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Sensors 2017, 17(12), 2901; https://doi.org/10.3390/s17122901

Adaptive Wavelet Coding Applied in a Wireless Control System

Department of Computer Engineering and Automation, Universidade Federal do Rio Grande do Norte, Lagoa Nova, Natal 1524, Brazil
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Received: 19 October 2017 / Revised: 14 November 2017 / Accepted: 17 November 2017 / Published: 13 December 2017
(This article belongs to the Section Sensor Networks)
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Abstract

Wireless control systems can sense, control and act on the information exchanged between the wireless sensor nodes in a control loop. However, the exchanged information becomes susceptible to the degenerative effects produced by the multipath propagation. In order to minimize the destructive effects characteristic of wireless channels, several techniques have been investigated recently. Among them, wavelet coding is a good alternative for wireless communications for its robustness to the effects of multipath and its low computational complexity. This work proposes an adaptive wavelet coding whose parameters of code rate and signal constellation can vary according to the fading level and evaluates the use of this transmission system in a control loop implemented by wireless sensor nodes. The performance of the adaptive system was evaluated in terms of bit error rate (BER) versus E b / N 0 and spectral efficiency, considering a time-varying channel with flat Rayleigh fading, and in terms of processing overhead on a control system with wireless communication. The results obtained through computational simulations and experimental tests show performance gains obtained by insertion of the adaptive wavelet coding in a control loop with nodes interconnected by wireless link. These results enable the use of this technique in a wireless link control loop. View Full-Text
Keywords: wireless communications; wavelet coding; time diversity; Rayleigh fading; control loop wireless communications; wavelet coding; time diversity; Rayleigh fading; control loop
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gama, F.O.S.; Silveira, L.F.Q.; Salazar, A.O. Adaptive Wavelet Coding Applied in a Wireless Control System. Sensors 2017, 17, 2901.

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