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Secrecy degrees of freedom of the 2 interference channel with delayed CSIT
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-7926-5081
2014 (English)In: IEEE Wireless Communications Letters, ISSN 2162-2337, E-ISSN 2162-2345, Vol. 3, no 4, 341-344 p., 6784143Article in journal (Refereed) Published
Abstract [en]

We consider the two-hop interference channel with confidential messages (ICC), where each transmitter sends one confidential message to its intended destination through two trusted relays. We study the secrecy degrees of freedom (SDoF) of the considered 2 ?2 ?2 ICC with delayed channel state information at transmitters (CSIT). We settle the optimal SDoF of the considered network to be (1/2, 1/2). Thus, the considered network has a strictly larger sum SDoF than a two-user one-hop ICC with even full CSIT. Moreover, we study the SDoF of the network with limited Shannon feedback, that only one relay can obtain the delayed CSIT and output feedback from the destinations. The optimal SDoF is also shown to be (1/2, 1/2), revealing that only limited feedback can also bring SDoF gain. Our proposed achievable schemes in both cases are integrated forms of the retrospective interference alignment and artificial noise transmission.

Place, publisher, year, edition, pages
2014. Vol. 3, no 4, 341-344 p., 6784143
Keyword [en]
interference channel, delayed CSIT, Secrecy degrees of freedom
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-161533DOI: 10.1109/LWC.2014.2315795Scopus ID: 2-s2.0-84906707813OAI: oai:DiVA.org:kth-161533DiVA: diva2:794678
Note

QC 20150313

Available from: 2015-03-12 Created: 2015-03-12 Last updated: 2017-12-04Bibliographically approved

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Xiao, MingSkoglund, Mikael

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  • de-DE
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