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Distortion correction control apparatus and distortion correction control method

A distortion correction and control device technology, which is applied to the parts of the amplification device, electrical components, high-frequency amplifiers, etc., can solve the problems of amplifier output signal waveform deformation and slow signal rise, etc.

Inactive Publication Date: 2013-01-16
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technology, it is necessary to prepare the signal rising period before the pulse segment is ON, or to slowly rise the signal after the pulse segment is ON, which causes the waveform of the output signal of the amplifier to be deformed.

Method used

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  • Distortion correction control apparatus and distortion correction control method
  • Distortion correction control apparatus and distortion correction control method
  • Distortion correction control apparatus and distortion correction control method

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Experimental program
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no. 1 Embodiment approach

[0044] Refer to the structure (basic structure) of the first embodiment of the present invention figure 2 , the burst distortion correction control device adopts the structure of multiplying (or adding) the correction coefficient to the input signal x(t) for the transmission amplifier (RF amplifier) ​​1, so as to correct the input signal (baseband signal) x Amplifier distortion (pulse segment distortion) formed by the pulse segment of (t).

[0045] This correction coefficient (burst distortion correction coefficient) is based on the signal (in this case, the signal notifying the timing of the ON of the burst (start)) that notifies the switching between the presence of the input signal (here, the signal that notifies the timing of the burst (start) ON), that is, the burst information (opportunity), and is determined by The burst correction coefficient generator 2 generates and outputs it, and multiplies the input signal x(t) by the multiplier 3 as the inverse characteristic of...

no. 2 Embodiment approach

[0064] Figure 7 The configuration of the burst distortion correction control device according to the second embodiment of the present invention is shown. This second embodiment shows figure 2 This is a modified example of the basic configuration in the first embodiment shown.

[0065] refer to Figure 7 , the burst distortion correction control device has a burst correction coefficient generation unit 2 , a multiplier 3 , a parameter update unit 4 and an ACLR (Adjacent Channel Leakage PowerRatio: Adjacent Channel Leakage Power Ratio) measurement unit 7 .

[0066] In this burst distortion correction control device, parameters are determined by ACLR measurement. For this purpose, the ACLR of the branch signal (FB signal) y(t) to which a part of the output signal y(t) from the transmission amplifier 1 is fed back is obtained, and parameters for function approximation are determined.

[0067] The ACLR measurement unit 7 performs frequency analysis of the branch signal y(t), ...

no. 3 Embodiment approach

[0073] Figure 10 The configuration of a burst distortion correction control device according to a third embodiment of the present invention is shown. This third embodiment shows figure 2 Another modified example of the basic configuration in the first embodiment shown.

[0074] refer to Figure 10 , the burst distortion correction control device has a burst correction coefficient generation unit 2 , a multiplier 3 , a parameter update unit 4 and an error measurement unit 8 .

[0075] In this burst distortion correction control device, parameters are determined by error measurement. For this purpose, the error between the input signal x(t) as a reference signal and the branch signal (FB signal) y(t) fed back from a part of the output signal y(t) from the transmission amplifier 1 is obtained and determined (selected) Each parameter A, T, θ, ρ with the smallest error to approximate the function.

[0076] Figure 11 shows an example of a parameter determination procedure b...

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Abstract

A distortion correction control apparatus is for compensating for burst distortion of a transmission amplifier caused by a burst of an input signal of a transmission target. The apparatus includes generation means for generating a distortion correction coefficient having reverse characteristics to the burst distortion; means for multiplying the distortion correction coefficient output from the generation means by the input signal or adding the distortion correction coefficient output from the generation means to the input signal, upon reception of burst information notifying of switching between presence and absence of the input signal; and update means for updating, based on the input signal and a branch signal fed back as an output signal of the transmission amplifier, parameters of functions used for adaptively generating the distortion correction coefficient, and for inputting the updated parameters to the generation means.

Description

technical field [0001] The invention relates to a distortion correction control device and a distortion correction control method suitable for a wireless communication system. Background technique [0002] In wireless communication systems using wireless transmission methods such as Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing), burst signals are mostly used. [0003] Generally, in order to improve the power efficiency of the amplifier, the operating point of the amplifier is set to AB to B class. Therefore, when there is no signal (when the pulse segment is OFF), the current flowing to the amplifier decreases. When a signal is suddenly input (burst ON) from the burst OFF period, the current flows rapidly to the amplifier power supply system. As a result, the power system cannot follow the sharp change in current value, and the current and voltage waveforms show a transient response (refer to figure 1 ), the amplifier charac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32
CPCH03F1/3247H03F3/19H03F1/3241H03F1/32
Inventor 石川广吉长谷和男滨田一札场伸和宇都宫裕一大石泰之
Owner FUJITSU LTD