TY - JOUR

T1 - Compressibility Measures for Affinely Singular Random Vectors

AU - Charusaie, Mohammad Amin

AU - Amini, Arash

AU - Rini, Stefano

N1 - Publisher Copyright:
IEEE

PY - 2022

Y1 - 2022

N2 - The notion of compressibility of a random measure is a rather general concept which find applications in many contexts from data compression, to signal quantization, and parameter estimation. While compressibility for discrete and continuous measures is generally well understood, the case of discrete-continuous measures is quite subtle. In this paper, we focus on a class of multi-dimensional random measures that have singularities on affine lower-dimensional subsets. We refer to this class of random variables as affinely singular. Affinely singular random vectors naturally arises when considering linear transformation of component-wise independent discrete-continuous random variables. To measure the compressibility of such distributions, we introduce the new notion of dimensional-rate bias (DRB) which is closely related to the entropy and differential entropy in discrete and continuous cases, respectively. Similar to entropy and differential entropy, DRB is useful in evaluating the mutual information between distributions of the aforementioned type. Besides the DRB, we also evaluate the the RID of these distributions. We further provide an upper-bound for the RID of multi-dimensional random measures that are obtained by Lipschitz functions of component-wise independent discrete-continuous random variables (X). The upper-bound is shown to be achievable when the Lipschitz function is AX, where A satisfies SPARK(Am×n) = m + 1 (e.g., Vandermonde matrices). When considering discrete-domain moving-average processes with non-Gaussian excitation noise, the above results allow us to evaluate the block-average RID and DRB, as well as to determine a relationship between these parameters and other existing compressibility measures.

AB - The notion of compressibility of a random measure is a rather general concept which find applications in many contexts from data compression, to signal quantization, and parameter estimation. While compressibility for discrete and continuous measures is generally well understood, the case of discrete-continuous measures is quite subtle. In this paper, we focus on a class of multi-dimensional random measures that have singularities on affine lower-dimensional subsets. We refer to this class of random variables as affinely singular. Affinely singular random vectors naturally arises when considering linear transformation of component-wise independent discrete-continuous random variables. To measure the compressibility of such distributions, we introduce the new notion of dimensional-rate bias (DRB) which is closely related to the entropy and differential entropy in discrete and continuous cases, respectively. Similar to entropy and differential entropy, DRB is useful in evaluating the mutual information between distributions of the aforementioned type. Besides the DRB, we also evaluate the the RID of these distributions. We further provide an upper-bound for the RID of multi-dimensional random measures that are obtained by Lipschitz functions of component-wise independent discrete-continuous random variables (X). The upper-bound is shown to be achievable when the Lipschitz function is AX, where A satisfies SPARK(Am×n) = m + 1 (e.g., Vandermonde matrices). When considering discrete-domain moving-average processes with non-Gaussian excitation noise, the above results allow us to evaluate the block-average RID and DRB, as well as to determine a relationship between these parameters and other existing compressibility measures.

KW - Discrete-Continuous Random Variables

KW - Distortion

KW - Distortion measurement

KW - Entropy

KW - Information Dimension

KW - Moving-Average Processes

KW - Random variables

KW - Rate-distortion

KW - Rate-Distortion Function

KW - Resource description framework

KW - White noise

UR - http://www.scopus.com/inward/record.url?scp=85130473936&partnerID=8YFLogxK

U2 - 10.1109/TIT.2022.3174623

DO - 10.1109/TIT.2022.3174623

M3 - Article

AN - SCOPUS:85130473936

SN - 0018-9448

SP - 1

JO - IEEE Transactions on Information Theory

JF - IEEE Transactions on Information Theory

ER -