Faculty Publications
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Item Range assignment with k-power levels in a Wireless Sensor Network(Institute of Electrical and Electronics Engineers Inc., 2018) Lakshmi, M.P.; Shetty D, S.D.Energy minimization in Wireless Sensor Network (WSN) has gained the attention of several researchers because of its diverse applications in the real world. Optimization in power assignment increases the lifetime of a network. Available sensor nodes operate with a set of discrete power levels in which each sensor node can be assigned with one of the power levels from the given set. Dual power assignment problem was studied by researchers in which only two power levels are available for assignment in a WSN. As the Dual power assignment problem is proved to be NP-hard, several approximation algorithms were proposed. We consider k-power level assignment problem for a given set of sensor nodes with the objective of minimizing the total power assigned to the network provided each sensor node is assigned a power level only from the given set. We propose two heuristic algorithms; one is based on Euclidean Minimum Spanning Tree (MST) and the other is an Incremental Heuristic which runs in polynomial time. We present the simulation results to compare and analyze the proposed algorithms. We also conduct the experiments for various number of nodes by varying the number of power levels. © 2018 IEEE.Item Optimal algorithm for minimizing interference with two power levels in wireless sensor networks(Engineering and Technology Publishing, 2019) Lakshmi, M.P.; Shetty D, D.Interference is a major hindrance to the communication in wireless sensor networks which needs to be optimized in order to minimize the total power consumption of the network. A sensor node in a WSN is assigned certain transmission range for sensing and transmission of data. If the transmission between any two nodes is affected by a third node, then it leads to interference. Sender interference of a node in WSN is the number of nodes that lie within the transmission range of that vertex. The receiver interference of a node x is the number of other nodes which include x in their transmission range. In recent days WSNs are operated by a discrete set of power levels in which a limited number of power levels are available which can be assigned to a node. The problem of minimizing the maximum sender interference of a WSN using only two power levels is studied in this paper. An optimal algorithm is presented in this paper which assigns transmission power to the sensor nodes of a given network such that the maximum sender interference is minimized and it results in a connected topology. An algorithm for receiver interference is also proposed using a similar concept, and an extensive simulation is performed to compare the maximum sender and receiver interference for the same instances. © 2019 Journal of Communications.