EP1993222B1 - Verfahren, das eine Mobil-TV-Ausstrahlung mit derselben Frequenz ermöglicht, bei der die Interferenzen bei Normalfernseh-Empfängern minimiert wird - Google Patents

Verfahren, das eine Mobil-TV-Ausstrahlung mit derselben Frequenz ermöglicht, bei der die Interferenzen bei Normalfernseh-Empfängern minimiert wird Download PDF

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Publication number
EP1993222B1
EP1993222B1 EP08290317A EP08290317A EP1993222B1 EP 1993222 B1 EP1993222 B1 EP 1993222B1 EP 08290317 A EP08290317 A EP 08290317A EP 08290317 A EP08290317 A EP 08290317A EP 1993222 B1 EP1993222 B1 EP 1993222B1
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Prior art keywords
radio
transmitter
transmitters
broadcasting
power
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French (fr)
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EP1993222A2 (de
EP1993222A3 (de
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François Vincent
Bernard Lehembre
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Societe Francaise du Radiotelephone SFR SA
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Societe Francaise du Radiotelephone SFR SA
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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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  • the present invention relates to cellular radio networks and is intended to provide a radio coverage that can broadcast programs for example according to DVB-H (Digital Video Broadcast - Handheld) or other standards of mobile broadcasting. More particularly, the present invention relates to a method of establishing a radio coverage for digital broadcasting with a single UHF (Ultra High Frequencies) frequency to mobile radio terminals over a wide territory and minimizing interference generated on fixed TV receivers. analog or digital. The invention also relates to a broadcast network (for example DVB-H) addressing the mobile terminals in the UHF band and for reducing the interference generated on the fixed TV receivers.
  • DVB-H Digital Video Broadcast - Handheld
  • Digital transmission technologies such as DVB-T (Digital Video Broadcasting - Terrestrial) digital-terrestrial video broadcasting for Europe and Integrated Services Digital Broadcasting (Terrestrial) digital broadcasting for Japan, have enter the TV broadcast in the digital age.
  • DVB-T Digital Video Broadcasting - Terrestrial
  • Tele Services Digital Broadcasting Terestrial
  • the emerging DVB-H standard is a further step from the DVB-T standard, making it possible to receive digital broadcasting via mobile terminals. We must now distinguish fixed TV from mobile TV.
  • DVB-H networks require from the design stage to consider the characteristics of the particular conditions of use in the receiving the TV via a portable and mobile receiver. Like mobile telephony, it must be taken into account that these uses occur mainly inside buildings and on the move.
  • TNT-type television and analogue television generally have transmitters and receivers with the same location. Their protection ratios and their respective powers ensure correct operation of the one and the other even on adjacent channels.
  • DVB-H technology which reduces the consumption of mobile terminals thanks to the Time Slicing technology
  • 10 to 20 times more sites are needed to provide radio coverage. This is due to the lack of rooftop gain antennas and propagation losses to provide indoor coverage inside buildings.
  • the coexistence between DVB-T and DVB-H on adjacent or more distant channels in the band is difficult to achieve because there may be such a difference in field between the fixed reception (intended to be received by a roof antenna ) and mobile reception in an apartment that the DVB-T receivers may become desensitized when the fixed receiving antenna is close enough to the DVB-H transmit antenna.
  • a fixed TV receiver is close to a DVB-H transmitter and further away from a DVB-T transmitter simply because a DVB-H network comprises 10 to 20 times more sites than a DVB-T network.
  • the standard specifying the manufacturing of the receivers indicates that the field differential must not exceed 29dB whereas in the case DVB-H / DVB-T, the differential is 39dB minimum.
  • the latter consists of reissuing all fixed TV channels from each DVB-H transmitter, in order to maintain a sufficient protection ratio.
  • This method has the disadvantage of being complex and expensive.
  • the object of the present invention is therefore to eliminate one or more of the disadvantages of the prior art by defining a method of establishing, via a network, a radio coverage allowing a distribution over a very wide area with a single UHF frequency, eg DVB-H or any other digital broadcast standard, minimizing interference to fixed TV receivers and ensuring appropriate quality of service for subscribers.
  • a single UHF frequency eg DVB-H or any other digital broadcast standard
  • the invention thus makes it possible to minimize or eliminate any jamming zones.
  • the collinear arrangement of the mobile TV broadcast oriented beams and the analog / digital TV (fixed TV) receiving antennas makes it possible to obtain an additional decoupling of at least 10 to 15 dB with respect to a random arrangement that would result conventional multidirectional engineering or in some cases the main radiation of the mobile TV broadcast secondary sites would be in the main beam of fixed TV reception antennas.
  • the method thus facilitates the deployment of a DVB-H type network over a large area, for example the size of a region or even whole France, and more generally over large geographical areas.
  • the process simplifies the engineering of the sites to be implanted in the context of DVB-H networks based on a large number of repeaters (or re-transmitters), which can be installed on sites of origin of cellular telephony.
  • a satisfactory mobile TV radio coverage can be obtained without a significant increase in the number of sites (whereas the radiation of the secondary sites is no longer multidirectional) and without disturbing the terrestrial reception by antenna.
  • the method according to the invention therefore provides a solution to allow reuse the same frequency without significant inconvenience or constraint as to the surface area to be served, minimizing the number of transmitters needed to establish the radio coverage.
  • the orientation step towards the broadcasting equipment is carried out for all said directional peripheral transmitters.
  • Mobile TV network engineering is thus carried out in which each of the antennae of the transmission sites is oriented towards the main TV transmitter in the UHF band (that is to say with a collinear orientation with the TV reception antennas. each point of the coverage area).
  • the orientation step is performed during the installation of each of the directional peripheral emitters.
  • the step of extending the radio coverage is performed concentrically around the location of said first transmitter (the radio transmission made by the first transmitter can be broadcast in at least two directions opposing privileges and more generally omnidirectionally).
  • the power of the first transmitter is between 1 kW and 10 kW, while the power of each directional peripheral transmitter is two to two hundred times less than the power of the first transmitter.
  • the installation step of the system is performed in a plurality of coexistence zones each associated with a broadcasting equipment for fixed TV programs, said first implementation step being carried out for each of the equipment, step d orienting directional peripheral transmitters of two adjacent adjacent coexistence zones to be oriented substantially back-to-back or more generally, to be oriented differently to each of the fixed-TV broadcast transmitters.
  • the peripheral transmitters form respective radio cells together defining a radio coverage extending the radio coverage allowed by said first transmitter, the peripheral transmitters being digital broadcast transmitters arranged at a maximum of forty meters from the ground.
  • Another object of the invention is to provide a network adapted to allow broadcasting over an extended territory, providing continuous coverage that takes into account the problem of interference with fixed TV transmission networks.
  • two adjacent crowns of different concentricities have the directions of the secondary transmitters oriented towards a fixed TV transmitter, the secondary transmitters of a first of said two adjacent rings having their direction directed towards the fixed TV transmitter corresponding to the center of concentricity of said first ring, the secondary emitters of a second of said two adjacent rings having their direction directed towards the fixed TV transmitter corresponding to the center of concentricity of said second ring.
  • the transmitting sites are arranged to send frames constituting an OFDM modulated symbol with a guard interval corresponding to a fraction comprised between a quarter and an eighth of the transmission time of an OFDM symbol, the size of cells being determined in particular according to the guard interval, a transmission power, an environmental criterion representative of multipath frames sent, and a distance corresponding to a threshold of appearance of interference.
  • a TV broadcasting network addressing mobile terminals in the UHF band is realized with an arrangement of secondary transmitter sites (2) around a main transmission site.
  • the same UHF frequency is used.
  • This SFN (Single Frequency Network) network minimizes the interference generated on analogue or digital fixed TV receivers.
  • the network according to the invention has the particularity of having a specific orientation of the peripheral transmitter (2) to a device of broadcasting (3), main fixed TV transmitter.
  • the figures 2 and 3 illustrate the problems encountered when deploying a mobile TV network, for example DVB-H, when the UHF spectrum is shared with fixed TV (DVB-T and analog TV).
  • DVB-H mobile TV network
  • a multidirectional transmitter can be co-located with the main fixed TV transmitting transmitter (3). This provides basic coverage at a lower cost. This site is then close to the analogue and TNT broadcast point.
  • intrazone interference (B1) appears for antennas (4) of fixed TV remote from the transmitter (3) analog or TNT and close to one of the secondary DVB-H transmitters.
  • the network according to the invention advantageously takes into account this problem since a reduction of the interference is obtained by radiating the complementary transmitters (2) only in the direction of the transmitter (3) of the main site (generally this is the site "high"), and concentrating most of the radiated energy.
  • Interzone interference (B2) is illustrated. As the frequency plans are interleaved, always transmitting SFN (with the same UHF frequency) within the allotment zone makes the interference (B2) on neighboring areas more likely.
  • a transmitter (E) secondary DVB-H multidirectional or multi-sector radiation will indeed cause interference (B2) on antennas (4) receiving conventional TV oriented to this transmitter (E) secondary.
  • the two aforementioned problems can be advantageously and effectively solved according to the invention, while maintaining the operation of a "high" site co-located with the fixed TV transmission equipment (3) to offer a broad basic coverage, cheaper.
  • the cover holes are plugged differently, using transmitters (2) secondary peripherals beam oriented in a single preferred direction.
  • a novel method of establishing a radio coverage is thus achieved, enabling digital broadcasting with a single UHF frequency to mobile radio antenna terminals.
  • the system implanting a plurality of transmitters (1, 2) for digital TV broadcast for mobile TV extends in particular to one or more zones (Z) of coexistence with equipment (3) for broadcasting fixed TV programs radiating signals to fixed antennas (4) of television. These antennas (4) are typically oriented towards this broadcasting equipment (3).
  • the step (52) of extending the radio coverage (Cv) can be performed concentrically around the location of the first transmitter (1).
  • the radio transmission made by said first transmitter (1) can typically be broadcast in several opposite privileged directions. Only this first transmitter (1), in the coexistence zone (Z), has a multidirectional or multisectorial radiation.
  • each of the peripheral emitters (2) has an orientation along an axis of symmetry which reaches the same central point as the orientation of the fixed antennas (4).
  • the privileged orientation directions of these antennas (4) and peripheral transmitters (2) compete at the same point in the coexistence zone (Z).
  • the power of the first transmitter (1) can be between 1 kW and 10 kW, while the power of each of the directional peripheral emitters (2) is approximately two to two hundred times lower than the power of the first emitter (1).
  • the peripheral transmitters (2) may simply have an effective radiated power of one hundred or five hundred watts, for example. It is understood that the power of the first transmitter (1) will remain much lower than the power of the equipment (3) dedicated to the analog fixed TV and will remain less than or equal to the power of the equipment (3) dedicated to DTT, for example not exceeding a ratio 1/5 relative to the expected power for the analog fixed TV.
  • the method may provide an addition step (54) for stationary television antennas oriented towards the peripheral transmitter installed, a filtering function relating to said UHF frequency used.
  • This adding step (54) may be useful in a (rare) case where the fixed antennas (4) are oriented differently or to further reduce the disturbances.
  • This adding step (54) can be used also punctually in a case where one of the emitters is oriented deviated with respect to the first emitter (1) and risks jamming a reduced number of fixed antennas (4) placed near.
  • the adding step (54) is performed during or after the installation of each of the directional peripheral emitters (2). These filters are keyed on the frequency band used, it is understood that adaptations or filter changes can be made in case of frequency change.
  • This adding step (54) can thus be used only as a point complement, to avoid making the system too complex.
  • the step (53) of orientation towards the first transmitter (1) is performed for all directional peripheral transmitters (2).
  • This orientation step (53) is performed for example during the installation of each of the directional peripheral emitters (2). It can also be done by modifying existing transmitters.
  • the respective radiation diagrams of the DVB-H transmission and TV reception sites provide additional protection for the fixed receivers (analog and TNT) of 10 to 300 dB sufficient to reduce occurrences of cases of interference to a marginal number. This makes it possible to respond to the problematic illustrated in figure 2 for antennas (4) fixed in the vicinity and to that illustrated in FIG.
  • the peripheral transmitters (2) of the sites bordering the allotment zone necessarily turn their backs on the neighboring transmitters (2) closer.
  • the step (53) of Orientation allows directional peripheral emitters (2) of two distinct coexistence zones to be oriented back-to-back. This not only provides additional protection for antennas (4) fixed within the same zone (Z), but also a protection complement in the case of neighboring zones (Z1, Z2, Z3) each having a transmitter ( 1) DVB-H surrounded by rings of transmitters (2) peripherals.
  • Orthogonal Frequency Duplexing is a method of digital signal modulation that is used, among other things, for high-speed mobile data transmission systems.
  • OFDM is particularly well suited to radio transmission channels with multiple wave transmissions (echoes) due to reflections of waves on obstacles. Indeed, when they combine, the multiple transmissions modify or even destroy the transmitted signal and cause the same signal to be received several times with offset times.
  • the signal is multiplexed over a large number of subcarriers, so that the rate on each of the subcarriers is reduced. It is recalled here that a given symbol (S) conveys a certain number of information bits. Thus, the symbol time is increased due to the bit rate reduction for the subcarriers and it is possible to limit the risk of intersymbol interference.
  • the frequency spacing f u is the inverse of the useful period T u (or active period) of the symbol during which the receiver integrates the demodulated signal.
  • T u or active period
  • the OFDM provides between each symbol a non-informative delay of the information allowing the reception the integration of all the signals received.
  • guard interval GI, Fig. 5
  • OFDM properties which naturally allow adaptation to propagation multitrafts specific to urban environments and / or communication with mobiles, are advantageously used to create a network according to the invention to enable the same information to be broadcast from several different transmitters, and that with the same frequency.
  • FR 2,890,820 the same applicant mentions a method for optimally establishing DVB coverage, eg DVB-H, or any other analog digital broadcast over an SFN network.
  • the process taught in this document FR 2,890,820 can be used to define radio coverage for DVB broadcasting with a single UHF frequency, via a network with a plurality of base station transmitting means for generating radio cells, and without limitation of surface to cover. All transmitters (1, 2) are precisely synchronized in frequency and are synchronized in time at each symbol (S). The content broadcast is also strictly identical.
  • peripheral transmitters (2) form respective radio cells (20) together defining a radio coverage extending the radio coverage (Cv) allowed by said first transmitter (1).
  • These peripheral transmitters (2) are transmitters of relatively low power digital broadcasting and can be arranged at a maximum of about forty meters from the ground, unlike broadcasting broadcast transmitters which are generally placed at a hundred meters from the ground. floor at least (300 meters high for transmitters of the Eiffel Tower).
  • the invention allows the design of a network for radiocommunication broadcasting, containing at least one TV program, for mobile phones and other mobile terminals.
  • the architecture of the The network is of the radiotelephone type and makes it possible, thanks to the transmitting sites (1, 2), to define a continuous radio coverage over a vast territory. All the sending sites are parameterized with the same UHF frequency and are arranged to send the frames with a guard interval (Gl) corresponding, for example, to a fraction comprised between a quarter and an eighth of the transmission duration of an OFDM symbol.
  • Gl guard interval
  • the size of the cells (20) is determined in particular according to the guard interval (GI), a transmission power, an environmental criterion (urban, rural, etc.). ) representative of the multiplicity of paths of the frames sent, and a threshold distance of occurrence of interference.
  • the non-carrier duration of the signal corresponding to the guard intervals (GI) does not exceed one quarter of the transmission duration of a frame constituting an OFDM modulated symbol. Thus, the available bandwidth will not be reduced too much.
  • the Nth crown is formed of 6 * N cells.
  • the guard time (GI) is fixed, for example by taking a quarter of the symbol time (S) and reasoning on the hexagonal model in flat terrain, it is possible to determine the crown with destructive interference.
  • the relative delay (10) is less than one symbol period, only a part of the signal transmitted on this path acts as a scrambling, since it does not than information belonging to the previous symbol. The remainder conveys information of the useful symbol, but can be constructively or destructively added to the information of the main path.
  • Modeling may consider a rural-type environment in which transmitters may be further apart than in urban areas. For example, for an inter-site distance of 10 km, the sites being all synchronized, it appears that the emissions of the first five crowns are received within the "window" of the on-call time (less than 80% of the window is used). These emissions (cells (22)) participate in the network gain and therefore do not exhibit destructive interference.
  • the distance of 10 km corresponds (with a propagation taken at the speed of light) to a time difference of 33.3 ⁇ s between a site and the first ring of surrounding sites in a fully meshed hexagonal topology (100% pixels).
  • the teaching of the document FR 2,890,820 is concerned with establishing a "no-hole" coverage to allow the user to receive digital broadcast programs at any point in a cell.
  • This teaching also applicable here for the development of an extended SFN network, will not be detailed here.
  • the network according to the invention can therefore be deployed over a large territory where a fixed TV transmission network already exists, taking into account the scarcity of resources (few free frequencies) and the problems of interference that this may cause. .
  • the network takes into account the specifications of the DVB-H standard, which provides for 45 dB receiver discrimination, to avoid the interference problems illustrated in figures 2 and 3 .
  • One of the advantages of the invention is to obtain systematically, via the collinear orientation of the antennas of the secondary digital transmitters (2) and the different fixed TV reception antennas, an additional decoupling of at least 10 to 15 dB more than a random arrangement that would result from conventional engineering.
  • This additional decoupling makes it possible in practice to reduce in a ratio 4 the scrambled surface with equal coverage.
  • it solves most of the residual interference by a simple change of the receiving antenna in favor of an antenna with a superior front / rear protection ratio.
  • This solution to residual interference overcomes the disadvantages of a filtering solution eliminating the UHF channel operated by the secondary transmitter DVB-H, and which would require a re-setting in case of change of said channel, for example during a rearrangement the national frequency plan.
  • An additional advantage of a network according to the invention lies in obtaining better protection of neighboring allotment zones reusing the same channel or a channel adjacent to that operated in mobile TV, for a fixed or mobile coverage. This protection is achieved by the fact that mobile TV repeaters or repeaters located on the edge of the allotment area emit towards the center of the allotment area, providing additional protection of 20 dB to other areas. This advantage can be effectively exploited during the transition phase when analogue TV coexists with digital TV and the frequencies for mobile TV systems remain difficult to release.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
  • Transmitters (AREA)
  • Noise Elimination (AREA)

Claims (11)

  1. Verfahren zur Herstellung einer Funkabdeckung, das eine digitale Fernsehfunkübertragung mit einer einzigen UHF-Frequenz zu mobilen Endgeräten mit Funkantenne erlaubt, das über ein System mit einer Vielzahl digitaler Fernsehfunksender (1, 2) für mobiles Fernsehen umgesetzt wird, das einen Schritt der Einrichtung des Systems in mindestens einer Koexistenz-Zone (Z) mit einer stationären multidirektionalen Funkübertragungsanlage (3) von TV-Programmen umfasst, die Signale zu stationären Fernsehantennen (4) ausstrahlt, die zu dieser Funkübertragungsanlage (3) ausgerichtet sind, wobei die Anlage (3) eine erste effektive abgestrahlte Sendeleistung hat, die größer oder gleich zirka zehn Kilowatt ist, dadurch gekennzeichnet, dass es umfasst:
    - einen ersten Schritt (51) der Aufstellung mindestens eines ersten digitalen multidirektionalen Fernsehfunksenders (1) mit einer zweiten Leistung, die kleiner ist als die erste Leistung und die erste Leistung nicht überschreitet, etwa an derselben Stelle wie die Funkübertragungsanlage (3),
    - einen Schritt (52) der Ausweitung der von der Funkübertragungsanlage (3) erlaubten Funkabdeckung (Cv), wobei zweite periphere digitale Fernsehfunksender (2) geringerer Leistung und mit Strahlenbündel, das in eine bevorzugte Richtung ausgerichtet ist, in aufeinanderfolgenden Kreisen um den ersten Sender (1) herum aufgebaut werden, und
    - um eine Reduzierung von Interferenzen zwischen jedem eingerichteten peripheren digitalen Fernsehfunksender (2) und stationären Fernsehantennen (4) in der Nachbarschaft letzteren zu erlauben, einen Schritt (53) der Ausrichtung der bevorzugten Richtung des Sendestrahlbündels jedes peripheren Senders (2) mit in Richtung der die Zone bedienenden Funkübertragungsanlage (3) ausgerichtetem Strahlenbündel.
  2. Verfahren nach Anspruch 1, wobei der Schritt (53) der Ausrichtung in Richtung der Funkübertragungsanlage (3) für alle peripheren Richtsender (2) durchgeführt wird.
  3. Verfahren nach Anspruch 1 oder 2, wobei der Schritt (53) der Ausrichtung bei der Einrichtung jedes der peripheren Richtsender (2) durchgeführt wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei der Schritt (52) der Ausweitung der Funkabdeckung (Cv) konzentrisch um die Stelle der Aufstellung des ersten Senders (1) erfolgt.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Leistung des ersten Senders (1) zwischen 1 kW und 10 kW inklusive ist, wogegen die Leistung jedes der peripheren Richtender (2) zwei bis zweihundert Mal kleiner als die Leistung des ersten Senders (1) ist.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei der Schritt der Einrichtung des Systems in mehreren Koexistenz-Zonen (Z1, Z2, Z3) durchgeführt wird, von denen jede einer stationären Funkübertragungsanlage (3) von TV-Programmen zugeordnet ist, wobei der Schritt (51) der Aufstellung für jede der Anlagen (3) durchgeführt wird, wobei der Schritt (53) der Ausrichtung peripheren Richtsendern (2) von zwei unterschiedlichen Koexistenz-Zonen erlaubt, etwa Rücken an Rücken ausgerichtet zu sein.
  7. Verfahren nach einem der Ansprüche 1 bis 6, wobei die peripheren Sender entsprechende Funkzellen (20) bilden, die gemeinsam eine Funkabdeckung definieren, die die von dem ersten Sender (1) erlaubte Funkabdeckung (Cv) ausweiten, wobei die peripheren Sender digitale Fernsehübertragungssender sind, die maximal zirka 40 Meter vom Boden entfernt angeordnet sind.
  8. Netzwerk für die Übertragung von Funkkommunikationen, die mindestens ein TV- oder Radioprogramm enthalten, dadurch gekennzeichnet, dass es aus einem Funktelefonienetzwerk besteht, das eine Vielzahl von Senderstandorten umfasst, die jeweilige Funkzellen (20) bilden, die gemeinsam eine Funkabdeckung definieren, und dass alle diese Standorte mit Sendern für die TV- oder Radioübertragung ausgestattet sind und dass sie alle mit einer selben UHF-Frequenz parametriert sind, um jeweils eine Funkzelle zu schaffen, wobei das Netzwerk mindestens eine Koexistenz-Zone (Z) mit einer stationären Funkübertragungsanlage (3) von TV-Programmen umfasst, die eine erste effektive abgestrahlte Sendeleistung von mindestens zirka zehn Kilowatt hat, wobei das Netzwerk in dieser Zone (Z) umfasst:
    - einerseits einen ersten Sender (1) einer zweiten effektiven abgestrahlten Sendeleistung von mindestens gleich 1 kW und unter der ersten Leistung etwa an derselben Stelle wie die Funkübertragungsanlage(3) und
    - andererseits zweite periphere Sender (2) geringerer Leistung und mit in eine bevorzugte Richtung ausgerichtetem Strahlenbündel, wobei alle diese in dieser Zone aufgestellten peripheren Sender in Richtung desselben Punkts ausgerichtet sind, der Stelle der Aufstellung der Funkübertragungsanlage (3) entspricht.
  9. Netzwerk nach Anspruch 8, wobei das Funktelephonienetzwerk erlaubt, mobiles Fernsehen durch Funkkommunikation zu verbreiten und mit einem stationären TV-Übertragungsnetzwerk koexistiert, wobei das Funktelephonienetzwerk besteht aus:
    - einer Vielzahl erster multidirektionaler Sender (1) mit einer geringeren Leistung als die Leistung der stationären TV-Sender, die in der Nähe jedes dieser stationären TV-Sender lokalisiert oder kolokalisiert sind, und
    - einer Vielzahl konzentrischer Kreise sekundärer Sender (2) mit geringerer Leistung als die ersten Sender (1), wobei diese sekundären Sender (2) jeweils Sender mit einem in eine bevorzugte Richtung ausgerichteten Strahlenbündel sind, wobei die bevorzugten Richtungen konvergierend in Richtung jeder Funkübertragungsanlage (3) organisiert sind, die einer Vielzahl von Kreisen derselben Konzentrizität zugeordnet ist.
  10. Netzwerk nach Anspruch 9, wobei bei zwei benachbarten Kreisen unterschiedlicher Konzentrizitäten die Richtungen der sekundären Sender (2) zu einem stationären TV-Sender ausgerichtet sind, wobei die Richtung der sekundären Sender (2) eines ersten der zwei benachbarten Kreise zu dem stationären TV-Sender ausgerichtet ist, der dem Zentrum der Konzentrizität des ersten Kreises entspricht, wobei die Richtung der sekundären Sender (2) eines zweiten der zwei benachbarten Kreise zu dem stationären TV-Sender ausgerichtet ist, der dem Zentrum der Konzentrizität des zweiten Kreises entspricht.
  11. Netzwerk nach einem der Ansprüche 8 bis 10, wobei die Senderstandorte ausgebildet sind, um Rahmen zu senden, die ein OFDMmoduliertes Symbol (S) mit einem Schutzintervall (GI) bilden, das einem Teil zwischen einem Viertel und einem Achtel inklusive der Dauer der Übertragung eines OFDM-Symbols entspricht, wobei die Größe der Zellen (20) vor allem in Abhängigkeit von dem Schutzintervall (GI), von einer Sendeleistung, von einem für Mehrwege der gesendeten Rahmen repräsentativen Umfeldkriterium und von einem Abstand, der einer Schwelle des Auftretens von Interferenzen entspricht, bestimmt wird.
EP08290317A 2007-04-03 2008-04-01 Verfahren, das eine Mobil-TV-Ausstrahlung mit derselben Frequenz ermöglicht, bei der die Interferenzen bei Normalfernseh-Empfängern minimiert wird Active EP1993222B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0702435A FR2914809B1 (fr) 2007-04-03 2007-04-03 Procede permettant une diffusion de tv mobile avec une meme frequence et minimisant les interferences sur des recepteurs de tv fixe

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EP1993222A2 EP1993222A2 (de) 2008-11-19
EP1993222A3 EP1993222A3 (de) 2009-04-22
EP1993222B1 true EP1993222B1 (de) 2011-11-30

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EP08290317A Active EP1993222B1 (de) 2007-04-03 2008-04-01 Verfahren, das eine Mobil-TV-Ausstrahlung mit derselben Frequenz ermöglicht, bei der die Interferenzen bei Normalfernseh-Empfängern minimiert wird

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EP (1) EP1993222B1 (de)
AT (1) ATE536047T1 (de)
FR (1) FR2914809B1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5784683A (en) * 1995-05-16 1998-07-21 Bell Atlantic Network Services, Inc. Shared use video processing systems for distributing program signals from multiplexed digitized information signals
FR2890820B1 (fr) 2005-09-15 2008-04-04 Radiotelephone Sfr Procede d'etablissement d'une couverture permettant une telediffusion numerique par reutilisation d'une meme frequence

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Publication number Publication date
EP1993222A2 (de) 2008-11-19
EP1993222A3 (de) 2009-04-22
FR2914809A1 (fr) 2008-10-10
ATE536047T1 (de) 2011-12-15
FR2914809B1 (fr) 2009-05-22

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