Optimizing Fingerprint-Spectrum-Based Synchronization in Integrated Sensing and Communications

TL;DR

This paper develops and analyzes window functions to enhance synchronization accuracy in passive-sensing mobile networks, addressing challenges caused by asynchronous transceivers and improving CFO and TO estimation performance.

Contribution

It derives a near-optimal window function for synchronization, proposes a practical window selection criterion, and validates the approach through numerical simulations.

Findings

The near-optimal window improves synchronization MSE.

The practical window selection criterion effectively enhances performance.

Numerical simulations confirm the theoretical analysis.

Abstract

Asynchronous radio transceivers often lead to significant range and velocity ambiguity, posing challenges for precise positioning and velocity estimation in passive-sensing perceptive mobile networks (PMNs). To address this issue, carrier frequency offset (CFO) and time offset (TO) synchronization algorithms have been studied in the literature. However, their performance can be significantly affected by the specific choice of the utilized window functions. Hence, we set out to find superior window functions capable of improving the performance of CFO and TO estimation algorithms. We first derive a near-optimal window, and the theoretical synchronization mean square error (MSE) when utilizing this window. However, since this window is not practically achievable, we then develop a practical window selection criterion and test a special window generated by the super-resolution algorithm. Numerical simulation has verified our analysis.