Abstract: The invention relates to a method for evaluating the usability of a sub-carrier of a BPL (broadband power-line) signal, in particular in order to avoid mutual influencing of the BPL signal and a further signal, wherein the BPL signal has a plurality of sub-carriers and one symbol can be transmitted in each of the sub-carriers. The method comprises the following steps: extracting a received value y[k] from a sub-carrier of a received BPL signal, rectifying the received value y[k] using an estimated transfer function ? of the transmission channel, deciding on a symbol d[k] that is coded in the received value y[k], distorting the symbol d[k] using the estimated transfer function ? of the transmission channel, calculating a difference between the received value y[k] and the processed signal d[k]·? and deciding on the usability of the sub-carrier on the basis of the difference y[k]?d[k]·?.

Abstract: The invention relates to a method for evaluating the usability of a sub-carrier of a BPL (broadband power-line) signal, in particular in order to avoid mutual influencing of the BPL signal and a further signal, wherein the BPL signal has a plurality of sub-carriers and one symbol can be transmitted in each of the sub-carriers. Said method comprises the following steps: extracting a received value y[k] from a sub-carrier of a received BPL signal, rectifying the received value y[k] using an estimated transfer function ? of the transmission channel, deciding on a symbol d[k] that is coded in the received value y[k], distorting the symbol d[k] using the estimated transfer function ? of the transmission channel, calculating a difference between the received value y[k] and the processed signal d[k]·?, and deciding on the usability of the sub-carrier on the basis of the difference y[k]?d[k]·?.

Abstract: A method for determining notching parameters for a PLC (Power Line Communication) Signal in a PLC system, where, by notching in a targeted fashion, frequency ranges are omitted in the PLC signal and the notching parameters are selected such that any interference of the PLC signal with a radio signal is largely avoided, is characterized with regards to the determination of notching parameters even during operation of the PLC system such that, at least for a section of the PLC signals, a signal-interference ratio (SIR) is formed which, depending on the SIR, assesses the signal strength of a radio signal and, based on the assessment notching parameters, are determined or adjusted. A respective PLC system is provided.