Deployment Adviser Tool for Wireless Sensor Networks

This paper presents a system for the purpose of field deployment of nodes in wireless sensor networks. We propose a mobile phone based deployment adviser tool which is robust as well as practically implementable. The tool advises a layman deployer to create a optimized wireless sensor network by placing of the nodes according to application requirements. The tool is presented here as logically linked sub-modules. Each sub-modules are described in detail. Also we propose an algorithm which helps in distributing the power consumption among the nodes in the network, thus, increasing the network lifetime. The adviser tool has been verified by implementing it in IITH mote. The tool we propose has significant implication since it greatly eases, but more importantly extracts the best performance possible while deploying the wireless sensor network

Space Based Solar Power System: Analysis of Atmospheric Transmittance for Laser Beam Propagation

Space based solar power system is described. The above system has various subsystems and one of its subsystems, propagation of captured solar energy in the form of electromagnetic waves, is considered here. Various alternatives for the above exist, but Laser is the touted as a promising candidate for such propagation in future. In this paper Transmittance is calculated at different altitudes using the known atmospheric extinction coefficients for the molecular and aerosol components. The analysis is performed for three different wavelengths in infrared region: 1.06, 1.67, 2.17 microns, which happens to be the operating wavelengths for high powered Lasers. Inferences are drawn from the results obtained from the simulation

EEDF-MAC: An Energy Efficient MAC Protocol for Wireless Sensor Networks

Recent advances in wireless technology have brought us closer to the vision of pervasive wireless sensor networks. In sensor networks, the nodes have limited energy resources and the applications generally demand timely delivery of the packets. Therefore, high energy efficiency and reduced latency are of paramount importance. The medium access control layer plays a crucial role in managing the energy spent on communication and keeping the latency in check. In this paper, a real time wireless media access control protocol based on earliest deadline first scheduling scheme is proposed. Unlike its predecessors, this new protocol is applicable to both event-driven and clock-driven nodes with salient features being high energy efficiency and priority based latency. We establish the improved latency performance over carrier sense multiple access protocol, through simulation of wireless sensor network in network simulator-3. Then, we present a mathematical model to obtain the lower bound on the fraction of energy saved by the use of the proposed protocol as opposed to existing protocols. This improvement in latency performance facilitates an increase in cluster size and energy efficient communication ensures increased lifetime of the sensor network, which makes our protocol a promising choice for the future wireless sensor network