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1. (WO2019043434) CORRECTION OF SPECIFIC INTERMODULATION PRODUCTS IN A CONCURRENT MULTI-BAND SYSTEM
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Claims

What is claimed is:

1 . A method of compensating for one or more specific Intermodulation Distortion, IMD, products in a concurrent multi-band transmitter system (10), comprising:

generating (100) an IMD correction signal for a specific IMD product as a function of two or more frequency band input signals for two or more frequency bands of a concurrent multi-band signal, the specific IMD product being an arbitrary order IMD product;

frequency translating (102) the IMD correction signal to a desired frequency that corresponds to a radio frequency location of the specific IMD product; and

after frequency translating (102) the IMD correction signal to the desired frequency, utilizing (104) the IMD correction signal to compensate for the specific IMD product.

2. The method of claim 1 wherein the specific IMD product is a non-simple odd-order IMD product.

3. The method of claim 1 wherein the specific IMD product is an even-order IMD product.

4. The method of any one of claims 1 to 3 wherein generating (100) the IMD correction signal for the specific IMD product comprises generating (100) the IMD correction signal for the specific IMD product in accordance with:

IMD_PRODUCT(n) = AB ,

where


,

Ci are signed integer values that define the specific IMD product, dt is a parameter that controls relative delay of the two or more frequency band input signals, is a parameter that controls relative delay of envelope signals for the two or more frequency band input signals, fij is an N-dimensional basis function set with M members that span a respective N-dimensional input space, φ} axe complex coefficients for each set member of the N-dimensional basis function set, and


5. The method of claim 4 wherein frequency translating (1 02) the IMD correction signal to the desired frequency that corresponds to the radio frequency location of the specific IMD product comprises frequency translating (102) the IMD correction signal to the desired frequency that corresponds to the radio frequency location of the specific IMD product in accordance with:

FREQ_TRANS_IMD_PRODUCT(n) =

where are digital frequency variables that define a frequency location of each frequency band and a weighted sum of defines the desired frequency to which the IMD correction signal is translated.

6. The method of any one of claims 1 to 3 wherein generating (100) the IMD correction signal for the specific IMD product comprises:

generating (100A) a plurality of component signals of the IMD correction signal for the specific IMD product, each component signal of the plurality of component signals being generated in accordance with:

IMD_PRODUCT_COMPONENT (n) = AB,

where


- dN) \}]

Ci are signed integer values that define the specific IMD product, d* is a parameter that controls relative delay of the two or more frequency band input signals, dt is a parameter that controls relative delay of envelope signals for the two or more frequency band input signals, fij is an N-dimensional basis function set with M members that span a respective N-dimensional input space, φ} axe complex coefficients for each set member of the N-dimensional basis function set,


and values of d* and d* are different for each component signal of the plurality of component signals; and

combining (100B) the plurality of component signals to provide the IMD correction signal for the specific IMD product.

7. The method of claim 6 wherein frequency translating (1 02) the IMD correction signal to the desired frequency that corresponds to the radio frequency location of the specific IMD product comprises frequency translating (102) the IMD correction signal to the desired frequency that corresponds to the radio frequency location of the specific IMD product in accordance with:

FREQ_TRANS_IMD_PRODUCT(n) in

where are digital frequency variables that define a frequency location of each frequency band and the weighted sum of defines the desired frequency to which the IMD correction signal is translated.

8. The method of any one of claims 1 to 7 wherein the desired frequency to which the IMD correction signal is translated is a baseband frequency that, after subsequent upconversion, results in the IMD correction signal being located at the radio frequency location of the specific IMD product.

9. The method of any one of claims 1 to 7 wherein the desired frequency to which the IMD correction signal is translated is an intermediate frequency that, after subsequent upconversion, results in the IMD correction signal being located at the radio frequency location of the specific IMD product.

10. The method of any one of claims 1 to 7 wherein the desired frequency to which the IMD correction signal is translated is the radio frequency location of the specific IMD product.

1 1 . The method of any one of claims 1 to 10 further comprising:

generating (104A), from the two or more frequency band input signals, two or more predistorted frequency band input signals, respectively, located at desired frequencies for the two or more predistorted frequency band input signals that correspond to radio frequency locations of carriers of the two or more frequency bands of the concurrent multi-band signal; and

combining (104B) the two or more predistorted frequency band input signals and the IMD correction signal to provide a combined signal.

12. The method of claim 1 1 further comprising upconverting (104C) the combined signal to provide the concurrent multi-band signal.

13. A concurrent multi-band transmitter system (10) for compensating for one or more specific Intermodulation Distortion, IMD, products in the concurrent multi-band transmitter system (10), comprising:

IMD digital predistortion circuitry (16) operable to generate an IMD correction signal for a specific IMD product as a function of two or more frequency band input signals for two or more frequency bands of a concurrent multi-band signal, the specific IMD product being an arbitrary IMD product; and tuning circuitry (20) operable to frequency translate the IMD correction signal to a desired frequency that corresponds to a radio frequency location of the specific IMD product; and

wherein the concurrent multi-band transmitter system (10) is operable to, after frequency translation of the IMD correction signal to the desired frequency, utilize the IMD correction signal to compensate for the specific IMD product.

14. The concurrent multi-band transmitter system (10) of claim 13 wherein the specific IMD product is a non-simple odd-order IMD product.

15. The concurrent multi-band transmitter system (10) of claim 13 wherein the specific IMD product is an even-order IMD product.

16. The concurrent multi-band transmitter system (10) of any one of claims 13 to 17 wherein the IMD digital predistortion circuitry (16) is operable to generate the IMD correction signal for the specific IMD product in accordance with:

IMD_PRODUCT(n) = AB,

where


Ci are signed integer values that define the specific IMD product, dt is a parameter that controls relative delay of the two or more frequency band input signals, ¾ is a parameter that controls relative delay of envelope signals for the two or more frequency band input signals, fij is an N-dimensional basis function set with M members that span a respective N-dimensional input space, φ} axe complex coefficients for each set member of the N-dimensional basis function set, and

Xi(n) for Ci ≥ 0,

Xi(n) =

- (n) for Ci < 0

17. The concurrent multi-band transmitter system (10) of claim 16 wherein the tuning circuitry (20) is operable to frequency translate the IMD correction signal to the desired frequency that corresponds to the radio frequency location of the specific IMD product in accordance with:

FREQ_TRANS_IMD_PRODUCT(n) = ABe^c^+c^+→c^^n,

where are digital frequency variables that define a frequency location of each frequency band and a weighted sum of c^t defines the desired frequency to which the IMD correction signal is translated.

18. The concurrent multi-band transmitter system (10) of any one of claims 13 to 15 wherein in order to generate the IMD correction signal for the specific IMD product, the IMD digital predistortion circuitry (16) is operable to:

generate a plurality of component signals of the IMD correction signal for the specific IMD product, each component signal of the plurality of component signals being generated in accordance with:

IMD_PRODUCT_COMPONENT (n) = AB,

where


- dN) \}],

Ci are signed integer values that define the specific IMD product, d* is a parameter that controls relative delay of the two or more frequency band input signals, d* is a parameter that controls relative delay of envelope signals for the two or more frequency band input signals, β} is an N-dimensional basis function set with M members that span a respective N-dimensional input space, φ} axe complex coefficients for each set member of the N-dimensional basis function set,


and values of dt and dj are different for each component signal of the plurality of component signals; and

combine the plurality of component signals to provide the IMD correction signal for the specific IMD product.

19. The concurrent multi-band transmitter system (10) of claim 18 wherein the tuning circuitry (20) is operable to frequency translate the IMD correction signal to the desired frequency that corresponds to the radio frequency location of the specific IMD product in accordance with:

FREQ_TRANS_IMD_PRODUCT(n) = ABe^c^+c^+→c^ n,

where are digital frequency variables that define a frequency location of each frequency band and the weighted sum of defines the desired frequency to which the IMD correction signal is translated.

20. The concurrent multi-band transmitter system (10) of any one of claims 13 to 19 wherein the desired frequency to which the IMD correction signal is translated is a baseband frequency that, after subsequent upconversion, results in the IMD correction signal being located at the radio frequency location of the specific IMD product.

21 . The concurrent multi-band transmitter system (10) of any one of claims 13 to 19 wherein the desired frequency to which the IMD correction signal is translated is an intermediate frequency that, after subsequent upconversion, results in the IMD correction signal being located at the radio frequency location of the specific IMD product.

22. The concurrent multi-band transmitter system (10) of any one of claims 13 to 19 wherein the desired frequency to which the IMD correction signal is translated is the radio frequency location of the specific IMD product.

23. The concurrent multi-band transmitter system (10) of any one of claims 13 to 22 further comprising:

digital predistortion circuitry (14) operable to generate, from the two or more frequency band input signals, two or more predistorted frequency band input signals, respectively, located at desired frequencies for the two or more predistorted frequency band input signals that correspond to radio frequency locations of carriers of the two or more frequency bands of the concurrent multi-band signal; and

combining circuitry (24) operable to combine the two or more predistorted frequency band input signals and the IMD correction signal to provide a combined signal.

24. The concurrent multi-band transmitter system (10) of claim 23 further comprising upconversion circuitry (22) operable to upconvert the combined signal to provide the concurrent multi-band signal.

25. A concurrent multi-band transmitter system (10) for compensating for one or more specific Intermodulation Distortion, IMD, products in a concurrent multi-band transmitter system (10), the concurrent multi-band transmitter system (10) adapted to:

generate an IMD correction signal for a specific IMD product as a function of two or more frequency band input signals for two or more frequency bands of a concurrent multi-band signal, the IMD product being an arbitrary order IMD product;

frequency translate the IMD correction signal to a desired frequency that corresponds to a radio frequency location of the specific IMD product; and

after frequency translating the IMD correction signal to the desired frequency, utilize the IMD correction signal to compensate for the specific IMD product.

26. A concurrent multi-band transmitter system (10) for compensating for one or more specific Intermodulation Distortion, IMD, products in a concurrent multi-band transmitter system (10), comprising:

a generating module (48-1 ) operable to generate an IMD correction signal for a specific IMD product as a function of two or more frequency band input signals for two or more frequency bands of a concurrent multi-band signal, the IMD product being an arbitrary order IMD product;

a frequency translating module (48-2) operable to frequency translate the IMD correction signal to a desired frequency that corresponds to a radio frequency location of the specific IMD product; and

a utilizing module (48-3) operable to, after frequency translating the IMD correction signal to the desired frequency, utilize the IMD correction signal to compensate for the specific IMD product.