MODAL ANALYSIS OF INDOOR WAVE PROPAGATION IN CORRIDORS AND TUNNELS
Hany Mahmoud Mohamed ElMaghrabi;
Abstract
Key Words: Wave propagation, Curved waveguide, Imperfect conducting walls, Mode matching method.
Summary:
Modeling wave propagation for indoor wireless communication and tunnels is challenging problem because of the large dimensions compared with the operating wavelength and complex geometry of buildings. However, understanding how electromagnetic waves propagate in indoor environments and tunnels becomes increasingly demand as wireless devices become more involved in daily lifestyle. In this research, a model is presented to simulate wave propagation in indoor environment. The proposed model is based on combination of modal analysis, dyadic Green’s function, mode matching method and generalized scattering matrix. A new approach to simulate the effect of imperfectly conducting walls for short corridor sections is proposed. This approach is based on approximating the fields inside the space of the actual waveguide section by an equivalent waveguide sectionof larger dimensions with PEC (Perfect Electric Conductor) walls. Modal analysis for long straight corridor sections and tunnels is proposed based on constant impedance surface approach. This approach is based on assuming that the boundaries of the tunnel section are constant impedance surfaces as the surface impedance of the wall is almost independent of the angle of the wave incidence onto the wall.
A model is presented to simulate wave propagation in curved rectangular tunnels with imperfectly conducting walls. A new approach to simulate the effect of imperfectly conducting tunnel upper and lower walls is proposed. An analytical approach for the calculation of the signal correlation between the transmitters and receivers elements in tunnels and indoor corridors is proposed. A new approach for determining the best locations of the indoor access points is introduced based on minimum correlation between sources with minimum cross talk.
Finally, the effect of the room dimensions on the frequency response of a propagating wave inside rooms and long corridors is presented. It is found by simulation and measurements that room dimensions affect the propagating waves and degenerated bands can appear. Different scenarios are considered in order to check the accuracy of these models. These scenarios are verified by comparing experimental and numerical simulation results. Good agreement is achieved from these comparisons.
Summary:
Modeling wave propagation for indoor wireless communication and tunnels is challenging problem because of the large dimensions compared with the operating wavelength and complex geometry of buildings. However, understanding how electromagnetic waves propagate in indoor environments and tunnels becomes increasingly demand as wireless devices become more involved in daily lifestyle. In this research, a model is presented to simulate wave propagation in indoor environment. The proposed model is based on combination of modal analysis, dyadic Green’s function, mode matching method and generalized scattering matrix. A new approach to simulate the effect of imperfectly conducting walls for short corridor sections is proposed. This approach is based on approximating the fields inside the space of the actual waveguide section by an equivalent waveguide sectionof larger dimensions with PEC (Perfect Electric Conductor) walls. Modal analysis for long straight corridor sections and tunnels is proposed based on constant impedance surface approach. This approach is based on assuming that the boundaries of the tunnel section are constant impedance surfaces as the surface impedance of the wall is almost independent of the angle of the wave incidence onto the wall.
A model is presented to simulate wave propagation in curved rectangular tunnels with imperfectly conducting walls. A new approach to simulate the effect of imperfectly conducting tunnel upper and lower walls is proposed. An analytical approach for the calculation of the signal correlation between the transmitters and receivers elements in tunnels and indoor corridors is proposed. A new approach for determining the best locations of the indoor access points is introduced based on minimum correlation between sources with minimum cross talk.
Finally, the effect of the room dimensions on the frequency response of a propagating wave inside rooms and long corridors is presented. It is found by simulation and measurements that room dimensions affect the propagating waves and degenerated bands can appear. Different scenarios are considered in order to check the accuracy of these models. These scenarios are verified by comparing experimental and numerical simulation results. Good agreement is achieved from these comparisons.
Other data
| Title | MODAL ANALYSIS OF INDOOR WAVE PROPAGATION IN CORRIDORS AND TUNNELS | Other Titles | تحليل نسقى للموجات المنتشرة فى الممرات داخل المبانى والأنفاق | Authors | Hany Mahmoud Mohamed ElMaghrabi | Issue Date | 2017 |
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