WO2004086661A1 - Procede de transmission ofdm, emetteur et recepteur associes - Google Patents

Procede de transmission ofdm, emetteur et recepteur associes Download PDF

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Publication number
WO2004086661A1
WO2004086661A1 PCT/JP2003/003708 JP0303708W WO2004086661A1 WO 2004086661 A1 WO2004086661 A1 WO 2004086661A1 JP 0303708 W JP0303708 W JP 0303708W WO 2004086661 A1 WO2004086661 A1 WO 2004086661A1
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WO
WIPO (PCT)
Prior art keywords
service
slot
present
mobile reception
reception service
Prior art date
Application number
PCT/JP2003/003708
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English (en)
Japanese (ja)
Inventor
Albrecht Scheid
Akira Kisoda
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to PCT/JP2003/003708 priority Critical patent/WO2004086661A1/fr
Priority to AU2003236140A priority patent/AU2003236140A1/en
Publication of WO2004086661A1 publication Critical patent/WO2004086661A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals

Definitions

  • OFDM transmission method transmitting apparatus and receiving apparatus
  • the present invention relates to a method for transmitting, a method for receiving, a device for transmitting, and a device for receiving a data transmission format for portable reception compatible with the DVB-T system, which is digital broadcasting by an orthogonal frequency division multiplexing (OFDM) transmission system.
  • OFDM orthogonal frequency division multiplexing
  • DVB-T is known in Europe and ISDB-T in Japan.
  • the DVB-T system in Europe mainly targets fixed reception.
  • Test broadcasting and commercial services have been conducted in various countries, mainly in Europe, starting with commercial services in the UK in 1998. I have.
  • This OFDM modulation method is a type of multi-carrier modulation method.
  • transmission data is divided and assigned to a number of carriers that are orthogonal to each other with an effective symbol period length, and information is added to the amplitude and phase of each carrier using multilevel modulation such as QAM for each symbol. Generated by Fourier transform.
  • the OFDM signal uses a number of carriers, the symbol length can be increased. Therefore, a period during which a part of the signal is cyclically copied and transmitted, that is, a so-called guard period can be provided. Delayed waves within the guard period are removed when performing FFT processing on the receiving side, so that there is a characteristic that symbol interference does not occur.
  • S FN Single Frequency 'Network
  • DVB-T uses concatenated codes combining Reed-Solomon codes and convolutional codes for error correction.
  • Byte interleaving, bit interleaving, and frequency interleaving are used as interleaving.
  • Figure 24 shows DVB—T 2 shows channel coding of the first embodiment.
  • DVB-T there is also a hierarchical transmission format, and different streams can be allocated to the upper and lower bits of the mapping data.
  • This hierarchical transmission is called hierarchical transmission by mapping.
  • the upper bits are called high-priority (HP) data, and the lower bits are called low-priority data (LP) data.
  • Energy spread 11 for each HP data and LP data, read-solomon encoding 12, byte interleave 13 And the processing of convolutional coding 14 are performed. After that, bit interleaving 15 is performed for each bit, and after performing hierarchical synthesis, processing of frequency interleaving 20 and matching block 18 is performed, and after TPS signal 23 and the like are inserted, OFDM modulation 17 is performed.
  • DVB-T is available in 2k mode and 8k mode, and the number of carriers is 1705 (internal data carrier 15 1 2) and 68 17 (internal data carrier 6 0 4 8), respectively. It is. Frequency interleaving is performed over this effective carrier.
  • the ISDB-T system is designed so that not only Reed-Solomon codes and convolutional codes, but also frequency interleaving can be divided into 13 bands and the center segment can be independently interleaved. ing.
  • the specification allows interleaving in the time axis direction.
  • the ISDB-T system it is possible to extract and receive only the central segment.
  • the clock speed at the time of reception processing can be reduced as compared with the case where all 13 segments are received, and as a result, operation can be performed with low power consumption.
  • the DVB-T system is frequency-interleaved over the entire band, it is difficult to extract a part of the band, as in the ISDB-T system. For this reason, it is conceivable to transmit the necessary data on the mobile terminal only at a specific time in the symbol time direction, instead of dividing the band. In this way, it is only necessary to receive the data transmitted at a specific time, and low power consumption can be achieved.
  • data for normal fixed reception is broadcast. As a result, the data for mobile terminals and the data for fixed reception are mixed by byte interleaving, and the reception process becomes complicated.
  • the data is necessarily transmitted in the same modulation system.
  • fixed receiving terminals require large screens and high image quality, so high transmission rates such as 64QAM and modulation methods are used, whereas mobile receiving terminals have a small monitor, and the size of QVGA, CIF, QCIF, etc.
  • An image compressed by MPEG4 or the like may be transmitted, and the transmission rate is about 250 kbps to 600 kbps.
  • the fixed receiving terminal receives the signal using the rooftop antenna, so that it can receive signals without any problem even if the modulation method is 64 QAM.However, the mobile terminal uses a simple antenna and its installation height is low. It will be difficult.
  • the present invention relates to a transmission format for transmitting data for portable reception without affecting a conventional receiver for DVBT.
  • the present invention proposes a new transmission path coding in addition to the conventional transmission path coding, especially in a higher hierarchy.
  • the present invention utilizes the DVB-T hierarchical transmission and adds the concept of TDM to it.
  • An OFDM transmission method is an orthogonal frequency division multiplex signal having a frame structure composed of a fixed number of symbols, wherein the orthogonal frequency division multiplex signal Consists of upper and lower bits, the upper and lower bits are subjected to independent error correction coding, and the upper and lower bits are combined to form a carrier symbol, and the carrier symbol is
  • This is a digital broadcasting system that is hierarchized by mapping.
  • the upper bits are divided into slots in units of several symbols, and error-correction coding is applied to each of the divided slots before transmission.
  • the orthogonal frequency division multiplexed signal having a frame structure composed of a fixed number of symbols, wherein the orthogonal frequency division multiplexed signal is divided into slots of several symbols by TDM, It is characterized in that error correction coding is performed for each slot and transmitted.
  • the transmission device used in the transmission method of transmitting in units of slots by the TDM of the present invention includes a frame synchronization signal, a symbol synchronization signal, and an FFT sampling clock from an OFDM modulator. And a means for intensively arranging null packets before and after a specific slot period, and outputs a TS by dividing it into a plurality of sections.
  • the receiver that receives the radio wave transmitted by the transmission method of the present invention establishes initial synchronization, stores a predetermined TPS signal in a memory, and then selects a specific service from among the services transmitted in the slot. Only the service is selected, and the processing after the FFT is performed only for the specified slot period and only during the required slot from 3 symbols before the required slot.
  • transmission parameters are transmitted by using TPS signals of different OFDM frames for each mobile reception service.
  • FIG. 1 is a block diagram showing an embodiment of a digital broadcast transmitting method according to the present invention.
  • FIG. 2 is a diagram showing a slot configuration used in one embodiment of the present invention.
  • FIG. 3 is a diagram showing combinations of upper two bits (QPSK) parameters used in an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a time interval used in one embodiment of the present invention.
  • FIG. 5 is a diagram illustrating bit interleaving used in DVB-T.
  • FIG. 6 is a diagram showing an example of allocating broadcast services transmitted by the digital broadcast transmission method of the present invention to slots.
  • FIG. 7 is a block diagram showing an embodiment of a digital broadcast transmitting method according to the present invention.
  • FIG. 8 is a diagram showing a slot configuration used in one embodiment of the present invention.
  • FIG. 9 is a block diagram showing an embodiment of a digital broadcast transmitting method according to the present invention.
  • FIG. 1 ⁇ is a diagram showing a method of using slots used in an embodiment of the present invention.
  • FIG. 11 is a diagram showing a convolutional interleave used in an embodiment of the present invention.
  • FIG. 12 is a diagram showing a DVB packet transmission method used in one embodiment of the present invention.
  • FIG. 13 is a diagram showing a slot configuration of an embodiment of the digital broadcast transmitting method according to the present invention.
  • FIG. 14 is a diagram showing a combination of 16 QAM parameters used in an embodiment of the present invention.
  • FIG. 15 is a diagram showing the arrangement of TPS.
  • FIG. 16 is a diagram showing a slot use position in one embodiment of the digital broadcast transmission method of the present invention.
  • FIG. 17 is a block diagram showing an embodiment of a digital broadcast transmission method according to the present invention.
  • FIG. 18 is a diagram showing a slot configuration of a digital broadcast transmission method according to an embodiment of the present invention.
  • FIG. 19 is a diagram showing a combination of 64 QAM parameters used in an embodiment of the present invention.
  • FIG. 20 is a block diagram showing an embodiment of a digital broadcast transmission method according to the present invention. It is.
  • FIG. 21 is a diagram illustrating a method for controlling the TS multiplexer of the present invention.
  • FIG. 22 is a configuration diagram of a receiver that receives a signal transmitted according to the present invention.
  • FIG. 23 is a diagram illustrating an example of the SP signal included in the OFDM signal of the present invention.
  • FIG. 24 is a block diagram showing transmission of conventional DVB-T.
  • FIG. 25 is a flowchart illustrating the signaling method of the present invention.
  • FIG. 26 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 27 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 28 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 29 is a diagram showing services transmitted in one embodiment of the present invention.
  • FIG. 30 is a diagram showing a service transmitted according to an embodiment of the present invention.
  • FIG. 31 is a diagram showing services transmitted in one embodiment of the present invention.
  • FIG. 32 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 33 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 34 is a diagram showing services transmitted in one embodiment of the present invention.
  • FIG. 35 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 36 is a diagram illustrating signaling used in one embodiment of the present invention.
  • FIG. 1 is a first embodiment according to the present invention, and focuses on a higher layer among layer transmissions not used in DVB-T, and shows a channel coding scheme thereof.
  • the OFDM superframe of the higher layer 1 is divided into slots every several symbols in the time axis direction.
  • the length of each divided slot shall be set equal, and the division method shall be devised so that the number of transport streams (hereinafter TS) in the divided slots is an integral number.
  • Figure 3 shows the division taking into account the modulation method and convolutional coding. For each of the divided units, energy spreading 11, Reed-Solomon coding 12, byte interleaving 13, convolutional coding 14, and time interval 16 are applied.
  • FIG. 2 shows a superframe structure of the higher layer 1 according to the present embodiment.
  • the upper layer consists of 2 bits
  • the lower layer consists of 2 bits and 4 bits, depending on whether the mapping is 16 QAM or 64 QAM.
  • the present embodiment is an example of a 2k mode and a guard interval of 1/4.
  • hierarchical transmission is performed using 64 QAM as the mapping. Assuming that the code rate is 23, an integer number of packets can be stored in 17 symbols for the high-order 2 bits. Since 17 symbolonores are equivalent to lZl6 superframes, one superframe consists of 16 slots. The lower 4 bits are used to transmit fixed reception services, and use the same channel coding as DVB-T.
  • MUX 19 switches high-layer transmission data from a slot to the next slot.
  • the time-interleaved data is combined into one by the MUX 19, combined with the lower layer 2 after the bit interleaving 15 and converted into carrier symbols by the bit combining 21 and then into the frequency interleaving 20. Is output.
  • the processing of the mapping block 18 is performed, the OFDM modulation 17 is performed, and the result is output.
  • a different mobile reception service is transmitted for each slot.
  • the frequency of transmission is once per superframe for each service.
  • the frequency of transmitting the mobile reception service may be set to N (N is an integer) once in a superframe or M in N superframes (M is an integer).
  • FIG. 4 shows the time interleaving used in the present embodiment.
  • time interleaving defined by (i * 5) mod (1 2 6) is used.
  • convolution is performed in the direction of the symphony for each carrier.
  • a of (i * B) mod (A) may be a divisor of the number of data carriers 1 5 1 2
  • B is a prime number that is not a divisor of A. It is also possible to use something completely different from this, such as a table.
  • the time interval used in the present embodiment repeats the same pattern every 126 carriers.
  • the unit of bit interleaving and the unit of time interleaving can be aligned.
  • Figure 5 shows the bit interleave of DVB-T. As can be seen from Fig. 5, each bit is block interleaved using a block of 126 carriers as a unit.
  • the mobile receiver detects the TPS bit and detects the code rate and the like of the mobile reception service.
  • FIG. 6 shows a second embodiment according to the present invention.
  • the first two slots are used as one service in the first embodiment, and one service is assigned to each of the remaining fourteen slots. The rest is the same as the first embodiment.
  • energy spreading 11, Reed-Solomon encoding 12, byte interleaving 13, convolutional encoding 14, and time interval 16 are performed for each service.
  • the first two slots are combined for use in transmitting one service.
  • one service can be transmitted using a plurality of slots.
  • FIG. 7 shows a third embodiment according to the present invention, which is an example in which the time interleave is not used in the first embodiment, and the rest is the same as the first embodiment.
  • FIG. 8 shows Embodiment 4 according to the present invention, and is an example in Embodiment 1 in which one superframe is divided into eight slots.
  • the present invention can be applied to a combination in which an integer number of packets are used in 1/16 superframe and an integer number of packets are used in 1/8 superframe in FIG.
  • a 4 k mode and a guard interval 1 are used.
  • hierarchical transmission is performed using 64 QAM as mapping.
  • the 4K mode is not specified in DVB-T, the present invention is applicable to the 4k mode and will be described as an embodiment. In the 4k mode, it cannot be shared with the conventional DVB-T receiver.
  • the high-order 2 bits assuming a code rate of 1/2, an integer number of packets can be inserted in 34 symbols. Since 34 symbols are equivalent to 1/8 superframe, 1 superframe is composed of 8 slots.
  • the lower 4 bits are used to transmit fixed reception services, and use the same channel coding as DVB-T. Hereinafter, it is the same as the first embodiment.
  • FIG. 9 shows a fifth embodiment according to the present invention.
  • the hierarchical transmission of DVBT is considered as a two-sequence encoder having independent Reed-Solomon codes, byte interleaving, and convolutional codes.
  • the two streams input to MUX 22 are independent streams, and the mobile reception service and the fixed reception service are transmitted in a time-division manner.
  • the transmission of the mobile reception service has a slot structure as in the first embodiment. Each slot is bundled with MU X19.
  • the frequency of transmitting the mobile reception service is once per superframe.
  • the frequency of transmitting the mobile reception service may be set to once in N (N is an integer) superframe, or M times in N superframes (M is an integer).
  • time interleaving is introduced after the convolutional encoder for transmitting the mobile reception service, as in the first embodiment.
  • a 2 k mode and a guard interval of 1/4 are used as FFT, and QPSK: and a code rate of 23 are used for mobile reception services.
  • the service is transmitted using only one slot consisting of the 34 symbols at the beginning of the frame.
  • the fixed reception service uses 64 QAM and code rate 3Z4.
  • the conventional fixed reception service is that the TS packet input to the modulator is a null packet, and these are energy spreading 11 and Reed-Solomon coding 1, 2, byte interleaving 13, convolutional coding 14, time interleaving 16, bit interleaving 15, and frequency interleaving 20 are performed.
  • a bucket using a PID different from the fixed reception service may be processed.
  • Figure 10 illustrates this concept. Switching at the MUX 22 is performed in symbol units, so that frequency interleaving can be shared. Note that since the mapping is switched for each symbol, the configuration shown in Fig. 9 is sufficient. You may.
  • the MUX 22 switches to the mobile reception service by the position of the mobile reception service slot, that is, by 34 symbols. Therefore, the mapping of QPSK used for the mobile reception service is pure mapping, and the required receivable C / N can be reduced compared to the case where the higher bits are used as a mobile reception service by layering. .
  • the mobile receiver receives the slot in which the mobile reception service was transmitted and several symbols before it. Since slots are fixed and transmitted in the FDM super frame, reception processing is easy on the receiving side, and the switch only needs to be turned on for a certain period of time, and low power consumption can be expected. . In addition, since time interleaving is performed only between the slots of the mobile reception service, it is possible to extract and receive only the slot where the mobile reception service is transmitted.
  • the transmission rate of the mobile reception service transmitted in the present embodiment is 830 kbs.
  • null packets are input to the modulator from the TS multiplexer.
  • 24 null packets are further transmitted.
  • a total of 191 consecutive null data is input from the TS multiplexer to the fixed reception service modulator in synchronization with the superframe.
  • 178 packets are null packets from the beginning of the superframe
  • 13 packets are null packets from the end of the superframe.
  • the receiver will be described.
  • Conventional DVB-T receivers cannot distinguish between a fixed reception service and a portable reception service, so the transmitted signal is decoded as it is. Because the time interleaving 16 is applied to the section where the mobile reception service is transmitted, the conventional DVB-T receiver processes the packet as an error packet. However, the synchronization signal of the TS packet is also broken. However, subsequently, data that is correctly recognized as a null bucket 1 by the conventional receiver is also received, and the synchronization flag 47 can be identified, and the Reed-Solomon decoder performs error correction. After that, the position of B8 is detected, and the receiver performs the energy despreading correctly, and the actual transmitted data is restored. Note that the TS decoder may not be synchronized depending on the TS decoder provided after this. In that case, it is necessary to add an additional null bucket.
  • a 24-packet null packet for synchronization of the Reed-Solomon decoder is added to the 12 packets interleaved by byte interleaving after the slot for the form reception service. It is preferable to add a null packet after confirming the processing of the decoder.
  • TDM is introduced into DVB-T.
  • a total of 34 symbols from the 21st symbol at the beginning of the frame to 54 symbols are used by shifting the slot configuration by 20 symbols. That is, TPS 20 to TPS 53 are set in the mobile reception service slot.
  • Figure 13 shows the shifted slots.
  • Figure 15 shows the TPS information.
  • TPS is error-corrected by BCH
  • the TPS signal is modulated by BPSK.
  • the data for mobile reception uses 16QAM and a code rate of 2/3.
  • one superframe is destructed ij into eight slots, and one of them is transmitted, that is, 34 symbols are used for transmission.
  • Figure 14 shows the number of packets in one superframe for 16Q AM.
  • Figure 14 shows that a significant combination of parameters can be used even if the superframe is divided into eight slots.
  • the TS packet input to the modulator is a null packet, as shown in Fig. 9.
  • Energy spreading 11 Reed-Solomon coding 12
  • byte interleaving 13 convolutional coding 14
  • bit interleaving 15 frequency Number interleave 20 processes are performed.
  • a bucket using a PID different from the fixed reception service may be processed. This is as shown in Figure 10.
  • the fixed reception service of the present embodiment uses 16Q AM and a code rate of 2/3, similarly to the mobile reception service.
  • the number of packets transmitted in one superframe is 2,688.
  • FIG. 16 shows a seventh embodiment according to the present invention.
  • This embodiment is an example in which the transmission frequency of the mobile reception service is changed from one slot per frame to four slots per five frames, with five super frames as one unit. With this transmission, the slot positions appear alternately in odd and even frames. As described in Embodiment 7, the position of the slot is determined by the valid TPS signal. The issue is set to enter it.
  • the signal in the senor indicator 1 in FIG. 15 is signaled so that the cell is specified by combining the odd frame and the even frame, so that the transmission method of the present embodiment includes the cell indicator All TPS signals can be received in the slot of the mobile reception service.
  • FIG. 17 shows an eighth embodiment according to the present invention.
  • the present embodiment is an example in which the slot is applied to the fixed reception service as well as the mobile reception service in the fifth embodiment.
  • Fig. 18 shows the slot configuration of this embodiment
  • Fig. 19 shows the number of buckets for 64QAM.
  • This embodiment is not compatible with the conventional DVB-T service.
  • the mobile reception service of the present embodiment is compatible with the mobile reception service slot of the fifth embodiment.
  • one superframe is divided into eight slots, one of which is used for mobile reception service, and the remaining seven slots are used for fixed reception service.
  • the parameters used in this embodiment are 8 k mode, guard ratio 1 Z 4, QPSK code rate 1/2 for the portable slot, 64 4 QAM code rate 3/4 for the fixed slot, and 3/4 for the fixed slot. .
  • the encoder is a two-sequence encoder having independent energy spreading 11, Reed-Solomon encoding 12, byte interleaving 13, convolutional encoding 14, time interval 16, and bit interleaving 15. .
  • the mobile reception service and the fixed reception service introduce so-called TDM, switch on a symbol-by-symbol basis with the MU X 22 in a time-sharing manner, and after the frequency interval 20, the mapping block 18 Then, OFDM modulation 17 is performed and transmitted.
  • the mobile receiver receives only the slot in which the mobile reception service was transmitted. Since the slots are transmitted fixed in the OFDM superframe, the mobile receiver only needs to operate for a certain period of time, and low power consumption can be expected. In addition, since time interleaving 16 is performed independently in the mobile reception service slot and the fixed reception service slot, the time slot in which the mobile reception service is transmitted is provided. Reception is possible even if only the lot is taken out.
  • the transmission rate of the mobile reception service transmitted in the present embodiment is 623 kbps.
  • the transmission rate of the fixed reception service in the present embodiment is:
  • FIG. 20 shows a ninth embodiment according to the present invention.
  • the present embodiment is an example in which a service for mobile reception is used in a time-division manner in a DVB-T hierarchical service in one slot.
  • the service using the layered transmission of DVB-T is not currently performed. However, as shown in the present embodiment, even when the layered transmission of DVB-T is performed 1 /
  • a null packet is continuously input to the modulator input of the conventional hierarchical transmission of DVBIT and processed. You should leave it.
  • FIG. 21 shows the tenth embodiment.
  • a configuration method is described in which the transmitting side determines the packet arrangement according to the frame configuration.
  • the present embodiment relates to control of a TS multiplexer on the transmitting side when OFDM is applied to DVB-T according to the fifth and subsequent embodiments.
  • the FDM sampling clock and FFT size, guard ratio, superframe signal, symbol signal, modulation scheme for fixed reception and portable reception, coding rate, and slot size are transmitted from the OFDM modulator.
  • the number of slots and the presence / absence of slot shift are fed back to the transport stream MUX adaptation, and the mobile reception service is appropriately arranged at the position of the mobile reception slot.
  • mobile reception Null buckets are inserted and deleted for the service slot position and guards before and after the slot.
  • both the mobile service and the fixed reception service are used to import packets with PIDs that are not used by different receivers.
  • the re-execution of the PCR clock due to the packet movement is also performed in this block.
  • TS is divided according to the number of services, a null packet is inserted as necessary, and a TS packet is transmitted to the modulator. Further, the modulator receives the TS packet in each slot according to the number of services, and performs the transmission path coding described in the embodiment of the present invention.
  • the present embodiment relates to a receiver for a mobile reception service.
  • the mobile reception service can be received by a personal digital assistant (PDA), a mobile phone, or the like.
  • PDA personal digital assistant
  • This embodiment is an example of a portable receiver in the case where Embodiment 7 is received.
  • Figure 22 shows the processing of the receiver. After quadrature demodulation, the receiver performs clock synchronization, narrowband frequency synchronization, and symbol synchronization in the time domain. After FFT, wideband frequency synchronization, frame synchronization, and superframe synchronization are performed.
  • the mobile receiver establishes frame synchronization, symbol synchronization, and superframe synchronization at the start of reception of the mobile reception service, and receives the TPS signal. After storing the TPS signal in a predetermined memory, the minimum necessary circuits are operated so that symbol synchronization, frame synchronization, and superframe synchronization are not lost.
  • FIG. 23 shows the arrangement of the SP signals. Since the SP signal has the same arrangement every four symbols, from FIG. 23, it is necessary to extract the SP signal by performing FFT processing at least three symbols before a predetermined slot. Therefore, in the portable receiver, only the predetermined slot and the three symbols before it need to be processed after the FFT. Note that interleaving and error correction operate only in slots that include a predetermined service.
  • This embodiment is an example of a method of using a TPS signal.
  • This embodiment can be applied to the case of transmitting a mobile reception service using hierarchical transmission described in the first to fourth embodiments.
  • the TPS signal is repeatedly transmitted every frame, that is, every 68 symbols.
  • the frame number is incremented by the calculation of modu 1 o 4 for each OFDM frame. That is, the cycle of the frame number is one superframe.
  • bits s30, s31, and s32 of the hierarchically transmitted HP stream can be used for the mobile reception service sidanering.
  • the parameters are transmitted separately for each service of the HP stream.
  • the other bits are used for the current DVB-T service and cannot be used for mobile reception services. Even if the TPS is used for the mobile reception service, the DVB-T service transmitted in the LP stream of the same RF channel is not affected.
  • the related bits s30 to s32 of the entire HPP will be used for mobile reception services, and for each service of the HP layer (mobile reception services). Signaling other than the mobile reception service).
  • the OFDM superframe is divided into 4, 8, or 16 segments. There are 4, 8, and 16 slots respectively.
  • HP of layered transmission The mobile reception service transmitted by the stream is specified by the following parameters.
  • each index i it is specified whether or not the mobile reception service is being transmitted.
  • Figure 25 shows the signaling procedure of the mobile reception service.
  • Figure 26 shows the code rate of the mobile reception service
  • Figure 27 shows the start symbol position of the mobile reception service i
  • Figure 28 shows the time interval parameters of the mobile reception service.
  • the position of service 0 is not always fixed at the position of frame 0.
  • the transmission parameters of all services of the mobile reception service i can be transmitted.
  • the DVB-T service is transmitted in the LP layer, and the number of services N in the HP layer is six. Among them, it is assumed that services 0 to 4 are mobile reception services, and nothing is transmitted as service 5. That is, service 5 bridges the gap until the beginning of the next OFDM superframe. All services together make up one OFDM superframe.
  • Figure 29 shows an example of a specific service.
  • FIG. 30 shows an example of signaling this service by the method of the present embodiment. At the start of the HP service, the bit indicated in bold and italicized as 0000 indicates that service 0 is included. Subsequently, the data of services 1 and 2 are transmitted.
  • the total number of services is not signaled and transmitted. If the code rate bit is 101, it indicates that the service is not a mobile reception service. In that case, the time interval length has no meaning.
  • the receiver first monitors the TPS bit, which is used in common with DVB-T, and then the service 0 of the start of the HP service, that is, bits s48 to s51 are set to 0000. Search for a part. After that, the bits of the code rate and time interleave depth of the mobile reception service are stored for each service. Next, if 0000 appears in s48 to s51, it means that one service has been stored.
  • the mobile reception service is transmitted in synchronization with the symbol 0 of the frame 0 with one super frame as a cycle.
  • the mobile reception service sends out the mobile reception service with a period of several OFDM superframes instead of one superframe.
  • another signaling is possible using the current reserved bit.
  • the length of the mobile service is signaled using s48 to s51. According to this, the TPS signaling of the HP layer is formed over a number of superframes.
  • signaling with a value of s48 to s51 of 0000 is synchronized with OFDM frame 0 and used to indicate the start position of the mobile reception service 0.
  • the signaling data of the mobile reception service 0 is transmitted using the TPS signal of the OFDM frame 1, and the signaling data of the mobile service 1 is transmitted using the OFDM frame 2. The same applies hereinafter.
  • s48 to s51 of the TPS bit are padded with 0000.
  • 0000 always appears in frame 0 of 001 ⁇ .
  • FIG. 1 An example of actual signaling is shown in FIG. 1
  • 0000 shown in bold and italic pairs appearing in the OFDM frame 0 in the service length column indicates the start of the mobile reception service shidanarin group.
  • the signaling data of service 0 is transmitted using OFDM frame 1.
  • service 0 uses 8 slots.
  • services 1 to 4 are signaled using the TPS data of each OFDM frame.
  • 0000 is padded at the service length and continues until the next OFDM frame 0 appears. That is, when 0000 appears at the position of the next OFDM frame 0, the next signaling loop starts.
  • the number of transmitted services can be easily determined by counting the number of bits other than 0000 in the service length bits. In the case of this embodiment, the number of services is five.
  • the slot size is 17 symbols, that is, 1/16 OFDM superframe.
  • the present invention can be applied to a case where the slot length is 1Z8 or 1Z4 superframe.
  • Embodiments 5 to 9 can be applied to Embodiments 5 to 9.
  • no hierarchical information is required, and there is no need to consider empty slots or transmissions other than mobile reception services.
  • the necessary information may be as follows.
  • the mobile reception service mapping can be selected from QPSK, 16QAM, and 64QAM.
  • the constellation requires two bits, and s50 and s51 are used. If the mobile reception service continues for a long time, the DVB-T receiver will have a problem of insufficient RAM capacity of the MPEG decoder. Therefore, only a few slots need to be considered for the mobile reception service.
  • signaling is performed with a maximum of three slots. S48 and s49 are assigned as this slot size. In the case of the s48, s49 force S00, as in the thirteenth embodiment, it is used to indicate a service start position or for padding.
  • FIG. 34 shows a specific example of signaling in this embodiment.
  • 00 which is shown in bold italics in OFDM frame 0 in the service length column, indicates the start of the signaling loop of the mobile reception service. Subsequently, the signaling data of service 0 is transmitted using OFDM frame 1. In the case of the present embodiment, service 0 uses two slots. Further services
  • Signals 1 to 4 are signaled using the TPS data of each OFDM frame. Once the outgoing service is signaled, 00 is padded at the service length and continues until the next OFDM frame 0 appears. That is, when 00 appears at the position of the next OFDM frame 0, the next signaling loop starts. In this embodiment, there is no need to signal the number of services for mobile reception.
  • the number of services being transmitted can be easily determined by counting the number of bits other than 00 in the service length. In the case of this embodiment, the number of services is five.
  • s51 Modulation system for mobile reception service (QPSK, 16QAM)
  • s52 Code rate of mobile reception service (1/2 or 2/3)
  • s53 Reserved
  • the present embodiment also considers the case where the fixed reception service will be shifted to the slot-based service of the present invention in the future. That is, the case where the bit of s48 is 0 corresponds to the fifth embodiment, and the case where s48 is 1 corresponds to the eighth embodiment.
  • s49 indicates whether only one slot is used for the mobile reception service or all slots are individually used for the mobile reception service.
  • one service is composed of one slot.
  • the slot size, modulation method, and code rate are common to all mobile reception services even when used for all-slot mobile reception services. And each can only be selected from two parameters. However, considering actual operation, it is unlikely that the parameters will be changed for each slot, and mobile reception services are required to be robust against errors. It is considered that there is no practical problem in the signaling of the embodiment. According to the usage of this TPS, if the superframe division is set to 8 and the number of used slots is set to 4 in the mobile reception service, half of the time slot can be used for the mobile reception service.
  • This embodiment is applicable to the use of the TPS in the first to fourth embodiments.
  • Reserved bits of TPS are 6 bits from Fig.15. In this embodiment, the reserved bits are defined as shown in FIG.
  • s49 Code rate of mobile reception service (1 or 2/3).
  • the higher layer of the layer transmission by mapping since the higher layer of the layer transmission by mapping is used, the higher layer can transmit up to 16 services.
  • each portable reception service is made up of one slot, and the code rate of each service is common.
  • the present invention it is possible to introduce a mobile reception service while maintaining compatibility with DVB-T.
  • the conventional fixed reception service can be received by the conventional DVB-T receiver, and the introduced mobile reception service can be received by the mobile reception terminal.
  • the portable receiving terminal can also receive the fixed reception service.
  • the mobile reception service performs transmission path coding for each slot in which the service is transmitted
  • the portable reception terminal can receive the fixed reception service. It is also possible to take out only the service part and receive it, and the power consumption of the portable receiving terminal can be reduced.
  • a transmission method, a reception method, a transmission device, and a reception device capable of performing a mobile reception service in addition to a fixed reception service while having compatibility with DVB-T are provided. Can be provided.

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

Abstract

L'invention concerne un procédé de transmission de diffusion numérique qui permet de réaliser des économies d'énergie pour une pile destinée à une réception portable, et qui est compatible avec le procédé de diffusion terrestre numérique européen DVB-T. La supertrame du DVB-T est divisée en unités de plusieurs symboles de façon que chaque intervalle contienne un nombre entier de paquets TS. Un service est envoyé au moyen des intervalles définis par la division. Pour chaque service, l'étalement d'énergie, le codage Reed-Solomon, l'entrelacement des octets, le codage convolutionnel, et l'entrelacement temporel sont effectués. La compatibilité avec des récepteurs classiques est obtenue par envoi de paquets nuls avant et après l'intervalle au moyen duquel un service destiné à une réception portable est envoyé, de façon à ne pas mélanger le service destiné à un récepteur classique et le service portable. Les récepteurs classiques traitent le paquet TS destiné à un service portable en tant que paquet d'erreur, ce qui permet d'éviter tout problème de réception.
PCT/JP2003/003708 2003-03-26 2003-03-26 Procede de transmission ofdm, emetteur et recepteur associes WO2004086661A1 (fr)

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PCT/JP2003/003708 WO2004086661A1 (fr) 2003-03-26 2003-03-26 Procede de transmission ofdm, emetteur et recepteur associes
AU2003236140A AU2003236140A1 (en) 2003-03-26 2003-03-26 Ofdm transmitting method, transmitter, and receiver

Applications Claiming Priority (1)

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PCT/JP2003/003708 WO2004086661A1 (fr) 2003-03-26 2003-03-26 Procede de transmission ofdm, emetteur et recepteur associes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105763888A (zh) * 2013-05-09 2016-07-13 蔡留凤 可提高电视节目分辨率的超高清数字电视信号发射机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03104335A (ja) * 1989-09-19 1991-05-01 Nippon Telegr & Teleph Corp <Ntt> 信号伝送方式
JPH10322388A (ja) * 1997-05-16 1998-12-04 Nippon Hoso Kyokai <Nhk> デジタル信号伝送方法、およびデジタル信号伝送装置
JP2001339657A (ja) * 2000-05-26 2001-12-07 Sanyo Electric Co Ltd デジタル放送受信装置
JP2002217861A (ja) * 2001-01-15 2002-08-02 Sanyo Electric Co Ltd デジタル信号受信装置
JP2003146586A (ja) * 2001-11-05 2003-05-21 Tadano Ltd ジブ駆動制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03104335A (ja) * 1989-09-19 1991-05-01 Nippon Telegr & Teleph Corp <Ntt> 信号伝送方式
JPH10322388A (ja) * 1997-05-16 1998-12-04 Nippon Hoso Kyokai <Nhk> デジタル信号伝送方法、およびデジタル信号伝送装置
JP2001339657A (ja) * 2000-05-26 2001-12-07 Sanyo Electric Co Ltd デジタル放送受信装置
JP2002217861A (ja) * 2001-01-15 2002-08-02 Sanyo Electric Co Ltd デジタル信号受信装置
JP2003146586A (ja) * 2001-11-05 2003-05-21 Tadano Ltd ジブ駆動制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105763888A (zh) * 2013-05-09 2016-07-13 蔡留凤 可提高电视节目分辨率的超高清数字电视信号发射机

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