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In this paper, the authors propose a novel MIMO-aided security scheme. By exploiting an extra dimension provided by MIMO systems for adding artificial noise to the transmission process, the physical-layer security is enhanced as a result. In the proposed scheme the physical-layer may rely on upper-layer encryption techniques for security, which results in a cross-layer security scheme. As wireless devices become increasingly pervasive and essential, they are becoming both targets of attacks and the very weapons with which such attacks can be carried out. Compared with wireline networks, wireless networks are open to intrusion from the outside without the need of a physical connection.
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