Distortion cancellation using adaptive linearization
View Patent ↗A method of signal processing includes receiving a distorted signal comprising a distorted component and an undistorted component, the distorted component being at least in part attributed to an exogenous signal, and performing linearization, based at least in part on the distorted signal and information associated with the exogenous signal, to obtain a corrected signal that is substantially similar to the undistorted component. An adaptive distortion reduction system includes an input interface configured to receive a distorted signal comprising a distorted component and an undistorted component, the distorted component being at least in part attributed to an exogenous signal; and an adaptive distortion reduction module coupled to the input interface, configured to perform linearization based at least in part on the distorted signal and information associated with the exogenous signal, to obtain a corrected signal that is substantially similar to the undistorted component.
1. An adaptive distortion reduction system comprising:
an input interface configured to receive a distorted signal comprising a distorted component and an undistorted component, wherein the distorted component is at least in part attributed to an exogenous signal, and the exogenous signal is a signal that is different from the distorted signal that is received; and
an adaptive distortion reduction module coupled to the input interface, configured to:
obtain information associated with the exogenous signal; and
perform linearization based at least in part on the distorted signal and information associated with the exogenous signal, to obtain a corrected signal that is substantially similar to the undistorted component.
2. The system of claim 1 , wherein performing linearization includes adaptively generating a replica signal that is substantially similar to the distorted component.
3. The system of claim 1 , wherein the distorted component includes distortion attributed to the exogenous signal.
4. The system of claim 1 , wherein the distorted component further includes nonlinear distortion attributed to a receiver circuitry.
5. The system of claim 1 , wherein the information associated with the exogenous signal includes frequency information of the exogenous signal.
6. The system of claim 1 , wherein the information associated with the exogenous signal includes a sampled frequency of the exogenous signal.
7. The system of claim 6 , wherein the sampled frequency f′ Ex is determined according to f′ Ex =(f Ex ) Modulo (f s /2), wherein f EX corresponds frequency of the exogenous signal and f s corresponds to sampling rate of the distorted signal.
8. The system of claim 1 , wherein the exogenous signal includes a signal that is generated by a circuitry other than a receive circuitry.
9. The system of claim 1 , wherein the exogenous signal includes a signal that is associated with a clock signal.
10. The system of claim 1 , wherein the exogenous signal includes a signal that is associated with a power supply.
11. The system of claim 1 , wherein the exogenous signal includes a harmonic of a local oscillator signal.
12. The system of claim 1 , wherein the adaptive distortion reduction module includes a separation block configured to separate from the distorted signal a reference component and a target component.
13. The system of claim 12 , wherein the separation block includes a persistence filter configured to aggregate the distorted signal over a period of time and generate the reference component.
14. The system of claim 12 , wherein the adaptive distortion reduction module further includes an adaptive filter coupled to the separation block, configured to adaptively generate a replica distortion signal that is substantially similar to the distorted component.
15. A method of signal processing, comprising:
receiving a distorted signal comprising a distorted component and an undistorted component, wherein the distorted component is at least in part attributed to an exogenous signal, and the exogenous signal is a signal that is different from the distorted signal that is received;
obtaining information associated with the exogenous signal; and
performing linearization, based at least in part on the distorted signal and information associated with the exogenous signal, to obtain a corrected signal that is substantially similar to the undistorted component.
16. The method of claim 15 , wherein performing linearization includes adaptively generating a replica signal that is substantially similar to the distorted component.
17. The method of claim 15 , further comprising outputting the corrected signal.
18. The method of claim 15 , wherein the distorted component includes distortion attributed to the exogenous signal.
19. The method of claim 15 , wherein the distorted component further includes nonlinear distortion attributed to a receiver circuitry.
20. The method of claim 15 , wherein the information associated with the exogenous signal includes frequency information of the exogenous signal.
21. The method of claim 15 , wherein the information associated with the exogenous signal includes a sampled frequency of the exogenous signal.
22. The method of claim 21 , wherein the sampled frequency is determined according to f′ Ex =(f Ex ) Modulo (f s /2), wherein f Ex corresponds frequency of the exogenous signal and f s corresponds to sampling rate of the distorted signal.
23. The method of claim 15 , wherein the exogenous signal includes a signal that is generated by a circuitry other than a receive circuitry.
24. The method of claim 15 , wherein the exogenous signal includes a signal that is associated with a clock signal.
25. The method of claim 15 , wherein the exogenous signal includes a signal that is associated with a power supply.
26. The method of claim 15 , wherein the exogenous signal includes a harmonic of a local oscillator signal.
27. The method of claim 15 , wherein performing linearization includes separating from the distorted signal a reference component and a target component.
28. The method of claim 15 , wherein performing linearization includes aggregating the distorted signal over a period of time and generating the reference component.
29. A computer program product for signal processing, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions stored therein for:
receiving a distorted signal comprising a distorted component and an undistorted component, wherein the distorted component is at least in part attributed to an exogenous signal, and the exogenous signal is a signal that is different from the distorted signal that is received;
obtaining information associated with the exogenous signal; and
performing linearization, based at least in part on the distorted signal and information associated with the exogenous signal, to obtain a corrected signal that is substantially similar to the undistorted component.
30. A digital receiver system, comprising:
an interface configured to receive an analog signal;
a mixer configured to demodulate the analog signal to generate a demodulated signal;
an analog to digital converter configured to convert the demodulated signal to a digital signal, the digital signal comprising a distorted component and an undistorted component, wherein the distorted component is at least in part attributed to an exogenous signal, and the exogenous signal is a signal that is different from the distorted signal that is received; and
an adaptive distortion reduction module configured to:
obtain information associated with the exogenous signal; and
perform linearization, based at least in part on the digital signal and information associated with the exogenous signal, to obtain a corrected signal that is substantially similar to the undistorted component.
31. A method of signal processing, comprising:
receiving an analog signal;
demodulating the analog signal to generate a demodulated signal;
converting the demodulated signal to a digital signal, the digital signal comprising a distorted component and an undistorted component, wherein the distorted component is at least in part attributed to an exogenous signal, and the exogenous signal is a signal that is different from the distorted signal that is received;
obtaining information associated with the exogenous signal; and
performing linearization, based at least in part on the digital signal and information associated with the exogenous signal, a corrected signal that is substantially similar to the undistorted component.