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Crest factor reduction

A technology of crest factor and scaling factor, applied in the field of window CFR, which can solve problems such as affecting the efficiency and capacity of base stations, increasing system delay, etc.

Active Publication Date: 2017-04-19
XILINX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each processing stage is expensive and can significantly increase the latency of systems implementing CFR
In turn, this negatively impacts the efficiency and capacity of base stations implementing CFR

Method used

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  • Crest factor reduction
  • Crest factor reduction
  • Crest factor reduction

Examples

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Embodiment Construction

[0041] Various features are described herein with reference to the accompanying drawings. It should be noted that the figures may or may not be presented to scale and that elements of similar structure or function are represented by like reference numerals throughout the figures. It should be noted that the drawings are only used to aid in the description of the features. They should not be taken as an exhaustive description of the claimed invention, or as a limitation on the scope of the claimed invention. Furthermore, the illustrated features do not necessarily have all of the aspects or advantages described. An aspect or advantage described in connection with a particular feature is not necessarily limited to that particular feature, the aspect or advantage may be achieved in any other feature, even if this implementation is not shown or so explicitly described.

[0042] The methods and apparatus disclosed herein provide an efficient window crest factor suppression (CFR),...

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Abstract

A system (200) for crest factor reduction (CFR) includes a peak detector (205) configured to receive an input signal (xk); a running maximum filter (210) configured to generate a scaling factor based on a window gain (Gk) and a filter length, wherein the window gain (Gk) is based on the input signal (xk) and a threshold value (T); a window CFR gain filter (215) configured to generate a gain correction (Fk) based on the scaling factor and the filter length; a delay (225) configured to delay the input signal (xk) to generate a delayed input signal; a multiplier (230) configured to multiply the gain correction (Fk) by the delayed input signal to obtain a peak correction value; and an adder (235) configured to determine an output signal (yk) based on the peak correction value and the delayed input signal.

Description

technical field [0001] The present disclosure relates to crest factor suppression (CFR), and in particular, the present disclosure relates to windowed CFR. Background technique [0002] In some implementations of crest factor suppression (CFR), peaks in a signal may be determined. This can be accomplished by oversampling the signal, identifying signal amplitudes greater than two adjacent amplitudes, and then detecting to determine if any signal amplitudes exceed a predetermined threshold. If the signal is undersampled, the peaks may be incorrect and may deviate significantly from the true peak value. As the oversampling ratio decreases, the accuracy of peak estimation decreases accordingly. This drop in peak estimation accuracy directly affects the quality of the CFR method. In some examples, peak cancellation crest factor reduction (PCCFR) and windowed CFR (WCFR) require the position of the detected peak and the complex signal value at the detected peak. Therefore, accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2623H03F1/3258H03F3/24H04B1/0475H04B2201/70706
Inventor G·C·科普兰
Owner XILINX INC