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Amplifier apparatus and predistortion control method

一种放大器、预失真的技术，应用在改进放大器以减少非线性失真、放大装置的零部件、放大器等方向，能够解决预失真器性能不够理想等问题

Inactive Publication Date: 2011-04-20
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the performance of the predistorter using the current predistortion technology is not ideal

Method used

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  • Amplifier apparatus and predistortion control method
  • Amplifier apparatus and predistortion control method
  • Amplifier apparatus and predistortion control method

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0090] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0091] The present inventors conducted research on the memory effect in the course of carrying out the present invention. image 3 Schematically shows the performance of the memory effect in the time domain in the power amplifier. The horizontal axis is the voltage of the PA input signal, and the vertical axis is the voltage of the output signal. It can be seen from the figure that this curve is "very fat", that is, multiple input signal amplitudes (voltages) correspond to one output signal amplitude (voltage). This is because the current output value of PA is not only related to the current input value, but also related to the previous input value.

[0092] Figure 4 Schematically shows the performance of the memory effect in the frequency domain in the power amplifier. exist Figure 4 The middle vertical axis is the normalized power spectral den...

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PUM

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Abstract

The present invention relates to an amplifier apparatus and a predistortion control method. The amplifier apparatus comprises a predistortion unit, a predistortion control unit and an amplifier unit, wherein the predistortion control unit controls the predistortion unit according to the signal which is fed back from the amplifier unit. The predistortion method comprises: determining the power of the left sidelobe of the two sidelobes of the frequency spectrum of the signal which is fed back from the amplifier unit; determining the power of the right sidelobe of the two sidelobes of the frequency spectrum of the signal which is fed back from the amplifier unit; determining the cost function according to the power of the left sidelobe and the power of the right sidelobe; and controlling thepredistortion unit according to the cost function.

Description

technical field [0001] The invention relates to the linearization of digital pre-distortion of nonlinear devices, in particular, the invention relates to the linearization of power amplifiers with memory effect. Background technique [0002] The power amplifier (PA) is an important part of electronic equipment, it can realize the power amplification of the weak electrical signal to meet the needs of transmission and emission. Wherein, the energy used for amplification comes from a DC power supply, that is, the PA converts the DC energy into an AC signal, so that the power intensity of the AC signal meets the requirement. Here the ability of the PA to convert DC energy to AC energy is referred to as the efficiency of the PA. The power relationship between the input and output signals of a PA can be divided into a linear region, a nonlinear region, and a saturation region. [0003] The input signal is ideally amplified when the envelope of the input signal fluctuates only in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/20
CPCH03F3/24H03F1/3247H03F3/189H03F2201/3233H03F1/3282
Inventor 施展李辉周建民孙刚王志奇
Owner FUJITSU LTD