DESIGN OF A TAILORABLE PHYSICAL LAYER SECURITY FRAMEWORK INCLUDING ALTERNATING SPACE-TIME CODING AND GRAY CODE HOPPING
Authors
Cribbs, Michael R.
Subjects
computational security
Gray coding
information-theoretic security
multiple-input multiple-output
physical layer security
space-time coding
Gray coding
information-theoretic security
multiple-input multiple-output
physical layer security
space-time coding
Advisors
Ha, Tri T.
Jenn, David C.
Kragh, Frank E.
Martinsen, Thor
Romero, Ric
Date of Issue
2021-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
A physical layer security framework is developed that may be tailored to a particular wireless communications link. Alternating space-time coding and Gray code hopping techniques are presented that may be implemented individually or concurrently. The first technique may be utilized in any multiple-input multiple-output system with choice of single- or multi-space-time code configurations. Orthogonal, non-orthogonal, and spatially-multiplexed space-time codes are included to achieve a desired diversity-multiplexing balance in addition to demonstrated security benefits. Gray code hopping may be used in any system with common digital modulation schemes to "hop" between alternative binary reflected Gray code mappings of bits to complex-valued modulation symbols. Unlike similar constellation remapping techniques, Gray code hopping provides improved physical layer security against plaintext attacks without sacrificing bit error rate performance. To facilitate these schemes, we present two series of algorithms that systematically build large sets of unique alternative space-time codes and modulation mappings. Decoding methods are discussed to allow for channel equalization and symbol co-phasing when employing an alternating space-time code. Equivalent modulation/demodulation approaches are provided for Gray code hopping. Information-theoretic and computational security analysis, Monte Carlo simulations, and over-the-air testing are completed as confirmation of proposed methods.
Type
Thesis
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Distribution Statement
Approved for public release. Distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.