Abstract
To overcome the frequency-selective fading of ultra wide band (UWB) caused by the multi-path propagation in complicated environment of coal mines, an underground wireless communication system of UWB based on multi-band orthogonal frequency division multiplexing (MB-OFDM) for coal mine is presented. Inde-pendent angle impulse response is used to build up revised channel model for underground tunnels based on the traditional S-V model. With the revised channel model, we construct the underground UWB system based on MB-OFDM and give the band division scheme and the correction approach for channel. The model of the system was simulated in the complex environment of coal mine. Simulation results and analysis show that the underground wireless communication system of UWB based on MB-OFDM can effectively with-stand multipath fading and has the advantages of high anti-noise ability, low bit-error rate, and wide cover-age.
Highlights
In key areas of safety monitoring in coal mine such as the tunnel, working face, tunneling surface and minedout area, wireless communication system can overcome the problem of deployment and maintenance for wired information transmission system
Because of Ultra-Wide band (UWB) Wireless Communication with a high transfer rate, low power consumption, anti-interference, it is conducive to resolve the limited issue of radio communication under the complex environment in coal mines [3]
Moe [5] analyzed of the application of UWB in the tunnel, and in theory, and described the feasibility of the UWB system used in the coal mine tunnels
Summary
In key areas of safety monitoring in coal mine such as the tunnel, working face, tunneling surface and minedout area, wireless communication system can overcome the problem of deployment and maintenance for wired information transmission system. It can realize wireless detection of coal mining, tunneling face, gob gas, and reconstruct the environment monitoring system after the disaster quickly. In order to effectively overcome the path loss, multipath delay and different channels power attenuation of mine roadway, it need to model a UWB system that can be a true reflection of propagation characteristics of UWB signal under the multi-path environment. The simulation results show that the system can guarantee the high communication speed and strong anti-jamming capabilities under mine complex environment
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