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Displaying records 51 to 60 of 98 records.
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51. 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. ...

52. 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, ...

53. Measurement Bandwidth Extension Using Multisine Signals: Propagation of Error
Topic: Wireless
Published: 2/6/2010
Authors: Catherine A Remley, Dominique Schreurs, M. Myslinski, Dylan F Williams
Abstract: We describe a post-processing technique that can extend the effective measurement bandwidth of narrowband vector receivers by phase aligning overlapping measurements. The method requires only knowledge of the desired phases of a periodic, multisine e ...

54. Measurements and Models for the Wireless Channel in a Ground-Based Urban Setting in Two Public Safety Frequency Bands
Series: Technical Note (NIST TN)
Report Number: 1557
Topic: Wireless
Published: 1/20/2011
Authors: William F Young, Catherine A Remley, David W. Matolak, Qian Zhang, Christopher L Holloway, Chriss A. Grosvenor, Camillo A Gentile, Galen H Koepke, Qiong Wu
Abstract: We report on measured peer-to-peer (ground-based) wireless channel characteristics for an urban environment in two public safety frequency bands. Results are based upon measurements taken in Denver in June 2009. The public safety bands we investigate ...

55. Measurements in Harsh RF Propagation Environments to Support Performance Evaluation of Wireless Sensor Networks
Topic: Wireless
Published: 6/5/2009
Authors: Catherine A Remley, Galen H Koepke, Christopher L Holloway, Dennis G. Camell, Chriss A. Grosvenor
Abstract: We describe common performance evaluation methods for wireless devices, including wireless sensors, and how measurements of real-world propagation environments are used to support the evaluation process. We then present representative measurement dat ...

56. Measurements to Support Performance Evaluation of Wireless Communications in Tunnels for Urban Search and Rescue Robots
Topic: Wireless
Published: 9/4/2009
Authors: Catherine A Remley, Galen H Koepke, Dennis G. Camell, George Hough
Abstract: We describe methods for evaluating the performance of the wireless link used for control and telemetry for urban search and recue robots. These methods are based on identification and evaluation of performance metrics that describe impairments to the ...

57. Measurements to Support Public Safety Communications: Attenuation and Variability of 750 MHz Radio Wave Signals in Four Large Building Structures: NIST Technical Note 1552
Series: Technical Note (NIST TN)
Topic: Wireless
Published: 8/7/2009
Authors: William F Young, Catherine A Remley, John M Ladbury, Christopher L Holloway, Chriss A. Grosvenor, Galen H Koepke, Sander Floris, Wouter Numan, Andrea Garuti
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 radio communications into and out of large buildings ...

58. Modeling and Measurement of Nonlinear Distortion in Software-Defined-Radio Receiver Front Ends
Topic: Wireless
Published: 6/4/2010
Authors: Catherine A Remley, Nuno Carvalho, Pedro Cruz
Abstract: We evaluate the nonlinear distortion in a software-defined radio front end consisting of a low-noise amplifier followed by an analog-to-digital converter. We then develop a behavioral model that captures the key elements of the nonlinear distortion. ...

59. NIST Measurements in the 750 MHz Band to Support Emergency Response Radio Communications
Topic: Wireless
Published: 5/7/2010
Authors: Catherine A Remley, Christopher L Holloway, william f. Young
Abstract: The National Institute of Standards and Technology (NIST) has just released the sixth in a series of NIST technical notes (TN) on radio signal penetration of radio signals in large building structures (apartment complex, hotel, office buildings, spor ...

60. 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 ...

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