EP0569374A1 - Procedure for the identification of transmitter or region in common-wave broadcasting networks. - Google Patents

Procedure for the identification of transmitter or region in common-wave broadcasting networks.

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Publication number
EP0569374A1
EP0569374A1 EP92901301A EP92901301A EP0569374A1 EP 0569374 A1 EP0569374 A1 EP 0569374A1 EP 92901301 A EP92901301 A EP 92901301A EP 92901301 A EP92901301 A EP 92901301A EP 0569374 A1 EP0569374 A1 EP 0569374A1
Authority
EP
European Patent Office
Prior art keywords
transmitter
identification
transmission
carrier frequencies
individual
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92901301A
Other languages
German (de)
French (fr)
Other versions
EP0569374B1 (en
Inventor
Werner Saalfrank
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundig Multimedia BV
Delphi Technologies Inc
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Publication of EP0569374A1 publication Critical patent/EP0569374A1/en
Application granted granted Critical
Publication of EP0569374B1 publication Critical patent/EP0569374B1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/49—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations
    • H04H60/50—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of broadcast or relay stations
    • 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

  • a ' high-quality radio transmission which corresponds to the quality standard offered by digital storage media (compact disk, DAT), is not possible with today's analogue VHF transmission method, especially with mobile reception in a motor vehicle or with portable devices. Fluctuations in field strength and multi-path reception lead to signal distortions, the effects of which can only be partially mitigated by tricky switching strategies on alternative reception frequencies (eg in connection with the radio data system, RDS).
  • a digital radio transmission for mobile reception with the help of satellites is currently failing. the need to use receiving antennas with pronounced directivity due to the comparatively low transmission power.
  • DAB Digital Audio Broadcasting
  • Funkschau - Spezial Digital Sound - From radio to mobile phone
  • One of the specifics of the planned transmission network is the simultaneous operation of the transmitting stations involved in a nationwide program. This means that, in a certain area, all of the transmission stations simultaneously transmit transmission signals with the same modulation content on the same transmission frequency or the same carrier frequencies.
  • COFDM method Coded Orthogonal F equency Division Multiplex
  • COFDM method Coded Orthogonal F equency Division Multiplex
  • an area e.g. the transmission area of a state broadcaster
  • a carrier frequency bandwidth e.g. 1.5 MHz at the same time about 5 ... 6 stereo programs (in addition to additional program-related and program-independent data) can be sent.
  • a large number of individual carriers e.g. 448 carrier frequencies at an equidistant distance on the frequency axis
  • DPSK Differential Phase Shift Keying
  • a frequency band with a total bandwidth of 4 x B is therefore required for the implementation of the same wave of DAB radio broadcasting.
  • a network of locally limited transmitters can of course also be set up with the help of the remaining 3 cluster frequencies, so that in addition to the 5 ... 6 national programs, a further 6 to 18 local programs can be broadcast.
  • the single-wave operation of a nationwide transmitter network requires 100% agreement of the modulation contents of the frequency components occupied simultaneously by the individual transmitter stations in order to enable interference-free decoding of the program data.
  • the nationwide broadcast of the same traffic message contradicts the need to provide regional or local traffic information to the driver.
  • the motorist who is from a broadcasting area in a exchanged neighboring rough location information are given so that its receiving device can be automatically or manually tuned to the receiving channel of the neighboring region.
  • the method should also be able to transmit other non-regional station data.
  • 1a shows the arrangement of the carrier frequencies for a country-specific single-frequency network
  • FIG. 1b shows the carrier frequency arrangement according to FIG. 1a, but with an additional transmitter or regional identifier.
  • Fig. 2 is a frequency distribution scheme in the form of a cluster of 4 According to Fig. 1a
  • DAB transmission methods within a country-wide transmission area e.g. 448, carrier frequencies with an equidistant frequency spacing ⁇ f are simultaneously radiated in a frequency range with the bandwidth B.
  • the individual carriers are each modulated with part of the digital data, the modulation contents of the individual carriers being identical for all the transmitting stations in the transmission area.
  • time-division multiplexing is used, the data of various programs within the data packets are transmitted in chronological order, so that for a program change within the program offer of a particular broadcaster in the receiver there is no need to change the tuning frequencies, but only to switch the time-related decoding of the data packets.
  • the data content of a program is not only limited to audio signals, but can also consist partially or exclusively of information or control data (eg image transmission or traffic control data).
  • Frequency planning can be created in which areas with the same carrier frequency range do not adjoin each other (see 4-color representation of political maps).
  • local broadcasters with a different program offer can also be embedded within a broadcasting area if the other three cluster frequencies are assigned to them and it is ensured that their broadcasting does not penetrate into adjacent broadcasting areas with the same carrier frequency range at any point.
  • Modulation content must be applied, ie a regional or station-specific identifier within the program information is not possible.
  • a regional or station-specific identifier within the program information is not possible.
  • the field strength and / or the number or temporal sequence of the received echoes of the received signal provided with a special identifier can be evaluated in order to identify which special transmitting station the receiver is closest within the nationwide single-frequency network. According to FIG.
  • the identification can take place via n non-modulated carrier frequencies (dashed frequency lines n-3 .... n), which are emitted in addition to the carrier frequencies 1 ... m used for program transmission according to FIG. 1a.
  • n non-modulated carrier frequencies dashed frequency lines n-3 .... n
  • additional n carriers can be introduced at any point within or outside the frequency band required for program transmission, but only in the predetermined frequency grid. In any case, the bandwidth to be transmitted increases from B to B '.
  • the arrangement of the additional carrier frequencies in the frequency range to be transmitted allows multiple variations of the identifier.
  • the additional carrier frequencies required for transmitter identification lead to a considerable expansion of the frequency bandwidth B 'to be transmitted in the case of a large number of transmitter stations within a transmitter area.
  • This disadvantage can be avoided if one or more of these additional carriers are modulated with a special identification signal.
  • at least four groups of additional carriers can be provided in analogy to FIG. 2, the local use of which is planned so that there is no mutual interference.
  • the identification signals are modulated onto the additional carriers in the same way using the COFDM method.
  • any number of subordinate single-wave networks can also be formed with respect to the additional carriers within large-area single-frequency networks.
  • the additional carriers can, for. B. can also be modulated with switching or synchronous signals. Since there is sufficient time for the evaluation of the additional signals or for redundancy within the transmission capacity of an individual additional carrier, the additional frequency requirement can in most cases be limited to one additional carrier instead of an entire group.
  • the station or regional identifier With the help of the station or regional identifier, it is also possible to recognize the change to a neighboring broadcasting area with a different program offer early on in mobile reception in cross-border traffic.
  • the orientation is carried out by comparing the received identifier with the identifier list stored in an internal memory and relating to the transmitter landscape.
  • the receiver can be tuned manually or automatically to the carrier frequency group of the new transmission area as soon as the reception quality of the transmission signal received up to that point is no longer sufficient.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de transmission sans fil utilisant les ondes communes. Pour l'exploitation des réseaux à onde commune, il est nécessaire que la modulation des fréquences d'émission (B1, B2, B3, B4) soit identiques pour toutes les stations émettrices. Pour permettre cependant une identification des émetteurs ou une identification régionale on envoie une ou plusieurs fréquences porteuses (B2, B3, B4) supplémentaires différentes, dont la réception permet, dans le récepteur, la sélection d'informations particulières liées à la région. Le nombre de fréquences porteuses supplémentaires nécessaires peut être réduit à quatre fréquences individuelles ou groupes de fréquences lorsque ces fréquences porteuses supplémentaires sont modulées avec des signaux d'identification.The invention relates to a wireless transmission method using common waves. For the operation of common wave networks, the modulation of the transmission frequencies (B1, B2, B3, B4) must be identical for all the transmitting stations. However, to allow an identification of the transmitters or a regional identification, one or more additional carrier frequencies (B2, B3, B4) are sent, the reception of which allows, in the receiver, the selection of specific information linked to the region. The number of additional carrier frequencies required can be reduced to four individual frequencies or groups of frequencies when these additional carrier frequencies are modulated with identification signals.

Description

VERFAHREN ZUR SENDER- BZW. REGIONALKENNUNG IN GLEICHWELLENNETZEN PROCESS FOR TRANSMITTER OR REGIONAL IDENTIFIER IN SAME-WAVE NETWORKS
BESCHREIBUNGDESCRIPTION
Eine' qualitativ hochwertige Hörfunkübertragung, die dem von digitalen Speichermedien (Compact-Disk, DAT) gebotenen Qualitätsstandard entspricht, ist mit dem heutigen analogen UKW-übertragungsverfahren, besonders beim mobilen Empfang im Kraftfahrzeug oder mit tragbaren Geräten nicht möglich. Feldstärkeschwankungen und Mehrwegeempfang führen zu Signalverzerrungen, deren Auswirkungen nur zum Teil durch trickreiche Wechselstrategien auf alternative Empfangsfrequenzen (z.B. in Verbindung mit den Radio-Daten-System, RDS) gemildert werden können.A ' high-quality radio transmission, which corresponds to the quality standard offered by digital storage media (compact disk, DAT), is not possible with today's analogue VHF transmission method, especially with mobile reception in a motor vehicle or with portable devices. Fluctuations in field strength and multi-path reception lead to signal distortions, the effects of which can only be partially mitigated by tricky switching strategies on alternative reception frequencies (eg in connection with the radio data system, RDS).
Eine digitale Hörfunkübertragung für den mobilen Empfang mit Hilfe von Satelliten scheitert z.Zt. noch an der Notwendigkeit, wegen der vergleichsweise geringen Sendeleistung Empfangsantennen mit ausgeprägter Richtwirkung zu verwenden.A digital radio transmission for mobile reception with the help of satellites is currently failing. the need to use receiving antennas with pronounced directivity due to the comparatively low transmission power.
Es wird deshalb seit einigen Jahren an einem Standard für ein neues terrestrisches, digitales Übertragungsverfahren gearbeitet, das unter der Bezeichnung "DAB" (Digital Audio Broadcasting) bekannt ist (s. dazu "Funkschau - Spezial": "Digitaler Ton - Von Hörfunk bis Mobiltelefon", 1989, Seiten 9-18) . Eines der Spezifica des geplanten Übertragungsnetzes ist der Gleichwellenbetrieb der im Rahmen einer landesweiten Programmdarbietung beteiligten Sendestationen. Das bedeutet, daß in einem bestimmten Gebiet sämtliche Sendestationen gleichzeitig Sendesignale mit demselben Modulationsinhalt auf derselben Sendefrequenz bzw. denselben Trägerfrequenzen ausstrahlen.For this reason, a standard for a new terrestrial, digital transmission method has been worked on for a number of years, which is known under the name "DAB" (Digital Audio Broadcasting) (see also "Funkschau - Spezial": "Digital Sound - From radio to mobile phone ", 1989, pages 9-18). One of the specifics of the planned transmission network is the simultaneous operation of the transmitting stations involved in a nationwide program. This means that, in a certain area, all of the transmission stations simultaneously transmit transmission signals with the same modulation content on the same transmission frequency or the same carrier frequencies.
Als Übertragungsmethode ist das sog. COFDM-Verfahren (Coded Orthogonal F equency Division Multiplex) vorgesehen, mit dem innerhalb eines Gebietes, z.B. des Sendegebietes einer Landesrundfunkanstalt, bei Ausnutzung einer Trägerfrequenz-Bandbreite von z.B. 1,5 MHz gleichzeitig ca.5...6 Stereoprogramme (neben zusätzlich programmbezogenen und programmunabhängigen Daten) gesendet werden können. Innerhalb der zur Verfügung stehenden Kanal-Bandbreite werden dabei eine Vielzahl von Einzelträgern (z.B. 448 Trägerfrequenzen in äquidistantem- Abstand auf der Frequenzachse) mit einerThe so-called COFDM method (Coded Orthogonal F equency Division Multiplex) is provided as the transmission method, with which within an area, e.g. the transmission area of a state broadcaster, when using a carrier frequency bandwidth of e.g. 1.5 MHz at the same time about 5 ... 6 stereo programs (in addition to additional program-related and program-independent data) can be sent. Within the available channel bandwidth, a large number of individual carriers (e.g. 448 carrier frequencies at an equidistant distance on the frequency axis) are combined with one
4-DPSK-Modulation beaufschlagt (DPSK = Differential Phase Shift Keying) . Durch Verwürfein der digitalen Programmdaten in der Zeitfolge und in der Zuordnung zu den einzelnen Trägerfrequenzen wird erreicht, daß sich Übertragungsfehler aufgrund von Feldstärkeschwankungen nicht über längere, zeitlich zusammenhängende Signal¬ abschnitte erstrecken und deshalb leichter korrigiert werden können.4-DPSK modulation applied (DPSK = Differential Phase Shift Keying). By scrambling the digital program data in the time sequence and in the assignment to the individual carrier frequencies, it is achieved that transmission errors due to field strength fluctuations do not extend over longer, temporally connected signal sections and can therefore be corrected more easily.
Eine ausführliche Erläuterung des prinzipiellen Übertragungs- und Codierverfahrens ist dem Beitrag "Digital Sound Broadcasting to Mobil Receivers" in der Publikation "IEE Transactions in Consumer Electronics", Vol. 35, No.3, Aug. 89, Seiten 439-503 zu entnehmen. Für den Aufbau eines länderübergreifenden Sendernetzes ist es notwendig, minimal 4 verschiedene Sendekanäle einer bestimmten Bandbreite B zur Verfügung zu stellen, damit sich die unterschiedlichen Programme der einzelnen Sendegebiete nicht gegenseitig stören. Mit Hilfe dieser vier verschiedenen Sendekanäle ist es möglich, die Frequenzverteilung auf die einzelnen Sendegebiete in Form eines 4-er Clusters so zu planen, daß ein gebietsübergreifendes bzw. internationales Sendernetz keine aneinander angrenzenden Zonen mit unterschiedlichem Programm, aber gleicher Sendefrequenz hat. Für die Gleichwellen-Realisierung des DAB- Hörrundfunks wird deshalb ein Frequenzband mit einer Bandbreite von insgesamt 4 x B benötigt. Innerhalb eines Sendegebietes kann natürlich mit Hilfe der übrigen 3 Cluster-Frequenzen auch ein Netz lokal begrenzter Sender aufgebaut werden, so daß neben den 5...6 landesweiten Programmen weitere 6 bis 18 Lokalprogramme ausgestrahlt werden können.A detailed explanation of the basic transmission and coding method can be found in the article "Digital Sound Broadcasting to Mobile Receivers" in the publication "IEE Transactions in Consumer Electronics", Vol. 35, No.3, Aug. 89, pages 439-503. To set up a transnational transmitter network, it is necessary to provide a minimum of 4 different transmission channels of a certain bandwidth B, so that the different programs of the individual transmission areas do not interfere with each other. With the help of these four different transmission channels, it is possible to plan the frequency distribution to the individual transmission areas in the form of a cluster of 4 so that a cross-area or international transmitter network does not have any adjacent zones with different programs, but the same transmission frequency. A frequency band with a total bandwidth of 4 x B is therefore required for the implementation of the same wave of DAB radio broadcasting. Within a broadcasting area, a network of locally limited transmitters can of course also be set up with the help of the remaining 3 cluster frequencies, so that in addition to the 5 ... 6 national programs, a further 6 to 18 local programs can be broadcast.
Wie eingangs erwähnt, verlangt der Gleichwellenbetrieb eines z.B. landesweiten Sendernetzes die 100-prozentige Übereinstimmung der Modulationsinhalte der von den einzelnen Sendestationen gleichzeitig belegten Frequenzanteilen, um eine störungsfreie Decodierung der Programmdaten zu ermöglichen. Da das künftige DAB-Netz aber auch die Aufgaben des heutigen UKW-Verkehrsfunks übernehmen soll, widerspricht die z.B.landesweite Ausstrahlung derselben Verkehrsnachricht der Notwendigkeit, dem Autofahrer gezielt regionale oder lokale Verkehrshinweise zu übermitteln. Außerdem sollte dem Autofahrer, der von einem Sendegebiet in ein benachbartes überwechselt, eine grobe Standortinformation gegeben werden, damit sein Empfangsgerät automatisch oder manuell auf den Empfangskanal der Nachbarregion abgestimmt werden kann.As mentioned at the beginning, the single-wave operation of a nationwide transmitter network, for example, requires 100% agreement of the modulation contents of the frequency components occupied simultaneously by the individual transmitter stations in order to enable interference-free decoding of the program data. However, since the future DAB network is also to take over the tasks of today's VHF traffic radio, the nationwide broadcast of the same traffic message, for example, contradicts the need to provide regional or local traffic information to the driver. In addition, the motorist who is from a broadcasting area in a exchanged neighboring, rough location information are given so that its receiving device can be automatically or manually tuned to the receiving channel of the neighboring region.
Es ist deshalb Aufgabe der Erfindung, ein Verfahren zur Sender- bzw. Regionalkennung vorzuschlagen, das den Gleichwellenbetrieb des Sendernetzes nicht stört. Das Verfahren soll außerdem in der Lage sein, weitere nicht regional bezogene Senderdaten zu übermitteln.It is therefore an object of the invention to propose a method for transmitter or regional identification that does not interfere with the single-wave operation of the transmitter network. The method should also be able to transmit other non-regional station data.
Diese Aufgabe wird bei dem im Oberbegriff des Anspruchs 1 definierten Gleichwellen-Übertragungsverfahren durch die im kennzeichnenden Teil des Anspruchs 1 genannten Merkmale gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen 2 - 6 offenbart.This object is achieved in the same-wave transmission method defined in the preamble of claim 1 by the features mentioned in the characterizing part of claim 1. Further advantageous embodiments of the invention are disclosed in subclaims 2-6.
Die Erfindung wird anhand der Zeichnungen nachfolgend näher erläutert.The invention is explained in more detail below with reference to the drawings.
Es zeigen:Show it:
Fig. 1a die Anordnung der Trägerfrequenzen für ein länderbezogenes Gleichwellennetz1a shows the arrangement of the carrier frequencies for a country-specific single-frequency network
Fig. 1b die Trägerfrequenzanordnung nach Fig. 1a, jedoch mit zusätzlicher Sender- bzw. Regionalkennung.1b shows the carrier frequency arrangement according to FIG. 1a, but with an additional transmitter or regional identifier.
Fig. 2 ein Frequenzverteilungsschema in Form eines 4-er Clusters Entsprechend Fig. 1a werden beimFig. 2 is a frequency distribution scheme in the form of a cluster of 4 According to Fig. 1a
DAB-Übertragungsverfahren innerhalb eines landesweiten Sendegebietes (z.B. 448) Trägerfrequenzen mit aquidistantem Frequenzabstand Δf in einem Frequenzbereich mit der Bandbreite B gleichzeitig abgestrahlt. Die einzelnen Träger sind mit jeweils einem Teil der digitalen Daten moduliert, wobei die Modulationsinhalte der «einzelnen Träger für sämtliche Sendestationen des Sendegebietes identisch sind. Wird im Zeitmultiplexbetrieb gearbeitet, so werden die Daten verschiedener Programme innerhalb der Datenpakete in zeitlicher Reihenfolge übertragen, so daß für einen Programmwechsel innerhalb des Programmangebotes einer bestimmten Sendeanstalt im Empfänger kein Wechsel der Abstimmfrequenzen, sondern nur ein Umschalten der zeitlich zugeordneten Decodierung der Datenpakete erfolgen muß.Der Dateninhalt eines Programms beschränkt sich nicht nur auf Audiosignale, sondern kann auch teilweise oder ausschließlich aus Informations- oder Steuerungsdaten (z.B. Bildübertragungs- oder Verkehrsleitdaten) bestehen.DAB transmission methods within a country-wide transmission area (e.g. 448) carrier frequencies with an equidistant frequency spacing Δf are simultaneously radiated in a frequency range with the bandwidth B. The individual carriers are each modulated with part of the digital data, the modulation contents of the individual carriers being identical for all the transmitting stations in the transmission area. If time-division multiplexing is used, the data of various programs within the data packets are transmitted in chronological order, so that for a program change within the program offer of a particular broadcaster in the receiver there is no need to change the tuning frequencies, but only to switch the time-related decoding of the data packets. The data content of a program is not only limited to audio signals, but can also consist partially or exclusively of information or control data (eg image transmission or traffic control data).
Außerhalb des Sendegebietes einer Landesrundfunkanstalt mit dem Trägerfrequenzbereich B,. können von einem Sender mit unterschiedlichem Programmangebot natürlich nicht dieselben Trägerfrequenzen verwendet werden, weil im Überlappungsbereich beider Sendegebiete dann keine eindeutige Programm-Decodierung mehr möglich ist. Diesem benachbarten Sendegebiet muß deshalb ein getrennter Trägerfrequenzbereich B2 zugeordnet werden. Aus Fig. 2 ist ersichtlich, daß unter Zugrundlegung von mindestens vier getrennten Frequenzbereichen B......B- eineOutside the transmission area of a state broadcaster with the carrier frequency range B ,. Of course, the same carrier frequencies cannot be used by a transmitter with a different range of programs, because then no clear program decoding is then possible in the overlap area of the two transmission regions. A separate carrier frequency range B 2 must therefore be assigned to this neighboring transmission area. From Fig. 2 it can be seen that on the basis of at least four separate frequency ranges B ...... B- one
Frequenzplanung erstellt werden kann, bei der Gebiete mit gleichem Trägerfrequenzbereich nicht aneinander angrenzen (vgl. 4-Farben-Darstellung von politischen Landkarten).Frequency planning can be created in which areas with the same carrier frequency range do not adjoin each other (see 4-color representation of political maps).
Innerhalb eines Sendegebietes können aber auch lokal begrenzte Sender mit anderem Programmangebot eingebettet werden, wenn ihnen die übrigen drei Cluster-Frequenzen zugeordnet werden und sichergestellt ist, daß ihre Ausstrahlung an keiner Stelle in benachbarte Sendegebiete mit gleichem Trägerfrequenzbereich eindringt.However, local broadcasters with a different program offer can also be embedded within a broadcasting area if the other three cluster frequencies are assigned to them and it is ensured that their broadcasting does not penetrate into adjacent broadcasting areas with the same carrier frequency range at any point.
Um einen störungsfreien Gleichwellenbetrieb innerhalb eines Sendegebietes zu gewährleisten, müssen sämtliche, zur Programm-oder Datenübertragung verwendeten Trägerfrequenzen mit jeweils identischemIn order to ensure interference-free single-wave operation within a transmission area, all carrier frequencies used for program or data transmission must be identical in each case
Modulationsinhalt beaufschlagt sein, d.h., eine regionale oder senderspezifische Kennung innerhalb der Programminformation ist nicht möglich. Um aber z.B. bei Verkehrsnachrichten eine gezielte Auswahl aus den landesweit abgefaßten Verkehrshinweisen treffen oder aber regionale Standard-Alarmmeldungen detektieren zu können, ist es notwendig, über eine spezielle Senderkennung eine grobe örtliche Orientierung dem Empfänger zu ermöglichen. Dabei können auch sämtliche Sender einer bestimmten Region mit derselben Kennung versehen sein, wenn die Meldung nicht nur lokal von Bedeutung ist. Zur Erkennung, welcher speziellen Sendestation innerhalb des landesweiten Gleichwellennetzes der Empfänger am nächsten ist, kann die Feldstärke und/oder die Anzahl oder zeitliche Folge der empfangenen Echos des mit besonderer Kennung versehenen Empfangssignales ausgewertet werden. Entsprechend Fig. 1b kann die Kennung über n nichtmodulierte Trägerfrequenzen erfolgen (gestrichelte Frequenzlinien n-3....n), die zusätzlich zu den nach Fig. 1a für die Programmübertragung verwendeten Trägerfrequenzen 1...m ausgesendet werden. Diese zusätzlichen n Träger können innerhalb oder außerhalb des zur Programmübertragung benötigten Frequenzbandes an beliebiger Stelle, jedoch nur im vorgegebenen Frequenzraster eingebracht werden. In jedem Fall vergrößert sich die zu übertragende Bandbreite von B auf B' . Die Anordnung der Zusatz-Trägerfrequenzen im zu übertragenden Frequenzbereich erlaubt vielfache Variationen der Kennung.Modulation content must be applied, ie a regional or station-specific identifier within the program information is not possible. However, in order to be able to make a targeted selection from the nationwide traffic information, for example, or to be able to detect regional standard alarm messages, it is necessary to provide the recipient with a rough local orientation using a special transmitter identifier. All transmitters in a specific region can also be provided with the same identifier if the message is not only of local importance. The field strength and / or the number or temporal sequence of the received echoes of the received signal provided with a special identifier can be evaluated in order to identify which special transmitting station the receiver is closest within the nationwide single-frequency network. According to FIG. 1b, the identification can take place via n non-modulated carrier frequencies (dashed frequency lines n-3 .... n), which are emitted in addition to the carrier frequencies 1 ... m used for program transmission according to FIG. 1a. These additional n carriers can be introduced at any point within or outside the frequency band required for program transmission, but only in the predetermined frequency grid. In any case, the bandwidth to be transmitted increases from B to B '. The arrangement of the additional carrier frequencies in the frequency range to be transmitted allows multiple variations of the identifier.
Die zur Senderkennung benötigten zusätzlichen Trägerfrequenzen führen bei einer großen Anzahl von Sendestationen innerhalb eines Sendegebietes zu einer erheblichen Ausweitung der zu übertragenden Frequenzbandbreite B' . Dieser Nachteil kann vermieden werden, wenn ein oder mehrere dieser Zusatzträger mit einem speziellen Kennungssignal moduliert werden. Um auch hierbei den Gleichwellenbetrieb nicht zu stören, können in Analogie zu Fig. 2 mindestens vier Gruppen von Zusatzträgern vorgesehen werden, deren örtlicher Einsatz so geplant wird, daß keine gegenseitige Beeinflussung entsteht. Die Kennungssignale werden den Zusatzträgern in gleicher Weise nach dem COFDM-Verfahren aufmoduliert.The additional carrier frequencies required for transmitter identification lead to a considerable expansion of the frequency bandwidth B 'to be transmitted in the case of a large number of transmitter stations within a transmitter area. This disadvantage can be avoided if one or more of these additional carriers are modulated with a special identification signal. In order not to disturb the synchronous wave operation, at least four groups of additional carriers can be provided in analogy to FIG. 2, the local use of which is planned so that there is no mutual interference. The identification signals are modulated onto the additional carriers in the same way using the COFDM method.
Durch die Modulation der Zusatzträger mit Kennungssignalen können innerhalb großflächiger Gleichwellennetze auch beliebig viele, untergeordnete Gleichwellennetze bezogen auf die Zusatzträger gebildet werden. Zur Übertragung regional unabhängiger Daten können die Zusatzträger aber z. B. auch mit Schalt- oder Synchronsignalen moduliert werden. Da für die Auswertung der Zusatzsignale ausreichend Zeit bzw. zur Fehlersicherung innerhalb der Übertragungskapazität eines einzelnen Zusatzträgers genügend Redundanz zur Verfügung steht, kann der zusätzliche Frequenzbedarf in den meisten Fällen auf je einen zusätzlichen Träger statt auf eine ganze Gruppe beschränkt werden.By modulating the additional carriers with identification signals, any number of subordinate single-wave networks can also be formed with respect to the additional carriers within large-area single-frequency networks. For the transmission of regionally independent data, the additional carriers can, for. B. can also be modulated with switching or synchronous signals. Since there is sufficient time for the evaluation of the additional signals or for redundancy within the transmission capacity of an individual additional carrier, the additional frequency requirement can in most cases be limited to one additional carrier instead of an entire group.
Mit Hilfe der Sender- oder Regionalkennung ist es außerdem möglich, beim mobilen Empfang im grenzüberschreitenden Verkehr den Wechsel in ein benachbartes Sendegebiet mit abweichendem Programmangebot frühzeitig zu erkennen. Die Orientierung erfolgt durch einen Vergleich der empfangenen Kennung mit der in einem geräteinternen Speicher abgelegten, auf die Senderlandschaft bezogenen Kennungsliste. Dadurch kann der Empfänger von Hand oder automatisch auf die Trägerfrequenzgruppe des neuen Sendegebietes abgestimmt werden, sobald die Empfangsqualität des bis dahin empfangenen Sendesignals nicht mehr ausreicht. With the help of the station or regional identifier, it is also possible to recognize the change to a neighboring broadcasting area with a different program offer early on in mobile reception in cross-border traffic. The orientation is carried out by comparing the received identifier with the identifier list stored in an internal memory and relating to the transmitter landscape. As a result, the receiver can be tuned manually or automatically to the carrier frequency group of the new transmission area as soon as the reception quality of the transmission signal received up to that point is no longer sufficient.

Claims

6-VERFAHREN ZUR SENDER- BZW. REGIONALKENNUNG IN GLEICHWELLENNETZENPATENTANSPRÜCHE 6 PROCEDURE FOR TRANSMITTER OR REGIONAL IDENTIFIER IN SAME-WAVE PATENT CLAIMS
Verfahren zum drahtlosen Übertragen digitaler Informations-und/oder Steuersignale im Gleichwellenbetrieb, mit einer Vielzahl von Einzelträgern, die jeweils mit einem Teil des Nutzsignales moduliert sind, d a d u r c g e k e n n z e i c h n e t, daß zur Kennzeichnung der jeweiligen Sendestation oder zur Markierung einer bestimmten Senderegion ein oder mehrere zusätzliche, sich regional voneinander unterscheidende Einzelträgerfrequenzen ausgestrahlt werden, deren Vorhandensein zur Senderidentifikation ausgewertet werden und welche dieMethod for the wireless transmission of digital information and / or control signals in single-wave operation, with a large number of individual carriers, each of which is modulated with a portion of the useful signal, characterized in that one or more additional identifiers are used to identify the respective transmitter station or to mark a specific transmitter region regionally different individual carrier frequencies are broadcast, their presence is evaluated for transmitter identification and which the
Informationsübertragung im Gleichwellenbetrieb nicht stören.Do not interfere with information transmission in synchronous operation.
Verfahren nach Anspruch 1 , d a d u r c g e k e n n z e i c n e t, daß die den einzelnen Sendestationen oder -regionen zugeordneten zusätzlichen Trägerfrequenzen im Gleichwellen-Sendernetz auf mindestens vier Gruppen aufgeteilt werden (4-er Cluster), so daß die gleichen Frequenzen in voneinander genügend weit entfernten Senderegionen gleichzeitig verwendet werden können, und daß diese Zusatz-Trägerfrequenzen mit speziellen Kennungssignalen zur Sender-oder Gebietsidentifikation moduliert werden.A method according to claim 1, characterized in that the additional carrier frequencies assigned to the individual transmission stations or regions are divided into at least four groups (4-way cluster) in the single-wave transmitter network, so that the same frequencies can be used simultaneously in sufficiently distant transmission regions , and that these additional carrier frequencies are modulated with special identification signals for transmitter or area identification.
3. Verfahren nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, daß bei Gleichwellennetzen, die nach dem COFDM-Verfahren moduliert sind, die Kennungssignale den Zusatzträgern nach dem gleichen Verfahren aufmoduliert werden.3. The method of claim 2, d a d u r c h g e k e n n z e i c h n e t that in common-frequency networks that are modulated according to the COFDM method, the identification signals are modulated onto the additional carriers according to the same method.
4. Verfahren nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, daß zur Sender-oder Gebietsidentifikation nur ein einziger, mit einem Kennungssignal modulierter, zusätzlicher Träger pro Gruppe verwendet wird.4. The method according to claim 2, which also means that only a single additional carrier, modulated with an identification signal, is used per group for transmitter or area identification.
Verfahren nach einem der Ansprüche 2 bis 4, d a d u r c h g e k e n n z e i c h n e t, daß die den einzelnen Sendestationen oder -regionen zugeordneten zusätzlichen Trägerfrequenzen nicht nur mit Kennungssignalen, sondern auch mit weiteren, nicht unbedingt regional bezogenen Daten moduliert sind.Method according to one of claims 2 to 4, so that the additional carrier frequencies assigned to the individual transmitting stations or regions are not only modulated with identification signals, but also with other, not necessarily regionally related data.
Verfahren nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, daß innerhalb eines in Form von Clustern aufgeteilten Gleichwellen-Sendernetzes durch einen oder mehrere Kennungsträger pro Cluster Unter-Gleichwellennetze gebildet werden. GEÄNDERTE ANSPRÜCHEMethod according to one of claims 1 to 4, characterized in that sub-single-frequency networks are formed within a single-wave transmitter network divided in the form of clusters by one or more identification carriers per cluster. CHANGED REQUIREMENTS
[beim Internationalen Büro am 15. Mai 1992 (15.05.92) eingegangen; ursprünglicher Anspruch 1 geändert; alle weiteren Ansprüche unverändert (2 Seiten)][Received at the International Bureau on May 15, 1992 (May 15, 1992); original claim 1 amended; all other claims unchanged (2 pages)]
Verfahren zum drahtlosen übertragen digitaler Informations- und Steuersignale über ein im Gleichwellenbetrieb arbeitendes Sendernetz, das gleichzeitig über alle zum Sendernetz gehörenden Sendestationen eine Vielzahl unterschiedlicher Einzelträgerfrequenzen ausstrahlt, die innerhalb eines bestimmten Übertragungsfrequenzbandes äquidistant in der Frequenzachse angeordnet sind und die jeweils nur mit Teilen der die Informations- und Steuersignale darstellenden Bitfolge moduliert sind, wobei die Modulationsinhalte der einzelnen Trägerfrequenzen für sämtliche Sendestationen eines Sendegebietes identisch sind, d a d u r c h g e k e n n z e i c h n e t , daß zur Kennzeichnung mindestens einer in einer lokalen Method for wireless transmission of digital information and control signals via a transmitter network operating in the same-wave mode, which simultaneously transmits a large number of different individual carrier frequencies via all transmitter stations belonging to the transmitter network, which are arranged equidistantly in the frequency axis within a specific transmission frequency band and each with only part of the information - and control signals representing bit sequence are modulated, the modulation contents of the individual carrier frequencies being identical for all transmitting stations of a transmitting area, characterized in that at least one in a local for identification
Senderegion befindlichen Sendestation von dieser und gegebenenfalls weiteren Sendestationen eine oder mehrere zusätzliche, sich senderspezifisch oder regional voneinander unterscheidende, unmodulierte Einzelträgerfrequenzen simultan ausgestrahlt werden, deren Vorhandensein oder Anordnung im Frequenzraster . zur Senderidentifikation ausgewertet werden und welche durch ihre von der Informations- und Steuersignalmodulation getrennte Erfassung die Übertragung dieser Nutzsignale im Gleichwellenbetrieb innerhalb sich überlappender Aktionsbereiche einzelner Sendestationen nicht stören.Transmitting station located from this and possibly other transmitting stations one or more additional, different transmitter-specific or regionally different, unmodulated individual carrier frequencies are broadcast simultaneously, their presence or arrangement in the frequency grid. are evaluated for transmitter identification and which, because of their detection, which is separate from the information and control signal modulation, do not interfere with the transmission of these useful signals in synchronous operation within overlapping action areas of individual transmitter stations.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die den einzelnen Sendestationen oder -regionen zugeordneten zusätzlichen Trägerfrequenzen im Gleichwellen-Sendernetz auf mindestens vier Gruppen aufgeteilt werden (4-er Cluster), so daß die gleichen Frequenzen in voneinander genügend weit entfernten Senderegionen gleichzeitig verwendet werden können, 2. The method according to claim 1, characterized in that the additional carrier frequencies assigned to the individual transmission stations or regions are divided into at least four groups in the common-wave transmitter network (4-way cluster), so that the same frequencies are used simultaneously in sufficiently distant transmission regions can be
INARTIKEL19GENANNTEERKLÄRUNGINARTICLE 19 CERTIFICATE
Im vorliegenden internationalen Recherchenbericht ist die als Entgegenhaltung 1 genannte Patentschrift DE 4000 538 C1 als neuheitsschädlich gegenüber An¬ spruch 1 der oben genannten Patentanmeldung eingestuft. Um die Unterschiede der beanspruchten Erfindung gegen¬ über den Merkmalen der Entgegenhaltung klarzustellen und um eine klare Abgrenzung gegenüber dem bekannten Stand der Technik zu erzielen, wurde der Hauptanspruch sowohl in seinem Oberbegriff als auch im kennzeichnen¬ den Teil präzisiert.In the present international search report, patent specification DE 4000 538 C1, cited as document 1, is classified as novelty-damaging compared to claim 1 of the above-mentioned patent application. In order to clarify the differences between the claimed invention and the features of the citation and to achieve a clear differentiation from the known state of the art, the main claim was clarified both in its preamble and in the characterizing part.
Eine Auswirkung auf Beschreibung und Zeichnungen ist mit der Änderung nicht verbunden.The change does not affect the description and drawings.
Die Anmelderin hofft, daß mit dem neu formulierten An¬ spruch Neuheitswert und Erfindungshöhe eindeutiger zum Ausdruck kommen. The applicant hopes that the newly formulated claim will express the novelty value and level of invention more clearly.
EP92901301A 1991-01-28 1991-12-18 Procedure for the identification of transmitter or region in common-wave broadcasting networks Expired - Lifetime EP0569374B1 (en)

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DE4102408A DE4102408A1 (en) 1991-01-28 1991-01-28 PROCESS FOR TRANSMITTER OR REGIONAL IDENTIFIER IN SAME-WAVE NETWORKS
PCT/EP1991/002438 WO1992013403A1 (en) 1991-01-28 1991-12-18 Procedure for the identification of transmitter or region in common-wave broadcasting networks

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US5544198A (en) 1996-08-06
DE4102408C2 (en) 1993-05-13

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