Abstract:
L'invention se rapporte à un appareil de compensation de la rotation de phase () dans la boucle de contre-réaction d'un amplificateur de puissance (PA) à contre-réaction cartésienne dans un étage émetteur final. Cet appareil comporte des éléments (18, 20, 22) permettant la modulation en quadrature d'un signal de différence complexe entre un signal d'entrée complexe (I,Q) et le signal de réaction complexe correspondant (IF, QF) à l'aide d'un signal de modulation complexe pour former un premier signal estimé, réel, effectif (IFE), et des éléments (22, 32, 34) permettant la modulation en quadrature du signal de sortie (IFF) provenant de l'amplificateur de puissance (PA) à l'aide d'un signal de démodulation complexe pour former le signal de réaction complexe (IF, QF). Des éléments (36) sont prévus pour détecter le décalage de phase entre le premier signal (IFE) et le second signal (IFF) et entre la composante de quadrature du premier signal (IFE) et du second signal (IFF) afin de déterminer la rotation de phase () de la boucle de contre-réaction. Des éléments (38) sont d'autre part prévus pour la rotation en phase du signal de modulation complexe avec une rotation en phase de compensation définie par la rotation en phase () déterminée.
Abstract:
Un émetteur (100) doté d'une entrée (102) en phase destinée à recevoir un signal d'entrée de bande en phase, ainsi que d'une entrée (112) en quadrature destinée à recevoir un signal d'entrée de bande de base en quadrature, comprend un modulateur (130), couplé aux entrées en phase et en quadrature, destinées à moduler les signaux de bandes de base en phase et en quadrature, afin de produire un signal de haute fréquence modulée, ainsi qu'un amplificateur (135) linéaire, couplé au modulateur, destiné à amplifier le signal de haute fréquence modulé afin de produire un signal de sortie. Un détecteur d'oscillations est couplé pour recevoir le signal de sortie, afin de détecter des oscillations, et afin de produire un signal d'erreur résultant des oscillations. Ledit émetteur comprend également un circuit (grilles de transmission 124, 126, 127, et 128) destiné à réduire le gain en boucle ouverte de la boucle de réaction, disposé entre les entrées en phase et en quadrature et ledit modulateur, le circuit de réduction de gain en boucle ouverte réduit le gain en boucle ouverte de l'émetteur à une valeur inférieure à un, en réponse au signal d'erreur.
Abstract:
According to at least one aspect, a communication system is provided. The communication system includes a power amplifier configured to amplify an input signal to generate an amplified output signal and provide the amplified output signal to an antenna, a power supply coupled to the power amplifier and configured to provide power to the power amplifier based on a power supply control signal, and a controller coupled to the power supply. The controller is configured to identify a target transmit power level for transmission of a wireless signal, generate the power supply control signal based on the target transmit power level using information indicative of a relationship between the target transmit power level and a setting of the power supply, generate performance information indicative of a characteristic of the communication system when the wireless signal is transmitted, and update the information indicative of the relationship using the performance information.
Abstract:
One of the embodiments of the present disclosure relates to a method for adjusting peak power capability of a power amplifier circuitry. The power amplifier circuitry comprises at least one main amplifier path and at least one peak amplifier path and is configured to output a signal combining amplified signals from the at least one main amplifier path and the at least one peak amplifier path. The method comprises calculating a PAPR of an input signal of the power amplifier circuitry; determining at least one configuration parameter of the at least one peak amplifier path depending upon the calculated PAPR of the input signal; and configuring the at least one peak amplifier path based on the determined at least one configuration parameter, thereby adjusting the peak power capability of the power amplifier circuitry. The present disclosure also relates to corresponding apparatus and wireless communication devices.
Abstract:
One of the embodiments of the present disclosure relates to a method for adjusting peak power capability of a power amplifier circuitry. The power amplifier circuitry comprises at least one main amplifier path and at least one peak amplifier path and is configured to output a signal combining amplified signals from the at least one main amplifier path and the at least one peak amplifier path. The method comprises calculating a PAPR of an input signal of the power amplifier circuitry; determining at least one configuration parameter of the at least one peak amplifier path depending upon the calculated PAPR of the input signal; and configuring the at least one peak amplifier path based on the determined at least one configuration parameter, thereby adjusting the peak power capability of the power amplifier circuitry. The present disclosure also relates to corresponding apparatus and wireless communication devices.
Abstract:
A method for linearizing a non-linear system element includes acquiring data representing inputs and corresponding outputs of the non-linear system element. A model parameter estimation procedure is applied to the acquired data to determine model parameters of a model characterizing input-output characteristics of the non-linear element. An input signal representing a desired output signal of the non-linear element is accepted and processed to form a modified input signal according to the determined model parameters. The processing includes, for each of a series of successive samples of the input signal, applying an iterative procedure to determining a sample of the modified input signal according to a predicted output of the model of the non-linear element. The modified input signal is provided for application to the input of the non-linear element.
Abstract:
Systems and methods are provided for adaptive linearization of an amplifier system having a plurality of heterogeneous amplifier paths. An amplifier system includes a plurality of amplifier paths, each configured to provide an amplified output signal from an input signal, and a signal combiner configured to combine the amplified output signals from the plurality of amplifier paths to provide a system output, such that the system output is a non-linear function of the amplified output signals. A monitoring system is configured to sample the system output and normalize the sampled output to a signal level associated with the input signal. A signal processing component is configured to characterize the amplifier paths via an iterative adaptive linearization process, such that the system output is linear with respect to the input signal.