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Apparatus and method of linearizing power amplifier in mobile radio communication system

A technology for power amplifiers and communication systems, applied to power amplifiers, improved amplifiers to reduce nonlinear distortion, parts of amplifiers, etc., can solve problems such as low performance, difficulty, and dependence on high accuracy

Inactive Publication Date: 2003-12-10
SAMSUNG ELECTRONICS CO LTD
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  • Description
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Problems solved by technology

Also, efficient adders 40 and 42 must be used to obtain the error signal to update the value of the predistortion RAM 12
Constructing such high-precision analog adders is difficult, and relies on high-precision
Also, it is well known that the performance obtained by the predistortion method is lower than that obtained by the feedforward method

Method used

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  • Apparatus and method of linearizing power amplifier in mobile radio communication system
  • Apparatus and method of linearizing power amplifier in mobile radio communication system
  • Apparatus and method of linearizing power amplifier in mobile radio communication system

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Embodiment Construction

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For simplicity and to highlight the features of the present invention, the same or similar components are indicated by the same reference numerals in each figure, and the known structures and functions will not be described here.

[0019] The method and device for linearizing the characteristics of a power amplifier in a mobile wireless communication system according to an embodiment of the present invention uses a pre-distortion algorithm for baseband signals, and uses a feed-forward method for radio frequency modulation signals to compensate active components, such as The nonlinear characteristics of the power amplifier included in the transmit stage of the system to reduce the distortion of the output spectrum of the radio frequency signal.

[0020] The address of the look-up table for generating predistortion data is directly generated acc...

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Abstract

An apparatus and method is provided for linearizing the characteristic of a power amplifier in the mobile radio communication system by compensating for the non-linear characteristic of active elements included in a transmitting stage of the system. The apparatus includes an error detector for detecting an error between input and output signals of the power amplifier by comparing the fed-back output signal with the input signal, a predistortion lookup table for storing predistortion data, a predistortion lookup table controller for updating the data of the predistortion lookup table which corresponds to the position of the present input data by adding an error signal from the error detector to an output of the predistortion lookup table, a feedforward lookup table for storing feedforward control data, a feedforward lookup table controller for outputting corresponding feedforward control data of the feedforward lookup table by detecting a size of the error signal, a linearizer for distorting the input signal in accordance with the predistortion data and then controlling a gain of the input signal in accordance with the feedforward control data, and the power amplifier for power-amplifying an output of the linearizer.

Description

technical field [0001] The present invention relates to mobile radio communication systems, and in particular to a device and a method for linearizing the characteristics of power amplifiers in mobile radio communication systems by compensating for the non-linear properties of active units included in the system's transmit stage. Background technique [0002] High power amplifiers for transmitting analog data or digital data in mobile wireless communication systems require high spectral efficiency as well as high power efficiency to construct low power consumption systems within a limited frequency band. To meet general requirements in the system, baseband data modulation methods such as QPSK and QAM with high spectral efficiency have been used. Also, high-efficiency power amplifiers such as class-C amplifiers are also used to improve the transmitter power efficiency in the system. Such high-efficiency power amplifiers usually have strong nonlinear characteristics, and as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32H03D7/16H03F3/24H03G3/00H04L27/20H04L27/36
CPCH03D7/168H03F2201/3233H03F2200/336H03F1/3247H03F3/24H03G3/00
Inventor 河智元
Owner SAMSUNG ELECTRONICS CO LTD
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