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Topic Area: Wireless

Displaying records 1 to 10 of 88 records.
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1. Distributed Deployment Algorithms for Improved Coverage in a Network of Wireless Mobile Sensors
Topic: Wireless
Published: 2/1/2014
Authors: Kamran Sayrafian, Vladimir V Marbukh, Hamid Mahboubi, Kaveh Moezzi, Amir Aghdam
Abstract: In this paper, sensor deployment strategies are developed for effective coverage in wireless sensor networks. In the proposed algorithms, the sensors find coverage holes within the corresponding Voronoi polygons, and then move in a proper directi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912114

2. Analysis for Dynamic Metrology
Topic: Wireless
Published: 1/30/2014
Authors: Andrew M Dienstfrey, Paul D Hale
Abstract: Diverse measurement contexts require estimates of time varying quantities. Ideally the measurement device responds to signal variations significantly more rapidly than the modulation of the signal itself. If so, then well-developed techniques may b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914865

3. Smart Grid Mesh Network Security Using Dynamic Key Distribution with Merkle Tree 4-Way Handshaking
Topic: Wireless
Published: 10/13/2013
Author: Hamid Gharavi
Abstract: Distributed mesh sensor networks provide cost-effective communications for deployment in various smart grid domains, such as home area networks (HAN), neighborhood area networks (NAN), and substation/plant-generation local area networks. This paper i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914747

4. Correlation Coefficient and Loading Effects for MIMO Antennas in a Reverberation Chamber
Topic: Wireless
Published: 8/13/2013
Authors: Nick Janssen, Catherine A Remley, Christopher L Holloway, William F Young
Abstract: The correlation coefficient is a common metric for assessing the performance of an antenna for a multiple-input, multiple-out wireless device. In this paper, the effect of loading a reverberation chamber on the calculation of the correlation coeffici ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913700

5. Influence on Q-Factor of Proximity and Orientation with Respect to Large-Form-Factor Loads in a Reverberation Chamber
Topic: Wireless
Published: 8/13/2013
Authors: Willem Burger, Christopher L Holloway, Catherine A Remley
Abstract: In this paper, it is shown that the presence of largeform-factor loads in close proximity to an antenna under test can affect the measured Q-factor (if measured improperly) in a reverberation chamber, possibly influencing the results of further calcu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913687

6. Proximity and Antenna Orientation Effects for Large-Form-Factor Devices in a Reverberation Chamber
Topic: Wireless
Published: 8/8/2013
Authors: Willem Burger, Catherine A Remley, Christopher L Holloway, John M Ladbury
Abstract: Recent research has shown that large-form-factor devices can affect radiated power measurements in a reverberation chamber due to absorbtion and physical blocking by lossy material present in the device. In this paper, these effects are explained and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913330

7. On the Delay and Data Rate Performance of Throughput-Efficient Multi-Channel Access Algorithms in Cognitive Radio Networks
Topic: Wireless
Published: 7/8/2013
Authors: Kamran Sayrafian, Luca Zappaterra, Hyeong-Ah Choi, Jari Iinatti
Abstract: Cognitive Radio Networks (CRNs) are designed to increase spectrum utilization by allowing unlicensed secondary users (SUs) to operate over existing wireless channels where primary users (PUs) have license to transmit. An SU searches for channels not ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913813

8. Distributed Coverage Optimization in a Network of Static and Mobile Sensors
Topic: Wireless
Published: 6/17/2013
Authors: Kamran Sayrafian, Hamid Mahboubi, Jalal Habibi, Amir Aghdam
Abstract: This paper proposes efficient schemes to increase sensing coverage in a network composed of both mobile and static sensors. The proposed deployment techniques properly assign a virtual weight to every point in the sensing field, based on the infor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913312

9. A Precision Millimeter-Wave Modulated-Signal Source
Topic: Wireless
Published: 6/6/2013
Authors: Catherine A Remley, Paul D Hale, Dylan F Williams, Chih-Ming Wang
Abstract: We develop and characterize a modulated-signal source for use at millimeter-wave frequencies. Components within the source are phase locked by a 10 GHz reference source to minimize drift and improve synchronization. The complex frequency response of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912855

10. MIMO Capacity in 2-D and 3-D Isotropic Environments
Topic: Wireless
Published: 5/21/2013
Authors: Ryan J. Pirkl, Catherine A Remley
Abstract: We analyze the distribution of MIMO channel capacity for different antennas in 2-D and 3-D statistically isotropic environments. These represent possible test environments that may be generated by multi-probe anechoic and reverberation chambers, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910357



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