Patent ID: 7817743

Claim:
A data transmission circuit, comprising: an interface for receiving a data stream for transmission; a data stream 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 first and second data preparation circuits of the plurality of parallel data preparation circuits each comprise a first analog filter for filtering the respective substream, each first analog filter operating at a sample rate greater than the respective symbol rate of the respective substream, each 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, wherein the first analog filters of the first and second data preparation circuits are coupled to one another to reduce interference between the respective sub-channel signals of the first and second data preparation circuits; and a combiner for combining the respective sub-channel signals to generate a data transmission signal.