JP2018101862A - Transmitter, transmission method, receiver, and reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of increasing the transmission capacity by implementing the same in combination with current service.SOLUTION: A transmitter 3000 transmits a multiple signal in which a first data series of a first hierarchy and a second data series of a second hierarchy are multiplexed, a first control signal generated from a first control information which represents a method used for transmission of the first data series, and a second control signal generated from a piece of second control information which represents a method used for transmission of the second data series. The first control information does not include any piece of information which represents the multiple signal is multiplexed with the second data series.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radio transmission technology.

  Japanese terrestrial television broadcasting ended in analog broadcasting in July 2011, and has been completely switched to digital broadcasting. In Japanese terrestrial television broadcasting, an HDTV service is performed using an ISDB-T (ISDB-Terrestrial) system as a transmission standard. The ISDB-T system employs an OFDM (Orthogonal Frequency Division Multiplexing) system (Non-Patent Document 1).

ARIB Standard ARIB STD-B31 Version 2.2 (March 2014): Transmission System for Digital Terrestrial Television Broadcasting “A Study on the Application of the LDM System to Terrestrial Digital TV Broadcasting”, Eijitsu Technical Report, Vol. 40, no. 35, pp. 1-4, (Oct. 2016)

  In general, a large capacity is required for wireless transmission. Therefore, the present disclosure provides a transmitting apparatus and a receiver capable of increasing the transmission capacity as compared with the current service without using other frequency bands when implemented in combination with the current service in wireless transmission. An object is to provide an apparatus, a transmission method, and a reception method.

  To achieve the above object, a transmission apparatus according to an aspect of the present disclosure superimposes a plurality of data sequences including a first data sequence of a first hierarchy and a second data sequence of a second hierarchy. A transmission apparatus for multiplexing and transmitting by encoding, wherein the first mapping generates a first modulation symbol sequence of the first data sequence by mapping a first bit sequence of the first data sequence A second mapping unit that generates a second modulation symbol sequence of the second data sequence by mapping a second bit sequence of the second data sequence, and the first modulation symbol sequence A superimposition unit that generates a multiplexed signal by superimposing the second modulation symbol sequence at a predetermined amplitude ratio, and first control information indicating a scheme used for transmission of the first data series, Control signal A control signal generating unit that generates a second control signal from second control information indicating a method used for transmission of the second data sequence, the multiplexed signal, the first control signal, and the second And the first control information does not include information indicating that the second data series is multiplexed on the multiplexed signal.

  According to the above transmission apparatus, when the wireless transmission is performed in combination with the current service, the transmission capacity can be increased as compared with the current service without using another frequency band.

3 is a diagram illustrating a configuration of a transmission device 3000 according to Embodiment 1. FIG. 3 is a diagram showing a configuration of a hierarchy processing unit 3041 in Embodiment 1. FIG. 6 is a diagram illustrating a part of the definition of a TMCC signal in Embodiment 1. FIG. 3 is a diagram showing a configuration of an existing ISDB-T receiving apparatus 3300 according to Embodiment 1. FIG. FIG. 10 is a diagram illustrating a configuration of a multi-tier TS reproduction unit 3331 in the first embodiment. 6 is a diagram illustrating a configuration of an FEC decoding unit 3333 according to Embodiment 1. FIG. FIG. 10 is a diagram illustrating a configuration of a reception device 3500 in the first embodiment. FIG. 25 is a diagram illustrating a configuration of an FEC decoding unit 3533 in the first embodiment. FIG. 10 is a diagram illustrating a configuration of a transmission device 3600 according to Embodiment 2. FIG. 10 is a diagram illustrating a configuration of a reception device 3800 in Embodiment 2. FIG. 10 is a diagram illustrating a configuration of a transmission device 4000 in the third embodiment. FIG. 10 is a diagram illustrating a configuration of a reception device 4600 according to Embodiment 3. FIG. 10 is a diagram illustrating a configuration of a transmission device 4100 according to a fourth embodiment. FIG. 20 is a diagram illustrating a configuration of a hierarchy processing unit 4141 in the fourth embodiment. 10 is a diagram showing a part of the definition of a TMCC signal in Embodiment 4. FIG. [Fig. 20] Fig. 20 is a diagram illustrating a configuration of a reception device 4700 in the fourth embodiment. FIG. 20 is a diagram illustrating a configuration of a transmission device 4200 in a fifth embodiment. It is a figure which shows the segment structure in Embodiment 5. FIG. FIG. 10 is a diagram illustrating a configuration of a receiving device 4800 in a fifth embodiment. FIG. 20 is a diagram illustrating a configuration of a transmission device 4400 according to Embodiment 6. FIG. 25 is a diagram showing an SP signal arrangement pattern when the selection signal is “1” in the sixth embodiment. FIG. 25 is a diagram illustrating a configuration of a reception device 4900 in the sixth embodiment. It is a figure which shows the structure of the transmission apparatus 5000 in an ISDB-T system. It is a figure which shows the structure of the hierarchy process part 5041 in an ISDB-T system. It is a figure which shows the structure of the frequency interleaving part 5071 in an ISDB-T system. It is a figure which shows the segment structure of an ISDB-T system.

  FIG. 23 is a diagram illustrating a configuration of a transmission device 5000 in the ISDB-T system. The transmission device 5000 includes a TS (Transport Stream) remultiplexing unit 5011, an RS (Reed-Solomon) encoding unit 5021, a layer division unit 5031, layer processing units 5041-A to C, a layer synthesis unit 5051, a time interleaving unit 5061, Frequency interleaving section 5071, pilot signal generation section 5081, TMCC (Transmission Multiplexing Configuration Control) / AC (Auxiliary Channel) signal generation section 5091, frame configuration section 5101, OFDM signal generation section 5111, D / A conversion section 5121, frequency conversion section 5131.

  Hereinafter, the operation of the transmission device 5000 will be described. A plurality of TSs output from an MPEG-2 multiplexing unit (not shown) are input to the TS remultiplexing unit 5011 in order to obtain a TS packet arrangement suitable for signal processing in units of data segments. The TS remultiplexing unit 5011 converts the signal into a burst signal format of 188 bytes and a single TS using a clock that is four times the FFT (Fast Fourier Transform) sample clock. The RS encoding unit 5021 performs RS encoding and adds 16-byte parity to 188-byte information. When performing hierarchical transmission, the hierarchical division unit 5031 performs hierarchical division of up to three systems (A hierarchy, B hierarchy, and C hierarchy) in accordance with the designation of hierarchy information.

  FIG. 24 is a diagram illustrating a configuration of the hierarchy processing unit 5041. The hierarchical processing unit 5041 includes an energy spreading unit 5201, a byte interleaving unit 5211, a convolutional coding unit 5221, a bit interleaving unit 5231, and a mapping unit 5241. The hierarchical processing unit 5041 mainly performs digital data processing such as error correction coding and interleaving, and carrier modulation on the input hierarchical data. Error correction, interleave length, and carrier modulation scheme are set independently in each layer.

  In FIG. 23, a layer composition unit 5051 performs layer composition of data of up to three systems (A layer, B layer, and C layer) output from the layer processing units 5041-A to 5041-C.

  FIG. 25 is a diagram illustrating a configuration of the frequency interleaving unit 5071. The frequency interleaving unit 5071 includes a segment dividing unit 5301, inter-segment interleaving units 5311-D and S, intra-segment carrier rotation units 5321-P and D and S, and intra-segment carrier randomizing units 5331-P and D and S. In order to effectively demonstrate the error correction coding capability against electric field fluctuations and multipath interference in mobile reception, the time interleaving unit 5061 performs convolutional interleaving within the segment on the output from the layer synthesis unit 5051, and the frequency An interleave unit 5071 performs interleaving between segments and within segments. In the frequency interleaving unit 5071, the segment dividing unit 5301 includes a partial receiving unit, a differential modulation unit (a segment in which carrier modulation is designated as DQPSK), and a synchronous modulation unit (a segment in which the carrier modulation is designated as QPSK, 16QAM, or 64QAM) Data segment numbers 0 to 12 are assigned in this order. As for the relationship between the hierarchical structure and the data segment, the data segments of each hierarchy are continuously arranged in the order of numbers, and the hierarchy including the smaller number of data segments is designated as the A hierarchy, the B hierarchy, and the C hierarchy. Even when the layers are different, inter-segment interleaving is performed on data segments belonging to the same type of modulation unit.

  In FIG. 23, a pilot signal generation unit 5081 generates a synchronous reproduction pilot signal. The TMCC / AC signal generation unit 5091 generates a TMCC signal that is control information and an AC signal that is additional information in order to assist demodulation and decoding of the reception apparatus for hierarchical transmission in which a plurality of transmission parameters are mixed. The frame configuration unit 5101 is an ISDB-T system based on information data output from the frequency interleaving unit 5071, a pilot signal for synchronous reproduction output from the pilot signal generation unit 5081, and a TMCC signal output from the TMCC / AC signal generation unit 5091. The transmission frame is configured.

  FIG. 26 shows a segment configuration of the ISDB-T system, taking as an example a synchronous modulation unit (QPSK, 16QAM, 64QAM) in mode 1 (FFT size is 2k). Instead of transmitting a distributed pilot signal (hereinafter referred to as an SP signal: Scattered Pilot signal) as a pilot signal for synchronous reproduction for each subcarrier, it is converted into a symbol of symbol number n in the frequency (subcarrier) direction and time (symbol) direction. On the other hand, transmission is performed at a carrier position where the carrier number k satisfies k = 3 (n mod 4) + 12p (mod represents a remainder operation and p is an integer). That is, as shown in FIG. 26, SP signals are repeatedly arranged with a period of 4 symbols, and shifted by 3 carriers for each symbol. The SP signal arranged in this way is modulated into a binary value with a specific pattern determined by the carrier position and transmitted. In addition, TMCC signal and AC signal carriers are randomly arranged in the frequency direction in order to reduce the influence of periodic dips on transmission path characteristics due to multipath. In the ISDB-T system, an information transmission signal is modulated using a modulation system such as QPSK, 16QAM, or 64QAM using a carrier on which an SP signal, a TMCC signal, and an AC signal are not arranged, and transmitted.

  In FIG. 23, the OFDM signal generation unit 5111 inserts IFFT (Inverse FFT) and GI (Guard Interval) into the ISDB-T transmission frame configuration output from the frame configuration unit 5101, and the ISDB-T method The digital baseband transmission signal is output. The D / A converter 5121 performs D / A conversion on the ISDB-T digital baseband transmission signal output from the OFDM signal generator 5111, and outputs an ISDB-T analog baseband transmission signal. . The frequency converter 5131 performs frequency conversion to the frequency channel Y on the ISDB-T analog baseband transmission signal output from the D / A converter 5121, and the ISDB-T analog RF transmission signal is not illustrated. Output from the transmitting antenna (Tx-1).

  By the way, in recent years, studies on UHDTV (Ultra HDTV) services exceeding the resolution of HDTV services have been actively conducted. In order to realize a UHDTV service with a high bit rate, it is important to study a transmission method that enables high-capacity transmission with higher frequency utilization efficiency than the ISDB-T method. As a technique for performing large-capacity transmission without using other frequency bands while continuing the current broadcasting service using the ISDB-T method, LDM (Layered Division Multiplexing) is applied to the current ISDB-T broadcasting service. ) A method of increasing the transmission capacity by applying the method has been studied (Non-Patent Document 2).

  In Non-Patent Document 2, a high signal level is assigned to the transmission RF signal of the current broadcast using the ISDB-T system, and a low signal level is assigned to the transmission RF signal (the same RF frequency as the ISDB-T system) of the new broadcast system. The former is called UL (Upper Level) and the latter is called LL (Lower Level). The transmission RF signals of UL and LL are added and output from the transmission antenna.

  The reception apparatus compatible with the new broadcasting system first decodes the UL data from the received RF signal, and reconstructs the RF reception signal when it is transmitted only by the UL using the estimated transmission path at that time. Then, by subtracting the reconstructed UL RF reception signal from the reception RF signal, the RF reception signal when only the LL is transmitted is taken out and the LL data is decoded.

  When receiving only the UL signal, since the LL signal can be regarded as noise, special processing such as reconstruction and subtraction described above is not necessary. Therefore, this also applies to existing receivers compatible with the current broadcast by the ISDB-T method.

  Non-Patent Document 2 examines the possibility of performing large-capacity transmission without using other frequency bands by continuing the current broadcasting by the ISDB-T method by using the application method of the LDM method.

  However, in such an application method of the LDM system, a system capable of accurately decoding a UL signal and an LL signal by a receiver compatible with the new broadcast system is constructed, and the system adversely affects an existing receiver compatible with the current broadcast. Must be excluded. Also, some years after the application method of the LDM system was put into practical use, the current broadcasting (UL signal) by the ISDB-T system was stopped and only the new broadcasting (LL signal) by the new broadcasting system was expected. It is necessary to build a method.

  The inventions according to the first to sixth embodiments, which will be described below, are made to solve the above-described problems, and are a transmission apparatus, a transmission method, a reception apparatus, and a reception apparatus that newly use the LDM scheme for current broadcasting. It is an object to provide a method, an integrated circuit, and a program.

  Hereinafter, each embodiment will be described in detail with reference to the drawings.

(Embodiment 1)
<Transmission device and transmission method>
FIG. 1 is a diagram showing a configuration of transmitting apparatus 3000 according to Embodiment 1 of the present invention. The same components as those of the conventional transmission apparatus are denoted by the same reference numerals, and description thereof is omitted.

  The transmission device 3000 shown in FIG. 1 has a configuration in which the hierarchical processing units 5041-A to 5041-A to C are replaced with hierarchical processing units 3041-A to C as compared with the conventional transmission device 5000 shown in FIG.

  Hereinafter, the operation of the transmission device 3000 will be described. A plurality of TSs for a new broadcasting system output from an MPEG-2 multiplexing unit (not shown) are input to the hierarchical processing units 3041-A to C as LL signals, respectively. On the other hand, a plurality of ISDB-T TSs are input to the TS remultiplexing unit 5011 as UL signals, and the TS remultiplexing unit 5011, the RS encoding unit 5021, and the layer division unit 5031 are connected to the conventional transmission device 5000 shown in FIG. Similar processing is performed.

  FIG. 2 is a diagram illustrating a configuration of the hierarchy processing unit 3041. Compared with the conventional hierarchical processing unit 5041 shown in FIG. 24, the energy spreading unit 3201, the BCH encoding unit 3211, the LDPC encoding unit 3221, the bit interleaving unit 3231, the mapping unit 3241, the power difference control unit 3251 and the adding unit 3261. And the power normalization part 3271 is added.

  When the UL signal is input from the hierarchical division unit 5031 in the hierarchical processing unit 3041 of FIG. 2, the energy spreading unit 5201, the byte interleaving unit 5211, the convolutional encoding unit 5221, the bit interleaving unit 5231, and the mapping unit 5241 are shown in FIG. The same processing as the conventional hierarchical processing unit 5041 shown in FIG.

  When the LL signal is input, the energy spreading unit 3201 collects data included in one or more TS packets, stores timing information in a header, and performs energy spreading processing only on the information bits as information bits. The BCH encoding unit 3211 performs BCH encoding, and the LDPC encoding unit 3221 performs LDPC encoding. In general, the bit interleaving unit 3231 performs bit interleaving different from the ISDB-T bit interleaving unit 5231 in FIG. 2 in order to extract the capability of LDPC encoding. The mapping unit 3241 applies, for example, NUQAM (Non-Uniform QAM) as carrier modulation in order to increase the capacity.

  Based on the LL signal power instruction signal, the power difference control unit 3251 lowers the power of the carrier modulation signal (LL) output from the mapping unit 3241 from the power of the carrier modulation signal (UL) output from the mapping unit 5241.

  The adding unit 3261 adds the carrier modulation signals (UL and LL) output from the mapping unit 5241 and the power difference control unit 3251.

  Based on the LL signal power instruction signal, the power normalization unit 3271 normalizes the power of the output signal of the addition unit 3261 so that the power is the same as the power of the carrier modulation signal (UL) output from the mapping unit 5241. .

  In the transmission apparatus 3000 of FIG. 1, the hierarchical composition unit 5051 and subsequent operations are the same as those of the conventional transmission apparatus 5000 shown in FIG. However, as will be described later with reference to FIG. 3 (part of the definition of the TMCC signal), in order to apply the LDM method performed by the hierarchical processing unit 3041 of FIG. .

  FIG. 3 shows a part of the definition of the TMCC signal. 3A and 3B show the definitions of B110 to B121 in the TMCC signal in the ISDB-T system and the first embodiment, respectively. As shown in FIG. 3B, in the first embodiment, B110 that is undefined (all “1”) in the ISDB-T method is changed as follows.

B110: “0” indicates LDM transmission, “1” indicates no LDM transmission (ISDB-T method only)
As a result, the receiving apparatus compatible with the new broadcasting system can recognize the presence or absence of LDM transmission without adversely affecting the existing ISDB-T receiving apparatus.

  When B110 is “0”, B111 to B121, which are undefined (all “1”) in the ISDB-T system in the first embodiment, are changed as follows.

B111 to B112: UL / LL signal power ratio, “00” is 17.5 dB, “01” is 20 dB, “10” is 22.5 dB, “11” is 25 dB
B113 / B114 / B115: Carrier modulation mapping method of each layer LL signal, “0” is 256 NUQAM, “1” is 1024QAM
B116 to B117 / B118 to B119 / B120 to B121: LDPC coding rate of each layer LL signal, “00” is 1/2, “01” is 2/3, “10” is 3/4, “ 11 ”is 5/6

  With the above configuration, the hierarchical composition unit 5051 and later performs the same operation as the ISDB-T system, and assigns control information related to LDM transmission to a bit group that has not been defined in the ISDB-T TMCC signal. The adverse effect on the corresponding existing receiving apparatus can be eliminated.

  In Non-Patent Document 2, since the UL and LL transmission RF signals are simply added, the added transmission signal has poor accuracy as the LDM system. On the other hand, in the first embodiment, since the addition of the LDM system is not particularly performed on the SP signal, the transmission signal is highly accurate as the LDM system. Therefore, it is possible to accurately estimate the transmission path with both the existing receiver compatible with the current broadcast and the receiver compatible with the new broadcast system. Thereby, in particular, a receiver compatible with the new broadcasting system can accurately decode the UL signal and the LL signal.

<Existing ISDB-T receiving apparatus and receiving method>
FIG. 4 is a diagram showing a configuration of an existing ISDB-T receiving apparatus 3300. The ISDB-T receiver 3300 in FIG. 4 corresponds to the transmitter 5000 in FIG. 23 and reflects the function of the transmitter 5000.

  ISDB-T receiver 3300 includes a tuner unit 3305, an A / D conversion unit 3308, a demodulation unit 3311, a frequency deinterleaving unit 3315, a time deinterleaving unit 3321, a multi-layer TS playback unit 3331, and an FEC decoding. And a TMCC signal decoding unit 3335.

  Hereinafter, the operation of the ISDB-T receiving apparatus 3300 will be described. When an analog RF transmission signal is input from the receiving antenna Rx-1 to the signal transmitted from the transmission device 5000 in FIG. 23, the tuner unit 3305 selects the signal of the selected frequency channel (CH-Y). Received and down-converted to a predetermined band. An A / D converter 3308 performs A / D conversion and outputs a digital received signal. The demodulator 3311 performs OFDM demodulation and outputs the equalized I / Q coordinate mapping data (cell) and the channel estimation value to the frequency deinterleaver 3315, and outputs the FFT output before equalization to the TMCC signal decoder. To 3335.

  The TMCC signal decoding unit 3335 performs differential BPSK demodulation on each carrier in which the TMCC signal shown in FIG. 26 is arranged, on the FFT output before equalization output from the demodulation unit 3311, and collects each segment. The demodulated result is majority-decoded to decode the TMCC signal. The decoded TMCC signal is output to the demodulation unit 3311, the frequency deinterleaving unit 3315, the time deinterleaving unit 3321, the multi-layer TS reproduction unit 3331, and the FEC decoding unit 3333, and the TMCC signal decoded by each unit is converted into the TMCC signal. Based on the action.

  The frequency deinterleaving unit 3315 performs frequency for the partial receiving unit, the differential modulation unit, and the synchronous modulation unit with respect to the equalized I / Q coordinate mapping data and the transmission path estimation value output from the demodulation unit 3311. Perform deinterleaving. The time deinterleaving unit 3321 performs time deinterleaving on the output from the frequency deinterleaving unit 3315.

  FIG. 5 is a diagram showing a configuration of the multi-tier TS playback unit 3331. As shown in FIG. The multi-layer TS playback unit 3331 includes a demapping unit 3401, a bit deinterleave unit 3411, a depuncture unit 3421, and a TS playback unit 3431. The demapping unit 3401 performs a demapping process based on the equalized I / Q coordinate mapping data and the transmission path estimation value that have been rearranged by the frequency deinterleaving unit 3315 and the time deinterleaving unit 3321. The bit deinterleave unit 3411 performs bit deinterleave, and the depuncture unit 3421 performs depuncture processing. The TS playback unit 3431 performs TS playback for each layer with respect to the output of the depuncture unit 3421.

  FIG. 6 is a diagram illustrating a configuration of the FEC decoding unit 3333. The FEC decoding unit 3333 includes a Viterbi decoding unit 3441, a byte deinterleaving unit 3451, an energy despreading unit 3461, and an RS decoding unit 3471. The Viterbi decoding unit 3441 performs Viterbi decoding, the byte deinterleaving unit 3451 performs byte deinterleaving, the energy despreading unit 3461 performs energy despreading, and the RS decoding unit with respect to the output from the multi-layer TS reproduction unit 3331. 3471 performs RS decoding.

  Through the above operation, the ISDB-T receiving apparatus 3300 in FIG. 4 outputs the TS of each layer of the ISDB-T system that has been subjected to error correction decoding for the signal transmitted from the transmitting apparatus 5000 in FIG. Note that the integrated circuit 3341 may include the components other than the tuner unit 3305 in the ISDB-T reception device 3300 in FIG.

  As shown in FIG. 3, the new broadcasting system (LL signal) has lower power than the ISDB-T system (UL signal), and its range is 17.5 dB to 25 dB. Since the required C / N of the current broadcast by the ISDB-T method is about 20 dB, the new broadcast method (LL signal) is buried at a power level below the noise at a reception point near the required C / N. Therefore, adverse effects on the existing ISDB-T receiver can be eliminated.

  In addition, since the LDM method is not added to the SP signal, the existing ISDB-T receiver can accurately estimate the transmission path, and as a result, the ISDB-T method (UL signal) can be accurately decoded. Can be done well.

<Reception device and reception method>
FIG. 7 is a diagram showing a configuration of receiving apparatus 3500 according to Embodiment 1 of the present invention. A reception device 3500 in FIG. 7 corresponds to the transmission device 3000 in FIG. 1 and reflects the function of the transmission device 3000. The same components as those of the existing ISDB-T receiving apparatus are denoted by the same reference numerals, and description thereof is omitted.

  The receiving device 3500 has a configuration in which the TMCC signal decoding unit 3335 is replaced with a TMCC signal decoding unit 3535, as compared with the ISDB-T receiving device 3300 shown in FIG. Further, a UL reception signal reconstruction unit 3551, a delay unit 3553, a subtraction unit 3555, and an FEC decoding unit 3533 are added.

  Hereinafter, the operation of receiving apparatus 3500 will be described. When an analog RF transmission signal is input from the reception antenna Rx-1 to the signal transmitted from the transmission device 3000 in FIG. 1, a tuner unit 3305, an A / D conversion unit 3308, a demodulation unit 3311, a frequency The deinterleaving unit 3315, the time deinterleaving unit 3321, the multi-layer TS playback unit 3331, and the FEC decoding unit 3333 perform the same operation as the ISDB-T receiving apparatus 3300 shown in FIG. The TS (UL decoded signal) of each layer of the ISDB-T system that has been subjected to error correction decoding is output.

  The TMCC signal decoding unit 3535 performs basically the same operation as the TMCC signal decoding unit 3335 in FIG. 4, but constructs a UL reception signal including the new broadcasting system bit groups B110 to B121 in the TMCC signal shown in FIG. 3. It also has a function of outputting to the generating unit 3551 and the FEC decoding unit 3533.

  Next, the UL received signal reconstructing unit 3551 uses the transmission path estimation value and the UL decoded signal output from the FEC decoding unit 3333, and receives the received signal (I / Q coordinates after equalization) when transmitted only in the UL. The mapping data).

  The delay unit 3553 delays the equalized I / Q coordinate mapping data output from the time deinterleave unit 3321 and matches the timing with the output of the UL received signal reconstruction unit 3551. The subtracting unit 3555 subtracts the output of the UL received signal reconstruction unit 3551 from the output of the delay unit 3553, and outputs it as a received signal (I / Q coordinate mapping data after equalization) when transmitted only by LL.

  FIG. 8 is a diagram illustrating a configuration of the FEC decoding unit 3533. The FEC decoding unit 3533 includes a demapping unit 3561, a bit deinterleaving unit 3563, an LDPC decoding unit 3565, a BCH decoding unit 3567, an energy despreading unit 3569, and a TS reproduction unit 3571.

  When the received signal (I / Q coordinate mapping data after equalization) transmitted from the subtraction unit 3555 only by LL is input, the demapping unit 3561 performs demapping processing, and the bit deinterleaving unit 3563 Bit deinterleaving is performed, the LDPC decoding unit 3565 performs LDPC decoding, the BCH decoding unit 3567 performs BCH decoding, the energy despreading unit 3569 performs energy despreading, and the TS reproduction unit 3571 performs TS reproduction. Through the above operation, the receiving apparatus 3500 in FIG. 7 outputs TS (LL decoded signal) of each layer of the new broadcasting system that has been subjected to error correction decoding for the signal transmitted from the transmitting apparatus 5000 in FIG. . Note that the integrated circuit 3541 may include components other than the tuner unit 3305 in the reception device 3500 in FIG.

  With the above configuration, the receiver compatible with the new broadcasting system detects control information related to the LDM transmission assigned to the bit group that is undefined in the ISDB-T TMCC signal, and decodes the UL signal and the LL signal. It can be performed.

  Further, since the addition of the LDM method is not performed on the SP signal, the reception apparatus compatible with the new broadcasting method can accurately estimate the transmission path, and as a result, the UL signal and the LL signal can be accurately decoded. Can do.

(Embodiment 2)
<Transmission device and transmission method>
FIG. 9 is a diagram showing a configuration of transmitting apparatus 3600 according to Embodiment 2 of the present invention. The same components as those of the conventional transmission device and the transmission device of Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

  9 is different from transmission device 3000 in the first embodiment shown in FIG. 1 in that TMCC / AC signal generation unit (for LL) 3691, power difference control unit 3251, addition unit 3261, and power In this configuration, a normalization unit 3271 is added.

  A TMCC / AC signal generation unit (for LL) 3691 generates a TMCC signal as control information and an AC signal as additional information for LL. The TMCC signal to be generated may be the same as the information shown in FIG. 3B, or the number of patterns that can be set may be increased by increasing the number of bits of each parameter (UL / LL signal power ratio, etc.). . Or you may increase the kind of parameter. The power difference control unit 3251, the addition unit 3261, and the power normalization unit 3271 perform the same operation as FIG. 2 on the outputs of the TMCC / AC signal generation unit 5091 and the TMCC / AC signal generation unit (for LL) 3691.

  Note that when the TMCC / AC signal generation unit 5091 generates at least B110 (presence / absence of LDM transmission) of the information shown in FIG. 3 (b), the receiver corresponding to the new broadcasting system can easily detect the presence / absence of LDM transmission. it can. However, all or part of B110 to B121 may be generated.

  Frame configuration section 5101 is an ISDB-T transmission frame from information data output from frequency interleave section 5071, pilot signal for synchronous reproduction output from pilot signal generation section 5081, and TMCC signal output from power normalization section 3271. Configure.

  Other operations are the same as those of transmitting apparatus 3000 in the first embodiment shown in FIG.

  With the above configuration, the number of bits of TMCC (for LL) can be increased by adding the LDM method to TMCC, and the flexibility of the new broadcasting method can be increased. On the other hand, for the existing ISDB-T receiver, since the reception C / N of the information data and the TMCC signal can be observed at the same level, the reception C / N detection value using the TMCC signal is the same as the reception C / N of the information data. Equivalent levels and adverse effects are eliminated.

<Existing ISDB-T receiving apparatus and receiving method>
The operation of ISDB-T reception apparatus 3300 in FIG. 4 for the signal transmitted from transmission apparatus 3600 in FIG. 9 is the same as the operation for the signal transmitted from transmission apparatus 3000 in FIG.

  The signal transmitted from the transmission apparatus 3600 in FIG. 9 is added to the TMCC in the LDM system, but the new broadcast system TMCC (LL signal) is the ISDB-T system TMCC (UL signal). Compared to the lower power, the range is 17.5 dB to 25 dB. Since the required C / N for TMCC of current broadcasting by ISDB-T system is about 10 dB, the TMCC (LL signal) of the new broadcasting system is buried at a power level below noise at the reception point near the required C / N. become. Therefore, adverse effects on the existing ISDB-T receiver can be eliminated. The range of the UL / LL signal power ratio with respect to TMCC is not limited to 17.5 dB to 25 dB, and a value smaller than this range may be included in the range.

<Reception device and reception method>
FIG. 10 shows a configuration of receiving apparatus 3800 according to Embodiment 2 of the present invention. A receiving apparatus 3800 in FIG. 10 corresponds to the transmitting apparatus 3600 in FIG. 9 and reflects the function of the transmitting apparatus 3600. The same components as those of the existing ISDB-T receiving apparatus and the receiving apparatus of Embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted.

  In comparison with receiving apparatus 3500 in the first embodiment shown in FIG. 7, receiving apparatus 3800 has UL reception TMCC signal reconstructing unit 3851, delay unit 3853, subtracting unit 3855, and TMCC signal decoding unit 3835 added. It is a configuration.

  Hereinafter, the operation of receiving apparatus 3800 will be described. The UL reception TMCC signal reconstruction unit 3851 uses the UL TMCC decoded signal output from the TMCC signal decoding unit 3535 and the received TMCC signal (FFT before equalization) when transmitted only in the UL. Output).

  The delay unit 3853 delays the pre-equalization FFT output output from the demodulation unit 3311 and matches the timing with the output of the UL reception TMCC signal reconstruction unit 3851. The subtraction unit 3855 subtracts the output of the UL reception TMCC signal reconstructing unit 3851 from the output of the delay unit 3853, and outputs it as a reception TMCC signal (FFT output before equalization) when transmitted by LL only.

  The TMCC signal decoding unit 3835 performs basically the same operation as the TMCC signal decoding unit 3535, but also has a function of outputting the LL TMCC signal to the UL reception signal reconstruction unit 3551 and the FEC decoding unit 3533.

  Other operations are similar to those of receiving apparatus 3500 in the first embodiment shown in FIG. Note that the integrated circuit 3841 may be included in the receiving device 3800 in FIG.

  With the above configuration, the reception apparatus compatible with the new broadcast system can perform decoding of the UL signal and the LL signal by decoding the TMCC to which the addition of the LDM system has been performed.

(Embodiment 3)
<Transmission device and transmission method>
FIG. 11 is a diagram showing a configuration of transmitting apparatus 4000 according to Embodiment 3 of the present invention. The same components as those of the conventional transmission device and the transmission device of Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

  11 is different from transmission device 3000 in Embodiment 1 shown in FIG. 1 in that pilot signal generation unit (for LL addition) 4081, power difference control unit 3251, addition unit 3261, and power normalization It is the structure which added the conversion part 3271.

  In FIG. 11, a pilot signal generation unit (for LL addition) 4081 generates a synchronous reproduction pilot signal using a pseudo-random binary sequence different from pilot signal generation unit 5081. The power difference control unit 3251, the addition unit 3261, and the power normalization unit 3271 perform the same operations as those in FIG. 2 on the outputs of the pilot signal generation unit 5081 and the pilot signal generation unit (for LL addition) 4081.

  The frame configuration unit 5101 uses the ISDB-T method from the information data output from the frequency interleaving unit 5071, the synchronous reproduction pilot signal output from the power normalization unit 3271, and the TMCC signal output from the TMCC / AC signal generation unit 5091. Construct a transmission frame.

  Other operations are the same as those of transmitting apparatus 3000 in the first embodiment shown in FIG.

  With the above configuration, addition of the LDM method is also performed on pilot signals such as SP signals. Thus, since the existing ISDB-T receiver can observe the reception C / N of the information data and the pilot signal at the same level, the reception C / N detection value using the pilot signal is the same as the reception C / N of the information data. Equivalent levels and adverse effects are eliminated. On the other hand, since the pilot signal subjected to the addition of the LDM method is already known for the receiver compatible with the new broadcasting method, the transmission path can be estimated with high accuracy, and as a result, the UL signal and the LL signal can be accurately decoded. Can be done well.

<Existing ISDB-T receiving apparatus and receiving method>
The operation of ISDB-T reception apparatus 3300 in FIG. 4 for the signal transmitted from transmission apparatus 4000 in FIG. 11 is the same as the operation for the signal transmitted from transmission apparatus 3000 in FIG.

  The signal transmitted from the transmission apparatus 4000 in FIG. 11 is subjected to addition of the LDM scheme to the pilot signal such as the SP signal. However, for the existing ISDB-T reception apparatus, reception of information data and pilot signals is performed. Since the C / N can be observed at the same level, the received C / N detection value using the pilot signal becomes the same level as the received C / N of the information data, and adverse effects are eliminated.

<Reception device and reception method>
FIG. 12 is a diagram showing a configuration of receiving apparatus 4600 according to Embodiment 3 of the present invention. The reception device 4600 in FIG. 12 corresponds to the transmission device 4000 in FIG. 11 and reflects the function of the transmission device 4000. The same components as those of the existing ISDB-T receiving apparatus and the receiving apparatuses of Embodiments 1 and 10 are denoted by the same reference numerals, and description thereof is omitted.

  Receiving apparatus 4600 has a configuration in which demodulating section 3311 is replaced with demodulating section 4611 as compared with receiving apparatus 3500 in FIG.

  In receiving apparatus 4600 of FIG. 12, demodulation section 4611 considers that the SP signals of ISDB-T method and new broadcasting method generated using different pseudo-random binary sequences are added with a power difference added. Then, OFDM demodulation is performed as a known SP signal.

  Other operations are similar to those of receiving apparatus 3500 in the first embodiment shown in FIG. Note that the receiving circuit 4600 in FIG. 12 may include the components other than the tuner unit 3305 to form the integrated circuit 4641.

  With the above configuration, the reception apparatus compatible with the new broadcast system can perform OFDM demodulation using the pilot signal added with the LDM system as a known signal and decode the UL signal and the LL signal with high accuracy.

(Embodiment 4)
<Transmission device and transmission method>
FIG. 13 is a diagram showing a configuration of transmitting apparatus 4100 according to Embodiment 4 of the present invention. The same components as those of the conventional transmitter and the transmitters of Embodiments 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.

  The transmission device 4100 in FIG. 13 has a configuration in which the hierarchical processing unit 3041 is replaced with a hierarchical processing unit 4141 as compared with the transmission device 3000 in the first embodiment shown in FIG.

  FIG. 14 is a diagram illustrating a configuration of the hierarchy processing unit 4141. Compared with the hierarchical processing unit 3041 in the first embodiment shown in FIG. 2, a selector 4145 is added.

  When the selection signal “0” is input to the hierarchy processing unit 4141 in FIG. 14, the selector 4145 selects the output of the power normalization unit 3271. That is, the output of the hierarchy processing unit 4141 is the same as the output of FIG.

  On the other hand, when the selection signal “1” is input to the hierarchical processing unit 4141 in FIG. 14, the selector 4145 selects the output of the mapping unit 3241. That is, the output of the hierarchical processing unit 4141 is a carrier modulation signal (LL) of the new broadcast system, but the power cannot be lowered.

  FIG. 15 shows a part of the definition of the TMCC signal. FIGS. 15A and 15B show definitions of B20 to B21 in the TMCC signal in the ISDB-T system and the fourth embodiment, respectively. As shown in FIG. 15 (b), in the fourth embodiment, B20 to B21 = “10”, which is undefined in the ISDB-T system, is newly added as a “second generation terrestrial digital television broadcasting system”. Define. Therefore, when B20 to B21 = “00”, the selection signal “0” is input to the hierarchical processing unit 4141, and when B20 to B21 = “01”, the selection signal “1” is input to the hierarchical processing unit 4141. Is done.

  Other operations are the same as those of transmitting apparatus 3000 in the first embodiment shown in FIG.

  With the above configuration, the hierarchical processing unit can select one of the signals only for the LDM scheme by the transmission apparatus 3000 and the new broadcast scheme (LL signal) in the first embodiment shown in FIG. As a result, the current broadcasting (UL signal) based on the ISDB-T system will be stopped several years after the application method of the LDM system is put into practical use, and the new broadcasting system (LL signal) will only be used. Can be built.

<Existing ISDB-T receiving apparatus and receiving method>
The operation of ISDB-T reception apparatus 3300 in FIG. 4 with respect to the signal transmitted from transmission apparatus 4300 in FIG. 13 will be described only with respect to the difference from the operation with respect to the signal transmitted from transmission apparatus 3000 in FIG.

  When B20 to B21 = “10” in the TMCC signal in the transmission device 4300 in FIG. 13, the TMCC signal decoding unit 3335 in the ISDB-T reception device 3300 in FIG. 4 interprets the transmission signal as undefined, It is determined that reception is impossible.

  On the other hand, when B20 to B21 = “00” in the TMCC signal in the transmission device 4300 in FIG. 13, the TMCC signal decoding unit 3335 in the ISDB-T reception device 3300 in FIG. 4 transmits the transmission signal to the terrestrial digital television broadcasting system ( ISDB-T), and the TS of each layer of the ISDB-T system is output by performing the same operation as in the first embodiment and performing error correction decoding.

<Reception device and reception method>
FIG. 16 is a diagram showing a configuration of receiving apparatus 4700 according to Embodiment 4 of the present invention. A receiving apparatus 4700 in FIG. 16 corresponds to the transmitting apparatus 4100 in FIG. 13 and reflects the function of the transmitting apparatus 4100. The same components as those of the existing ISDB-T receiver and the receivers of Embodiments 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.

  Receiving apparatus 4700 has a configuration in which TMCC signal decoding section 3535 is replaced with TMCC signal decoding section 4735 and selector 4145 is added, compared with receiving apparatus 3500 in the first embodiment shown in FIG.

  The operation of receiving apparatus 4700 when B20 to B21 = “10” in the TMCC signal in transmitting apparatus 4300 in FIG. 13 will be described below. In this case, the TMCC signal decoding unit 4735 interprets the transmission signal as a second generation terrestrial digital television broadcasting system, and outputs a selection signal “1” to the selector 4145.

  The selector 4145 selects the output of the time deinterleave unit 3321. That is, the output of the selector 4145 is the mapping data of the I and Q coordinates after the equalization of the carrier modulation signal (LL) of the new broadcast system and the transmission path estimation value, but the power cannot be lowered by the transmission device 4100 of FIG. Corresponds to the signal sent to.

  The FEC decoding unit 3533 performs the same operation as in FIG. 7 and outputs TS of each layer of the new broadcasting system that has been subjected to error correction decoding.

  Other operations are similar to those of receiving apparatus 3500 in the first embodiment shown in FIG. Note that the integrated circuit 4741 may be included in the receiving device 4700 of FIG.

  On the other hand, when B20 to B21 in the TMCC signal is “00” in the transmission device 4300 in FIG. 13, the TMCC signal decoding unit 4735 interprets the transmission signal as a digital terrestrial television broadcasting system and sends a selection signal “0” to the selector 4145. "Is output. The other operations are the same as those of receiving apparatus 3500 in the first embodiment shown in FIG. 7, and the TS (UL decoded signal) of each layer of the ISDB-T system and the TS (LL decoded signal) of each layer of the new broadcasting system. Is output.

  With the above configuration, the receiver for the new broadcast system stops the current broadcast (UL signal) using the ISDB-T system several years after the application method of the LDM system is put into practical use, and the new broadcast ( Even when only the LL signal is received, TS (LL decoded signal) of each layer of the new broadcasting system can be output. In particular, in this case, since the transmission device 4100 in FIG. 13 receives the transmitted signal without reducing the power, the reception area of the new broadcast system by the reception device 4700 is expanded.

(Embodiment 5)
<Transmission device and transmission method>
FIG. 17 shows a configuration of transmitting apparatus 4200 according to Embodiment 5 of the present invention. The same components as those of the conventional transmitter and the transmitters of Embodiments 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.

  The transmission apparatus 4200 in FIG. 17 is different from the transmission apparatus 4100 in the fourth embodiment shown in FIG. 13 in the hierarchical synthesis unit 5051, time interleaving unit 5061, frequency interleaving unit 5071, pilot signal generation unit 5081, and TMCC / AC signal generation. Unit 5091, frame configuration unit 5101 and OFDM signal generation unit 5111, layer synthesis unit 4251, time interleaving unit 4261, frequency interleaving unit 4271, pilot signal generation unit 4281, TMCC / AC signal generation unit 4291, frame configuration unit 4301 and OFDM In this configuration, the signal generator 4311 is replaced. A selection signal is input to these processing units, and processing is switched based on whether the value is “0” or “1”.

  When the selection signal is “0”, these processing units have the same FFT size and GI values as the ISDB-T system (FFT size is 2k, as in the transmission apparatus 4100 in Embodiment 4 shown in FIG. 3). 3 types of 4k and 8k, and 4 types of GI (1/4, 1/8, 1/16, 1/32).

  On the other hand, when the selection signal is “1”, the operation of the transmission device 4200 will be described below. In this case, only the new broadcast (LL signal) by the new broadcast system is used, and these processing units have different values from the ISDB-T system (for example, 5 types of FFT sizes 2k, 4k, 8k, 16k, 32k, GI is (Six types of 1/4, 1/8, 1/16, 1/32, 1/64, 1/128).

  When the selection signal is “1”, the layer synthesis unit 4251, the time interleaving unit 4261, and the frequency interleaving unit 4271 also have processing functions for two types of FFT sizes of 16k and 32k.

  FIG. 18 shows a segment configuration of the fifth embodiment, taking as an example a synchronous modulation section with an FFT size of 32k when the selection signal is “1”. As shown in FIG. 26, the segment of the synchronous modulation section having an FFT size of 2k is composed of 108 carriers. On the other hand, as shown in FIG. 18, when the FFT size is 32k, it is composed of 16 times 1728 carriers. In FIG. 18, the SP signal is repeatedly arranged at a period of 4 symbols as in FIG. 26, and is shifted by 3 carriers for each symbol. However, the arrangement pattern of the SP signal is not limited to this, and may be selected from a plurality of types. In addition, TMCC signal and AC signal carriers are randomly arranged in the frequency direction in order to reduce the influence of periodic dips on transmission path characteristics due to multipath. The number of carriers per segment of the TMCC signal and the AC signal is 16 times that of the FFT size of 2k, but the value is not limited to this. Thus, pilot signal generation section 4281 and TMCC / AC signal generation section 4291 each generate a synchronous reproduction pilot signal such as an SP signal and a TMCC / AC signal.

  Frame composing section 4301 composes a transmission frame from the information data output from frequency interleaving section 4271, the pilot signal for synchronous reproduction output from pilot signal generating section 4281, and the TMCC signal output from TMCC / AC signal generating section 4291. To do. When the selection signal is “1”, the frame configuration unit 4301 also has a processing function for two types of FFT sizes of 16k and 32k.

  The OFDM signal generation unit 4311 inserts IFFT and GI (Guard Interval) into the transmission frame configuration output from the frame configuration unit 4301, and outputs a digital baseband transmission signal. When the selection signal is “1”, the OFDM signal generator 4311 also has a processing function for two types of FFT sizes of 16k and 32k and two types of GI of 1/64 and 1/128.

  Other operations are the same as those of transmitting apparatus 4100 in the fourth embodiment shown in FIG.

  With the above configuration, when one of the signals of only the new broadcast (LL signal) by the LDM system by the transmission apparatus 3000 and the new broadcast system in Embodiment 1 shown in FIG. 1 can be selected, the method of applying the LDM system is practical. It is possible to construct a system with a view that the current broadcasting (UL signal) based on the ISDB-T system will be stopped some years later and only new broadcasting (LL signal) based on the new broadcasting system will be provided. In particular, when only a new broadcast (LL signal) by the new broadcast system is used, it is possible to operate corresponding to values different from those of the ISDB-T system in terms of FFT size and GI.

<Existing ISDB-T receiving apparatus and receiving method>
The operation of ISDB-T receiving apparatus 3300 in FIG. 4 with respect to the signal transmitted from transmitting apparatus 4200 in FIG. 17 will be described only with respect to the difference from the operation with respect to the signal transmitted from transmitting apparatus 4100 in FIG.

  When B20 to B21 = “10” in the TMCC signal in the transmission device 4200 of FIG. 17, the ISDB-T reception device 3300 detects a signal transmitted with an FFT size different from the ISDB-T method (16k, 32k). Can not do it. The ISDB-T receiving device 3300 can decode the TMCC signal when the FFT size is the same value (2k, 4k, 8k) as the ISDB-T method, and it is determined that reception is impossible. The same. In either case, it is determined that reception is impossible, but the former is determined based on the fact that signal detection is impossible, and the latter is determined based on the TMCC signal decoding result.

  On the other hand, when B20 to B21 = “00” in the TMCC signal in the transmission device 4300 in FIG. 13, the TMCC signal decoding unit 3335 in the ISDB-T reception device 3300 in FIG. 4 transmits the transmission signal to the terrestrial digital television broadcasting system ( ISDB-T), and the TS of each layer of the ISDB-T system is output by performing the same operation as in the first embodiment and performing error correction decoding.

<Reception device and reception method>
FIG. 19 is a diagram showing a configuration of receiving apparatus 4800 in Embodiment 5 of the present invention. A reception device 4800 in FIG. 19 corresponds to the transmission device 4200 in FIG. 17 and reflects the function of the transmission device 4200. The same components as those of the existing ISDB-T receiver and the receivers of Embodiments 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.

  In comparison with receiving apparatus 4700 in Embodiment 4 shown in FIG. 16, receiving apparatus 4800 includes demodulation section 3311, frequency deinterleaving section 3315, time deinterleaving section 3321 and TMCC signal decoding section 4735, demodulating section 4811 and frequency deinterleaving section 4735. In this configuration, a deinterleaving unit 4815, a time deinterleaving unit 4821, and a TMCC signal decoding unit 4835 are respectively replaced. A selection signal is generated by the TMCC signal decoding unit 4835 and input to these processing units, and the processing is switched based on whether the value is “0” or “1”.

  When the selection signal is “0”, these processing units have the same FFT size and GI values as the ISDB-T system (FFT size is 2k, as in the receiving apparatus 4700 in Embodiment 4 shown in FIG. 16). 3 types of 4k and 8k, and 4 types of GI (1/4, 1/8, 1/16, 1/32). Therefore, the receiving apparatus 4800 outputs the TS (UL decoded signal) of each layer of the ISDB-T system and the TS (LL decoded signal) of each layer of the new broadcasting system.

  On the other hand, when the selection signal is “1”, when only a new broadcast (LL signal) by the new broadcast method is used, these processing units are different from the ISDB-T method (for example, the FFT size is 2k, 4k, 5 types of 8k, 16k, and 32k, and 6 types of GI of 1/4, / 8, 1/16, 1/32, 1/64, and 1/128).

  When the selection signal is “1”, the demodulator 4811 performs OFDM demodulation, but also has a processing function for two types of FFT sizes of 16k and 32k and two types of GI of 1/64 and 1/128.

  The TMCC signal decoding unit 4835 decodes the TMCC signal with respect to the FFT output before equalization output from the demodulation unit 4811, but also has a processing function for two types of FFT sizes of 16k and 32k. The TMCC signal decoding unit 4835 generates and outputs a selection signal based on the decoding result of the TMCC signal.

  When the selection signal is “1”, the frequency deinterleave unit 4815 and the time deinterleave unit 4821 also have a processing function for two types of FFT sizes of 16k and 32k.

  Other operations are the same as those of receiving apparatus 4700 in the fourth embodiment shown in FIG. 16, and TS of each layer of the new broadcasting system that has been subjected to error correction decoding is output. Note that the integrated circuit 4841 may be included in the receiving device 4800 in FIG.

  With the above configuration, the receiver for the new broadcast system stops the current broadcast (UL signal) using the ISDB-T system several years after the application method of the LDM system is put into practical use, and the new broadcast ( Even when only the LL signal is received, the TS (LL decoded signal) of each layer of the new broadcasting system is output. In particular, in this case, since the transmission apparatus 4200 in FIG. 17 receives the signal transmitted without reducing the power, the reception area of the new broadcasting system by the reception apparatus 4800 is widened, and the reception apparatus 4800 has the FFT size and GI. It becomes possible to operate corresponding to values different from those in the ISDB-T system.

(Embodiment 6)
<Transmission device and transmission method>
FIG. 20 is a diagram showing a configuration of transmitting apparatus 4400 according to Embodiment 6 of the present invention. The same components as those of the conventional transmission device and the transmission devices of Embodiments 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

  20 is compared with transmission apparatus 4100 in Embodiment 4 shown in FIG. 13, time interleaving section 4461, frequency interleaving section 4471, pilot signal generation section 4481, frame configuration section 4501, signaling generation section 4541, and so on. In this configuration, a preamble generation unit 4551 and two selectors 4445-1 and 2 are added, and the OFDM signal generation unit 5111 is replaced with an OFDM signal generation unit 4311. Based on whether the value of the selection signal is “0” or “1”, as an output of the transmission device 4400, a signal of only a new broadcast by the LDM method and the new broadcast method by the transmission device 3000 in the first embodiment shown in FIG. Either one is selected.

  When the selection signal is “0”, an LDM transmission signal is selected by transmission apparatus 3000 in Embodiment 1 shown in FIG. 1 and output from transmission apparatus 4400. In this case, as in transmitting apparatus 4100 in Embodiment 4 shown in FIG. 13, the FFT size and GI value are the same as those in ISDB-T system (FFT sizes are 2k, 4k, and 8k, and GI is 1 / (4, 1/8, 1/16, 1/32).

  On the other hand, the operation of transmitting apparatus 4400 when the selection signal is “1” will be described below. In this case, different values from the ISDB-T system (for example, 5 types of FFT sizes 2k, 4k, 8k, 16k, and 32k, GI are 1/4, 1/8, 1/16, 1/32, 1 / 6 types of 64 and 1/128). Further, a plurality of layers are not divided in the frequency direction using the segment structure, but are divided in the time direction using a structure in which each layer is stored in a subframe.

  When the selection signal is “1”, the time interleaving unit 4461 and the frequency interleaving unit 4471 perform interleaving using the subframe structure, not interleaving using the segment structure. It also has a processing function for two types of FFT sizes of 16k and 32k.

  FIG. 21 shows an SP signal arrangement pattern of the sixth embodiment when the selection signal is “1”. As shown in FIG. 21, similarly to FIGS. 18 and 78, SP signals are repeatedly arranged with a period of 4 symbols, and shifted by 3 carriers for each symbol. However, the arrangement pattern of the SP signal is not limited to this, and may be selected from a plurality of types. Also, no carrier for TMCC signal and AC signal is provided. Thus, pilot signal generation section 4481 generates a synchronous reproduction pilot signal such as an SP signal.

  Frame configuration section 4501 configures a transmission frame from information data output from frequency interleaving section 4471 and a pilot signal for synchronous reproduction output from pilot signal generation section 4481. The frame configuration unit 4501 stores information data of each layer in a subframe in each transmission frame.

  When the selection signal is “1”, the selector 4445-1 selects and outputs the output of the frame configuration unit 4501.

  The OFDM signal generation unit 4311 inserts IFFT and GI into the transmission frame configuration output from the selector 44445-1, and outputs a digital baseband transmission signal. When the selection signal is “1”, the OFDM signal generator 4311 also has a processing function for two types of FFT sizes of 16k and 32k and two types of GI of 1/64 and 1/128.

  The signaling generation unit 4541 generates signaling (control information similar to TMCC) that is control information. A preamble generation unit 4551 generates a preamble for transmitting signaling and adds it to the head of the transmission frame.

  When the selection signal is “1”, the selector 4445-2 selects and outputs the output of the preamble generation unit 4551.

  Other operations are the same as those of transmitting apparatus 4100 in the fourth embodiment shown in FIG.

  With the above configuration, when one of the signals of only the new broadcast (LL signal) by the LDM system by the transmission apparatus 3000 and the new broadcast system in Embodiment 1 shown in FIG. 1 can be selected, the method of applying the LDM system is practical. It is possible to construct a system with a view that the current broadcasting (UL signal) based on the ISDB-T system will be stopped some years later and only new broadcasting (LL signal) based on the new broadcasting system will be provided. In particular, when only a new broadcast (LL signal) by the new broadcast system is used, it becomes possible to operate the FFT size and GI values corresponding to values different from those of the ISDB-T system, and further subframes for each layer. It is also possible to divide in the time direction by using the structure stored in.

<Existing ISDB-T receiving apparatus and receiving method>
The operation of ISDB-T receiving apparatus 3300 in FIG. 4 with respect to the signal transmitted from transmitting apparatus 4400 in FIG. 20 will be described only with respect to the difference from the operation with respect to the signal transmitted from transmitting apparatus 4100 in FIG.

  When the selection signal is “1” in the transmission apparatus 4400 of FIG. 20, the ISDB-T reception apparatus 3300 cannot detect a signal transmitted in a time division frame structure using a preamble and a subframe.

  On the other hand, when the selection signal is “0” in the transmission apparatus 4400 in FIG. 20, the TMCC signal decoding unit 3335 in the ISDB-T reception apparatus 3300 in FIG. 4 uses the transmission signal as a terrestrial digital television broadcasting system (ISDB-T). Interpretation is performed, and the TS of each layer of the ISDB-T system that has been performed up to error correction decoding by performing the same operation as in the first embodiment is output.

<Reception device and reception method>
FIG. 22 is a diagram showing a configuration of receiving apparatus 4900 according to Embodiment 6 of the present invention. The reception device 4900 in FIG. 22 corresponds to the transmission device 4400 in FIG. 20 and reflects the function of the transmission device 4400. The same components as those of the existing ISDB-T receiver and the receivers of Embodiments 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

  Compared with receiving apparatus 3500 in Embodiment 1 shown in FIG. 7, receiving apparatus 4900 adds frequency deinterleaving section 4915, time deinterleaving section 4921, preamble detecting section 4961, and selector 4945, and demodulates demodulating section 3311. The configuration is replaced with a unit 4811.

  When the selection signal is “0” in transmission apparatus 4400 in FIG. 20, reception apparatus 4900 in FIG. 22 performs the same operation as reception apparatus 3500 in Embodiment 1 shown in FIG. TS (UL decoded signal) and TS (LL decoded signal) of each layer of the new broadcasting system are output. Note that the receiving apparatus 4900 has the same FFT size and GI values as those of the ISDB-T system (3 types of FFT sizes 2k, 4k, and 8k, and GIs of 1/4, 1/8, 1/16, and 1/32). 4 types).

  On the other hand, regarding the case where the selection signal is “1” in the transmission apparatus 4400 of FIG. 20, the operation of the reception apparatus 4900 will be described below.

  A preamble detection unit 4961 detects a preamble from the digital reception signal of the A / D conversion unit 3308, and outputs signaling of a new broadcast method included in the preamble.

  The demodulator 4811 performs OFDM demodulation, but also has processing functions for two types of FFT sizes of 16k and 32k and two types of GI of 1/64 and 1/128.

  A frequency deinterleaving unit 4915 and a time deinterleaving unit 4921 perform deinterleaving using a subframe structure on the output of the demodulating unit 4811.

  The selector 4945 selects and outputs the output of the time deinterleave unit 4921.

  Other operations are the same as those of receiving apparatus 3500 in the first embodiment shown in FIG. 7, and TS of each layer of the new broadcasting system that has been subjected to error correction decoding is output. Note that the integrated circuit 4941 may be included in the reception device 4900 in FIG.

  With the above configuration, the receiver for the new broadcast system stops the current broadcast (UL signal) using the ISDB-T system several years after the application method of the LDM system is put into practical use, and the new broadcast ( Even when only the LL signal is received, the TS (LL decoded signal) of each layer of the new broadcasting system is output. In particular, in this case, since the transmission apparatus 4400 in FIG. 20 receives the signal transmitted without reducing the power, the reception apparatus 4900 expands the viewable area of the new broadcast system, and the reception apparatus 4900 has the FFT size and GI. It becomes possible to operate corresponding to values different from those in the ISDB-T system. Further, in this case, receiving apparatus 4900 can operate in correspondence with a transmission signal divided in the time direction using a structure in which each layer is stored in a subframe.

(Supplement)
The present disclosure is not limited to the contents described in the first to sixth embodiments, and can be implemented in any form for achieving the purpose of the present disclosure and the related or incidental purposes. May be.

  (1) In Embodiments 1 to 6, the input to the transmission device for the new broadcasting system is TS, but the present invention is not limited to this. For example, an IP packet, MMT (MPEG Media Transport), or a packet encapsulating them may be used. .

  (2) In the first to fifth embodiments, the definition of B110 to B121 in the TMCC signal is as shown in FIG. 3, but is not limited thereto. The values of the UL / LL signal power ratio, the carrier modulation mapping method of each layer LL signal, and the LDPC coding rate of each layer LL signal may be different from those in FIG.

  (3) In Embodiments 4 to 6, as values different from the ISDB-T system, there are five types of FFT sizes 2k, 4k, 8k, 16k, and 32k, and GI is 1/4, 1/8, 1/16, Although six types of 1/32, 1/64, and 1/128 are shown, this is an example, and the present invention is not limited to this.

  (4) In the first to sixth embodiments, the LDM method is added immediately after the mapping unit. However, the present invention is not limited to this. The addition of the LDM method can be performed between the mapping unit and the OFDM signal generation unit.

  (5) Some of the first to sixth embodiments may be combined with each other.

  (6) The above first to sixth embodiments may relate to mounting using hardware and software. The above-described embodiments may be implemented or executed using a computing device (processor). The computing device or processor is, for example, a main processor / general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable device such as a FPGA (field programmable gate, etc.). It may be. The above embodiments may be executed or realized by combining these devices.

  (7) The first to sixth embodiments may be realized by a mechanism of a software module that is executed by a processor or directly by hardware. A combination of software modules and hardware implementation is also possible. The software modules may be stored on various types of computer readable storage media, such as RAM, EPROM, EEPROM, flash memory, registers, hard disk, CD-ROM, DVD, etc.

  The transmission device, the transmission method, the reception device, the reception method, the integrated circuit, and the program according to the present disclosure can be applied to a wireless transmission method.

3000, 3600, 4000, 4100, 4200, 4400, 5000 Transmitting device 3500, 3800, 4600, 4700, 4800, 4900 Receiving device 3341, 3541, 3841, 4641, 4741, 4841, 4941 Integrated circuit 3300 ISDB-T receiving device 5011 TS remultiplexing unit 5021 RS encoding unit 5031 Hierarchy dividing unit 3041, 4141, 5041 Hierarchical processing unit 4251, 5051 Hierarchical combining unit 4261, 4461, 5061 Time interleaving unit 3321, 4821, 4921 Time deinterleaving unit 4271, 4471, 5071 Frequency Interleave unit 3315, 4815, 4915 Frequency deinterleave unit 3081, 4281, 4481, 5081 Pilot signal generation unit 4081 Pilot No. producing section (for LL addition)
4291, 5091 TMCC / AC signal generator 3691 TMCC / AC signal generator (for LL)
4301, 4501, 5101 Frame configuration unit 4311, 5111 OFDM signal generation unit 5121 D / A conversion unit 5131 Frequency conversion unit 3201, 5201 Energy spreading unit 3461, 3569 Energy despreading unit 5211 Byte interleaving unit 3451 Byte deinterleaving unit 5221 Convolution Encoding unit 3231, 5231 Bit interleaving unit 3411, 3563, 3911 Bit deinterleaving unit 3241, 5241 Mapping unit 3401, 3561 Demapping unit 3211 BCH encoding unit 3567 BCH decoding unit 3221 LDPC encoding unit 3565 LDPC decoding unit 3251 Power difference controller 3261 Adder 3271 Power normalizer 3305 Tuner 3308 A / D converter 4611, 4811 Demodulator 33 31 Multi-layer TS reproduction unit 3333, 3533 FEC decoding unit 3335, 3535, 3835, 4735, 4835 TMCC signal decoding unit 3421 Depuncture unit 3431, 3571 Viterbi decoding unit 3551 UL reception signal reconstruction unit 3551 UL reception TMCC signal reconstruction unit 3555, 3855 subtraction unit 3553, 3853 delay unit 4145, 4445, 4945 selector 4551 preamble generation unit 4961 preamble detection unit 5301 segment division unit 5311 inter-segment interleaving unit 5321 intra-segment carrier rotation unit 5331 intra-segment carrier randomization unit

Claims (4)

A transmission apparatus that multiplexes and transmits a plurality of data sequences including a first data sequence of a first hierarchy and a second data sequence of a second hierarchy by superposition coding,
A first mapping unit that generates a first modulation symbol sequence of the first data sequence by mapping a first bit sequence of the first data sequence;
A second mapping unit that generates a second modulation symbol sequence of the second data sequence by mapping a second bit sequence of the second data sequence;
A superimposing unit that generates a multiplexed signal by superimposing the first modulation symbol sequence and the second modulation symbol sequence at a predetermined amplitude ratio;
A first control signal is generated from first control information indicating a scheme used for transmission of the first data sequence, and second control information indicating a scheme used for transmission of the second data sequence is A control signal generator for generating two control signals;
A transmitter that transmits the multiplexed signal, the first control signal, and the second control signal;
The first control information does not include information indicating that the second data series is multiplexed on the multiplexed signal.
Transmitter device. A transmission method performed by a transmission apparatus that multiplexes and transmits a plurality of data sequences including a first data sequence of a first hierarchy and a second data sequence of a second hierarchy by superposition coding,
Generating a first modulation symbol sequence of the first data sequence by mapping a first bit sequence of the first data sequence;
Generating a second modulation symbol sequence of the second data sequence by mapping a second bit sequence of the second data sequence;
Generating a multiplexed signal by superimposing the first modulation symbol sequence and the second modulation symbol sequence at a predetermined amplitude ratio;
A first control signal is generated from first control information indicating a scheme used for transmission of the first data sequence, and second control information indicating a scheme used for transmission of the second data sequence is 2 control signals,
Transmitting the multiplexed signal, the first control signal and the second control signal;
The first control information does not include information indicating that the second data series is multiplexed on the multiplexed signal.
Transmission method. The first modulation symbol sequence generated from the first data sequence in the first layer and the second modulation symbol sequence generated from the second data sequence in the second layer are multiplexed by superposition coding. A first control signal generated from a multiplexed signal, first control information indicating a method used for transmitting the first data sequence, and a second method indicating a method used for transmitting the second data sequence. A receiving device that receives a transmission signal including a second control signal generated from control information,
A receiving unit that receives the transmission signal and obtains a reception signal;
A first control information acquisition unit that demodulates the received signal corresponding to the first control signal and acquires the first control information;
A first demodulator that demodulates the received signal corresponding to the multiplexed signal based on the first control information to obtain a first data sequence;
A second control information acquisition unit that demodulates a received signal corresponding to the second control signal and acquires the second control information;
A mapping unit that generates the first modulation symbol sequence from the output of the first demodulation unit;
A delay unit for delaying a reception signal corresponding to the multiplexed signal by a predetermined time;
A subtracting unit that subtracts a component of the first modulation symbol sequence from a received signal corresponding to the multiplexed signal delayed by the delay unit;
A second demodulator that demodulates a received signal corresponding to the multiplexed signal obtained by subtracting the component of the first modulation symbol sequence based on the second control information to obtain a second data sequence; With
The first control information does not include information indicating that the second data series is multiplexed on the multiplexed signal.
Receiver device. The first modulation symbol sequence generated from the first data sequence in the first layer and the second modulation symbol sequence generated from the second data sequence in the second layer are multiplexed by superposition coding. A first control signal generated from a multiplexed signal, first control information indicating a method used for transmitting the first data sequence, and a second method indicating a method used for transmitting the second data sequence. A receiving method implemented by a receiving device that receives a transmission signal including a second control signal generated from control information,
Receiving the transmission signal to obtain a reception signal;
Demodulating the received signal corresponding to the first control signal to obtain the first control information;
Based on the first control information, the received signal corresponding to the multiplexed signal is demodulated to obtain a first data sequence,
Demodulating a received signal corresponding to the second control signal to obtain the second control information;
From the demodulation result of the first demodulator, generate the first modulation symbol string,
A received signal corresponding to the multiplexed signal is delayed by a predetermined time;
Subtracting the component of the first modulation symbol sequence from the received signal corresponding to the delayed multiplexed signal;
Based on the second control information, a received signal corresponding to the multiplexed signal obtained by subtracting the component of the first modulation symbol string is demodulated to obtain a second data sequence,
The first control information does not include information indicating that the second data series is multiplexed on the multiplexed signal.
Receiving method.

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