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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Journal ArticleDOI
Robust user scheduling with COST 2100 channel model for massive MIMO networks
TL;DR: This paper proposes a new user selection algorithm based on knowledge of the geometry of the service area and of location of clusters, without having full channel state information (CSI) at the BS, and shows that the correlation in geometry-based stochastic channel models (GSCMs) arises from the common clusters in the area.
Journal ArticleDOI
Improving scalability of wireless network simulation with bounded inaccuracies
TL;DR: This article formulates distance limit derivation and mobility update reduction that introduce bounded inaccuracy to the radio propagation simulation and proposes a novel technique, Lazy Event Scheduling with Corrective Retrospection, that reduces simulation events twenty-five fold without introducing any inaccuracy at all.
Proceedings ArticleDOI
Near-earth RF propagation - Path loss and variation with weather
TL;DR: In this paper, the effects of weather conditions on the propagation of near ground RF signals were investigated at UHF frequencies using antennas set at heights varying between 0.3 m and 1.5 m in rural line of sight environments.
Dissertation
Radio-Frequency Signal Strength Based Localisation in Unstructured Outdoor Environments
TL;DR: Results from experiments using real data obtained in outdoor environments with a prototype RF localisation system as well as results obtained from simulations are presented in this thesis to validate the theoretical findings and the newly developed sensor model.
Journal ArticleDOI
RF Energy Transfer Channel Models for Sustainable IoT
TL;DR: A new channel model for accurately characterizing the harvested dc power at the receiver is proposed and an optimization problem by accounting for the effect of NLOS component to maximize the RF-ET efficiency, which cannot be captured by the Friis formula is formulated.
References
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TL;DR: This chapter discusses the concept of a Random Variable, the meaning of Probability, and the axioms of probability in terms of Markov Chains and Queueing Theory.
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Random variables and stochastic processes
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.