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<p>Channel-response-based physical-layer authentication systems are challenged by the use of millimeter-wave frequencies for wireless communications due to the reduced coherence time and the sparsity of multipath components typically encountered. We examine how such an environment makes the assumptions of previous works in physical-layer authentication unrealistic, and present an approach that can tolerate such challenges by anticipating channel-response features based on relatively simple environmental survey information and location information of the communicating nodes. In addition to its resilience to millimeter-wave channel phenomena, such an approach has the advantage of being independent of an alternative initial authentication mechanism, distinguishing it from the majority of previous channel-based physical-layer authentication works and enabling its use in multi-factor authentication. Our work examines to what extent multipath time delays caused by planar specular reflectors enable the authentication of a wireless user’s reported position. Our formulations are supported via simulation of multiple environments, and the efficacy of the proposed scheme is supported via analysis of its information entropy and the likelihood that a masquerading attempt will be inadvertently authenticated. The analysis indicates useful information entropy and miss rates can be achieved provided measurement error is adequately bounded.
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<br>Subjects: physical-layer authentication; millimeter-wave channel response; planar estimation; geometry-based channel response; 5G</div>
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Lord, Scott F.</div>
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