Patent ID: 8467523

Claim:
A method of cancelling interference between a signal carried by an electrical line, where powerline communications operate, in a digital service distribution system at the home of a subscriber and a signal carried by a telephone line of said system that is situated close to the electrical line, data symbols X 1 of the same nature with i=(1,2) being obtained by a multicarrier coding method and sent over said electrical and telephone lines, an estimate of the symbol on the electrical line that interferes with the symbol carried by telephone line is given by ( ) = ( H T ⁢ H ) - 1 ⁢ H T ⁡ ( Y 1 Y 2 ) in which T is the transpose of a matrix H the coefficients of which are complex numbers that model the transmission channels of the symbols on said lines as well as interference thereon by Rayleigh channels independent of one another and each varying in time, and a subtraction of said estimate of the symbol carried by the telephone line is given by Y 1 −h 1,2 in which h 1,2 is the complex number relating to the Rayleigh channel modelling the interference of the symbol X 2 sent over the electrical line with the symbol Y 1 carried by the telephone line, wherein said method comprises a first step during which the complex numbers of the matrix that relate to the transmission channel on the electrical line are determined by forcing to zero the signal carried by the electrical line and a second step during which the complex numbers that relate to the channel of the telephone line are determined by sending a signal over the telephone line and considering the complex numbers of the transmission channel of the electrical line determined at the first step.