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Power allocation for distributed detection systems in wireless sensor networks with limited fusion centre feedback
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.ORCID iD: 0000-0003-0762-5743
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2018 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 66, no 10, p. 4753-4766Article in journal (Refereed) Published
Abstract [en]

We consider a distributed detection system for a wireless sensor network over slow-fading channels. Each sensor only has knowledge of quantized channel state information (CSI) which is received from the fusion center via a limited feedback channel. We then consider transmit power allocation at each sensor in order to maximize a J-divergence based detection metric subject to a total and individual transmit power constraints. Our aim is to jointly design the quantization regions of all sensors CSI and the corresponding power allocations. A locally optimum solution is obtained by applying the generalized Lloyd algorithm (GLA). To overcome the high computational complexity of the GLA, we then propose a low-complexity near-optimal scheme which performs very close to its GLA based counterpart. This enables us to explicitly formulate the problem and to find the unique solution despite the non-convexity of the optimization problem. An asymptotic analysis is also provided when the number of feedback bits becomes large. Numerical results illustrate that only a small amount of feedback is needed to achieve a detection performance close to the full CSI case.

Place, publisher, year, edition, pages
2018. Vol. 66, no 10, p. 4753-4766
National Category
Signal Processing Communication Systems Telecommunications
Identifiers
URN: urn:nbn:se:uu:diva-365047DOI: 10.1109/TCOMM.2018.2837101OAI: oai:DiVA.org:uu-365047DiVA, id: diva2:1261661
Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2019-02-13Bibliographically approved

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