초록 ▼

A multi-carrier transmitter and methods thereof are provided. For example, a multi-carrier transmitter comprises a processor operable to receive a plurality of baseband signals. Each of the plurality of baseband signals correspond to a separate data communication. A modulator is in communication wit

A multi-carrier transmitter and methods thereof are provided. For example, a multi-carrier transmitter comprises a processor operable to receive a plurality of baseband signals. Each of the plurality of baseband signals correspond to a separate data communication. A modulator is in communication with the processor. A non-linear device is in communication with the modulator. The processor is further operable to combine the plurality of baseband signals to generate a composite baseband signal. The modulator is operable to modulate a carrier signal with the composite baseband signal to generate a multi-carrier signal. The multi-carrier signal is provided to an input of the non-linear device.

대표청구항 ▼

1. 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; anda non-linear

1. 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; anda 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. 2. The multi-carrier transmitter of claim 1, wherein the non-linear device comprises a power amplifier. 3. The multi-carrier transmitter of claim 1, wherein each of the plurality of digital baseband signals comprises I and Q components. 4. The multi-carrier transmitter of claim 1, wherein the digital composite baseband signal comprises an amplitude component and a phase component. 5. The multi-carrier transmitter of claim 4, wherein modulation of the carrier signal comprises polar modulation. 6. The multi-carrier transmitter of claim 1, wherein combination of the plurality of baseband signals comprises a cosine or sine function. 7. 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 respective radio frequency (“RF”) sub-signal of a plurality of RF sub-signals and representing a separate data communication from a different user;a pre-amplifier stage in communication with the processor; anda power amplifier in communication with the pre-amplifier stage;wherein the processor is further operable to combine the plurality of digital baseband signals to generate a digital composite baseband signal;wherein the pre-amplifier stage is operable to modulate a RF carrier signal as a function of the digital composite baseband signal to generate a digital multicarrier signal, the digital multi-carrier signal including the plurality of RF sub-signals, the RF 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 power amplifier is operable to amplify the digital multi-carrier signal and output an amplified digital multi-carrier signal. 8. The multi-carrier transmitter of claim 7, wherein the pre-amplifier stage is free of separate voltage controlled oscillators, mixers, or filters corresponding to each of the plurality of RF sub-signals, respectively. 9. The multi-carrier transmitter of claim 7, wherein the RF carrier signal comprises at most one RF carrier signal. 10. The multi-carrier transmitter of claim 7, wherein each of the plurality of digital baseband signals comprises I and Q components. 11. The multi-carrier transmitter of claim 10, further comprising: an analog-to-digital converter in communication with the processor, the analog-to-digital converter operable to convert the I and Q components into digital I and Q components. 12. The multi-carrier transmitter of claim 7, wherein the pre-amplifier stage comprises at most one voltage controlled oscillator, at most one mixer, or at most one RF filter associated with the composite baseband signal. 13. The multi-carrier transmitter of claim 7, wherein the digital composite baseband signal comprises an amplitude component and a phase component. 14. The multi-carrier transmitter of claim 13, wherein the modulation of the RF carrier signal comprises polar modulation, the polar modulation including modulation of the RF carrier signal with the phase component. 15. The multi-carrier transmitter of claim 14, wherein the pre-amplifier stage is further operable to process the amplitude component and output a processed amplitude component to a first input of the power amplifier, and wherein the pre-amplifier stage is further operable to output a modulated phase component to a second input of the power amplifier. 16. A method for generating a multi-carrier signal, the method comprising: receiving a plurality of baseband signals, each of the plurality of baseband signals corresponding to a separate data communication from a different user, and converting the plurality of baseband signals to a plurality of digital baseband signals;combining the plurality of digital baseband signals to generate a digital composite baseband signal; andmodulating a carrier signal with the digital composite baseband signal to generate a multi-carrier signal, the carrier signal having a center frequency;wherein the multi-carrier signal comprises a plurality of sub-signals corresponding to the plurality of digital baseband signals, respectively, at least one of the plurality of sub-signals corresponding to at least two of the plurality of digital baseband signals, each of the plurality of sub-signals spaced at different frequencies from the center frequency. 17. The method of claim 16, wherein combining the plurality of baseband signals comprises: identifying amplitude and phase components corresponding to each of the plurality of baseband signals, respectively, each of the respective amplitude and phase components associated with a frequency;spacing the respective frequencies from the center frequency;identifying composite baseband components based on the spacing; andgenerating the digital composite baseband signal as a function of the identified composite baseband components.