How to suppress interference in PLC power line carrier signals?

In power line carrier PLC systems, carrier signal interference suppression requires a multi-dimensional approach, addressing filtering, impedance matching, and signal integrity. At the power line interface, a multi-stage filtering network should be deployed. Firstly, CMZ3225A-101T or CMZ3225A-510T series common-mode inductors should be used to suppress common-mode noise; their 50-100uH inductance value effectively filters conducted interference in the MHz band. Simultaneously, PBZ1608A-102Z0T ferrite beads should be used to attenuate differential-mode noise. For the carrier signal receiver, it is recommended to use the low-capacitance ESD protection device ESDLC5V0D3B, with a capacitance value less than 3pF, providing electrostatic protection without affecting signal integrity. Furthermore, impedance matching networks should be used to reduce signal reflection, and differential transmission should be employed to enhance common-mode interference immunity, thus constructing a complete signal protection barrier at the system level.