Cell Planning for Wireless Communications
Cell Planning for Wireless Communications
Antennas and Propagation for Wireless Communication Systems
Antennas and Propagation for Wireless Communication Systems
Radio coverage calculations of terrestrial wireless networks using an open-source GRASS system
WSEAS TRANSACTIONS on COMMUNICATIONS
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The present paper analyzes radio signal propagation in long tunnels with different cross sectional size and shape at various signal carrier frequencies, transmitter/receiver positions and material properties applying computer simulations. The influences of different parameters were investigated and results were compared to the empirical four-slope path loss model for long tunnels. It was shown that the size of the tunnel cross-sectional area and signal frequency have considerable impact on signal attenuation along the tunnel while the material properties influence is nearly negligible. Tunnel shape and transverse transmitter/and receiver positions can be neglected. The stated findings confirm validity of the four-slope model which takes into account signal frequency, tunnel dimensions and material properties.