Covariance Matrix Recovery from One-Bit Data with Non-Zero Quantization Thresholds : Algorithm and Performance Analysis

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2 Scopus Citations
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Original languageEnglish
Pages (from-to)4060-4076
Journal / PublicationIEEE Transactions on Signal Processing
Volume71
Online published9 Nov 2023
Publication statusPublished - 2023

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Abstract

Covariance matrix recovery is a topic of great significance in the field of one-bit signal processing and has numerous practical applications. Despite its importance, the conventional arcsine law with zero threshold is incapable of recovering the diagonal elements of the covariance matrix. To address this limitation, recent studies have proposed the use of non-zero clipping thresholds. However, the relationship between the estimation error and the sampling threshold is not yet known. In this article, we undertake an analysis of the mean squared error by computing the Fisher information matrix for a given threshold. Our results reveal that the optimal threshold can vary considerably, depending on the variances and correlation coefficients. As a result, it is inappropriate to adopt a constant threshold to encompass parameters that vary widely. To mitigate this issue, we present a recovery scheme that incorporates time-varying thresholds. Our approach differs from existing methods in that it utilizes the exact values of the threshold, rather than its statistical properties, to increase the estimation accuracy. Simulation results, including those of the direction-of-arrival estimation problem, demonstrate the efficacy of the developed scheme, especially in complex scenarios where the covariance elements are widely separated. © 2023 IEEE.

Research Area(s)

  • Covariance matrix estimation, mean squared error analysis, non-zero threshold, one-bit sampling

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