How to reduce harmonic interference from power line carrier PLC?

Reducing harmonic interference from power line carrier (PLC) signals requires a two-pronged approach: harmonic suppression and spectrum management. At the transmitter, predistortion techniques should be employed to optimize the carrier signal waveform and reduce harmonic components. At the hardware level, high-quality factor LC resonant circuits, such as the CMZ2012A-900T combined with NPO ceramic capacitors, should be used to form a narrowband frequency-selective network, suppressing harmonic output. For power supply-induced harmonics, active power factor correction circuits should be deployed to reduce current harmonic content. At the receiver, a highly selective bandpass filter should be used, with the center frequency precisely tuned to the carrier frequency, and low-loss dielectric materials should be used to ensure stable filtering performance. Simultaneously, an adaptive harmonic cancellation algorithm should be implemented in the system software. Through this hardware-software co-design, carrier harmonic interference can be reduced by more than 25 dB.