithms are clarified briefly.The advantages and disadvantages of the traditional algorithm and the SAGE algorithm are compared and analyzed,and the computer implementation process of the SAGE algorithm is elaborated in detail.(2)To solve the estimation ambiguity of angle of arrival,a geometric optics assisted SAGE algorithm is proposed in this thesis.By using ray tracing reversely,the improved algorithm thoroughly considers the propagation mechanism to modify the angle of arrival.Based on this algorithm,channel parameters of outdoor street SIMO channel are extracted.The results show that the accuracy of angle of arrival and angular spread is significantly improved.(3)Based on the geometry optics assisted SAGE algorithm,massive MIMO channel measurement and parameter extraction in a high-speed railway station are carried out.The results show that this algorithm can accurately track the multipath components of antenna array element,including the propagation path,the propagation mechanism and the scatterer.The MCD algorithm is used to cluster the multipaths and dividing lines between clusters are clear.(4)For the indoor high-speed railway station and outdoor rooftop scene,the propagation characteristics of millimeter-wave massive MIMO channels are studied in the thesis.According to measured and simulated results,the large-scale fading characteristics,small-scale fading characteristics and cluster characteristics are studied.The non-stationary property and spherical wave property are also analyzed,which provide the theoretical basis of massive MIMO channel.