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Joint process estimator with variable tap delay line for use in power amplifier digital predistortion

A technology of pre-distortion and pre-distortion circuit, applied to power amplifiers, improved amplifiers to reduce nonlinear distortion, amplifiers, etc., can solve problems such as amplifier response nonlinearity

Active Publication Date: 2013-07-10
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the response of the amplifier at or near the saturation point is non-linear

Method used

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  • Joint process estimator with variable tap delay line for use in power amplifier digital predistortion
  • Joint process estimator with variable tap delay line for use in power amplifier digital predistortion
  • Joint process estimator with variable tap delay line for use in power amplifier digital predistortion

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Embodiment Construction

[0026] Referring now to the drawings, FIG. 1 illustrates a predistortion system 100 configured to compensate for distortion introduced by a power amplifier 120 to a communication signal. As mentioned above, power amplifiers are generally most efficient when operating in the non-linear range. However, the nonlinear response of power amplifiers causes unwanted out-of-band emissions and reduces spectral efficiency in communication systems. In system 100 of FIG. 1 , predistorter 110 is used to improve the efficiency and linearity of the power amplifier by "predistorting" the input signal to the power amplifier to compensate for non-linear distortion introduced by power amplifier 120 . The cascading of the predistorter 110 and the power amplifier 120 improves the linearity of the output signal even when the power amplifier 120 is operated at high efficiency.

[0027] While predistortion is used in the circuits and systems described herein to linearize the output of power amplifier...

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Abstract

Methods and circuits for pre-distorting a signal to compensate for distortion introduced by an electronic device operating on the signal. In an example method, first and second signal samples representing the input and output of the electronic device are generated. The first and second signal samples are spaced at unit-delay intervals, and each of the second signal samples corresponds in time to one of the first signal samples. Pre-distortion weights are then calculated from the first and second signal samples, the pre-distortion weights corresponding to a pre-distortion model comprising a lattice-predictor memory model structure having multiple delays and having at least one multi-unit delay interval between adjacent delays. The calculated pre-distortion weights are then applied to the input signal, using a predistorter with a structure corresponding to the lattice-predictor memory model, to produce a pre-distorted input signal for input to the electronic device.

Description

technical field [0001] The present invention relates generally to techniques for building physical models of nonlinear electronic devices, and more particularly to methods and apparatus for predistorting signals to compensate for distortions subsequently introduced to the signals by electronic devices. Background technique [0002] The design of RF power amplifiers for communication applications often involves a trade-off between linearity and efficiency. Power amplifiers are generally most efficient when operating at or near their saturation point. However, the response of an amplifier at or near its saturation point is non-linear. Generally speaking, when working in the high efficiency range, the response of the power amplifier presents nonlinear response and memory effect. [0003] One way to improve the efficiency of a power amplifier and its overall linearity is to digitally predistort the input to the power amplifier in order to compensate for the distortion introduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3247H03F1/3258H03F3/195H03F3/24H03F2201/3209
Inventor C.白S.基兰比B.勒曼
Owner TELEFON AB LM ERICSSON (PUBL)
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