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Wireless Physical-Layer Security Performance Of Uwb Systems, Miyong Ko
Wireless Physical-Layer Security Performance Of Uwb Systems, Miyong Ko
Masters Theses 1911 - February 2014
Traditionally, spread-spectrum systems have been employed to provide low probability-of-intercept (LPI) and low probability-of-detection (LPD) performances at the physical layer, but the messages transmitted over such a system are still encrypted with a powerful cipher to protect their secrecy. Our challenge is to find a solution to provide an additional level of security at the physical layer so that simple systems such as RFID tags with limited resources can be secure without using standard encryption. It has recently been suggested that the cryptographic security of the system can be enhanced by exploiting physical properties of UWB signals. With an eavesdropper …
Leveraging Multi-Radio Communication For Mobile Wireless Sensor Networks, Jeremy J. Gummeson
Leveraging Multi-Radio Communication For Mobile Wireless Sensor Networks, Jeremy J. Gummeson
Masters Theses 1911 - February 2014
An important challenge in mobile sensor networks is to enable energy-efficient communication over a diversity of distances while being robust to wireless effects caused by node mobility. In this thesis, we argue that the pairing of two complementary radios with heterogeneous range characteristics enables greater range and interference diversity at lower energy cost than a single radio. We make three contributions towards the design of such multi-radio mobile sensor systems. First, we present the design of a novel reinforcement learning-based link layer algorithm that continually learns channel characteristics and dynamically decides when to switch between radios. Second, we describe a …