US 2014/0191799 A1Published application

Predistorter and predistorter control method

AssigneeNtt Docomo, Inc.

InventorsJunya Ohkawara, Yasunori Suzuki, Shoichi Narahashi

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Abstract

In a predistorter that can compensate an intermodulation distortion component generated in a power amplifier even when employing carrier aggregation, a linear transmission path delays and transmits an input signal. Signal generation units generate individual carrier distortion signals for respective carriers included in an input signal to output an individual carrier distortion compensation signal. A sub-signal generation unit generates a carrier inter-modulation distortion signal from the input signal and the individual carrier distortion signal and outputs a carrier inter-modulation distortion compensation signal. A signal divider divides the input signal among the linear transmission path, the signal generation units, and the sub-signal generation unit. A signal combiner combines the individual carrier distortion compensation signal and the carrier inter-modulation distortion compensation signal to generate an output signal to an amplifier.

Claims15

Dependent claims

A predistorter that adds a distortion compensation signal to an input signal, the input signal including a plurality of carriers, so as to output the input signal to an amplifier;

comprising:
a linear transmission path that delays and transmits the input signal;
a plurality of signal generation units that generate an individual carrier distortion signal that is a distortion component, the distortion component being generated by the carriers, for each of the carriers included in the input signal and adjust the individual carrier distortion signal so as to output an individual carrier distortion compensation signal;
a sub signal generation unit that generates an inter-modulation distortion signal, the inter-modulation distortion signal being generated among the carriers, from the input signal and the individual carrier distortion signal, extracts each component of a frequency band that is same at least as the carriers as a carrier inter-modulation distortion signal from the inter-modulation distortion signal, and adjusts the carrier inter-modulation distortion signal so as to output a carrier inter-modulation distortion compensation signal;
a signal divider configured to divide the input signal among the linear transmission path, the plurality of signal generation units, and the sub signal generation unit;
a signal combiner that combines the individual carrier distortion compensation signal and the carrier inter-modulation distortion compensation signal to generate the distortion compensation signal and combines an input signal that is delayed by the linear transmission path and the distortion compensation signal so as to generate an output signal and output the output signal to the amplifier;
and
a control unit configured to control the plurality of signal generation units and the sub signal generation unit by using a feedback signal from the amplifier.

5 more elements

A predistorter that adds a distortion compensation signal to an input signal, the input signal including a plurality of carriers, so as to output the input signal to an amplifier;

comprising:
a linear transmission path that delays and transmits the input signal;
a plurality of signal generation units that extract a component of a frequency band that is same as a frequency band of the carriers from the input signal as an individual carrier input signal for each of the carriers included in the input signal, generates a distortion component of the individual carrier input signal as an individual carrier distortion signal, adjust the individual carrier distortion signal so as to generate an individual carrier distortion compensation signal, and output the individual carrier input signal and the individual carrier distortion compensation signal;
a sub signal generation unit that calculates a distortion component, the distortion component including a frequency band that is same as a frequency band of the carriers as a carrier inter-modulation distortion signal, among distortion components that are generated among the carriers from the individual carrier input signal, and adjusts the carrier inter-modulation distortion signal so as to output a carrier inter-modulation distortion compensation signal;
a signal divider configured to divide the input signal among the linear transmission path and the plurality of signal generation units;
a signal combiner that combines the individual carrier distortion compensation signal and the carrier inter-modulation distortion compensation signal to generate the distortion compensation signal and combines an input signal that is delayed by the linear transmission path and the distortion compensation signal so as to generate an output signal and output the output signal to the amplifier;
and
a control unit configured to control the plurality of signal generation units and the sub signal generation unit by using a feedback signal from the amplifier.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/127,760Filed 29 Nov 2012
Priority: JP 2011-2698829 Dec 2011
Published: 10 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H03F 1/3247
Using predistortion circuits: using feedback acting on predistortion circuits
H03F 1/3241
Modifications of amplifiers to reduce non-linear distortion: using predistortion circuits
H03F 3/19
High-frequency amplifiers, e.g. radio frequency amplifiers: with semiconductor devices only
H03F 3/245
Of transmitter output stages: with semiconductor devices only

Family

No related US applications are recorded in the indexed filing history.

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