Power line communication over flexible cables for elevator cabins

Narrowband power line communication has been a significant focus of study, with potential applications in residential settings. The data transfer across flexible AC power line cables extending from the elevator control panel to the cabin is the subject of this thesis. In prior research, there has never been a serious attempt to characterize the PLC channel response and noise of an elevator system. An elevator system's power line channel noise is measured using a mixed domain oscilloscope. The channel response, on the other hand, is measured using a vector network analyzer. These measurement devices are connected to the AC power lines of an elevator system via coupling devices. For the 9 kHz - 500 kHz frequency range, channel transfer functions corresponding to the elevator's idle and moving states are acquired. For the average PLC channel frequency response, a mathematical model is presented. The inverter used for elevator speed control is the primary noise source. As the elevator moves from idle to moving mode, the channel shows noticeable variances for frequencies less than 281 kHz while generally constant within the 281 kHz-500 kHz frequency range. This thesis has utilized Reed Solomon, convolutional codes, and interleaving to distribute erroneous bits to model an orthogonal frequency division multiplexing transceiver. Acquired measurement data for the channel response and noise is used to model the transceiver system. Simulation experiments have shown successful data recovery for a signal-to-noise ratio larger than 4 dB by methodically selecting subcarrier frequencies that do not coincide with the harmonic noise components.