JP7267378B2 - Transmitting device and receiving device - Google Patents

Description

The present invention relates to wireless transmission technology.

Terrestrial television broadcasting in Japan ended analog broadcasting in July 2011, and was completely shifted to digital broadcasting. In terrestrial television broadcasting in Japan, HDTV services are provided using the 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 Application of LDM System to Digital Terrestrial TV Broadcasting", ITE Technical Report, Vol. 40, No. 35, pp. 1-4, (October 2016)

In general, wireless transmission is required to have a large capacity. Therefore, in wireless transmission, the present disclosure is a transmitter and a receiver that can increase the transmission capacity compared to the current service without using other frequency bands when implemented in combination with the current service. An object is to provide an apparatus, a transmission method, and a reception method.

To achieve the above object, a transmitting device according to one aspect of the present disclosure superimposes a plurality of data sequences including a first data sequence of a first layer and a second data sequence of a second layer, A transmission apparatus for multiplexing and transmitting by coding, wherein a 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 superimposing unit that generates a multiplexed signal by superimposing the second modulation symbol sequence and the second modulation symbol sequence at a predetermined amplitude ratio; a control signal generating unit that generates a control signal from control information indicating the multiplexing method; a transmission unit that transmits a signal and the control signal, the control signal is transmitted by the transmission unit without being superimposed with other signals, and the control information is added to the multiplexed signal as the second data sequence. is multiplexed, the information is not used in the first communication standard among the predetermined bit arrays, and in the second communication standard different from the first communication standard It is indicated by a flag set in the bit position used.

According to the transmitting apparatus described above, in wireless transmission, when implemented in combination with current services, it is possible to increase transmission capacity compared to current services without using other frequency bands.

3 is a diagram showing the configuration of transmitting apparatus 3000 according to Embodiment 1. FIG. FIG. 4 is a diagram showing the configuration of a hierarchy processing unit 3041 according to Embodiment 1; 4 is a diagram showing part of the definition of a TMCC signal in Embodiment 1; FIG. 2 is a diagram showing the configuration of existing ISDB-T receiver 3300 in Embodiment 1. FIG. FIG. 4 is a diagram showing the configuration of a multi-layer TS reproducing unit 3331 according to Embodiment 1; FIG. 4 is a diagram showing the configuration of FEC decoding section 3333 in Embodiment 1; 3 is a diagram showing the configuration of receiving apparatus 3500 in Embodiment 1. FIG. FIG. 4 is a diagram showing the configuration of FEC decoding section 3533 in Embodiment 1; FIG. 13 is a diagram showing the configuration of transmitting apparatus 3600 in Embodiment 2; FIG. FIG. 10 is a diagram showing the configuration of receiving apparatus 3800 in Embodiment 2; FIG. 10 is a diagram showing the configuration of transmitting apparatus 4000 in Embodiment 3; FIG. 13 is a diagram showing the configuration of receiving apparatus 4600 in Embodiment 3; FIG. 20 is a diagram showing the configuration of transmitting apparatus 4100 in Embodiment 4; FIG. 23 is a diagram showing the configuration of a hierarchy processing unit 4141 according to Embodiment 4; FIG. FIG. 10 is a diagram showing part of the definition of a TMCC signal in Embodiment 4; FIG. 20 is a diagram showing the configuration of receiving apparatus 4700 according to Embodiment 4. FIG. FIG. 20 is a diagram showing the configuration of transmitting apparatus 4200 in Embodiment 5. FIG. FIG. 13 is a diagram showing a segment configuration in Embodiment 5; FIG. 20 is a diagram showing the configuration of receiving apparatus 4800 in Embodiment 5. FIG. FIG. 23 is a diagram showing the configuration of transmitting apparatus 4400 in Embodiment 6. FIG. FIG. 20 is a diagram showing an SP signal arrangement pattern when a selection signal is "1" in Embodiment 6; FIG. 20 is a diagram showing the configuration of receiving apparatus 4900 in Embodiment 6. FIG. FIG. 3 is a diagram showing the configuration of a transmission device 5000 in the ISDB-T system; FIG. 10 is a diagram showing the configuration of a hierarchical processing unit 5041 in the ISDB-T system; FIG. 10 is a diagram showing the configuration of frequency interleaving section 5071 in the ISDB-T system. FIG. 2 is a diagram showing a segment configuration of the ISDB-T system;

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

The operation of transmitting device 5000 will be described below. A plurality of TSs output from an MPEG-2 multiplexer (not shown) are input to a TS remultiplexer 5011 in order to arrange TS packets suitable for signal processing in units of data segments. The TS re-multiplexing unit 5011 converts the TS into a single TS in burst signal format in units of 188 bytes with a clock that is four times the FFT (Fast Fourier Transform) sample clock. The RS encoder 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 into a maximum of three systems (A hierarchy, B hierarchy, and C hierarchy) in accordance with the designation of the hierarchy information.

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

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

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

In FIG. 23, a pilot signal generator 5081 generates a pilot signal for synchronization reproduction. TMCC/AC signal generator 5091 generates a TMCC signal, which is control information, and an AC signal, which is additional information, in order to assist demodulation/decoding of the receiving apparatus for hierarchical transmission in which a plurality of transmission parameters are mixed. Frame configuration section 5101 is based on the information data output from frequency interleave section 5071, the pilot signal for synchronization reproduction output from pilot signal generation section 5081, and the TMCC signal output from TMCC/AC signal generation section 5091, and the ISDB-T system. constitutes the transmission frame of

FIG. 26 shows a segment configuration of the ISDB-T system, taking as an example a synchronous modulation section (QPSK, 16QAM, 64QAM) of mode 1 (FFT size is 2k). Instead of transmitting a scattered pilot signal (hereinafter referred to as SP signal: scattered pilot signal) as a pilot signal for synchronization reproduction for each subcarrier, in the frequency (subcarrier) direction and time (symbol) direction, at the symbol of symbol number n On the other hand, it is transmitted 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, the SP signals are repeatedly arranged with a period of 4 symbols, and are arranged with a shift of 3 carriers for each symbol. The SP signals arranged in this way are binary-modulated with a specific pattern determined by the carrier position and transmitted. In addition, the carriers of the TMCC signal and the AC signal are arranged randomly in the frequency direction in order to reduce the influence of periodic dips in transmission line 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 in which SP signals, TMCC signals, and AC signals are not arranged, and transmitted.

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

By the way, in recent years, UHDTV (Ultra HDTV) services that exceed the resolution of HDTV services have been actively studied. In order to realize a UHDTV service with a high bit rate, it is important to study a transmission system that enables large-capacity transmission with higher frequency utilization efficiency than the ISDB-T system. LDM (Layered Division Multiplexing) is added to the current ISDB-T system broadcasting service as a method of performing large-capacity transmission without using other frequency bands while continuing the current broadcasting service using the ISDB-T system. ) is being studied to increase the transmission capacity (Non-Patent Document 2).

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

A receiving apparatus compatible with the new broadcasting system first decodes UL data from a received RF signal, and uses the transmission path estimation value at that time to reconstruct an RF received signal that would have been transmitted only through the UL. Then, by subtracting the reconstructed UL RF reception signal from the reception RF signal, the RF reception signal transmitted only by LL is extracted and LL data is decoded.

When only the UL signal is received, the LL signal can be regarded as noise, so special processing such as reconstruction and subtraction described above is not required. Therefore, this also applies to existing receivers compatible with the current broadcasting based on the ISDB-T system.

Non-Patent Document 2 examines the possibility of continuing the current broadcasting by the ISDB-T system and performing large-capacity transmission without using other frequency bands by applying such an LDM system.

However, in such an application method of the LDM system, a system is constructed in which a receiving device compatible with the new broadcasting system can accurately decode the UL signal and the LL signal, and the system has an adverse effect on the existing receiving device compatible with the current broadcasting. must exclude In addition, it was anticipated that several years after the application of the LDM system was put into practical use, the current broadcasting (UL signal) based on the ISDB-T system would be discontinued, and only the new broadcasting (LL signal) based on the new broadcasting system would be used. It is necessary to build a method.

The inventions according to Embodiments 1 to 6, which will be described below, were made to solve the above-described problems. The object is 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)
<Transmitting device and transmitting method>
FIG. 1 is a diagram showing the configuration of transmitting apparatus 3000 according to Embodiment 1 of the present invention. The same reference numerals are used for the same components as in the conventional transmission device, and the description is omitted.

Compared with the conventional transmitting apparatus 5000 shown in FIG. 23, the transmitting apparatus 3000 shown in FIG. 1 has a configuration in which the hierarchical processing sections 5041-A to 5041-C are replaced with hierarchical processing sections 3041-A to 3041-C.

The operation of transmitting device 3000 will be described below. A plurality of TSs for the new broadcasting system output from the MPEG-2 multiplexing unit (not shown) are input to the hierarchical processing units 3041-A to 3041-C as LL signals. On the other hand, a plurality of TSs for the ISDB-T system 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 dividing unit 5031 are the same as the conventional transmitting apparatus 5000 shown in FIG. Do the same.

FIG. 2 is a diagram showing the configuration of the hierarchy processing unit 3041. As shown in FIG. Compared with the conventional hierarchical processing unit 5041 shown in FIG. and a power normalization unit 3271 are added.

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

When the LL signal is input, the energy spreader 3201 collects data contained in one or more TS packets, stores timing information in the header as information bits, and applies energy spread processing only to the information bits. A BCH encoding unit 3211 performs BCH encoding, and an LDPC encoding unit 3221 performs LDPC encoding. Bit interleaving section 3231 generally performs bit interleaving different from bit interleaving section 5231 of the ISDB-T system in FIG. 2 in order to bring out the ability of LDPC encoding. Mapping section 3241 applies, for example, NUQAM (Non-Uniform QAM) as carrier modulation in order to increase the capacity.

Power difference control section 3251 reduces the power of the carrier modulated signal (LL) output from mapping section 3241 below the power of the carrier modulated signal (UL) output from mapping section 5241 based on the LL signal power instruction signal.

Addition section 3261 adds the carrier modulation signals (UL and LL) output from mapping section 5241 and power difference control section 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 modulated signal (UL) output from the mapping unit 5241. .

In transmitting apparatus 3000 in FIG. 1, hierarchical synthesizing section 5051 and thereafter perform the same operations as conventional transmitting apparatus 5000 shown in FIG. However, as will be described later using 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. 2, the definition of the TMCC signal of the ISDB-T method is partially changed .

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

・B110: "0" indicates LDM transmission, "1" indicates no LDM transmission (ISDB-T system only). , the presence or absence of LDM transmission.

When B110 is "0", B111 to B121, which were 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: Represents the carrier modulation mapping scheme of each layer LL signal, "0" for 256 NUQAM, "1" for 1024 QAM
・B116-B117/B118-B119/B120-B121: Represents the 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 synthesizing unit 5051 and later perform the same operation as in the ISDB-T system, and by assigning control information related to LDM transmission to a bit group that was undefined in the TMCC signal of the ISDB-T system, the current broadcast Adverse effects on compatible existing receivers can be eliminated.

Further, in Non-Patent Document 2, since the UL and LL transmission RF signals are simply added, the accuracy of the added transmission signal is poor for the LDM system. On the other hand, in the first embodiment, LDM addition is not performed on the SP signal, so the LDM transmission signal has good accuracy. Therefore, both the existing receiving device compatible with the current broadcasting and the receiving device compatible with the new broadcasting system can perform transmission path estimation with high accuracy. As a result, a receiving apparatus compatible with the new broadcasting system can accurately decode the UL signal and the LL signal.

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

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

The operation of ISDB-T receiver 3300 will be described below. When an analog RF transmission signal is input from the reception antenna Rx-1 for the signal transmitted from the transmission device 5000 in FIG. 23, the tuner section 3305 selects the signal of the selected frequency channel (CH-Y). Receive and down-convert to a predetermined band. A/D converter 3308 performs A/D conversion and outputs a digital received signal. The demodulator 3311 performs OFDM demodulation, outputs the mapping data (cell) of the I/Q coordinates after equalization and the transmission path estimation value to the frequency deinterleaver 3315, and outputs the FFT output before equalization to the TMCC signal decoder. Output to 3335.

The TMCC signal decoding unit 3335 performs differential BPSK demodulation on each carrier in which the TMCC signal shown in FIG. The obtained demodulation results are decoded by majority to decode the TMCC signal. The decoded TMCC signal is output to demodulation section 3311, frequency deinterleaving section 3315, time deinterleaving section 3321, multi-layer TS reproduction section 3331, and FEC decoding section 3333. Actions are taken based on

A frequency deinterleaver 3315 converts the equalized I/Q coordinate mapping data and the transmission path estimation value output from the demodulator 3311 into frequency deinterleavers for the partial receiver, the differential modulator, and the synchronous modulator, respectively. Perform deinterleaving. A time deinterleaving section 3321 performs time deinterleaving on the output from the frequency deinterleaving section 3315 .

FIG. 5 is a diagram showing the configuration of the multi-layer TS reproducing section 3331. As shown in FIG. The multi-layer TS reproducing section 3331 includes a demapping section 3401 , a bit deinterleaving section 3411 , a depuncturing section 3421 and a TS reproducing section 3431 . Demapping section 3401 performs demapping processing based on the equalized I/Q coordinate mapping data and transmission path estimation values rearranged by frequency deinterleaving section 3315 and time deinterleaving section 3321 . A bit deinterleaving unit 3411 performs bit deinterleaving, and a depuncture unit 3421 performs depuncture processing. The TS reproducing section 3431 reproduces the TS for each layer with respect to the output of the depuncturing section 3421 .

FIG. 6 is a diagram showing the configuration of the FEC decoding unit 3333. As shown in FIG. 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 . For the output from the multi-layer TS reproducing unit 3331, 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 3471 performs RS decoding.

Through the above operation, ISDB-T receiving apparatus 3300 in FIG. 4 outputs TS of each layer of ISDB-T system that has been subjected to error correction decoding for the signal transmitted from transmitting apparatus 5000 in FIG. It should be noted that the ISDB-T receiver 3300 of FIG.

As shown in FIG. 3, the new broadcast system (LL signal) has lower power than the ISDB-T system (UL signal), ranging from 17.5 dB to 25 dB. Since the required C/N of current broadcasting by the ISDB-T system is about 20 dB, the new broadcasting system (LL signal) will be buried at a power level below the noise at the receiving point near the required C/N. Therefore, adverse effects on existing ISDB-T receivers 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 decoding of the ISDB-T method (UL signal) can be performed with high accuracy. can do well.

<Receiving device and receiving method>
FIG. 7 is a diagram showing the configuration of receiving apparatus 3500 according to Embodiment 1 of the present invention. A receiving device 3500 in FIG. 7 corresponds to the transmitting device 3000 in FIG. 1 and reflects the functions of the transmitting device 3000 . The same reference numerals are used for the same components as those of the existing ISDB-T receiver, and descriptions thereof are omitted.

Receiving apparatus 3500 has a configuration in which TMCC signal decoding section 3335 is replaced with TMCC signal decoding section 3535 in comparison with ISDB-T receiving apparatus 3300 shown in FIG. Furthermore, the configuration is obtained by adding a UL received signal reconstruction unit 3551 , a delay unit 3553 , a subtraction unit 3555 and an FEC decoding unit 3533 .

The operation of the receiving device 3500 will be described below. When an analog RF transmission signal is input from the reception antenna Rx−1 for the signal transmitted from the transmission device 3000 in FIG. A deinterleaver 3315, a time deinterleaver 3321, a multi-layer TS reproducer 3331, and an FEC decoder 3333 operate in the same manner as the ISDB-T receiver 3300 shown in FIG. The TS (UL decoded signal) of each layer of the ISDB-T system, which has been subjected to error correction decoding, is output.

Note that the TMCC signal decoding unit 3535 basically performs the same operation as the TMCC signal decoding unit 3335 in FIG. It also has a function of outputting to the composition unit 3551 and the FEC decoding unit 3533 .

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

The delay unit 3553 delays the equalized I/Q coordinate mapping data output from the time deinterleaving unit 3321 to match the timing with the output of the UL reception signal reconstruction unit 3551 . A subtraction unit 3555 subtracts the output of the UL reception signal reconstruction unit 3551 from the output of the delay unit 3553, and outputs the result as a reception signal (mapping data of I/Q coordinates after equalization) when transmitted only by LL.

FIG. 8 is a diagram showing the configuration of the FEC decoding unit 3533. As shown in FIG. The FEC decoding section 3533 is composed of a demapping section 3561 , a bit deinterleaving section 3563 , an LDPC decoding section 3565 , a BCH decoding section 3567 , an energy despreading section 3569 and a TS recovery section 3571 .

When the received signal (mapping data of I/Q coordinates after equalization) when transmitted only by LL is input from the subtraction unit 3555, the demapping unit 3561 performs demapping processing, and the bit deinterleaving unit 3563 Bit deinterleaving is performed, LDPC decoding section 3565 performs LDPC decoding, BCH decoding section 3567 performs BCH decoding, energy despreading section 3569 performs energy despreading, and TS reproducing section 3571 performs TS reproduction. With the above operation, the receiving apparatus 3500 in FIG. 7 outputs the 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 receiver 3500 in FIG. 7 may include the components other than the tuner section 3305 as an integrated circuit 3541 .

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

In addition, since the LDM system is not added to the SP signal, the receiving apparatus compatible with the new broadcasting system can accurately estimate the transmission path, and as a result, the UL signal and the LL signal can be decoded with high accuracy. can be done.

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

Transmitting apparatus 3600 in FIG. 9 differs from transmitting apparatus 3000 in Embodiment 1 shown in FIG. It has a configuration in which a normalization unit 3271 is added.

A TMCC/AC signal generator (for LL) 3691 generates a TMCC signal as control information and an AC signal as additional information for LL. The generated TMCC signal may be the same as the information shown in FIG. 3(b), or the number of configurable patterns may be increased by increasing the number of bits of each parameter (UL/LL signal power ratio, etc.). . Alternatively, the types of parameters may be increased. Power difference control section 3251, addition section 3261, and power normalization section 3271 perform the same operation as in FIG.

If the TMCC/AC signal generation unit 5091 generates at least B110 (whether there is LDM transmission) among the information shown in FIG. can. However, all or part of B110 to B121 may be generated.

Frame construction section 5101 converts the information data output from frequency interleaving section 5071, the pilot signal for synchronization reproduction output from pilot signal generation section 5081, and the TMCC signal output from power normalization section 3271 into an ISDB-T system transmission frame. configure.

Other operations are the same as those of transmitting apparatus 3000 in Embodiment 1 shown in FIG.

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

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

The signal transmitted from the transmission device 3600 in FIG. 9 is added to the TMCC by the LDM system, but the TMCC (LL signal) of the new broadcasting system is the TMCC (UL signal) of the ISDB-T system. It has relatively low power and ranges from 17.5 dB to 25 dB. Since the required C/N for TMCC of the current broadcasting by the ISDB-T system is about 10 dB, the TMCC (LL signal) of the new broadcasting system is buried at a power level below the noise at the receiving point near the required C/N. become. Therefore, adverse effects on existing ISDB-T receivers can be eliminated. Note that the range of the UL/LL signal power ratio for TMCC is not limited to 17.5 dB to 25 dB, and values smaller than this range may be included in the range.

<Receiving device and receiving method>
FIG.10 is a diagram showing the configuration of receiving apparatus 3800 according to Embodiment 2 of the present invention. The receiver 3800 in FIG. 10 corresponds to the transmitter 3600 in FIG. 9 and reflects the functions of the transmitter 3600 . The same components as those of the existing ISDB-T receiver and the receiver of Embodiment 1 are denoted by the same reference numerals, and descriptions thereof are omitted.

Receiving apparatus 3800 has UL reception TMCC signal reconstruction section 3851, delay section 3853, subtraction section 3855, and TMCC signal decoding section 3835 added, compared to receiving apparatus 3500 in Embodiment 1 shown in FIG. Configuration.

The operation of the receiving device 3800 will be described below. The UL received TMCC signal reconstruction unit 3851 uses the transmission path estimation value and the UL TMCC decoded signal output from the TMCC signal decoding unit 3535 to reconstruct the received TMCC signal (FFT before equalization) when transmitted only in the UL. output).

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

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

Other operations are the same as those of receiving apparatus 3500 in Embodiment 1 shown in FIG. It should be noted that an integrated circuit 3841 may include the components of the receiver 3800 in FIG. 10 except for the tuner section 3305 .

With the above configuration, the receiving apparatus compatible with the new broadcasting system can decode the TMCC to which the addition of the LDM system has been performed, and decode the UL signal and the LL signal.

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

Transmitting apparatus 4000 in FIG. 11 differs from transmitting apparatus 3000 in Embodiment 1 shown in FIG. This is a configuration in which a conversion unit 3271 is added.

In FIG. 11, a pilot signal generation section (for LL addition) 4081 uses a pseudo-random binary sequence different from that used by pilot signal generation section 5081 to generate a synchronization reproduction pilot signal. Power difference control section 3251, addition section 3261, and power normalization section 3271 perform the same operations as in FIG.

The frame construction unit 5101 uses the information data output from the frequency interleaving unit 5071, the pilot signal for synchronization reproduction output from the power normalization unit 3271, and the TMCC signal output from the TMCC/AC signal generation unit 5091 as an ISDB-T system. Construct a transmission frame.

Other operations are the same as those of transmitting apparatus 3000 in Embodiment 1 shown in FIG.

With the above configuration, the addition of the LDM method is also performed for pilot signals such as SP signals. As a result, since the existing ISDB-T receiver can observe the received C/N of the information data and the pilot signal at the same level, the received C/N detection value using the pilot signal is the received C/N of the information data. Equivalent level and elimination of adverse effects. On the other hand, since the pilot signal added by the LDM system is already known to the receiving apparatus compatible with the new broadcasting system, the transmission path can be estimated with high accuracy, and as a result, the UL signal and the LL signal can be decoded with high accuracy. can do well.

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

In the signal transmitted from the transmitting apparatus 4000 in FIG. 11, the addition of the LDM method is also performed to the pilot signal such as the SP signal. Since the C/N can be observed at the same level, the received C/N detected value using the pilot signal has the same level as the received C/N of the information data, and adverse effects are eliminated.

<Receiving device and receiving method>
FIG. 12 is a diagram showing the configuration of receiving apparatus 4600 according to Embodiment 3 of the present invention. A receiver 4600 in FIG. 12 corresponds to the transmitter 4000 in FIG. 11 and reflects the functions of the transmitter 4000 . The same components as those of the existing ISDB-T receiver and the receivers 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 in comparison with receiving apparatus 3500 of FIG.

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

Other operations are the same as those of receiving apparatus 3500 in Embodiment 1 shown in FIG. It should be noted that the receiver 4600 in FIG. 12 may include the components other than the tuner section 3305 as an integrated circuit 4641 .

With the above configuration, the receiving apparatus compatible with the new broadcasting system can perform OFDM demodulation using the LDM-added pilot signal as a known signal, and accurately decode the UL signal and the LL signal.

(Embodiment 4)
<Transmitting device and transmitting method>
FIG. 13 is a diagram showing the configuration of transmitting apparatus 4100 according to Embodiment 4 of the present invention. The same reference numerals are used for the same components as in the conventional transmission device and the transmission devices of Embodiments 1 to 3, and descriptions thereof are omitted.

Transmitting apparatus 4100 in FIG. 13 has a configuration in which hierarchical processing section 3041 is replaced with hierarchical processing section 4141 in comparison with transmitting apparatus 3000 in Embodiment 1 shown in FIG.

FIG. 14 is a diagram showing the configuration of the hierarchy processing unit 4141. As shown in FIG. Compared with the hierarchical processing unit 3041 in Embodiment 1 shown in FIG. 2, a selector 4145 is added.

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

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

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

Other operations are the same as those of transmitting apparatus 3000 in Embodiment 1 shown in FIG.

With the above configuration, the hierarchical processing unit can select either the signal of only the new broadcast (LL signal) according to the LDM method or the new broadcast method by the transmitting apparatus 3000 in Embodiment 1 shown in FIG. As a result, the current broadcasting (UL signal) by the ISDB-T system will be stopped several years after the application method of the LDM system is put into practical use, and only the new broadcasting (LL signal) by the new broadcasting system will be used. can be constructed.

<Existing ISDB-T receiving device and receiving method>
The operation of ISDB-T receiving apparatus 3300 in FIG. 4 for the signal transmitted from transmitting apparatus 4300 in FIG. 13 will be described only in points different from the operation for the signal transmitted from transmitting apparatus 3000 in FIG. 1 in Embodiment 1. FIG.

When B20 to B21 in the TMCC signal in the transmitting device 4300 of FIG. 13 are "10", the TMCC signal decoding unit 3335 in the ISDB-T receiving device 3300 of FIG. 4 interprets the transmission signal as undefined, Determined as unreceivable.

On the other hand, when B20 to B21="00" in the TMCC signal in the transmitting device 4300 in FIG. 13, the TMCC signal decoding unit 3335 in the ISDB-T receiving device 3300 in FIG. ISDB-T), and performs the same operation as in Embodiment 1 to output the TS of each layer of the ISDB-T system, which has been subjected to error correction decoding.

<Receiving device and receiving method>
FIG. 16 is a diagram showing the configuration of receiving apparatus 4700 according to Embodiment 4 of the present invention. A receiver 4700 in FIG. 16 corresponds to the transmitter 4100 in FIG. 13 and reflects the functions of the transmitter 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 to receiving apparatus 3500 in Embodiment 1 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 the second generation digital terrestrial television broadcasting system and outputs the selection signal “1” to the selector 4145 .

A selector 4145 selects the output of the time deinterleaver 3321 . That is, the output of the selector 4145 is the mapping data of the I/Q coordinates after equalization of the carrier modulated signal (LL) of the new broadcasting system and the transmission channel estimation value, but the power cannot be lowered by the transmission device 4100 in FIG. corresponds to the signal sent to

The FEC decoding unit 3533 performs the same operation as in FIG. 7, and outputs the TS of each layer of the new broadcasting system for which error correction decoding has been performed.

Other operations are the same as those of receiving apparatus 3500 in Embodiment 1 shown in FIG. It should be noted that the receiver 4700 of FIG. 16 may include the components other than the tuner section 3305 as an integrated circuit 4741 .

On the other hand, when B20 to B21="00" in the TMCC signal in the transmitting apparatus 4300 of FIG. ” is output. Other operations are the same as those of the receiving apparatus 3500 in Embodiment 1 shown in FIG. to output

With the above configuration, the receiving apparatus compatible with the new broadcasting system will be able to use the new broadcasting system ( LL signal), the TS (LL decoded signal) of each layer of the new broadcasting system can be output. Especially in this case, since the signal transmitted by transmitting device 4100 in FIG.

(Embodiment 5)
<Transmitting device and transmitting method>
FIG. 17 is a diagram showing the configuration of transmitting apparatus 4200 according to Embodiment 5 of the present invention. The same reference numerals are used for the same components as in the conventional transmission device and the transmission devices of Embodiments 1 to 4, and descriptions thereof are omitted.

Compared with transmitting apparatus 4100 in Embodiment 4 shown in FIG. 13, transmitting apparatus 4200 in FIG. 5091, frame configuration section 5101 and OFDM signal generation section 5111, hierarchical synthesis section 4251, time interleave section 4261, frequency interleave section 4271, pilot signal generation section 4281, TMCC/AC signal generation section 4291, frame configuration section 4301 and OFDM It is a configuration in which the signal generator 4311 is replaced with each other. 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 in the ISDB-T system (FFT size is 2k, (3 types of 4k and 8k, and GI of 1/4, 1/8, 1/16 and 1/32).

On the other hand, the operation of transmitting device 4200 when the selection signal is "1" 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 values different from those of the ISDB-T system (for example, the FFT size is 5 types of 2k, 4k, 8k, 16k, and 32k, and the GI is 1/4, 1/8, 1/16, 1/32, 1/64, and 1/128).

When the selection signal is "1", the hierarchical synthesizing unit 4251, the time interleaving unit 4261, and the frequency interleaving unit 4271 also have processing functions for two FFT sizes of 16k and 32k.

FIG. 18 shows the 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, a segment of a synchronous modulation section with an FFT size of 2k is composed of 108 carriers. On the other hand, as shown in FIG. 18, when the FFT size is 32 k, it consists of 1,728 carriers, which is 16 times. In FIG. 18, SP signals are repeatedly arranged with a period of 4 symbols and arranged with a shift of 3 carriers for each symbol in the same manner as in FIG. However, the SP signal arrangement pattern is not limited to this, and may be configured to be selected from a plurality of types. In addition, the carriers of the TMCC signal and the AC signal are arranged randomly in the frequency direction in order to reduce the influence of periodic dips in transmission line characteristics due to multipath. The number of carriers per segment of the TMCC signal and the AC signal is set to 16 times that when the FFT size is 2k, but the value is not limited to this. Thus, the pilot signal generation section 4281 and the TMCC/AC signal generation section 4291 respectively generate a synchronous reproduction pilot signal such as an SP signal and a TMCC/AC signal.

Frame construction section 4301 constructs a transmission frame from the information data output from frequency interleaving section 4271, the pilot signal for synchronization reproduction output from pilot signal generation section 4281, and the TMCC signal output from TMCC/AC signal generation section 4291. do. When the selection signal is "1", the frame construction section 4301 also has a processing function for two types of FFT sizes, 16k and 32k.

OFDM signal generation section 4311 inserts IFFT and GI (Guard Interval) into the transmission frame configuration output from frame configuration section 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, 16k and 32k, and two types of GI, 1/64 and 1/128.

Other operations are the same as those of transmitting apparatus 4100 in Embodiment 4 shown in FIG.

With the above configuration, when it is possible to select either the LDM method by the transmission device 3000 in Embodiment 1 shown in FIG. It is possible to build a system that anticipates that the current broadcasting (UL signal) by the ISDB-T system will be stopped several years after the standardization, and only the new broadcasting (LL signal) by the new broadcasting system will be used. In particular, when only the new broadcast (LL signal) according to the new broadcast system is used, it is possible to operate with the FFT size and GI values different from those of the ISDB-T system.

<Existing ISDB-T receiving device and receiving method>
The operation of ISDB-T receiving apparatus 3300 in FIG. 4 for the signal transmitted from transmitting apparatus 4200 in FIG. 17 will be described only in points different from the operation for the signal transmitted from transmitting apparatus 4100 in FIG. 13 in Embodiment 4. FIG.

When B20 to B21="10" in the TMCC signal in the transmitting device 4200 of FIG. 17, the ISDB-T receiving device 3300 detects a signal transmitted with a value (16k, 32k) different from the FFT size of the ISDB-T method. Can not do it. The ISDB-T receiving apparatus 3300 can decode the TMCC signal for the signal transmitted with the FFT size being the same value (2k, 4k, 8k) as the ISDB-T system, and determines that the reception is impossible, as in the fourth embodiment. are the same. Both are determined to be unreceivable, but the former is determined based on the impossibility of signal detection, 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 transmitting device 4300 in FIG. 13, the TMCC signal decoding unit 3335 in the ISDB-T receiving device 3300 in FIG. ISDB-T), and performs the same operation as in Embodiment 1 to output the TS of each layer of the ISDB-T system, which has been subjected to error correction decoding.

<Receiving device and receiving method>
FIG. 19 is a diagram showing the configuration of receiving apparatus 4800 according to Embodiment 5 of the present invention. A receiver 4800 in FIG. 19 corresponds to the transmitter 4200 in FIG. 17 and reflects the functions of the transmitter 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 descriptions thereof are omitted.

Receiving apparatus 4800 is different from receiving apparatus 4700 in Embodiment 4 shown in FIG. This is a configuration in which the deinterleaving section 4815, the time deinterleaving section 4821 and the TMCC signal decoding section 4835 are replaced respectively. 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 in the ISDB-T system (FFT size is 2k, (3 types of 4k and 8k, and GI of 1/4, 1/8, 1/16 and 1/32). Therefore, the receiver 4800 outputs TS (UL decoded signal) of each layer of the ISDB-T system and TS (LL decoded signal) of each layer of the new broadcasting system.

On the other hand, when the selection signal is "1", when only the new broadcasting (LL signal) by the new broadcasting system is performed, these processing units have different values from the ISDB-T system (for example, the FFT size is 2k, 4k, 8k, 16k, and 32k, and GI 6 types 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, 16k and 32k, and two types of GI, 1/64 and 1/128.

The TMCC signal decoding unit 4835 decodes the TMCC signal from the FFT output before equalization output from the demodulation unit 4811, and also has a processing function for two 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 deinterleaving section 4815 and the time deinterleaving section 4821 also have processing functions for two FFT sizes of 16k and 32k.

The rest of the operation is the same as that of receiving apparatus 4700 in Embodiment 4 shown in FIG. 16, and outputs TS of each layer of the new broadcasting system that has been subjected to error correction decoding. It should be noted that the receiver 4800 of FIG. 17 may include the components other than the tuner section 3305 as an integrated circuit 4841 .

With the above configuration, the receiving apparatus compatible with the new broadcasting system will be able to use the new broadcasting system ( LL signal), the TS (LL decoded signal) of each layer of the new broadcasting system is output. Especially in this case, since the signal transmitted by the transmitting device 4200 in FIG. It is possible to operate with a value different from that of the ISDB-T system.

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

Transmitting apparatus 4400 in FIG. 20 differs from transmitting apparatus 4100 in Embodiment 4 shown in FIG. A preamble generator 4551 and two selectors 4445-1 and 4445-2 are added, and the OFDM signal generator 5111 is replaced with the OFDM signal generator 4311, respectively. Based on whether the value of the selection signal is "0" or "1", as the output of transmission device 4400, the signal of only the new broadcast by the LDM method and the new broadcast method by transmission device 3000 in Embodiment 1 shown in FIG. Either is selected.

When the selection signal is “0”, an LDM transmission signal by transmitting apparatus 3000 in Embodiment 1 shown in FIG. 1 is selected and output from transmitting apparatus 4400 . In this case, similarly to transmitting apparatus 4100 in Embodiment 4 shown in FIG. 13, the FFT size and GI values are the same values as in the ISDB-T method (the FFT size is 3 types of 2k, 4k, and 8k, and the GI is 1/ 4, 1/8, 1/16, and 1/32).

On the other hand, the operation of transmitting device 4400 when the selection signal is "1" will be described below. In this case, values different from the ISDB-T method (for example, FFT size is 5 types of 2k, 4k, 8k, 16k, 32k, GI is 1/4, 1/8, 1/16, 1/32, 1/ 64 and 1/128). Furthermore, multiple 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 section 4461 and the frequency interleaving section 4471 perform interleaving using the subframe structure instead of interleaving using the segment structure. It also has processing functions for two FFT sizes of 16k and 32k.

FIG. 21 shows the SP signal arrangement pattern of the sixth embodiment when the selection signal is "1". As shown in FIG. 21, SP signals are repeatedly arranged with a period of 4 symbols and arranged with a shift of 3 carriers for each symbol in the same manner as in FIGS. However, the SP signal arrangement pattern is not limited to this, and may be configured to be selected from a plurality of types. Also, carriers for TMCC signals and AC signals are not provided. In this way, the pilot signal generator 4481 generates a synchronous reproduction pilot signal such as an SP signal.

Frame construction section 4501 constructs a transmission frame from the information data output from frequency interleave section 4471 and the pilot signal for synchronization reproduction output from pilot signal generation section 4481 . Frame configuration section 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 the output of the frame construction section 4501 and outputs it.

The OFDM signal generator 4311 inserts IFFT and GI into the transmission frame structure output from the selector 4445-1, 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, 16k and 32k, and two types of GI, 1/64 and 1/128.

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

When the selection signal is "1", the selector 4445-2 selects the output of the preamble generator 4551 and outputs it.

Other operations are the same as those of transmitting apparatus 4100 in Embodiment 4 shown in FIG.

With the above configuration, when it is possible to select either the LDM method by the transmission device 3000 in Embodiment 1 shown in FIG. It is possible to build a system that anticipates that the current broadcasting (UL signal) by the ISDB-T system will be stopped several years after the standardization, and only the new broadcasting (LL signal) by the new broadcasting system will be used. In particular, when only the new broadcasting (LL signal) by the new broadcasting system is used, it becomes possible to operate corresponding to values different from those of the ISDB-T system for the FFT size and GI value, It is also possible to divide it in the time direction using a structure that stores it in .

<Existing ISDB-T receiving device and receiving method>
The operation of ISDB-T receiving apparatus 3300 in FIG. 4 for the signal transmitted from transmitting apparatus 4400 in FIG. 20 will be described only in points different from the operation for the signal transmitted from transmitting apparatus 4100 in FIG. 13 in Embodiment 4. FIG.

When the selection signal is "1" in transmitting apparatus 4400 of FIG. 20, ISDB-T receiving apparatus 3300 cannot detect a signal transmitted in a time-division frame structure using preambles and subframes.

On the other hand, when the selection signal is "0" in the transmitting device 4400 in FIG. 20, the TMCC signal decoding unit 3335 in the ISDB-T receiving device 3300 in FIG. The TS of each layer of the ISDB-T system, which is interpreted and subjected to error correction decoding by performing the same operation as in Embodiment 1, is output.

<Receiving device and receiving method>
FIG.22 is a diagram showing the configuration of receiving apparatus 4900 according to Embodiment 6 of the present invention. A receiver 4900 in FIG. 22 corresponds to the transmitter 4400 in FIG. 20 and reflects the functions of the transmitter 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.

Receiving apparatus 4900 adds frequency deinterleaving section 4915, time deinterleaving section 4921, preamble detection section 4961 and selector 4945 compared to receiving apparatus 3500 in Embodiment 1 shown in FIG. 4811 is replaced.

When the selection signal is "0" in transmitting apparatus 4400 in FIG. 20, receiving apparatus 4900 in FIG. 22 performs the same operation as receiving 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 (there are three types of FFT sizes, 2k, 4k, and 8k, and the GI is 1/4, 1/8, 1/16, 1/32 4 types).

On the other hand, the operation of receiving apparatus 4900 will be described below with respect to the case where the selection signal is "1" in transmitting apparatus 4400 of FIG.

A preamble detector 4961 detects a preamble from the digital received signal of the A/D converter 3308 and outputs signaling of the new broadcasting system included in the preamble.

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

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

A selector 4945 selects and outputs the output of the time deinterleaver 4921 .

Other operations are the same as those of receiving apparatus 3500 according to Embodiment 1 shown in FIG. 7, and output TS of each layer of the new broadcasting system that has been subjected to error correction decoding. It should be noted that the receiver 4900 of FIG. 22 may include the components other than the tuner section 3305 as an integrated circuit 4941 .

With the above configuration, the receiving apparatus compatible with the new broadcasting system will be able to use the new broadcasting system ( LL signal), the TS (LL decoded signal) of each layer of the new broadcasting system is output. Especially in this case, since the signal transmitted by the transmitting device 4400 in FIG. It is possible to operate with a value different from that of the ISDB-T system. Furthermore, in this case, receiving apparatus 4900 can operate corresponding to transmission signals divided in the time direction by using a structure in which each layer is stored in a subframe.

(supplement)
The present disclosure is not limited to the contents described in Embodiments 1 to 6 above, and can be implemented in any form for achieving the purpose of the present disclosure and the purposes related or incidental thereto. may

(1) In Embodiments 1 to 6, the input to the transmission device for the new broadcasting system is TS, but it is not limited to this. .

(2) In Embodiments 1 to 5, B110 to B121 in the TMCC signal are defined as shown in FIG. 3, but the definition is not limited to this. The UL/LL signal power ratio, the carrier modulation mapping scheme of each layer LL signal, and the LDPC coding rate of each layer LL signal may differ from those in FIG.

(3) In Embodiments 4 to 6, as values different from the ISDB-T method, the FFT size is five types of 2k, 4k, 8k, 16k, and 32k, the GI is 1/4, 1/8, 1/16, Six types of 1/32, 1/64, and 1/128 are used, but this is only an example and the present invention is not limited to this.

(4) In Embodiments 1 to 6, LDM addition is performed immediately after the mapping unit, but the present invention is not limited to this. The LDM summation can be performed between the mapping unit and the OFDM signal generator.

(5) Some of Embodiments 1 to 6 may be combined with each other.

(6) The above embodiments 1-6 may relate to implementation using hardware and software. The above embodiments may be implemented or executed using a computing device (processor). A computing device or processor may be, for example, a main/general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), other programmable logic devices, etc. It can be. The above embodiments may be practiced or implemented by a combination of these devices.

(7) Embodiments 1 to 6 may be implemented by a software module scheme executed by a processor or directly by hardware. Also a combination of software modules and a hardware implementation may be possible. The software modules may be stored on various types of computer readable storage media, such as RAM, EPROM, EEPROM, flash memory, registers, hard disks, CD-ROM, DVD, etc.

A transmitting device, a transmitting method, a receiving device, a receiving method, an integrated circuit, and a program according to the present disclosure can be applied to wireless transmission systems.

3000, 3600, 4000, 4100, 4200, 4400, 5000 Transmitter 3500, 3800, 4600, 4700, 4800, 4900 Receiver 3341, 3541, 3841, 4641, 4741, 4841, 4941 Integrated circuit 3300 ISDB-T receiver 5011 TS remultiplexing unit 5021 RS encoding unit 5031 Hierarchical dividing unit 3041, 4141, 5041 Hierarchical processing unit 4251, 5051 Hierarchical synthesizing unit 4261, 4461, 5061 Time interleaving unit 3321, 4821, 4921 Time deinterleaving unit 4271, 4471, 5071 Frequency Interleaving section 3315, 4815, 4915 Frequency deinterleaving section 3081, 4281, 4481, 5081 Pilot signal generation section 4081 Pilot signal generation 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 section 3231, 5231 Bit interleaving section 3411, 3563, 3911 Bit deinterleaving section 3241, 5241 Mapping section 3401, 3561 Demapping section 3211 BCH encoding section 3567 BCH decoding section 3221 LDPC encoding section 3565 LDPC decoding section 3251 Power difference controller 3261 Adder 3271 Power normalizer 3305 Tuner 3308 A/D converter 4611, 4811 Demodulator 3331 Multi-hierarchical TS reproducer 3333, 3533 FEC decoder 3335, 3535, 3835, 4735, 4835 TMCC signal Decoding section 3421 Depuncturing section 3431, 3571 TS reproducing section 3441 Viterbi decoding section 3551 UL received signal reconstruction section 3851 UL received TMCC signal reconstruction section 3555, 3855 Subtraction section 3553, 3853 Delay section 4145, 4445, 4945 Selector 4551 Preamble generation Section 4961 Preamble Detection Section 5301 Segment Division Section 5311 Intersegment Interleaving Section 5321 Intra-segment Carrier Rotation Section 5331 Intra-segment Carrier Randomization Section

Claims (6)

A transmission device that multiplexes and transmits a plurality of data sequences including a first data sequence of a first layer and a second data sequence of a second layer 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 superimposition 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 control signal generator that generates a control signal from the control information indicating the multiplexing method;
a transmission unit that transmits the multiplexed signal and the control signal,
the control signal is transmitted by the transmission unit without being superimposed with other signals;
the control information includes information indicating that the second data sequence is multiplexed in the multiplexed signal;
The information is indicated by a flag set at a bit position of a predetermined bit array that is not used in a first communication standard and is used in a second communication standard different from the first communication standard. has been
transmitter. The transmitting device further
So that the ratio of the power of the first modulation symbol sequence to the power of the second modulation symbol sequence approaches the C/N ratio (Carrier to Noise Ratio) required for the method used to transmit the first data sequence a power difference control unit that reduces the power of the second modulation symbol sequence,
The transmitting device according to claim 1. The transmitting device further
A pilot signal corresponding to the multiplexed signal without superimposing a first pilot signal corresponding to the first data sequence and a second pilot signal corresponding to the second data sequence at a predetermined amplitude ratio. A pilot signal generator for generating
The transmitting unit further transmits the pilot signal,
3. The transmitting device according to claim 1 or 2. The control information is indicated by a bit array of a TMCC (Transmission Multiplexing Configuration Control) signal, which is the predetermined bit array,
The first communication standard is ISDB-T (ISDB-Terrestrial),
The transmission device according to any one of claims 1 to 3. The control information is information based on the first communication standard,
The transmission device according to any one of claims 1 to 4. A first modulation symbol sequence generated from a first data sequence of a first layer and a second modulation symbol sequence generated from a second data sequence of a second layer are multiplexed by superposition coding. A receiving device for receiving a transmission signal including a multiplexed signal and a control signal generated from control information indicating the multiplexing method,
a receiving unit that receives the transmission signal and obtains a reception signal;
a control information acquisition unit that acquires the control information by demodulating the received signal corresponding to the control signal;
a first demodulator that demodulates the received signal corresponding to the multiplexed signal to acquire a first data sequence based on the control information;
a mapping unit that generates the first modulation symbol sequence from the output of the first demodulation unit;
a delay unit that delays the received signal corresponding to the multiplexed signal by a predetermined time;
a subtraction unit that subtracts the component of the first modulation symbol sequence from the received signal corresponding to the multiplexed signal delayed by the delay unit;
a second demodulator that acquires a second data sequence by demodulating a received signal corresponding to the multiplexed signal from which the component of the first modulation symbol sequence has been subtracted, based on the control information;
The control signal included in the transmission signal is not superimposed with other signals,
the control information includes information indicating that the second data sequence is multiplexed in the multiplexed signal;
The information is indicated by a flag set at a bit position of a predetermined bit array which is not used in a first communication standard and is used in a second communication standard different from the first communication standard. has been
receiving device.

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