Rank-deficient solutions for optimal signaling over secure MIMO channels
Charalambous, Charalambos D.
PublisherInstitute of Electrical and Electronics Engineers Inc.
SourceIEEE International Symposium on Information Theory - Proceedings
IEEE International Symposium on Information Theory - Proceedings
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Capacity-achieving signaling strategies for the Gaussian wiretap MIMO channel are investigated without the degradedness assumption. In addition to known solutions, a number of new rank-deficient solutions for the optimal transmit covariance matrix are obtained. The case of weak eavesdropper is considered in details and the optimal covariance is established in an explicit, closed-form with no extra assumptions. © 2014 IEEE.