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US 10,044,543 B2Granted
Reducing crest factors
AssigneeFuturewei Technologies, Inc.
InventorHuei Yuan Shih
Life of this patent
Estimating the term…
Abstract
The present disclosure describes methods, systems, and computer program products for a reducing crest factors. An input signal is received. The input signal includes a clipping signal that reduces a peak amplitude of a source signal based on a predetermined clipping level. The input signal is transposed to a plurality of transposed signals using a plurality of multipliers. A feedback signal is generated based on the plurality of transposed signals using a first plurality of delay taps. A windowing signal is generated based on the feedback signal. The windowing signal is used to reduce a crest factor of the source signal.
Claims20
A method for reducing crest factors, comprising:
- receiving an input signal;
- transposing, using a plurality of multipliers of a windowing signal generator with a folding structure including the plurality of multipliers, the input signal to a plurality of signals transposed without using delay taps;
- generating, using a first plurality of delay taps, a feedback signal based on the plurality of signals transposed without using delay taps, wherein the feedback signal comprises combination of at least one of the signals transposed without using delay taps and a delayed signal, the delayed signal is based on at least one of the plurality of the signals transposed without using delay taps;
- generating a windowing signal based on the feedback signal, wherein the windowing signal is used to reduce a crest factor of a source signal;
- generating an output signal based on the source signal and the windowing signal;
- and
- transmitting the output signal.
4 more elements
A transmitter, comprising:
- an amplitude calculator comprising one or more hardware circuit elements, or comprising combination of one or more hardware circuit elements and software, wherein the amplitude calculator is configured to calculate an amplitude of a source signal;
- a clipping signal generator comprising one or more hardware circuit elements, or comprising combination of one or more hardware circuit elements and software, wherein the clipping signal generator is configured to generate a clipping signal based on the amplitude of the source signal and a predetermined clipping level;
- a windowing signal generator using a folding structure, the windowing signal generator configured to:
- transpose, using a plurality of multipliers, the clipping signal to a plurality of signals transposed without using delay taps, the folding structure including the plurality of multipliers;
- generate, using a first plurality of delay taps, a feedback signal based on the plurality of signals transposed without using delay taps, wherein the feedback signal comprises combination of at least one of the signals transposed without using delay taps and a delayed signal, the delayed signal is based on at least one of the plurality of the signals transposed without using delay taps;
- generate a windowing signal based on the feedback signal, wherein the windowing signal is used to reduce a crest factor of the source signal;
- a multiplier that is configured to generate an output signal based on the source signal and the windowing signal;
- and
- an antenna configured to transmit the output signal.
6 more elements
A user device, comprising:
- an amplitude calculator comprising one or more hardware circuit elements, or comprising combination of one or more hardware circuit elements and software, wherein the amplitude calculator is configured to calculate an amplitude of a source signal;
- a clipping signal generator comprising one or more hardware circuit elements, or comprising combination of one or more hardware circuit elements and software, wherein the clipping signal generator is configured to generate a clipping signal based on the amplitude of the source signal and a predetermined clipping level;
- a windowing signal generator using a folding structure, the windowing signal generator configured to:
- transpose, using a plurality of multipliers, the clipping signal to a plurality of signals transposed without using a delay tap, the folding structure including the plurality of multipliers;
- generate, using a first plurality of delay taps, a feedback signal based on the plurality of signals transposed without using delay taps, wherein the feedback signal comprises combination of at least one of the signals transposed without using delay taps and a delayed signal, the delayed signal is based on at least one of the plurality of the signals transposed without using delay taps;
- and
- generate a windowing signal based on the feedback signal, wherein the windowing signal is used to reduce a crest factor of the source signal;
- a multiplier that is configured to generate an output signal based on the source signal and the windowing signal;
- and
- an antenna configured to transmit the output signal.
7 more elements
Dependencies are inferred from the claim text.