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Advanced communications

Wireless (RF)

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Displaying 251 - 275 of 1205

A Graph Database Approach to Wireless IIoT Work-cell Performance Evaluation

February 28, 2020

Author(s)

Richard Candell, Mohamed T. Hany, Yongkang Liu, Karl R. Montgomery, Sebti Foufou

The work-cell is an essential industrial environment for testing wireless communication techniques in factory automation processes. A new testbed was recently designed and developed to facilitate such studies in work-cells by replicating various data flows

On Upper Bounds for D2D Group Size

February 27, 2020

Author(s)

David W. Griffith, Aziza Ben Mosbah

In this paper, we examine the Physical Sidelink Discovery Channel (PSDCH) for out-of-coverage (OOC) Device-to-Device (D2D) Long Term Evolution (LTE) networks using direct discovery for User Equipments (UEs) that are half-duplex. We derive upper bounds for

Millimeter-Wave Highly-Multipath Channel Measurements

February 21, 2020

Author(s)

Alec Weiss, Joshua Kast, Rob Jones, Jeanne Quimby, Rodney Leonhardt, Benjamin Jamroz, Peter Vouras, Dylan Williams, Kate Remley

We provide the frequency response of a high multipath propagation channel using a narrow beamwidth synthetic aperture measurement technique from 26.5 - 40 GHz.

Simplified Ray Tracing for the Millimeter Wave Channel: A Performance Evaluation

February 14, 2020

Author(s)

Mattia Lecci, Paolo Testolina, Marco Giordani, Michele Polese, Tanguy Ropitault, Camillo Gentile, Neeraj Varshney, Michele Zorzi

Millimeter-wave (mmWave) communication is one of the cornerstone innovations of fifth- generation (5G) wireless networks, thanks to the massive bandwidth available in these frequency bands. To correctly assess the performance of such systems, however, it

Field-Only Surface Integral Equations: Scattering from a Dielectric Body

February 1, 2020

Author(s)

Qiang Sun, Evert Klaseboer, Alex Yuffa, Derek Y. Chan

An efficient field-only nonsingular surface integral method to solve Maxwell's equations for the components of the electric field on the surface of a dielectric scatterer is introduced. In this method, both the vector wave equation and the divergence-free

Field-Only Surface Integral Equations: Scattering from a Perfect Electric Conductor

February 1, 2020

Author(s)

Qiang Sun, Evert Klaseboer, Alex Yuffa, Derek Y. Chan

A field-only boundary integral formulation of electromagnetics is derived without the use of surface currents that appear in the Stratton--Chu formulation. For scattering by a perfect electrical conductor (PEC), the components of the electric field are

On the Cross-Application of Calibrated Pathloss Models using Area Features: Finding a Way to Determine Similarity Between Areas

February 1, 2020

Author(s)

Jiayi Zhang, Camillo Gentile, Wesley Garey

Pathloss-model calibration is the practice of refining the nominal parameters of a model according to measurement samples collected in a specific area. It is a widely used by mobile providers to reduce prediction error up to tens of dBs depending on the

DARPA Organic Interconnect Characterization

January 27, 2020

Author(s)

Dylan Williams, Richard Chamberlin, Jerome Cheron, Sam Chitwood, Ken Willis, Brad Butler, Farhang Yazdani

We report on a study of interconnects fabricated on organic and silicon interposers used to connect state-of-the art digital, analog and RF chiplets commissioned by the U.S. Defense Advanced Research Projects Agency (DARPA). The interconnects were

Time Stability of Untethered Electronic Switched MIMO Millimeter-Wave Channel Sounders

January 24, 2020

Author(s)

Peter B. Papazian, Ruoyu Sun

Time stability measurement methods applicable to millimeter wave channel sound are presented using standard parameters used for clock stability. Novel methods are developed to measure the stability of channel sound systems used to measure propagation and

Field Compressed Sensing

January 17, 2020

Author(s)

Anthony B. Kos, Fabio C. Da Silva, Jason B. Coder, Craig W. Nelson, Grace E. Antonucci, Archita Hati

Imaging solutions based on wave scattering seek real-time performance, high dynamic range, and spatial accuracy at scales spanning from nanometers to thousands of kilometers. Compressed sensing algorithms use sparsity to reduce sample size during image

Effect of Federal Incumbent Activity on CBRS Commercial Service

December 19, 2019

Author(s)

Michael R. Souryal, Thao Nguyen

Federal Communications Commission rules for the 3.5 GHz Citizens Broadband Radio Service permit commercial systems to share 150 MHz of bandwidth with federal and other incumbents. To protect the federal incumbents, a spectrum coordinator---the Spectrum

Enhancing LAA Co-existence Using MIMO Under Imperfect Sensing

December 13, 2019

Author(s)

Somayeh Mosleh, Yao Ma, Jason B. Coder, Erik Perrins, Lingjia Liu

To meet the ever growing wireless network demands, in terms of subscribers and data throughput, operating long term evolution (LTE) in unlicensed bands, also known as license assisted access (LAA), is introduced as a promising solution. However, the LAA

Analysis of Generalized CCA Errors and Mitigation in LTE-LAA Spectrum Sharing System

December 9, 2019

Author(s)

Yao Ma, Jason B. Coder

Carrier sense multiple access with collision avoidance (CSMA/CA) procedures have been specified for medium access control (MAC) in several incumbent and emerging wireless systems, such as wireless local area network (WLAN) and long-term evolution (LTE)

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