Paper Info
Title
Adaptive Wavelet Coding Applied in a Wireless Control System.
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.
Year
DOI
Venue
2017
10.3390/s17122901
SENSORS
Keywords
Field
DocType
wireless communications,wavelet coding,time diversity,Rayleigh fading,control loop
Time diversity,Multipath propagation,Rayleigh fading,Wireless,Code rate,Fading,Electronic engineering,Spectral efficiency,Engineering,Bit error rate
Journal
Volume
Issue
ISSN
17
12.0
1424-8220
Citations 
PageRank 
References 
0
0.34
12
Authors
3
Name
Order
Citations
PageRank
Felipe O S Gama100.34
Luiz Felipe Q. Silveira2196.32
Salazar, A.O.322.82