Journal ArticleDOI
Path loss, delay spread, and outage models as functions of antenna height for microcellular system design
TLDR
The results presented in this paper provide insight into the statistical distributions of measured path loss by showing the validity of a double regression model with a break point at a distance that has first Fresnel zone clearance for line-of-sight topographies.Abstract:
This paper presents results of wide-band path loss and delay spread measurements for five representative microcellular environments in the San Francisco Bay area at 1900 MHz. Measurements were made with a wide-band channel sounder using a 100-ns probing pulse. Base station antenna heights of 3.7 m, 8.5 m, and 13.3 m were tested with a mobile receiver antenna height of 1.7 m to emulate a typical microcellular scenario. The results presented in this paper provide insight into the statistical distributions of measured path loss by showing the validity of a double regression model with a break point at a distance that has first Fresnel zone clearance for line-of-sight topographies. The variation of delay spread as a function of path loss is also investigated, and a simple exponential overbound model is developed. The path loss and delay spread models are then applied to communication system design allowing outage probabilities, based on path loss or delay spread, to be estimated for a given microcell size. >read more
Citations
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Proceedings ArticleDOI
Scalable simulation of large-scale wireless networks with bounded inaccuracies
TL;DR: Analysis of the effects of common optimization techniques for large-scale wireless network simulation on the overall network performance and also proposes modifications and novel techniques that introduce only limited inaccuracies or no additional inaccuracy at all are presented.
Proceedings ArticleDOI
A Survey and Analysis of Wireless Fieldbus for Industrial Environments
TL;DR: Fundamental problems of wireless channel, comparison and practical test of resent wireless fieldbus technology in industrial environments, and results show reliability and tight timing requirements are difficult to satisfy by the specific properties of the wireless communications.
Proceedings ArticleDOI
Two-ray models in mmWave communications
TL;DR: The two-ray model has been used for modelling of wireless channels already for decades but since researchers and industry are pushing forward to unlock the millimeter wave bands, this model is revisited and it is shown that the break point distance is indeed a valid modelling parameter and can be determined accurately.
Dissertation
Caractérisation et modélisation spatio-temporelles du canal de propagation radioélectrique dans le contexte MIMO
TL;DR: In this article, a double objectif d'approfondir la connaissance sur les aspects theoriques et physiques de la caracterisation et de la modelisation spatio-temporelles du canal de transmission MIMO, en considerant the dimension spatiale au meme niveau que la dimension temporelle, ainsi que de proposer un simulateur du canal MIMOL realiste base on des resultats de mesures.
Journal ArticleDOI
Optimizing the Coexistence Performance of Secondary-User Networks Under Primary-User Constraints for Dynamic Spectrum Access
Chen Sun,Gabriel Porto Villardi,Zhou Lan,Yohannes D. Alemseged,Ha-Nguyen Tran,Hiroshi Harada +5 more
TL;DR: It is shown that when the SU network employs adaptive transmit power control, the medium value of QoC is doubled using the optimal time slot allocation, resulting in significant improvement in coexistence.
References
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TL;DR: An electromagnetic pulse counter having successively operable, contact-operating armatures that are movable to a rest position, an intermediate position and an active position between the main pole and the secondary pole of a magnetic circuit.
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The Effects of Time Delay Spread on Portable Radio Communications Channels with Digital Modulation
TL;DR: A frequencyselective, slowly fading channel is studied by computer simulation and it is found that both GMSK and QPSK with a raised-cosine Nyquist pulse are suitable for a TDM/TDMA digital portable communications channel.
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.