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Author: dylan williams

Displaying records 31 to 40 of 149 records.
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31. Firefighter Radio Communications in Large Public Buildings: Comparing Analog and Digital Modulation
Published: 3/7/2006
Authors: Catherine A Remley, Marc Rutschlin, Dylan F Williams, Robert T. Johnk, Galen H Koepke, Christopher L Holloway, Mike G Worrell, Andy MacFarlane
Abstract: To assess in-building radio coverage, in 2004 the City of Phoenix Fire Department carried out extensive testing of their radio systems. They deployed firefighters in standard configurations in a variety of buildings, and rated on a scale of 1 to 5 th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32184

32. Microwave-Mixer Measurement with a Sampling Oscilloscope
Published: 3/1/2006
Authors: Dylan F Williams, Hassen Khenissi, Fabien Ndagijimana, Catherine A Remley, Joel Dunsmore, Paul D Hale, Jack Wang, Tracy S. Clement
Abstract: We describe a straightforward method of separately characterizing up-conversion and down-conversion in microwave mixers with a sampling oscilloscope. The method mismatch-corrects the results, determines both magnitude and phase, and uses a novel time ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31966

33. Covariance-Based Uncertainty Analysis of the NIST Electro-optic Sampling System
Published: 1/1/2006
Authors: Dylan F Williams, Arkadiusz C. (Arkadiusz) Lewandowski, Tracy S. Clement, C. M. Wang, Paul D Hale, Juanita M. Morgan, Darryl A. Keenan, Andrew Dienstfrey
Abstract: We develop a covariance matrix describing the uncertainty of mismatch-corrected measurements performed on the National Institute of Standards and Technology's electro-optic sampling system. This description offers a general way of describing the unce ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31986

34. Propagation and Detection of Radio Signals Before, During and After the Implosion of a Large Sports Stadium (Veteran's Stadium in Philadelphia)
Series: Technical Note (NIST TN)
Report Number: 1541
Published: 10/1/2005
Authors: Christopher L Holloway, Galen H Koepke, Dennis G Camell, Catherine A Remley, Dylan F Williams, Susan Schima, Seturnino Canales
Abstract: In this report, we investigate radio communications problems faced by emergency responders (firefighters and police) in disaster situation such as collapsed buildings. A fundamental challenge to communications into and out of large buildings is the s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32097

35. Propagation and Detection of Radio Signals Before, During and After the Implosion of a 13 Story Apartment Building
Series: Technical Note (NIST TN)
Report Number: 1540
Published: 5/1/2005
Authors: Christopher L Holloway, Galen H Koepke, Dennis G Camell, Catherine A Remley, Dylan F Williams, Susan Schima, Seturnino Canales, Douglas T. Tamura
Abstract: In this report we investigate communications problems faced by emergency responders (firefighters and police) in disaster situations (i.e., collapsed buildings). A fundamental challenge to communications into large building structures is the strong a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31971

36. Calibrated 200 GHz Waveform Measurement
Published: 4/1/2005
Authors: Dylan F Williams, Paul D Hale, Tracy S. Clement
Abstract: We develop a method for mismatch-correcting temporal waveforms measured with a high-speed electro-optic sampling system. The new calibration characterizes the source in both the time and frequency domains, and accounts for all impedances and multiple ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31686

37. Linearizing Large-Signal Scattering Functions
Published: 4/1/2005
Authors: Jan Verspecht, Dylan F Williams, Dominique Schreurs, Catherine A Remley, Michael McKinley
Abstract: We present an improved smallsignal linearization of large-signal scatteringparameter functions that takes on a convenient form similar to scattering parameters. We develop rules for the evolution of the linearization and large-signal scattering funct ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31672

38. Radio Propagation Measurements During a Building Collapse: Applications for First Responders
Published: 3/3/2005
Authors: Christopher L Holloway, Galen H Koepke, Dennis G Camell, Catherine A Remley, Dylan F Williams
Abstract: The National Institute of Standards and Technology is involved in a research project to improve wireless communications for first responders (firefighters and police) in large structures (i.e., large apartment and office buildings, supermarkets, spor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31909

39. Editorial - How to Have your Manuscript Published in the TRANSACTIONS in Six Months or Less
Published: 3/1/2005
Author: Dylan F Williams
Abstract: THIS EDITORIAL DISCUSSES STRATEGIES FOR PUBLISHING TECHNICAL PAPERS IN THE IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31809

40. Measurement of Weak Signals Using a Communications Receiver System
Published: 3/1/2005
Authors: Marc Rutschlin, Catherine A Remley, Robert T. Johnk, Dylan F Williams, Galen H Koepke
Abstract: We describe the calibration of an inexpensive, reliable system for use in weak-signal detection. The calibration procedure described allows the conversion of signals measured with the communications receiver system-which is based on a standard commun ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31873



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