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Displaying 301 - 325 of 1400

Sub-nanosecond Tuning of Microwave Resonators Fabricated on Ruddlesden-Popper Dielectric Thin Films

July 9, 2018
Author(s)
Aaron M. Hagerstrom, Xifeng Lu, Natalie Dawley, H. Nair, Jordi Mateu, Robert D. Horansky, Charles A. Little, James C. Booth, Christian J. Long
Voltage-tunable dielectric materials are widely used for microwave-frequency signal processing. Among tunable dielectric thin films, (SrTiO3)nSrO Ruddlesden-Popper (RP) superlattices have exceptionally low loss at high frequencies. This paper reports the

Impact of Phase Calibration on EVM Measurement Quality

June 14, 2018
Author(s)
Diogo Ribeiro, Dylan Williams, Richard Chamberlin, Nuno B. Carvalho
In this paper, the calibrated measurement of wideband modulated signals by mixer-based large-signal network analyzers (LSNAs) will be evaluated, with a focus on the impact of the phase calibration in the measured error vector magnitude (EVM). The

Measuring Ion-Pairing in Buffer Solutions with Microwave Microfluidics

June 14, 2018
Author(s)
Angela C. Stelson, Charles A. Little, Nathan D. Orloff, Christian J. Long, James C. Booth
Microwave microfluidics is an emergent technique for characterizing conductivity and permittivity of fluids and has wide-ranging applications in the materials science and biomedical fields. The electrical properties of fluids as a function of frequency can

A Framework to Enable Multiple Coexisting Internet of Things Applications

March 1, 2018
Author(s)
Wei Yu, Hanlin Zhang, Yalong Wu, David W. Griffith, Nada T. Golmie
Internet of Things (IoT) uses modern information communication technologies to connect massive numbers of objects and support numerous smart critical infrastructure applications (smart grid, smart cites, etc.). To meet the diverse performance requirements

Increasing Public Safety Broadband Network Resiliency Through Traffic Control

February 1, 2018
Author(s)
Richard A. Rouil, Wesley D. Garey, Camillo A. Gentile, Nada T. Golmie
Long Term Evolution (LTE)-based cellular networks are being deployed around the world to provide public safety with enhanced capabilities and access to broadband technology. In the United States, the First Responder Network Authority (FirstNet) is on the

On the Susceptibility of Coded OFDM to Interference: A Simulation Study

January 3, 2018
Author(s)
Jason Coder, Yao Ma
The susceptibility of broadband wireless communications signals (e.g., LTE, IEEE 802.11) to interference has been a topic of significant research. In this paper, we implement a simulation-based study on the impact interference can have on the bit error

Adaptive synchronization reference selection for out-of-coverage Proximity Services (ProSe)

October 8, 2017
Author(s)
Samantha M. Gamboa Quintiliani, Fernando J. Cintron, David W. Griffith, Richard A. Rouil
Proximity services (ProSe) is a Long Term Evolution Advanced (LTE-A) feature that allows User Equipments (UEs) to communicate without the need of routing the data throughout the network. In this paper, we studied the synchronization protocol used by ProSe

Updated NIST Guidance for Bluetooth Security

July 26, 2017
Author(s)
Lidong Chen, Larry Feldman, Gregory A. Witte
This bulletin summarizes the information in NIST SP 800-121, Revision 2: Guide to Bluetooth Security which provides information on the security capabilities of Bluetooth and provides recommendations to organizations employing Bluetooth wireless

A Novel Adaptive Transmission Algorithm for Device-to-Device Direct Discovery

June 27, 2017
Author(s)
Aziza Ben Mosbah, David W. Griffith, Richard A. Rouil
In this paper we study and improve one service used for Proximity Services and Device-to-Device (D2D) communications: D2D Direct Discovery. As defined in the Third Generation Partnership Project, for both in-coverage and out-of-coverage cases, resource

Implementation and Validation of an LTE D2D Model for ns-3

June 13, 2017
Author(s)
Richard A. Rouil, Fernando J. Cintron, Aziza Ben Mosbah, Samantha M. Gamboa Quintiliani
The ability to perform device-to-device (D2D) communication in Long Term Evolution (LTE)-based cellular networks became possible with the introduction of Proximity Services (ProSe) functionalities in the 3rd Generation Partnership Program (3GPP)

Software Tools for Uncertainty Evaluation in VNA Measurements: A Comparative Study

June 8, 2017
Author(s)
Gustavo Avolio, Dylan Williams, Michael Frey, Sarah B. Streett, Dominique Schreurs, Andrea Ferrero, Michael Dieudonne
We compared three software tools designed for scattering-parameter measurement uncertainty evaluation. These tools propagate uncertainty to calibrated S-parameters by means of a sensitivity analysis. We also validated the sensitivity analysis with Monte
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