Method and apparatus for transmitting signals over a wire connection

A method of transmitting data from a transmitter device to one or more receiver devices, each of the one or more receiver devices being connected to the transmitter device via a respective wire connection, the transmitter device being configured to transmit signals onto the wire connections over one or more different channels, the method comprising, for each of the one or more different channels:

• determining a value of a function sj,jm, the function being
• s
• ~
• j
• ,
• j
• m
• =
• 2
• b
• max
• -
• 1
• γ
• j
• ,
• j
• m
• where:
• j is a channel index;
• bmax is an upper bound for a channel capacity of the one or more channels;
• γj,jm is a gain of the jth channel;
• and
• m is a frequency index for M different tones;
• determining a transmission power sj,j for transmitting data along that channel, wherein the transmission power sj,jm is:
• sj,jm=min{pm,{tilde over (s)}j,jm}
• where:
• pm is a power mask for transmitting the data over the one or more different channels;
• and
• transmitting, by the transmitter device, data over that channel to one or more of the receiver devices, the data being transmitted at the transmission power sj,jm determined for that channel.