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Device and method for measuring nonlinearity of power amplifier and predistortion compensation device

A power amplifier, pre-distortion compensation technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, power amplifiers, components of amplification devices, etc.

Inactive Publication Date: 2010-02-24
FUJITSU LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The present invention proposes a new cost function and its implementation device for scalar digital pre-distortion technology, in order to overcome one or more of the above-mentioned shortcomings of the prior art, and at least provide a beneficial option

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  • Device and method for measuring nonlinearity of power amplifier and predistortion compensation device
  • Device and method for measuring nonlinearity of power amplifier and predistortion compensation device
  • Device and method for measuring nonlinearity of power amplifier and predistortion compensation device

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Embodiment Construction

[0052] figure 2 It schematically shows a structural block diagram of a power amplifier device according to an embodiment of the present invention. The power amplifier device can be used, for example, in a base station in a wireless communication system or a transmitter in a user terminal. The power amplifier device can also be used in other devices that need to use power amplifiers, such as satellite and radar transmitters. In fact, the present invention can be applied to any system with pilots in the frequency domain. In other words, the communication system of the present invention includes any system in which the signal used has a pilot in the frequency domain. The following describes the case where the power amplifier device is used in a user terminal.

[0053] Such as figure 2 As shown, the source signal from the signal source 100 is subjected to distortion compensation by the distortion compensator 201, and then converted into an analog signal by the digital / analog conv...

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Abstract

The invention relates to a device and a method for measuring the nonlinearity of a power amplifier and a predistortion compensation device. The device for measuring the nonlinearity of the power amplifier comprises: a delayer (304) used for delaying the input of pilot frequency data; a subtracter (305) used for reducing pilot frequency data input subsequently from the pilot frequency data delayedby the delayer; a power calculating unit (306) used for calculating instantaneous power of an output signal of the subtracter (305); and an average (307) used for averaging the instantaneous power calculated by the power calculating unit (306) to obtain an average power.

Description

Technical field [0001] The present invention relates to a power amplifier, in particular to a predistortion compensation device and method of the power amplifier. Background technique [0002] The power amplifier (PA) is an important part of electronic equipment. It can amplify the power of weak electrical signals to meet the needs of transmission and emission. Among them, 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 needs. Here, the ability of the PA to convert DC energy into AC energy is called the efficiency of the PA. The power relationship between PA input and output signal can be divided into linear zone, non-linear zone and saturation zone. [0003] When the envelope of the input signal fluctuates only in the linear region, the input signal is ideally amplified. When the envelope of the input signal fluctuates to the nonlinear region, the ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH04B2001/0433H03F1/3247H04B1/0475H03F3/24H03F1/34
Inventor 孙刚周建民施展李辉
Owner FUJITSU LTD
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