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Circuit and method for predistortion

A technology of pre-distortion and pre-distortion coefficients, applied in the direction of improving amplifiers to reduce nonlinear distortion, electrical components, components of amplifiers, etc., can solve problems such as slow convergence speed and poor numerical stability

Active Publication Date: 2018-03-09
SINO WEALTH ELECTRONICS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The digital predistortion technology based on ordinary digital polynomials, due to the disadvantage of high correlation among the columns of the matrix for solving the predistortion model parameters, leads to slow convergence speed and poor numerical stability

Method used

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  • Circuit and method for predistortion
  • Circuit and method for predistortion
  • Circuit and method for predistortion

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Embodiment Construction

[0017] Various aspects and examples of the invention will now be described. The following description provides specific details to provide a thorough understanding and to facilitate description of these examples. However, it will be understood by those skilled in the art that the present invention may be practiced without many of these details. Also, some well-known structures or functions may not be shown or described in detail to avoid unnecessarily obscuring the related description.

[0018] figure 1 is a circuit diagram of a predistortion circuit 100 according to an embodiment of the present invention.

[0019] Such as figure 1 As shown, the predistortion circuit 100 includes a digital predistorter 102, a digital-to-analog (digital-to-analog) converter (DAC) 104, a power amplifier (PA) 106, an attenuator 108, an analog-to-digital (analog-to-digital) converter ( ADC) 110, timing synchronizer 112, statistics generator 114, quadrature basis function generator 116, and pre...

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Abstract

The invention discloses a circuit and method for predistortion. The circuit comprises a digital predistorter configured to modify an input baseband signal via a predistortion coefficient to generate amodified digital signal; a digital analog converter configured to convert the modified digital signal to generate an analog signal; a power amplifier configured to amplify the digital signal to generate an amplified signal; an attenuator configured to attenuate the amplified signal to generate an attenuated signal; an analog-digital converter configured to generate an attenuated digital signal; atiming synchronizer configured to synchronize the attenuated digital signal and the modified digital signal to generate synchronous amplified signals; a statistic generator configured to generate a probability density function of multiple samples of the input baseband signal; an orthogonal basis function generator configured to generate a group of normalized orthogonal basis functions; and a predistortion coefficient training circuit configured to generate updated predistortion coefficients.

Description

technical field [0001] The present invention relates to digital circuits, and more particularly, but not limited to, circuits and methods for predistortion. Background technique [0002] In a wireless communication system, a radio frequency power amplifier (PA) is one of the most important energy-consuming devices. Therefore, improving the efficiency of the power amplifier can effectively reduce the power consumption of the system. [0003] The power efficiency of a power amplifier is inversely related to its linearity. When the system works in the non-linear region of the power amplifier, it will cause in-band signal distortion and out-of-band spectrum expansion, which will further deteriorate the performance of the entire system. Furthermore, the modulation technique (such as Orthogonal Frequency Division Multiplexing (OFDM)) adopted by the communication system with higher spectral efficiency is more sensitive to the nonlinearity of the power amplifier. [0004] Effecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/20
CPCH03F1/3258H03F3/20H03F1/3247H03F3/24
Inventor 胡刚王雪鹏聂远飞
Owner SINO WEALTH ELECTRONICS
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