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Displaying records 11 to 20 of 88 records.
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11. Analysis of Radio-Propagation Environments to Support Standards Development for RF-Based Electronic Safety Equipment
Series: Technical Note (NIST TN)
Report Number: 1559
Topic: Wireless
Published: 3/5/2012
Authors: Catherine A Remley, William F Young, Jacob L. Healy
Abstract: We analyze data from NIST field tests in which radio-propagation channel characteristics were measured at approximately the same physical locations where the performance of various RF-based firefighter distress beacons was tested. These side-by-side ...

12. Ant-Colony Based Near-ML Block Decoder in Asynchronous Cooperative MIMO Systems Using a Linear Dispersion Structure
Topic: Wireless
Published: 6/5/2011
Authors: Hamid Gharavi, Chong Xu
Abstract: The linear dispersion structure is employed to accommodate the dynamic topology of cooperative networks, as well as to achieve higher throughput than conventional space-time codes based on orthogonal designs. Asynchronous Cooperative Liner Dispersio ...

13. Assessment of Performance Metrics for Use of Wireless Sensor Networks in Buildings
Topic: Wireless
Published: 9/30/2009
Authors: Won Suk Jang, William M Healy
Abstract: This paper is part of an effort to develop measurement systems and methods to better predict the performance of wireless sensor and control networks in building applications. Because of the variability in application requirements, the development of ...

14. 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 ...

15. Battery Discharge Characteristics of Wireless Sensors in Building Applications
Topic: Wireless
Published: 4/11/2012
Authors: Wenqi Guo, William M Healy, Mengchu Zhou
Abstract: Sensor nodes in wireless networks often use batteries as their source of energy, but replacing or recharging exhausted batteries in a deployed network can be difficult and costly. Therefore, prolonging battery life becomes a principal objective ...

16. Biometrics in a Networked World
Topic: Wireless
Published: 12/2/2012
Author: Kevin C Mangold

17. Bit Error Rate Measurements in Reverberation Chambers using a VSA
Topic: Wireless
Published: 6/21/2010
Authors: Catherine A Remley, Sander Floris, Christopher L Holloway
Abstract: We discuss practical measurement implementation issues regarding the use of a vector signal analyzer for making bit-error-rate measurements in reverberation chambers. These issues include synchronizing the transmitted and received signals in spite of ...

18. Channel-Adaptive Relaying in Mobile Ad Hoc Networks with Fading
Topic: Wireless
Published: 10/1/2005
Authors: Michael R Souryal, Nader Moayeri
Abstract: This paper describes an approach for relaying in multihop networks that adapts to the time-varying channel and exploits spatial diversity to mitigate multipath fading. Ignored in some simulation-based performance analyses, fading arises from multipa ...

19. 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 ...

20. 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 ...

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