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Dynamic Determination of Volterra Kernels for Digital Pre-Distortion

Active Publication Date: 2014-07-31
TEXAS INSTR INC
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  • Abstract
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Benefits of technology

The patent describes a way to improve the performance of power amplifiers by using a special algorithm that determines the best way to distort the signals based on the output power level, modulation scheme, and carrier configuration. This results in better quality signals and more efficient use of power.

Problems solved by technology

These factors significantly limit DPD performance.

Method used

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  • Dynamic Determination of Volterra Kernels for Digital Pre-Distortion
  • Dynamic Determination of Volterra Kernels for Digital Pre-Distortion
  • Dynamic Determination of Volterra Kernels for Digital Pre-Distortion

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Embodiment Construction

[0009]Distortion can be understood as a measure of the difference in shape between the input and output signals of a system. If the distortion does not generate additional signals at the output of the system, it is called linear distortion, and it can be reduced by using an equalizer. However, if the distortion is such that new signals (with new frequencies) appear at the output of the system, it is called non-linear distortion. This type of distortion is of concern because those additional signals may interfere with other communications systems.

[0010]Non-linear distortion was not much of a problem many years ago when communications systems utilized frequency modulation; this type of modulation does not introduce amplitude variations in the envelope of the signal being transmitted, for which power amplifiers could be operated in class-C, achieving high efficiencies.

[0011]Today's communication systems make use of spectrum-efficient modulations that have variable envelope. At the same...

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Abstract

A method of dynamically calculating and updating the Volterra kernels used by the Digital Pre Distortion engine based on output power, input signal bandwidth, multicarrier configuration, frequency response and power amplifier temperature. A dominant Volterra kernels searching DSP engine based on innovation bases with minimum RMS error selection is implemented to continuously update the Volterra kernels set used in DPD to model the power amplifier non linear behaviours.

Description

BACKGROUND OF THE INVENTION[0001]Digital pre-distortion (DPD) is a technology to increase efficiency in RF power amplifiers and suppress frequency re-growth generated by power amplifier non-linear effects. This technology has been widely used in modern cellular network base station for GSM, CDMA, WCDMA and LTE standards. In order to increase the power amplifier efficiency the requirements for the memory taps and non-linear polynomial order for Volterra kernels based digital pre-distortion become more and more complicated. The digital computations increase exponentially with the number of Volterra Kernels. The adaption converge time has been significantly increased. The 3G cellular networks require very fast DPD converge time to handle the dynamic changes of modulation schemes, PA output power levels and multicarrier configurations. The Volterra kernels are usually predetermined in the lab or in the manufacturing calibration stage, and usually there is a very large number to support ...

Claims

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Application Information

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IPC IPC(8): H04L27/36
CPCH04L27/368
Inventor ZHAO, HONGZHICHEN, XIAOHANZHAO, XINGBRUBAKER, DAVID L.
Owner TEXAS INSTR INC
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