Multi-tone system with oversampled precoders

A data transmission circuit, comprising:

• an interface for receiving a data stream for transmission;
• a data steam splitter that splits the data stream to produce multiple substreams, each substream having a respective symbol rate that is lower than a symbol rate of the data stream;
• a plurality of parallel data preparation circuits, wherein each data preparation circuit prepares a respective substream for transmission and generates a respective sub-channel signal;
• wherein at least a first data preparation circuit of the plurality of parallel data preparation circuits includes a first analog filter matrix, a first portion of the first analog filter matrix providing pre-emphasis of the respective sub-channel signal and attenuation of signals outside of a respective band of frequencies corresponding to the respective sub-channel signal, a second portion of the first analog filter matrix for producing a signal for reducing interference between two or more respective sub-channel signals, and wherein the first portion of the first analog filter matrix operates at a sample rate greater than the respective symbol rate of the first substream;
• and
• a combiner for combining the respective sub-channel signals to generate a data transmission signal.

A method of transmitting data, comprising:

• receiving a plurality of substreams of a data stream, wherein each of the respective substreams has a respective symbol rate substantially less than a symbol rate of the data stream;
• analog filtering at least one respective substream at the respective sample rate greater than the respective symbol rate of the respective substream to produce a respective sub-channel signals;
• and
• combining respective sub-channel signals prior to transmission,
• wherein the filtering of the at least one respective substream provides pre-emphasis of the respective substream and attenuation outside of a respective band of frequencies corresponding to the respective sub-channel signals.

A method of transmitting data, comprising:

• receiving a plurality of substreams of a data stream, respective substreams corresponding to respective sub-channel signals, wherein each of the respective substreams has a respective symbol rate substantially less than a symbol rate of the data stream;
• analog filtering at least one respective substream to provide pre-emphasis of the respective sub-channel signal, attenuation of signals outside of a respective band of frequencies corresponding to the respective sub-channel signal and to generate a signal for reducing interference between two or more respective sub-channel signals, the pre-emphasis and attenuation operations in the analog filtering operating at respective sample rates greater than the respective symbol rate of the respective substream;
• and
• combining a plurality of respective sub-channel signals prior to transmission,

A computer readable medium containing data representing a circuit that includes:

• a data transmission circuit, comprising:
• an interface for receiving a data stream for transmission;
• a data steam splitter that splits the data stream to produce multiple substreams, each substream having a respective symbol rate that is lower than a symbol rate of the data stream;
• a plurality of parallel data preparation circuits, wherein each data preparation circuit prepares a respective substream for transmission and generates a respective sub-channel signal;
• wherein at least a first data preparation circuit of the plurality of parallel data preparation circuits includes a first analog filter for filtering a first substream, the first analog filter operating at a sample rate greater than the respective symbol rate of the first substream, the first analog filter providing pre-emphasis of the respective sub-channel signal and attenuation of signals outside of a respective band of frequencies corresponding to the respective sub-channel signal;
• and
• a combiner for combining the respective sub-channel signals to generate a data transmission signal.

A computer readable medium containing data representing a circuit that includes:

• a data transmission circuit, comprising:
• an interface for receiving a data stream for transmission;
• a data steam splitter that splits the data stream to produce multiple substreams, each substream having a respective symbol rate that is lower than a symbol rate of the data stream;
• a plurality of parallel data preparation circuits, wherein each data preparation circuit prepares a respective substream for transmission and generates a respective sub-channel signal;
• wherein at least a first data preparation circuit of the plurality of parallel data preparation circuits includes a first analog filter matrix, a first portion of the first analog filter matrix providing pre-emphasis of the respective sub-channel signal and attenuation of signals outside of a respective band of frequencies corresponding to the respective sub-channel signal, a second portion of the first analog filter matrix for producing a signal for reducing interference between two or more respective sub-channel signals, and wherein the first portion of the first analog filter matrix operates at a sample rate greater than the respective symbol rate of the first substream;
• and
• a combiner for combining the respective sub-channel signals to generate a data transmission signal.