Channel modelling : establishing high-reliability wireless communication in tunnels

• Main Author: Goh, Jun Hui
• Other Authors: Lee Yee Hui
• Format: Final Year Project
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio
• Online Access: http://hdl.handle.net/10356/77275
• Institution: Nanyang Technological University

This study explores the different channel modelling techniques being used to monitor and observe radio-frequency signals in train tunnels. Omnidirectional antennas were installed and moved along in a 1.2km train tunnel stretching from Paya Lebar to Dakota. This was to simulate the transmission and reception of 2.4 GHz radio signals in the train tunnels. Data recording programs were designed in Labview to capture and record the received power strength at the receiver based on its distance from the transmitter. It was recorded that the received power strength of the received signal in tunnels was higher than the theoretical calculations of free space path loss. Wireless Insite software simulations were also planned and conducted to simulate 2.4 GHz radio-frequency measurements using pre-designed AutoCad tunnels. These tunnels were designed in different ranges of shapes and dimensions to observe the variation in the output characteristics of the received signal. They ranged from 5m height x 5m width rectangular tunnels to curved tunnels of different ROCs (radius of curvature). Basic parameters such as received power and path loss were observed. It was noted that the received power strength was stronger in narrower and straighter tunnels. This study also sets up foundations into designing circular tunnels for future channel modelling purposes. As such, more research and experiments are needed to establish more well-rounded models to establish reliable wireless link models in train tunnels