Patent ID: 8619844

Claim:
Method of reducing interference between a first signal of the carrier current type (Se) transmitted between modems (M CPL ) in an electrical network (Re) and a second signal (S) transmitted between modems (M) in another network (R), the said signals (Se, S) being coded by the distribution of data over allocated carrier frequencies in the same reserved frequency band (BF), the method comprising a step (1) of measurement, by each modem (M CPL ) in the electrical network, of transmission characteristics of each carrier frequency (F) that may be used for coding the first signal (Se), and a step (3) of optimisation of the distribution of the data of the first signal (Se) on carrier frequencies so as to minimise the transmission power level of carrier frequencies subject to the constraint of a transmission rate of the first signal (Se), characterised in that it comprises a step (2) of detection, by analysing the measured transmission characteristics, of at least one carrier frequency (F 2,n ), referred to as the second carrier frequency, that is allocated or may be allocated for coding the second signal (S) and is common with at least one carrier frequency (F 1,m ), referred to as the first carrier frequency, that is allocated for coding the first signal (Se), and the measured transmission characteristics of which are degraded with respect to those of a previous measurement, and optimisation of the distribution of the data of the first signal (Se) subject to the constraint of a transmission rate of the first signal (Se) is carried out so as to minimise the transmission power level of the first carrier frequencies (F 1,m ) that are common with the second carrier frequencies (F 2,n ) thus detected.