Abstract
Millimeter-wave (mmWave) communications are highly promising to improve the capacity of modern wireless networks, while the physical layer security (PLS) techniques hold great potential to enhance the critical secrecy performance therein. By carefully exploiting the significant signal difference between the Non-Light-of-Sight (NLoS) and Line-of-Sight (LoS) mmWave links, this paper proposes a Sight-based Cooperative Jamming (SCJ) scheme to improve the PLS performance of mmWave ad hoc communications. In this scheme, each potential jammer that has no LoS link to its nearest receiver but may have LoS links to eavesdroppers is selected with a certain probability to generate artificial noise such that channel advantages at legitimate receivers can be achieved. For performance modeling of the new jamming scheme, novel and efficient theoretical approximation approaches are firstly developed to enable the challenging issue of interference distribution modeling to be tackled, and then a theoretical framework based on stochastic geometry is proposed to capture the secrecy transmission capacity behavior under the SCJ scheme. Finally, extensive numerical results are provided to illustrate the SCJ scheme under various network scenarios.
Highlights
T HE explosive growth of mobile devices in the past decade poses a significant challenge to the capacity of modern wireless networks
With the help of the approximations, we develop a theoretical framework based on stochastic geometry to derive the connection probability and secrecy probability of transmission pairs, based on which the secrecy transmission capacity (STC) analysis is conducted
This implies that the proposed Sight-based Cooperative Jamming (SCJ) scheme can can improve the network STC performance by deploying more jammers The reason for the unchanged optimal STC under the SCJ scheme is that, when λP exceeds some threshold, the optimal jamming parameter ρ∗ decreases to 0
Summary
T HE explosive growth of mobile devices in the past decade poses a significant challenge to the capacity of modern wireless networks. The PLS performance of microwave communications has been extensively studied (e.g., [9]–[13]), the results cannot be directly applied to the mmWave communications due to the intrinsic physical layer features of mmWave channels [14]–[16]. This motivates researchers to investigate the PLS performance of mmWave communications. Please refer to the Related Work section (Section II) for the detailed introduction of these works
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