Simulation channel modelling and propagation through office building using 5G/B5G wireless communications

• Main Author: Zhang, Yuchen
• Other Authors: Soong Boon Hee
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2022
• Subjects: Engineering::Electrical and electronic engineering::Wireless communication systems
• Online Access: https://hdl.handle.net/10356/160028
• Institution: Nanyang Technological University

With the continuous development of mobile communication technology and the rise of HD video service, mobile cloud computing, the Internet of Things, and other requirements and services, wireless communication is facing more and more challenges. Wireless data traffic demand is growing at a rate of up to 50 percent per year and is expected to grow a thousand-fold over the next decade at 108 percent per year. Improving air interface capacity and allocating new spectrum are urgently needed to meet this need. Under the demand of such exponential growth, 3GPP's frequency band resources have been unable to support the growth of mobile data, and the channel capacity supported by 3GHz has been saturated, so it is not easy to improve the transmission rate. 4G mobile network mainly adopts complex link adaptation technologies, such as OFDM, MIMO, Turbo code, HARQ (Hybrid Automatic Repeat Request), and other technologies to maximize spectrum utilization. The use of small cell networks to further improve efficiency under the harsh environmental conditions. However, this does not compensate for the small bandwidth, which will hinder the continuous improvement of the propagation rate. With limited microwave bandwidth, wireless research is shifting to 5G cellular technology that will use millimeter-wave frequencies to provide mobile devices with the unprecedented spectrum and gigabit per second (Gbps) data rates. 5G has 100,000 times more communication capacity than traditional 4G, thanks to the vast communication bandwidth of millimeter-wave. In recent years, the research and development of RF integrated circuit and low power CMOS technology have accelerated the process of millimeter-wave commercialization. Compared to 4G microwaves, the wavelength of the millimeter-wave is reduced by an order of magnitude. Therefore, the bandwidth of 5G wireless channels is more than ten times larger than that of 20MHz cellular channels in the long-term evolution of 4G. However, due to the short millimeter-wave wavelength, diffraction and material penetration will be significantly reduced. Therefore, it is necessary to analyze the characteristics of line-of-sight propagation, reflection, and scattering. Studies have shown that a 1GHz wide channel of 28GHz or 73GHz can provide data rates of several Gbps. Modeling and simulation of signal channels are necessary for the performance evaluation of wireless communication systems. Based on the previous research, this dissertation briefly summarizes the existing achievements of millimeter-wave. It exploits the theoretical basis of ray tracing method modeling and the method of millimeter-wave channel measurement. Based on the ray-tracing method, the channel propagation of the millimeter-wave in an office building is simulated. The simulation analysis of signal propagation in classical and non-line-of-sight environments is carried out. The results are compared with existing research to prove the applicability and practicability of the ray-tracing method.