Signal reconstruction for non-linearly distorted signal

1. A method for wireless communication at a first wireless communication device, the method comprising:

receiving a data signal from a second wireless communication device, wherein the data signal is based on a first signal and comprises a non-linear distortion;

scaling the data signal to provide a scaled signal;

slicing the scaled signal to provide a sliced signal;

scaling the sliced signal to provide a scaled sliced signal;

applying a non-linear distortion function to the sliced signal to provide a second signal;

generating an estimate of a non-linear distortion component of the data signal based on the second signal and the scaled sliced signal; and

generating an estimate of the first signal based on the estimate of the non-linear distortion component.

2. The method of claim 1 , wherein the slicing the scaled signal comprises:

applying a fast Fourier transform to the scaled signal to provide a frequency domain signal;

slicing the frequency domain signal to provide a sliced frequency domain signal; and

applying an inverse fast Fourier transform to the sliced frequency domain signal to provide a time domain signal.

3. The method of claim 1 , wherein the generating the estimate of the non-linear distortion component comprises:

subtracting the scaled sliced signal from the second signal.

4. The method of claim 1 , further comprising:

performing an iterative process that includes the scaling the data signal, the slicing the scaled signal, the scaling the sliced signal, the applying the non-linear distortion function, and the generating the estimate of the non-linear distortion component.

5. The method of claim 4 , wherein the iterative process comprises a Bussgang decomposition algorithm.

6. The method of claim 4 , wherein the iterative process further comprises:

generating a corrected data signal based on the estimate of the non-linear distortion component;

scaling the corrected data signal to provide a scaled corrected data signal;

slicing the scaled corrected data signal to provide a second sliced signal;

scaling the second sliced signal to provide a second scaled sliced signal;

applying the non-linear distortion function to the second scaled sliced signal to provide a third signal;

generating a second estimate of the non-linear distortion component of the corrected data signal based on the third signal and the second scaled sliced signal; and

generating the estimate of the first signal based on the second estimate of the non-linear distortion component.

7. The method of claim 4 , wherein the iterative process further comprises:

iteratively estimating a threshold for the non-linear distortion function.

8. The method of claim 1 , wherein the applying the non-linear distortion function to the sliced signal comprises:

applying at least one parameter indicative of the non-linear distortion function to the sliced signal.

9. The method of claim 8 , further comprising:

receiving the at least one parameter indicative of the non-linear distortion function from the second wireless communication device.

10. The method of claim 8 , wherein:

the at least one parameter indicative of the non-linear distortion function comprises a clipping threshold; and

the method further comprises estimating the clipping threshold from the data signal.

11. The method of claim 10 , wherein the estimating the clipping threshold from the data signal comprises:

estimating the clipping threshold based on a maximum amplitude of the data signal.

12. The method of claim 10 , wherein the estimating the clipping threshold from the data signal comprises:

applying equalization to the data signal to provide an equalized signal;

applying an inverse fast Fourier transform to the equalized signal to provide a time domain signal;

measuring a maximum amplitude of the time domain signal; and

estimating the clipping threshold based on the maximum amplitude.

13. The method of claim 10 , wherein the estimating the clipping threshold from the data signal comprises:

estimating the clipping threshold based on an average maximum amplitude of the data signal or based on a histogram of maximum amplitudes of the data signal.

14. The method of claim 8 , further comprising:

selecting the at least one parameter indicative of the non-linear distortion function based on a standard-specified adjusted channel leakage ratio (ACLR) or a standard-specified error vector magnitude (EVM).

15. The method of claim 8 , further comprising:

receiving an indication from the second wireless communication device, wherein the indication specifies an adjusted channel leakage ratio (ACLR), an error vector magnitude (EVM), or a peak-to-average power ratio (PAPR); and

selecting the at least one parameter indicative of the non-linear distortion function based on the ACLR, the EVM, or the PAPR.

16. The method of claim 8 , further comprising:

receiving an indication from the second wireless communication device, wherein the indication specifies a peak-to-average power ratio (PAPR); and

selecting the at least one parameter indicative of the non-linear distortion function based on the PAPR.

17. The method of claim 1 , further comprising:

determining that use of a dynamic adjusted channel leakage ratio (ACLR) or a dynamic error vector magnitude (EVM) is enabled;

selecting an ACLR or an EVM after the determining that use of the dynamic ACLR or the dynamic EVM is enabled;

transmitting the ACLR or the EVM to the second wireless communication device; and

receiving at least one parameter indicative of the non-linear distortion function based on the ACLR or the EVM from the second wireless communication device.

18. The method of claim 1 , further comprising:

determining that use of a dynamic adjusted channel leakage ratio (ACLR) is enabled; and

selecting an ACLR based on a first frequency allocation for the second wireless communication device and a second frequency allocation adjacent the first frequency allocation, or selecting the ACLR based on a first frequency allocation for the second wireless communication device and an absence of a frequency allocation adjacent the first frequency allocation, or selecting the ACLR based on a modulation scheme configured for a third wireless communication device that is scheduled on a first frequency allocation that is adjacent a second frequency allocation for the second wireless communication device.

19. The method of claim 1 , wherein:

the non-linear distortion is due to clipping of the first signal; and

the applying the non-linear distortion function to the sliced signal comprises clipping the sliced signal.

20. The method of claim 1 , wherein the scaling comprises Bussgang scaling that uses a Bussgang coefficient.

21. A first wireless communication device, comprising:

a transceiver;

a memory; and

a processor coupled to the transceiver and the memory, wherein the processor and the memory are configured to:

receive a data signal from a second wireless communication device via the transceiver, wherein the data signal is based on a first signal and comprises a non-linear distortion;

scale the data signal to provide a scaled signal;

slice the scaled signal to provide a sliced signal;

scale the sliced signal to provide a scaled sliced signal;

apply a non-linear distortion function to the sliced signal to provide a second signal;

generate an estimate of a non-linear distortion component of the data signal based on the second signal and the scaled sliced signal; and

generate an estimate of the first signal based on the estimate of the non-linear distortion component.

22. A method for wireless communication at a first wireless communication device, the method comprising:

transmitting at least one parameter to a second wireless communication device for a non-linear distortion function of a signal reconstruction operation to be performed by the second wireless communication device on a non-linearly distorted data signal, wherein the at least one parameter is based on an adjusted channel leakage ratio (ACLR), an error vector magnitude (EVM), or a peak-to-average power ratio (PAPR);

generating the non-linearly distorted data signal based on a first signal and the at least one parameter; and

transmitting the non-linearly distorted data signal to the second wireless communication device.

23. The method of claim 22 , further comprising:

determining a channel condition between the first wireless communication device and the second wireless communication device; and

determining that the channel condition meets a threshold condition,

wherein the transmitting the at least one parameter to the second wireless communication device is responsive to the determining that the channel condition meets the threshold condition.

24. The method of claim 22 , further comprising:

determining a signal-to-noise ratio (SNR) between the first wireless communication device and the second wireless communication device; and

determining that the SNR is less than or equal to an SNR threshold,

wherein the transmitting the at least one parameter to the second wireless communication device is responsive to the determining that the SNR is less than or equal to the SNR threshold.

25. The method of claim 22 , wherein the generating the non-linearly distorted data signal based on a first signal comprises:

applying a clipping threshold to the first signal.

26. The method of claim 25 , wherein the transmitting the at least one parameter to the second wireless communication device comprises:

transmitting the clipping threshold to the second wireless communication device.

27. The method of claim 22 , further comprising:

receiving an indication from the second wireless communication device, wherein the indication specifies the ACLR, the EVM, or the PAPR; and

selecting a clipping threshold for clipping the first signal based on the ACLR, the EVM, or the PAPR.

28. The method of claim 27 , wherein the transmitting the at least one parameter to the second wireless communication device comprises:

transmitting the clipping threshold to the second wireless communication device.

29. The method of claim 22 , further comprising:

receiving information for determining a parameter for the non-linear distortion function;

determining the parameter for the non-linear distortion function based on the information; and

using the non-linear distortion function to generate the non-linearly distorted data signal.

30. A first wireless communication device, comprising:

a transceiver;

a memory; and

a processor coupled to the transceiver and the memory, wherein the processor and the memory are configured to:

transmit at least one parameter to a second wireless communication device via the transceiver, wherein the at least one parameter is for a non-linear distortion function of a signal reconstruction operation to be performed by the second wireless communication device on a non-linearly distorted data signal, and wherein the at least one parameter is based on an adjusted channel leakage ratio (ACLR), an error vector magnitude (EVM), or a peak-to-average power ratio (PAPR);

generate the non-linearly distorted data signal based on a first signal and the at least one parameter; and

transmit the non-linearly distorted data signal to the second wireless communication device via the transceiver.