EP1063799A1 - Measuring method for single frequency network and apparatus therefor - Google Patents
Measuring method for single frequency network and apparatus therefor Download PDFInfo
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- 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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- Prior art keywords
- synchronization
- received
- signals
- impulse response
- channel impulse
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
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- 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 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
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
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
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
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
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
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
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
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
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
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
- 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
- QuadratursignalQuadrature signal
- S1, S2, S3S1, S2, S3
- Sender (Transmitter)Transmitter
Claims (11)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99810552A EP1063799B1 (en) | 1999-06-22 | 1999-06-22 | Measuring method for single frequency network and apparatus therefor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1063799A1 true EP1063799A1 (en) | 2000-12-27 |
EP1063799B1 EP1063799B1 (en) | 2003-08-13 |
Family
ID=8242894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99810552A Expired - Lifetime EP1063799B1 (en) | 1999-06-22 | 1999-06-22 | Measuring method for single frequency network and apparatus therefor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1063799B1 (en) |
AT (1) | ATE247348T1 (en) |
DE (1) | DE59906593D1 (en) |
Cited By (7)
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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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Cited By (18)
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 |
Also Published As
Publication number | Publication date |
---|---|
DE59906593D1 (en) | 2003-09-18 |
ATE247348T1 (en) | 2003-08-15 |
EP1063799B1 (en) | 2003-08-13 |
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