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You searched on: Topic Area: Wireless

Displaying records 71 to 80 of 98 records.
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71. 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. ...

72. Diversity Performance of a Practical Non-Coherent Detect-and-Forward Receiver
Topic: Wireless
Published: 11/30/2008
Authors: Michael R Souryal, Huiqing You
Abstract: We propose a non-coherent receiver for the fixed detect-and-forward relay channel and derive a closed-form tight upper bound on its bit error probability in Rayleigh fading channels. Using this upper bound, we show that the receiver achieves nearly ...

73. Non-Coherent Amplify-and-Forward Generalized Likelihood Ratio Test Receiver
Topic: Wireless
Published: 11/30/2008
Author: Michael R Souryal
Abstract: This paper proposes a simple non-coherent amplify-and-forward receiver for the relay channel and evaluates its diversity performance for Rayleigh fading channels. We use the generalized likelihood ratio test to obtain the decision rule in closed for ...

74. Wireless Communications in Tunnels for Urban Search and Rescue Robots
Topic: Wireless
Published: 8/18/2008
Authors: Catherine A Remley, George Hough, Galen H Koepke, Dennis G. Camell, Robert Johnk, Chriss A. Grosvenor
Abstract: We report on propagation tests carried out in a subterranean tunnel to support improved wireless communications for urban search and rescue robots. We describe single-frequency and ultrawideband channel-characterization tests that we conducted, as we ...

75. 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 ...

76. Attenuation, Coupling, and Variability of Radio Wave Signals Into and Throughout Twelve Large Building Structures
Series: Technical Note (NIST TN)
Report Number: 1545
Topic: Wireless
Published: 8/1/2008
Authors: Christopher L Holloway, William F Young, Galen H Koepke, Catherine A Remley, Dennis G. Camell, Yann Becquet
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 communications into and out of large buildings is the ...

77. Guide to Securing Legacy IEEE 802.11 Wireless Networks
Series: Special Publication (NIST SP)
Report Number: 800-48 Rev 1
Topic: Wireless
Published: 7/25/2008
Authors: Karen Ann Scarfone, Derrick Dicoi, Matt Sexton, Cyrus Tibbs
Abstract: The purpose of this document is to provide guidance to organizations in securing their legacy Institute of Electrical and Electronics Engineers (IEEE) 802.11 wireless local area networks (WLAN) that cannot use IEEE 802.11i. The document provides an ...

78. Editorial: Microwave Measurements Come to the Fore
Topic: Wireless
Published: 6/2/2008
Authors: Catherine A Remley, Charles Wilker
Abstract: - no abstract, this is an editorial.

79. Interference Avoidance in Rapidly Deployed Wireless Ad hoc Incident Area Networks
Topic: Wireless
Published: 4/18/2008
Authors: Mohamed T. Refaei, Nader Moayeri, Michael R Souryal
Abstract: A common strategy for responding to indoor emergency scenarios is to rapidly deploy a group of first responders inside the incident area and an incident command center outside of the incident area. First responders are equipped with radios that allow ...

80. Quantize-and-Forward Relaying with M-ary Phase Shift Keying
Topic: Wireless
Published: 3/31/2008
Authors: Michael R Souryal, Huiqing You
Abstract: Using cooperative transmission, two or more single-antenna users can share their antennas to achieve spatial diversity in a slow fading channel. One relaying protocol that achieves diversity, amplify-and-forward (AF), is striking in its simplicity, b ...

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