A Matrix Exponential Generalization of the Laplace Transform of Poisson Shot Noise

TL;DR

This paper introduces a matrix exponential-based generalization of the Laplace transform for Poisson shot noise, enabling new analytical tools for network signal analysis and interference modeling.

Contribution

It develops the matrix Laplace transform as a matrix function extension of the scalar Laplace transform and applies it to characterize Poisson shot noise and SINR distributions in networks.

Findings

Matrix Laplace transform extends scalar Laplace transform to matrix functions.

Allows direct computation of higher order moments of Poisson shot noise.

Enables bounding CCDF and deriving SINR meta-distribution in Poisson networks.

Abstract

We consider a generalization of the Laplace transform of Poisson shot noise defined as an integral transform with respect to a matrix exponential. We denote this as the matrix Laplace transform and establish that it is in general a matrix function extension of the scalar Laplace transform. We show that the matrix Laplace transform of Poisson shot noise admits an expression analogous to that implied by Campbell's theorem. We demonstrate the utility of this generalization of Campbell's theorem in two important applications: the characterization of a Poisson shot noise process and the derivation of the complementary CDF (CCDF) and meta-distribution of signal-to-interference-and-noise (SINR) models in Poisson networks. In the former application, we demonstrate how the higher order moments of Poisson shot noise may be obtained directly from the elements of its matrix Laplace transform. We further show how the CCDF of this object may be bounded using a summation of the first row of its matrix Laplace transform. For the latter application, we show how the CCDF of SINR models with phase-type distributed desired signal power may be obtained via an expectation of the matrix Laplace transform of the interference and noise, analogous to the canonical case of SINR models with Rayleigh fading. Additionally, when the power of the desired signal is exponentially distributed, we establish that the meta-distribution may be obtained in terms of the limit of a sequence expressed in terms of the matrix Laplace transform of a related Poisson shot noise process.