EP1063799A1 - Méthode de mesure pour réseau à fréquence unique et dispositif afférent - Google Patents

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

Definitions

  • the present invention relates to a measuring method for single-frequency networks and suitable devices.
  • the present 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.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
EP99810552A 1999-06-22 1999-06-22 Procédé de mesure pour réseaux monofréquence et dispositif afférent Expired - Lifetime EP1063799B1 (fr)

Priority Applications (3)

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

Applications Claiming Priority (1)

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

Publications (2)

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

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EP99810552A Expired - Lifetime EP1063799B1 (fr) 1999-06-22 1999-06-22 Procédé de mesure pour réseaux monofréquence et dispositif afférent

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EP (1) EP1063799B1 (fr)
AT (1) ATE247348T1 (fr)
DE (1) DE59906593D1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005050882A1 (fr) * 2003-11-21 2005-06-02 Rohde & Schwarz Gmbh & Co. Kg Procede et dispositif de surveillance de la stabilite de la frequence porteuse d'emetteurs dans un reseau de frequences communes
WO2005029736A3 (fr) * 2003-09-11 2005-07-07 Rohde & Schwarz Procede de controle de la synchronisation temporelle d'emetteurs dans un reseau sur frequence commune
FR2891427A1 (fr) * 2005-09-23 2007-03-30 Tdf Sa Procede de diffusion de donnees permettant de mesurer la synchronisation d'emetteurs, systeme, emetteur et programme correspondants.
FR2927756A1 (fr) * 2008-02-19 2009-08-21 Tdf Soc Par Actions Simplifiee Reseau de transmission synchrone de donnees et procede de surveillance d'un tel reseau.
FR2937202A1 (fr) * 2008-10-15 2010-04-16 Tdf Systeme de surveillance d'un reseau de transmission synchrone
EP1901454A3 (fr) * 2006-09-14 2013-06-26 Kabushiki Kaisha Toshiba Système de diffusion numérique, et transmetteur de diffusion et dispositif de surveillance à utiliser dans le système
EP1748587A3 (fr) * 2005-07-29 2014-07-30 Anritsu Company Appareil et procédé pour analyser un signal de radiodiffusion numérique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5602832A (en) * 1993-09-22 1997-02-11 Northern Telecom Limited Receiver device for code division multiplex communication system
US5617411A (en) * 1991-11-26 1997-04-01 Daimler Benz Ag Method for digital data transmission in the zero symbol of COFDM modulation method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5617411A (en) * 1991-11-26 1997-04-01 Daimler Benz Ag Method for digital data transmission in the zero symbol of COFDM modulation method
US5602832A (en) * 1993-09-22 1997-02-11 Northern Telecom Limited Receiver device for code division multiplex communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"RADIO BROADCASTING SYSTEMS;DIGITAL AUDIO BROADCASTING (DAB) TO MOBILE, PORTABLE AND FIXED RECEIVERS", EUROPEAN TELECOMMUNICATION STANDARD, PAGE(S) 1-206, XP000668972 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO2005029736A3 (fr) * 2003-09-11 2005-07-07 Rohde & Schwarz Procede de controle de la synchronisation temporelle d'emetteurs dans un reseau sur frequence commune
CN100561898C (zh) * 2003-09-11 2009-11-18 罗德施瓦兹两合股份有限公司 用于监控公共波网络中发射机的同步的方法
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
WO2005050882A1 (fr) * 2003-11-21 2005-06-02 Rohde & Schwarz Gmbh & Co. Kg Procede et dispositif de surveillance de la stabilite de la frequence porteuse d'emetteurs dans un reseau de frequences communes
CN100596040C (zh) * 2003-11-21 2010-03-24 罗德施瓦兹两合股份有限公司 用于监控公共波网络中发射机的载波频率稳定性的方法和装置
EP1748587A3 (fr) * 2005-07-29 2014-07-30 Anritsu Company Appareil et procédé pour analyser un signal de radiodiffusion numérique
WO2007036485A3 (fr) * 2005-09-23 2007-05-31 Tdf Mesurer la synchronisation d’emetteurs dans un reseau a frequence unique a l’aide d’une reference externe
FR2891427A1 (fr) * 2005-09-23 2007-03-30 Tdf Sa Procede de diffusion de donnees permettant de mesurer la synchronisation d'emetteurs, systeme, emetteur et programme correspondants.
EP1901454A3 (fr) * 2006-09-14 2013-06-26 Kabushiki Kaisha Toshiba Système de diffusion numérique, et transmetteur de diffusion et dispositif de surveillance à utiliser dans le système
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
CN104796791A (zh) * 2006-09-14 2015-07-22 株式会社东芝 数字广播系统和在该系统中使用的广播装置及监视装置
FR2927756A1 (fr) * 2008-02-19 2009-08-21 Tdf Soc Par Actions Simplifiee Reseau de transmission synchrone de donnees et procede de surveillance d'un tel reseau.
EP2093910A3 (fr) * 2008-02-19 2009-12-09 Tdf Réseau de transmission synchrone de données et procédé de surveillance d'un tel réseau.
FR2937202A1 (fr) * 2008-10-15 2010-04-16 Tdf Systeme de surveillance d'un reseau de transmission synchrone
EP2178229A1 (fr) * 2008-10-15 2010-04-21 Tdf Système de surveillance d'un réseau de transmission synchrone

Also Published As

Publication number Publication date
DE59906593D1 (de) 2003-09-18
EP1063799B1 (fr) 2003-08-13
ATE247348T1 (de) 2003-08-15

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