Journal ArticleDOI
Mechanisms governing UHF propagation on single floors in modern office buildings
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TLDR
The authors explore features of office buildings of modern construction that influence propagation between transmitter and receiver located on the same floor and evaluates the sector average signal.Abstract:
Because of the potential implementation of indoor wireless local area networks (LANs) and personal communication networks (PCNs) it is important to understand propagation of signals in the UHF band inside buildings. The authors explore features of office buildings of modern construction that influence propagation between transmitter and receiver located on the same floor. One feature is the clear space between ceiling and furnishings or floor that results in excess attenuation of the signal. A second feature is reflection and transmission at interior and exterior walls. Diffraction at corners and propagation along the exterior wall are also shown to be a significant means for radiation to reach the receivers. The influences of the first two features are combined into a computer program that evaluates the sector average signal, which is then compared with measurements. >read more
Citations
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Journal ArticleDOI
A survey of various propagation models for mobile communication
TL;DR: An impulse-response characterization for the propagation path is presented, including models for small-scale fading, and it is shown that when two-way communication ports can be defined for a mobile system, it is possible to use reciprocity to focus the energy along the direction of an intended user without any explicit knowledge of the electromagnetic environment in which the system is operating.
Journal ArticleDOI
Site-specific propagation prediction for wireless in-building personal communication system design
TL;DR: Time delay comparison shows that the amplitudes of many significant multipath components are accurately predicted by this model, and the effective building material properties are derived for two dissimilar buildings based upon comparison of measured and predicted power delay profiles.
Journal ArticleDOI
Wireless data communications
Kaveh Pahlavan,Allen H. Levesque +1 more
TL;DR: An overview of the wireless data field is presented, emphasizing three major elements: technologies utilized in existing and currently planned wireless data services, issues related to the performance of these systems, and discernible trends in the continuing development of wireless data systems.
Patent
System and method for design, tracking, measurement, prediction and optimization of data communication networks
TL;DR: In this paper, a system and method for design, tracking, measurement, prediction and optimization of data communications networks includes a site specific model of the physical environment, and performs a wide variety of different calculations for predicting network performance using a combination of prediction modes and measurement data.
Journal ArticleDOI
A new approach to 3-D ray tracing for propagation prediction in cities
G. Liang,Henry L. Bertoni +1 more
TL;DR: In this paper, a vertical plane launch (VPL) technique was proposed to estimate a full 3D site-specific ray trace to predict propagation effects in cities for frequencies in the 300 MHz-3 GHz band.
References
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Book
Radiation and scattering of waves
TL;DR: The Asympotic Evaluation of Integrals (AEEI) as mentioned in this paper is a classic in the field of electromagnetics and acoustics that provides complete coverage of radiation and scattering of waves.
Journal ArticleDOI
A theoretical model of UHF propagation in urban environments
J. Walfisch,Henry L. Bertoni +1 more
TL;DR: In this paper, the authors developed a model in which the rows or blocks of buildings are viewed as diffracting cylinders lying on the earth, and the propagation process reduces to multiple forward diffraction past a series of screens.
Journal ArticleDOI
Characterization of UHF multipath radio channels in factory buildings
TL;DR: In this paper, a wideband multipath measurements at 1300 MHz were made in five factory buildings in Indiana and the average factory path loss was found to be a function of distance to the 2.2 power.
Journal ArticleDOI
UHF fading in factories
TL;DR: The extensive empirical data indicate that path loss is dependent upon local surroundings and is log-normally distributed, temporal fading is Rician, and small-scale signal fluctuations due to receiver motion are primarily Rayleigh, although Rician and log-normal distributions fit some of the data.
Journal ArticleDOI
A comparison of indoor radio propagation characteristics at 910 MHz and 1.75 GHz
TL;DR: The results of temporally and spatially distributed wideband (impulse response) propagation experiments in the 900 MHz and 1.7 GHz radio frequency bands in two different buildings on fixed indoor radio links are reported.