Power line communication (PLC) refers to the carrying of data on electricity transmission and distribution lines. By using specialized modems installed at both the transmitting and receiving ends, PLC provides bidirectional transmission of data on existing power lines. Through advanced modulation techniques, PLC aims to avoid causing electromagnetic interference to other systems while allowing for broadband or narrowband data communication.

History and Development
The concept of carrying data through power lines is not new. Early versions involved simply transmitting audio signals over AC power wiring in buildings. However, these simple systems could only function over short distances and had issues with noise interference. The past few decades have seen considerable advancements in digital signal processing and modulation, allowing for more robust and higher-speed PLC.

Early commercial PLC systems emerged in the late 1990s and targeted applications in home automation, security systems, and other low-speed uses. Following standardization efforts by groups like HomePlug Alliance and ITU-T, broadband PLC started gaining traction after 2000 for applications such as Internet access. Most major nations now have public or private PLC network pilots underway to test its viability for smart grid, telecom backhaul, and other uses.

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Resources –

What Are the Challenges in Power Line Communication Implementation and How Can We Overcome Them?

What Are the Key Developments in the Power Line Communication Market?

How is Power Line Communication Enhancing the Future of IoT?