Performance Analysis for Covert Communications Under Faster-Than-Nyquist Signaling
Yuan Li, Yuchen Zhang, Jianquan Wang, Wanyu Xiang, Sa Xiao, Liang Chang, Wanbin Tang
Abstract
In this letter, we analyze the performance of covert communications under <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">faster-than-Nyquist</i> (FTN) signaling in the Rayleigh block fading channel. Both maximum likelihood criterion- and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Kullback-Leibler</i> (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.