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Adaptive Wavelet Coding Applied in a Wireless Control System

编码的适应小浪在一个无线控制系统适用

作     者:Gama, Felipe O. S. Silveira, Luiz F. Q. Salazar, Andres O. 

作者机构:Univ Fed Rio Grande do Norte Dept Comp Engn & Automat BR-1524 Natal RN Brazil 

出 版 物:《SENSORS》 (传感器)

年 卷 期:2017年第17卷第12期

页      面:2901-2901页

核心收录:

学科分类:0710[理学-生物学] 071010[理学-生物化学与分子生物学] 0808[工学-电气工程] 07[理学] 0804[工学-仪器科学与技术] 0703[理学-化学] 

基  金:CAPES 

主  题:wireless communications wavelet coding time diversity Rayleigh fading control loop 

摘      要: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.

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