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Secure transmission is one of the most important aspects of wireless communications systems. In contrast to traditional cryptographic methods, physical layer security exploits the propagation channel to ensure security. It has been proven that a time-varying reciprocal channel can be used to generate secret keys which are secure even when an eavesdropper is located near one of the communicating nodes...
A recent method has been proposed for determining the optimal radiation characteristics of antennas that maximize the diversity gain for a given antenna aperture and power angular spectrum of the incident field. However, because this approach results in antennas whose current distributions overlap in the aperture, it is difficult to achieve the radiation characteristics using practical designs. This...
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