Automatic Secret Keys From Reciprocal MIMO Wireless Channels: Measurement and Analysis

Information theoretic limits for random key generation in Multiple-Input Multiple-Output (MIMO) wireless systems exhibiting a reciprocal channel response are investigated experimentally with a new three-node MIMO measurement campaign. As background, simple expressions are presented for the number of available key bits, as well as the number of bits that are secure from a close eavesdropper. Two methods for generating secret keys are analyzed in the context of MIMO channels and their mismatch rate and efficiency are derived. A new wideband indoor MIMO measurement campaign in the 2.51- to 2.59-GHz band is presented, whose purpose is to study the number of available key bits in both line-of-sight and non-line-of-sight environments.

Provided by: Institute of Electrical and Electronics Engineers Topic: Mobility Date Added: Aug 2010 Format: PDF

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