Ray-optical modeling of simulcast radio propagation channels in tunnels
Simulcast radio propagation channel characteristics inside tunnels are considered in this paper. Based on the image theory of ray optics, a simulcast radio propagation channel in a rectangular tunnel is exactly formulated. As only the field components...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/100936 http://hdl.handle.net/10220/6313 |
| Summary: | Simulcast radio propagation channel characteristics
inside tunnels are considered in this paper. Based on the image
theory of ray optics, a simulcast radio propagation channel in a
rectangular tunnel is exactly formulated. As only the field components
of horizontal and vertical polarization are of interest in real
implementation, the exact formulation is approximated to facilitate
the numerical computation. The calculated simulcast radio
propagation channels are comparable fairly to measurements
at 900 MHz and 2.0 GHz. The validated ray-optical modeling
approach is then applied to simulate simulcast radio propagation
channel characteristics at 900 MHz and 2.0 GHz to gain deeper insight
and better understanding of this type of channels in tunnels.
Results show that large fluctuations occur in the capture regions
of the distributed antennas for both 900 MHz and 2.0 GHz. The
fluctuations in the simulcast regions are larger at 2.0 GHz than at
900 MHz. The root-mean-squared (rms) delay spread is greater in
the simulcast regions than in the capture regions of the distributed
antennas. This larger delay spread is mainly due to the delay
introduced by the transmission medium. Large values of the rms
delay spread can be avoided by a careful design of the distance
between the distributed antennas. |
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