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1. (WO2019048045) MODULATION À TRIPHASAGE POUR ÉMETTEUR RADIO EFFICACE ET À LARGE BANDE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1 . A method for power-amplification of a transmission signal, comprising:

obtaining the transmission signal with phase and amplitude modulation;

generating a power-amplified polar signal for approximating a power-amplified transmission signal by power-amplifying a first constant-envelope signal with one of two or more first amplification factors based on the transmission signal;

generating an outphasing pair of a first power-amplified outphasing signal and a second power-amplified outphasing signal based on the transmission signal ; and

combining the power-amplified polar signal, the first power-amplified outphasing signal and the second power-amplified outphasing signal to provide the power-amplified transmission signal.

2. A method of claim 1 , wherein the generating the outphasing pair comprises:

modulating a phase of a second constant-envelope signal with an outphasing angle to provide a first outphasing signal;

modulating a phase of a third constant-envelope signal with a negative of the outphasing angle to provide a second outphasing signal; and

power-amplifying each of the first outphasing signal and the second outphasing signal with a second amplification factor to provide the outphasing pair.

3. A method of claim 2, wherein the generating the power-amplified polar signal comprises:

before applying said one of two or more first amplification factors, modulating a phase of the first constant-envelope signal with a polar angle to provide a polar signal, and

the generating the outphasing pair further comprises:

modulating the phase of the second constant-envelope signal also with the polar angle; and

modulating the phase of the third constant-envelope signal also with the polar angle.

4. A method according to any preceding claim, wherein the two or more first amplification factors correspond to two or more pre-defined amplitude levels of the transmission signal which correspond to two or more pre-defined amplitude levels of the power-amplified transmission signal, and wherein said one of the two or more first amplification factors is selected such that a corresponding pre-defined amplitude level of the transmission signal approximates the amplitude of the transmission signal.

5. A method of claim 4, wherein the second amplification factor is defined such that an amplitude of a combined power-amplified outphasing signal is always equal to or smaller than a separation between any two adjacent predefined amplitude levels of the power-amplified transmission signal, and wherein the combined power-amplified outphasing signal is a combination of the first power-amplified outphasing signal and the second power-amplified out-phasing signal.

6. A method of claim 5, wherein the outphasing angle is selected such that an amplitude of a combination of the first outphasing signal and the second outphasing signal is equal to a difference between the amplitude of the transmission signal and a selected pre-defined amplitude level of the transmission signal corresponding to said one of two or more first amplification factors to enable fine amplitude resolution between pre-defined amplitude levels.

7. A method according to any preceding claim, wherein the power-amplified transmission signal when normalized is defined by equation:

= (2 ATP (f S0 (t + SiCt) + 52(t)),

wherein Amax is the number of the pre-defined amplitude levels of the transmission signal, ATP t) is a non-negative integer representing a selected pre-defined amplitude level having a value from zero to Amax - 1, 50(t) is a first periodic signal with phase coct + 0(t) corresponding to the polar signal, S^t) is a second periodic signal with phase coct + 0(t) + 0(t) corresponding to the first outphasing signal, 52 (t) is a third periodic signal with phase <wct + 0(t) - 0 (t) corresponding to the second outphasing signal, ω0 is a carrier frequency, 0(t) is the polar angle and 0(t) is the outphasing angle.

8. A method of claim 7, wherein the first periodic signal, the second periodic signal and the third periodic signal are sinusoidal signals, square wave signals or any signals formed by a summation of sinusoidal signals.

9. A method of claim 7 or 8, wherein the non-negative integer representing the selected pre-defined amplitude level and the outphasing angle are defined according to equations:

ATP (t = ceiling(r(t)4max) - 1,

0(t) = arccos(r(t)4max - ATP t)),

wherein "ceiling" denotes a ceiling function and r(t) is a normalized envelope amplitude of the transmission signal.

1 0. A method according to any of claims 3 to 9, wherein the modulat-ing the phase of the first constant-envelope signal, the second constant-envelope signal and the third constant-envelope signal are performed, respectively, by a first digital linearly interpolating phase modulator, a second digital linearly interpolating phase modulator and a third digital linearly interpolating phase modulator.

1 1 . A method according to any of claims 3 to 1 0, further comprising: detecting an upcoming amplitude level transition of selected pre-defined amplitude levels;

solving a zero crossing of the polar signal ; and

synchronizing an amplitude transition of the polar signal with the up-coming amplitude level transition based on the zero crossing of the polar signal.

1 2. A method of claim 1 1 , wherein the detecting the zero crossings of the polar signal is performed by the first digital interpolating phase modulator and the synchronizing the amplitude transitions is performed by synchronization means.

1 3. A method of claim 1 1 or 1 2, further comprising:

in response to detecting a zero crossing of the polar signal implying an amplitude level transition of selected pre-defined amplitude levels, performing interpolation in the digital interpolating phase modulators in two stages to account for a ττ/2 phase jump resulting from the amplitude level transition, wherein the two stages comprise:

if an amplitude level is detected to increase in the amplitude level transition, interpolating phases of the first outphasing signal and the second out-phasing signal to be in-phase with the polar signal right before the amplitude level transition and in opposite phase with each other and in a ±ττ/2 phase offset with the polar signal right after the amplitude level transition ; and

if the amplitude level is detected to decrease in the amplitude level transition, interpolating phases of the first outphasing signal and the second out-phasing signal to be in opposite phase with each other and in a ±ττ/2 phase offset with the polar signal right before the amplitude level transition and in-phase with the polar signal right after the amplitude level transition.

14. The method of any preceding claim, wherein the power-amplifying the first constant-envelope signal, the second constant-envelope signal and the third constant-envelope signal are performed, respectively, by one or more first switched-mode power amplifiers selected from two or more switched-mode power amplifiers, a second switched-mode power amplifier and a third switched-mode power amplifier.

15. The method of any preceding claim, wherein the transmission signal comprises in-phase and quadrature components.

1 6. An apparatus, comprising:

a signal component separator unit configured to receive a transmission signal with phase and amplitude modulation and to output a polar angle, an outphasing angle, and discrete amplitude level information based on the received transmission signal ;

a first phase modulator configured to modulate a phase of a first con-stant-envelope signal with the polar angle to provide a polar signal;

a second phase modulator configured to modulate a phase of a second constant-envelope signal with the polar angle and the outphasing angle to provide a first outphasing signal;

a third phase modulator configured to modulate a phase of a third constant-envelope signal with the polar angle and a negative of the outphasing angle to provide a second outphasing signal;

two or more first power amplifiers configured to power-amplify the polar signal with one of two or more first amplification factors according to the discrete amplitude level information to provide a power-amplified polar signal, wherein said one of two or more first amplification factors are realized by selecting one or more of the two or more first power amplifiers to be active;

a second power amplifier configured to power-amplify the first out-phasing signal with a second amplification factor to provide a first power-amplified outphasing signal;

a third power amplifier configured to power-amplify the second out-phasing signal with the second amplification factor to provide a second power-amplified outphasing signal; and

one or more combiners configured to combine the power-amplified polar signal, the first power-amplified outphasing signal and the second power-amplified outphasing signal to provide a power-amplified transmission signal.

17. An apparatus of claim 1 6, wherein the first phase modulator is a digital interpolating phase modulator and is further configured to detect upcoming amplitude level transitions of selected pre-defined amplitude level and solve zero crossings of the polar signal, the apparatus further comprising:

synchronization means configured to synchronize amplitude transitions of the polar signal with amplitude level transitions defined by the selecting said one or more first power amplifiers to be active based on zero crossings of the polar signal.

18. An apparatus of claim 1 6 or 17, wherein the second phase mod-ulator and the third phase modulator are digital interpolating phase modulators and are further configured, in response to the first phase modulator detecting a zero crossing of the polar signal implying an amplitude level transition of selected pre-defined amplitude levels, to perform interpolation in two stages to account for a π/2 phase jump resulting from the amplitude level transition, wherein the two stages comprise:

in response to an amplitude level being detected by the first phase modulator to increase in the amplitude level transition, the second phase modulator and the third phase modulator are configured to interpolate phases of the first outphasing signal and the second outphasing signal to be in-phase with the polar signal right before the amplitude level transition and in opposite phase with each other and in a ±ττ/2 phase offset with the polar signal right after the amplitude level transition; and

in response to the amplitude level being detected by the first phase modulator to decrease in the amplitude level transition, the second phase mod-ulator and the third phase modulator are configured to interpolate phases of the first outphasing signal and the second outphasing signal to be in opposite phase with each other and in a ±π/2 phase offset with the polar signal right before the amplitude level transition and in-phase with the polar signal right after the amplitude level transition.

19. An apparatus, comprising means configuring the apparatus to carry out the method according to any of claims 1 to 15.

20. A computer program product embodied on a distribution medium readable by a computer and comprising program instructions which, when loaded into an apparatus, execute the method according to any preceding claim 1 to 15.

21 . An apparatus, comprising

a signal component separator unit configured to receive a transmission signal with phase and amplitude modulation;

a polar section configured to generate a power-amplified polar signal for approximating a power-amplified transmission signal by power-amplifying a first constant-envelope signal with one of two or more first amplification factors based on the transmission signal;

an outphasing section configured to generate an outphasing pair of a first power-amplified outphasing signal and a second power-amplified outphasing signal based on the transmission signal; and

a combiner configured to combine the power-amplified polar signal, the first power-amplified outphasing signal and the second power-amplified out-phasing signal to provide the power-amplified transmission signal.

22. An apparatus comprising:

obtaining means for obtaining the transmission signal with phase and amplitude modulation;

first generating means for generating a power-amplified polar signal for approximating a power-amplified transmission signal by power-amplifying a first constant-envelope signal with one of two or more first amplification factors based on the transmission signal;

second generating means for generating an outphasing pair of a first power-amplified outphasing signal and a second power-amplified outphasing signal based on the transmission signal; and

combining means for combining the power-amplified polar signal, the first power-amplified outphasing signal and the second power-amplified out-phasing signal to provide the power-amplified transmission signal.