We consider the MIMO wiretap channel, that is a MIMO broadcast channel where the transmitter sends some confidential information to one user which is a legitimate receiver, while the other user is an eavesdropper. Perfect secrecy is achieved when the transmitter and the legitimate receiver can communicate at some positive rate, while insuring that the eavesdropper gets zero bits of information. In this paper, we compute the perfect secrecy capacity of the multiple antenna MIMO broadcast channel, where the number of antennas is arbitrary for both the transmitter and the two receivers. Our technique involves a careful study of a Sato-like upper bound via the solution of a certain algebraic Riccati equation.
The secrecy capacity of the MIMO wiretap channel
Published 2007 in 2008 IEEE International Symposium on Information Theory
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- Publication year
2007
- Venue
2008 IEEE International Symposium on Information Theory
- Publication date
2007-10-09
- Fields of study
Mathematics, Computer Science
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