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MIMO Multiple Access Channel With an Arbitrarily Varying Eavesdropper: Secrecy Degrees of Freedom

机译:具有任意变化的窃听器的MIMO多路访问信道:保密的自由度

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摘要

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.
机译:研究了在每个节点处具有多个天线的两发射机高斯多址窃听信道。合法用户的信道矩阵是固定的,并显示给所有终端,而窃听者的信道矩阵是任意变化的,只有窃听者才知道。对强保密约束下的保密自由度(s.d.o.f.)区域进行了表征。示出了一种传输方案,该方案使两个用户在预期接收器处的发射信号正交,并为每个用户使用单用户窃听代码,以实现s.d.o.f。区域。相反,涉及建立加权和率表达式的上限。这是通过使用归纳来实现的,在归纳中,在每个步骤中,都将与对手窃听经过精心选择的一组子信道相关联的保密和多路访问限制组合在一起。

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