WO2007049474A1 - Dispositif d'amplification de compensation de distorsion de type pre-distorsion - Google Patents

Dispositif d'amplification de compensation de distorsion de type pre-distorsion Download PDF

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Publication number
WO2007049474A1
WO2007049474A1 PCT/JP2006/320536 JP2006320536W WO2007049474A1 WO 2007049474 A1 WO2007049474 A1 WO 2007049474A1 JP 2006320536 W JP2006320536 W JP 2006320536W WO 2007049474 A1 WO2007049474 A1 WO 2007049474A1
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WO
WIPO (PCT)
Prior art keywords
distortion compensation
value
feedback signal
distortion
signal data
Prior art date
Application number
PCT/JP2006/320536
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English (en)
Japanese (ja)
Inventor
Satoshi Furuta
Original Assignee
Hitachi Kokusai Electric Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc. filed Critical Hitachi Kokusai Electric Inc.
Priority to JP2007542312A priority Critical patent/JPWO2007049474A1/ja
Publication of WO2007049474A1 publication Critical patent/WO2007049474A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages

Definitions

  • the present invention relates to a predistortion type distortion compensator that preliminarily gives a signal to be amplified with an inverse characteristic of a nonlinear characteristic of an amplifier to compensate for distortion generated in the amplifier.
  • a base station device In a mobile communication system employing a W-CDMA (Wide-band Code Division Multiple Access) system, a base station device is wirelessly connected to a mobile station device that is physically far away. The signal needs to be reached, and the transmission signal is greatly amplified by the amplifier.
  • W-CDMA Wide-band Code Division Multiple Access
  • the saturation point After the amplification limit called the saturation point, the output power becomes almost constant even when the power input to the amplifier increases, and this nonlinearity causes nonlinear distortion in the amplified transmission signal.
  • the transmission signal before amplification is out of the desired signal band (adjacent channel) due to the occurrence of nonlinear distortion in the signal after passing through the power amplifier where the signal component outside the desired signal band is suppressed to a low level by the band limiting filter.
  • the signal component will leak.
  • the predistortion method compensates for distortion generated in the amplifier by giving the amplifier input signal the inverse characteristics of AM-AM (amplitude) conversion and AM-PM (phase) conversion, which are nonlinear characteristics of the amplifier, in advance. Thus, it is intended to eliminate distortion in the output signal.
  • AM-AM amplitude
  • AM-PM phase
  • the predistortion to be applied to the input signal by the predistorter also changes.
  • the control values for controlling the V, predistorter stored in the distortion compensation table are appropriately updated, and the predistortion applied to the transmission signal by the predistorter is adjusted. It is necessary to adapt to the input / output characteristics of the amplifier after the change.
  • distortion is detected from the feedback signal, and the distortion compensation table is updated using the perturbation method so that the distortion is eliminated.
  • the distortion compensation table is temporarily updated by changing the control value stored in the distortion compensation table by a small amount (perturbation amount). If the update is enabled and the amount of distortion does not decrease, the temporary update is disabled and the distortion compensation table value is updated by repeatedly returning the value of the distortion compensation table to the value before the temporary update. is there.
  • Japanese Patent Laid-Open No. 2003-78360 discloses that a distortion compensation table is divided equally into a plurality of blocks and a perturbation method is used so that transmission output distortion is eliminated in each block unit. There is disclosed a predistortion type distortion compensation circuit for updating the above.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-78360 Disclosure of the invention
  • An object of the present invention is to provide a distortion compensation amplifying apparatus that does not update a distortion compensation table to an incorrect value even when a burst signal is transmitted.
  • a distortion compensation amplifying apparatus includes a predistorter for performing distortion compensation, an amplification unit that amplifies an amplification target signal that is distorted by the predistorter, and a feedback signal of the amplification unit power
  • a burst detection unit that monitors a level fluctuation amount and a control unit that controls the predistorter based on a return signal from the amplification unit are provided.
  • control unit controls the predistorter based on the feedback signal when the fluctuation amount of the feedback signal level is within a predetermined range. You may want to update ⁇ .
  • the distortion compensation table is not updated to an incorrect value even when transmitting a burst signal.
  • FIG. 1 is a diagram showing a configuration of a distortion compensation amplifying apparatus according to the present invention.
  • FIG. 2 is a diagram showing a flow of processing of a burst detection unit.
  • FIG. 3 is a diagram showing a flow of processing of another burst detection unit.
  • FIG. 1 is a diagram showing a configuration of a distortion compensation amplifying apparatus according to the present invention.
  • a distortion compensation amplifying apparatus 100 includes a power detection unit 101, a distortion compensation table 102, a predistorter 103, an amplification unit 104, a memory 105, and a burst detection.
  • Unit 106 and control unit 107 are provided.
  • the predistortion method includes any frequency band (for example, baseband, IF, RF ), And whether the processing is performed digitally or analogly, various embodiments are conceivable. However, since any type of the present invention can be applied, FIG. Only the basic components necessary to understand the invention are shown.
  • a DZA converter a quadrature modulation unit, an up-comparator, a filter, a down converter, an oscillator, a filter, a quadrature demodulation unit, an AZD conversion, and the like are used as appropriate.
  • the power detection unit 101 includes power (or amplitude) of an amplification target signal input from the input terminal 110.
  • the distortion compensation table 102 is configured by a memory or the like, and associates a control value for performing distortion compensation by a predistortion method with the power value of the signal to be amplified (that is, to an address corresponding to the power value). To store.
  • the distortion compensation table 102 gives the inverse characteristic of the nonlinear characteristic of the amplifying unit 104 to be compensated.
  • the predistorter 103 predistorts the amplification target signal by controlling the amplitude and phase of the amplification target signal in accordance with the control value read from the distortion compensation table 102.
  • the amplification unit 104 performs amplification of the amplification target signal that has been previously distorted by the predistorter 103.
  • the pre-distortion given in advance by the predistorter 103 is canceled, and the output signal becomes a signal without distortion.
  • the memory 105 stores the feedback signal data from the amplifying unit 104 sequentially.
  • the burst detection unit 106 detects a burst signal based on feedback signal data stored in the memory 105.
  • the burst detection unit 106 monitors the amount of change in the feedback signal level and detects a sudden change in the feedback signal level.
  • the burst detection unit 106 monitors the fluctuation amount of the carrier power, and detects the occurrence of the fluctuation amount of the carrier power exceeding the set threshold value. Notify 07.
  • the carrier power fluctuation is the difference between the reference carrier power and the carrier power acquired this time.
  • the control unit 107 performs distortion detection, predistortion calculation, update of the distortion compensation table 102, and the like based on the feedback signal data stored in the memory 105, and performs adaptive control of the distortion compensation table 102. is there.
  • control unit 107 performs fast Fourier transform (FFT) on the feedback signal data stored in the memory 105, converts the data on the time axis to data on the frequency axis, and generates intermodulation distortion. Distortion is detected by calculating the power in the frequency band, and the perturbation method is used.
  • FFT fast Fourier transform
  • V The distortion compensation table 102 is updated.
  • the control unit 107 When notified from the burst detection unit 106 that the fluctuation amount of the carrier power has exceeded a predetermined threshold, the control unit 107 does not update the distortion compensation table 102 based on the current feedback signal data, and The feedback signal data is reacquired.
  • FIG. 2 is a diagram showing a flow of processing in the burst detection unit 106.
  • the carrier power is calculated as the band power of the frequency at which each carrier is transmitted by performing FFT on the feedback signal data stored in the memory 105 and converting the data on the time axis to the data on the frequency axis. .
  • a ratio between the reference value and the calculated value is obtained, and it is determined whether or not this ratio is within a predetermined range.
  • the ratio between the reference value and the calculated value is calculated as exp I log (reference value) -log (calculated value) I by dividing the larger value by the smaller value, and is further calculated. The ratio is compared with the threshold value.
  • the threshold value to be compared with the difference between the reference value and the calculated value transmits a normal stable level. In this case, a value larger than the range in which the carrier power varies is appropriately selected.
  • this threshold is set as follows.
  • a normal stable level signal is transmitted, and the carrier power of this signal is sampled multiple times for each sample interval.
  • the carrier power value sampled in this way is divided by the value of the carrier ratio one sample before, and carrier power difference (ratio) data is created, and the maximum value of this data is set as the threshold value.
  • the power illustrated here is the case where the number of carrier power samples is five. Actually, the number of carrier power samples used to set the threshold value. Will be several hundred to several thousand (however, it does not include the transmission OFF period)
  • the threshold value may be determined in advance using an assumed transmission signal (such as IS-95ZUMTS) or may be set periodically at the start of operation or during operation.
  • an assumed transmission signal such as IS-95ZUMTS
  • the calculated carrier power is set as a new reference value. (S206), the number of reacquisition is cleared to 0 (S207), and the process is terminated.
  • control unit 107 updates the distortion detection and distortion compensation table 102 as usual.
  • the distortion compensation table 102 is not updated based on the current feedback signal data, and the feedback obtained this time The signal data is not adopted, the feedback signal data is reacquired, and the carrier power is calculated again (S201).
  • the calculated carrier power is set as a new reference value (S206), the reacquisition number is cleared to 0 (S207), and the process is terminated.
  • control unit 107 updates the distortion detection and distortion compensation table 102 as usual.
  • the carrier power of the feedback signal data used for distortion detection can be limited and stabilized within a predetermined range, and the distortion convergence time during stable level transmission can be reduced.
  • the distortion compensation table 102 can be updated without affecting it.
  • the update of the distortion compensation table 102 is stopped because the feedback signal data is reacquired, and the algorithm itself is operating. If the ON period of the burst signal (Idle Periods create in the Down Link) is sufficiently long compared to the OFF period, the distortion compensation table 102 can be updated even for the burst signal to compensate for the distortion. It becomes possible.
  • FIG. 3 is a diagram showing a processing flow of the burst detection unit 106 when averaging is performed and the force distortion compensation table 102 is updated in order to improve the accuracy of distortion detection.
  • burst detection section 106 calculates each carrier power based on feedback signal data stored in memory 105 (S301).
  • the carrier power is calculated as the band power of the frequency at which each carrier is transmitted by performing FFT on the feedback signal data stored in the memory 105 and converting the data on the time axis to the data on the frequency axis. .
  • a ratio between the reference value and the calculated value is obtained, and it is determined whether or not the force is within a predetermined range.
  • the calculated carrier power is set as a new reference value ( S307), the number of calculations is incremented by 1 (S308), the number of re-acquisition is cleared to 0 (S309), and it is determined whether or not the number of calculations exceeds the predetermined averaging number (S310) .
  • the distortion compensation table 102 is not updated based on the current feedback signal data, and the feedback obtained this time The signal data is not adopted, the feedback signal data is reacquired, and the carrier power is calculated again (S301).
  • the calculated carrier power is set as a new reference value (S307), the number of calculations is incremented by 1 (S308), the number of reacquisitions is cleared to 0 (S309), and the number of calculations is fixed. It is determined whether or not the average number of times is exceeded (S310). [0039] If the number of calculations is equal to or less than the predetermined number of averages as a result of determination (S310: No), the carrier power calculation process S301 and the following processes are performed until the number of calculations exceeds the predetermined number of averages. repeat.
  • distortion compensation can be performed normally even if the averaging time is shorter than the burst signal period.
  • the distortion compensation table is updated, which adversely affects the convergence time during stable level transmission.
  • the distortion compensation table is not updated to an incorrect value even when burst signals are transmitted.
  • burst determination is performed using feedback signal data, it can be realized only by adding a nox detector.
  • a circuit for measuring the transmission level when a configuration is adopted in which it is determined whether or not a burst is caused by a change in the transmission level and updating of the distortion compensation table is stopped in the burst state, a circuit for measuring the transmission level, and A circuit that determines that the signal is a burst signal and a circuit that synchronizes data for measuring the transmission level and feedback signal data are required.
  • the present invention can be used as a predistortion type distortion compensation device that compensates for distortion generated in an amplification section.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

La présente invention concerne un dispositif d'amplification de compensation de distorsion qui n'actualise pas une table de compensation de distorsion sur une valeur incorrecte, même pendant une transmission de signal en rafale. Lorsque les données d'un signal de retour d'information d'une unité d'amplification (104) sont fournies à une mémoire (105), une unité de détection de rafale (106) calcule chaque puissance de porteuse en fonction des données de signal de retour d'informations accumulées dans la mémoire (105), calcule une différence entre la valeur calculée de chaque puissance de porteuse et une valeur de référence de chaque puissance de porteuse de manière à décider si la différence entre la valeur calculée et la valeur de référence dépasse une valeur seuil prédéterminée. En conséquence, si la différence entre la valeur de référence et la valeur calculée est égale ou inférieure à la valeur seuil prédéterminée pour toutes les porteuses, la puissance de porteuse calculée est définie comme nouvelle valeur de référence. D'autre part, si la différence entre la valeur calculée et la référence dans au moins une porteuse dépasse la valeur seuil prédéterminée, la table de compensation de distorsion (102) n'est pas mise à jour selon les données de signal de retour d'informations actuelles et les données de signal du retour d'informations sont acquises à nouveau sans employer les données du signal de retour d'informations actuellement acquises.
PCT/JP2006/320536 2005-10-24 2006-10-16 Dispositif d'amplification de compensation de distorsion de type pre-distorsion WO2007049474A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007542312A JPWO2007049474A1 (ja) 2005-10-24 2006-10-16 プリディストーション方式歪補償増幅装置

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JP2005308302 2005-10-24
JP2005-308302 2005-10-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009118454A (ja) * 2007-10-18 2009-05-28 Fujitsu Ltd 無線送信装置
US9813028B2 (en) 2015-09-28 2017-11-07 Fujitsu Limited Wireless device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5734143B2 (ja) * 2011-09-08 2015-06-10 株式会社日立国際電気 増幅装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003103166A1 (fr) * 2002-05-31 2003-12-11 富士通株式会社 Compensateur de distorsion
JP2004112252A (ja) * 2002-09-18 2004-04-08 Hitachi Kokusai Electric Inc バーストエッジ検出回路及び歪補償増幅装置
JP2004128921A (ja) * 2002-10-03 2004-04-22 Hitachi Kokusai Electric Inc 歪補償装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003103166A1 (fr) * 2002-05-31 2003-12-11 富士通株式会社 Compensateur de distorsion
JP2004112252A (ja) * 2002-09-18 2004-04-08 Hitachi Kokusai Electric Inc バーストエッジ検出回路及び歪補償増幅装置
JP2004128921A (ja) * 2002-10-03 2004-04-22 Hitachi Kokusai Electric Inc 歪補償装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009118454A (ja) * 2007-10-18 2009-05-28 Fujitsu Ltd 無線送信装置
US9813028B2 (en) 2015-09-28 2017-11-07 Fujitsu Limited Wireless device

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