Unmanned aerial vehicles (UAVs) are widely considered as key enablers for future wireless networks due to their advantages, such high mobility and flexible deployment. In this paper, the UAV assisted secure communication system is investigated, where deployed mobile jammer prevent eavesdropper from overhearing confidential message. With objective of maximizing secrecy rate, a joint optimization...

Wireless Sensor Networks (WSNS) have become an indispensable tool in this epoch of technological advancements, particularly for progress made the Internet things. sensor nodes are deployed to collect and transmit vital data from environment a base station analysis. Nevertheless, limited battery power is rapidly drained when they stay awake extended period. Research has shown that significant so...

We propose application-layer coding schemes to recover lost data in delay-sensitive uplink (sensor-to-gateway) communications the Internet of Things. Built on an approach that combines retransmissions and forward erasure correction, proposed schemes' salient features include low computational complexity ability exploit sporadic receiver feedback for efficient recovery. Reduced is achieved by ke...

This paper investigates the physical-layer security in a Virtual Antenna Array (VAA)-aided Device-to-Device Multicast (D2DM) communication system, where User Equipments (UEs) who cache common content will form VAA system and cooperatively multicast to UEs desire it. Specifically, with target of securing VAA-aided D2DM under threat multiple eavesdroppers, we propose secure beamforming scheme by ...

Use of Wireless sensor networks have been widely seen in the fields of target detection and tracking, environmental monitoring, industrial process monitoring, and tactical systems.In wireless sensor networks nodes work with a incomplete power source, energy efficient operations in an important factor of the nodes in wireless sensor network. Energy conservation plays important role in different ...

In the area of wireless mobile communication, minimizing energy consumption as well as maximizing data throughput in medium access control (MAC) layer is a very important research issue. The Distributed Coordination Function (DCF) of IEEE 802.11 provides the power saving mechanism (PSM) that allows nodes to remain silent in ‘doze mode’ for reducing energy consumption. However, IEEE 802.11 PSM i...

As computing becomes increasingly mobile, the demand for information about the environment, or context, becomes of significant importance. Applications must adapt to the changing environment, however acquiring the necessary context information can be very expensive because collecting it usually requires communication among devices. We explore collecting reasonably accurate context information p...

We propose a joint power control and quality aware routing scheme for rechargeable wireless sensor networks (WSNs) in order to achieve reliable network operation in the presence of spatial and temporal variations of energy resources. The proposed scheme reduces the energy consumption in sensor nodes that have low remaining battery life through cooperative and network-wide adaptations of transmi...