Ordered Transmissions for Energy-Efficient Detection in Energy Harvesting Wireless Sensor Networks

Sen Gupta, S and Pallapothu, SK and Mehta, NB (2020) Ordered Transmissions for Energy-Efficient Detection in Energy Harvesting Wireless Sensor Networks. In: IEEE Transactions on Communications, 68 (4). pp. 2525-2537.

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Abstract

Ordered transmissions reduces the number of nodes that transmit in a wireless sensor network (WSN) and yet achieves the same performance as the conventional unordered transmissions scheme (UTS) in which all nodes transmit. However, it breaks down in energy harvesting (EH) WSNs because of missed transmissions by EH nodes that lack sufficient energy. For the Bayesian detection framework, we propose a novel scheme that addresses this challenge for the general case in which the log-likelihood ratio is bounded and has a continuous distribution function. Given the probability that a node misses its transmission, it reduces the average number of transmissions compared to UTS. For truncated Gaussian statistics, we then propose a novel refinement that requires even fewer transmissions and that simultaneously lowers the error probability. We also analyze its performance and show that it lends itself to a computationally-efficient Monte Carlo evaluation. When the time evolution of the battery energies of the nodes is tracked and the probability of a missed transmission becomes a function of the scheme itself, the proposed schemes achieve a markedly lower error probability than both UTS and sequential detection, except when the energy harvested is so less that very few nodes can transmit. © 1972-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Communications
Publisher:	Institute of Electrical and Electronics Engineers Inc. (IEEE)
Additional Information:	Copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc. (IEEE)
Keywords:	Distribution functions; Energy efficiency; Energy harvesting; Error statistics, Bayesian detection; Computationally efficient; Continuous distribution functions; Error probabilities; Gaussian statistics; Log likelihood ratio; Ordered transmissions; Sequential detection, Sensor nodes
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	11 Nov 2020 10:20
Last Modified:	11 Nov 2020 10:20
URI:	http://eprints.iisc.ac.in/id/eprint/65357

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