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Topic Area: Wireless

Displaying records 41 to 50 of 65 records.
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41. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=152160

42. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=152159

43. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33042

44. 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

45. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32854

46. 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.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32902

47. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=152104

48. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51311

49. Characterization of a 50 GHz Comb Generator
Topic: Wireless
Published: 2/1/2008
Authors: Howard C. Reader, Dylan F Williams, Paul D Hale, Tracy S. Clement
Abstract: We characterize a 50 GHz comb generator measured on a sampling oscilloscope. With careful control of the input power, input harmonics and comb generator temperature, we find the output spectrum to be stable to 0.1 dB and 0.5 degrees. We correct resul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32685

50. Soft-Decision Metrics for Coded Orthogonal Signaling in Symmetric Alpha-Stable Noise
Topic: Wireless
Published: 1/1/2008
Authors: Michael R Souryal, E G Larsson, B M Peric, B R Vojcic
Abstract: This paper derives new soft decision metrics for coded orthogonal signaling in impulsive noise, more specifically symmetric alpha-stable noise. For the case of a known channel amplitude and known noise dispersion, exact metrics are derived both for C ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51185