Asymptotic Analysis of Near-Field Coupling in Massive MISO and Massive SIMO Systems

TL;DR

This paper rigorously analyzes the impact of near-field antenna coupling in massive MISO and SIMO systems, providing conditions under which it can be neglected, which is crucial for practical system design.

Contribution

It offers a rigorous multiport theory-based analysis of near-field coupling effects, clarifying when the common zero-coupling approximation is valid in massive array systems.

Findings

Derived conditions for negligible near-field coupling

Specific analysis for fixed spacing and fixed size arrays

Guidelines for practical system design

Abstract

This paper studies the receiver to transmitter antenna coupling in near-field communications with massive arrays. Although most works in the literature consider that it is negligible and approximate it by zero, there is no rigorous analysis on its relevance for practical systems. In this work, we leverage multiport communication theory to obtain conditions for the aforementioned approximation to be valid in MISO and SIMO systems. These conditions are then particularized for arrays with fixed inter-element spacing and arrays with fixed size.