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Amplifier with distortion compensator and radio communication base station

A wireless communication, power amplifier technology, applied in amplifiers, improving amplifiers to reduce nonlinear distortion, communication between multiple stations, etc., can solve problems such as difficulty in giving operation speed

Inactive Publication Date: 2003-02-05
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to provide A / D and D / A converters with sufficient operation speed and desired precision (number of bits)

Method used

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  • Amplifier with distortion compensator and radio communication base station
  • Amplifier with distortion compensator and radio communication base station
  • Amplifier with distortion compensator and radio communication base station

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Embodiment Construction

[0115] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, like reference numerals are used to denote and designate corresponding or identical parts. For a better understanding of the invention, refer to figure 2 , first explain the schematic diagram of the amplifier with distortion compensation according to the present invention.

[0116] exist figure 2 In , reference numerals 1, 2, 3 and 4 denote power amplifiers, quadrature modulators, quadrature demodulators and local oscillators, respectively, similar to those shown in FIG. 1 . Furthermore, suppose figure 2 All baseband signals in are complex signals. The multiplier 60 multiplies the baseband input signal X(t) by the distortion compensation coefficient output from the estimated compensation coefficient generator 50 using an adaptive type algorithm.

[0117] Thus, the estimated compensation coefficient generator 50 using an adaptive type alg...

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Abstract

A wireless communication base station includes: a high frequency power amplifier for amplifying and sending transmission signals via receiving and transmitting antennas; an A / D converter; a linear circuit mounted at an input side of the high frequency power amplifier, a mirror frequency interference restraining transducer mounted between the linear circuit and the high frequency power amplifier, and comprising a first phase shift circuit, a first D / A converter and a second D / A converter used for directly converting an output of the linear circuit into a corresponding analog signal, and a first and a second mixing circuit for using output of the first and the second D / A converter as orthogonal signals of an I channel and a Q channel, and mixing the orthogonal signals of the I channel the a Q channel with an oscillation signal having a higher frequency than the output of the first and the second D / A converter, the phases of the orthogonal signals are shifted with 90 DEG respectively.

Description

technical field [0001] The present invention relates to an amplifier with distortion compensation, and more particularly, to an amplifier used as a power amplifier for amplifying a linear modulation signal or a low noise amplifier for receiving and amplifying a linear modulation signal. Furthermore, the present invention relates to a configuration of a base station for wireless communication using the amplifier for performing distortion compensation. Background technique [0002] Recently, there has been a demand to use an amplifier having a highly linear characteristic as a power amplifier for amplifying a linearly modulated signal or as a low noise amplifier used in a receiver for receiving a linearly modulated signal in order to suppress noise caused by spectral characteristics or distortion of a transmitted signal. Deterioration of transmission characteristics. [0003] In many applications, amplifiers are also required to have high power efficiency. However, it is oft...

Claims

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Application Information

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IPC IPC(8): H03D7/16H03F1/32
CPCH03F1/3241H03F2200/372H03D7/168
Inventor 高野健大石泰之福田英辅古川秀人长谷和男
Owner FUJITSU LTD
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