Patent ID: 7039125

Claim:
A power back-off method to mitigate the effects of far-end crosstalk (FEXT) noise in a communication system comprising at least one transmitter k, the transmitter k transmitting to a central site via a corresponding channel, the method comprising: determining a transmit power spectral density for the transmitter k, S(f,l k ), according to: S ⁡ ( f , l k ) = ( l k l R ) υ ⁢ S ⁡ ( f , l R ) ·  H ⁡ ( f , l R )  2  H ⁡ ( f , l k )  2 ⁢ ⁢ for ⁢ ⁢ l k ≤ l R wherein l k is a channel length of the channel corresponding to the transmitter k, H(f,l k ) is a channel transfer function of the channel corresponding to the transmitter k, l R is a reference channel length, H(f,l R ) is a reference channel transfer function, S(f,l R ) is a reference transmit power spectral density, and υ≠−1 or 0; and controlling transmitter k to transmit at the transmit power spectral density S(f,l k ).