EP3343818A1 - Reduzierung von desynchronisierungseffekten in tdm-signalen einschliesslich dvb-t2-rahmen - Google Patents

Reduzierung von desynchronisierungseffekten in tdm-signalen einschliesslich dvb-t2-rahmen Download PDF

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Publication number
EP3343818A1
EP3343818A1 EP16306858.8A EP16306858A EP3343818A1 EP 3343818 A1 EP3343818 A1 EP 3343818A1 EP 16306858 A EP16306858 A EP 16306858A EP 3343818 A1 EP3343818 A1 EP 3343818A1
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Prior art keywords
dvb
level
data
succession
signal
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English (en)
French (fr)
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Stefan ILSEN
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Telediffusion de France ets Public de Diffusion
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Telediffusion de France ets Public de Diffusion
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Priority to EP16306858.8A priority Critical patent/EP3343818A1/de
Priority to EP17305399.2A priority patent/EP3343808A1/de
Priority to PCT/EP2017/084817 priority patent/WO2018122378A1/en
Publication of EP3343818A1 publication Critical patent/EP3343818A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/38—Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
    • 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
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
    • 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
    • H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
    • H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
    • H04H60/90—Wireless transmission systems
    • H04H60/91—Mobile communication networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/42—Arrangements for resource management
    • H04H20/423—Transmitter side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/30—Aspects of broadcast communication characterised by the use of a return channel, e.g. for collecting users' opinions, for returning broadcast space/time information or for requesting data
    • H04H2201/37—Aspects of broadcast communication characterised by the use of a return channel, e.g. for collecting users' opinions, for returning broadcast space/time information or for requesting data via a different channel

Definitions

  • the present invention generally relates to time division multiplexing (TDM) when multiplexing wireless signals of different protocols, including DVB-T2 protocol.
  • TDM time division multiplexing
  • Such non DVB-T2 data can be communication data such as LTE data and more particularly LTE-Advance or "LTE-A+" data.
  • the invention finds a possible (but non limitative) application when the aforesaid communication data are transmitted through an existing broadcast network, so-called Tower Overlay over LTE-A+.
  • LTE-A+ refers to all wireless telecommunication standards which are extensions of the LTE eMBMS specifications and which support signal time division multiplexing with other standards.
  • Broadcasting an LTE-A+ signal in the context of Tower Overlay over LTE-A+ aims at relieving mobile networks from the increasing load caused by popular content by offloading this data to existing broadcast networks.
  • TOoL+ further supports a cooperative spectrum between DVB-T2 and LTE-A+. This is made possible by the fact that DVB-T2 provides super-frames including so-called "Future Extension Frame" (FEF), enabling time domain spectrum sharing with other wireless networks.
  • FEF Full Extension Frame
  • DVB-T2 receiver only decodes the regular DVB-T2 part of the signal and ignores the LTE-A+ part of the hybrid signal.
  • LTE-A+ receiver only decodes the regular LTE-A+ part of the signal included in the FEF and ignores the DVB-T2 part of the hybrid signal.
  • DVB-T2 receivers and even more LTE-A+ receivers tend to desynchronize. Indeed, receivers while ignoring the other part of the hybrid signal do not receive any synchronization elements. For instance, the receivers cannot track decoding parameters like the OFDM window offset or frequency and sampling rate mismatches, typically.
  • LTE-A+ receivers require perfect synchronization to the LTE-A+ signal
  • DVB-T2 receivers require perfect synchronization to the DVB-T2 signal, otherwise the decoding quality can be impaired which presents itself as an signal to noise ratio (SNR) loss, which may lead to loss of data, possible retransmissions and a reduction of the Quality of Service.
  • SNR signal to noise ratio
  • DVB-T2/LTE-A+ frame durations are typically within the range of 70 to 210 milliseconds.
  • This problem does not only concern time division multiplexing of DVB-T2 and LTE-A+ signals, but time division multiplexing of signals from other wireless communication standards, on the condition that the two standards have at least a common frequency range.
  • the present invention aims to improve the situation.
  • the invention relates to a method implemented by computer means for processing a signal including a succession of DVB-T2 super-frames, comprising at least:
  • the method comprises processing a beginning of at least one of said first and second parts to ensure signal transmission robustness above a second level for said beginning, the second level being higher than the first level.
  • the present invention enables thus ensuring higher signal transmission robustness at least at the beginning of at least one part including either DVB-T2 data or non-DVB-T2 data.
  • SNR signal to noise ratio
  • the receiver encompasses all types of terminals, for instance mobile phones for example LTE user equipment, vehicle communication systems and all kinds of connected devices and more generally all end systems.
  • the first and second levels are predetermined (for instance: calculated by the computer means or predetermined by the network operator).
  • the second level is fixed so that the signal transmission robustness which is set up above this second level and applied to the signal at the beginning, at least reduces the decoding error due to de-synchronization of the receiver which is possibly at its maximum at the beginning.
  • the second level (L2) may be a multiple of the first level (L1).
  • the second level can be two times higher than the first level.
  • the second level can be determined as an increasing function of the duration of the part preceding the part on which is applied the signal transmission robustness above the second level. This embodiment is particularly relevant since the de-synchronization of the receiver is partially related to the duration of the parts that are ignored, and that these parts are not always of equal duration.
  • the level L2 may be set up during the beginning, as a decreasing function of the time. Indeed, since the synchronization of the receiver improves during the beginning it may be relevant to decrease the level of the signal transmission robustness consequently to keep a good ratio data rate/decoding error. That is to say to enhance the data rate while not significantly increasing the amount of decoding error due to the improvement of synchronization of the receiver.
  • the first and second levels are defined according to information relative to the quality of the transmission, this information being returned by at least one receiver of non-DVB-T2 data.
  • information can be for example a Channel Quality Indicator (CQI) or equivalent information, returned by at least one receiver of non-DVB-T2 data.
  • CQI Channel Quality Indicator
  • the first level L1 can be dynamically defined according to the CQI estimated for one or several previous non DVB-T2 data parts.
  • the second level L2 can be imposed to be N times (twice or more for example) a value defined for the first level L1 determined on the basis of the CQI.
  • the value of N can be fixed and stored along with an instruction of a computer program in a memory of the transmitter (and of the received as well as presented below).
  • the second level L2 can depend as well on the CQI estimated for a beginning of a previous non DVB-T2 data part.
  • the non-DVB-T2 communication standard may need to offer a non-broadcast mode, or the receiver may need to offer another wireless communication standard offering a non-broadcast mode.
  • the second level may be calculated indeed from a CQI or equivalent information, which refers to the quality of the transmission of at least one beginning of non-DVB-T2 data parts.
  • the second level may be set up in accordance with the CQI based on the quality of the transmission of the beginning of the previous latest non-DVB-T2 part.
  • the level of signal transmission robustness applied at a certain time of a non-DVB-T2 part may be determined according to the information on the quality of the transmission referring to a previous non-DVB-T2 part.
  • the second level L2 can be determined on the basis of CQI estimation in the beginning of that latest previous non-DVB-T2 part
  • the first level L1 can be determined on the basis of CQI estimation on the remaining portion of that latest previous non-DVB-T2 part.
  • the first L1 and second L2 levels can be determined, one (L2) according to the other (L1), or separately (L2 being independent from L1), on the basis of the CQI (or an equivalent information).
  • the duration of the beginning of non-DVB-T2 parts where the second level of robustness is applied can be also determined dynamically according to the CQI (or equivalent information).
  • Such embodiments enable to adapt the robustness according to the local circumstances to provide a better ratio data rate/decoding error.
  • the predetermined definition enables to avoid the need of the returns - stated above - from the receivers.
  • the non DVB-T2 data further comprises communication data, and more particularly LTE-Advanced type data, such as LTE-A+ type data.
  • Such embodiments enable to transmit data of such communication standard within the Future Extension Frame (FEF) of DVB-T2 super-frame, that is in a time division multiplex with DVB-T2 data.
  • the communication standard can be any wireless communication standard, which supports signal time division multiplexing, and which share common frequency range with DVB-T2.
  • the invention may be particularly relevant in the case of LTE-A or LTE-A+ in broadcast mode such as eMBMS or other standard used in broadcast mode because they do not usually permit Automatic Repeat reQuest or at least it offers a new degree of freedom in this case for the trade-off between wasting transmission resources and having too many retransmissions. Therefore it is important to be able to parameterize transmitters and receivers to have relatively few decoding errors. Yet, decoding errors are directly impacted by de-synchronization of the receiver, which is offset by or at least reduced by the present invention.
  • At least one of first and second parts comprises a succession of sub-frames, and the beginning comprises, at the most, one sub-frame which is the first sub-frame of the succession of sub-frames.
  • the first part comprises a succession of N T2-Frames, and the beginning comprises, at the most, n T2-Frames of said succession of N T2-Frames, with n ⁇ N.
  • the first sub-frame of the succession of sub-frames comprises a succession of slots, and wherein the beginning comprises, at the most, one slot which is the first slot in said succession of slots.
  • the first slot of said succession of slots comprises a succession of N symbols, and wherein said beginning comprises, at the most, n first symbols of said succession of N symbols, with n ⁇ N.
  • the duration of the beginning can therefore be set up at different lengths.
  • a short duration for instance one symbol allows to have a good data rate.
  • a long duration for instance one sub-frame or T2-Frames or more ensures that the receiver is well synchronized when the beginning is finished, avoiding too much decoding error due to de-synchronization.
  • the duration of the beginning is optimally set up for the time required for the receiver to fully synchronize.
  • time periods can be predetermined by the network operator, for example by operating tests or simply postulating their durations. Alternately, these time periods can be dynamically defined, for example: the receivers can send a Channel Quality Indicator (CQI), which enables to adapt these time periods according to the local circumstances and/or to the delay of synchronization.
  • CQI Channel Quality Indicator
  • the duration of the beginning can be determined as an increasing function of the duration of the part preceding the part on which is applied the signal transmission robustness above the second level. This embodiment is particularly relevant since the de-synchronization of the receiver is partially related to the duration of the parts that it ignored, and that these parts are not always of equal duration.
  • the signal transmission robustness is set above the second level during all the beginning time period.
  • the signal transmission robustness can be set above the second level and be gradually reduced during the beginning time period while the receiver synchronizes, this allows to opt for a good ratio data rate/decoding error.
  • L1, L2 and L3, L3 can be fixed independently from the two other levels by the network operator, for a first portion of the part, which was mentioned as the beginning.
  • L2 can be defined according to L1, for instance as a multiple of L1, for a second portion of the part.
  • the implementation of a Forward Error Correction is performed and the level of signal transmission robustness of the signal may be a function of the chosen FEC code rate.
  • the signal transmission robustness can be set above the second level by setting a low code rate and the signal transmission robustness can be gradually reduced during the beginning time period by increasing progressively the code rate.
  • the code rate may as well be constant for all the beginning time period.
  • Such embodiments enable to ensure a signal transmission robustness above a certain level at the beginning of at least one part including either DVB-T2 data or non-DVB-T2 data, by changing the FEC code rate to a lower code rate.
  • the Forward Error Correction applied can be a turbo code.
  • Turbo codes are particularly efficient among FECs, enabling a good ratio SNR/data rate.
  • the Forward Error Correction (FEC) applied can be a turbo code, to ensure a signal transmission robustness above a certain level at the beginning of at least one part including either DVB-T2 data or non-DVB-T2 data
  • the FEC applied can be a Low-density parity-check (LPDC) code.
  • LPDC Low-density parity-check
  • the implementation of a modulation scheme having a chosen number of bits per symbol is performed and the signal transmission robustness is enhanced when using a modulation scheme having fewer bits per symbol.
  • the signal transmission robustness can be set above the second level by setting a modulation scheme having few bits per symbol and then the signal transmission robustness can be gradually reduced during the beginning time period by applying several successive modulation schemes that progressively increase the bits per symbol, hereinafter referred to as a sequence of modulation schemes.
  • a single modulation scheme with the appropriate number of bits per symbol may as well be set up for all the beginning time period.
  • Such embodiments enable to ensure a signal transmission robustness above a certain level at the beginning of at least one part including either DVB-T2 data or non-DVB-T2 data, by changing the modulation scheme for a modulation scheme with fewer bits per symbol.
  • a second aspect of the invention concerns a transmitter configured to transmit a signal including a succession of DVB-T2 super-frames, comprising at least:
  • a third aspect of the invention concerns a receiver configured to receive a signal including a succession of DVB-T2 super-frames, comprising at least:
  • Such embodiments enable the receiver to acquire the level of signal transmission robustness applied to the signal and thereby to be able to extract the data included in the signal. For example when the signal transmission robustness set up above the second level is ensured through a code rate scheme of an implemented FEC scheme and a sequence of modulation schemes, the receiver which has received these parameters is able to demodulate and decode the signal properly to extract the data.
  • a fourth aspect of the invention concerns a computer program comprising code instructions to implement the method according to any one of the embodiments of the invention.
  • FIG. 1 there is shown a Tower Overlay over LTE-A+ system which comprises a High Tower, High power (HTHP) transmitter 1 covering many cellular towers 2.
  • HTHP High Power
  • the principle of Tower Overlay over LTE-A+ is to offload data transmitting through mobile networks, especially live video or popular content, to broadcast networks. Therefore the initial LTE-A+ data containing popular content is send through a HTHP transmitter 1 instead of a cellular tower.
  • the User Equipment (UE) 3 - LTE receiver - receives the data from the HTHP transmitter, like if it was sent by the cellular tower which covers the LTE cell in which the UE is.
  • This system enables to broadcast to all the UEs contained in many LTE cells covered by the HTHP transmitter, and therefore avoiding to distribute the popular content in many networks cells and possibly by several mobile network operators in parallel.
  • TOoL+ further supports a cooperative spectrum between DVB-T2 and LTE-A+, this is made possible by the fact that DVB-T2 provides super-frames including Future Extension Frames (FEF), enabling time domain spectrum sharing with other wireless networks.
  • FEF Future Extension Frames
  • LTE-A+ data is transmitted through a signal in time division multiplexing.
  • specific DVB-T2 receiver 4 only decodes the regular DVB-T2 part of the signal and ignores the LTE-A+ part of the hybrid signal
  • inversely specific LTE-A+ receiver 3 only decodes the regular LTE-A+ part of the signal included in the FEF and ignore the DVB-T2 part of the hybrid signal.
  • the LTE cellular towers 2 can as well be any cellular tower, and the communication standard can be any other wireless communication standard, which supports signal time division multiplexing, and which share common frequency range with DVB-T2.
  • the invention can be applied with LTE and LTE Advanced instead of LTE-A+.
  • the receiver of DVB-T2 or non-DVB-T2 standard comprises one receiver (RECE) 5, a demodulator (DEMO) 6, a FEC decoder (DECO) 7 and a memory unit (MEMO) 8 which are all control by a processor (PROC) 9.
  • the MEMO comprises a non-volatile unit which retrieves the computer program and a volatile unit which retrieves the signal transmission robustness scheme and/or a code rate scheme of the implemented FEC scheme and a sequence of modulation schemes.
  • P1, P2, P3, and P4 including alternatively DVB-T2 data and non-DVB-T2 data.
  • P1 includes DVB-T2 data
  • P2 includes non-DVB-T2 data
  • P3 includes DVB-T2 data
  • P4 includes non DVB-T2 data.
  • P1 includes non-DVB-T2 data
  • P2 includes DVB-T2 data
  • P3 includes non-DVB-T2 data
  • P4 includes DVB-T2 data.
  • the DVB-T2 standard enables to set the size and the structure of the super-frames, thus a super-frame can include several Future Extension Frames (FEF).
  • FEF Future Extension Frames
  • Each part can include one or several frames of a DVB-T2 super-frame or even several frames from several super-frames in a row.
  • the part including non-DVB-T2 data lasts until a DVB-T2 frame is transmitted, reciprocally the part including DVB-T2 data lasts until a FEF frame including non-DVB-T2 data is transmitted.
  • time period of each part is not defined in advance and so P1 and P3 or P2 and P4 can have a different time period.
  • the data included in the FEF can be from any wireless communication standard, which supports signal time division multiplexing, and which share common frequency range with DVB-T2. Since, LTE-A+ share common frequency range with DVB-T2, LTE-A+ signal can be time division multiplexed with a DVB-T2 signal, same can be done with LTE and LTE Advance.
  • FIG. 2B there is shown schematically the evolution of the synchronization of the receiver (R2) towards the signal transmitting P2 and P4.
  • R2 is the non-DVB-T2 data receiver but R2 can indifferently be the DVB-T2 data receiver or the non-DVB-T2 data receiver.
  • non-DVB-T2 can be any wireless communication standard which support signal time division multiplexing, and which share common frequency range with DVB-T2.
  • non-DVB-T2 can be as well LTE, LTE-A or LTE-A+.
  • signal transmission robustness is set up above a predetermined level, L2, during the beginning of T 2 and T 4 .
  • the level is selected to avoid or to reduce decoding error due to the de-synchronizations.
  • the level L2 may be predetermined calculated by computer means or set by the network operator. For example it is possible to perform tests on specific receivers to set up a level that is not too high, to keep a good data rate. Indeed, generally enhancing robustness involves reducing the data rate.
  • the level L2 may be a multiple of the first level, L1.
  • the L2 can be two times higher than L1.
  • the level L2 can be determined independently for each beginning of T 2 and T 4 as a function of the duration of the precedent time periods T 1 and T 3 . For example if L2 is set up at a X + L1 level for a duration of the precedent period of t 1 , L2 may be set up at a 2X + L1 level for a duration of the precedent period of 2 times t 1 . This embodiment is particularly relevant since the de-synchronization of the receiver is partially related to the duration of the parts that it ignored, and that these parts are not always of equal duration.
  • the receivers can send a Channel Quality Indicator (CQI) through the cellular tower (2), which enables to adapt the robustness according to the local circumstances and/or to the level of de-synchronization to provide a better ratio data rate/decoding error.
  • CQI Channel Quality Indicator
  • the level, L2 is higher than the level, L1, of signal transmission robustness set up for the rest of T 2 and T 4 that occurs when R2 is synchronized.
  • a data rate level can be considered to estimate a level of robustness.
  • the robustness scale can be defined also by determining levels and by mapping for each level a given couple of a modulation scheme and FEC code rate.
  • T 2 ' and T 4 ' considered as the beginning of T 2 and T 4 optimally lasts the time required for R2 to fully resynchronize.
  • time periods can be predetermined by the network operator, for example by operating tests or simply postulating their durations. Alternately, these time periods can be dynamically defined, for example: the receivers can send a Channel Quality Indicator (CQI) through the cellular tower (2), which enables to adapt these time periods according to the local circumstances and/or to the delay of synchronization.
  • CQI Channel Quality Indicator
  • T 2 ' and T 4 ' can be determined independently as a function of the duration of the precedent time periods T 1 and T 3 . For example if T 2 ' is set up at t 2 ' for a duration of the precedent period of t 1 , T 4 ' may be set up at a duration of 2 times t 2 '.
  • T 2 ' and T 4 ' can be defined as, at the most, the first sub-frame in the succession of sub-frames.
  • T 2 ' and T 4 ' can be defined as, at the most, the first one slot in the succession of slots.
  • T 2 ' and T 4 ' can be defined as, at the most, the first n symbols in the succession of N symbols, with n ⁇ N.
  • the effective signal transmission robustness scheme to apply is set up and transmitted to R2 which registers it in the MEMO.
  • the effective signal transmission robustness is at least above L2 and during at least T 2 ' and T 4 '. It may be relevant to set up the effective signal transmission robustness as a decreasing function of the time, during T 2 ' and T 4 '. Indeed, since the synchronization of the receiver improves during T 2 ' and T 4 ' it may be relevant to decrease the level of the signal transmission robustness consequently to keep a good ratio data rate/decoding error. That is to say to enhance the data rate while not significantly increasing the amount of decoding error due to the enhancement of the synchronization of the receiver.
  • the transmitter is configured to enhance signal transmission robustness of the signal transmitting P2 and P4 according to the signal transmission robustness scheme.
  • Such enhancement of the signal transmission robustness can also be achieved by the implementation of a Forward Error Correction (FEC). Therefore redundant bits are added to the transmitted data.
  • the code rate stands for the proportion of non-added bits on the total amount of bits. The more bits are added, the more the signal transmission robustness may be enhanced, and the lower the code rate is. Thus, the signal transmission robustness is a decreasing function of the FEC code rate. Consequently, the code rate scheme of the implemented FEC is chosen according to the signal transmission robustness scheme.
  • the Forward Error Correction implemented can be a turbo code.
  • Turbo codes are particularly efficient among the FEC codes, enabling a good ratio SNR/data rate.
  • Such enhancement of the signal transmission robustness can also be achieved by the implementation of a modulation scheme having a chosen number of bits per symbol.
  • the signal transmission robustness may be enhanced when using a modulation scheme having fewer bits per symbol.
  • the signal transmission robustness may be reduced when using a modulation scheme having higher bits per symbol.
  • the effective signal transmission robustness scheme can be set up by combining several of solutions, for example using FEC codes rates combine with modulations schemes. Therefore, the code rate scheme of the implemented FEC and the sequence of modulation schemes are defined, according to the effective signal transmission robustness scheme.
  • non-DVB-T2 can be any wireless communication standard which support signal time division multiplexing and which share common frequency range with DVB-T2.
  • the invention may be especially relevant in the case of LTE, LTE-A or LTE-A+, since these wireless communication standard provides re-transmissions. Therefore, when used in a broadcast mode, for example eMBMS, it can be relevant to implement the invention rather than to rely on re-transmissions, which could reduce the data rate and increase the latency, reducing the quality of service.
  • the invention may also be relevant in the case of LTE, LTE-A or LTE-A+, when not used in broadcast mode.
  • DVB-T2 is a broadcast standard and therefore the HTHP is designed for transmitting and not receiving signals from the receivers, nonetheless while the downlink can be done between HTHP and the UE, the uplink can be done between the UE and the LTE cellular towers.
  • a non-broadcast mode the UE will send a Channel Quality Indicator (CQI) to the LTE base station.
  • CQI Channel Quality Indicator
  • the R2 At the end of the non-DVB-T2 data transmission time period for example P2, T 2 , the R2 will be fully synchronized and therefore will send a high CQI index.
  • T 4 At the beginning of the new non-DVB-T2 data transmission time period, T 4 , the signal transmission robustness will be weak, when the de-synchronization of the UE will be maximal. Thus the loss of data may be significant, whereas the invention would have avoided this problem.
  • the network operator or the computer means define the level L2 and the time periods considered as the beginning.
  • the network operator or the computer means set up the effective signal transmission robustness scheme to apply, which is at least above L2 and at least during the time period considered as the beginning. Therefore, a code rate scheme of the implemented FEC and a sequence of modulation schemes are defined. The same is done if other solutions are chosen to enhance the signal transmission robustness.
  • the FEC coder and the modulator concerned by the signal transmitting P2 and P4, that is to say either DVB-T2 or non-DVB-T2 modulator component from the hybrid modulator, are configured in consequence.
  • the signal transmission robustness scheme and/or the code rate scheme of the implemented FEC and the sequence of modulation schemes may be transmitted to the receiver R2 and then R2 registers it in the MEMO.
  • the FEC coder runs the code rate scheme on P2 and P4.
  • the modulator concerned by the signal transmitting P2 and P4 executes the modulation scheme according to the sequence of modulation schemes previously defined.
  • the modulator concerned by the signal transmitting P2 and P4 transmits the signal to the multiplexer/transmitter which emits the signal of either one or the other modulator in accordance with the super-frame structure.
  • the steps 21, 22 and 23 can be repeated as long as the transmitter emits a signal and that the signal transmission robustness scheme is not changed.
  • R2 receives the signal transmission robustness scheme and/or the code rate scheme of the implemented FEC and the sequence of modulation schemes, and R2 registers them in the MEMO.
  • R2 configures the demodulator and the FEC decoder according to the code rate scheme of the implemented FEC and the sequence of modulation schemes registered in the MEMO.
  • R2 receives the signal transmitting P1, P2, P3 and P4.
  • R2's demodulator demodulates the signal.
  • R2's FEC decoder decodes the succession of bits and extract the P2 and P4 data.
  • the steps 41, 42 and 43 can be repeated as long as the transmitter emits a signal and that the signal transmission robustness scheme is not changed.
  • the invention further applies to the case where the beginnings of each parts, the ones including DVB-T2 data, and the ones including non-DVB-T2 data, have their signal transmission robustness enhanced above the second level.
  • the invention further applies to the case where more than two levels above which the signal transmission robustness is ensured, are determined.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
EP16306858.8A 2016-12-30 2016-12-30 Reduzierung von desynchronisierungseffekten in tdm-signalen einschliesslich dvb-t2-rahmen Withdrawn EP3343818A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP16306858.8A EP3343818A1 (de) 2016-12-30 2016-12-30 Reduzierung von desynchronisierungseffekten in tdm-signalen einschliesslich dvb-t2-rahmen
EP17305399.2A EP3343808A1 (de) 2016-12-30 2017-04-03 Anpassung von rundfunkparametern auf grundlage von rückmeldungsdaten
PCT/EP2017/084817 WO2018122378A1 (en) 2016-12-30 2017-12-29 Reduction of de-synchronization effects in tdm signals including dvb-t2 frames

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16306858.8A EP3343818A1 (de) 2016-12-30 2016-12-30 Reduzierung von desynchronisierungseffekten in tdm-signalen einschliesslich dvb-t2-rahmen

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EP4087289A1 (de) * 2021-05-04 2022-11-09 Rohde & Schwarz GmbH & Co. KG Netzwerkverwalter und verfahren
EP4087288A1 (de) * 2021-05-04 2022-11-09 Rohde & Schwarz GmbH & Co. KG Basisstation und verfahren zum betrieb einer basisstation

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