POWER LINE COMMUNICATION SYSTEM WITH NFC CONTROL FOR IOT DEVICES

Power Line Communication is a technology that enables the transmission of data signals over existing power lines, allowing electrical wiring to serve a dual purpose: delivering power and enabling data communication. It is widely used in both residential and industrial settings to create communication networks without the need for additional dedicated wiring. Proposed technology can be a highly effective for the systems with limited physical access, or even for the already built systems modernization. This paper describes the modified physical layer inside of the PLC networks. This type of communication intended to work for DC power nodes. The data transmission takes place between PLC host and PLC nodes. Each step of the signal transfer is validated on the laboratory bench setup with signal quality calculations. Bench measurements are followed by a software simulation. The PLC Host receives transmission data from NFC EEPROM and performs signal procession then, forms analog waveform for injection. The paper contains a detailed NFC-V protocol analysis and description with communication waveform sample capturing and decoding operations. As the result of signal procession, the main PLC controller block forms a certain sequential analog signal, that is injected into feedback of the DC-to-DC converter. The PLC controller output signal described as a custom physical layer for proposed communication protocol. The PLC node, connected to a powerline, powered by the PLC Host. The node uses only the negative and positive power rails as the signals for both data transfer and self-powering functions. The received modulated signal passes through a band pass filter with 15kHz centre frequency, 158 MHz bandwidth and amplification stage of 20dB. The analog to digital decode operations are handed by a mixed signal ASIC. The decode results are validated on laboratory bench setup with visual ASK to SPI decode operation representations. The modulation signal, injected into the power line, is compared with return signal, received from power node after the filtering and amplification stages. Paper contains a resulting quality parameter analysis and system feasibility conclusions.