Abstract
This chapter studies the performance of a wireless sensor network in the context of binary detection of a deterministic signal. The work considers a decentralized organization of spatially distributed sensor nodes, deployed close to the phenomena under monitoring. Each sensor receives a sequence of observations and transmits a summary of its information, over fading channel, to a data gathering node, called fusion center, where a global decision is made. Because of hard energy limitations, the objective is to develop optimal power allocation schemes that minimize the total power spent by the whole sensor network under a desired performance criterion, specified as the detection error probability. The fusion of binary decisions is studied in this chapter by considering two scenarios depending on whether the observations are independent and identically distributed (i.i.d.) or correlated. The present work aims at developing a numerical solution for the optimal power allocation scheme via variations of the biogeography-based optimization algorithm. The proposed algorithms have been tested for several case studies, and their performances are compared with constrained versions of the differential evolution algorithm, the genetic algorithm, and the particle swarm optimization algorithm.
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Notes
- 1.
The number of sensor nodes and the number of distinct messages are fixed beforehand. This implicitly limits the amount of data available at the fusion center. The quantity of information provided to the fusion center by a network of L sensors, each sending one of D ℓ possible messages, does not exceed \(\sum_{\ell=1}^{L} \lceil\log_{2}(D_{\ell}) \rceil\) bits per channel use [23].
- 2.
In general, Σ v is not a diagonal matrix unless the observation noise is independent and identically distributed (i.i.d.).
- 3.
The assumption that the transmission is idealized, i.e., the information sent from local sensors is assumed to be received intact at the fusion center may be reasonable for some applications, but it may not be realistic for many WSNs where the transmitted information has to endure both channel fading and noise/interference. Acquiring channel state information may be too costly for a resource-constrained sensor network. It may also be impossible to accurately estimate the quality of a fast-changing channel. Hence, it can be argued to be reasonable to assume that this information is available at the fusion center.
- 4.
Correlation degree ρ=1 means that two observations are perfectly correlated. Correlation degree 0<ρ<1 indicates that two observations are partially correlated (i.e., spatial correlation), while ρ=0 implies that two observations are independent of each other.
- 5.
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Boussaïd, I., Chatterjee, A., Siarry, P., Ahmed-Nacer, M. (2013). A Comparative Study of Modified BBO Variants and Other Metaheuristics for Optimal Power Allocation in Wireless Sensor Networks. In: Chatterjee, A., Nobahari, H., Siarry, P. (eds) Advances in Heuristic Signal Processing and Applications. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37880-5_5
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