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Practical Correlation-Matrix Approaches for Standardized Testing of Wireless Devices in Reverberation Chambers

Published

Author(s)

Kate Remley, Sara Catteau, Ahmed Hussain, Carnot Nogueira, Mats Kristoffersen, John Kvarnstrand, Brett Horrocks, Jonas Friden, Rob Horansky, Dylan Williams

Abstract

We extend the autocorrelation-based approaches currently used in standards to full correlation matrix-based approaches in order to identify correlation between both spatially adjacent and non-adjacent samples in reverberation-chamber measurements. We employ a scalar metric that allows users to identify the number of effectively uncorrelated samples in new types of stirring sequences. To make these approaches practical and enhance their accuracy, we implement a thresholding technique that retains correlation related to important aspects of chamber configuration such as loading and undermoded conditions. We develop a method to propagate uncertainty in the complex correlation coefficients through to the number of effective samples for a given reverberation-chamber set-up by use of a bootstrap technique that is accurate even for highly skewed distributions of correlation coefficients. We further apply this method in a sensitivity study regarding the choice threshold value. Agreement with existing approaches in determining the number of effectively uncorrelated samples is presented for a measurement example where spatially adjacent samples are utilized. Examples are then illustrated for non-spatially-adjacent correlated samples at microwave and millimeter-wave frequencies.
Citation
IEEE Open Journal of Antennas and Propagation
Volume
4

Keywords

Cellular device, coherence angle, coherence distance, correlation matrix, measurement uncertainty, reverberation chamber, spatial correlation, wireless system

Citation

Remley, K. , Catteau, S. , Hussain, A. , Nogueira, C. , Kristoffersen, M. , Kvarnstrand, J. , Horrocks, B. , Friden, J. , Horansky, R. and Williams, D. (2023), Practical Correlation-Matrix Approaches for Standardized Testing of Wireless Devices in Reverberation Chambers, IEEE Open Journal of Antennas and Propagation, [online], https://doi.org/10.1109/OJAP.2023.3263055, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936080 (Accessed March 1, 2024)
Created March 30, 2023, Updated December 22, 2023