On the performance of an integrated communication and localization system: an analytical framework

TL;DR

This paper develops an analytical framework to quantify the trade-offs between communication capacity and localization accuracy in an integrated system, guiding resource allocation choices in different deployment scenarios.

Contribution

It introduces a closed-form analytical model for capacity and CRB loss trade-offs in ILAC systems with time and frequency resource allocation.

Findings

Frequency-domain allocation is better with fewer antennas and larger UE-gNB distance.

Time-domain allocation is preferable with more antennas and shorter distance.

The analytical model is validated through simulations.

Abstract

Quantifying the performance bound of an integrated localization and communication (ILAC) system and the trade-off between communication and localization performance is critical. In this letter, we consider an ILAC system that can perform communication and localization via time-domain or frequency-domain resource allocation. We develop an analytical framework to derive the closed-form expression of the capacity loss versus localization Cramer-Rao lower bound (CRB) loss via time-domain and frequency-domain resource allocation. Simulation results validate the analytical model and demonstrate that frequency-domain resource allocation is preferable in scenarios with a smaller number of antennas at the next generation nodeB (gNB) and a larger distance between user equipment (UE) and gNB, while time-domain resource allocation is preferable in scenarios with a larger number of antennas and smaller distance between UE and the gNB.