Journal ArticleDOI
Space and frequency diversity measurements of the 1.7 GHz indoor radio channel using a four-branch receiver
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TLDR
Results indicate that two- and four-branch diversity can be a very effective way to combat signal fading for portable terminals in an indoor radio environment.Abstract:
The practical space and frequency diversity performance achievable inside a building at 1.75 GHz under fading conditions due to the motion of a portable terminal and due to the movement of people are investigated. Data are collected using a four-branch dual-frequency envelope receiver positioned throughout one floor of a university building of common construction type. The measurement environment is characterized for large-scale path loss and wall transmission loss. Envelope cross correlations are calculated, and performance of diversity is measured for various frequency separations and antenna spacings which would be applicable given the physical size of portable telephones and data terminals. Two-branch space diversity is directly compared to two-branch frequency diversity and to four-branch hybrid diversity based on simultaneous measurements of each using selection combining. The distributions of correlations and diversity gain at different locations are also investigated. Results indicate that two- and four-branch diversity can be a very effective way to combat signal fading for portable terminals in an indoor radio environment. >read more
Citations
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Journal ArticleDOI
Modeling the statistical time and angle of arrival characteristics of an indoor multipath channel
TL;DR: A model is proposed that employs the clustered "double Poisson" time-of-arrival model proposed by Saleh and Valenzuela (1987), and the observed angular distribution is also clustered with uniformly distributed clusters and arrivals within clusters that have a Laplacian distribution.
Journal ArticleDOI
An experimental evaluation of the performance of two-branch space and polarization diversity schemes at 1800 MHz
TL;DR: In this article, the mean signal level and envelope cross-correlation of 1800 MHz base station signals received in two-branch spatial and polarization diversity schemes were determined with the experimental base site located in two urban sites, a residential area, a rural area, and near a motorway.
Proceedings ArticleDOI
Radio Channel Quality in Industrial Wireless Sensor Networks
TL;DR: In this paper, theoretical and actual performance of 2.4 GHz IEEE 802.15.4 radio transceivers on the lab bench and on the factory floor, with particular attention to jamming from 802.11 and multipath fading are explored.
Journal ArticleDOI
Statistical modeling of the indoor radio channel at 10 GHz through propagation measurements .I. Narrow-band measurements and modeling
A.F. Abouraddy,S.M. Elnoubi +1 more
TL;DR: A propagation measurement experiment to reach a statistical model of the indoor radio channel at 10 GHz using directive antennas at both terminals and the Nakagami distribution was found to give an excellent fit with its parameter, m, depending on the separation between transmitter and receiver.
An ATM based protocol for Wireless LANs
John Porter,Andy Hopper +1 more
TL;DR: This paper presents a solution to the problem of connectivity of portables to an ATM wired network in the local area environment by using a compatible ATM approach to provide support for multi-media traffic.
References
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Book
Microwave Mobile Communications
William C. Jakes,Donald C. Cox +1 more
TL;DR: An in-depth and practical guide, Microwave Mobile Communications will provide you with a solid understanding of the microwave propagation techniques essential to the design of effective cellular systems.
Journal ArticleDOI
A Statistical Model for Indoor Multipath Propagation
TL;DR: The results of indoor multipath propagation measurements using 10 ns, 1.5 GHz, radarlike pulses are presented for a medium-size office building, and a simple statistical multipath model of the indoor radio channel appears to be extendable to other buildings.
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 Article
Radio coverage in buildings
J. M Keenan,A. J Motley +1 more
TL;DR: An appropriate model is evolved here for coverage at 864 MHz and 1728 MHz; these being the frequency bands of interest for these services.
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.