Patent ID: 7443918

Claim:
An apparatus for modulating and demodulating data on a communication medium in accordance with a proscribed band plan including frequency division multiplexed transmit and receive bands; and the apparatus comprising: a hybrid encoder for selecting for at least one relatively higher frequency transmit band, a spectrally compatible lower frequency gap in a transmit portion of the band plan; an inverse discrete Fourier transform module for performing a frequency-to-time transform of a lower frequency image of the selected transmit band concurrently with frequency-to-time transforms of any remaining non-selected transmit bands; a hybrid upconverter for upconverting all time domain resultants to generate both base band images as well as replications thereof with an amount of the interpolation required determined by a requirement that the transformed image of the selected transmit band overlap with the selected transmit band on the communication medium, and for filtering out the undesired images, either baseband or higher frequency replications thereof and passing remaining mix onto the communication medium.