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Channel state information (CSI) has been recently shown to be useful in performing security attacks in public WiFi environments. By analyzing how CSI is affected by the finger motions, CSI-based attacks can effectively reconstruct text-based passwords and locking patterns. This paper presents WiGuard, a novel system to protect sensitive on-screen gestures in a public place. Our approach carefully...
The uplink spectrum of cellular networks is often underutilized due to the asymmetric behavior of wireless data services. To enhance the efficiency, a full-duplex (FD) cellular system is proposed to reuse the uplink spectrum for concurrent uplink and downlink transmissions. By jointly designing transmit beamforming and power control, a weighted sum-interference power minimization problem is formulated...
A novel high gain printed log-periodic dipole antenna with parasitic cell, based on the substrate integrated waveguide technologies is presented. This antenna is fed by SIW which simplifies the structure and reduces the losses. The gain is improved through adding the directors and parasitic patches at the end of the shortest log-periodic dipole cell in the antenna combining the technologies about...
With the rapid development of wireless technologies and rising demand for high speed multimedia applications, a variety of wireless communication networks have been deployed in the same geographic region to provide seamless services. The coexistence of these networks makes the electromagnetic spectrum environment extraordinary complex and irregular, thus bringing in great difficulty for spectrum monitoring...
For wireless sensor networks (WSNs), which have crucial limitation on energy as all the nodes rely on nonrenewable batteries and are often inconvenient to be replaced or recharged, the energy efficiency that has a close relationship with system longevity becomes a significant issue. In this paper, a cross-layer strategy in terms of physical layer and network layer is proposed for maximizing equilibrium...
Base on the analysis of traditional long-range medical healthcare system, the human body healthcare system used in the family is introduced in this paper. According to the requirements of family health monitor system, the paper compares several kinds of wireless communication technology which uses in the family, The system is presented to combine the short-range wireless communication technology Zigbee...
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