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You searched on: Author: Chih-Ming Wang

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1. A Significance Test for Reverberation-Chamber Measurement Uncertainty in Total Radiated Power of Wireless Devices
Published: 10/27/2015
Authors: Catherine A Remley, Chih-Ming Wang, Dylan F Williams, Joop Aan Den Toorn, Christopher L Holloway
Abstract: We develop a significance test that determines whether the component of uncertainty due to the finite number of stepped mode-stirring samples or the component due to the lack of spatial uniformity dominates for a particular chamber set-up and stirrin ...

2. Using the Amplitude Variation of a Reverberation Chamber Channel to Predict the Synchronization of a Wireless Digital Communication Test System
Published: 8/16/2015
Authors: Ray R Tanuhardja, Luis Alberto Gonzalez, Chih-Ming Wang, William F Young, Catherine A Remley
Abstract: 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 metri ...

3. Millimeter-Wave Modulated-Signal and Error-Vector-Magnitude Measurement With Uncertainty
Published: 5/1/2015
Authors: Catherine A Remley, Dylan F Williams, Paul D Hale, Chih-Ming Wang, Jeffrey A Jargon, Youngcheol Park
Abstract: 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 ...

4. Proximity-effect test for lossy wireless-device measurements in reverberation chambers
Published: 1/4/2015
Authors: Catherine A Remley, Joop Aan Den Toorn, Christopher L Holloway, John M Ladbury, Chih-Ming Wang
Abstract: 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 ...

5. Parameter Estimation and Uncertainty Evaluation in a Low Rician K-Factor Reverberation-Chamber Environment
Published: 10/15/2014
Authors: Chih-Ming Wang, Catherine A Remley, Ansgar T. Kirk, Ryan J. Pirkl, Christopher L Holloway, Dylan F Williams, Paul D Hale
Abstract: 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 u ...

6. Calibrated Oscilloscope Measurements for System-Level Characterization of Weakly Nonlinear Sources
Published: 4/4/2014
Authors: Catherine A Remley, Dylan F Williams, Paul D Hale, Chih-Ming Wang, Jeffrey A Jargon, Youngcheol Park
Abstract: We present a technique to characterize and correct for linear and weakly nonlinear distortion introduced by the nonideal response of a wideband, high-frequency modulated-signal source. The magnitude and phase relationships between frequency component ...

7. Statistical Sampling of Carbon Nanotube Populations by Thermogravimetric Analysis
Published: 12/25/2013
Authors: Elisabeth Mansfield, Aparna Kar, Chih-Ming Wang, Ann Chiaramonti Chiaramonti Debay
Abstract: Carbon nanotubes are one of the most promising nanomaterials on the market, with applications in electronics devices, sensing, batteries, composites and medical communities. Strict control of the carbon nanotube chemistry and properties is neces ...

8. Baseband Corrections for Precision Millimeter Wave Signal Measurements
Published: 8/12/2013
Authors: Catherine A Remley, Saeed Farsi, Dominique Schreurs, Dylan F Williams, Paul D Hale, Chih-Ming Wang
Abstract: NA

9. A Precision Millimeter-Wave Modulated-Signal Source
Published: 6/6/2013
Authors: Catherine A Remley, Paul D Hale, Dylan F Williams, Chih-Ming Wang
Abstract: 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 ...

10. Assessing the Effect of Mode-Stirring Method on Uncertainty in Reverberation-Chamber Measurements
Published: 1/14/2013
Authors: Catherine A Remley, Ryan J. Pirkl, Chih-Ming Wang, Haider Shah
Abstract: We develop methods for assessing the standard uncertainty arising from various combinations of mode-stirring methods used in reverberation-chamber measurements. By use of a straightforward measurement-based technique, the combination of mode-stirring ...

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