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Predistorter control device and method as well as power control state detection method

A predistorter, power control technology, applied in the parts of the amplifier, amplifiers with control circuits, and improving amplifiers to reduce nonlinear distortion, etc., can solve performance deterioration, difficult to keep up with changes in link nonlinearity, etc problem, to achieve the effect of improving performance

Inactive Publication Date: 2012-05-30
FUJITSU LTD
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Problems solved by technology

However, in the adaptive predistorter coefficient update unit 110, the convergence of the update algorithm needs a certain amount of time, especially when the scalar method predistorter is used, the convergence time is longer. When the communication system performs continuous and rapid power control, the predistortion It is difficult for the device 102 and the predistorter coefficient update unit 110 to keep up with the change of link nonlinearity, which will cause the performance of the system to deteriorate

Method used

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  • Predistorter control device and method as well as power control state detection method
  • Predistorter control device and method as well as power control state detection method
  • Predistorter control device and method as well as power control state detection method

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Embodiment Construction

[0019] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In order to make the present invention clear and concise, descriptions of components of the prior art that may make the present invention unclear are omitted herein. In addition, the same or similar components are described herein with the same reference numerals, and repeated descriptions thereof are omitted.

[0020] figure 2 A schematic functional block diagram of a power amplifier system according to an embodiment of the present invention is shown. Compared figure 1 and figure 2 ,exist figure 2 In the shown power amplifier system according to an embodiment of the present invention, an analog-to-digital converter 201 , a power control state detection unit 202 , a coefficient storage unit 203 and a selector 204 are added. Due to other components and figure 1 are the same as those shown in , so they will not be repeated here.

[0021] An analo...

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Abstract

The invention relates to a predistorter control device and a method as well as a power control state detection method. A predistorter is used for predistorting a signal input into a power amplifier. The predistorter control method comprises the following steps of: storing, namely storing a predistortion coefficient used by the predistorter; acquiring an index, namely acquiring an index indicating output power of the power amplifier; detecting a power control state, namely detecting whether the power amplifier is in a power control state according to the index acquired in the index acquisition step; and supplying the coefficient, namely if the power amplifier is in the power control state, supplying the stored predistortion coefficient to the predistorter, and if the power amplifier is not in the power control state, supplying a predistortion coefficient calculated by a unit for adaptively updating the predistortion coefficient to the predistorter.

Description

technical field [0001] The present invention relates to power amplifiers (hereinafter referred to as power amplifiers), and more specifically, the present invention relates to adaptive digital predistortion control of power amplifiers. Background technique [0002] Adaptive digital predistortion (DPD) technology is an effective method for correcting the nonlinearity of power amplifiers, and it has been widely used in wireless communication transmission systems. [0003] figure 1 A schematic block diagram of a known power amplifier system is given in . Such as figure 1 As shown, the baseband source information x(n) from the source 101 passes through the digital predistorter 102 to obtain a predistorted signal, which is converted into an analog signal by a digital-to-analog (D / A) converter 103 . After the analog signal is up-converted into a radio frequency signal by the up-converter 104 , it is input to an analog variable gain attenuator (VGA) 105 , and then input to a pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49H03F1/32
CPCH03F1/3258H03F1/3247H03F2201/3212H04L27/368
Inventor 李辉岩松隆则周建民
Owner FUJITSU LTD
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