Millimeter wave (mmWave) vehicular communication systems will provide anabundance of bandwidth for the exchange of raw sensor data and supportdriver-assisted and safety-related functionalities. Lack of securecommunication links, however, may lead to abuses and attacks that jeopardizethe efficiency of transportation systems and the physical safety of drivers. Inthis paper, we propose two physical layer (PHY) security techniques forvehicular mmWave communication systems. The first technique uses multipleantennas with a single RF chain to transmit information symbols to a targetreceiver and noise-like signals in non-receiver directions. The secondtechnique uses multiple antennas with a few RF chains to transmit informationsymbols to a target receiver and opportunistically inject artificial noise incontrolled directions, thereby reducing interference in vehicular environments.Theoretical and numerical results show that the proposed techniques providehigher secrecy rate when compared to traditional PHY security techniques thatrequire digital or more complex antenna architectures.
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