Patent ID: 8155237

Claim:
A multi-carrier transmitter, comprising: a processor operable to receive a plurality of digital baseband signals, each of the plurality of digital baseband signals corresponding to a separate data communication from a different user; a modulator in communication with the processor; and a non-linear device in communication with the modulator; wherein the processor is further operable to combine the plurality of digital baseband signals to generate a digital composite baseband signal; wherein the modulator is operable to modulate a digital carrier signal with the digital composite baseband signal to generate a digital multi-carrier signal, the digital carrier signal having a center frequency; wherein the digital multi-carrier signal comprises a plurality of signals corresponding to the plurality of digital baseband signals, respectively, at least one of the plurality of signals corresponding to at least two of the plurality of digital baseband signals, each of the plurality of signals spaced at different frequencies from the center frequency; wherein the digital multi-carrier signal is provided to an input of the non-linear device.