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Topic Area: Wireless

Displaying records 31 to 40 of 65 records.
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31. Measurements to Support Performance Evaluation of Wireless Communications in Tunnels for Urban Search and Rescue Robots
Topic: Wireless
Published: 9/4/2009
Authors: Catherine A Remley, Galen H Koepke, Dennis G Camell, George Hough
Abstract: We describe methods for evaluating the performance of the wireless link used for control and telemetry for urban search and recue robots. These methods are based on identification and evaluation of performance metrics that describe impairments to the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901365

32. Measurements to Support Public Safety Communications: Attenuation and Variability of 750 MHz Radio Wave Signals in Four Large Building Structures: NIST Technical Note 1552
Series: Technical Note (NIST TN)
Topic: Wireless
Published: 8/7/2009
Authors: William F Young, Catherine A Remley, John M Ladbury, Christopher L Holloway, Chriss A. Grosvenor, Galen H Koepke, Sander Floris, Wouter Numan, Andrea Garuti
Abstract: In this report, we investigate radio communication problems faced by emergency responders (firefighters, police, and emergency medical personnel) in disaster situations. A fundamental challenge to radio communications into and out of large buildings ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903077

33. Practical Applications of Nonlinear Measurements
Topic: Wireless
Published: 6/12/2009
Author: Catherine A Remley
Abstract: We discuss the limitations of vector network analyzers in the measurement of nonlinear devices and circuits, including their inability to measure the relative phase between frequency components and the actual impedance in which a device is embedded. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902249

34. Measurements in Harsh RF Propagation Environments to Support Performance Evaluation of Wireless Sensor Networks
Topic: Wireless
Published: 6/5/2009
Authors: Catherine A Remley, Galen H Koepke, Christopher L Holloway, Dennis G Camell, Chriss A. Grosvenor
Abstract: We describe common performance evaluation methods for wireless devices, including wireless sensors, and how measurements of real-world propagation environments are used to support the evaluation process. We then present representative measurement dat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901417

35. Comparison of QPSK and 64QAM EVM for an OFDM WLAN Signal at 2.4 GHz and 4.9 GHz in a Multipath Environment
Topic: Wireless
Published: 6/1/2009
Authors: Catherine A Remley, Michael McKinley, J. S. Kenney, M. Myslinski, Galen H Koepke, Dennis G Camell, Robert Johnk
Abstract: In this work, we verify experimentally the consistency of EVM across modulation types of orthogonal frequency-division multiplexed (OFDM) signals in two dedicated lab setups. We compared EVMs obtained for different modulation types both in an idealiz ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901362

36. Electromagnetic Measurements for Counterfeit Detection of Radio-Frequency Identification Cards
Topic: Wireless
Published: 5/2/2009
Authors: Henry Romero, Catherine A Remley, Dylan F Williams, Chih-Ming Wang
Abstract: We investigate a technique for counterfeit detection of radio-frequency identification cards based on the electromagnetic characteristics of the cards rather than the digital information that they transmit. We describe a method of measuring the elect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33134

37. The IMS 2009 "Bonus Issue"
Topic: Wireless
Published: 5/1/2009
Author: Catherine A Remley
Abstract: This is an Editorial for a special issue of IEEE Microwave Magazine devoted to the International Microwave Symposium. Kate Remley, the Editor-in-Chief, and two co-editors write about this issue.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901704

38. Editorial for the February, 2009 issue of IEEE Microwave Magazine
Topic: Wireless
Published: 2/2/2009
Author: Catherine A Remley
Abstract: An editorial for the February 2009 issue of IEEE Microwave Magazine by Kate Remey, the Editor in Chief.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33214

39. Radio Frequency and Analog/Mixed-Signal (RF and AMS) Technologies for Wireless Communications
Topic: Wireless
Published: 1/5/2009
Authors: Herbert S Bennett, Margaret Huang, John J. Pekarik
Abstract: The challenges facing the RF and AMS community as represented by the International Technology Roadmap for Semiconductors are summarized in this paper.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900886

40. Low probability of detection underwater acoustic communications using direct-sequence spread-spectrum
Topic: Wireless
Published: 12/1/2008
Authors: Wen-Bin Yang, T.C. Yang
Abstract: Direct-sequence spread-spectrum underwater acoustic communications are analyzed in this paper between communication nodes, at least one of which is moving. At-sea data are analyzed which show that the phase change due to source motion is significant. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=152173