Covert Capacity of Non-Coherent Rayleigh-Fading Channels

Mehrdad Tahmasbi (1) , Anne Savard (2, 3) , Matthieu Bloch (1)

1 Georgia Institute of Technology [Atlanta]
2 IMT Lille Douai - Ecole nationale supérieure Mines-Télécom Lille Douai
3 CSAM - IEMN - Circuits Systèmes Applications des Micro-ondes - IEMN

The covert capacity is characterized for a non-coherent fast Rayleigh-fading wireless channel, in which a legitimate user wishes to communicate reliably with a legitimate receiver while escaping detection from a warden. It is shown that the covert capacity is achieved with an amplitude-constrained input distribution that consists of a finite number of mass points including one at zero and numerically tractable bounds are provided. It is also conjectured that distributions with two mass points in fixed locations are optimal.

Mots clés: Encoding; Entropy; Wireless communication; Rayleigh channels; Manganese; Throughput; AWGN channels

Domaines: Réseaux et télécommunications [cs.NI]; Science non linéaire [physics]

Mehrdad Tahmasbi, Anne Savard, Matthieu Bloch. Covert Capacity of Non-Coherent Rayleigh-Fading Channels. IEEE Transactions on Information Theory, 2020, 66 (4), pp.1979-2005. ⟨10.1109/TIT.2019.2956489⟩. ⟨hal-02441829⟩