Towards the secrecy capacity of the Gaussian MIMO wire-tap channel: the 2-2-1 channel
IEEE Transactions on Information Theory
Information Theoretic Security
Information Theoretic Security
Guaranteeing Secrecy using Artificial Noise
IEEE Transactions on Wireless Communications
Diversity-Multiplexing Tradeoff for the Multiple-Antenna Wire-tap Channel
IEEE Transactions on Wireless Communications
Secure space-time communication
IEEE Transactions on Information Theory
Multiple-Access Channels With Confidential Messages
IEEE Transactions on Information Theory
Secure Communication Over Fading Channels
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
The Relay–Eavesdropper Channel: Cooperation for Secrecy
IEEE Transactions on Information Theory
On the Secrecy Capacity of Fading Channels
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
Hi-index | 754.84 |
A multiple-antenna Gaussian wiretap channel in which the number of antennas at the source is not greater 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 transfer random keys in the form of known interference 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 number of secure degrees of freedom, is characterized, revealing an interesting interplay between the numbers of antennas at the three communication nodes. The relationship of the achievable secure degrees of freedom to those obtained in the case without feedback is finally discussed.