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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 components of the amplification device, electrical components, high-frequency amplifiers, etc., and can solve problems such as slow signal rise and waveform deformation of the amplifier output signal

Inactive Publication Date: 2010-03-31
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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no. 1 Embodiment approach

[0044] Refer to that showing the structure (basic structure) of the first embodiment of the present invention figure 2 , The pulse segment distortion correction control device adopts a structure in which the input signal x(t) for the transmission amplifier (RF amplifier) ​​1 is multiplied by (or can be added) a correction coefficient to correct the input signal (baseband signal) x (t) Amplifier distortion caused by the pulse segment (pulse segment distortion).

[0045] The correction coefficient (pulse segment distortion correction coefficient) is based on the signal notifying the switch between the presence or absence of the input signal (here means the signal notifying the timing of the pulse segment (start) ON), that is, the pulse segment information (opportunity). The pulse segment correction coefficient generator 2 generates and outputs it, and as the inverse characteristic of the pulse segment distortion, it is multiplied by the input signal x(t) by the multiplier 3. The p...

no. 2 Embodiment approach

[0064] Figure 7 The configuration of the pulse segment distortion correction control device of the second embodiment of the present invention is shown. This second embodiment shows figure 2 A modification example of the basic structure in the first embodiment shown.

[0065] Reference 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 Power Ratio) measuring unit 7.

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

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

no. 3 Embodiment approach

[0073] Picture 10 The configuration of the pulse segment distortion correction control device according to the third embodiment of the present invention is shown. This third embodiment shows figure 2 Another modification example of the basic structure in the first embodiment shown.

[0074] Reference Picture 10 The pulse segment distortion correction control device has a pulse segment correction coefficient generation unit 2, a multiplier 3, a parameter update unit 4, and an error measurement unit 8.

[0075] In this pulse segment distortion correction control device, parameters are determined by error measurement. For this reason, the error between the input signal x(t) as the 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 determined and determined (selected) The parameters A, T, θ, ρ with the smallest error are used to approximate the function.

[0076] Picture 11 Shows an example of ...

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Abstract

The invention provides a distortion correction control apparatus and a distortion correction control method. The distortion correction control apparatus for compensating the burst distortion of a transmission amplifier caused by the burst of an input signal to be transmitted. The apparatus comprises a generating means for generating a distortion correction coefficient having the opposite characteristic to the foregoing burst distortion; a means for multiplying the input signal by the distortion correction coefficient outputted from the generating means or adding the distortion correction coefficient to the input signal when receiving burst information notifying a change between presence and absence of the input signal; and an updating means for updating, based on both the input signal anda branch signal fed back as an output signal of the transmission amplifier, the parameter of a function used for adaptively generating the distortion correction coefficient and for inputting the updated parameter to the generating 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 that use wireless transmission methods such as Orthogonal Frequency Division Multiplexing (OFDM), 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~B level. Therefore, when there is no signal (when the pulse segment is OFF), the current flowing to the amplifier decreases. When a signal is inputted abruptly from the pulse segment OFF period (pulse segment ON), the current flows rapidly to the amplifier power supply system. As a result, the power system cannot follow the sudden change in current value, and the current and voltage waveforms show a transient response (refer to figure 1 ), the amplifier characteristics change. [0004] The fo...

Claims

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Application Information

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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