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Displaying 901 - 925 of 1204

Interference Tests for 900 MHz Frequency-Hopping Public-Safety Wireless Devices

August 15, 2011
Author(s)
Catherine A. Remley, Michael R. Souryal, William F. Young, Daniel G. Kuester, David R. Novotny, Jeffrey R. Guerrieri
We discuss free-field measurement methods designed to quantify interference between wireless devices such as RF identification systems and RF-based emergency beacons used by fire fighters. For public safety applications, standardized testing is important

Simulation of a MIMO System in a Reverberation Chamber

August 15, 2011
Author(s)
Helge Fielitz, Kate Remley, Christopher L. Holloway
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 post

Static and Dynamic Propagation-Channel Impairments in Reverberation Chambers

August 15, 2011
Author(s)
Catherine A. Remley, Sander Floris, Christopher L. Holloway, Scott Prather
We study the separate and combined effects of static and dynamic multipath channels created in a reverberation chamber on bit-error-rate measurements of digitally modulated signals. We demonstrate measurement methods to identify individually both static

Recent Developments in Millimeter and Submillimeter Metrology at NIST

June 30, 2011
Author(s)
Ronald A. Ginley
The millimeter and submillimeter frequency ranges are becoming very important to today’s electronics, security and communication industries. NIST has undertaken a research program to aggressively pursue this area. This paper will cover the millimeter

PDH-locked, frequency-stabilized cavity ring-down spectrometer

June 16, 2011
Author(s)
Joseph T. Hodges, A. Cygan, Piotr Maslowski, Katarzyna E. Bielska, S. Wojtewicz, J. Domyslawska, Hisashi Abe, R.S. Trawinski, R. Ciurylo
We describe a high sensitivity and high spectral resolution laser absorption spectrometer based upon the frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) technique. We used the Pound-Drever-Hall (PDH) method to lock the probe laser to the high

Radio Frequency Measurements to Support Public Safety Wireless Communications in Large Buildings and Structures

June 13, 2011
Author(s)
William F. Young, Catherine A. Remley, Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, John M. Ladbury
The public safety community requires dependable wireless communications in buildings that often disrupt the radio frequency propagation due to the construction material, architectural features, or large physical dimensions. Here we introduce measurements

Throughput and Delay Analysis of Half-Duplex IEEE 802.11 Mesh Networks

June 6, 2011
Author(s)
Camillo A. Gentile
Emerging technologies for mesh networks can provide users with last-mile service to an access point by forwarding data through wireless relays instead of through expensive wireline infrastructure. While an extensive amount of literature on mesh networks

Linear Dispersion Codes for Asynchronous Cooperative MIMO Systems

June 1, 2011
Author(s)
Hamid Gharavi
In this treatise, we propose a novel family of Asynchronous Cooperative Linear Dispersion Codes (ACLDCs), which is capable of maintaining full diversity in cooperative scenarios even at the presence of asynchronous reception. The linear dispersion

Multigate Communication Network For Smart Grid

June 1, 2011
Author(s)
Hamid Gharavi
It is envisioned that one of the most important issues in Smart Grid will be to design a network architecture that is capable of providing secure and reliable two-way communication from meters to other Smart Grid domains. While networking technologies and
Displaying 901 - 925 of 1204
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