EP1063799A1 - Measuring method for single frequency network and apparatus therefor - Google Patents

Measuring method for single frequency network and apparatus therefor Download PDF

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Publication number
EP1063799A1
EP1063799A1 EP99810552A EP99810552A EP1063799A1 EP 1063799 A1 EP1063799 A1 EP 1063799A1 EP 99810552 A EP99810552 A EP 99810552A EP 99810552 A EP99810552 A EP 99810552A EP 1063799 A1 EP1063799 A1 EP 1063799A1
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EP
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Prior art keywords
synchronization
received
signals
impulse response
channel impulse
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EP99810552A
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German (de)
French (fr)
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EP1063799B1 (en
Inventor
Christian Patry
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Swisscom AG
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Swisscom AG
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Priority to AT99810552T priority Critical patent/ATE247348T1/en
Priority to DE59906593T priority patent/DE59906593D1/en
Priority to EP99810552A priority patent/EP1063799B1/en
Publication of EP1063799A1 publication Critical patent/EP1063799A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65Arrangements characterised by transmission systems for broadcast
    • H04H20/67Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12Arrangements for observation, testing or troubleshooting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/18Arrangements for synchronising broadcast or distribution via plural systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H2201/00Aspects of broadcast communication
    • H04H2201/10Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20Aspects 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 concerns Invention a measuring method and devices suitable therefor 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 named data packet an equal first synchronization character and a second synchronization character with included transmitter identification.
  • SFN single frequency networks
  • DAB Digital Audio Broadcasting
  • this goal is achieved by the present invention achieved in particular in that in the measuring method, in which the modulated signals in a centralized measuring device arrangement be received and demodulated based on the demodulated ones Signals a channel impulse response is determined by the temporal Sequence and the amplitude strength of received first synchronization characters by comparing with a first reference synchronization character is determined, and that amplitude peaks of the determined channel impulse response can be assigned to a transmitter by for every second received Synchronization characters from different second reference synchronization characters, which each contain a different transmitter identification, the one with the greatest correspondence is determined and the one contained therein Transmitter identification is assigned to that amplitude peak that listened to the second synchronization character received.
  • this measuring method provides the advantages of this measuring method. That for everyone Transmitter in the reception area determines the amplitude strength from the determined impulse response of the received signal as well as the relative reception time in relation on the signals received from the other transmitters can, with each amplitude peak of the particular channel impulse response responsible station can be assigned, and in particular it amplitude peaks resulting from reflected signals are also possible, to identify and assign to the responsible station.
  • Another advantage is that this measurement method can be used during the regular operation of the single-frequency network in question can and no special test data have to be sent out. This The measurement method thus enables those received in the area under investigation Transmitter based on the results obtained from the measurement process to synchronize, especially without sending out special test data to have to.
  • received ones are modulated Signals demodulated by means of a quadrature demodulator and the demodulated Signals recorded in a transient recorder.
  • Different demodulated versions are included Signals at discrete times or continuously from one Control computer read. Reading at discrete points in particular has the advantage that the subsequent processing of the read demodulated Signals can be made easier than processing continuously detected signals. On the other hand, when reading continuously the demodulated signals have temporary effects, for example reflections mobile objects, easier to be excluded.
  • the invention relates also on a suitable measuring device arrangement and a computer-readable disk that contains encoded data that is for the control of the measuring device arrangement suitable computer program represent.
  • Figure 1 shows a block diagram, which schematically several Transmitter of a single-frequency network and a measuring device arrangement 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 signs also contains a first and a second synchronization character.
  • reference numerals S1, S2 and S3 refer to schematically shown transmitter (transmitter) of a single-frequency network, which Send out modulated signals on the same carrier frequency.
  • the sent out modulated signals correspond in particular to digital data packets, for example DAB (Digital Audio Broadcasting) data packets that for example according to a COFDM (Coded Orthogonal Frequency Division multiplex) or according to another suitable modulation method be modulated.
  • DAB Digital Audio Broadcasting
  • COFDM Coded Orthogonal Frequency Division multiplex
  • a DAB data packet 7 also contains Information symbol 73 a first synchronization symbol 72, a so-called SYNC symbol and a second synchronization symbol 71, a so-called Zero symbol.
  • the SYNC symbol 72 which does not change and is identical for all transmitted DAB data packets 7, for the exact Synchronization of a receiver used.
  • the NULL symbol 71 becomes for the coarse synchronization uses and contains transmitter-specific information, which is used in particular for the identification of a transmitter S1, S2, S3 can be (Transmitter Identification Information, TII).
  • the transmitted data are transmitted Signals directly or as reflection from a reflecting object 6, for example a reflection on a mountain, via the antenna 22 of a measurement receiver 2 of the measuring device arrangement 1 received.
  • the measuring receiver 2 is, for example, a commercially available measuring receiver, which is sufficient has a wide bandwidth, for example a bandwidth of at least 1.5 MHz.
  • the measuring receiver shown schematically in FIG. 1 2 also includes a demodulator 21, for example a quadrature demodulator, which demodulates the received radio signals.
  • the output signals of the measuring receiver 2 or the demodulator 21, namely the in-phase signal I and the phase-shifted quadrature signal Q are directly to one, for example by means of coaxial cables commercially available transient recorder 3, for example a digital oscilloscope, connected where the demodulated signals are recorded and digitized become.
  • the measuring receiver 2 and the transient recorder 3 are over one suitable bus 4, for example an IEEE-488 bus, with a control computer 5 connected, for example a commercially available personal computer, of the necessary software and hardware components for access to and the communication has bus 4.
  • a control computer 5 connected, for example a commercially available personal computer, of the necessary software and hardware components for access to and the communication has bus 4.
  • the control computer 5 comprises a programmed control module, which is executed in a processor of the control computer 5 to the Measurement receiver 2, or the transient recorder 3, via the bus 4 control, for example to measure parameters such as frequency and bandwidth set, and to the recorded via the bus 4 from the transient recorder 3 read demodulated and digitized signals.
  • this reading process is continuous or too discrete Points in time can take place, 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 comprises 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 is based on the demodulated signals read by the transient recorder 3 a channel impulse response 53 determines which example on the screen of the control computer 5 is shown in FIG. 1.
  • the channel impulse response determination module 51 determines the channel impulse response 53 in that the in the demodulated and digitized read by the transient recorder 3 Signals contain SYNC symbols 72 (measured SYNC symbols 72) with a reference synchronization 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 one measured SYNC symbol 72 to the reference SYNC symbol, the Amplitude strength of the relevant measured SYNC symbol 72.
  • the Channel impulse response 53 becomes the amplitude strengths of the measured SYNC symbols 72 according to their chronological order, that is, taking into account the delay times between the individual measured SYNC symbols 72, shown as amplitude peaks.
  • the channel impulse response thus obtained therefore represents a chronological sequence of amplitude peaks, where each amplitude peak shown is the relative amplitude strength one of one Transmitter S1, S2, S3 received signal represents and the temporal Sequence of the amplitude peaks shown 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 determined amplitude peaks of the channel impulse response 53 responsible transmitter S1, S2, S3 determined.
  • the amplitude peak identification module 52 different from a database Reference synchronization characters for NULL symbols 71, that is Reference NULL symbols, which transmitter-specific information, in particular Transmitter identification information (TII) from different transmitters S1, S2, S3 included, or the amplitude peak identification module 52 created these different reference null symbols by doing the necessary source-specific information from the database.
  • TII Transmitter identification information
  • the transmitter-specific reference NULL symbols, or the transmitter-specific information can also be assigned to geographic areas, for example by means of geographic Coordinate information so that transmitters are not unnecessarily taken into account which are, for example, far outside the reception 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 using data transfer via a telecommunications network, manually via a suitable user interface or automatically by a detection module provided for this purpose Control computers 5.
  • the detection module is preferably a programmed one Software module, which is in a processor of the control computer 5 is carried out and which of the Measuring device arrangement 1 received data packets 7 analyzed and the Database on the basis of the data packets 7 received NULL symbols 71, or the transmitter-specific information contained therein, updated.
  • Those in the demodulated read by the transient recorder 3 and digitized signals contain ZERO symbols 71 (measured ZERO symbols 71) are used by the amplitude peak identification module 52 compared with the transmitter-specific reference NULL symbols.
  • the Amplitude peak identification module 52 determined for each measured NULL symbol 71 is the transmitter-specific reference NULL symbol which represents the greatest correspondence with the measured NULL symbol 71 concerned has, for example by means of a correlation function suitable therefor.
  • Transmitter identification information can then be obtained from the peak amplitude identification module 52 each have a relevant measured ZERO symbol 71, and consequently 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 the graphic representation the channel impulse response 53 are reproduced for each amplitude peak.
  • the transmitters S1, S2, S3 can receive information in the examined reception area can be synchronized by, for example, certain transmitters S1, S2, S3 be provided with a delay factor by which delay factor Signals transmitted by these certain transmitters S1, S2, S3 with a time delay become.
  • the measuring device 1, in particular the control computer 5, for example via a Telecommunications network, with the transmitters S1, S2, S3 or with for these transmitters S1, S2, S3 to connect responsible control units and the control computer 5 to be additionally equipped with a programmed synchronization module, so that the transmitters S1, S2, S3 of a single-frequency network in the examined Reception area directly from the measuring device arrangement 1 can be synchronized. It is also possible to send out the signals to receive simultaneously at several geographically distributed measuring points, for example with several measuring receivers 2 and transient recorders 3, which are connected to the control computer 5 via suitable connections are.
  • the measuring method described and the measuring device arrangement described 1 can be used during installation or operation single-frequency networks, in particular DAB networks, for tuning the network, to identify and correct synchronization problems and / or for monitoring individual transmitters S1, S2, S3.
  • single-frequency networks in particular DAB networks
  • the measuring device arrangement 1 also possible third-party transmitters that transmit in the same frequency range and for example operated by an operator of another single-frequency network are detected, identified and in the synchronization of the transmitter S1, S2, S3 can also be taken into account, so that their disruptive effect can be eliminated.
  • measuring device arrangements 1 rent or operate as a service for operators of single-frequency networks. Since the measuring device arrangement 1 consists of commercially available hardware components , it is of course particularly interesting, one or several data carriers with programmed software modules stored on them, in particular a control module described, a channel impulse response determination module 51, an amplitude peak identification module 52 and optionally a synchronization module and a detection module sell or distribute under license fees, so that the inventive Carry out measurement procedures with commercially available hardware components.

Abstract

From each demodulated signal, a channel impulse response (53) is determined. The succession in time, and amplitude of the first synchronization signals received (72, sync) are determined by comparison with a first reference synchronization signal. Amplitude peaks of the determined channel impulse response (53) are allocated to a first transmitter (S1, S2, S3). Each DAB (digital audio broadcasting) packet contains two synchronization signals. The second (71, null) with different transmitter identification, is compared in a similar process, determining second synchronization signals with the greatest agreement from a range of these signals, and attributing amplitude peaks to them. An Independent claim is included for corresponding measurement equipment.

Description

Die vorliegende Erfindung betrifft ein Messverfahren für Einfrequenznetze und dafür geeignete Vorrichtungen. Insbesondere betrifft die vorliegende Erfindung ein Messverfahren und dafür geeignete Vorrichtungen für Einfrequenznetze, in welchen Einfrequenznetzen mehrere Sender modulierte Signale auf der gleichen Trägerfrequenz aussenden, welche modulierten Signale digitalen Datenpaketen entsprechen, wobei jedes genannte Datenpaket ein gleiches erstes Synchronisationszeichen und ein zweites Synchronisationszeichen mit darin enthaltener Senderidentifizierung umfasst.The present invention relates to a measuring method for single-frequency networks and suitable devices. In particular, the present concerns Invention a measuring method and devices suitable therefor 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 named data packet an equal first synchronization character and a second synchronization character with included transmitter identification.

In sogenannten Einfrequenznetzen (Single Frequency Network, SFN), beispielsweise in DAB-Netzen (Digital Audio Broadcasting), senden mehrere Senderstationen die selben Informationen auf der gleichen Trägerfrequenz. Um in einem Empfänger eine genügend gute Empfangsqualität zu erhalten, müssen die von den verschiedenen Sendern ausgesendeten Signale beim Empfänger innerhalb eines bestimmten Zeitintervalls (Guard Interval) empfangen werden können. Es ist folglich notwendig, die Sender untereinander zu synchronisieren.In so-called single frequency networks, SFN), for example in DAB (Digital Audio Broadcasting) networks several transmitter stations have the same information on the same carrier frequency. In order to obtain a sufficiently good reception quality in a receiver, need the signals emitted by the different transmitters at the receiver within a certain time interval (Guard Interval) can be received. It is therefore necessary to send the transmitters to each other to synchronize.

Es ist eine Aufgabe dieser Erfindung, ein neues und besseres Messverfahren für Einfrequenznetze sowie dafür geeignete Vorrichtungen vorzuschlagen, welche insbesondere ermöglichen, dass Sender eines Einfrequenznetzes untereinander synchronisiert werden können.It is an object of this invention, a new and better one Propose measuring methods for single-frequency networks and suitable devices for them, which in particular enable transmitters of a single-frequency network can be synchronized with each other.

Gemäss der vorliegenden Erfindung wird dieses Ziel insbesondere durch die Elemente der unabhängigen Ansprüche erreicht. Weitere vorteilhafte Ausführungsformen gehen ausserdem aus den abhängigen Ansprüchen und der Beschreibung hervor.According to the present invention, this goal is particularly achieved through the elements of the independent claims. More beneficial Embodiments also go from the dependent claims and the description.

In Einfrequenznetzen, in welchen mehrere Sender modulierte Signale auf der gleichen Trägerfrequenz aussenden, und in welchen die modulierten Signale digitalen Datenpaketen entsprechen, die jeweils ein gleiches erstes Synchronisationszeichen und ein zweites Synchronisationszeichen mit darin enthaltener Senderidentifizierung umfassen, wird dieses Ziel durch die vorliegende Erfindung insbesondere dadurch erreicht, dass im Messverfahren, in welchem die modulierten Signale in einer zentralisierten Messvorrichtungsanordnung empfangen und demoduliert werden, basierend auf den demodulierten Signalen eine Kanalimpulsantwort bestimmt wird, indem die zeitliche Abfolge und die Amplitudenstärke von empfangenen ersten Synchronisationszeichen durch Vergleichen mit einem ersten Referenzsynchronisationszeichen bestimmt wird, und dass Amplitudenspitzen der bestimmten Kanalimpulsantwort einem Sender zugeordnet werden, indem für jedes empfangene zweite Synchronisationszeichen aus verschiedenen zweiten Referenzsynchronisationszeichen, die jeweils eine verschiedene Senderidentifizierung enthalten, dasjenige mit der grössten Übereinstimmung bestimmt wird und die darin enthaltene Senderidentifizierung derjenigen Amplitudenspitze zugeordnet wird, die dem betreffenden empfangenen zweiten Synchronisationszeichen zugehört. Die Vorteile dieses Messverfahrens bestehen insbesondere darin, dass für jeden Sender im Empfangsgebiet aus der bestimmten Impulsantwort die Amplitudenstärke des empfangenen Signals sowie die relative Empfangszeit in Bezug auf die von den anderen Sendern empfangenen Signalen bestimmt werden kann, wobei jede Amplitudenspitze der bestimmten Kanalimpulsantwort dem dafür verantwortlichen Sender zugeordnet werden kann, und wobei es insbesondere auch möglich ist Amplitudenspitzen, die von reflektierten Signalen herrühren, zu identifizieren und dem dafür verantwortlichen Sender zuzuordnen. Ein weiterer Vorteil besteht darin, dass dieses Messverfahren während dem regulären Betrieb des betreffenden Einfrequenznetzes durchgeführt werden kann und keine speziellen Testdaten ausgesendet werden müssen. Dieses Messverfahren ermöglicht folglich die im untersuchten Empfangsgebiet empfangenen Sender auf Grund der durch das Messverfahren erhaltenen Resultate zu synchronisieren, insbesondere ohne dabei spezielle Testdaten aussenden zu müssen.In single-frequency networks in which several transmitters have modulated signals transmit on the same carrier frequency, and in which the modulated Signals correspond to digital data packets, each one the same first synchronization character and a second synchronization character with include transmitter identification, this goal is achieved by the present invention achieved in particular in that in the measuring method, in which the modulated signals in a centralized measuring device arrangement be received and demodulated based on the demodulated ones Signals a channel impulse response is determined by the temporal Sequence and the amplitude strength of received first synchronization characters by comparing with a first reference synchronization character is determined, and that amplitude peaks of the determined channel impulse response can be assigned to a transmitter by for every second received Synchronization characters from different second reference synchronization characters, which each contain a different transmitter identification, the one with the greatest correspondence is determined and the one contained therein Transmitter identification is assigned to that amplitude peak that listened to the second synchronization character received. The advantages of this measuring method are that for everyone Transmitter in the reception area determines the amplitude strength from the determined impulse response of the received signal as well as the relative reception time in relation on the signals received from the other transmitters can, with each amplitude peak of the particular channel impulse response responsible station can be assigned, and in particular it amplitude peaks resulting from reflected signals are also possible, to identify and assign to the responsible station. Another advantage is that this measurement method can be used during the regular operation of the single-frequency network in question can and no special test data have to be sent out. This The measurement method thus enables those received in the area under investigation Transmitter based on the results obtained from the measurement process to synchronize, especially without sending out special test data to have to.

In einer bevorzugten Ausführungsvariante werden empfangene modulierte Signale mittels einem Quadraturdemodulator demoduliert und die demodulierten Signale in einem Transientenrecorder aufgenommen.In a preferred embodiment variant, received ones are modulated Signals demodulated by means of a quadrature demodulator and the demodulated Signals recorded in a transient recorder.

In verschiedenen Ausführungsvarianten werden aufgenommene demodulierte Signale zu diskreten Zeitpunkten oder kontinuierlich von einem Control-Computer gelesen. Das Lesen zu diskreten Zeitpunkten hat insbesondere den Vorteil, dass die nachfolgende Verarbeitung der gelesenen demodulierten Signale einfacher gestaltet werden kann als die Verarbeitung von kontinuierlich erfassten Signalen. Andererseits können beim kontinuierlichen Lesen der demodulierten Signale temporäre Effekte, beispielsweise Reflexionen durch mobile Objekte, einfacher ausgeschlossen werden.Different demodulated versions are included Signals at discrete times or continuously from one Control computer read. Reading at discrete points in particular has the advantage that the subsequent processing of the read demodulated Signals can be made easier than processing continuously detected signals. On the other hand, when reading continuously the demodulated signals have temporary effects, for example reflections mobile objects, easier to be excluded.

Neben dem erfindungsgemässen Verfahren bezieht sich die Erfindung auch auf eine dafür geeignete Messvorrichtungsanordnung sowie auf einen Computer-lesbaren Datenträger, der codierte Daten enthält, die ein für die Steuerung der Messvorrichtungsanordnung geeignetes Computer-Programm repräsentieren.In addition to the method according to the invention, the invention relates also on a suitable measuring device arrangement and a computer-readable disk that contains encoded data that is for the control of the measuring device arrangement suitable computer program represent.

Nachfolgend wird eine Ausführung der vorliegenden Erfindung anhand eines Beispieles beschrieben. Das Beispiel der Ausführung wird durch folgende beigelegten Figuren illustriert:An embodiment of the present invention is described below described an example. The example of execution is by The following figures are illustrated:

Figur 1 zeigt ein Blockdiagramm, welches schematisch mehrere Sender eines Einfrequenznetzes sowie eine Messvorrichtungsanordnung bestehend aus einem Messempfänger mit Demodulator, einem Transientenrecorder und einem Control-Computer darstellt.Figure 1 shows a block diagram, which schematically several Transmitter of a single-frequency network and a measuring device arrangement from a measuring receiver with demodulator, a transient recorder and a control computer.

Figur 2 zeigt schematisch ein Datenpaket, welches neben Informationszeichen auch ein erstes und ein zweites Synchronisationszeichen enthält.Figure 2 shows schematically a data packet, which in addition to information signs also contains a first and a second synchronization character.

In der Figur 1 beziehen sich die Bezugsziffern S1, S2 und S3 auf schematisch dargestellte Sender (Transmitter) eines Einfrequenznetzes, welche modulierte Signale auf der gleichen Trägerfrequenz aussenden. Die ausgesendeten modulierten Signale entsprechen insbesondere digitalen Datenpaketen, beispielsweise DAB-Datenpakete (Digital Audio Broadcasting), die beispielsweise gemäss einem COFDM-Verfahren (Coded Orthogonal Frequency Division Multiplex) oder gemäss einem anderen geeigneten Modulationsverfahren moduliert werden. In FIG. 1, reference numerals S1, S2 and S3 refer to schematically shown transmitter (transmitter) of a single-frequency network, which Send out modulated signals on the same carrier frequency. The sent out modulated signals correspond in particular to digital data packets, for example DAB (Digital Audio Broadcasting) data packets that for example according to a COFDM (Coded Orthogonal Frequency Division multiplex) or according to another suitable modulation method be modulated.

Wie in der Figur 2 dargestellt ist, enthält ein DAB-Datenpaket 7 neben Informationszeichen 73 ein erstes Synchronisationszeichen 72, ein sogenanntes SYNC-Symbol und ein zweites Synchronisationszeichen 71, ein sogenanntes NULL-Symbol. Das SYNC-Symbol 72, welches sich nicht ändert und für alle ausgesendeten DAB-Datenpakete 7 identisch ist, wird für die genaue Synchronisation eines Empfängers verwendet. Das NULL-Symbol 71 wird für die Grobsynchronisation verwendet und enthält senderspezifische Informationen, die insbesondere für die Identifizierung eines Senders S1, S2, S3 verwendet werden kann (Transmitter Identification Information, TII). An dieser Stelle sollte darauf hingewiesen werden, dass die für Einfrequenznetze übliche Regel, dass die von mehreren Sendern S1, S2, S3 im gleichen Zeitraum ausgesendeten Informationen identisch sind, durch das gleichbleibende SYNC-Symbol 72 und die Informationszeichen 73 eines DAB-Datenpakets 7 eingehalten aber durch die im NULL-Symbol 71 eines DAB-Datenpakets 7 enthaltenen senderspezifischen Informationen nicht eingehalten wird.As shown in FIG. 2, a DAB data packet 7 also contains Information symbol 73 a first synchronization symbol 72, a so-called SYNC symbol and a second synchronization symbol 71, a so-called Zero symbol. The SYNC symbol 72, which does not change and is identical for all transmitted DAB data packets 7, for the exact Synchronization of a receiver used. The NULL symbol 71 becomes for the coarse synchronization uses and contains transmitter-specific information, which is used in particular for the identification of a transmitter S1, S2, S3 can be (Transmitter Identification Information, TII). At this It should be pointed out that the usual for single frequency networks Rule that those sent by several transmitters S1, S2, S3 in the same period Information is identical due to the constant SYNC symbol 72 and the information characters 73 of a DAB data packet 7 are observed but by those contained in the NULL symbol 71 of a DAB data packet 7 transmitter-specific information is not adhered to.

Wie in der Figur 1 schematisch dargestellt ist, werden die ausgesendeten Signale direkt oder als Reflexion ab einem reflektierenden Objekt 6, beispielsweise eine Reflexion an einem Berg, über die Antenne 22 eines Messempfängers 2 der Messvorrichtungsanordnung 1 empfangen. Der Messempfänger 2 ist beispielsweise ein handelsüblicher Messempfänger, der eine genügend grosse Bandbreite aufweist, beispielsweise eine Bandbreite von mindestens 1.5 MHz. Der in der Figur 1 schematisch dargestellte Messempfänger 2 umfasst zudem einen Demodulator 21, beispielsweise einen Quadraturdemodulator, der die empfangenen Radiosignale demoduliert.As is shown schematically in FIG. 1, the transmitted data are transmitted Signals directly or as reflection from a reflecting object 6, for example a reflection on a mountain, via the antenna 22 of a measurement receiver 2 of the measuring device arrangement 1 received. The measuring receiver 2 is, for example, a commercially available measuring receiver, which is sufficient has a wide bandwidth, for example a bandwidth of at least 1.5 MHz. The measuring receiver shown schematically in FIG. 1 2 also includes a demodulator 21, for example a quadrature demodulator, which demodulates the received radio signals.

Die Ausgangssignale des Messempfängers 2, respektive des Demodulators 21, nämlich das Inphasesignal I und das phasenverschobene Quadratursignal Q werden direkt, beispielsweise mittels Koaxialkabeln, an einen handelsüblichen Transientenrecorder 3, beispielsweise ein digitales Oszilloskop, angeschlossen, wo die demodulierten Signale aufgenommen und digitalisiert werden.The output signals of the measuring receiver 2 or the demodulator 21, namely the in-phase signal I and the phase-shifted quadrature signal Q are directly to one, for example by means of coaxial cables commercially available transient recorder 3, for example a digital oscilloscope, connected where the demodulated signals are recorded and digitized become.

Der Messempfänger 2 und der Transientenrecorder 3 sind über einen geeigneten Bus 4, beispielsweise ein IEEE-488 Bus, mit einem Control-Computer 5 verbunden, beispielsweise ein handelsüblicher Personal Computer, der über die notwendigen Soft- und Hardwarekomponenten für den Zugriff auf und die Kommunikation über den Bus 4 verfügt.The measuring receiver 2 and the transient recorder 3 are over one suitable bus 4, for example an IEEE-488 bus, with a control computer 5 connected, for example a commercially available personal computer, of the necessary software and hardware components for access to and the communication has bus 4.

Der Control-Computer 5 umfasst ein programmiertes Steuermodul, welches in einem Prozessor des Control-Computers 5 ausgeführt wird, um den Messempfänger 2, respektive den Transientenrecorder 3, über den Bus 4 zu steuern, beispielsweise um Messparameter wie Frequenz und Bandbreite zu setzen, und um über den Bus 4 vom Transientenrecorder 3 die aufgenommenen demodulierten und digitalisierten Signale zu lesen. An dieser Stelle sollte erwähnt werden, dass dieser Lesevorgang kontinuierlich oder zu diskreten Zeitpunkten erfolgen kann, was beispielsweise vom Benutzer der Messvorrichtungsanordnung 1 als wählbare Option über eine GUI-Benutzerschnittstelle (Graphical User Interface) des Steuermoduls gesetzt werden kann.The control computer 5 comprises a programmed control module, which is executed in a processor of the control computer 5 to the Measurement receiver 2, or the transient recorder 3, via the bus 4 control, for example to measure parameters such as frequency and bandwidth set, and to the recorded via the bus 4 from the transient recorder 3 read demodulated and digitized signals. At this point mentioned that this reading process is continuous or too discrete Points in time can take place, 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.

Der Control-Computer 5 umfasst ein Kanalimpulsantwort-Bestimmungsmodul 51, vorzugsweise ein programmiertes Softwaremodul, welches in einem Prozessor des Control-Computers 5 ausgeführt wird und welches basierend auf den vom Transientenrecorder 3 gelesenen demodulierten Signalen eine Kanalimpulsantwort 53 bestimmt, welche beispielhaft auf dem Bildschirm des Control-Computers 5 in der Figur 1 dargestellt ist. Das Kanalimpulsantwort-Bestimmungsmodul 51 bestimmt die Kanalimpulsantwort 53 dadurch, dass die in den vom Transientenrecorder 3 gelesenen demodulierten und digitalisierten Signalen enthaltenen SYNC-Symbole 72 (gemessene SYNC-Symbole 72) mit einem Referenzsynchronisationszeichen für SYNC-Symbole 72, das heisst einem Referenz-SYNC-Symbol, verglichen werden. Das Kanalimpulsantwort-Bestimmungsmodul 51 bestimmt, beispielsweise aus dem Verhältnis eines gemessenen SYNC-Symbols 72 zum Referenz-SYNC-Symbol, die Amplitudenstärke des betreffenden gemessenen SYNC-Symbols 72. In der Kanalimpulsantwort 53 werden die Amplitudenstärken der gemessenen SYNC-Symbole 72 gemäss deren zeitlichen Abfolge, das heisst unter Berücksichtigung der Verzögerungszeiten zwischen den einzelnen gemessenen SYNC-Symbolen 72, als Amplitudenspitzen dargestellt. Die so erhaltene Kanalimpulsantwort stellt also eine zeitliche Abfolge von Amplitudenspitzen dar, wobei jede dargestellte Amplitudenspitze die relative Amplitudenstärke eines von einem Sender S1, S2, S3 empfangenen Signals repräsentiert und die zeitliche Abfolge der dargestellten Amplitudenspitzen die Verzögerungszeiten zwischen dem Empfang dieser Signale repräsentiert.The control computer 5 comprises 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 is based on the demodulated signals read by the transient recorder 3 a channel impulse response 53 determines which example on the screen of the control computer 5 is shown in FIG. 1. The channel impulse response determination module 51 determines the channel impulse response 53 in that the in the demodulated and digitized read by the transient recorder 3 Signals contain SYNC symbols 72 (measured SYNC symbols 72) with a reference synchronization 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 one measured SYNC symbol 72 to the reference SYNC symbol, the Amplitude strength of the relevant measured SYNC symbol 72. In the Channel impulse response 53 becomes the amplitude strengths of the measured SYNC symbols 72 according to their chronological order, that is, taking into account the delay times between the individual measured SYNC symbols 72, shown as amplitude peaks. The channel impulse response thus obtained therefore represents a chronological sequence of amplitude peaks, where each amplitude peak shown is the relative amplitude strength one of one Transmitter S1, S2, S3 received signal represents and the temporal Sequence of the amplitude peaks shown the delay times between represents the reception of these signals.

Der Control-Computer 5 umfasst zudem ein Amplitudenspitzen-Identifizierungsmodul 52, vorzugsweise ein programmiertes Softwaremodul, welches in einem Prozessor des Control-Computers 5 ausgeführt wird und welches basierend auf den vom Transientenrecorder 3 gelesenen demodulierten Signalen für die bestimmten Amplitudenspitzen der Kanalimpulsantwort 53 die dafür verantwortlichen Sender S1, S2, S3 bestimmt. Zu diesem Zweck bezieht das Amplitudenspitzen-ldentifizierungsmodul 52 aus einer Datenbank verschiedene Referenzsynchronisationszeichen für NULL-Symbole 71, das heisst Referenz-NULL-Symbole, welche senderspezifische Informationen, insbesondere Senderidentifizierungsinformationen (TII), von verschiedenen Sendern S1, S2, S3 enthalten, oder das Amplitudenspitzen-ldentifizierungsmodul 52 erstellt diese verschiedenen Referenz-NULL-Symbole, indem es die dafür erforderlichen senderspezifischen Informationen aus der Datenbank bezieht. Die Datenbank mit den verschiedenen vorbereiteten Referenz-NULL-Symbolen, respektive mit den verschiedenen senderspezifischen Informationen, befindet sich im Control-Computer 5 oder für den Control-Computer 5 zugänglich auf einem separaten Computer. Die senderspezifischen Referenz-NULL-Symbole, respektive die senderspezifischen Informationen, können beispielsweise auch geografischen Gebieten zugeordnet sein, zum Beispiel mittels geografischen Koordinatenangaben, so dass nicht unnötig Sender mitberücksichtigt werden, die sich beispielsweise weit ausserhalb des zu untersuchenden Empfangsgebietes befinden. Die senderspezifischen Referenz-NULL-Symbole, respektive die senderspezifischen Informationen, werden in der Datenbank aktualisiert, beispielsweise von einer geeigneten Dienstzentrale mittels Datentransfer über ein Telekommunikationsnetz, manuell über eine geeignete Benutzerschnittstelle oder automatisch durch ein dafür vorgesehenes Detektierungsmodul des Control-Computers 5. Das Detektierungsmodul ist vorzugsweise ein programmiertes Softwaremodul, welches in einem Prozessor des Control-Computers 5 ausgeführt wird und welches die im untersuchten Empfangsgebiet von der Messvorrichtungsanordnung 1 empfangenen Datenpakete 7 analysiert und die Datenbank auf Grund der in den empfangenen Datenpaketen 7 enthaltenen NULL-Symbole 71, respektive der darin enthaltenen senderspezifischen Informationen, aktualisiert. Die in den vom Transientenrecorder 3 gelesenen demodulierten und digitalisierten Signalen enthaltenen NULL-Symbole 71 (gemessene NULL-Symbole 71) werden vom Amplitudenspitzen-ldentifizierungsmodul 52 mit den senderspezifischen Referenz-NULL-Symbolen verglichen. Das Amplitudenspitzen-ldentifizierungsmodul 52 bestimmt für jedes gemessene NULL-Symbol 71 das senderspezifische Referenz-NULL-Symbol, das die grösste Übereinstimmung mit dem betreffenden gemessenen NULL-Symbol 71 aufweist, beispielsweise mittels einer dafür geeigneten Korrelationsfunktion. Die in diesen bestübereinstimmenden Referenz-NULL-Symbolen enthaltenen Senderidentifizierungsinformationen können dann vom Amplitudenspitzen-Identifizierungsmodul 52 jeweils einem betreffenden gemessenen NULL-Symbol 71, und folglich dem zugehörigen gemessenen SYNC-Symbol 72, respektive der diesem gemessenen SYNC-Symbol 72 zugehörigen bestimmten Amplitudenspitze der Kanalimpulsantwort 53 zugeordnet werden. Die ermittelte Senderidentifizierung kann beispielsweise auch in der grafischen Repräsentation der Kanalimpulsantwort 53 für jede Amplitudenspitze wiedergegeben werden.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 determined amplitude peaks of the channel impulse response 53 responsible transmitter S1, S2, S3 determined. Related to this purpose the amplitude peak identification module 52 different from a database Reference synchronization characters for NULL symbols 71, that is Reference NULL symbols, which transmitter-specific information, in particular Transmitter identification information (TII) from different transmitters S1, S2, S3 included, or the amplitude peak identification module 52 created these different reference null symbols by doing the necessary source-specific information from the database. Database with the various prepared reference NULL symbols, respectively with the various station-specific information is located in the Control computer 5 or accessible to the control computer 5 on one separate computer. The transmitter-specific reference NULL symbols, or the transmitter-specific information, for example, can also be assigned to geographic areas, for example by means of geographic Coordinate information so that transmitters are not unnecessarily taken into account which are, for example, far outside the reception 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 using data transfer via a telecommunications network, manually via a suitable user interface or automatically by a detection module provided for this purpose Control computers 5. The detection module is preferably a programmed one Software module, which is in a processor of the control computer 5 is carried out and which of the Measuring device arrangement 1 received data packets 7 analyzed and the Database on the basis of the data packets 7 received NULL symbols 71, or the transmitter-specific information contained therein, updated. Those in the demodulated read by the transient recorder 3 and digitized signals contain ZERO symbols 71 (measured ZERO symbols 71) are used by the amplitude peak identification module 52 compared with the transmitter-specific reference NULL symbols. The Amplitude peak identification module 52 determined for each measured NULL symbol 71 is the transmitter-specific reference NULL symbol which represents the greatest correspondence with the measured NULL symbol 71 concerned has, for example by means of a correlation function suitable therefor. The contained in these best matched reference NULL symbols Transmitter identification information can then be obtained from the peak amplitude identification module 52 each have a relevant measured ZERO symbol 71, and consequently 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 the graphic representation the channel impulse response 53 are reproduced for each amplitude peak.

Auf Grund der mittels dieser Kanalimpulsantwort 53 wiedergegebenen Informationen können die Sender S1, S2, S3 im untersuchten Empfangsgebiet synchronisiert werden, indem beispielsweise gewisse Sender S1, S2, S3 mit einem Verzögerungsfaktor versehen werden, um welchen Verzögerungsfaktor Signale durch diese gewissen Sender S1, S2, S3 zeitlich verzögert ausgesendet werden. Zu diesem Zweck ist es auch möglich, die Messvorrichtungsanordnung 1, insbesondere den Control-Computer 5, beispielsweise über ein Telekommunikationsnetz, mit den Sendern S1, S2, S3 oder mit für diese Sender S1, S2, S3 verantwortlichen Steuereinheiten zu verbinden und den Control-Computer 5 zusätzlich mit einem programmierten Synchronisationsmodul auszustatten, so dass die Sender S1, S2, S3 eines Einfrequenznetzes im untersuchten Empfangsgebiet direkt von der Messvorrichtungsanordnung 1 aus synchronisiert werden können. Es ist auch möglich, die ausgesendeten Signale gleichzeitig an mehreren geografisch verteilten Messpunkten zu empfangen, beispielsweise mit mehreren Messempfängern 2 und Transientenrecordern 3, welche über geeignete Verbindungen an den Control-Computer 5 angeschlossen sind.Due to the reproduced by means of this channel impulse response 53 The transmitters S1, S2, S3 can receive information in the examined reception area can be synchronized by, for example, certain transmitters S1, S2, S3 be provided with a delay factor by which delay factor Signals transmitted by these certain transmitters S1, S2, S3 with a time delay become. For this purpose it is also possible to arrange the measuring device 1, in particular the control computer 5, for example via a Telecommunications network, with the transmitters S1, S2, S3 or with for these transmitters S1, S2, S3 to connect responsible control units and the control computer 5 to be additionally equipped with a programmed synchronization module, so that the transmitters S1, S2, S3 of a single-frequency network in the examined Reception area directly from the measuring device arrangement 1 can be synchronized. It is also possible to send out the signals to receive simultaneously at several geographically distributed measuring points, for example with several measuring receivers 2 and transient recorders 3, which are connected to the control computer 5 via suitable connections are.

Das beschriebene Messverfahren und die beschriebene Messvorrichtungsanordnung 1 können bei der Installation oder während dem Betrieb von Einfrequenznetzen, insbesondere DAB-Netze, zur Abstimmung des Netzes, zur Identifizierung und Behebung von Synchronisationsproblemen und/oder zur Überwachung von einzelnen Sendern S1, S2, S3 eingesetzt werden. An dieser Stelle sollte zudem erwähnt werden, dass durch das beschriebene Messverfahren und durch die beschriebene Messvorrichtungsanordnung 1 auch eventuelle Fremdsender, die im gleichen Frequenzbereich senden und beispielsweise von einem Betreiber eines anderen Einfrequenznetzes betrieben werden, detektiert, identifiziert und bei der Synchronisierung der Sender S1, S2, S3 mitberücksichtigt werden können, so dass deren störende Wirkung eliminiert werden kann.The measuring method described and the measuring device arrangement described 1 can be used during installation or operation single-frequency networks, in particular DAB networks, for tuning the network, to identify and correct synchronization problems and / or for monitoring individual transmitters S1, S2, S3. At this point it should also be mentioned that through the described Measuring method and by the described measuring device arrangement 1 also possible third-party transmitters that transmit in the same frequency range and for example operated by an operator of another single-frequency network are detected, identified and in the synchronization of the transmitter S1, S2, S3 can also be taken into account, so that their disruptive effect can be eliminated.

Vom wirtschaftlichen Standpunkt aus betrachtet ist es insbesondere interessant, vollständige Messvorrichtungsanordnungen 1 zu verkaufen, zu vermieten oder als Dienstleistung für Betreiber von Einfrequenznetzen zu betreiben. Da die Messvorrichtungsanordnung 1 aus handelsüblichen Hardware-Komponenten besteht, ist es natürlich insbesondere interessant, einen oder mehrere Datenträger mit darauf gespeicherten programmierten Softwaremodulen, insbesondere ein beschriebenes Steuermodul, ein Kanalimpulsantwort-Bestimmungsmodul 51, ein Amplitudenspitzen-ldentifizierungsmodul 52 und gegebenenfalls ein Synchronisationsmodul und ein Detektierungsmodul, zu verkaufen oder unter Lizenzgebühren zu vertreiben, um damit das erfindungsgemässe Messverfahren mit handelsüblichen Hardware-Komponenten auszuführen. From an economic point of view, it is special interesting to sell complete measuring device arrangements 1 rent or operate as a service for operators of single-frequency networks. Since the measuring device arrangement 1 consists of commercially available hardware components , it is of course particularly interesting, one or several data carriers with programmed software modules stored on them, in particular a control module described, a channel impulse response determination module 51, an amplitude peak identification module 52 and optionally a synchronization module and a detection module sell or distribute under license fees, so that the inventive Carry out measurement procedures with commercially available hardware components.

Liste der BezugszeichenList of reference numbers

11
MessvorrichtungsanordnungMeasuring device arrangement
22nd
MessempfängerMeasuring receiver
33rd
Transientenrecorder (digitales Oszilloskop)Transient recorder (digital oscilloscope)
44th
Bus (IEEE-488 Bus)Bus (IEEE-488 bus)
55
Control-ComputerControl computer
66
Reflektierendes ObjektReflective object
77
DAB-DatenpaketDAB data packet
2121
Demodulator (Quadraturdemodulator)Demodulator (quadrature demodulator)
2222
Antenneantenna
5151
Kanalimpulsantwort-BestimmungsmodulChannel impulse response determination module
5252
Amplitudenspitzen-ldentifizierungsmodulPeak amplitude identification module
5353
KanalimpulsantwortChannel impulse response
7171
NULL-Symbol (zweites Synchronisationszeichen)NULL symbol (second synchronization character)
7272
SYNC-Symbol (erstes Synchronisationszeichen)SYNC symbol (first synchronization character)
7373
InformationszeichenInformation sign
II.
Inphasesignal In-phase signal
QQ
QuadratursignalQuadrature signal
S1, S2, S3S1, S2, S3
Sender (Transmitter)Transmitter

Claims (11)

Messverfahren für Einfrequenznetze, in welchen Einfrequenznetzen mehrere Sender (S1, S2, S3) modulierte Signale auf der gleichen Trägerfrequenz aussenden, welche modulierten Signale digitalen Datenpaketen (7) entsprechen, wobei jedes genannte Datenpaket (7) ein gleiches erstes Synchronisationszeichen (72) und ein zweites Synchronisationszeichen (71) mit darin enthaltener Senderidentifizierung umfasst, in welchem Messverfahren genannte modulierte Signale in einer zentralisierten Messvorrichtungsanordnung (1) empfangen und demoduliert werden, dadurch gekennzeichnet, dass basierend auf den demodulierten Signalen eine Kanalimpulsantwort (53) bestimmt wird, indem die zeitliche Abfolge und die Amplitudenstärke von empfangenen genannten ersten Synchronisationszeichen (72) durch Vergleichen mit einem ersten Referenzsynchronisationszeichen bestimmt wird, und dass Amplitudenspitzen der bestimmten Kanalimpulsantwort (53) einem genannten Sender (S1, S2, S3) zugeordnet werden, indem für jedes empfangene genannte zweite Synchronisationszeichen (71) aus verschiedenen zweiten Referenzsynchronisationszeichen, welche zweiten Referenzsynchronisationszeichen jeweils eine verschiedene Senderidentifizierung enthalten, das genannte zweite Referenzsynchronisationszeichen mit der grössten Übereinstimmung bestimmt wird und die darin enthaltene Senderidentifizierung der genannten Amplitudenspitze zugeordnet wird, die dem betreffenden genannten empfangenen zweiten Synchronisationszeichen (71) zugehört. Measuring method for single-frequency networks, in which single-frequency networks several transmitters (S1, S2, S3) send out modulated signals on the same carrier frequency, which modulated signals correspond to digital data packets (7), each said data packet (7) having the same first synchronization symbol (72) and a comprises a second synchronization symbol (71) with the transmitter identification contained therein, in which measurement method said modulated signals are received and demodulated in a centralized measuring device arrangement (1), characterized in that that a channel impulse response (53) is determined on the basis of the demodulated signals by determining the chronological sequence and the amplitude strength of received first synchronization characters (72) by comparison with a first reference synchronization character, and that amplitude peaks of the specific channel impulse response (53) are assigned to a transmitter (S1, S2, S3), by for each received said second synchronization symbol (71) from different second reference synchronization symbols, which second reference synchronization symbols each contain a different transmitter identification, with the said second reference synchronization symbol the greatest match is determined and the transmitter identification contained therein is assigned to the said amplitude peak, which belongs to the said second synchronization character (71) in question. Verfahren gemäss Anspruch 1, dadurch gekennzeichnet, dass empfangene genannte modulierte Signale mittels einem Quadraturdemodulator (21) demoduliert werden und die genannten demodulierten Signale in einem Transientenrecorder (3) aufgenommen werden.A method according to claim 1, characterized in that received said modulated signals by means of a quadrature demodulator (21) and the above-mentioned demodulated signals in one Transient recorder (3) can be recorded. Verfahren gemäss Anspruch 2, dadurch gekennzeichnet, dass aufgenommene genannte demodulierte Signale zu diskreten Zeitpunkten von einem Control-Computer (5) gelesen werden. A method according to claim 2, characterized in that mentioned demodulated signals recorded at discrete times of a control computer (5) can be read. Verfahren gemäss Anspruch 2, dadurch gekennzeichnet, dass aufgenommene genannte demodulierte Signale kontinuierlich von einem Control-Computer (5) gelesen werden.A method according to claim 2, characterized in that said demodulated signals recorded continuously by one Control computer (5) can be read. Verfahren gemäss einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass genannte Datenpakete (7) DAB-Datenpakete sind.Method according to one of claims 1 to 4, characterized in that that said data packets (7) are DAB data packets. Messvorrichtungsanordnung (1) für Einfrequenznetze, in welchen Einfrequenznetzen mehrere Sender (S1, S2, S3) modulierte Signale auf der gleichen Trägerfrequenz aussenden, welche modulierten Signale digitalen Datenpaketen (7) entsprechen, wobei jedes genannte Datenpaket (7) ein gleiches erstes Synchronisationszeichen (72) und ein zweites Synchronisationszeichen (71) mit darin enthaltener Senderidentifizierung umfasst, welche Messvorrichtungsanordnung (1) einen Messempfänger (2) und einen Demodulator (21) umfasst, mittels welchen genannte modulierte Signale empfangen und demoduliert werden, dadurch gekennzeichnet, dass sie ein Kanalimpulsantwort-Bestimmungsmodul (51) umfasst, welches basierend auf den demodulierten Signalen eine Kanalimpulsantwort (53) bestimmt, indem es die zeitliche Abfolge und die Amplitudenstärke von empfangenen genannten ersten Synchronisationszeichen (72) durch Vergleichen mit einem ersten Referenzsynchronisationszeichen bestimmt, und dass sie ein Amplitudenspitzen-ldentifizierungsmodul (52) umfasst, welches Amplitudenspitzen der bestimmten Kanalimpulsantwort (53) einem genannten Sender (S1, S2, S3) zuordnet, indem es für jedes empfangene genannte zweite Synchronisationszeichen (71) aus verschiedenen zweiten Referenzsynchronisationszeichen, welche zweiten Referenzsynchronisationszeichen jeweils eine verschiedene Senderidentifizierung enthalten, das genannte zweite Referenzsynchronisationszeichen mit der grössten Übereinstimmung bestimmt und die darin enthaltene Senderidentifizierung der genannten Amplitudenspitze zuordnet, die dem betreffenden genannten empfangenen zweiten Synchronisationszeichen (71) zugehört. Measuring device arrangement (1) for single-frequency networks, in which single-frequency networks a plurality of transmitters (S1, S2, S3) emit modulated signals on the same carrier frequency, which modulated signals correspond to digital data packets (7), each said data packet (7) having the same first synchronization symbol (72 ) and a second synchronization symbol (71) with transmitter identification contained therein, which measuring device arrangement (1) comprises a measuring receiver (2) and a demodulator (21), by means of which said modulated signals are received and demodulated, characterized in that that it comprises a channel impulse response determination module (51) which, based on the demodulated signals, determines a channel impulse response (53) by determining the time sequence and the amplitude strength of received first synchronization characters (72) by comparison with a first reference synchronization character, and that it comprises an amplitude peak identification module (52) which assigns amplitude peaks of the specific channel impulse response (53) to a transmitter (S1, S2, S3) by for each received second synchronization symbol (71) received from different second reference synchronization symbols, which second reference synchronization symbols each contain a different transmitter identification, determine said second reference synchronization symbol with the greatest match and assign the transmitter identification contained therein to said amplitude peak, which belongs to the relevant said second synchronization symbol (71) received. Messvorrichtungsanordnung (1) gemäss Anspruch 6, dadurch gekennzeichnet, dass der genannte Demodulator (21) ein Quadraturdemodulator ist, und dass sie einen Transientenrecorder (3) umfasst, welcher die demodulierten Signale aufzeichnet.Measuring device arrangement (1) according to claim 6, characterized in that that said demodulator (21) is a quadrature demodulator and that it comprises a transient recorder (3) which demodulates the Records signals. Messvorrichtungsanordnung (1) gemäss Anspruch 7, dadurch gekennzeichnet, dass sie einen Control-Computer (5) umfasst, der aufgenommene demodulierte Signale zu diskreten Zeitpunkten liest.Measuring device arrangement (1) according to claim 7, characterized in that that it includes a control computer (5), the recorded one reads demodulated signals at discrete times. Messvorrichtungsanordnung (1) gemäss Anspruch 7, dadurch gekennzeichnet, dass sie einen Control-Computer (5) umfasst, der aufgenommene demodulierte Signale kontinuierlich liest.Measuring device arrangement (1) according to claim 7, characterized in that that it includes a control computer (5), the recorded one continuously reads demodulated signals. Messvorrichtungsanordnung (1) gemäss einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass genannte Datenpakete (7) DAB-Datenpakete sind.Measuring device arrangement (1) according to one of claims 6 to 9, characterized in that said data packets (7) DAB data packets are. Computer-lesbarer Datenträger, der codierte Daten enthält, die ein Computer-Programm repräsentieren, welches Computer-Programm ermöglicht, einen Control-Computer (5) einer Messvorrichtungsanordnung (1) gemäss einem der Ansprüche 6 bis 10 so zu steuern, dass der genannte Control-Computer (5) Messparameter eines Messempfängers (2) setzt, welcher Messempfänger (2) modulierte Signale empfängt und demoduliert, welche modulierten Signale digitalen Datenpaketen (7) entsprechen und von mehreren Sendern (S1, S2, S3) eines Einfrequenznetzes auf der gleichen Trägerfrequenz ausgesendet werden, wobei jedes genannte Datenpaket (7) ein gleiches erstes Synchronisationszeichen (72) und ein zweites Synchronisationszeichen (71) mit darin enthaltener Senderidentifizierung umfasst, und dass der genannte Control-Computer (5) demodulierte Signale entgegennimmt, dadurch gekennzeichnet, dass das genannte Computer-Programm ein Kanalimpulsantwort-Bestimmungsmodul (51) umfasst, welches den genannten Control-Computer (5) so steuert, dass er basierend auf den demodulierten Signalen eine Kanalimpulsantwort (53) bestimmt, indem er die zeitliche Abfolge und die Amplitudenstärke von empfangenen genannten ersten Synchronisationszeichen (72) durch Vergleichen mit einem ersten Referenzsynchronisationszeichen bestimmt, und dass das genannte Computer-Programm ein Amplitudenspitzen-Identifizierungsmodul (52) umfasst, welches den genannten Control-Computer (5) so steuert, dass er Amplitudenspitzen der bestimmten Kanalimpulsantwort einem genannten Sender (S1, S2, S3) zuordnet, indem er für jedes empfangene genannte zweite Synchronisationszeichen (71) aus verschiedenen zweiten Referenzsynchronisationszeichen, welche zweiten Referenzsynchronisationszeichen jeweils eine verschiedene Senderidentifizierung enthalten, das genannte zweite Referenzsynchronisationszeichen mit der grössten Übereinstimmung bestimmt und die darin enthaltene Senderidentifizierung der genannten Amplitudenspitze zuordnet, die dem betreffenden genannten empfangenen zweiten Synchronisationszeichen (71) zugehört. Computer-readable data carrier containing encoded data representing a computer program, which computer program enables a control computer (5) of a measuring device arrangement (1) to be controlled in accordance with one of claims 6 to 10 such that said control -Computer (5) sets measuring parameters of a measuring receiver (2), which measuring receiver (2) receives and demodulates modulated signals, which modulated signals correspond to digital data packets (7) and from several transmitters (S1, S2, S3) of a single-frequency network on the same carrier frequency are transmitted, each said data packet (7) comprising an identical first synchronization symbol (72) and a second synchronization symbol (71) with the transmitter identification contained therein, and in that the said control computer (5) accepts demodulated signals, characterized in that that said computer program comprises a channel impulse response determination module (51) which controls said control computer (5) in such a way that it determines a channel impulse response (53) based on the demodulated signals by determining the time sequence and the amplitude strength of received said first synchronization character (72) determined by comparison with a first reference synchronization character, and that said computer program comprises an amplitude peak identification module (52) which controls said control computer (5) in such a way that it assigns amplitude peaks of the determined channel impulse response to a transmitter (S1, S2, S3) by receiving for each one said second synchronization symbol (71) from different second reference synchronization symbols, which second reference synchronization symbols each contain a different transmitter identification, determines said second reference synchronization symbol with the greatest match and assigns the transmitter identification contained therein to said amplitude peak, which belongs to the said second synchronization symbol (71) received .
EP99810552A 1999-06-22 1999-06-22 Measuring method for single frequency network and apparatus therefor Expired - Lifetime EP1063799B1 (en)

Priority Applications (3)

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AT99810552T ATE247348T1 (en) 1999-06-22 1999-06-22 MEASURING METHODS FOR SINGLE-FREQUENCY NETWORKS AND APPARATUS THEREOF
DE59906593T DE59906593D1 (en) 1999-06-22 1999-06-22 Measuring methods for single-frequency networks and devices suitable therefor
EP99810552A EP1063799B1 (en) 1999-06-22 1999-06-22 Measuring method for single frequency network and apparatus therefor

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WO2005029736A2 (en) * 2003-09-11 2005-03-31 Rohde & Schwarz Gmbh & Co. Kg Method for monitoring the time synchronisation of emitters in a common wave network
WO2005050882A1 (en) * 2003-11-21 2005-06-02 Rohde & Schwarz Gmbh & Co. Kg Method and device for monitoring carrier frequency stability of transmitters in a common wave network
EP1748587A2 (en) * 2005-07-29 2007-01-31 Anritsu Corporation Analyzing apparatus and analyzing method for digital broadcasting signal
FR2891427A1 (en) * 2005-09-23 2007-03-30 Tdf Sa Data broadcasting method for e.g. single frequency network type digital terrestrial television network, involves verifying that determined time-shift value is equal to reference time-shift value imposed for transmitter
FR2927756A1 (en) * 2008-02-19 2009-08-21 Tdf Soc Par Actions Simplifiee SYNCHRONOUS DATA TRANSMISSION NETWORK AND METHOD OF MONITORING SUCH A NETWORK.
FR2937202A1 (en) * 2008-10-15 2010-04-16 Tdf SYSTEM FOR MONITORING A SYNCHRONOUS TRANSMISSION NETWORK
EP1901454A3 (en) * 2006-09-14 2013-06-26 Kabushiki Kaisha Toshiba Digital broadcasting system, and broadcasting transmitter and monitoring device for use in the system

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US5602832A (en) * 1993-09-22 1997-02-11 Northern Telecom Limited Receiver device for code division multiplex communication system

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005029736A2 (en) * 2003-09-11 2005-03-31 Rohde & Schwarz Gmbh & Co. Kg Method for monitoring the time synchronisation of emitters in a common wave network
WO2005029736A3 (en) * 2003-09-11 2005-07-07 Rohde & Schwarz Method for monitoring the time synchronisation of emitters in a common wave network
AU2004305621B2 (en) * 2003-09-11 2008-07-31 Rohde & Schwarz Gmbh & Co. Kg Method for monitoring the time synchronisation of emitters in a common wave network
WO2005050882A1 (en) * 2003-11-21 2005-06-02 Rohde & Schwarz Gmbh & Co. Kg Method and device for monitoring carrier frequency stability of transmitters in a common wave network
CN100596040C (en) * 2003-11-21 2010-03-24 罗德施瓦兹两合股份有限公司 Method and device for monitoring carrier frequency stability of transmitters in a common wave network
US7668245B2 (en) 2003-11-21 2010-02-23 Rohde & Schwarz Gmbh & Co. Kg Method and device for monitoring carrier frequency stability of transmitters in a common wave network
EP1748587A2 (en) * 2005-07-29 2007-01-31 Anritsu Corporation Analyzing apparatus and analyzing method for digital broadcasting signal
EP1748587A3 (en) * 2005-07-29 2014-07-30 Anritsu Company Analyzing apparatus and analyzing method for digital broadcasting signal
WO2007036485A3 (en) * 2005-09-23 2007-05-31 Tdf Measuring the synchronization of transmitters in a single-frequency network using an external reference
WO2007036485A2 (en) * 2005-09-23 2007-04-05 Tdf Measuring the synchronization of transmitters in a single-frequency network using an external reference
FR2891427A1 (en) * 2005-09-23 2007-03-30 Tdf Sa Data broadcasting method for e.g. single frequency network type digital terrestrial television network, involves verifying that determined time-shift value is equal to reference time-shift value imposed for transmitter
CN104796791A (en) * 2006-09-14 2015-07-22 株式会社东芝 Digital broadcasting system, and broadcasting transmitter and monitoring device for use in the system
EP1901454A3 (en) * 2006-09-14 2013-06-26 Kabushiki Kaisha Toshiba Digital broadcasting system, and broadcasting transmitter and monitoring device for use in the system
US8565136B2 (en) 2006-09-14 2013-10-22 Kabushiki Kaisha Toshiba Digital broadcasting system, and broadcasting transmitter and monitoring device for use in the system
FR2927756A1 (en) * 2008-02-19 2009-08-21 Tdf Soc Par Actions Simplifiee SYNCHRONOUS DATA TRANSMISSION NETWORK AND METHOD OF MONITORING SUCH A NETWORK.
EP2093910A3 (en) * 2008-02-19 2009-12-09 Tdf Network for synchronous transmission of data and surveillance method of such a network.
EP2178229A1 (en) * 2008-10-15 2010-04-21 Tdf Monitoring system of a synchronous transmission network
FR2937202A1 (en) * 2008-10-15 2010-04-16 Tdf SYSTEM FOR MONITORING A SYNCHRONOUS TRANSMISSION NETWORK

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DE59906593D1 (en) 2003-09-18
ATE247348T1 (en) 2003-08-15
EP1063799B1 (en) 2003-08-13

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