Minimization of Energy Consumption Per Bit of Wireless Networked Control Systems with Time-Correlated Nakagami-m Fading Channels

Rafaela Scaciota Simões da Silva, Glauber Brante, Guilherme Luiz Moritz, Richard Demo Souza

DOI: 10.14209/SBRT.2020.1570645612

Evento: XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2020)

Keywords: wireless networked control systems time-correlation consecutive outage events energy consumption

Abstract

In this paper we study the energy consumption of wireless networked control systems (WNCSs) with time correlation. Our proposal is to minimize the energy consumption, assuming that the actuators may be battery-powered devices, without affecting the control system stability, which may be impacted by communication errors. Firstly, the communication channel is modeled according to a time-correlated Nakagami-m fading. So, we obtained the outage probability in this scenario. With that in hand, we derived a closed-form expression for the transmission power that minimizes the amount of energy consumed per bit in this WNCS scenario. Our results show that the energy consumption increases with the correlation. This is due to the fact that stability depends on the number of consecutive outage events, so that time-correlation implies in higher outage probability, increasing the transmit power in order to maintain the system stable.

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