Spatial and Temporal Correlation of Interference in a Narrow Multibeam LEO Satellite Random Access Network

Ilari Angervuori; Abid Afridi; Risto Wichman

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arXiv · 2607.11602

Spatial and Temporal Correlation of Interference in a Narrow Multibeam LEO Satellite Random Access Network

Ilari Angervuori·Abid Afridi·Risto Wichman

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Abstract

Interference is a limiting factor in the emerging dense low Earth orbit (LEO) networks. In the LEO network, the interference is spatially and temporally correlated. At narrow-beam LEO base stations (BSs), spatial interference can vary significantly, and multipath fading introduces temporal variation. While developing novel stochastic geometry analysis in a multibeam scenario, we explore spatio-temporal interference correlation in the LEO uplink. We derive a closed-form expression for the spatio-temporal interference correlation coefficient. As an application of the analysis, we show that the signal-to-interference ratio (SIR) entails significant spatial clustering. In this regard, we demonstrate that an appropriately designed grant-free random access scheme, particularly slotted ALOHA, can mitigate spatial SIR clustering over the beams while preserving average throughput. Furthermore, we propose a novel gamma distribution model for the interference power distribution and a Lomax distribution model for the SIR.

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Ilari Angervuori, Abid Afridi, Risto Wichman. 2026-09-15. Spatial and Temporal Correlation of Interference in a Narrow Multibeam LEO Satellite Random Access Network. https://arxiv.org/abs/2607.11602

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