Performance Analysis for Covert Communications Under Faster-than-Nyquist Signaling

TL;DR

This paper investigates how faster-than-Nyquist signaling enhances covert communication performance in fading channels, demonstrating increased covert rates and power compared to traditional Nyquist signaling through theoretical analysis and numerical validation.

Contribution

It provides the first analysis of FTN signaling's benefits for covert communications, including proofs of higher covert rates and power limits under specific divergence constraints.

Findings

FTN signaling achieves higher covert rates than Nyquist signaling.

Maximum transmit power is increased with FTN signaling.

Numerical results confirm the theoretical advantages of FTN for covert data transmission.

Abstract

In this letter, we analyze the performance of covert communications under faster-than-Nyquist (FTN) signaling in the Rayleigh block fading channel. Both Bayesian criterion- and Kullback-Leibler (KL) divergence-based covertness constraints are considered. Especially, for KL divergence-based one, we prove that both the maximum transmit power and covert rate under FTN signaling are higher than those under Nyquist signaling. Numerical results coincide with our analysis and validate the advantages of FTN signaling to realize covert data transmission.