SIMULATION AND ANALYSIS OF MILLIMETER WAVE PROPAGATION CHARACTERISTICS BASED ON RAY TRACING APPROACH

Abstract

Millimeter waves hold strong promise for future wireless communication due to large available bandwidth, which are not occupied yet. Due to the short wavelength and propagation limitation of millimeter waves signals they experiencing severe multipath with large delay spread and fade quickly because of high path loss i.e. large inter-symbol interference and fluctuation of received signal. In addition, the wideband parameter related to propagation characteristics of this wave are not well studied. Therefore, the main aim of the research is to simulate and analysis propagation characteristics of millimetre wave in outdoor market and indoor office. In this research, Intelligent Ray Tracing model used to predict wideband parameters that affect propagation of millimeter wave by considering geometry and time variants objects. In this research, the biggest market place in Africa, Mercato and Haramaya Institute of Technology Building-412 second floor is considered as a case study. The vehicles and human moving with speed of 10 m/s and 1m/s considered in addition to static objects to study millimeter wave propagation under blockage of time variant in outdoor and indoor propagation environments respectively. The properties of time variant and static objects such as thickness, permittivity and conductivity are built into the WinProp package called WallMan. Material properties of the buildings, vehicles and humans significantly affects propagation of signals. We have found out that the propagation is mainly due to direct path as well as single and two-times reflections and diffractions from building wall and indoor materials. The effects of small cell antenna height and moving objects on millimeter wave outdoor access scenario analyzed. The strong received power and large delay spread due to multipath propagation as height of transmitter is decreases predicted. The shadowing by vehicles obstruct and fluctuates signal strength at receiver locations. The effect of human body on propagation of millimeter wave in indoor office simulated. The movement of persons within the office room cause temporal variations of the received power, path loss and delay spread and in NLOS it is result of reflections and diffraction from building materials that cause deterioration of received signals unexpectedly. High variation of power delay profile observed in NLOS. Prediction result of the wideband parameters related to the millimeter wave propagation is important in designing and planning of future wireless communication system.