WO1993017348A1 - Verfahren zum erkennen eines nichtlinearen verhaltens einer zu untersuchenden digitalen daten-übertragungsstrecke - Google Patents
Verfahren zum erkennen eines nichtlinearen verhaltens einer zu untersuchenden digitalen daten-übertragungsstrecke Download PDFInfo
- Publication number
- WO1993017348A1 WO1993017348A1 PCT/DE1993/000109 DE9300109W WO9317348A1 WO 1993017348 A1 WO1993017348 A1 WO 1993017348A1 DE 9300109 W DE9300109 W DE 9300109W WO 9317348 A1 WO9317348 A1 WO 9317348A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- sequence
- spectral components
- additional
- test signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
- H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
- H04L1/241—Testing correct operation using pseudo-errors
Definitions
- a digital random signal is sent as a test signal on the line input side.
- An output signal received on the track output side due to the test signal is cross-correlated with the delayed test signal for evaluation.
- a function is obtained from the cross-correlation, which corresponds to the transfer function of the data transmission link to be examined.
- the invention is therefore based on the object of providing a method with which a non-linear behavior of a digital data transmission link to be examined is recognized in a reliable and simple manner and, if necessary, the quality of a determined transmission function is assessed therefrom can be .
- This object is achieved according to the invention by a method for recognizing a non-linear behavior of a digital data transmission link to be examined,
- a sample signal is formed by linking a sequence with spectral components distributed equidistantly in the frequency range with such an additional function that the sample signal contains, in addition to the spectral components of the sequence, additional, preferably at least partially equidistant, spectral components,
- an output signal received on the track output side on the track output side is evaluated at predetermined evaluation frequencies, frequencies being selected as evaluation frequencies at which the test signal itself is free of spectral components and at which the sample signal has additional spectral components after self-convolution in the frequency range.
- the method according to the invention is based on the essential finding that by modifying a periodically transmitted sequence by means of an additional signal, spectral components due to non-linearities occur separately from the spectral components of the original sequence and can thus be evaluated separately.
- a nonlinear transfer function basically contains quadratic parts and / or parts of higher power. These components result in a multiplication of the sample signal, which corresponds to a self-folding of the sample signal in the frequency domain.
- the evaluation frequencies are matched to the additional spectral components caused by the self-convolution, so that the spectral components of the output signal occurring at the evaluation frequencies can advantageously be directly and easily evaluated as a sign of non-linearity of the transmission link.
- Another advantage of the invention is that the additional spectral shares a measure of the non-linearity.
- the sequence used can be additively linked to the additional function, which has, for example, a spectrum of a so-called S (delta) comb.
- a further development of the method according to the invention with regard to the generation of the sample signal consists in that the sequence is linked multiplicatively with the additional function.
- the method according to the invention can be configured particularly advantageously in that a binary, bipolar random number sequence signal with a crest factor of preferably one is used as the sequence, in that the output signal with a reference signal corresponding to the test signal while obtaining a measurement signal in the time domain is cross-correlated or multiplied in the frequency domain and that the measurement signal is evaluated as a function of the size of the additional spectral components.
- the method according to the invention can be combined in a simple manner with a method described in the older German patent application with the official file number P 41 10 439.0-35, in which the output signal cross-corrects or with a reference signal corresponding to the test signal to obtain a measurement signal is multiplied; by correspondingly expanded, additional sampling of the measurement signal at the evaluation frequencies, the measurement signal can be used both to determine the transmission properties and to identify a (possibly no longer tolerable) non-linearity of the data transmission path. Being particularly advantageous it is considered if, when a certain additional spectral component is exceeded, the determined transfer function and possibly further transfer properties are at least identified as faulty.
- FIG. 1 shows an exemplary embodiment of an arrangement for carrying out the method according to the invention in a schematic illustration
- FIG. 2 shows the time course of a sequence
- FIG. 3 shows a test signal obtained by linking the sequence with an additional function
- FIG. 4 shows an output signal received on the track output side.
- a generator 1 for generating a sample signal M 1 .
- the generator 1 contains a pseudorandom generator 2 for generating 2 n -m sequences (cf. "semiconductor circuit technology", Tietze / Schenk, 1980, pp. 509-512).
- a 2 - sequence m formed by the pseudo random generator 2 can be obtained from the following sequence of numbers
- the periodically emitted m sequence has m spectral lines S1 S10 only for
- the spectral lines S1. . . S10 are distributed equidistantly at least in a frequency range of interest for the investigation. If the m-sequence with its spectrum according to FIG. 2 is transmitted over a transmission link with a non-linear transfer function, then also sum and difference frequencies occur in the spectrum of the received m-sequence at the frequencies according to the equation (Eq ) on. They overlap the spectral lines S1. . . S10 of the transmitted, original m-sequence m, so that a division and evaluation of the spectrum with regard to the transfer function and the corruption by non-linearities is not possible.
- the generator 1 (FIG. 1) therefore contains a linkage arrangement 3 which links an additional function ZSF to the m-sequence.
- the m-sequence becomes m multiplicative with a cosine function
- the ratio between the first term (cosine component) and the second term (constant component) in the second square bracket of the equation (Gl-5) determines the height ratio of the spectral components according to FIG. 3.
- evaluation frequencies AW1 ... AW10 frequencies are used as evaluation frequencies AW1 ... AW10 frequencies according to the regulation
- the test signal M 1 (FIG. 1) is fed to a data transmission link 4 to be examined, which has a weight function or transfer function h (t) to be determined in the time domain or H (jw) in the frequency domain.
- h (t) to be determined in the time domain or H (jw) in the frequency domain.
- H (jw) of the transmission link 4 converts the test signal M 1 to G, according to
- G (jw) is the output signal of the transmission link 4. As explained in more detail below, this can be further evaluated in addition to determining transmission properties of the data transmission path 4.
- the non-linear part can be approximated by a polynomial.
- the transfer function of the transmission link 4 can z. B. have a quadratic portion, which also influences the test signal M ', so that on the line output side a received output signal M "with a spectrum according to the convolution
- the position of the additional spectral components SA1 ... SAIO depends directly on the choice for w according to (Gl-7) and on the term of the polynomial describing the non-linearity. With a different choice for w, or for example when considering a portion of higher power (eg the cubic portion), corresponding statements of the nonlinearity function can of course be obtained.
- the additional spectral components SAl ... SAIO are each at the evaluation frequencies AW1 ... AW10 and thus allow an immediate and simple evaluation. In the present case, the evaluation reveals a considerable non-linearity of the transmission link 4 under investigation.
- spectrum G (jw) at the exit of the transmission link 4 can be (FIG. 1) by convolution with the time-inverse test signal M 1 in a cross-correlator 5 and subsequent Fourier transformation in a device 6, the transfer function H (jw) is determined directly and fed to a display device 8 via a data bus 7.
- the determined dimension V for the non-linearity of the transmission path 4 can - z. B. when exceeding a permissible maximum - can be used directly to suppress the display of the transfer function or at least output an output signal indicating the restricted quality of the transfer function determined.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93903156A EP0628170B1 (de) | 1992-02-26 | 1993-02-03 | Verfahren zum erkennen eines nichtlinearen verhaltens einer zu untersuchenden digitalen daten-übertragungsstrecke |
DE59300829T DE59300829D1 (de) | 1992-02-26 | 1993-02-03 | Verfahren zum erkennen eines nichtlinearen verhaltens einer zu untersuchenden digitalen daten-übertragungsstrecke. |
US08/295,650 US5555507A (en) | 1992-02-26 | 1993-02-03 | Method for detecting non-linear behavior in a digital data transmission path to be examined |
NO943154A NO943154D0 (no) | 1992-02-26 | 1994-08-25 | Fremgangsmåte til deteksjon av ikke-lineær oppförsel i digital datatransmisjonslinje som skal testes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4206454A DE4206454C1 (de) | 1992-02-26 | 1992-02-26 | |
DEP4206454.6 | 1992-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993017348A1 true WO1993017348A1 (de) | 1993-09-02 |
Family
ID=6452979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1993/000109 WO1993017348A1 (de) | 1992-02-26 | 1993-02-03 | Verfahren zum erkennen eines nichtlinearen verhaltens einer zu untersuchenden digitalen daten-übertragungsstrecke |
Country Status (9)
Country | Link |
---|---|
US (1) | US5555507A (de) |
EP (1) | EP0628170B1 (de) |
AT (1) | ATE129575T1 (de) |
AU (1) | AU3448193A (de) |
CA (1) | CA2130895A1 (de) |
DE (2) | DE4206454C1 (de) |
DK (1) | DK0628170T3 (de) |
NO (1) | NO943154D0 (de) |
WO (1) | WO1993017348A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5731993A (en) * | 1996-09-09 | 1998-03-24 | Hughes Electronics | Nonlinear amplifier operating point determination system and method |
DE19654740C2 (de) * | 1996-12-30 | 1999-05-06 | Holger Mueller | Meßverfahren zur Vierpolanalyse mit hoher Bandbreite |
US6115726A (en) * | 1997-10-03 | 2000-09-05 | Kromos Technology, Inc. | Signal processor with local signal behavior |
DE59814107D1 (de) * | 1998-03-27 | 2007-11-29 | Ascom Schweiz Ag | Verfahren und Vorrichtung zur Beurteilung der Übertragungsqualität |
DE19846870C1 (de) * | 1998-10-12 | 2001-01-25 | Peter Peyerl | Verfahren zur Bestimmung der Impulsantwort eines breitbandigen linearen Systems und Meßanordnung zur Durchführung des Verfahrens |
US8742777B2 (en) * | 2010-12-29 | 2014-06-03 | The Board Of Trustees Of The University Of Alabama For And On Behalf Of The University Of Alabama | Method and system for testing an electric circuit |
EP3396398B1 (de) * | 2017-04-27 | 2020-07-08 | Rohde & Schwarz GmbH & Co. KG | Signalkorrekturverfahren, system zur korrektur eines messsignals sowie oszilloskop |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1160271A (en) * | 1965-07-28 | 1969-08-06 | Sperry Rand Ltd | Testing the Response of Servo Systems |
DE2637775A1 (de) * | 1975-08-27 | 1977-03-10 | Hewlett Packard Co | Verfahren und vorrichtung zum messen von uebertragungsfunktionen |
AT380960B (de) * | 1979-06-29 | 1986-08-11 | Felten & Guilleaume Carlswerk | Verfahren und schaltungsanordnung zur selektiven daempfungsmessung in niederfrequenz-uebertragungs- systemen |
DE2849119C2 (de) * | 1978-11-13 | 1989-01-12 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
WO1992017949A1 (de) * | 1991-03-27 | 1992-10-15 | Siemens Aktiengesellschaft | Verfahren zum ermitteln der übertragungseigenschaften einer elektrischen leitung |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3689884A (en) * | 1970-12-31 | 1972-09-05 | Gen Electric | Digital correlator for calculating figure of merit of communication transmission system |
US3866217A (en) * | 1972-12-26 | 1975-02-11 | Currier Smith Corp | Monitoring transmission link by comparing pseudorandom signals |
GB2081913B (en) * | 1979-12-14 | 1983-08-03 | Hewlett Packard Ltd | Noise margin measurement and error probability prediction |
JPS5744339A (en) * | 1980-08-29 | 1982-03-12 | Hitachi Ltd | Signal processing system |
DE3918340A1 (de) * | 1989-06-06 | 1990-12-13 | Thomson Brandt Gmbh | Verfahren zur signalentzerrung |
US5054035A (en) * | 1989-12-21 | 1991-10-01 | At&T Bell Laboratories | Digital signal quality evaluation circuit using synchronization patterns |
DE4014766A1 (de) * | 1990-04-19 | 1992-01-09 | Siemens Ag | Verfahren zum ermitteln von qualitaetsparametern einer uebertragungsstrecke fuer digitale datenstroeme mit zellenstruktur |
US5371760A (en) * | 1993-04-28 | 1994-12-06 | Telesis Technologies Laboratory | Method and apparatus for measuring the impulse response of a radio channel |
-
1992
- 1992-02-26 DE DE4206454A patent/DE4206454C1/de not_active Expired - Fee Related
-
1993
- 1993-02-03 US US08/295,650 patent/US5555507A/en not_active Expired - Lifetime
- 1993-02-03 EP EP93903156A patent/EP0628170B1/de not_active Expired - Lifetime
- 1993-02-03 AU AU34481/93A patent/AU3448193A/en not_active Abandoned
- 1993-02-03 DK DK93903156.3T patent/DK0628170T3/da active
- 1993-02-03 AT AT93903156T patent/ATE129575T1/de active
- 1993-02-03 DE DE59300829T patent/DE59300829D1/de not_active Expired - Fee Related
- 1993-02-03 WO PCT/DE1993/000109 patent/WO1993017348A1/de active IP Right Grant
- 1993-02-03 CA CA002130895A patent/CA2130895A1/en not_active Abandoned
-
1994
- 1994-08-25 NO NO943154A patent/NO943154D0/no unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1160271A (en) * | 1965-07-28 | 1969-08-06 | Sperry Rand Ltd | Testing the Response of Servo Systems |
DE2637775A1 (de) * | 1975-08-27 | 1977-03-10 | Hewlett Packard Co | Verfahren und vorrichtung zum messen von uebertragungsfunktionen |
DE2849119C2 (de) * | 1978-11-13 | 1989-01-12 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
AT380960B (de) * | 1979-06-29 | 1986-08-11 | Felten & Guilleaume Carlswerk | Verfahren und schaltungsanordnung zur selektiven daempfungsmessung in niederfrequenz-uebertragungs- systemen |
WO1992017949A1 (de) * | 1991-03-27 | 1992-10-15 | Siemens Aktiengesellschaft | Verfahren zum ermitteln der übertragungseigenschaften einer elektrischen leitung |
Also Published As
Publication number | Publication date |
---|---|
AU3448193A (en) | 1993-09-13 |
DK0628170T3 (da) | 1996-03-04 |
DE4206454C1 (de) | 1993-04-29 |
NO943154L (no) | 1994-08-25 |
US5555507A (en) | 1996-09-10 |
EP0628170A1 (de) | 1994-12-14 |
DE59300829D1 (de) | 1995-11-30 |
ATE129575T1 (de) | 1995-11-15 |
CA2130895A1 (en) | 1993-08-27 |
EP0628170B1 (de) | 1995-10-25 |
NO943154D0 (no) | 1994-08-25 |
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