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Search Publications by: Kate Remley (Fed)

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Displaying 76 - 100 of 222

Peer-to-Peer Urban Channel Characteristics for Two Public-Safety Frequency Bands

October 1, 2015
Author(s)
Catherine A. Remley, David W. Matolak, Camillo A. Gentile, Christopher L. Holloway, Qiong Wu, Qian Zhang
We report on ground-based wireless channel characteristics for an urban environment in two public safety bands. Results are based upon measurements taken in Denver in June 2009. The public safety bands we investigated are the 700 MHz and 4.9 GHz bands

Using the Amplitude Variation of a Reverberation Chamber Channel to Predict the Synchronization of a Wireless Digital Communication Test System

August 16, 2015
Author(s)
Ray R. Tanuhardja, Luis A. Gonzalez, Chih-Ming Wang, William F. Young, Kate Remley
This contribution discusses the use of a metric based on the amplitude variation of a channel in the signal bandwidth to predict whether or not a digital wireless communication test system receiver will be able to demodulate a test signal. This metric is

Millimeter-Wave Modulated-Signal and Error-Vector-Magnitude Measurement With Uncertainty

May 1, 2015
Author(s)
Catherine A. Remley, Dylan F. Williams, Paul D. Hale, Chih-Ming Wang, Jeffrey A. Jargon, Youngcheol Park
We provide techniques to generate and characterize precision wideband millimeter-wave modulated signals. We use predistortion to obtain a significant improvement in signal quality and an associated reduction in the error vector magnitude (EVM) of the

A Compact Millimeter-wave Multisine Generator for Calibrating Broadband Vector Receivers

April 30, 2015
Author(s)
Paul D. Hale, Kate Remley, Dylan Williams, Jeffrey Jargon, Chih-Ming Wang
We propose a compact and low cost waveform source that can be used to calibrate the magnitude and phase response of vector receivers over a bandwidth as large as a few gigahertz. The generator consists of a broadband comb generator followed by a filter and

Calibration of Millimeter-wave Channel Sounders for Super-resolution Multipath Component Extraction

April 9, 2015
Author(s)
Peter B. Papazian, Jae-Kark Choi, Jelena Senic, Peter J. Jeavons, Camillo Gentile, Nada T. Golmie, Roy Sun, David R. Novotny, Kate Remley
Millimeter-wave communication systems will rely on highly directional antennas to compensate for the greater pathloss expected in their frequency bands of operation. Electronic beamforming, hence, will form a cornerstone for the technology. For the

Proximity-effect test for lossy wireless-device measurements in reverberation chambers

January 4, 2015
Author(s)
Catherine A. Remley, Joop Aan Den Toorn, Christopher L. Holloway, John M. Ladbury, Chih-Ming Wang
We present a test method for quantifying and reducing systematic errors arising from antenna proximity to lossy objects in over-the-air performance testing of lossy large-form-factor wireless devices. The method determines the extent to which antenna

Parameter Estimation and Uncertainty Evaluation in a Low Rician K-Factor Reverberation-Chamber Environment

October 15, 2014
Author(s)
Chih-Ming Wang, Catherine A. Remley, Ansgar T. Kirk, Ryan J. Pirkl, Christopher L. Holloway, Dylan F. Williams, Paul D. Hale
In this paper we study statistical methods for estimating the Rician K-factor when this parameter is small. A fiducial approach for making statistical inference on the K-factor is discussed. The approach requires a Monte Carlo method to compute the

Radiowave Propagation in Urban Environments with Application to Public-Safety Communications

August 4, 2014
Author(s)
William F. Young, Catherine A. Remley, Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, John M. Ladbury, Colton R. Dunlap
We characterize key elements that pose challenges to public-safety radio communications into and out of large buildings, including the strong attenuation of radio signals caused by losses and scattering in the building materials and structure, and the

Efficient Dithering Technique with Periodic Waveforms for RF Test and Characterization

October 7, 2013
Author(s)
Catherine A. Remley, Saeed Farsi, Bart Nauwelaers, Dominique Schreurs
A dithering technique based on ensemble averaging of waveforms is proposed. In the proposed method, instead of performing several measurements with different dithering additive noise, a single measurement of multiple periods of a sine-dithered periodic

Correlation Coefficient and Loading Effects for MIMO Antennas in a Reverberation Chamber

August 13, 2013
Author(s)
Nick Janssen, Kate Remley, Christopher L. Holloway, William F. Young
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 coefficient is

Characterizing Large-Form-Factor Devices in a Reverberation Chamber

July 15, 2013
Author(s)
Catherine A. Remley, Gerrit S. van de Beek, Christopher L. Holloway, John M. Ladbury
Abstract—With new technologies such as machine-to-machine communications there is a growing need to test large-formfactor devices in reverberation chambers. The performance of the reverberation chamber can be degraded by the physical characteristics of

A Precision Millimeter-Wave Modulated-Signal Source

June 6, 2013
Author(s)
Catherine A. Remley, Paul D. Hale, Dylan F. Williams, Chih-Ming Wang
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 the