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1. (WO2019045867) METHOD AND APPARATUS WITH COMMON DIGITAL PRE-DISTORTION COMPONENT FOR MULTIPLE TRANSMIT CHAINS
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CLAIMS

1. An apparatus for wireless communications, comprising:

a processing system configured to:

configure a set of power amplifiers of a set of transmit chains such that each power amplifier is to be operated with a common amount of backoff to amplify a transmit signal; and

generate a predistorted signal for the set of transmit chains based on the common amount of backoff; and

an interface configured to output the predistorted signal to the set of transmit chains for transmission of the transmit signal.

2. The apparatus of claim 1, wherein the processing system is configured to:

determine a set of bias voltages for the set of power amplifiers such that each power amplifier is operable with the common amount of backoff; and

cause the set of bias voltages to be applied to the set of power amplifiers, respectively.

3. The apparatus of claim 2, wherein the processing system is configured to select a directivity for transmission of the transmit signal based on a direction towards a device expected to receive the transmit signal; and determine the set of bias voltages based on the selected directivity for transmission of the transmit signal.

4. The apparatus of claim 3, wherein the processing system is further configured to configure a set of gains of a set preamplifiers in the set of transmit chains based on the selected directivity.

5. The apparatus of claim 1, wherein the processing system is configured to:

select a directivity for transmission of the transmit signal;

determine a set of output signal powers for the set of transmit chains to achieve the selected directivity for transmission of the transmit signal;

determine a set of bias voltages for the set of power amplifiers based on the set of output signal powers and the common amount of backoff; and

cause the set of bias voltages to be applied to the set of power amplifiers.

6. The apparatus of claim 1 , wherein the processing system is configured to:

determine a set of predistortion coefficients based on the common amount of backoff; and

generate the predistorted signal based on the set of predistortion coefficients.

7. The apparatus of claim 6, wherein the processing system is configured to select a directivity for transmission of the transmit signal and wherein determining the set of predistortion coefficients is based on the selected directivity for transmission of the transmit signal.

8. A method for wireless communications, comprising:

configuring a set of power amplifiers of a set of transmit chains such that each power amplifier is to be operated with a common amount of backoff to amplify a transmit signal;

generating a predistorted signal for the set of transmit chains based on the common amount of backoff; and

outputting the predistorted signal to the set of transmit chains for transmission of the transmit signal.

9. The method of claim 8, wherein configuring the set of power amplifiers comprises:

determining a set of bias voltages for the set of power amplifiers such that each power amplifier is configured to be operated with the common amount of backoff; and applying the set of bias voltages to the set of power amplifiers, respectively.

10. The method of claim 9, further comprising selecting a directivity for transmission of the transmit signal based on a direction towards a device expected to receive the transmit signal; and wherein determining the set of bias voltages is based on the selected directivity.

11. The method of claim 10, further comprising configuring a set of gains of a set preamplifiers in the set of transmit chains based on the selected directivity.

12. The method of claim 8, wherein configuring the set of power amplifiers comprises:

selecting a directivity for transmission of the transmit signal;

determining a set of output signal powers for the set of transmit chains to achieve a selected directivity for transmission of the transmit signal;

determining a set of bias voltages for the set of power amplifiers based on the set of output signal powers and the common amount of backoff; and

applying the set of bias voltages to the set of power amplifiers.

13. The method of claim 8, wherein generating the predistorted signal comprises: determining a set of predistortion coefficients based on the common amount of backoff; and

generating the predistorted signal based on the set of predistortion coefficients.

14. The method of claim 13, further comprising selecting a directivity for transmission of the transmit signal and wherein determining the set of predistortion coefficients is based on the selected directivity for transmission of the transmit signal.

15. An apparatus for wireless communications, comprising:

means for configuring a set of power amplifiers of a set of transmit chains such that each power amplifier is to be operated with a common amount of backoff to amplify a transmit signal;

means for generating a predistorted signal for the set of transmit chains based on the common amount of backoff; and

means for outputting the predistorted signal to the set of transmit chains for transmission of the transmit signal.

16. The apparatus of claim 15, wherein the means for configuring the set of power amplifiers comprises:

means for determining a set of bias voltages for the set of power amplifiers such that each power amplifier is configured to be operated with the common amount of backoff; and

means for applying the set of bias voltages to the set of power amplifiers.

17. The apparatus of claim 16, further comprising means for selecting a directivity for transmission of the transmit signal based on a direction towards a device expected to receive the transmit signal, and wherein the means for determining the set of bias voltages comprises means for determining the set of bias voltages based on the selected directivity for transmission of the transmit signal.

18. The apparatus of claim 17, further comprising means for configuring a set of gains of a set preamplifiers in the set of transmit chains based on the selected directivity.

19. The apparatus of claim 15, wherein the means for configuring the set of power amplifiers comprises:

means for selecting a directivity for transmission of the transmit signal;

means for determining a set of output signal powers for the set of transmit chains to achieve the selected directivity for transmission of the transmit signal;

means for determining a set of bias voltages for the set of power amplifiers based on the set of output signal powers and the common amount of backoff, respectively; and means for applying the set of bias voltages to the set of power amplifiers, respectively.

20. The apparatus of claim 15, wherein the means for generating the predistorted signal comprises:

means for determining a set of predistortion coefficients based on the common amount of backoff; and

means for generating the predistorted signal based on the set of predistortion coefficients.

21. The apparatus of claim 20, further comprising means for selecting a directivity for transmission of the transmit signal, wherein the means for determining the set of

predistortion coefficients comprises means for determining the set of predistortion coefficients based on the selected directivity for transmission of the transmit signal.

22. A computer readable medium comprising instructions for:

configuring a set of power amplifiers of a set of transmit chains such that each power amplifier is to be operated with a common amount of backoff to amplify a transmit signal;

generating a predistorted signal for the set of transmit chains based on the common amount of backoff; and

outputting the predistorted signal to the set of transmit chains for transmission of the transmit signal.

23. A wireless node, comprising:

a transmitter including a set of transmit chains having a set of power amplifiers, respectively; and

a processing system configured to:

configure the set of power amplifiers of the set of transmit chains such that each power amplifier is to be operated with a common amount of backoff to amplify a transmit signal; and

generate a predistorted signal for the set of transmit chains based on the common amount of backoff;

wherein the transmitter is configured to:

generate the transmit signal based on the predistorted signal; and transmit the transmit signal.

24. The wireless node of claim 23, wherein each of the set of transmit chains is configured to generate the transmit signal based on the predistorted signal.

25. The wireless node of claim 23, wherein each of the set of transmit chains comprises:

an upconverter configured to frequency upconvert the predistorted signal to generate an upconverted radio-frequency (RF) signal; and

a phase shifter configured to shift a phase of the upconverted RF signal to generate the transmit signal.

26. The wireless node of claim 23, wherein the transmitter includes a digital-to-analog converter (DAC) configured to convert the predistorted signal from a digital format to an analog format to generate the transmit signal.