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Topic Area: Wireless
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Displaying records 71 to 80 of 93 records.
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71. Radio Propagation Measurements Before, During, and After the Collapse of Three Large Building Structures
Topic: Wireless
Published: 8/7/2008
Authors: Christopher L Holloway, Galen H Koepke, Dennis G. Camell, Catherine A Remley
Abstract: We are investigating various schemes for detecting first responders and civilians with portable radios or cell phones who are trapped in voids in a collapsed or partially collapsed building. The first part of this effort is to understand propagation ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32926

72. Radio Wave Propagation Into Large Building Structures, Part 2: Characterization of Multipath
Topic: Wireless
Published: 4/2/2010
Authors: Catherine A Remley, Galen H Koepke, Christopher L Holloway, Chriss A. Grosvenor, Dennis G. Camell, John M Ladbury, Robert T. Johnk, William F Young
Abstract: We report on measurements that characterize multipath conditions that affect broadband wireless communications in building penetration scenarios. Measurements carried out in various large structures quantify both radio-signal attenuation and frequenc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900151

73. Radio Wave Signal Propagation Into Large Building Structures Part 1: CW Signal Attenuation and Variability
Topic: Wireless
Published: 4/2/2010
Authors: Christopher L Holloway, William F Young, Galen H Koepke, Dennis G. Camell, Catherine A Remley
Abstract: In this paper, we report on our investigation into radio communications problems faced by emergency responders in disaster situations. A fundamental challenge to communications into and out of large buildings is the strong attenuation of radio si ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33178

74. Rapidly-Deployable Mesh Network Testbed
Topic: Wireless
Published: 11/30/2009
Authors: Michael R Souryal, Nader Moayeri, Andreas Wapf
Abstract: This paper describes a wireless mesh network testbed for research in rapid deployment and auto-configuration of mesh nodes. Motivated by the needs of first responders and military personnel arriving to an incident area, we developed and tested an au ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902070

75. Real-Time Deployment of Multihop Relays for Range Extension
Topic: Wireless
Published: 6/11/2007
Authors: Michael R Souryal, Johannes Geissbuehler, Leonard E. Miller, Nader Moayeri
Abstract: When the range of single-hop wireless communication is limited by distance or harsh radio propagation conditions, relays can be used to extend the communication range through multihop relaying. This paper targets the need in certain scenarios for rap ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51163

76. Reference Modulation for Calibrated Measurements of Tag Backscatter
Topic: Wireless
Published: 4/14/2011
Authors: Daniel G. Kuester, David R Novotny, Jeffrey R Guerrieri, Randy Direen, Zoya Popovic
Abstract: We present a model and reference backscatter device for calibrating measurements of 860-960 MHz Ultra-High Fre- quency (UHF) tag backscattering. The model relates transmission to and backscattering from the device with a modulation depth calculab ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907507

77. Representing Bias-Network Baseband Characteristics when Simulating Intermodulation Distortion
Topic: Wireless
Published: 6/15/2009
Authors: Catherine A Remley, C. Michael Olsen, Susan L. Sweeney
Abstract: We demonstrate a method to characterize and represent bias-tees, and other components in the signal path, in an accurate and practical fashion in circuit simulations. The method involves measuring S-parameters of the bias-tee, other surrounding circu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904679

78. Reverberation-Chamber Test Environment for Outdoor Urban Wireless Propagation Studies
Topic: Wireless
Published: 6/21/2010
Authors: Helge Fielitz, Catherine A Remley, Christopher L Holloway, Qian Zhang, Qiong Wu, David W. Matolak
Abstract: We introduce a test environment to replicate the well-known clustering of reflections in power delay profiles from urban wireless propagation environments that exhibit late-time delays and reflections. The test set-up combines discrete reflecti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904179

79. Selective Pixel Interpolation for Spatial Error Concealment
Topic: Wireless
Published: 6/1/2011
Authors: Hamid Gharavi, Yi Ge, Bo Yan, Kairan Sun
Abstract: This paper proposes an effective algorithm for spatial error concealment with accurate edge detection and partitioning interpolation. Firstly, a new method is used for detecting possible edge pixels and their matching pixels around the lost block ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909111

80. Simulation of a MIMO System in a Reverberation Chamber
Topic: Wireless
Published: 8/15/2011
Authors: Helge Fielitz, Catherine A Remley, Christopher L Holloway
Abstract: We present a general method to test MIMO antenna setups and algorithms in a reverberation chamber. Our test set-up enables measurement of data throughput using standard laboratory instruments. Using this test set up, effects of antenna setups and/or ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905956



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