Indoor Radio Propagation Measurements in Different Environments Using Two Types of Transmitting Antenna
The tremendous growth in Wireless Communications System has greatly increased the need to improve the accuracy of predicting signal propagation. It is important to have a tool that can be used to predict the signal coverage area, a method to determine the path loss in microcells, the attenuation...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1997
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10090/1/FK_1997_17_A.pdf |
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| Summary: | The tremendous growth in Wireless Communications System has greatly
increased the need to improve the accuracy of predicting signal propagation. It is
important to have a tool that can be used to predict the signal coverage area, a
method to determine the path loss in microcells, the attenuation due to different
partitions and the effect of the environments.
To understand radio propagation characteristics in buildings for Personal
Communication Systems (PCSs), a comprehensive measurement was carried out in a
shopping and business complex, The Mall, in Kuala Lumpur. Two types of Base
Station (BS) antennas, Omni-directional and Panel antenna, were mounted on the
ceiling and wall respectively. The Mobile Station (MS) uses an antenna with 3dB
gain, height 0.5 m and 1.2 m respectively, at 935 MHz carrier frequency. Many test
settings were chosen in the office, on the floor sharing with the atrium, lower ground
floor and car park, with Line-of-Sight (LOS) and without LOS. The results show some variations of signal strengths with distance that have distinct near and far field
regions.
The buildings where the measurements were carried out typically have walls
and columns constructed from concrete blocks. Within the building the time spread
of arriving radio signals depends on reflections and scattering from the structure of
the buildings. The results of these measurements are presented and discussed in
order to investigate penetration losses in walls, soft boards and floors.
The results showed that shadowing due to the objects has a greater influence
on the signal strength than the distance between the transmitting and receiving
antenna. The path loss within a building is linearly dependent on the logarithm of the
distance, on the number of obstacles blocking the signal, on the number of walls
between transmitter and receiver antenna, and on the number of floors vertically
between the transmitter and receiver antennas. Another important factor is the type
of the environment it is operating in, which is given as the factor n. Comparisons
between predicted and measured results have shown that the model is capable of
predicting the attenuation within the building for different environment. |
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