Development of line coupling circuit for OFDM PLC modem

• Main Authors: Batingal, Marion Albert T., De Guzman, Errol Marc B., Gaw, Charles Michael C., Meroy, Mark Lemmuel A.
• Format: text
• Language: English
• Published: Animo Repository 2014
• Subjects: Electric power transmission; Electric lines > Carrier transmission; Electrical and Electronics; Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/11283
• Institution: De La Salle University

Power Line Communications (PLC) is an emerging technology that utilizes the power lines as the communication medium to transmit control signal or data from one device to another. This is made possible through the use of a PLC modem. The line coupling circuits are vital in the operation of a power line communication modem. The power line control is found to have an impedance of 2 ohms to 20 ohms in low voltage networks particularly in-building wiring while most PLC modems have an impedance of about 50 ohms. This impedance mismatch would require higher transmit power and could potentially produce damaging EMI or spurious radiation. The line coupling unit (LCU) must be designed to match the modem impedance with the power lime impedance while filtering the harmful 220V, 60 Hz power line voltage.