Patent ID: 7991072

Claim:
A telecommunication system with a modem having a controlling module coupled to a central office data transmission module comprising: a transmitter configured to transmit at least one channel via a communication line, said channel being configured to transport user data signals with modulation having a bitload that is modifiable, said bitload being a set of numbers describing the number of information bits per modulation symbol for each carrier; and an artificial noise generator, being a module of said data transmission module, coupled to said transmitter and configured, to inject an artificial noise into the transmitter to influence the user data signals transmitted by said data transmission module to the communication line, wherein said artificial noise corresponds to a model of the sum of loop noises contributed by signals transmitted on a plurality of n−1 communication lines arranged in a cable containing a plurality of n communication lines, of which the first mentioned communication line is one member of the plurality of communication lines.