Predistortion linearizer and method thereof
AssigneeLG Electronics Inc.
InventorKwang-Eun Ahn
Life of this patent
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Abstract
A predistortion linearizer may include a digital signal processor (DSP) for modeling a nonlinear characteristic of a high power amplifier (HPA) on a real time basis; a distortion signal generator for generating a distortion signal by using the signal modeled by the DSP; and a main path unit for combining the output signal of the HPA and the distortion signal of the distortion signal generator and transmitting an input signal without a distortion component. Since the nonlinear characteristic of the power amplifier is modeled on a real time basis to remove the distortion component contained in the output signal of the power amplifier, the nonlinear characteristic of the power amplifier is improved, and thus, an efficiency of the power amplifier can be maximized.
Claims21
A predistortion linearizer comprising:
- a digital signal processor (DSP) for modeling a nonlinear characteristic of a high power amplifier (HPA) on a real time basis, the DSP receiving an output signal of the HPA and an output signal of a predistorter, the DSP outputting a signal modeled by the DSP;
- a distortion signal generator for generating a distortion signal by using the signal modeled by the DSP;
- and
- a main path unit for combining the output signal of the HPA and the distortion signal of the distortion signal generator and transmitting a signal without a distortion component, the main path unit including the predistorter to receive an input signal, the HPA and a combiner, the combiner combining the output signal of the HPA and the distortion signal of the distortion signal generator.
A predistortion linearizing method comprising:
- converting a first input signal so as to have the opposite characteristic to that of a power amplifier;
- delaying the first input signal to become a delayed first input signal;
- amplifying the converted first input signal by a power amplifier;
- modeling a nonlinear characteristic of the power amplifier to produce a modeled signal by using a second input signal and the output signal of the power amplifier;
- generating a distortion signal based on the delayed first input signal and the modeled signal;
- and
- combining the output signal of the power amplifier and the distortion signal and transmitting a radio frequency signal without a distortion component.
A predistortion linearizer comprising:
- a main path unit including a predistorter, a digital/analog converter, a modulator, an amplifier, a combiner and a transmitter;
- a digital signal processor coupled to the main path unit to provide a modeling signal indicative of a characteristic of the amplifier based on an output signal of the predistorter and an output signal of the amplifier;
- and
- a distortion signal generator to generate a distortion signal based on the modeling signal, wherein the combiner combines the output signal of the amplifier and the distortion signal of the distortion signal generator prior to transmission by the transmitter;
- wherein the digital signal processor comprises:
- a first delay unit to delay the output signal of the predistorter,
- a demodulator to demodulate an output signal of the amplifier to an intermediate frequency signal,
- an analog/digital converter to convert tbe demodulated signal to a digital signal, and
- a signal modeling unit to model a non-linear characteristic of the amplifier on a real time basis by using the output signals of the analog/digital converter and the first delay unit.
A predistortion linearizer comprising:
- a main path unit including a predistorter, a digital/analog converter, a modulator, an amplifier, a combiner and a transmitter;
- a digital signal processor to provide a modeling signal indicative of a characteristic of the amplifier based on an output signal of the predistorter and an output signal of the amplifier;
- and
- a distortion signal generator to generate a distortion signal based on the modeling signal, the combiner to combine the output signal of the amplifier and the distortion signal of the distortion signal generator prior to transmission by the transmitter, wherein the distortion signal generator includes:
- a delay unit to delay an input signal,
- a signal distorter to generate the distortion signal based on the modeling signal of the digital signal processor and an output signal of the delay unit,
- a digital/analog converter to convert an output signal of the signal distorter to an analog signal,
- a modulator to modulate the converted analog signal to a radio frequency signal, and
- an error amplifier to amplify the modulated signal and output the amplified modulated signal to the main path unit.
Dependencies are inferred from the claim text.