EP1082845A1 - Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur - Google Patents

Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur

Info

Publication number
EP1082845A1
EP1082845A1 EP99913287A EP99913287A EP1082845A1 EP 1082845 A1 EP1082845 A1 EP 1082845A1 EP 99913287 A EP99913287 A EP 99913287A EP 99913287 A EP99913287 A EP 99913287A EP 1082845 A1 EP1082845 A1 EP 1082845A1
Authority
EP
European Patent Office
Prior art keywords
enable
signal
adaptive
level control
control
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP99913287A
Other languages
German (de)
English (en)
Inventor
Heinrich Schenk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infineon Technologies AG
Original Assignee
Infineon Technologies AG
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 Infineon Technologies AG filed Critical Infineon Technologies AG
Priority to EP99913287A priority Critical patent/EP1082845A1/fr
Publication of EP1082845A1 publication Critical patent/EP1082845A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of DC offset
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4919—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using balanced multilevel codes
    • H04L25/4921—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using balanced multilevel codes using quadrature encoding, e.g. carrierless amplitude-phase coding

Definitions

  • the invention relates to an adaptive CAP receiver and, in particular, relates to a method for controlling the individual control loops of an adaptive CAP receiver in order to ensure stable running-in and stable operation of the receiver.
  • a frequency division multiplex method proves to be cheaper than a baseband equalization method with echo compensation for duplex data transmission over subscriber lines, in spite of the higher bandwidth requirement, since the near-end crosstalk dominating in this speed range can be suppressed by selective filtering.
  • single-carrier methods such as QAM (Quadrature Amplitude Modulation) and CAP (Carrierless Amplitude / Phase Modulation) are currently being discussed under the keyword VDSL (Very high bitrate digital Subscriber Line), since this means the different frequency ranges for forward and reverse direction can be realized in a simple manner by a suitable choice of the carrier or center frequencies.
  • the data rates range from approximately 2 Mbit / s to 50 Mbit / s. Both symmetrical and asymmetrical operation should be possible. Symmetrical operation, ie the same data rates in both directions, is usually required in commercial applications, while asymmetrical operation, ie different data rates for the two directions, is usually sufficient in the private sector is (high data rate to the subscriber, low data rate to the service provider).
  • ADSL Asymmetry Digital Subscriber Line
  • the binary data are combined into groups of L bits on the transmission side and fed to an encoder. This assigns a point in a two-dimensional signal space to each of the 2 L combinations, which is defined by the Cartesian coordinates (x, y). This signal point can also be viewed as the point of the complex number planes.
  • a CAP modulator is considered first.
  • the signal points to be transmitted defined by the two Cartesian coordinates a ⁇ and b ⁇ at time kT, are in
  • Step clock (symbol rate) f f 1 / T sampled and given to separate subchannels, in each of which there is a transmission filter. Then the signals of both subchannels are added and the transmission signal is transmitted to the transmission channel.
  • the received input signal is subjected to an A / D conversion with a predetermined sampling clock. After the digital A / D conversion, a digital level control is carried out to determine the level of the reception
  • the samples are sent to the pair of receive filters.
  • the coefficients of the filter pair have to be adjusted adaptively, using a fixed set of coefficients that length is started.
  • the signal values are sampled at the symbol rate fj and fed to a decision maker. It has the task of assigning received data to each pair of values received. After the setting has been made and if the interference is sufficiently low, these reception values, apart from a constant delay and an additional rotation of the complex data vector by ⁇ 90 ° or ⁇ 180 °, match the transmitted data values.
  • the adaptive GAP receiver contains three control loops, namely the control of the sampling clock, the control of the digital level adjustment and the control of the filter coefficients. The problem arises that when the control loops are coupled, stable behavior of the CAP recipient is not guaranteed.
  • the invention is therefore based on the object of creating a method for decoupling the control loops of a CAP receiver, in order to ensure stable behavior of the CAP receiver, and a corresponding CAP receiver.
  • the digital level control and the adaptive are used to control a CAP receiver with a clock-controlled A / D converter for converting the input signal, a digital level control, an adaptive regulated receive filtering with two parallel filters and a subsequent decision maker for outputting the reconstructed signal coordinates
  • Two ENABLE signals are preferably generated to control the decoupling, the first ENABLE signal activating the digital level control, while the second ENABLE signal activates the coefficient setting of the adaptive receive filtering.
  • the mean of the two decision errors and the mean of the reception level can be used to generate the ENABLE signals.
  • the mean value for the reception level is compared with a predetermined reference value, the first ENABLE signal being set to one and the second ENABLE signal to zero if the mean value is greater than the reference value. If the mean value of the reception level is less than the reference value, the first ENABLE signal is set to zero, but the second ENABLE signal is only set to one when the mean decision error is less than a predetermined threshold.
  • the arrival of the CAP receiver only worked with a four-stage CAP signal.
  • the level control regulates the amplification factor in such a way that a predetermined level value results at the output of the pair of reception filters.
  • the respective decision error is also used to regulate the coefficient setting.
  • the clock control is derived from the values before and after the decision maker and a coefficient of the filter pair.
  • 1 shows the block diagram of an adaptive CAP receiver
  • 2 shows the block diagram of the level control
  • Fig. 6 shows the block diagram of the generation of the ENABLE signals.
  • the frequency of the sampling of the A / D conversion can be regulated via a clock control 2.
  • a digital level control with a level controller 3 consisting of a multiplier 4 and a controllable amplifier 5 is carried out in order to make the level of the received signal as independent as possible of the transmission line and the crosstalk of the own transmit signal and all other outband interference set to a constant value.
  • the gain factor AGC generated in the amplifier 5 is set via a controller 6.
  • the samples of the received signal arrive at a pair of receive filters 7 and 8, the receive filter 7 having the coefficient set h1 and the receive filter 8 having the coefficient set h2.
  • the coefficient sets hl, h.2 of the filter pairs 7 and 8 must be adaptively set, starting with a fixed coefficient set, which is designed for a specific line length.
  • the coefficients of the filters 7 and 8 can each be regulated with a filter setting 9 and 10.
  • the two signals are sampled at the symbol rate fp and fed to a decision maker 11.
  • the decision maker 11 has the task of assigning received data to each pair of values received. After the setting has been made and if the interference is sufficiently low, the received values ä ⁇ and bk match the transmitted data values apart from a constant delay and an additional rotation of the complex data vector by ⁇ 90 ° or 180 °.
  • Fig. 2 shows a block diagram of the level control.
  • the controller 6 controls the amplification factor of the amplifier 5 in such a way that a level which can be predetermined with the aid of a specific reference value is obtained at the output of the reception filter pair 7 and 8.
  • the control criterion is therefore determined from the values sampled in the symbol cycle at the output of the filter pair 7, 8 by determining the absolute value of the filtered data in absolute value formers 20 and 21, and feeding the absolute values and a reference value Ref to an adder 22. After averaging in an averager 23, the generated mean value is fed to the controller 6 for regulating the gain factor AGC.
  • Fig. 3 shows a block diagram for the setting of the filter coefficients.
  • the decision error of the decision maker 11 is used to set the respective filter coefficients, ie the control information for setting the filter coefficients is obtained directly from the difference values of the signals before and after the decision maker 11.
  • the signal values of the two filter branches before and after the filter 7, 8 are each fed to an adder 30, 31, the signal value after the decision maker 11 being taken negatively.
  • the resulting decision error can be used directly as a control signal for the respective controller for setting the filter coefficients. If the transmission is error-free, convergence can be ensured using suitable setting algorithms. Because at the beginning of the connection establishment with many wrong decisions of the decision maker 11 is to be expected, the filter pair 7, 8 cannot be reliably run in at first. Therefore, a four-stage CAP signal is initially used for the transmission in order to keep the number of wrong decisions as small as possible despite the incorrect setting of the receive filter pair.
  • the so-called SGN-SGN algorithm can be used for setting the coefficient with a view to the simplest possible implementation.
  • the filter coefficients are calculated as follows:
  • the manipulated variable 2 ⁇ V- influences the setting speed and the accuracy of the filter setting. It makes sense to set the value ⁇ depending on the mean error value. At the start of the filter setting with a correspondingly large mean error, a relatively large actuating distance (small ⁇ ) can be used to accelerate the running-in process. As the error becomes smaller, the manipulated variable must be gradually increased to its final value.
  • the manipulated variable 2 " ⁇ must be reduced if there are larger outband interference, since the sensitivity of the blocking attenuation of the reception filters 7, 8 to changes in coefficient is very high.
  • FIG. 4 shows a block diagram for the regulation of the sampling clock.
  • the derivation of the information for the regulation of the sampling clock can also be obtained with the aid of the values before and after the decision maker 11.
  • a shift in the sampling phase causes an additional rotation of the received data vector in addition to an increase in symbol interference.
  • ⁇ k u 1 (kT) - Ab k - U2 (kT) - ⁇ S k
  • the two regulations must be decoupled. This can be achieved by the additional weighted addition of a filter coefficient.
  • the sampling phase is set such that the value used for the filter coefficient used is zero. This coefficient should therefore be as small as possible in the starting solution of the reception filter pair.
  • the value v denotes the number of the coefficients of the reception filter 7 or 8 and ⁇ the weighting coefficient.
  • the average error MERR after the decision maker 11 represents the absolute average of the two decision errors ⁇ äj and Ab k .
  • FIG. 6 shows a block diagram for generating the two ENABLE signals which control the level control and the control of the filter coefficients.
  • a reference level RP is subtracted from the mean reception level MY in an adder 60.
  • the amount of the resulting value is formed in an amount generator 61.
  • a reference level deviation DRP is subtracted from this amount in a further adder 62.
  • a logical one is generated at the output of a subsequent limiter 63 if the input value is greater than or equal to zero. If the input value of limiter 63 is less than zero, this creates a logical zero.
  • This signal forms the ENABLE signal ENABLE (AGC) for level control 3.
  • Error MERR after the decision maker 11 subtracts a reference error RF in an adder 64.
  • a subsequent limiter 65 produces a logic one at its output when the output of adder 64 is greater than or equal to zero. If the output signal of the adder 64 is less than zero, the limiter 65 generates a logic zero at its output.
  • the two output signals of the limiters 63 and 65 are inverted in inverters 66 and 67 and the inverted signals are fed to an AND gate 68, the output signal of which represents the desired ENABLE signal for regulating the filter coefficients. Linking the ENABLE signal to control the regulation of the filter coefficients ensures that the second ENABLE signal for the coefficient regulation is only active, i.e. logic "1" if the first ENABLE signal of the level control is inactive, i.e. logical "0".

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Dc Digital Transmission (AREA)

Abstract

L'invention concerne un récepteur adaptatif de système de planification de processus assistée par ordinateur, qui comprend un convertisseur A/N synchronisé pour convertir le signal d'entrée, une régulation de niveau, un filtrage de réception à régulation adaptative qui comporte deux filtres parallèles et un système de décision subséquent, servant à fournir les coordonnées reconstituées des signaux. Selon l'invention, la régulation numérique du niveau et le filtrage adaptatif de réception sont découplés du fait que soit l'ajustement de la régulation numérique du niveau, soit l'ajustement de coefficient du filtrage adaptatif de réception est actif.
EP99913287A 1998-06-04 1999-03-17 Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur Withdrawn EP1082845A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99913287A EP1082845A1 (fr) 1998-06-04 1999-03-17 Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP98110217A EP0964555A1 (fr) 1998-06-04 1998-06-04 Réglage de seuil et filtrage adaptatif dans des récepteurs CAP
EP98110217 1998-06-04
EP99913287A EP1082845A1 (fr) 1998-06-04 1999-03-17 Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur
PCT/EP1999/001890 WO1999063718A1 (fr) 1998-06-04 1999-03-17 Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur

Publications (1)

Publication Number Publication Date
EP1082845A1 true EP1082845A1 (fr) 2001-03-14

Family

ID=8232058

Family Applications (2)

Application Number Title Priority Date Filing Date
EP98110217A Withdrawn EP0964555A1 (fr) 1998-06-04 1998-06-04 Réglage de seuil et filtrage adaptatif dans des récepteurs CAP
EP99913287A Withdrawn EP1082845A1 (fr) 1998-06-04 1999-03-17 Regulation de niveau et filtrage adaptatif dans des recepteurs de systeme de planification de processus assistee par ordinateur

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP98110217A Withdrawn EP0964555A1 (fr) 1998-06-04 1998-06-04 Réglage de seuil et filtrage adaptatif dans des récepteurs CAP

Country Status (5)

Country Link
US (1) US6370206B1 (fr)
EP (2) EP0964555A1 (fr)
JP (1) JP2002517949A (fr)
CN (1) CN1127248C (fr)
WO (1) WO1999063718A1 (fr)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048734A (en) 1995-09-15 2000-04-11 The Regents Of The University Of Michigan Thermal microvalves in a fluid flow method
US6692700B2 (en) 2001-02-14 2004-02-17 Handylab, Inc. Heat-reduction methods and systems related to microfluidic devices
US6852287B2 (en) 2001-09-12 2005-02-08 Handylab, Inc. Microfluidic devices having a reduced number of input and output connections
US7323140B2 (en) 2001-03-28 2008-01-29 Handylab, Inc. Moving microdroplets in a microfluidic device
US7010391B2 (en) 2001-03-28 2006-03-07 Handylab, Inc. Methods and systems for control of microfluidic devices
US7829025B2 (en) 2001-03-28 2010-11-09 Venture Lending & Leasing Iv, Inc. Systems and methods for thermal actuation of microfluidic devices
US8895311B1 (en) 2001-03-28 2014-11-25 Handylab, Inc. Methods and systems for control of general purpose microfluidic devices
EP1654066B1 (fr) 2003-07-31 2014-11-12 Handylab, Inc. Traitement d'echantillons contenant des particules
EP2345739B8 (fr) 2004-05-03 2016-12-07 Handylab, Inc. Dispositif microfluidique permettant de traiter des échantillons contenant un polynucléotide
US8852862B2 (en) 2004-05-03 2014-10-07 Handylab, Inc. Method for processing polynucleotide-containing samples
US7998708B2 (en) 2006-03-24 2011-08-16 Handylab, Inc. Microfluidic system for amplifying and detecting polynucleotides in parallel
US11806718B2 (en) 2006-03-24 2023-11-07 Handylab, Inc. Fluorescence detector for microfluidic diagnostic system
US8088616B2 (en) 2006-03-24 2012-01-03 Handylab, Inc. Heater unit for microfluidic diagnostic system
US9040288B2 (en) 2006-03-24 2015-05-26 Handylab, Inc. Integrated system for processing microfluidic samples, and method of using the same
US10900066B2 (en) 2006-03-24 2021-01-26 Handylab, Inc. Microfluidic system for amplifying and detecting polynucleotides in parallel
WO2008061165A2 (fr) 2006-11-14 2008-05-22 Handylab, Inc. Cartouche microfluidique et son procédé de fabrication
WO2008060604A2 (fr) 2006-11-14 2008-05-22 Handylab, Inc. Système microfluidique utilisé pour amplifier et détecter des polynucléotides en parallèle
US8133671B2 (en) 2007-07-13 2012-03-13 Handylab, Inc. Integrated apparatus for performing nucleic acid extraction and diagnostic testing on multiple biological samples
USD621060S1 (en) 2008-07-14 2010-08-03 Handylab, Inc. Microfluidic cartridge
US8182763B2 (en) 2007-07-13 2012-05-22 Handylab, Inc. Rack for sample tubes and reagent holders
US9186677B2 (en) 2007-07-13 2015-11-17 Handylab, Inc. Integrated apparatus for performing nucleic acid extraction and diagnostic testing on multiple biological samples
US20090136385A1 (en) 2007-07-13 2009-05-28 Handylab, Inc. Reagent Tube
US8287820B2 (en) 2007-07-13 2012-10-16 Handylab, Inc. Automated pipetting apparatus having a combined liquid pump and pipette head system
ES2648798T3 (es) 2007-07-13 2018-01-08 Handylab, Inc. Materiales de captura de polinucleótidos y métodos de utilización de los mismos
US8105783B2 (en) 2007-07-13 2012-01-31 Handylab, Inc. Microfluidic cartridge
US9618139B2 (en) 2007-07-13 2017-04-11 Handylab, Inc. Integrated heater and magnetic separator
USD618820S1 (en) 2008-07-11 2010-06-29 Handylab, Inc. Reagent holder
USD787087S1 (en) 2008-07-14 2017-05-16 Handylab, Inc. Housing
CN106190806B (zh) 2011-04-15 2018-11-06 贝克顿·迪金森公司 扫描实时微流体热循环仪和用于同步的热循环和扫描光学检测的方法
DK2761305T3 (da) 2011-09-30 2017-11-20 Becton Dickinson Co Forenet reagensstrimmel
USD692162S1 (en) 2011-09-30 2013-10-22 Becton, Dickinson And Company Single piece reagent holder
WO2013067202A1 (fr) 2011-11-04 2013-05-10 Handylab, Inc. Dispositif de préparation d'échantillons de polynucléotides
DK2810080T3 (da) 2012-02-03 2024-06-17 Becton Dickinson Co Eksterne filer til fordeling af molekylære diagnostiske tests og bestemmelse af kompatabilitet imellem tests
CN103199913B (zh) * 2013-04-03 2016-06-29 福建京奥通信技术有限公司 高性能gsm选频ics直放站

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032762A (en) * 1975-10-07 1977-06-28 Rockwell International Corporation Adjustable digital filter for high speed digital transmission
US4691342A (en) * 1983-09-09 1987-09-01 Cts Corporation Multi-speed, full duplex modem
GB2267629B (en) * 1992-06-03 1995-10-25 Fujitsu Ltd Signal error reduction in receiving apparatus
CA2110881C (fr) * 1992-12-09 1998-07-28 Kyo Takahashi Egaliseur adaptatif pouvant corriger les decalages de frequence de porteuse
KR0145439B1 (ko) * 1994-06-14 1998-07-15 김광호 고선명 텔레비젼용 적응등화기의 동작제어 방법 및 장치
US5859871A (en) * 1996-03-12 1999-01-12 British Telecommunications Public Limited Company Transmitting digital signals
SG99276A1 (en) * 1996-09-04 2003-10-27 Texas Instruments Inc A multiplexed approach to adsl atu-c concentration
US6067319A (en) * 1996-09-04 2000-05-23 Integrated Device Technology, Inc. Method for equalization of a quadrature amplitude modulated signal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9963718A1 *

Also Published As

Publication number Publication date
WO1999063718A1 (fr) 1999-12-09
CN1127248C (zh) 2003-11-05
US6370206B1 (en) 2002-04-09
EP0964555A1 (fr) 1999-12-15
CN1303560A (zh) 2001-07-11
JP2002517949A (ja) 2002-06-18

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