2 research outputs found
Achievable secrecy rates over MIMOME Gaussian channels with GMM signals in low-noise regime
We consider a wiretap multiple-input multiple-output multiple-eavesdropper
(MIMOME) channel, where agent Alice aims at transmitting a secret message to
agent Bob, while leaking no information on it to an eavesdropper agent Eve. We
assume that Alice has more antennas than both Bob and Eve, and that she has
only statistical knowledge of the channel towards Eve. We focus on the
low-noise regime, and assess the secrecy rates that are achievable when the
secret message determines the distribution of a multivariate Gaussian mixture
model (GMM) from which a realization is generated and transmitted over the
channel. In particular, we show that if Eve has fewer antennas than Bob, secret
transmission is always possible at low-noise. Moreover, we show that in the
low-noise limit the secrecy capacity of our scheme coincides with its
unconstrained capacity, by providing a class of covariance matrices that allow
to attain such limit without the need of wiretap coding.Comment: 5 pages, 3 figures, to be presented at Global Wireless Summit 201