Spatio-Temporal Correlation of Interference in MANET Under Spatially Correlated Shadowing Environment

TL;DR

This paper analyzes how interference correlation in mobile ad-hoc networks is affected by spatially correlated shadowing, providing asymptotic formulas that help model wireless systems more accurately.

Contribution

It introduces a theoretical analysis of interference correlation under spatially correlated shadowing using asymptotic expressions, which are practical for modeling wireless systems.

Findings

Asymptotic expressions accurately approximate correlation coefficients

Correlation distance influences spatial and temporal interference correlation

Models are useful for general wireless system analysis under shadowing

Abstract

Correlation of interference affects spatio-temporal aspects of various wireless mobile systems, such as retransmission, multiple antennas and cooperative relaying. In this paper, we study the spatial and temporal correlation of interference in mobile ad-hoc networks under a correlated shadowing environment. By modeling the node locations as a Poisson point process with an i.i.d. mobility model and considering Gudmundson (1991)' s spatially correlated shadowing model, we theoretically analyze the relationship between the correlation distance of log-normal shadowing and the spatial and temporal correlation coefficients of interference. Since the exact expressions of the correlation coefficients are intractable, we obtain their simple asymptotic expressions as the variance of log-normal shadowing increases. We found in our numerical examples that the asymptotic expansions can be used as tight approximate formulas and useful for modeling general wireless systems under spatially correlated shadowing.