English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the problem of secure transmission over a Gaussian multi-inputsingle-output (MISO) two receiver channel with an external eavesdropper, underthe assumption that the state of the channel which is available to eachreceiver is conveyed either perfectly ($P$) or with delay ($D$) to thetransmitter. Denoting by $S_1$, $S_2$, and $S_3$ the channel state informationat the transmitter (CSIT) of user 1, user 2, and eavesdropper, respectively,the overall CSIT can then alternate between eight possible states, i.e.,$(S_1,S_2,S_3) \in \{P,D\}^3$. We denote by $\lambda_{S_1 S_2 S_3}$ thefraction of time during which the state $S_1S_2S_3$ occurs. Under theseassumptions, we first consider the Gaussian MISO wiretap channel andcharacterize the secure degrees of freedom (SDoF). Next, we consider thegeneral multi-receiver setup and characterize the SDoF region of fixed hybridstates $PPD$, $PDP$, and $DDP$. We then focus our attention on the symmetriccase in which $\lambda_{PDD}=\lambda_{DPD}$. For this case, we establish boundson SDoF region. The analysis reveals that alternating CSIT allows synergisticgains in terms of SDoF; and shows that, by opposition to encoding separatelyover different states, joint encoding across the states enables strictly bettersecure rates. Furthermore, we specialize our results for the two receiverschannel with an external eavesdropper to the two-user broadcast channel. Weshow that, the synergistic gains in terms of SDoF by alternating CSIT is notrestricted to multi-receiver wiretap channels; and, can also be harnessed underbroadcast setting.

On SDoF of Multi-Receiver Wiretap Channel With Alternating CSIT