MIMO multiple access channel with an arbitrarily varying eavesdropper: Secrecy degrees of freedom

Xiang He, Ashish Khisti, Aylin Yener

    Research output: Contribution to journalArticlepeer-review

    45 Scopus citations

    Abstract

    A two-transmitter Gaussian multiple access wiretap channel with multiple antennas at each of the nodes is investigated. The channel matrices of the legitimate users are fixed and revealed to all the terminals, whereas the channel matrices of the eavesdropper are arbitrarily varying and only known to the eavesdropper. The secrecy degrees of freedom (s.d.o.f.) region under a strong secrecy constraint is characterized. A transmission scheme that orthogonalizes the transmit signals of the two users at the intended receiver, and uses a single-user wiretap code for each user, is shown to achieve the s.d.o.f. region. The converse involves establishing an upper bound on a weighted-sum-rate expression. This is accomplished by using induction, where at each step one combines the secrecy and multiple-access constraints associated with an adversary eavesdropping a carefully selected group of sub-channels.

    Original languageEnglish (US)
    Article number6544669
    Pages (from-to)4733-4745
    Number of pages13
    JournalIEEE Transactions on Information Theory
    Volume59
    Issue number8
    DOIs
    StatePublished - 2013

    All Science Journal Classification (ASJC) codes

    • Information Systems
    • Computer Science Applications
    • Library and Information Sciences

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