Banca de QUALIFICAÇÃO: FELIPE OLIVEIRA SIMÕES GAMA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : FELIPE OLIVEIRA SIMÕES GAMA
DATA : 28/11/2018
HORA: 09:00
LOCAL: Auditório do LAMP
TÍTULO:

Development of Wavelet Coding and IEEE 802.15.4-based Communications Systems for Industrial Wireless Sensor Networks

PALAVRAS-CHAVES:

Wireless Communications, Wavelet Coding, Time Diversity, Rayleigh Fading, Control Loop, IEEE 802.15.4.

PÁGINAS: 50
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Elétrica
SUBÁREA: Medidas Elétricas, Magnéticas e Eletrônicas; Instrumentação
ESPECIALIDADE: Sistemas Eletrônicos de Medida e de Controle
RESUMO:

With the advent of Industry 4.0 wireless communication has become a trend for signal transmission in industrial environments, sparing features and enabling new applications when compared to wired communications systems. In this context, the transmission of data between sensor and controller within control loop using wireless interconnected nodes is susceptible to the degenerative effects produced by the multiple propagation paths. Nevertheless, most industrial wireless sensor network standards provide no error-control mechanism, which would be useful for improving communication reliability and efficiency, as they are based on the IEEE 802.15.4 protocol. In order to minimize these destructive effects characteristic of wireless channels, several techniques have been investigated recently. Among them, the wavelet coding is presented as a good alternative for the nodes interconnected by wireless communication due to its robustness to the effects of the wireless channel and its low computational complexity. This work is based on an approach that explores wavelet matrices for the design of finite impulse response (FIR) filters used in the coding of the complex signals generated by the physical layer of the IEEE 802.15.4 protocol. A new transmission system is proposed that is still based on the IEEE 802.15.4 protocol, which allows to maintain the interoperability with legacy systems and to still achieve superior performance to the requirements for the establishment of control systems by networks wireless. Specifically, it is expected that the proposed system will increase the reliability of the communication and thereby decrease the retransmission events caused by the wireless channel over the transmitted data packets. In particular, the communication delays derived from these retransmission events seriously interfere with the control system, as it does not guarantee the time constraints of the control signal. In addition, an important point regarding the performance of the proposed system is the possibility to improve the reliability of the communication without diminishing the spectral efficiency. The proposed system also allows for an adaptive performance in terms of the coding rate and parameters of the wavelet matrix, without a significant increase in the implementation complexity. The proposed communication system will be implemented using the software concept radio concept in the GNU Radio development environment. The performance of the communication system will be evaluated in terms of bit error rate (BER) versus Eb /N0 and spectral efficiency, considering a time-variant channel model with flat Rayleigh fading. In addition, the effects of the transmission system will be considered in the controllability analysis of a control system.

MEMBROS DA BANCA:
Presidente - 1149567 - ANDRES ORTIZ SALAZAR
Interno - 1543191 - LUIZ FELIPE DE QUEIROZ SILVEIRA
Interno - 1412682 - VICENTE ANGELO DE SOUSA JUNIOR
Externo à Instituição - ELMER ROLANDO LLANOS VILLAREAL - UFERSA
Externo à Instituição - JEFFERSON DOOLAN FERNANDES - IFRN