@COMMENT This file was generated by bib2html.pl <https://sourceforge.net/projects/bib2html/> version 0.94
@COMMENT written by Patrick Riley <http://sourceforge.net/users/patstg/>
@COMMENT This file came from Benjamin E. Henty's publication pages at
@COMMENT http://www.eirp.org/~henty/publications.html
@PHDTHESIS{henty_thesis_2006,
  author = {Benjamin E. Henty},
  title = {Advanced System Design of In-Building Wireless Communication Networks
	Using Ventilation Ducts},
  school = {Carnegie Mellon University},
  year = {2006},
  address = {Pittsburgh, PA, USA},
  month = dec,
  abstract = {This thesis describes techniques to successfully design an IEEE 802.11g
	wireless system that uses ventilation ducts to distribute the signals
	throughout the building. To describe these techniques we present
	a wide array of measurements that have been performed on test duct
	networks, but setup in a laboratory and in buildings. We present
	trials of different duct modifications and antenna excitations we
	have tried, chronicling how to best install wireless local area network
	equipment in ventilation ducts. Using the installation techniques
	we developed, we present measurements of the pathloss through different
	duct networks in two dif ferent buildings in Stavanger and Oslo,
	Norway. Using our measurements we develop a model of propagation
	that predicts power levels inside a building based on only the duct
	locations. A rigorous calculation of propagation through the ducts
	would require detailed modeling of mode scattering at each component
	in the path. Since our goal was to develop reasonable prediction
	tools that do not require burdensome collection of detailed information
	about duct structure, we have chosen to develop an empirical model
	with parameters based on a physical understanding of the system.
	By describing this model and the accuracy of its use, we show that
	the model can be used reliably for designing a ventilation duct wireless
	distribution system. In fact, we present the design and performance
	of a building with a fully functional ventilation duct based IEEE
	802.11g network. Our design covers a three story, 2000 square meter
	building. We fully characterize this design both with signal strength
	measurements and throughput performance measurements. As part of
	these measurements we present a simple technique for estimating the
	throughput present at particular locations in a building. 
	In addition to describing how to design a ventilation duct based wireless
	system, we explore several techniques for improving channel statistics
	and capacity in such a system. We present a novel antenna array that
	can be used to excite two dif ferent, single modes in a common type
	of ventilation duct. We also present some antenna array diversity
	measurements that show diversity can be an ef fective technique for
	improving the performance of IEEE 802.11b communications transmitted
	through a ventilation duct. Further, we consider an extensive array
	of antenna array techniques utilizing time-reversal focusing methods.
	We first demonstrate that time-reversal can be used at microwave
	frequencies, something not known prior to this work. We then show
	that time-reversal focusing and time-reversal nulling techniques
	can be effective in ventilation ducts, though some techniques, antennas
	and duct configurations work better than others. We present the theoretical
	system capacity of some of these antenna and duct configurations.
	Lastly, as evidence that the time-reversal techniques are not just
	smoke and mirrors, we demonstrate both eigenvector diagonalization
	based MIMO and time-reversal based communications through ventilation
	duct channels. These demonstrations use actual frequency shift keying
	and IEEE 802.11g data transmissions to show that the techniques can
	substantively improve ventilation duct communications.},
  day = {11},
  file = {henty_thesis_2006.pdf:me/henty_thesis_2006.pdf:PDF},
  owner = {henty},
  timestamp = {2006.12.28},
  url = {http://www.eirp.org/~henty/refs/henty_thesis_2006.pdf}
}