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Advanced communications

Wireless (RF)

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  • Published Date
Displaying 201 - 225 of 1193

Digital Radiometer for Traceable Spectrum Sensing

September 14, 2020
Author(s)
Xifeng Lu, Dazhen Gu, Daniel G. Kuester
This paper describes a metrology instrument designed for detecting noise and interference in digital communications. A quadrature detector downconverts in-phase (I) and quadrature (Q) channels, which are each digitized at high speed. This architecture

Industrial Wireless Deployments in the Navy Shipyard

August 30, 2020
Author(s)
Rick Candell, Karl Montgomery, Yongkang Liu, Mohamed Hany
The National Institute of Standards and Technology (NIST) and the Office of Naval Research (ONR) have partnered to investigate the application of digital manufacturing methods and technologies within the navy shipyard. As a part of the effort, wireless

Over-the-Air Testing of Cellular Large-Form-Factor Internet-of-Things Devices in Reverberation Chambers

August 4, 2020
Author(s)
Catherine A. Remley, Clive Bax, Edwin Mendivil, Michael Foegelle, John Kvarnstrand, Derek Skousen, David S?nchez-Hern?ndez, Miguel Garcia-Fernandez, Lorien Chang, Elvis Yen, Johnny Gutierrez, Justin Harbour
We demonstrate the applicability of the reverberation chamber for over-the-air testing of power- based metrics for cellular-enabled wireless internet-of-things devices. A recent industry- sponsored round robin illustrates agreement between labs to within

Smart Manufacturing Testbed for the Advancement of Wireless Adoption in the Factory

July 10, 2020
Author(s)
Richard Candell, Yongkang Liu, Mohamed T. Hany, Karl R. Montgomery, Sebti Foufou
Wireless communication is a key enabling technology central to the advancement of the goals of the Industry 4.0 smart manufacturing concept. Researchers at the National Institute of Standards and Technology are constructing a testbed to aid in the adoption

Over-The-Air Calibration of a Dual-Beam Dual-Polarized 28-GHz Phased-Array Channel Sounder

July 9, 2020
Author(s)
Sung Yun Jun, Derek Caudill, Jelena Senic, Camillo Gentile, Jack Chuang, Nada T. Golmie
This paper describes an over-the-air calibration procedure for the impulse response of a 28-GHz phased-array antenna channel sounder. The silicon-germanium (SiGe) antenna board is composed from two 8x8 planar arrays; each array can generate a distinct beam

Penetration Loss at 60 GHz for Indoor-to-Indoor and Outdoor-to-Indoor Mobile Scenarios

July 8, 2020
Author(s)
Sung Yun Jun, Derek Caudill, Jack Chuang, Peter B. Papazian, Anuraag Bodi, Camillo Gentile, Jelena Senic, Nada T. Golmie
This paper investigates the penetration loss of an office building in indoor-to-indoor and outdoor-to-indoor mobile scenarios. The measurements were collected using our 60-GHz double- directional switched-antenna channel sounder. During measurement, the

Blind Calibration of Phase Drift in Millimeter-Wave Channel Sounders

June 11, 2020
Author(s)
Jack Chuang, Jelena Senic, Chunmei Liu, Camillo Gentile, Sung Yun Jun, Derek Caudill
Millimeter-wave channel sounders are much more sensitive to phase drift than their microwave counterparts by virtue of shorter wavelength. This matters when coherently phasing (electronic or mechanical) antenna scans collected over seconds, minutes, or

Evaluating Uncertainty of Microwave Calibrations with Regression Residuals

June 6, 2020
Author(s)
Dylan F. Williams, Benjamin F. Jamroz, Jake D. Rezac, Robert D. Jones
We present a sensitivity-analysis and a Monte-Carlo algorithm for evaluating the uncertainty of multivariate microwave calibration models with regression residuals. We then use synthetic data to verify the performance of the algorithms and explore their

Blind Measurement of Receiver System Noise

June 4, 2020
Author(s)
Dan Kuester, Adam Wunderlich, Duncan McGillivray, Dazhen Gu, Audrey Puls
Tightly packaged receive systems pose a challenge for noise measurements. The only available receiver outputs are often user data: link benchmark or diagnostic information that can be scavenged with software. These could include data rate benchmark, self

Frequency Invariant Beampatterns for Wideband Synthetic Aperture Channel Sounders

May 29, 2020
Author(s)
Peter G. Vouras, Jeanne T. Quimby, Benjamin F. Jamroz, Alec J. Weiss, Rodney W. Leonhardt, Dylan F. Williams, Catherine A. Remley
This paper derives two novel frequency invariant beamformers (FIBs) for use with wideband synthetic aperture channel sounders. Results using measured data show that the choice of beam pattern can affect the amount of diffuse multipath energy received

A Unified Analytical Approach to Multi-Cell LBT-Based Spectrum Sharing Systems

May 28, 2020
Author(s)
Yao Ma, Somayeh Mosleh, Jason B. Coder
Future unlicensed spectrum sharing scenarios involve multi-cell, multi-tier access of incumbent and emerging wireless systems, such as wireless local area network (WLAN), new-radio unlicensed (NR-U), and long-term evolution (LTE)with licensed assisted