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Keys for symmetric encryption can be established by generating key bits from the mutually-observed randomness present within estimates of a reciprocal wireless channel. We consider this approach for key establishment in multiple-input multiple-output (MIMO) systems and provide a channel estimation strategy that increases the key rate, or the mutual information between the channel estimates at the...
This paper focuses on a recently-developed technique for maximizing the number of encryption key bits that can be established using multi-antenna estimation of the reciprocal multipath electromagnetic propagation channel. The analysis shows that for Ricean channels with a strong line-of-sight component, the performance of the original technique is degraded. A modified approach is then proposed to...
This paper proposes a technique for channel estimation that approximately optimizes the number of secret encryption key bits that can be generated from estimation of the reciprocal electromagnetic propagation in a multipath environment for systems with multiple antennas. Numerical studies demonstrate that the method dramatically improves performance for low signal-to-noise ratio or large antenna arrays.
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