Journal
2009 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY, VOLS 1- 4
Volume -, Issue -, Pages 2602-+Publisher
IEEE
DOI: 10.1109/ISIT.2009.5205967
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Funding
- Binational Science Foundation (BSF)
- FP7 Network of Excellence in Wireless Communications NEWCOM++
- United States National Science Foundation [CNS-06-25637, CCF-07-28208]
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This paper provides a closed-form expression for the secrecy capacity of the multiple-input multiple-output (MIMO) Gaussian wiretap channel, under a power-covariance constraint. Furthermore, the paper specifies the input covariance matrix required in order to attain the capacity. The proof uses the fundamental relationship between information theory and estimation theory in the Gaussian channel, relating the derivative of the mutual information to the minimum mean-square error (MMSE). The proof provides the missing intuition regarding the existence and construction of an enhanced degraded channel that does not increase the secrecy capacity. The concept of enhancement has been used in a previous proof of the problem. Furthermore, the proof presents methods that can be used in proving other MIMO problems, using this fundamental relationship.
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