PowerGuard: Power Line Communication Interference Reduction and Elimination System
Technology Transfer & Commercialisation

PowerGuard: Power Line Communication Interference Reduction and Elimination System

Silver Medal

PowerGuard: Power Line Communication Interference Reduction and Elimination System

A Power-Line Communication (PLC) receiver has a filter, a time domain processor, a frequency-domain processor, and a forward-error-correction decoder. A narrow-band frequency detector attached to the frequency-domain processor examines the frequency-domain signal for a highest-power sub-carrier frequency. This highest power is compared to an average power of all other sub-carriers and a narrow-band interferer is detected when the highest power is significantly above the average. When the interferer is detected N times in a time period, a control layer adds this sub-carrier frequency to a removed list and recalculates filter coefficients to add a notch filter at the frequencies of the removed list. Updated filter coefficients are loaded into the filter to implement notch filters. When the current power of a sub-carrier signal on the removed list falls significantly below the average power, the sub-carrier is deleted from the removed list and coefficients recalculated to remove the notch filter.