Abstract
Narrowband power line communication has become a major focus of research with its applicability extending to residential facilities. This article examines data transmission over flexible AC power line cables stretching from the elevator control panel to the cabin. In previous studies, there has been no significant attempt to characterize the Power Line Communication (PLC) channel and noise of an elevator system. In this article, a vector network analyzer and mixed domain oscilloscope along with coupling devices are used to conduct power line channel noise and response measurements for an elevator system. The acquisition of channel transfer functions corresponding to both idle and moving states of the elevator is carried out for the 9 kHz–500 kHz frequency range. A mathematical model is provided for the average frequency response of the PLC channel. The main source of noise is the inverter that supplies power to the motor. The channel exhibits notable variations for frequencies less than 281 kHz while staying relatively consistent for the 281 kHz to 500 kHz frequency range as the elevator changes from idle to moving state. Reed Solomon and convolutional codes along with interleaving to spread erroneous bits are utilized in this work to simulate an orthogonal frequency division multiplexing transceiver. By systematically selecting subcarrier frequencies that do not overlap with the harmonic noise components, simulation results have demonstrated reliable data recovery for signal-to-noise ratio greater than 4 dB.
Highlights
Power line communication (PLC) uses existing infrastructure to facilitate data transmission over cables already established solely for power transmissions
This paper aims to provide new experimental findings regarding narrowband power line communication over flexible AC power lines that stretch from the elevator control panel to the cabin, which can be summarized as follows
The main problems surrounding power line communication (PLC) technology are the varying channel response, as well as the noise introduced onto the received signal
Summary
Power line communication (PLC) uses existing infrastructure to facilitate data transmission over cables already established solely for power transmissions. It provides a detailed design to facilitate data communication over elevator power lines It demonstrates that the use of a PLC system eliminates the need for separate control wiring other than the elevator power line cables. Several factors can affect the reliable transmission of data over the power lines of an elevator system, which include transient surges, noise from nearby electrical devices, radio frequency transmitters, etc. The commonly used surge protection devices for PLC modems include metal oxide varistor (MOV), protection diodes, gas discharge tubes, etc Components such as common-mode chokes are frequently used to eliminate the unwanted common-mode signals induced by radio frequency transmitters. For a narrowband PLC channel, a bandpass filter can help suppress high-frequency noise components outside the transmission frequency range and prevent them from reaching the internal circuitry of the PLC modem [23], [24]. This paper aims to provide new experimental findings regarding narrowband power line communication over flexible AC power lines that stretch from the elevator control panel to the cabin, which can be summarized as follows
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