On SDoF of Multi-Receiver Wiretap Channel With Alternating CSIT
Zohaib Hassan Awan, Abdellatif Zaidi, and Aydin Sezgin

TL;DR
This paper investigates the secure degrees of freedom (SDoF) in a multi-receiver MISO wiretap channel with alternating channel state information at the transmitter (CSIT), revealing that joint encoding across states enhances secure communication rates.
Contribution
It characterizes the SDoF region for various CSIT state combinations and demonstrates the benefits of joint encoding over separate encoding, extending results to broadcast channels.
Findings
Alternating CSIT provides synergistic SDoF gains.
Joint encoding across states outperforms separate encoding.
Results apply to both wiretap and broadcast channels.
Abstract
We study the problem of secure transmission over a Gaussian multi-input single-output (MISO) two receiver channel with an external eavesdropper, under the assumption that the state of the channel which is available to each receiver is conveyed either perfectly () or with delay () to the transmitter. Denoting by , , and the channel state information at the transmitter (CSIT) of user 1, user 2, and eavesdropper, respectively, the overall CSIT can then alternate between eight possible states, i.e., . We denote by the fraction of time during which the state occurs. Under these assumptions, we first consider the Gaussian MISO wiretap channel and characterize the secure degrees of freedom (SDoF). Next, we consider the general multi-receiver setup and characterize the SDoF region of fixed hybrid states…
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