Towards the secrecy capacity of the Gaussian MIMO wire-tap channel: the 2-2-1 channel
IEEE Transactions on Information Theory
Secure transmission with multiple antennas I: the MISOME wiretap channel
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
The Wiretap Channel With Feedback: Encryption Over the Channel
IEEE Transactions on Information Theory
The Secrecy Capacity of the MIMO Wiretap Channel
IEEE Transactions on Information Theory
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A multiple-antenna Gaussian wiretap channel in which the number of antennas at the source is not larger than that at the eavesdropper is considered. Without feedback, the secrecy capacity over such a channel generally converges to a constant at high signal-to-noise ratio (SNR). A half-duplex secure protocol allowing the destination to actively broadcast random keys over insecure channels is proposed. It is shown that using multiple antennas at the destination is instrumental in achieving a secrecy rate that grows linearly with log SNR. The pre-log factor of the secrecy rate, i.e. the secure degree of freedom, is characterized, revealing an interesting interplay between the numbers of antennas at the three communication nodes.