Reliable Wireless Non-Line-of-Sight Digital Communications for Subterranean Environments
Devon Senffner
School of Engineering
Faculty Supervisor: Hamid Mahmoodi
My project is a digital communication system that uses low-frequency radio waves to communicate between two magnetic loop antennas in a cave that have both receive and transmit functionality, sent over a frequency-hopping 10 kHz bandwidth channel with multiple centers varying from 100 to 300 kHz, which uses Gaussian-filtered Frequency Shift Keying for its modulation and multiple digital encoding methods to preserve the signal against the high multipath, and transmits off of ~10 W of signal power drawn from a car battery, which should be effective at passing through smaller obstacles and refracting off of denser walls in order to propagate through a cave, although with a low data rate.