RF Interference in Lens-Based Massive MIMO Systems -- An Application Note

TL;DR

This paper investigates RF interference in lens-based massive MIMO systems, focusing on uplink interference properties under line-of-sight conditions, and provides foundational analysis for multiuser interference in such systems.

Contribution

It introduces a novel analysis of RF interference in lens-based massive MIMO systems, emphasizing the focusing gain and interference approximation under line-of-sight conditions.

Findings

Mainlobe interference can be approximated effectively.

Effective interferer probability is characterized.

Results serve as a foundation for broader interference analysis.

Abstract

We analyze the uplink radio frequency (RF) interference from a multiplicity of single-antenna user equipments transmitting to a cellular base station (BS) within the same time-frequency resource. The BS is assumed to operate with a lens antenna array, which induces additional focusing gain for the incoming signals. Considering line-of-sight propagation conditions, we characterize the multiuser RF interference properties via approximation of the mainlobe interference as well as the effective interferer probability. The results derived in this application note are foundational to more general multiuser interference analysis across different propagation conditions, which we present in a follow up paper.