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Millimeter-wave (mmWave) communications are highly promising to improve thecapacity of modern wireless networks, while the physical layer security (PLS)techniques hold great potential to enhance the critical secrecy performancetherein. By carefully exploiting the significant signal difference between theNon-Light-of-Sight (NLoS) and Line-of-Sight (LoS) mmWave links, this paperproposes a Sight-based Cooperative Jamming (SCJ) scheme to improve the PLSperformance of mmWave ad hoc communications. In this scheme, each potentialjammer that has no LoS link to its nearest receiver but may have LoS links toeavesdroppers is selected with a certain probability to generate artificialnoise such that channel advantages at legitimate receivers can be achieved. Forperformance modeling of the new jamming scheme, novel and efficient theoreticalapproximation approaches are firstly developed to enable the challenging issueof interference distribution modeling to be tackled, and then a theoreticalframework based on stochastic geometry is proposed to capture the secrecytransmission capacity behavior under the SCJ scheme. Finally, extensivenumerical results are provided to illustrate the SCJ scheme under variousnetwork scenarios.

Secure Millimeter-Wave Ad Hoc Communications Using Physical Layer Security