JP7029271B2 - Transmitter, receiver and chip - Google Patents

Description

The present invention relates to a transmitting device, a receiving device and a chip, and more particularly to a transmitting device, a receiving device and a chip for transmitting and receiving signals including TMCC (Transmission and Multiplexing Configuration Control).

The ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) system, which is the current terrestrial digital broadcasting system in Japan, uses OFDM (Orthogonal Frequency Division Multiplexing) as the multiplexing method, and a predetermined OFDM frame is used. TMCCs are assigned to frequency carriers to transmit frame synchronization bits and various control information. The information included in the TMCC is information that assists the demodulation and decoding operations of the receiver, such as system identification, transmission parameter switching index, emergency warning broadcast activation flag, current information, and next information (Non-Patent Document 1).

On the other hand, in the next-generation terrestrial digital broadcasting system assuming super high-definition broadcasting by terrestrial broadcasting, the introduction of various modulation methods and new transmission methods is being considered in order to expand the transmission capacity, and as a result, ISDB-T Compared to the method, it is expected that the number of transmission parameters to be transmitted by TMCC will increase dramatically.

Further, in the next-generation terrestrial digital broadcasting system (hereinafter, also referred to as the next-generation terrestrial transmission system), the FFT (Fast Fourier Transform) size used in the ISDB-T system as one of the means for expanding the transmission capacity. However, as the FFT size is expanded, the OFDM frame length and OFDM symbol length become longer, and it takes time to establish synchronization and switch channels. Therefore, the number of OFDM symbols per OFDM frame is reduced. It will be necessary to do.

Therefore, in order to secure the transmission capacity of the TMCC regardless of the FFT size, it is proposed to change the number of carriers for transmitting the TMCC based on the FTT size. For example, when the FFT size is 4K, one carrier transmits TMCC, and when the FFT size is 8K, two carriers are used as one block to transmit TMCC, and the FFT size is 16K. In the case of, it is proposed to transmit TMCC with four carriers as one block, and when the FFT size is 32K, it is proposed to transmit TMCC with eight carriers as one block. Has been done. (Patent Document 1)

JP-A-2015-70279

"Transmission method of terrestrial digital television broadcasting" standard, ARIB STD-B31, Association of Radio Industries and Businesses

However, when changing the number of carriers for transmitting TMCC information based on the FTT size, how should each TMCC signal be generated by TMCC in order to transmit valid parameter information with high quality? , The concrete method has not been established. Further, in the next-generation terrestrial digital broadcasting system, what kind of transmission parameter information should be included in TMCC has not been sufficiently studied so far.

Therefore, an object of the present invention made in view of the above problems is a transmitting device, a receiving device, and a chip capable of transmitting many useful transmission parameters by the TMCC while ensuring the noise immunity of the TMCC. The purpose is to provide.

In order to solve the above problems, the transmission device according to the present invention is a transmission device that transmits an OFDM signal containing a plurality of TMCCs in one segment, and parameter information regarding transmission parameters is input and separated into a plurality of transmission devices. A unit, a plurality of error correction coding units for error correction encoding of separated parameter information, and a bit string which is error correction encoded parameter information are combined into a predetermined number of TMCCs corresponding to the FFT size of the OFDM signal. The TMCC includes a TMCC information bit generation unit having an interleaving unit, and the TMCC combines a reference bit for differential decoding and a synchronization bit of a TMCC carrier in each group of the plurality of TMCCs divided into two groups. It is characterized by including a synchronization bit composed of 16 predetermined synchronization signal words and a TMCC information bit generated by the TMCC information bit generation unit .

Further, in the transmission device, it is desirable that the error correction coding is a difference set cyclic coding.

Further, the transmitter has an FFT size of 8K and two TMCCs per segment, an FFT size of 16K and four TMCCs per segment, or an FFT size of 32K and one. It is desirable that there are eight TMCCs per segment.

Further, it is desirable that the transmitting device includes TMCC information bits in which the 408-bit bit string, which is the error-corrected coded parameter information, is evenly distributed to the predetermined number of TMCCs .

Further, it is desirable that the transmission device includes information for identifying the mode of the transmission band in the parameter information.

Further, it is desirable that the transmitting device includes information indicating whether the uniform constellation is used or the non-uniform constellation is used in the parameter information.

Further, it is desirable that the transmitting device includes information indicating a code length and a coding rate of LDPC coding in the parameter information.

In order to solve the above problems, the chip according to the present invention is a chip mounted on a transmission device, in which parameter information related to transmission parameters is separated into a plurality of pieces, the separated parameter information is error-corrected and coded, and an error-correcting code is used. The bit string, which is the converted parameter information, is interleaved with a predetermined number of TMCCs corresponding to the FFT size of the OFDM signal to generate TMCC information bits , and further, a plurality of TMCCs are generated based on the TMCC information bits. The TMCC includes a reference bit for differential decoding, a synchronization bit in which the plurality of TMCCs are divided into two groups, and a synchronization bit of a TMCC carrier in each group is combined to form a 16-bit predetermined synchronization signal word, and the TMCC. It is characterized by including an information bit .

In order to solve the above problems, the receiving device according to the present invention is a receiving device that receives an OFDM signal containing a plurality of TMCCs in one segment, and deinterleaves the TMCC information bits contained in the plurality of received TMCCs. A deinterleaved section that divides into a plurality of bit strings, a plurality of error-correcting and decoding sections that error-correct and decode the bit string output from the deinterleaved section, and a bit string that has been error-corrected and decoded are combined to obtain parameter information related to transmission parameters. The TMCC includes a synthesis unit for generating and a parameter information generation unit having the same , and the TMCC combines a reference bit for differential decoding and a synchronization bit of a TMCC carrier in each group of the plurality of TMCCs divided into two groups16. It is characterized by including a synchronization bit constituting a predetermined synchronization signal word of the bit and the TMCC information bit .

According to the transmitter, receiver and chip of the present invention, many effective transmission parameters can be transmitted while ensuring the noise immunity of TMCC.

This is an example of OFDM segment parameters in the next-generation terrestrial transmission system. It is a block diagram of an example of the TMCC information bit generation part in this invention. This is an example of TMCC produced by the present invention. It is another example of TMCC produced by this invention. It is yet another example of TMCC produced by the present invention. It is a block diagram of an example of the parameter information generation part in this invention.

Hereinafter, embodiments of the present invention will be described.

(Embodiment 1)
FIG. 1 is an example of OFDM segment parameters in the next-generation terrestrial transmission system. As described in FIG. 1, for example, when the FFT size is 8K (8912), the number of carriers of TMCC is 2, and the number of symbols per frame is 224. When the FFT size is 16K (16384), the number of carriers of TMCC is 4, the number of symbols per frame is 112, and when the FFT size is 32K (32768), the number of carriers of TMCC is 8, and the number of symbols per frame is 8. 56 is assumed.

First, the generation of TMCC performed by the transmission device and its data structure will be described. As will be described in detail later, the TMCC includes a reference bit for differential decoding, a synchronization bit, and a TMCC information bit.

FIG. 2 shows a block diagram of an example of the TMCC information bit generation unit. The TMCC information bit generation unit 10 uses parameter information transmitted as a TMCC signal as an input signal, performs error correction coding and the like, and generates a TMCC information bit. The transmission device includes a TMCC information bit generation unit as a part of the OFDM modulation signal generation unit.

As shown in FIG. 2A, the TMCC information bit generation unit 10 includes a separation unit 11, an error correction coding unit 12, 13 and an interleaving unit 14.

The separation unit 11 receives the parameter information A ₀ to A ₂₄₃ to be transmitted to the receiving side as an input signal, and separates (divides) the parameter information A 0 to A 243. Here, the parameter information is set to 244 bits, and this is separated into two bit groups (A ₀ , A ₂ , A ₄ , ~ A ₂₄₂ , A ₁ , A ₃ , A ₅ , ~ A ₂₄₃ ) of 122 bits each. , Output to error correction coding units 12 and 13, respectively. However, the parameter information is not limited to 244 bits, and the separation method is not limited to being divided into two error correction coding units 12 and 13 alternately in the order of data. The data can be separated by any separation method (for example, the data may be divided into two bit groups (A ₀ to A ₁₂₁ , A ₁₂₂ to A ₂₄₃ ) in the center), and if necessary. It may be divided into 3 or more. The contents of the parameter information A ₀ to A ₂₄₃ will be described later.

The error correction coding units 12 and 13 perform error correction coding processing on the parameter information input from the separation unit 11. Here, two error correction coding units are provided, but the error correction coding unit may be provided according to how many divisions the above-mentioned separation unit 11 separates the parameter information. The error correction code is not limited to a specific coding method, and if the TMCC has thousands to tens of thousands of bits, a highly resistant error correction code such as LDPC (Low Density Parity Check) can be used. From the viewpoint of achieving performance with a short code length of several hundred bits, it is desirable to use a difference set cyclic code. The difference set cyclic code has advantages such as strong noise immunity and ease of decoding on the receiving side under the condition of a short code length. Here, the (204,122) code, which is a shortened version of the difference set cyclic code (273,191), is used, and the information is 122 bits and the redundancy is 82 bits. However, the error correction code is not limited to this. Each of the error correction coding units 12 and 13 outputs the encoded 204-bit bit string B to the interleaving unit 14.

The interleaving unit 14 receives the bit strings B _0,0 to B _0,203 from the error correction coding unit 12 and the bit strings B _1,0 to B _1,203 from the error correction coding unit 13, and integrates them to perform interleaving. Then, it is distributed to each TMCC1 to TMCCn as TMCC information bits. As shown in FIG. 1, the number n (number of carriers) of TMCCs to be distributed is a number determined based on the FFT size.

FIG. 2B is an example of the interleaving method. After forming a bit string 15 in which the bit strings B _0,0 to B _0,203 from the error correction coding unit 12 and the bit strings B _1,0 to B _1,203 from the error correction coding unit 13 are serially integrated, this is performed. The bit string is switched, for example, bit by bit and distributed to TMCC1 to TMCCn. The interleaving method is not limited to this, and the error-corrected bit string B may be evenly distributed to TMCC1 to TMCCn according to a predetermined rule.

In the conventional ISDB-T method, when the TMCC is transmitted by using a plurality of carriers, the same information is transmitted by the plurality of TMCC carriers. In the present invention, different information is transmitted by a plurality of TMCCs. Since the parameter information is error-corrected and encoded and interleaved by a plurality of TMCCs, the noise immunity becomes extremely high. Further, since each TMCC transmits different data, the total amount of information transmitted by the TMCC increases.

Further, the synchronization bit generation unit (not shown) generates a reference bit for differential decoding (differential demodulation) and a synchronization signal (synchronization bit) to be inserted into the TMCC signal.

As the reference bit for differential decoding, for example, one bit is generated for each TMCC carrier by a PRBS (Pseudo-random bit sequence) generation circuit. It is desirable that the TMCC is transmitted by DBPSK (Differential Binary Phase Shift Keying) modulation based on the reference bit.

The synchronization signal is composed of, for example, the following 16-bit words.
・ W0 = 0011010111101110
・ W1 = 1100101000010001
W0 and w1 of the synchronization signal are in a bit inversion relationship, and it is desirable to send w0 and w1 alternately for each frame.

The TMCC is formed by synthesizing the reference bit (differential reference) for differential decoding, the synchronization signal, and the TMCC information bit generated in this way. The following is an example of TMCC produced by the present invention.

FIG. 3 shows an example of TMCC when the FFT size is 8K. When the FFT size is 8K (8912), two TMCCs are used per segment, and the frame length thereof is, for example, 224 symbols. Since TMCC is transmitted by DBPSK modulation, one symbol corresponds to one bit.

TMCC1 and TMCC2 have 1 bit of differential reference, and 16 bits of synchronization signal have the same synchronization word. As a result of processing in the interleave portion of FIG. 2, the TMCC information bits store 204 bits of information different from each other in TMCC1 and TMCC2. A 3-bit NULL is added after the TMCC information bit.

FIG. 4 shows an example of TMCC when the FFT size is 16K. When the FFT size is 16K (16384), four TMCCs are used per segment, and the frame length thereof is, for example, 112 symbols. TMCC1 to TMCC4 are configured to have a total of 112 bits, that is, a differential reference bit of 1 bit, a synchronization bit of 8 bits, a TMCC information bit of 102 bits, and a FULL 1 bit.

TMCC1 and TMCC2 combine the 8-bit synchronization bits of the two carriers to form the above-mentioned one synchronization signal word (16 bits). Further, TMCC3 and TMCC4 combine the 8-bit synchronization bits of the two carriers to form the above-mentioned one synchronization signal word (16 bits). The 16-bit synchronization signal that combines TMCC1 and TMCC2 and the 16-bit synchronization signal that combines TMCC3 and TMCC4 are the same synchronization word.

The TMCC information bits are evenly distributed to TMCC1 to TMCC4 as a result of processing in the interleaving section of FIG. 2, and 102 different bits of information are stored in each TMCC.

FIG. 5 shows an example of TMCC when the FFT size is 32K. When the FFT size is 32K (32768), eight TMCCs are used per segment, and the frame length thereof is, for example, 56 symbols. The TMCC1 to TMCC8 are composed of a total of 56 bits, that is, a differential reference bit of 1 bit, a synchronization bit of 4 bits, and a TMCC information bit of 51 bits.

TMCC1 to TMCC4 combine the synchronization bits of 4 bits of each of the four carriers to form the above-mentioned one synchronization signal word (16 bits). Further, TMCC5 to TMCC8 combine the synchronization bits of 4 bits of each of the four carriers to form the above-mentioned one synchronization signal word (16 bits). The 16-bit synchronization signal that combines TMCC1 to TMCC4 and the 16-bit synchronization signal that combines TMCC5 to TMCC8 are the same synchronization word.

The TMCC information bits are evenly distributed to TMCC1 to TMCC8 as a result of processing in the interleave portion of FIG. 2, and 51 bits of information different from each other are stored in each TMCC.

The transmitting device generates an appropriate TMCC according to the FFT size, incorporates the TMCC into the OFDM frame, performs predetermined modulation, and transmits the TMCC to the receiving device.

Next, the parameter information transmitted by TMCC will be described. Table 1 is an example of parameter information transmitted by TMCC, and shows an example of TMCC bit allocation (overall).

In the example of Table 1, the information bits of TMCC are 244 bits of A ₀ to A ₂₄₃ , and correspond to the parameter information input to the TMCC information bit generation unit of FIG. The TMCC parameter information contained therein is composed of, for example, system identification, transmission band identification, TMCC information update flag, transmission parameter switching index, and the like, and the bit allocation thereof is as shown in Tables 2 to 7. ..

The layer A transmission parameter information and the layer B transmission parameter information have the same structure, and are composed of various types of 50-bit information shown in Table 2. As for the current information / next information, either the current information or the next information is transmitted for each OFDM frame. Hereinafter, each parameter information and its contents will be described.

Table 2 shows an example of transmission parameter information for each layer. As shown in Table 2, the transmission parameter information of each layer consists of various information such as the SISO / MIMO flag, the number of segments, the carrier modulation method, etc., and the bit allocation thereof is further shown in Tables 8 to 18. There is.

Table 3 is an example of bits indicating "system identification" corresponding to A ₀ to A ₁ of the parameter information of TMCC. In the case of the system configuration according to the specifications of the present invention, "00" is assigned. These bits allow the receiving device to identify the system.

Table 4 is an example of a bit indicating "transmission band identification" corresponding to A ₂ to A ₃ of the parameter information of TMCC.

In the current broadcasting system, one channel is composed of 13 segments, but in the next-generation terrestrial transmission system, the signal band is further divided into a large number of segments, and three modes with different transmission band structures are planned. .. That is, there are three modes: a narrow band mode using 33 segments, a compatibility mode in which an extended band of less than one segment is added on both sides of the 33 segments used in the narrow band mode, and a normal mode using 35 segments. .. Therefore, it is necessary to send the parameter information to the receiving device to identify which transmission bandwidth the transmission is performed in. In the present invention, information indicating which of the 33-segment narrow band mode, the 35-segment normal mode, and the compatible mode having the same bandwidth as the conventional mode is transmitted is transmitted in 2 bits.

According to the present invention, by transmitting a TMCC containing information for identifying a transmission band, it is possible to identify in which transmission bandwidth the receiving device is performing transmission.

Table ₅ is an example of a bit indicating “TMCC information update” corresponding to A4 of the TMCC parameter information. With this bit, it is possible to identify whether or not the TMCC information has been updated in the receiving device.

Table 6 is an example of a bit indicating a “transmission parameter switching index” corresponding to A ₅ to A ₉ of the parameter information of TMCC. With these bits, the receiving device can recognize how many frames of the current OFDM frame the transmission parameter is switched after.

Table 7 is an example of a bit indicating a “partial reception flag” corresponding to A ₉₂ of the parameter information of TMCC. In the current ISDB-T system, one of the 13 segments is used as a partially receivable segment to provide a video signal service with high noise immunity (so-called One Seg). Even in the next-generation terrestrial transmission system, it is possible to provide a service by such partial reception, and the presence or absence of partial reception can be identified in the receiving device by this bit.

Tables 8 to 18 show transmission parameter information for each layer.

First, Table 8 is an example of bits indicating the “SISO / MISO flag”. In the next-generation terrestrial transmission method, in order to expand the transmission capacity, the transition from the conventional SISO (Single-Input Single-Output) transmission method to the future MIMO (Multi-Input Multi-Output) transmission method is being considered. However, as a transitional period to the MIMO transmission method, a MISO (Multi-Input Single-Output) transmission method is assumed in which a plurality of antennas are used on the transmitting side and one antenna is used on the receiving side. Further, in MISO, space-time block coding (STBC: Space Time Block Coding) and space frequency block code (SFBC: Space Frequency Block Coding) are used. Therefore, it is necessary to send the parameter information to the receiving device to identify which transmission method is used. In the present invention, information indicating which transmission method is SISO / MISO is transmitted in 3 bits.

According to the present invention, the transmission method used in the receiving device can be identified by transmitting the TMCC including information indicating which transmission method of SISO / MISO is used.

Table 9 is an example of bits indicating the “number of segments”. In the next-generation terrestrial transmission method, as explained in the transmission band identification in Table 4, signals are transmitted using a maximum of 35 segments per channel, but in layered transmission, each layer uses how many segments each. Need to be transmitted. With these bits, the number of segments constituting each layer can be identified in the receiving device.

Table 10 is an example of a bit indicating a “carrier modulation method”. In the current ISDB-T, QPSK (Quadrature Phase Shift Keying), DQPSK (Differential QPSK), 16QAM (Quadrature Amplitude Modulation), and 64QAM are used as modulation methods, but in the next-generation terrestrial transmission method, 256QAM is further used. The use of multi-level modulation transmission methods such as 1024QAM and 4096QAM is planned. With these bits, it is possible to identify by what carrier modulation method the signal is modulated in the receiving device.

Table 11 is an example of a bit indicating “construction identification”. As described with respect to Table 10, in the next-generation terrestrial transmission method, various carrier modulation methods of QPSK to 4096QAM are used, but in addition to this, uniform constellation and non-uniform constellation are used as the constellation. Will be. Therefore, it is necessary to send the parameter information to the receiving device to identify whether the uniform constellation is used or the non-uniform constellation is used. In the present invention, information indicating which of the uniform constellation and the non-uniform constellation is transmitted is transmitted in 1 bit.

According to the present invention, the constellation used in the receiving device can be identified by transmitting a TMCC containing information indicating whether a uniform constellation is used or a non-uniform constellation is used. ..

Table 12 is an example of a bit indicating an “error correction code length”. In the next-generation terrestrial transmission system, an LDPC (Low Density Parity Check) code is introduced as an error correction code, and three code lengths are prepared as code lengths of the LDPC code. That is, Short (eg 11,220), Middle (eg 44,880), and Long (eg 269,280), as shown as internal codes in FIG. Therefore, it is necessary to send the parameter information to the receiving device to identify which code length is used. In the present invention, information indicating which of the three code lengths is used is transmitted in 2 bits. The specific code length of each is not limited to the numerical value shown in FIG.

According to the present invention, the code length of the LDPC code used in the receiving device can be identified by transmitting the TMCC containing the information indicating the code length of the LDPC coding.

Table 13 is an example of a bit indicating the “coding rate”. In the next-generation terrestrial transmission system, an LDPC code is introduced as an error correction code, and the coding rate thereof is, for example, 2/15 to 14/15 and 1/2, which are more coding than before. The rate is prepared. Therefore, it is necessary to send the parameter information to the receiving device to identify which code rate is used. In the present invention, information indicating what the coding rate is is transmitted in 4 bits. The specific numerical values of the coding rate in Table 13 and the correspondence with 4 bits are only examples.

According to the present invention, the code rate of the LDPC code used in the receiving device can be identified by transmitting the TMCC containing the information indicating the code rate of the LDPC coding.

Table 14 is an example of bits indicating the “time interleave length”. The length of the time interleave is specified by the parameter I independently for each layer as in the conventional case. There are four types of time interleave lengths. Therefore, it is necessary to send the parameter information to the receiving device to identify which time interleave length is used. In the present invention, information indicating the time interleave length is transmitted in 3 bits. With these bits, the time interleave length of the layer can be identified in the receiving device.

Table 15 is an example of a bit indicating a “data carrier boost ratio”. In the next-generation terrestrial transmission system, it is expected that the output of the data carrier will be boosted at various ratios. Therefore, it is necessary to send the parameter information to the receiving device to identify the boost ratio at which the data carrier is amplified. In the present invention, information indicating the data carrier boost ratio is transmitted in 3 bits. With these bits, the data carrier boost ratio of the layer can be identified in the receiving device.

Table 16 is an example of bits showing the “SP pattern”. In the OFDM frame, SP (Scattered Pilot) signals are arranged in various repeating patterns. The carrier spacing in the _X direction (frequency direction) after time direction interpolation is represented by DX and the symbol spacing DY in the _Y direction (symbol direction), and the SP signal is arranged in any pattern for the receiving device. It is necessary to send the parameter information to identify the presence. In the present invention, information indicating the SP pattern is transmitted in 4 bits. With these bits, the arrangement of the SP pattern can be identified in the receiving device.

Table 17 is an example of a bit indicating "pilot coding". When an OFDM modulated signal is transmitted from a plurality of transmitting antennas by the MISO method or the like, the pilot signal in the OFDM frame of each antenna is divided into the code inversion method (multiplying the coefficients +1 and -1) or the null method (coefficients +1 and 0). Differentiate by multiplication). It is necessary to send parameter information to the receiving device to identify how the pilot signal is coded (orthogonalized). In the present invention, information indicating by which method the pilot signal is encoded is transmitted in 1 bit. With this bit, the coding of the SP pattern can be identified in the receiving device.

Table 18 is an example of bits indicating "all carrier pilot flags". It is necessary to send parameter information to the receiving device to identify the presence or absence of all carrier pilots. In the present invention, information indicating the presence or absence of all carrier pilots is transmitted in 1 bit. With this bit, the presence or absence of all carrier pilots can be identified in the receiving device.

In Table 2, the head position (19 bits) of the FEC (Forward Error Correction) block included in the frame header of the frame for each layer is also transmitted by the TMCC carrier.

In the first embodiment described above, the configuration and operation of the TMCC information bit generation unit 10 in the transmission device have been described. However, the present invention is not limited to this, and the semiconductor chip mounted on the transmission device includes the TMCC information bit. It may be configured as a chip to generate. That is, it is a chip mounted on a transmission device, and parameter information related to transmission parameters is separated into a plurality of pieces, the separated parameter information is error-corrected and coded, and a bit string which is error-corrected coded parameter information is an OFDM signal. It may be configured as a chip capable of interleaving a predetermined number of TMCCs corresponding to the FFT size of the above and generating TMCC information bits.

In the chip mounted on the transmission device, the transmission parameters can be various information described in Tables 1 to 18. Further, the chip mounted on the transmitter includes a synchronization bit in which a reference bit for differential decoding, a synchronization bit of a plurality of TMCC carriers are combined to form one common synchronization signal, and a generated TMCC information bit. May be arranged to generate a TMCC of an OFDM signal.

Further, in the first embodiment described above, the configuration and operation of the TMCC information bit generation unit 10 in the transmission device have been described, but the present invention is not limited to this, and may be configured as a method for generating TMCC information bits. .. That is, according to the data flow of FIG. 2, a step of setting parameter information regarding transmission parameters to be transmitted, a step of separating the set parameter information into a plurality of pieces, and a step of error-correcting and encoding the separated parameter information, respectively. It may be configured as a method of generating TMCC information bits including a step of interleaving a bit string which is error correction coded parameter information into a predetermined number of TMCCs corresponding to the FFT size of the OFDM signal.

In the method of generating the TMCC information bit, the transmission parameters to be transmitted can be various information described in Tables 1 to 18. Further, the method of generating the TMCC information bit includes a synchronization bit in which a reference bit for differential decoding, a synchronization bit of a plurality of TMCC carriers are combined to form one common synchronization signal, and a generated TMCC information bit. It may be a method of generating a TMCC of an OFDM signal by adding a step of arranging the above.

According to the above-mentioned chip and method, it is possible to generate a plurality of different TMCC information bits, and a plurality of TMCCs can transmit different information. Further, since the parameter information is error-corrected and encoded and interleaved by a plurality of TMCCs, the noise immunity of the TMCCs becomes extremely high.

(Embodiment 2)
The generation of the TMCC performed on the transmitting device side has been described so far, but next, the receiving device as the second embodiment of the present invention, particularly the receiving device for receiving the TMCC included in the transmission signal will be described.

The receiving device performs a predetermined demodulation / decoding process on the received signal to extract the TMCC shown in FIGS. 3 to 5. From the extracted TMCC1 to TMCCn, the TMCC information bit is input to the parameter information generation unit 20, parameter information is generated, and control information necessary for reception is acquired.

FIG. 6 shows a block diagram of an example of the parameter information generation unit. The parameter information generation unit 20 uses the TMCC information bit included in the received TMCC as an input signal, performs error correction and decoding, and generates the transmitted parameter information. The receiving device includes a parameter information generation unit as a part of the OFDM demodulation / decoding unit.

As shown in FIG. 6, the parameter information generation unit 20 includes a deinterleave unit 21, an error correction decoding unit 22, 23, and a synthesis unit 24.

The deinterleave unit 21 receives TMCC information bits from each TMCC1 to TMCCn as an input signal, deinterleaves them, and restores a bit string (bit string 15 in FIG. 2B) arranged in the original data order. This is output to the error correction decoding units 22 and 23 corresponding to the processing on the receiving side. Here, the restored bit string is divided into two bit groups (B _0,0 to B _0,203 , B _1,0 to B _1,203 ) of 204 bits each, and output to the error correction decoding units 22 and 23, respectively. Although the number of bits and the division method are not limited, how many of the restored bit strings are divided is designed according to the design of the error correction coding on the transmission device side.

The error correction / decoding units 22 and 23 perform error correction / decoding processing on the bit string B input from the deinterleavement unit 21. Although two error correction / decoding units are provided here, an error correction / decoding unit may be provided corresponding to the error correction coding unit on the transmitting side. It is desirable to use a difference set cyclic code as the error correction code. Here, by performing decoding using the (204, 122) code which is a shortened code of the difference set cyclic code (273, 191), the error correction decoding unit 22 can be, for example, A ₀ , A ₂ , A. ₄ , The decoding bits (parameter information) of A ₂₄₂ are generated, and the error correction decoding unit 23 generates, for example, the decoding bits (parameter information) of A ₁ , A ₃ , A ₅ , and A ₂₄₃ . The error correction decoding units 22 and 23 output the decoded 122-bit parameter information to the synthesis unit 24, respectively.

The synthesis unit 24 synthesizes the decoding bits (parameter information) input from the error correction decoding units 22 and 23, generates the original parameter information A ₀ to A ₂₄₃ , and outputs the original parameter information A 0 to A 243.

The receiving device reads necessary control information from the output parameter information A ₀ to A ₂₄₃ and uses it for reception control.

Although the configuration and operation of the parameter information generation unit 20 in the receiving device have been described in the second embodiment, the present invention is not limited to this, and the chip may be a chip made of a semiconductor device mounted on the transmitting device. good. That is, it is a chip mounted on a receiving device that receives an OFDM signal including TMCC, and the TMCC information bits included in a plurality of received TMCCs are deinterleaved, divided into a plurality of bit strings, and the deinterleaved bit strings are deinterleaved. It may be configured as a chip that generates parameter information related to transmission parameters by error-correcting and decoding and synthesizing the error-correcting and decoded bit strings.

Further, in the second embodiment described above, the configuration and operation of the parameter information generation unit 20 in the receiving device have been described, but the present invention is not limited to this, and may be configured as a method for generating parameter information regarding transmission parameters. good. That is, according to the data flow of FIG. 6, a step of receiving an OFDM signal including TMCC, a step of extracting TMCC information bits from a plurality of received TMCCs, and a step of deinterleasing the extracted TMCC information bits to obtain a plurality of bit strings. The parameter information on the receiving side is provided with a step of dividing the divided bit strings into, a step of error-correcting and decoding each of the divided bit strings, and a step of synthesizing the error-corrected and decoded bit strings to generate parameter information related to transmission parameters. It may be configured as a method of generation.

According to the receiving device, chip, and method of the present invention, parameter information regarding transmission parameters can be generated from a plurality of different TMCCs, and many useful parameter information can be obtained. Further, since the parameter information is error-corrected and encoded and interleaved by a plurality of TMCCs, the reliability is extremely high.

Although the above embodiments have been described as typical examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and modifications can be made without departing from the scope of claims. For example, it is possible to combine the plurality of constituent blocks described in the embodiment into one, or to divide one constituent block into one.

10 TMCC information bit generation unit 11 Separation unit 12 Error correction coding unit 13 Error correction coding unit 14 Interleaving unit 15 Bit string B
20 Parameter information generation unit 21 Deinterleaved unit 22 Error correction decoding unit 23 Error correction decoding unit 24 Synthesis unit

Claims (9)

A transmitter that transmits OFDM signals containing multiple TMCCs in one segment .
Parameter information related to transmission parameters is input, and a separator that separates this into multiple parts,
Multiple error correction coding units that perform error correction coding for separated parameter information,
An interleaving unit that interleaves a bit string, which is error correction coded parameter information, into a predetermined number of TMCCs corresponding to the FFT size of the OFDM signal.
The TMCC information bit generator , which has
The TMCC includes a reference bit for differential decoding and a synchronization bit in which the plurality of TMCCs are divided into two groups and a synchronization bit of a TMCC carrier in each group is combined to form a 16-bit predetermined synchronization signal word. A transmission device including a TMCC information bit generated by a TMCC information bit generation unit. The transmission device according to claim 1, wherein the error correction coding is a difference set cyclic coding. In the transmission device according to claim 1 or 2, whether the FFT size is 8K and the number of TMCCs per segment is 2, or the FFT size is 16K and the number of TMCCs is 4 per segment, or the FFT. A transmitter having a size of 32K and having 8 TMCCs per segment. In the transmitting device according to any one of claims 1 to 3, the TMCC is a TMCC in which a 408-bit bit string which is the error correction coded parameter information is evenly distributed to the predetermined number of TMCCs. A transmitter characterized by containing information bits. The transmission device according to any one of claims 1 to 4, wherein the parameter information includes information for identifying a mode of a transmission band. In the transmitting device according to any one of claims 1 to 5, the parameter information includes information indicating whether a uniform constellation is used or a non-uniform constellation is used. Device. The transmitting device according to any one of claims 1 to 6, wherein the parameter information includes information indicating a code length and a coding rate of LDPC coding. A chip mounted on a transmitter
The parameter information related to the transmission parameter is separated into a plurality of pieces, the separated parameter information is error-corrected and coded, and the bit string which is the error-corrected coded parameter information is interleaved into a predetermined number of TMCCs corresponding to the FFT size of the OFDM signal. , Generates TMCC information bits ,
Further, a plurality of TMCCs are generated based on the TMCC information bits, and the TMCC combines a reference bit for differential decoding and a synchronization bit of a TMCC carrier in each group of the plurality of TMCCs divided into two groups16. A chip comprising a synchronization bit constituting a predetermined synchronization signal word of the bit and the TMCC information bit . A receiver that receives OFDM signals containing multiple TMCCs in one segment .
A deinterleaved section that deinterleaves the TMCC information bits contained in a plurality of received TMCCs and divides them into a plurality of bit strings.
A plurality of error-correcting and decoding units for error-correcting and decoding the bit string output from the deinterleaved unit, and
Error correction A synthesizer that synthesizes decoded bit strings to generate parameter information related to transmission parameters,
A parameter information generator , which has
The TMCC includes a reference bit for differential decoding and a synchronization bit in which the plurality of TMCCs are divided into two groups and a synchronization bit of a TMCC carrier in each group is combined to form a 16-bit predetermined synchronization signal word. A receiver comprising a TMCC information bit .

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