Systems and methods for reducing signal distortion in wireless communication
System and methods are provided for reducing signal distortion in wireless communication. An example system includes: an up-converter configured to generate a radio frequency signal based at least in part on a baseband signal for wireless communication and an oscillation signal; an amplifier configured to amplify the radio frequency signal and generate a transmission signal, the transmission signal including a first counter-intermodulation component associated with the up-converter and a second counter-intermodulation associated with the amplifier; and a signal generator configured to output a distortion-cancellation signal to the up-converter to reduce signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
1. A system for reducing signal distortion in wireless communication, the system comprising:
an up-converter configured to generate a radio frequency signal based at least in part on a baseband signal for wireless communication and an oscillation signal;
an amplifier configured to amplify the radio frequency signal and generate a transmission signal, the transmission signal including a first counter-intermodulation component associated with the up-converter and a second counter-intermodulation associated with the amplifier, and
a signal generator configured to output a distortion-cancellation signal to the up-converter to reduce signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
2. The system of claim 1 , wherein the signal generator includes:
a digital baseband unit configured to generate an input signal; and
a digital-to-analog converter configured to convert the input signal to the distortion-cancellation signal.
3. The system of claim 2 , wherein:
the baseband signal corresponds to a baseband frequency;
the oscillation signal corresponds to an oscillation frequency; and
the distortion-cancellation signal corresponds to a cancellation frequency approximately equal to three times the baseband frequency.
4. The system of claim 1 , wherein the up-converter and the amplifier are further configured to generate an injected counter-intermodulation component in the transmission signal based at least in part on the distortion-cancellation signal.
5. The system of claim 4 , wherein
the baseband signal corresponds to a baseband frequency;
the oscillation signal corresponds to an oscillation frequency; and
the injected counter-intermodulation component corresponds to an injection frequency approximately equal to a sum of the oscillation frequency and three times the baseband frequency.
6. The system of claim 4 , wherein the signal distortion is associated with total counter-intermodulation determined by performing one or more vector addition operations on the injected counter-intermodulation component, the first counter-intermodulation component and the second counter-intermodulation signal.
7. The system of claim 1 , wherein:
the baseband signal corresponds to a baseband frequency;
the oscillation signal corresponds to an oscillation frequency; and
the first counter-intermodulation component corresponds to a first frequency approximately equal to a sum of the oscillation frequency and three times the baseband frequency.
8. The system of claim 1 , wherein:
the baseband signal corresponds to a baseband frequency;
the oscillation signal corresponds to an oscillation frequency; and
the second counter-intermodulation component corresponds to a second frequency approximately equal to a sum of the oscillation frequency and three times the baseband frequency.
9. The system of claim 1 , wherein the signal generator is further configured to adjust a phase of the distortion-cancellation signal to reduce the signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
10. The system of claim 1 , wherein the signal generator is further configured to adjust a magnitude of the distortion-cancellation signal to reduce the signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
11. The system of claim 1 , wherein the up-converter includes:
a baseband filter configured to filter the baseband signal; and
a mixer configured to multiply the baseband signal with the oscillation signal to generate the radio frequency signal.
12. The system of claim 11 , wherein:
the mixer is further configured to generate a distortion component in the radio frequency signal; and
the amplifier is further configured to generate the first counter-intermodulation component in the transmission signal based at least in part on the distortion component.
13. A system for reducing signal distortion in wireless communication, the system comprising:
an up-converter configured to generate a radio frequency signal based at least in part on a baseband signal for wireless communication and an oscillation signal; and
an amplifier configured to amplify the radio frequency signal and generate a transmission signal, the transmission signal including a first counter-intermodulation component associated with the up-converter and a second counter-intermodulation associated with the amplifier;
the up-converter being further configured to change the radio frequency signal to adjust the first counter-intermodulation component in the transmission signal to reduce signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
14. The system of claim 13 , wherein the up-converter includes:
a baseband filter configured to filter the baseband signal; and
a mixer configured to multiply the baseband signal with the oscillation signal to generate the radio frequency signal.
15. The system of claim 13 , wherein:
the up-converter is further configured to generate a distortion component in the radio frequency signal; and
the amplifier is further configured to generate the first counter-intermodulation component in the transmission signal based at least in part on the distortion component.
16. The system of claim 15 , wherein the up-converter is further configured to adjust a phase of the distortion component to reduce the signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
17. The system of claim 15 , wherein the up-converter is further configured to adjust a magnitude of the distortion component to reduce the signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
18. The system of claim 13 , wherein:
the baseband signal corresponds to a baseband frequency;
the oscillation signal corresponds to an oscillation frequency; and
the first counter-intermodulation component corresponds to a first frequency approximately equal to a sum of the oscillation frequency and three times the baseband frequency; and
the second counter-intermodulation component corresponds to a second frequency approximately equal to a sum of the oscillation frequency and three times the baseband frequency.
19. A method for reducing signal distortion in wireless communication, the method comprising:
generating a radio frequency signal based at least in part on a baseband signal for wireless communication and an oscillation signal;
amplifying the radio frequency signal;
generating a transmission signal, the transmission signal including a first counter-intermodulation component and a second counter-intermodulation; and
generating a distortion-cancellation signal to reduce signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
20. A method for reducing signal distortion in wireless communication, the method comprising:
generating a radio frequency signal based at least in part on a baseband signal for wireless communication and an oscillation signal;
amplifying the radio frequency signal;
generating a transmission signal, the transmission signal including a first counter-intermodulation component and a second counter-intermodulation; and
changing the radio frequency signal to adjust the first counter-intermodulation component in the transmission signal to reduce signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.