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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Dissertation
Self-organisation in LTE networks : an investigation
TL;DR: Three approaches to reducing the effect of inter-cell interference on the throughput of LTE networks are explored by using the X2 link to coordinate the scheduling of radio resources and a more distributed and de-centralised approach is taken.
Dissertation
Influences of wind and rain on radio wave propagation in foliated fixed wireless access at 5.8 GHz
TL;DR: The work reported in this thesis has determined the effects of wind and rain in the deployment of fixed wireless access in foliated channel to ensure optimized links be provided for end users.
Journal ArticleDOI
Coverage Regions Under Multi-Slope Pathloss Propagation
Keith Briggs,Arman Shojaeifard +1 more
TL;DR: A new algorithm is provided which computes arbitrarily accurate boundaries of coverage regions under a very general pathloss model, which requires only that the radio signals decrease monotonically with distance and asymptotically as some power of the distance.
Proceedings ArticleDOI
The impact of a two-path radio environment on bit error rate in UMTS networks
Abdul Halim Ali,John G. Gardiner +1 more
TL;DR: In this paper, the effects of severe intersymbol interference (ISI) on WCDMA-FDD mobile networks of the presence of multiple broadband repeaters in the system were analyzed.
References
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Book
Probability, random variables and stochastic processes
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.
Book
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.
Journal ArticleDOI
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.