EP1063799B1 - Procédé de mesure pour réseaux monofréquence et dispositif afférent - Google Patents

Procédé de mesure pour réseaux monofréquence et dispositif afférent Download PDF

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Publication number
EP1063799B1
EP1063799B1 EP99810552A EP99810552A EP1063799B1 EP 1063799 B1 EP1063799 B1 EP 1063799B1 EP 99810552 A EP99810552 A EP 99810552A EP 99810552 A EP99810552 A EP 99810552A EP 1063799 B1 EP1063799 B1 EP 1063799B1
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EP
European Patent Office
Prior art keywords
synchronization character
received
impulse response
channel impulse
signals
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.)
Expired - Lifetime
Application number
EP99810552A
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German (de)
English (en)
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EP1063799A1 (fr
Inventor
Christian Patry
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Swisscom AG
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Swisscom AG
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Publication date
Application filed by Swisscom AG filed Critical Swisscom AG
Priority to DE59906593T priority Critical patent/DE59906593D1/de
Priority to AT99810552T priority patent/ATE247348T1/de
Priority to EP99810552A priority patent/EP1063799B1/fr
Publication of EP1063799A1 publication Critical patent/EP1063799A1/fr
Application granted granted Critical
Publication of EP1063799B1 publication Critical patent/EP1063799B1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12—Arrangements for observation, testing or troubleshooting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the present invention relates to a measuring method for single-frequency networks and suitable devices.
  • the present invention relates Invention a measuring method and apparatus suitable for Single-frequency networks in which single-frequency networks modulated several transmitters Send out signals on the same carrier frequency, which modulated signals correspond to digital data packets, each said data packet an equal first sync character and a second sync character with transmitter identification included therein.
  • SFN Single Frequency Network
  • DAB Digital Audio Broadcasting
  • DAS Digital Audio Broadcasting
  • this objective is achieved by the achieves the present invention, in particular, that in the measuring method, in which the modulated signals in a centralized measuring device arrangement received and demodulated based on the demodulated Signals a channel impulse response is determined by the temporal Sequence and the amplitude strength of received first synchronization character by comparing with a first reference sync character is determined, and that amplitude peaks of the particular channel impulse response be assigned to a transmitter, for each received second Synchronization characters from different second reference synchronization characters, each containing a different transmitter identification, the one with the greatest agreement is determined and the one contained therein Sender identification is assigned to that amplitude peak, the listened to the respective received second synchronization character.
  • this measuring method is in particular that for everyone Transmitter in the receiving area from the specific impulse response, the amplitude strength of the received signal and the relative reception time in relation be determined on the received signals from the other stations can, with each amplitude peak of the particular channel impulse response the responsible transmitter can be assigned, and in particular also possible is amplitude peaks, which result from reflected signals, be identified and assigned to the responsible transmitter.
  • Another advantage is that this measurement method during the regular operation of the relevant single-frequency network can and must be sent out no special test data. This Measurement method thus allows the received in the examined receiving area Transmitter based on the results obtained by the measurement method to synchronize, especially without sending special test data to have to.
  • received modulated Signals demodulated by means of a quadrature demodulator and the demodulated Signals recorded in a transient recorder In a preferred embodiment, received modulated Signals demodulated by means of a quadrature demodulator and the demodulated Signals recorded in a transient recorder.
  • reading at discrete times has the advantage that the subsequent processing of the read demodulated Signals can be made simpler than the processing of continuous recorded signals.
  • continuous reading the demodulated signals temporary effects, such as reflections mobile objects, easier to be excluded.
  • the invention relates also on a suitable measuring device arrangement and on a computer-readable medium containing coded data that is a for the control of the measuring device arrangement suitable computer program represent.
  • FIG. 1 shows a block diagram, which schematically shows several Sender of a single frequency network and a measuring device arrangement consisting from a measuring receiver with demodulator, a transient recorder and a control computer.
  • Figure 2 shows schematically a data packet, which in addition to information characters Also includes a first and a second synchronization character.
  • the reference numerals S1, S2 and S3 refer to schematically illustrated transmitter (transmitter) of a single-frequency network, which emit modulated signals at the same carrier frequency.
  • the sent out modulated signals correspond in particular to digital data packets, For example, DAB data packets (Digital Audio Broadcasting), the for example, according to a COFDM method (Coded Orthogonal Frequency Division multiplex) or according to another suitable modulation method be modulated.
  • DAB data packets Digital Audio Broadcasting
  • COFDM method Coded Orthogonal Frequency Division multiplex
  • a DAB data packet 7 is included next to Information symbol 73, a first synchronization character 72, a so-called SYNC symbol and a second synchronization character 71, a so-called NULL icon.
  • the SYNC symbol 72 which does not change and is identical for all transmitted DAB data packets 7, is for the exact Synchronization of a receiver used.
  • the NULL symbol 71 is for uses coarse synchronization and contains station-specific information, used in particular for the identification of a transmitter S1, S2, S3 (Transmitter Identification Information, TII).
  • the measuring receiver 2 is, for example, a commercial measurement receiver, the one sufficient has large bandwidth, for example, a bandwidth of at least 1.5 MHz.
  • the measuring receiver shown schematically in FIG 2 also comprises a demodulator 21, for example a quadrature demodulator, which demodulates the received radio signals.
  • the output signals of the measuring receiver 2, respectively of the demodulator 21, namely the in-phase signal I and the phase-shifted quadrature signal Q are directly, for example by means of coaxial cables to a commercially available transient recorder 3, for example a digital oscilloscope, connected, where the demodulated signals recorded and digitized become.
  • the measuring receiver 2 and the transient recorder 3 are connected via a suitable bus 4, for example an IEEE-488 bus, with a control computer 5 connected, for example, a commercial personal computer, of the necessary software and hardware components for accessing and the communication via the bus 4 has.
  • a suitable bus 4 for example an IEEE-488 bus
  • a control computer 5 connected, for example, a commercial personal computer, of the necessary software and hardware components for accessing and the communication via the bus 4 has.
  • the control computer 5 comprises a programmed control module, which is executed in a processor of the control computer 5 to the Measuring receiver 2, respectively the transient recorder 3, via the bus 4 to control, for example, to measurement parameters such as frequency and bandwidth set, and about the bus 4 from the transient recorder 3 recorded demodulated and digitized signals to read.
  • this reading process is continuous or discrete Times can be done, which for example by the user of the measuring device arrangement 1 as a selectable option via a GUI user interface (Graphical User Interface) of the control module can be set.
  • GUI user interface Graphic User Interface
  • the control computer 5 includes a channel impulse response determination module 51, preferably a programmed software module, which in a processor of the control computer 5 is executed and which based on the demodulated signals read from the transient recorder 3 a channel impulse response 53 determines which, for example, on the screen of the control computer 5 is shown in the figure 1.
  • the channel impulse response determination module 51 determines the channel impulse response 53 by that in the demodulated and digitized read by the transient recorder 3 Signals included SYNC symbols 72 (measured SYNC symbols 72) with a reference sync symbol for SYNC symbols 72, that is a reference SYNC symbol.
  • the channel impulse response determination module 51 determined, for example, from the ratio of a measured SYNC symbol 72 to the reference SYNC symbol, the Amplitude strength of the respective measured SYNC symbol 72.
  • the Channel impulse response 53 becomes the amplitude magnitudes of the measured SYNC symbols 72 according to their time sequence, that is under consideration the delay times between the individual measured SYNC symbols 72, shown as amplitude peaks.
  • the channel impulse response thus obtained So represents a temporal sequence of amplitude peaks, where each amplitude peak shown represents the relative amplitude strength of one of a Transmitter S1, S2, S3 signal received and the temporal Sequence of the illustrated amplitude peaks, the delay times between represents the reception of these signals.
  • the control computer 5 also includes an amplitude peak identification module 52, preferably a programmed software module, which is executed in a processor of the control computer 5 and which based on the demodulated read by the transient recorder 3 Signals for the particular amplitude peaks of the channel impulse response 53 the responsible for this transmitter S1, S2, S3 determined.
  • the amplitude peak identification module 52 is different from a database Reference sync separator for NULL symbols 71, that is Reference NULL symbols, which transmitter-specific information, in particular Transmitter identification information (TII), from various transmitters S1, S2, S3, or the amplitude peak identification module 52 created these different reference NULL symbols by making the necessary ones refers to station-specific information from the database.
  • TII Transmitter identification information
  • Database with the various prepared reference NULL symbols, respectively with the various station specific information is located in Control computer 5 or accessible to the control computer 5 on one separate computer.
  • the station-specific reference NULL symbols, or the transmitter-specific information for example, too be assigned to geographical areas, for example by means of geographical Coordinates, so that not unnecessary transmitters are taken into account, for example, far out of the receiving area to be examined are located.
  • the transmitter-specific reference NULL symbols, respectively the station-specific information is updated in the database, for example, from a suitable service center via data transfer via a telecommunications network, manually via a suitable user interface or automatically by a dedicated detection module of the Control Computer 5.
  • the detection module is preferably a programmed one Software module, which in a processor of the control computer.
  • the demodulated in the read from the transient recorder 3 and ZERO symbols 71 are from the amplitude peak identification module 52 compared with the transmitter-specific reference NULL symbols.
  • the Amplitude peak identification module 52 determines for each measured ZERO symbol 71 is the transmitter-specific reference NULL symbol that uses the greatest agreement with the respective measured ZERO symbol 71 has, for example by means of a suitable correlation function.
  • Transmitter identification information may then be provided by the amplitude spike identification module 52 each a respective measured NULL symbol 71, and hence the associated measured SYNC symbol 72, respectively the particular associated with this measured SYNC symbol 72 Amplitude peak of the channel impulse response 53 are assigned.
  • the determined Sender identification can also be used, for example, in graphic representation of the channel impulse response 53 for each amplitude peak.
  • the transmitters S1, S2, S3 in the examined receiving area be synchronized by, for example, certain transmitters S1, S2, S3 be provided with a delay factor by which delay factor Signals emitted by these certain transmitter S1, S2, S3 delayed in time become.
  • the measuring device arrangement 1, in particular the control computer 5, for example via a Telecommunications network with the transmitters S1, S2, S3 or with for these stations S1, S2, S3 control units to connect and the control computer 5 also equipped with a programmed synchronization module, so that the transmitter S1, S2, S3 of a single frequency network in the examined Receiving area directly from the measuring device 1 from can be synchronized.
  • the emitted signals receive simultaneously at several geographically distributed measuring points, for example, with a plurality of measuring receivers 2 and transient recorders 3, which is connected to the control computer 5 via suitable connections are.
  • the described measuring method and the described measuring device arrangement 1 can be during installation or during operation single-frequency networks, in particular DAB networks, to tune the network, to identify and resolve synchronization issues and / or used to monitor individual transmitters S1, S2, S3.
  • single-frequency networks in particular DAB networks
  • foreign stations that send in the same frequency range and for example, operated by an operator of another single frequency network are detected, detected, identified and in the synchronization of the transmitter S1, S2, S3 can be taken into account, so that their disturbing effect can be eliminated.
  • measuring device arrangements 1 From the economic point of view, it is particular interesting to sell complete measuring device arrangements 1 to rent or operate as a service to operators of single-frequency networks. Since the measuring device arrangement 1 of commercially available hardware components, it is particularly interesting to have one or more several data carriers with programmed software modules stored thereon, in particular, a described control module, a channel impulse response determination module 51, an amplitude peak identification module 52 and optionally a synchronization module and a detection module, too sell or distribute under license fees, so as to the inventive Performing measuring procedures with commercially available hardware components.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Claims (11)

  1. Procédé de mesure pour réseaux monofréquence, réseaux monofréquence dans lesquels plusieurs émetteurs (S1, S2, S3) émettent des signaux modulés sur la même fréquence porteuse, signaux modulés qui correspondent à des paquets de données numériques (7), chaque paquet de données (7) comprenant un premier signe identique de synchronisation (72) et un second signe de synchronisation (71) contenant l'identification d'émetteur, procédé de mesure dans lequel lesdits signaux modulés sont reçus et démodulés dans un dispositif de mesure centralisé (1), caractérisé    en ce qu'en se basant sur les signaux démodulés, une réponse d'impulsion de canal (53) est définie dans le fait que la séquence temporelle et l'intensité d'amplitude desdits premiers signes de synchronisation (72) sont définies par comparaison avec un premier signe de synchronisation de référence, et
       en ce que des pics d'amplitude de la réponse définie d'impulsion de canal (53) sont associés à un dit émetteur (S1, S2, S3) dans le fait que pour chaque second signe de synchronisation (71) issu de différents seconds signes de synchronisation de référence, seconds signes de synchronisation de référence qui comprennent une identification d'émetteur différente, ledit second signe de synchronisation de référence étant défini avec la plus grande concordance et l'identification d'émetteur contenue étant associée audit pic d'amplitude qui est associé audit second signe de synchronisation reçu concerné (71).
  2. Procédé selon la revendication 1, caractérisé en ce que desdits signaux modulés reçus sont démodulés au moyen d'un démodulateur à quadrature (21) et lesdits signaux démodulés sont recueillis dans un enregistreur transitoire (3).
  3. Procédé selon la revendication 2, caractérisé en ce que desdits signaux démodulés recueillis sont lus à des moments discrets par un ordinateur de contrôle (5).
  4. Procédé selon la revendication 2, caractérisé en ce que desdits signaux recueillis démodulés sont lus en continu par un ordinateur de contrôle (5).
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que lesdits paquets de données (7) sont des paquets de données DAB (Digital Audio Broadcasting = Diffusion Audio numérique).
  6. Dispositif de mesure (1) pour des réseaux monofréquence, réseaux monofréquence dans lesquels plusieurs émetteurs (S1, S2, S3) émettent des signaux modulés sur la même fréquence porteuse, signaux modulés qui correspondent à des paquets de données numériques (7), chaque paquet de données (7) comprenant un premier signe identique de synchronisation (72) et un second signe de synchronisation (71) contenant l'identification d'émetteur, dispositif de mesure (1) contenant un récepteur de mesure (2) et un démodulateur (21) au moyen desquels desdits signaux modulés sont reçus et démodulés, caractérisé    en ce qu'il comprend un module de définition de réponse d'impulsion de canal (51) qui en se basant sur les signaux démodulés définit une réponse d'impulsion de canal (53, dans le fait qu'il définit la séquence temporelle et l'intensité d'amplitude de dits premiers signes de synchronisation (72) par comparaison avec un premier signe de synchronisation de référence et
       en ce qu'il comprend un module d'identification de pics d'amplitude (52), qui associe des pics d'amplitude de la réponse définie d'impulsion de canal (53) à un dit émetteur (S1, S2, S3), dans le fait que pour chaque second signe reçu de synchronisation (71) issu de différents seconds signes de synchronisation de référence, seconds signes de synchronisation de référence qui comprennent une identification d'émetteur différente, ledit second signe de synchronisation de référence étant défini avec la plus grande concordance et l'identification d'émetteur contenue étant associée audit pic d'amplitude qui est associé audit second signe de synchronisation reçu concerné (71).
  7. Dispositif de mesure (1) selon la revendication 6, caractérisé en ce que ledit démodulateur (21) est un démodulateur à quadrature et en ce q'il comprend un enregistreur transitoire (3) qui enregistre les signaux démodulés.
  8. Dispositif de mesure (1) selon la revendication 7, caractérisé en ce qu'il comprend un ordinateur de commande (5) qui lit les signaux recueillis démodulés à des moments discrets.
  9. Dispositif de mesure (1) selon la revendication 7, caractérisé en ce qu'il comprend un ordinateur de commande (5) qui lit en continu des signaux démodulés réceptionnés.
  10. Dispositif de mesure (1) selon l'une des revendications 6 à 9, caractérisé en ce que lesdits paquets de données (7) sont des paquets de données DAB.
  11. Support de données lisible par ordinateur qui contient des données codées, qui représentent un programme informatique, programme informatique qui permet de commander un ordinateur de contrôle (5) d'un dispositif de mesure (1) selon les revendications 6 à 10 de sorte que ledit ordinateur de contrôle (5) établit des paramètres de mesure d'un récepteur de mesure (2), émetteur de mesure (2) qui reçoit et démodule des signaux modulés, signaux modulés qui correspondent à des paquets de données numériques (7) et qui sont émis par plusieurs émetteurs (S1, S2, S3) d'un réseau monofréquence sur la même fréquence porteuse, chaque paquet de données (7) comprenant un premier signe identique de synchronisation (72) et un second signe de synchronisation (71) contenant l'identification d'émetteur et en ce que ledit ordinateur de contrôle (5) reçoit desdits signaux démodulés, caractérisé    en ce que ledit programme d'ordinateur comprend un module de définition de réponse d'impulsion de canal (51) qui pilote ledit ordinateur de contrôle (5) de sorte qu'il définit en se basant sur les signaux démodulés une réponse d'impulsion de canal (53) dans le fait qu'il définit la séquence temporelle et l'intensité d'amplitude desdits premiers signes de synchronisation (72) par comparaison avec un premier signe de synchronisation de référence, et
       en ce que ledit programme d'ordinateur comprend un module d'identification de pics d'amplitude (52), qui pilote ledit ordinateur de contrôle (5) de sorte qu'il associe des pics d'amplitude de la réponse définie d'impulsion de canal à un dit émetteur (S1, S2, S3) dans le fait que pour chaque second signe de synchronisation (71) issu de différents seconds signes de synchronisation de référence, seconds signes de synchronisation de référence qui comprennent une identification d'émetteur différente, ledit second signe de synchronisation de référence étant défini avec la plus grande concordance et l'identification d'émetteur contenue étant associée audit pic d'amplitude qui est associé audit second signe de synchronisation reçu concerné (71).
EP99810552A 1999-06-22 1999-06-22 Procédé de mesure pour réseaux monofréquence et dispositif afférent Expired - Lifetime EP1063799B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59906593T DE59906593D1 (de) 1999-06-22 1999-06-22 Messverfahren für Einfrequenznetze und dafür geeignete Vorrichtungen
AT99810552T ATE247348T1 (de) 1999-06-22 1999-06-22 Messverfahren für einfrequenznetze und dafür geeignete vorrichtungen
EP99810552A EP1063799B1 (fr) 1999-06-22 1999-06-22 Procédé de mesure pour réseaux monofréquence et dispositif afférent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99810552A EP1063799B1 (fr) 1999-06-22 1999-06-22 Procédé de mesure pour réseaux monofréquence et dispositif afférent

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EP1063799A1 EP1063799A1 (fr) 2000-12-27
EP1063799B1 true EP1063799B1 (fr) 2003-08-13

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10342040A1 (de) * 2003-09-11 2005-04-07 Rohde & Schwarz Gmbh & Co Kg Verfahren zur Überwachung der Zeitsynchronität von Sendern in einem Gleichwellennetz
DE10354468A1 (de) 2003-11-21 2005-06-23 Rohde & Schwarz Gmbh & Co. Kg Verfahren und Vorrichtung zur Überwachung der Trägerfrequenzstabilität von Sendern in einem Gleichwellennetz
JP4216273B2 (ja) * 2005-07-29 2009-01-28 アンリツ株式会社 デジタル放送信号評価装置
FR2891427B1 (fr) * 2005-09-23 2007-11-23 Tdf Sa Procede de diffusion de donnees permettant de mesurer la synchronisation d'emetteurs, systeme, emetteur et programme correspondants.
JP4551889B2 (ja) * 2006-09-14 2010-09-29 株式会社東芝 デジタル放送システムとこのシステムに用いられる放送装置及び監視装置
FR2927756B1 (fr) * 2008-02-19 2010-06-18 Tdf Reseau de transmission synchrone de donnees et procede de surveillance d'un tel reseau.
FR2937202B1 (fr) * 2008-10-15 2011-04-08 Tdf Systeme de surveillance d'un reseau de transmission synchrone

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138770A1 (de) * 1991-11-26 1993-05-27 Daimler Benz Ag Verfahren zur digitalen datenuebertragung im nullsymbol des cofdm-modulationsverfahrens
GB2282300B (en) * 1993-09-22 1997-10-22 Northern Telecom Ltd Communications system and receiver devices therefor

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DE59906593D1 (de) 2003-09-18
ATE247348T1 (de) 2003-08-15
EP1063799A1 (fr) 2000-12-27

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