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Most existing studies on cooperative relay in wireless sensor networks (WSNs) concentrate on link capacity or symbol error rate (SER) constrained power allocation. We advance the study in two aspects. First, we adopt the packet error rate (PER) constraint instead of SER or link capacity constraint. Assuming non-coherent frequency shift keying (NC-FSK) modulation (used in Mica2 motes) and selection...
Selective encryption for video streaming was proposed for efficient multimedia content protection. However, the issues on joint optimization of video quality, content protection, and communication energy efficiency in a wireless sensor network (WSN) have not been fully addressed in the literature. In this paper, we propose a scheme to optimize the energy, distortion, and encryption performance of...
The reliability of data transmission and the energy consumption of wireless nodes in wireless sensor networks (WSNs) are important issues as interest in this type of network increases. IEEE 802.15.4 is a suitable protocol for WSNs because it was designed for low-power operation via wireless communications. The guaranteed time slot (GTS) of IEEE 802.15.4 can usually be used for cyclic data transmission...
Wireless sensor networks are characterized by dense deployment of energy constrained nodes. Owing to the deployment of large number of sensor nodes in uncontrolled hostile or harsh environments and unmonitored operation, it is common that a node becomes inactive due to a node failure or exhaustion of the respective energy resource. Such node failures result in the reduction of the cluster quality...
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