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Wireless communication inside mines and tunnels is very different from that in terrestrial environment because of the strong attenuation of signals. Here, the authors are developing an empirical model for the underground wireless communication channel based on experimental data which help in predicting the average received signal strength at a given distance from transmitter. The model aims at adding correction factors to the available outdoor and indoor propagation models such as Okumara-hata model, cost231 model, ITU indoor propagation models, etc.
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