EP1845642B1 - Procédé et dispositif pour la réception d'un signal radiophonique DVB-T - Google Patents

Procédé et dispositif pour la réception d'un signal radiophonique DVB-T Download PDF

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Publication number
EP1845642B1
EP1845642B1 EP07007152.7A EP07007152A EP1845642B1 EP 1845642 B1 EP1845642 B1 EP 1845642B1 EP 07007152 A EP07007152 A EP 07007152A EP 1845642 B1 EP1845642 B1 EP 1845642B1
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EP
European Patent Office
Prior art keywords
evaluation
symbol
decoding
reception
data
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.)
Not-in-force
Application number
EP07007152.7A
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German (de)
English (en)
Other versions
EP1845642A3 (fr
EP1845642A2 (fr
Inventor
Michael Professor Dr. Silverberg
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 AG
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Grundig Multimedia AG
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Publication date
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Priority to PL07007152T priority Critical patent/PL1845642T3/pl
Publication of EP1845642A2 publication Critical patent/EP1845642A2/fr
Publication of EP1845642A3 publication Critical patent/EP1845642A3/fr
Application granted granted Critical
Publication of EP1845642B1 publication Critical patent/EP1845642B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving

Definitions

  • the present invention relates to a method for receiving a DVB-T radio reception signal according to the features of the preamble of patent claim 1.
  • DVB-T transmission methods and associated data are well known (ETSI EN 300 744).
  • the source coding is done with MPEG 2 or MPEG 4. Due to this data compression several programs can be transmitted in one channel.
  • the Kanalbandbeite lies between 6 MHz and 8 MHz, depending on the frequency grid.
  • the entire data of a multiplex is subjected to channel coding after channel coding. This is done by dividing the bandwidth into several individual carriers by means of a special modulation method, the COFDM method. Each of these individual carriers is then modulated again using one of the three modulation methods defined for DVB-T, QPSK, 16 QAM or 64 QAM.
  • the problem with the transmission of the DVB-T signals is the multipath propagation, which arises functionally in the emission due to multiple reflection.
  • Multipath propagation is unavoidable and technically conditioned in terrestrial networks. This results in the receiver corresponding echoes or interference, which are to be compensated by the receiver or in the receiver.
  • DVB-T incorporates multiple error protection. There is external error protection (block code), with 16 bytes of redundancy being added to each data packet consisting of 188 bytes. Furthermore, a bit interleaving takes place against burst errors.
  • an internal error protection is provided by means of a convolutional coding is made. This allows the robustness against disturbances to be set, as is necessary for the various intended reception paths, for example for mobile reception, portable reception or stationary reception of DVB-T signals.
  • the transmitter network and the receiver must be matched to each other.
  • the data transmission then takes place in each case in packets with the symbol duration T S.
  • the usable symbol duration T U is in a fixed ratio to the distance between the individual carriers to each other.
  • the entire symbol duration T S is divided into a so-called guard interval T G and a useful range T U.
  • the guard interval has the task of giving the receiver a certain settling time until the useful data in the useful range of the signal can be evaluated and these can be decoded.
  • EP 1 276 289 A2 and EP 1 331 783 A2 In each case a method for receiving COFDM signals is known. With these methods, the evaluation window is pushed to the guard interval of the next symbol. If an interference interference is then detected, the evaluation window is pushed back in order to position it in the range of the usable symbol duration. In this case, however, the evaluation window is not advanced in the range of the guard interval of the symbol duration in order to avoid interference or to stop continuously occurring interference.
  • the object of the present invention is to use the guard interval intelligently for the signal reception and to improve and increase the usable duration of the signal and thus to improve the reception, in particular when used in mobile DVB-T receivers.
  • the subject of this invention is concerned with the OFDM technique, more specifically with the intelligent use of guard interval and payload of the transmitted symbol.
  • the methods of channel coding remain unaffected.
  • the useful range is fixed when transmitting DVB-T signals.
  • the useful range must be taken from the symbol duration. In conventional receivers, this is done by detecting the beginning of the guard interval and decoding the signals of the useful range when the end of the guard interval is detected from this point in time.
  • the present invention takes a different approach.
  • the symbol duration T S of a DBV-T signal which is composed of the guard interval and the useful range, is no longer considered static.
  • the useful range T U can be located arbitrarily in the symbol duration T S , ie also at the beginning of the symbol.
  • T U is in a fixed relationship to the distance of the subcarrier each other. It is the start of the entire symbol of the DVB-T signal detected .. It is immediately after the start of the recognition of the symbol with the decoding started and it is not waited until the Guard interval is completed. For this purpose, a first window which corresponds to the width of the useful area T U is evaluated. This first window is adjusted accordingly for each symbol that is received.
  • a further advantageous embodiment of the invention is continuously, temporally offset, shifted the evaluation window over the entire symbol duration and evaluated. It is then created a statistic from which determines an optimal location of the evaluation window for the payload, which is then used for later reception.
  • the basis for the statistics is the bit error rate after the convolutional decoding and the signal form of a symbol in the time domain and / or in the frequency domain.
  • the evaluation takes place in such a way that the data, which are respectively taken from the evaluation window, are stored and compared with one another. In particular, an error comparison can be made thereby and a stochastic evaluation of the received data can be carried out.
  • a corresponding receiver using the proposed method can prediction or estimate these errors in advance or compensate for these errors in a predictive manner or with a prediction.
  • the stochastic data can be evaluated in particular with a Kalman algorithm and used for intelligent diversity.
  • each symbol is correspondingly evaluated and the reception window is dynamically shifted over the symbol during reception.
  • interference is detected or evaluated by means of Viterbi decoding. Interference patterns that exist over time can thus be compensated.
  • an interference compensation when using a plurality of antennas, which receive the same signal, can thus be carried out advantageously an interference compensation.
  • the described method is performed. For this purpose, then several receiving units are provided. The received symbols are then compared with each other via another device. If the knowledge now exists that, for example, every thirtieth symbol is disturbed when received over the first antenna, upon further reception every 30th symbol in this antenna is blanked out and replaced by the data which originate from another antenna and correspond to this symbol , In so far can be done by an intelligent interconnection of the antennas and a corresponding signal processing, a compensation of errors.
  • FIG. 1 the structure of a COFDM modulated data signal is shown schematically in the time domain, which is used in the DVB-T transmission.
  • This data signal has a uniform symbol duration T S.
  • the symbol duration T S is divided into the guard interval T G and the useful range T U.
  • the guard interval T G is used to wait until all signals (due to the multipath reception) lead to a stationary signal at the receiver after the beginning of the symbol, so that the signal evaluation can be started.
  • a conventional receiver begins to decode the useful data from the useful range T U after the end of the guard interval T G.
  • FIG. 2 again shows the COFDM modulated data signal, shown in the time domain, a temporal portion thereof, especially the symbol duration T S and an evaluation window 1.
  • the evaluation window 1 begins with completion of the guard interval T G and ends with the end of the useful area T U. In this evaluation window 1, the decoding of the data of the use area T U is made.
  • the evaluation window 2 which is the same length as the evaluation window 1 in FIG. 2 , does not begin with completion of the guard interval T G , but extends into the guard interval T G.
  • the evaluation window 2, which is used here, is the same length of time as the evaluation window normally used, but it already extends into the guard interval T G. This is particularly advantageous when there are problems. If, for example, there are disturbances in the useful range T U at the end of this useful range T U , then the evaluation window 2 can be correspondingly moved forward so that the disturbances are not in the evaluation window 2.
  • the decoding with the first receiver and a corresponding evaluation window 2 already in the guard interval T G begins, in the following with a second receiver the Decoding to start only with completion of the guard interval T G and an evaluation window 1 and to analyze only the useful range T U.
  • the respective evaluation window F1 to FN can be moved freely over the entire symbol duration T S. This shift occurs at equidistant intervals over time.
  • the evaluation window F1 to FN can thus use the entire symbol duration T S.
  • evaluation window F1 to FN is shifted in time. This takes place N times until the evaluation window N is present.
  • Each signal, which by means of each of the Receive window F1 to FN is decoded and statistically analyzed. In this case, the optimum reception window F1 to FN can then be determined and this is used later for reception in the case of a static receiver. In this way, it is possible to compensate for disturbances that may be present in the useful range T U by shifting the evaluation window F1 to FN within the symbol duration T S.
  • FIG. 5 the schematic structure of a data terminal with multiple antennas A1 to AN at least one receiving units E and a control unit DE shown.
  • the antennas A1 to AN are all connected in parallel with the reception to the receiving unit E.
  • the receiving unit E is in communication with the control unit DE.
  • the control unit DE controls the receiving unit E in such a manner that the receiving unit E uses the individual antennas A1 to AN respectively for reception.
  • the method according to the invention is now applied as follows, in particular in the case of a mobile receiver.
  • the control unit DE controls the receiving unit E in such a way that over a predetermined period of time in each case with one of the antennas A1 to AN a reception is made.
  • the control unit DE starts the receiving unit E in such a way that it receives the incoming signals, for example via the antenna A1 over a predefined period of time. After a predefined time, the control unit DE controls the receiving unit E such that the next antenna, for example the antenna A2 is used, etc., until the last reception via the antenna AN.
  • the evaluation window is shifted in accordance with the method and in accordance with the invention over the entire symbol duration TB of the received signal.
  • the received data are statistically analyzed, in particular subjected to an error analysis. This is done as described by means of a Viterbi algorithm or another known stochastic evaluation algorithm.
  • all antennas A1 to AN which are connected, evaluated and recorded and evaluated in their receiving characteristics.
  • this can also take place during the reception; in that respect, for each of the individual antennas A1 to AN and possibly for a plurality of available receivers, which are then controlled in parallel.
  • the received data is stored and later compared and evaluated. In this way, it is possible over a period of time to obtain a statistical analysis of the quality of the received data signals.
  • the reception via another Antenna takes place.
  • the data terminal DE controls the receiver E such that in each case it is predestined from the outset which of the antennas A1 to AN is used to receive the data signal.
  • the receiving unit E thus switches on the basis of the predictively predetermined reception periods, wherein the specification originates from the control unit DE, the individual antennas A1 to AN on reception. This makes it possible to compensate for disturbances which are present periodically.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (7)

  1. Procédé de décodage d'un signal radio transmis numériquement, qui contient des paquets de données, les paquets de données comprenant des symboles et chacun une durée de symbole (Ts), la durée de symbole (TS) étant divisée en un intervalle de garde (TG) et une partie de données utiles (TU) et, extrait les données décodées à l'aide d'un décodage des données transmises dans la durée de symbole (TS) à l'intérieur d'une fenêtre d'analyse (2), le démarrage de chaque symbole étant détecté et le décodage étant commencé après la détection de celui-ci, de façon à ce que la fenêtre d'analyse (2) s'étende dans l'intervalle de garde (TG) de la durée de symbole (TS) du symbole, le décodage étant répété plusieurs fois en décalant la fenêtre d'analyse (2) sur toute la durée du symbole (Ts),
    caractérisé en ce que
    les données obtenues lors du décodage répété plusieurs fois sont stockées, comparées entre elles et, à l'aide d'un algorithme d'analyse, une position optimale de la fenêtre d'analyse (2) à l'intérieur de la durée du symbole (TS) est déterminée, des perturbations dans la partie de données utiles (TU) ne se trouvant pas dans la fenêtre d'analyse (2) lors de la position optimale de la fenêtre d'analyse (2).
  2. Procédé selon la revendication 1
    caractérisé en ce que
    le décalage de la fenêtre d'analyse (2) est effectué à des intervalles de temps équidistants.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    le signal de réception radio est un signal radio DVB-T.
  4. Procédé selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que
    le procédé est utilisé sur des récepteurs mobiles.
  5. Procédé selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que
    dans le cas de plusieurs antennes de réception (A1 à AN), une analyse stochastique des données reçues a lieu et, dans le cas de perturbations périodiques, la réception a lieu par l'antenne (A1 à AN) qui présente, selon l'analyse stochastique sur la base des données reçues précédentes, la meilleure réception.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    la meilleure réception est déterminée à l'aide d'un algorithme de Viterbi et/ou d'une estimation de probabilité de la forme de symbole dans le domaine de temps et/ou de fréquence.
  7. Dispositif pour l'exécution du procédé selon la revendication 1 avec au moins une antenne (A1 à AN), au moins une unité de réception, une mémoire et une unité de commande (DE), l'unité de commande (DE) surveillant un taux d'erreurs de bits selon un décodage à convolution et la forme de signal d'un symbole dans le domaine de temps et/ou de fréquence et déterminer les perturbations et leur analyse à l'aide d'un décodage de Viterbi.
EP07007152.7A 2006-04-11 2007-04-05 Procédé et dispositif pour la réception d'un signal radiophonique DVB-T Not-in-force EP1845642B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07007152T PL1845642T3 (pl) 2006-04-11 2007-04-05 Sposób i urządzenie do odbioru radiofonicznego sygnału odbiorczego DVB-T

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006017347A DE102006017347B4 (de) 2006-04-11 2006-04-11 Verfahren zum Empfang eines DVB-T Rundfunkempfangssignals

Publications (3)

Publication Number Publication Date
EP1845642A2 EP1845642A2 (fr) 2007-10-17
EP1845642A3 EP1845642A3 (fr) 2008-05-28
EP1845642B1 true EP1845642B1 (fr) 2016-02-17

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Application Number Title Priority Date Filing Date
EP07007152.7A Not-in-force EP1845642B1 (fr) 2006-04-11 2007-04-05 Procédé et dispositif pour la réception d'un signal radiophonique DVB-T

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EP (1) EP1845642B1 (fr)
DE (1) DE102006017347B4 (fr)
ES (1) ES2571930T3 (fr)
PL (1) PL1845642T3 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753024B1 (fr) * 1996-08-27 1998-12-31 France Telecom Dispositif et procede de reception d'un signal amrf constitue de frequences porteuses emises par au moins deux terminaux, et systeme de transmission correspondant
KR100833223B1 (ko) * 2001-07-11 2008-05-28 삼성전자주식회사 보호 구간을 이용해 심볼 타이밍 동기를 수행하는ｏｆｄｍ 수신 시스템 및 그 방법
KR100406975B1 (ko) * 2002-01-29 2003-11-28 삼성전자주식회사 오에프디엠수신기의 심볼 타이밍 복원장치 및 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SPETH M ET AL: "Frame synchronization of OFDM systems in frequency selective fading channels", VEHICULAR TECHNOLOGY CONFERENCE, 1997, IEEE 47TH PHOENIX, AZ, USA 4-7 MAY 1997, NEW YORK, NY, USA,IEEE, US, vol. 3, 4 May 1997 (1997-05-04), pages 1807 - 1811, XP010229079, ISBN: 978-0-7803-3659-9, DOI: 10.1109/VETEC.1997.605870 *

Also Published As

Publication number Publication date
EP1845642A3 (fr) 2008-05-28
PL1845642T3 (pl) 2016-07-29
EP1845642A2 (fr) 2007-10-17
DE102006017347A1 (de) 2007-10-25
ES2571930T3 (es) 2016-05-27
DE102006017347B4 (de) 2008-11-27

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