JP7011405B2 - Control signal decoder and receiver - Google Patents

Description

The present invention relates to a technology for next-generation terrestrial digital broadcasting of an OFDM (Orthogonal Frequency Division Multiplexing) transmission method, and in particular, a control signal encoder, a control signal decoder, a transmission device and a reception device, and a transmission system in next-generation terrestrial digital broadcasting. , As well as transmission and reception methods.

The current terrestrial digital broadcasting (ISDB-T: Integrated Services Digital Broadcasting-Terrestrial) is capable of layered transmission in which data signals of a plurality of layers having different transmission parameters are simultaneously transmitted. Transmission control information related to parameters such as the modulation method of each layer is transmitted by a TMCC (Transmission and Multiplexing Configuration Control) signal.

The TMCC signal is randomly arranged in the frequency (carrier) direction in order to reduce the influence of the periodic dip of the transmission line characteristic due to multipath, and is per segment in MODE3 in the current terrestrial digital broadcasting (ISDB-T). Four carriers are assigned as TMCC signals.

In the current terrestrial digital broadcasting (ISDB-T), the carrier amplitude value of the TMCC signal is set to 4/3 times the carrier amplitude value of the data signal in order to enhance the reception tolerance of the TMCC signal. By adopting DBPSK as the modulation method, it can be easily decoded without the need for transmission line information. Further, as the error correction code, a shortened code (184, 102) of the difference set cyclic code (273, 191) is used.

Further, since the TMCC signal is transmitted from the transmitting side by a plurality of carriers, the receiving side can reduce the required C / N and improve the reception performance by analog-adding the TMCC signals transmitted by the plurality of carriers. can.

In the current terrestrial digital broadcasting (ISDB-T), the TMCC signal can be received with a required C / N smaller than the data signal by the error correction code and the addition technique as described above (see, for example, Non-Patent Document 1). ).

On the other hand, as the transmission method of next-generation terrestrial digital broadcasting, not only the SISO (Single Input Single Output) transmission method in which a data signal is transmitted using one transmitting antenna and one receiving antenna, but also a plurality of transmitting antennas and a plurality of transmitting antennas are used. MIMO (Multiple Input Multiple Output) transmission method that transmits data signals using the receiving antenna of, and MISO (Multiple Input Single Output) method that transmits data signals using multiple transmitting antennas and one receiving antenna. The usage pattern is being considered.

In particular, a polarization MIMO transmission method in which a data signal is transmitted by two different polarizations (for example, horizontal and vertical) is known (see, for example, Non-Patent Document 2). The polarization MIMO transmission method uses an antenna that allows signals of two different polarizations (for example, horizontal and vertical) to be separated on both the transmitting side and the receiving side, and uses the two different polarizations at the same time. It is a transmission system that transmits data signals, and since the same frequency band can be used for signals of two different polarizations, the frequency utilization efficiency is excellent.

In the transmission method of next-generation terrestrial digital broadcasting, the use of a concatenated code between an LDPC code and a BCH code, which is a strong error correction code, is being studied. It is expected that reception resistance will be improved compared to broadcasting (ISDB-T).

Further, in the current terrestrial digital broadcasting (ISDB-T), an SP (Scattered Pilot) symbol is inserted into an OFDM frame as a demodulation reference signal of a data signal symbol by synchronous modulation in a predetermined arrangement pattern, and the SP symbol is used. Although there is no mechanism for transmitting using the TMCC signal with respect to the arrangement pattern, in the next-generation terrestrial digital broadcasting, it is considered to make the arrangement pattern of the SP symbol variable and transmit using the TMCC signal.

The MIMO transmission method includes a transmission format using Space Division Multiplexing (SDM), which expands the transmission capacity by assigning different data signals to multiple transmission antennas and transmitting them, and different codes from the multiple transmission antennas. There is a transmission format by spatiotemporal coding (STC: Space-Time Coding) that improves transmission endurance by transmitting the same data signal that has been converted.

We also know STC-SFN technology that uses STC when transmitting the same data signal to the receiving side between two transmitting stations when constructing a broadcasting network using a single frequency network (SFN). (See, for example, Non-Patent Document 3).

By the way, in the MIMO system, when a data signal modulated by a predetermined modulation method or a TMCC signal modulated by a DBPSK is simply transmitted from a plurality of transmission antennas without performing transmission coding, the data signal is transmitted by substantially one transmission antenna. It will be the same as that. Therefore, by applying transmission coding that facilitates demodulation / decoding on the receiving side for data signals and TMCC signals transmitted from a plurality of transmitting antennas, it is possible to obtain a diversity effect by MIMO.

Therefore, in the MIMO method, spatiotemporal coding (STC) is used as this transmission coding, and the orthogonally modulated code is transmitted from the transmitting side from a plurality of transmitting antennas, so that the receiving side receives the orthogonally modulated code. It is possible to improve the reception tolerance by estimating and synthesizing the conversion signal, but on the receiving side, it is necessary to estimate the transmission line using a known sequence such as the arrangement pattern of the SP symbol.

Therefore, a differential spatiotemporal coding method (hereinafter referred to as "differential STC (Differential Space Time coding)") that does not require transmission path estimation when transmitting data signals from a plurality of transmission antennas has been proposed. (See, for example, Non-Patent Document 4).

"Transmission method standard for terrestrial digital television broadcasting ARIB STD-B31 2.2 version", [online], revised on March 18, 2014, Association of Radio Industries and Businesses (ARIB), [June 2, 2016 Search], Internet <URL: http://www.arib.or.jp/english/html/overview/doc/2-STD-B31v2_2.pdf> Kenichi Murayama, "Next Generation Terrestrial Large Capacity Transmission Technology for Super Hi-Vision Broadcasting", NHK Science & Technical Research Laboratories R & D, No.134, July 2012 Takuya Tatsumi, "Transmission Technology for Next-Generation Digital Terrestrial Broadcasting-Examination of Pilot Patterns for STC-SDM Transmission-", Eijo Giho, vol.36, no.42, BCT2012-93, 2012, p.33- 36 Shusaku Umeda, "Study of Differential Space-Time Coding Method Using QAM Signal for Primary Modulation", Shingaku Giho, RCS2013-199, 2013.11

In the future, it is expected that the current terrestrial digital broadcasting (ISDB-T) will be replaced by next-generation terrestrial digital broadcasting. As a transmission method for next-generation terrestrial digital broadcasting, studies including a polarization MIMO transmission method are in progress. As described above, in next-generation terrestrial digital broadcasting, the use of a concatenated code between an LDPC code and a BCH code, which is a strong error correction code, is being studied, and reception resistance is achieved by the transmission diversity method (MIMO, MISO). Improvement is expected. Therefore, next-generation terrestrial digital broadcasting can be expected to have a greater improvement in reception characteristics than the current terrestrial digital broadcasting (ISDB-T), and requires a smaller required C / N than the current terrestrial digital broadcasting (ISDB-T). It is expected that the data signal will be received.

On the other hand, the TMCC signal needs to have a stronger reception tolerance than the data transmission, and the transmission characteristic of the TMCC signal becomes larger than the transmission characteristic of the data signal as the required C / N of the transmission characteristic of the data signal becomes smaller. It is necessary to have a small required C / N.

In particular, the amount of C / N deterioration during mobile reception is smaller for data transmission with a long code length, so the transmission characteristic difference (required C / N difference) between the TMCC signal and the data signal becomes smaller, and the data signal. There is a risk that the transmission performance of will not be fully exhibited. Therefore, it is desired to improve the reception characteristics of the TMCC signal, especially at the time of mobile reception.

By the way, as described above, in MIMO system, a plurality of transmissions are performed rather than simply transmitting a data signal modulated by a predetermined modulation method or a TMCC signal modulated by DBPSK from a plurality of transmission antennas without using transmission coding. Diversity effect by MIMO can be obtained by applying transmission coding to the data signal and TMCC signal transmitted from the antenna, which can be easily demolished and decoded on the receiving side.

Therefore, in the next-generation terrestrial digital broadcasting, in the transmission diversity method in which data signals are transmitted from a plurality of transmission antennas such as MIMO and MISO, the transmission of data signals is the transmission coding format of STC proposed by Alamouti. The use of transmission coding formats is being considered.

In this case, in order to estimate the quadrature-modulated coded signal related to the data signal on the receiving side, it is necessary to estimate the transmission line using a known series such as the arrangement pattern of SP symbols.

Then, in the next-generation terrestrial digital broadcasting, it is considered to make the arrangement pattern of the SP symbol variable and describe it in the transmission control information in the TMCC signal for transmission. When the data signal is demolished / decoded, the TMCC signal is used. First, after demodulation / decoding, transmission path estimation using a known sequence such as an arrangement pattern of SP symbols related to a data signal is performed.

However, when demodulating / decoding a TMCC signal, it is not possible to grasp the arrangement pattern of SP symbols related to the data signal, and as a result, it is not possible to estimate the transmission path. STC cannot be used as the coding format.

Further, even if a differential STC that does not require transmission path estimation is used as the transmission coding format for data signal transmission based on the technique disclosed in Non-Patent Document 4, TMCC signal transmission is performed. As for the transmission coding format according to the above, since it may not be possible to set the required C / N smaller than the transmission characteristic of the data signal as described above, further ingenuity is required.

Furthermore, in next-generation terrestrial digital broadcasting, it is necessary for the receiving side to identify at least which transmission method of SISO, MISO, and MIMO is used, so that the identification information of these transmission methods is contained in the TMCC signal. It is being considered to describe it in transmission control information.

In this case, it is possible to describe the identification information of the transmission method to be used in the transmission control information and change the transmission coding format of the TMCC signal for each corresponding transmission method, but it is an infrastructure platform for next-generation terrestrial digital broadcasting. Therefore, since the problems may increase, it is required to devise at least to maintain compatibility with respect to the transmission of TMCC signals in the transmission methods of SISO, MISO, and MIMO.

Further, when constructing a broadcasting network by SFN, in the current terrestrial digital broadcasting (ISDB-T), the same data signal is transmitted from two transmission stations (first transmission station and second transmission station), so that the receiving side In some cases, data signals from two transmission stations are superimposed and received. In this case, it is assumed that carriers with a reduced amplitude of the data signals are generated by reverse phase synthesis and the reception performance is deteriorated. Therefore, this problem can be alleviated by using STC for the same data signal transmitted from two transmission stations as in the STC-SFN technology. However, as described above, for the transmission coding format related to the transmission of the TMCC signal, STC cannot be used as the transmission coding format in the same way as the transmission of the data signal for the same reason as described above, and the data. It may not be possible to have a required C / N that is smaller than the transmission characteristics of the signal.

These problems are not limited to the case of the TMCC signal indicating the transmission control information, but are the same in the case of the AC (Auxiliary Channel) signal indicating the additional information related to the transmission of the data signal.

Therefore, regarding the control signal of the TMCC signal or AC signal in the next-generation terrestrial digital broadcasting, the required C is smaller than the transmission characteristic of the data signal, considering at least the transmission method of SISO, MISO, and MIMO, and the broadcasting network by SFN. A transmission technique for a control signal of / N is desired.

In view of the above problems, an object of the present invention is a control signal encoder and a control signal in next-generation terrestrial digital broadcasting, which enable transmission of a control signal having a required C / N smaller than the transmission characteristic of a data signal. Provided are a decoder, a transmitting device and a receiving device, a transmitting system, and a transmitting method and a receiving method.

Further, the control signal decoder of the present invention is a control signal decoder that decodes a control signal that has undergone differential spatiotemporal coding processing as a coded signal in a receiving device that receives an OFDM signal, and is the OFDM signal. Corresponding to the differential spatiotemporal coding process based on the carrier extraction means for extracting the carrier of the control signal subjected to the differential spatiotemporal coding process from the signal and the carrier symbol of the extracted control signal. The differential spatiotemporal decoding processing means includes a differential spatiotemporal decoding processing means for performing the differential spatiotemporal decoding processing, and the differential spatiotemporal decoding processing means decodes two different coded signals by the differential spatiotemporal coding processing. Further, it is characterized by further comprising a synthesis means for diversity-synthesizing two different coded signals decoded by the differential spatio-temporal decoding processing means .

Further, in the control signal decoder of the present invention, the differential spatiotemporal decoding processing means is characterized in that a decoding process corresponding to the differential spatiotemporal coding process that does not require transmission path estimation is performed.

Further, in the control signal decoder of the present invention, the carrier addition means for adding a plurality of carriers of the control signal extracted by the carrier extraction means, or the signal after the differential spatiotemporal decoding process corresponding to the plurality of carriers. It is further provided with an LLR adding means for adding based on a logarithmic likelihood ratio.

Further, the receiving device of the present invention is data that demodulates and decodes a data signal based on the control signal decoder of the present invention and the transmission control information stored in the control signal decoded by the control signal decoder. It is characterized by comprising a signal processing means.

Further, in the receiving device of the present invention, the transmission control information is used by any transmission method of hierarchical information for constituting an OFDM frame, carrier information of a data signal, and decoding control information, at least SISO, MISO, and MIMO. The data signal processing means identifies the transmission method based on the identification information, and performs demodulation and decoding processing of the data signal, including identification information of the transmission method for causing the receiving side to identify whether or not the data signal is transmitted. It is characterized by.

According to the present invention, it is possible to transmit a control signal having a required C / N smaller than the transmission characteristic of a data signal for a control signal of a TMCC signal or an AC signal in next-generation terrestrial digital broadcasting.

In particular, according to the present invention, it is possible to transmit TMCC signals in a compatible coded transmission format, at least in the transmission methods of SISO, MISO, and MIMO.

According to the present invention, in the SISO transmission method in next-generation terrestrial digital broadcasting, the reception characteristics are deteriorated as compared with the reception characteristics of the TMCC signal in the current terrestrial digital broadcasting that does not use spatiotemporal coding (STC). Even in a MISO transmission method with a single receiving antenna, the TMCC signal is transmitted using spatiotemporal coding (STC), so compatibility with various transmission methods regarding the TMCC signal can be maintained.

In particular, according to the present invention, in the MIMO transmission method in next-generation terrestrial digital broadcasting, the reception resistance of the TMCC signal can be improved by analog-adding and synthesizing the TMCC signal extracted by the carrier via each receiving antenna. ..

Since the MIMO transmission method in the next-generation terrestrial digital broadcasting can be expected to have a transmission diversity effect, it is possible to improve the reception characteristics of TMCC signals and data signals at the time of mobile reception or in a multipath environment.

That is, in the MIMO transmission method in next-generation terrestrial digital broadcasting, the TMCC signal is transmitted using a differential STC that does not require transmission path estimation on the transmitting side, and when the receiving side receives the TMCC signal using a plurality of receiving antennas. An excellent transmission diversity effect can be obtained by demodulating and synthesizing while eliminating the need for transmission path estimation.

Further, according to the present invention, the TMCC signal can be transmitted to the broadcasting network by SFN by using the coding format as the differential STC, and particularly in the broadcasting stations of the two stations constructing the SFN, the same bias can be obtained. Since it is possible to transmit separate TMCC signals between waves, the influence of reverse phase synthesis can be avoided and a diversity reception effect can be expected.

It is a block diagram which shows the schematic structure of the transmission apparatus in the transmission system of 1st Embodiment by this invention. It is a block diagram around the differential STC coding part of the control signal encoder of one Example in the transmission system of 1st Embodiment by this invention. It is a block diagram which shows the schematic structure of the receiving apparatus in the transmission system of 1st Embodiment by this invention. It is a block diagram around the differential STC decoding part of the control signal decoder of one Example in the transmission system of 1st Embodiment by this invention. It is a block diagram which shows the schematic structure of the transmission device in the transmission system of 2nd Embodiment by this invention. It is a block diagram which shows the schematic structure of the receiving apparatus in the transmission system of 2nd Embodiment by this invention. (A) and (b) are block diagrams showing a schematic configuration of a transmission device in the transmission system of the third embodiment according to the present invention, respectively. (A) and (b) are block diagrams showing a schematic configuration of a transmission device in the transmission system of the fourth embodiment according to the present invention, respectively.

Hereinafter, the transmission system of each embodiment according to the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a transmission device 10A in the transmission system of the first embodiment according to the present invention. Further, FIG. 2 is a block diagram around the differential STC coding unit 153 of the control signal encoder 15 according to the first embodiment of the transmission system according to the present invention.

(Transmitter)
The transmission device 10A shown in FIG. 1 illustrates a schematic configuration of a transmission device in next-generation terrestrial digital broadcasting that can be used as a transmission method of MISO and MIMO, but in the following description, a polarization MIMO transmission method is mainly used as an example. Explain to.

The transmission device 10A includes an error correction coding unit 11, a carrier modulation unit 12, an STC coding unit 13, a control signal generation unit 14, a control signal encoder 15, OFDM frame components 16a and 16b, and an inverse Fourier transform (IFFT). The portions 17a and 17b and the guard interval (GI) addition portions 18a and 18b are provided.

The error correction coding unit 11 inputs digital format data such as video and audio, applies a concatenated code of an LDPC code and a BCH code, and outputs the data to the carrier modulation unit 12. In this example, the LDPC code and the BCH code are assumed as the error correction coding process by the error correction coding unit 11, but other error correction codes may be used.

The carrier modulation unit 12 performs carrier modulation such as QPSK (Quadrature Phase Shift Keying) or 64QAM (quadrature amplitude modulation) on the error-correction-encoded data, and outputs the data to the STC coding unit 13.

The STC coding unit 13 performs spatio-temporal coding (STC) processing with a block code as proposed by Alamouti on the data signal (data symbol) after carrier modulation, and the same data signal encoded by STC. Is output to OFDM frame components 16a and 16b, respectively. In this example, an example in which the transmission coding process by STC is used for the transmission of the data signal will be described, but a transmission coding process such as SDM (Space Division Multiplexing) may be used.

The control signal generation unit 14 is a functional unit that generates a TMCC signal, and outputs the generated TMCC signal to the control signal encoder 15.

Transmission control information is stored in the TMCC signal. The transmission control information of this example includes hierarchical information for forming an OFDM frame, carrier information (SP information and modulation method information) of a data signal related to the carrier modulation unit 12, and decoding control information, at least SISO, MISO, and Includes transmission method identification information for the receiving side to identify which transmission method of MIMO is used. In the next-generation terrestrial digital broadcasting, since various types of carrier modulation are assumed as the amplitude / phase modulation method, the arrangement pattern of SP symbols is variable. Therefore, the SP information indicates the information of the arrangement pattern of the SP symbol to be variable, and the decoding control information includes the coding rate information and the LLR information corresponding to the error correction coding process by the error correction coding unit 11. ..

Although not shown, the control signal generation unit 14 and the control signal encoder 15 for generating and transmitting the AC signal also have the control signal generation unit 14 and the control signal coding for generating and transmitting the TMCC signal. It is installed side by side in the same manner as the vessel 15. The AC signal is different from the TMCC signal in that additional information related to the transmission of the data signal is stored, but the basic data configuration and the number of symbols are the same, and the TMCC signal and the AC signal are generated and generated respectively. With respect to transmission, the control signal encoder 15 having the same processing configuration can be used.

The control signal encoder 15 includes an error correction coding unit 151, a carrier modulation unit 152, and a differential STC coding unit 153.

The error correction coding unit 151 performs an error correction coding process by a difference set cyclic coding process on the TMCC signal generated by the control signal generation unit 14, and outputs the TMCC signal to the carrier modulation section 152. In this example, an example in which the difference set cyclic coding process is used for the error correction coding process of the TMCC signal will be described, but the LDPC code, the BCH code, or the concatenated code by two or more error correction coding processes may be used. , Other error correction coding processing may be performed.

The carrier modulation unit 152 performs carrier modulation such as DBPSK on the TMCC signal that has undergone error correction coding processing, and outputs the TMCC signal to the differential STC coding unit 153.

The differential STC coding unit 153 performs differential spatiotemporal coding (differential STC) processing on the carrier-modulated TMCC signal, which does not require transmission path estimation, and has two different systems (illustrated) as described later. The coded signals of 15a and 15b) are generated and output to the OFDM frame components 16a and 16b, respectively.

The OFDM frame component units 16a and 16b, the inverse Fourier transform (IFFT) units 17a and 17b, and the guard interval (GI) addition units 18a and 18b each transmit an OFDM frame signal (OFDM signal) via the first transmission antenna Tx1. It is configured as a first signal system for transmission and a second signal system for transmitting an OFDM frame signal (OFDM signal) via a second transmission antenna Tx2. The actual transmission device 10A includes processing such as interleaving for each signal system, but is omitted here.

The OFDM frame components 16a and 16b form an OFDM frame for the first signal system and the second signal system for the data signal symbol together with the SP symbol and the TMCC signal symbol to which the differential STC is applied, respectively, and vice versa. It is output to the Fourier transform (IFFT) units 17a and 17b, respectively. Here, an example in which the data has one layer is shown, but when performing layered transmission, the same processing is performed for the number of layers.

The inverse Fourier transform (IFFT) units 17a and 17b perform inverse Fourier transform processing on the signals of the OFDM frames for the first signal system and the second signal system, respectively, to perform OFDM modulation processing, and perform guard interval (GI). Output to the additional parts 18a and 18b, respectively.

The guard interval (GI) addition units 18a and 18b generate an OFDM signal by adding a guard interval to the signal of the OFDM frame subjected to the inverse Fourier transform processing for the first signal system and the second signal system, respectively. , Receiving to the outside via the first transmitting antenna Tx1 and the second transmitting antenna Tx2, respectively. In the polarization MIMO transmission method, data signals can be transmitted by two different polarizations (for example, horizontal and vertical). For example, the first transmitting antenna Tx1 is horizontally polarized and the second transmitting antenna Tx2 is vertically polarized. Can be used to transmit the OFDM signals of each signal system.

(Control signal encoder)
As described above, the control signal encoder 15 includes an error correction coding unit 151, a carrier modulation unit 152, and a differential STC coding unit 153, and the error correction coding unit 151 is provided by the control signal generation unit 14. The generated TMCC signal is subjected to error correction coding processing by difference set cyclic coding processing, and the carrier modulation unit 152 performs carrier modulation and outputs the carrier modulation to the differential STC coding unit 153.

Here, referring to FIG. 2, as a transmission coding process by the differential STC coding unit 153 in the control signal encoder 15, a differential spatiotemporal coding (differential STC) process that does not require transmission path estimation is performed. Will be described in more detail.

FIG. 2 is a block diagram around the differential STC coding unit 153 of the control signal encoder 15 according to the first embodiment of the transmission system according to the present invention. The differential STC coding unit 153 includes a differential symbol generation unit 1531, a delay unit 1532, and an STC coding unit 1533. Further, the equation (1) shows a transformation matrix obtained by coding processing of differential spatiotemporal coding (differential STC) that does not require transmission path estimation.

However, S _{i and k} represent symbols (original symbols) of the TMCC signal subjected to carrier modulation by the carrier modulation unit 152, and U _{i and k} represent differential symbols. The subscript i indicates the block number to be processed, the subscript k indicates two types of signals, and * indicates the complex conjugate. From the equation (1), the differential STC coding unit 153 performs differential coding on the block of the differential symbol of the i-th block by using the block of the differential symbol of the i-1 block. When each block to be processed is represented by (), the differential symbol generation unit 1531 is used for each of the two symbols (Si, 1S _{i , 2} ) of the TMCC signal carrier-modulated by the carrier modulation unit 152. , Is converted into a block of one differential symbol (U _{i, 1} U _{i, 2} ) based on the equation (1). That is, a block of one differential symbol (U _{i, 1} U _{i, 2} ) is generated between the two original symbols.

Here, (U _i-1 , 1 U _{i-1, 2} ) indicates a block of the previous differential symbol delayed by the delay unit 1532. Therefore, the differential symbol block (U _{i, 1} U _{i, 2} ) is generated every two consecutive symbols of the TMCC signal to become one STC-coded transmission code signal.

The differential symbol blocks (U _{i, 1} U _{i, 2} ) generated by the differential symbol generation unit 1531 are coded by the STC coding unit 1533 by the STC coding unit 1533, and are coded by two different systems of coded signals. Generated as (U _{i, 1} U _{i, 2} ) and (-U ^* _{i, 2} U ^* _{i, 1} ). See Non-Patent Document 4 for further details regarding the generation of these two different systems of coded signals.

In this way, the differential STC coding unit 153 generates coded signals related to TMCC signals of two different systems (15a and 15b in the figure) and outputs them to the OFDM frame component units 16a and 16b, respectively.

Therefore, since the TMCC signals are used as two coded signals having different TMCC signals to form OFDM frames for the first signal system and the second signal system, a transmission diversity effect is expected, and reception tolerance on the receiving side is expected. Improvement is possible.

(Receiver)
Next, the receiving device 20A will be described with reference to FIG. FIG. 3 is a block diagram showing a schematic configuration of the receiving device 20A in the transmission system of the first embodiment according to the present invention.

The receiving device 20A shown in FIG. 3 illustrates a schematic configuration of a receiving device in next-generation terrestrial digital broadcasting that can be used as a transmission method of MIMO, and is a case where MIMO with two receiving antennas is assumed. Here, in particular, the receiving device 20A has different two polarizations (horizontal polarization, vertical) transmitted from the two transmitting antennas (first transmitting antenna Tx1 and second transmitting antenna Tx2) of the transmitting device 10A shown in FIG. A polarization MIMO transmission method for receiving an OFDM signal of polarization) will be described as an example. It should be noted that the receiving antenna can be configured as a single receiving device of the MISO transmission method. The MISO transmission method can also be realized by configuring a signal system of only one of the two receiving antennas (first receiving antenna Rx1 and second receiving antenna Rx2) shown in FIG.

The receiving device 20A includes guard interval (GI) removing units 21a and 21b, Fourier transform (FFT) units 22a and 22b, data signal carrier extraction unit 23, transmission path estimation unit 24, STC decoding unit 25, and error correction decoding unit 26. And a control signal decoder 27.

The guard interval (GI) removing units 21a and 21b have different two polarizations (horizontal polarization and vertical polarization) individually received by the two receiving antennas (first receiving antenna Rx1 and second receiving antenna Rx2). For the OFDM signal, the guard interval is removed and output to the Fourier transform (FFT) units 22a and 22b, respectively. The guard interval (GI) removal units 21a and 21b and the Fourier transform (FFT) units 22a and 22b respectively have a first signal system for processing an OFDM signal received via the first reception antenna Rx1 and a second reception antenna Rx2. It is configured as a second signal system that processes the OFDM signal received via.

The Fourier transform (FFT) units 22a and 22b perform Fourier transform processing on the OFDM signals of the first signal system and the second signal system from which the guard intervals have been removed, respectively, to perform OFDM demodulation processing, and perform OFDM demodulation processing, respectively, and perform OFDM demodulation processing, and data signal carrier extraction unit. It is output to 23 and the control signal decoder 27.

Here, prior to the carrier demodulation / decoding process of the data signal, the carrier demodulation / decoding process of the TMCC signal is performed by the control signal decoder 27.

As described above, transmission control information is stored in the TMCC signal, layered information for forming an OFDM frame, carrier information (SP information and modulation method information) of a data signal related to the carrier modulation unit 12, and decoding control information. , At least includes transmission method identification information for allowing the receiving side to identify which of the SISO, MISO, and MIMO transmission methods is used. Then, the SP information indicates information on the arrangement pattern of the SP symbols to be variable.

Although not shown, when the AC signal is demodulated / decoded, the control signal decoder 27 for that purpose is also arranged in parallel like the control signal decoder 27 for demodulating / decoding the TMCC signal. To. The AC signal is different from the TMCC signal in that additional information related to the transmission of the data signal is stored, but the basic data configuration and the number of symbols are the same, and the demodulation / demodulation of the TMCC signal and the AC signal are performed. Regarding decoding, a control signal decoder 27 having a similar processing configuration can be used.

The control signal decoder 27 includes a control signal carrier extraction unit 271a, 271b, a differential STC decoding unit 272a, 272b, a synthesis unit 273, and an error correction decoding unit 274.

The control signal carrier extraction units 271a and 271b are functional units that extract control signal carriers in response to modulation processing (DBPSK in this example) on the transmitting side, and are subjected to the above-mentioned Fourier transform (FFT) units 22a and 22b. The carriers of the TMCC signals are extracted from the OFDM signals of the first signal system and the second signal system, which have been subjected to the Fourier transform processing, respectively, and the obtained TMCC signal symbols are subjected to differential STC coding processing. The transform signal is output to the differential STC decoding units 272a and 272b.

That is, the OFDM signals of the first signal system and the second signal system include a coded signal obtained by STC coding of the data signals of the two signal systems and a code obtained by differential STC coding of the TMCC signal of the two signal systems. Since the signal carriers are carried, the control signal carrier extraction units 271a and 271b extract and demodulate the carriers of the TMCC signals of the respective signal systems (27a and 27b in the figure), and the obtained coded signals are differential STCs. Output to the decoding units 272a and 272b, respectively.

The coded signal to which the differential STC coding process has been applied to the symbols of the TMCC signal is blocked every two symbols by the differential STC coding unit 153 on the transmitting side. Therefore, the differential STC decoding units 272a and 272b perform differential STC decoding processing for the coded signals related to the TMCC signals extracted by the control signal carrier extraction units 271a and 271b in their respective signal systems in block units. ..

Here, the decoding process of the differential STC by the differential STC decoding units 272a and 272b will be described with reference to FIG. FIG. 4 is a block diagram around the differential STC decoding units 272a and 272b of the control signal decoder 27 according to the first embodiment of the transmission system according to the present invention. Further, the equation (2) shows a transformation matrix by decoding processing of differential spatiotemporal coding (differential STC) which does not require transmission path estimation.

First, the differential STC decoding unit 272a receives the control signal symbol (more accurately, the TMCC signal symbol) of the first signal system (FIG. 27a) via the receiving antenna Rx1 from the control signal carrier extraction unit 271a. The coded signal subjected to the coding process of) is input. At the same time, the differential STC decoding unit 272b receives the control signal symbol of the second signal system (FIG. 27b) via the receiving antenna Rx2 from the control signal carrier extraction unit 271b (more accurately, the differential STC for the TMCC signal symbol). The coded signal subjected to the coding process of) is input.

The differential STC decoding units 272a and 272b are each composed of the same component, and the differential STC decoding unit 272a includes an STC decoding unit 2721a and a delay unit 2722a. Further, the differential STC decoding unit 272b includes an STC decoding unit 2721b and a delay unit 2722b.

The delay units 2722a and 2722b are configured as delay buffers that temporarily store the coded signal of the TMCC signal one block before and delay the block to be processed (current block) by one block.

The STC decoding units 2721a and 2722b use the coded signal of the TMCC signal over two blocks of the immediately preceding block obtained from the corresponding delay units 2722a and 2722b and the current block obtained from the control signal carrier extraction units 271a and 271b, respectively. Performs STC decoding processing.

More specifically, the coded signal of the current block input to the STC decoding unit 2721a is (ri _{, 1} ri _{, 2} ), and the coded signal of the immediately preceding block also input to the STC decoding unit 2721a is (ri, 1 ri, 2). If r _i-1,1 r _i-1,2 ), the STC decoding unit 2721a performs the decoding process of the differential STC using the conversion matrix of the equation (2), so that each of the transmissions is transmitted from the transmitting side. A restored symbol (S'i, 1 S'i, 2) corresponding to the symbol of the TMCC signal ((S i _{, 1} S _{i, 2 )} of the equation (1)) can be obtained.

The STC decoding unit 2721b is also processed in the same manner as the STC decoding unit 2721a. Please refer to Non-Patent Document 4 for further details regarding the decoding of the two different coded signals.

Therefore, each of the differential STC decoding units 272a and 272b is a TMCC signal transmitted from the transmitting side based on two coded signals (ri _{, 1} ri _{, 2} ) having different current blocks. The restoration symbol (S'i, 1 S'i, 2) corresponding to the symbol ((S i _{, 1} S _{i, 2 )} of the equation (1)) is generated, that is, the symbol of the TMCC signal for 4 symbols is generated. It is obtained and output to the synthesis unit 273.

The synthesizing unit 273 synthesizes the restored symbols (S'i, ₁ S'i _{, 2} ) obtained from each of the differential STC decoding units 272a and 272b, and the symbol (formula) of each TMCC signal transmitted from the transmitting side. (S _{i, 1} S _{i, 2} )) of (1) is restored, carrier demodulated, and output to the error correction decoding unit 274. As described above, regarding the reception of the TMCC signal, it is possible to obtain the diversity effect based on the MIMO transmission method while eliminating the need for transmission path estimation.

Although not shown, since the TMCC signal transmits the same information by a plurality of carriers, the control signal decoder 27 on the receiving side can improve the reception characteristics by carrier addition or LLR addition. .. For example, in the example shown in FIG. 3, the control signal carrier extraction units 271a and 271b can be used to add carriers to the TMCC signal after carrier extraction. Alternatively, the differential STC decoding units 272a and 272b may be used to perform LLR addition based on the log-likelihood ratio after the differential STC decoding process. This is not limited to the MIMO transmission method, but the same applies to the SISO and MISO transmission methods.

The error correction / decoding unit 274 performs an error correction / decoding process corresponding to the error correction coding process of the error correction coding unit 151 on the transmission side to the TMCC signal obtained from the synthesis unit 273, and the control signal generation unit on the transmission side. The TMCC signal generated by 14 is restored, and the demodulation / decoding process of the data signal after the data signal carrier extraction unit 23 described below is executed based on the transmission control information stored in the TMCC signal.

Referring to FIG. 3, the data signal carrier extraction unit 23 includes a first data signal carrier extraction unit 23a and a second data carrier extraction unit 23b.

The first data signal carrier extraction unit 23a is the data signal of the first signal system obtained via the first receiving antenna Rx1 based on the transmission control information (SP information and modulation method information) obtained by the decoding process of the TMCC signal. The carrier is extracted and output to the transmission line estimation unit 24.

The second data signal carrier extraction unit 23b is the data signal of the second signal system obtained via the second receiving antenna Rx2 based on the transmission control information (SP information and modulation method information) obtained by the decoding process of the TMCC signal. The carrier is extracted and output to the transmission line estimation unit 24.

The transmission line estimation unit 24 transmits the carrier of the data signal of each signal system obtained from the data signal carrier extraction unit 23 based on the transmission control information (SP information and modulation method information) obtained by the decoding process of the TMCC signal. The path estimation process is performed, the carriers of both data signals are equalized, and the carriers are output to the STC decoding unit 25.

The STC decoding unit 25 performs STC decoding processing corresponding to the STC coding unit 13 on the transmitting side to the carriers of the data signals of each signal system after the equalization processing, and outputs the data to the error correction decoding unit 26.

The error correction decoding unit 26 decodes the data signal after the STC decoding process based on the transmission control information (decoding control information) obtained by the TMCC signal decoding process, corresponding to the error correction coding unit 11 on the transmitting side. Processing is performed, and the data transmitted from the transmitting side is restored and output to the outside.

As described above, according to the transmission device 10A and the reception device 20A of the first embodiment, and the control signal encoder 15 and the control signal decoder 27, the MIMO transmission method is assumed to be applied to the next-generation terrestrial digital broadcasting. Alternatively, a MISO transmission method can be constructed, and in particular, for a control signal of a TMCC signal or an AC signal, it is possible to transmit a control signal having a required C / N smaller than the transmission characteristic of the data signal.

In particular, in the MIMO transmission method, the reception resistance of the TMCC signal can be improved by analog-adding and synthesizing the TMCC signal extracted by the carrier via each receiving antenna. Therefore, even when the data signal is received, the carrier information and the decoding control information of the data signal can be acquired from the transmission control information decoded for the TMCC signal having improved reception resistance, which is superior to the SISO and MISO transmission methods. The reception performance can be realized.

Further, in the MIMO transmission method, since the transmission diversity effect can be expected, it is possible to improve the reception characteristics of the TMCC signal and the data signal at the time of mobile reception or in a multipath environment. That is, as described above, the TMCC signal is transmitted using a differential STC that does not require transmission line estimation on the transmitting side, and the transmission line estimation is not required when receiving the TMCC signal using a plurality of receiving antennas on the receiving side. By demodulating and synthesizing, an excellent transmission diversity effect can be obtained.

[Second Embodiment]
Next, the transmission system of the second embodiment according to the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a block diagram showing a schematic configuration of a transmission device 10B in the transmission system of the second embodiment according to the present invention. Further, FIG. 6 is a block diagram showing a schematic configuration of the receiving device 20B in the transmission system of the second embodiment according to the present invention. The transmission system of the second embodiment shown in FIGS. 5 and 6 is a transmission device and a reception device in next-generation terrestrial digital broadcasting that can be used in the transmission method of SISO with one transmission antenna Tx and one reception antenna Rx. The schematic configuration of is illustrated. The same reference numbers are assigned to the components similar to those in the first embodiment.

(Transmitter)
The transmission device 10B shown in FIG. 5 includes an error correction coding unit 11, a carrier modulation unit 12, a control signal generation unit 14, a control signal encoder 15, an inverse Fourier transform (IFF) unit 17, and a guard interval (GI) addition. A unit 18 is provided. Compared to the MIMO (or MISO) transmission type transmitter 10A shown in FIG. 1, the transmitter 10B shown in FIG. 5 does not include the OFDM frame constituents 16a and 16b, and thus the STC coding unit relating to the data signal. 13 is also unnecessary, and the difference is that the inverse Fourier transform (IFFT) unit 17 and the guard interval (GI) addition unit 18 are used as one signal system, but the operation of each component included in the transmission device 10B is different. It is the same as that shown in FIG.

On the other hand, the control signal encoder 15 included in the transmission device 10B has an error correction coding unit 151, a carrier modulation unit 152, and a differential STC, similarly to the MIMO (or MISO) transmission type transmission device 10A shown in FIG. Since it is configured to include the coding unit 153 and can preferably have the same configuration, it can be shared by the transmission methods of MIMO, MISO, and SISO.

That is, in the SISO transmission method, the control signal encoder 15 included in the transmission device 10B transmits only one system of the coded signal related to the TMCC signal encoded by the differential STC coding unit 153. (Fig. 15a), the rest of the system is not output (Fig. 15b).

In particular, regarding the control signal generation unit 14 included in the transmission device 10B, the transmission control information stored in the TMCC signal generated by the control signal generation unit 14 is related to the layer information for forming the OFDM frame and the carrier modulation unit 12. Carrier information (SP information and modulation method information) of the data signal, decoding control information, and identification information of the transmission method for causing the receiving side to identify at least which transmission method of SISO, MISO, and MIMO is used. By configuring to include, it is possible to have compatibility in the transmission methods of MIMO, MISO, and SISO.

(Receiver)
The receiving device 20B shown in FIG. 6 includes a guard interval (GI) removing unit 21, a Fourier transform (FFT) unit 22, a data signal carrier extraction unit 23, a transmission path estimation unit 24, an error correction decoding unit 26, and a control signal decoder. 27 is provided.

The receiver 20B shown in FIG. 6 has a guard interval (GI) removal unit 21, a Fourier transform (FFT) unit 22, and a data signal carrier extraction unit 23, as compared with the MIMO transmission type receiver 20A shown in FIG. The difference is that the transmission device 10B shown in FIG. 5 does not require the STC coding unit 13 for the data signal as one signal system, and therefore the STC decoding unit 25 as shown in FIG. 3 is also unnecessary. The operation of each component included in the receiving device 20B is the same as that shown in FIG.

On the other hand, the control signal decoder 27 included in the receiving device 20B includes a control signal carrier extraction unit 271, a differential STC decoding unit 272 (STC decoding unit 2721 and a delay unit 2722), and an error correction decoding unit 274, respectively, FIG. The control signal carrier extraction unit 271a, the differential STC decoding unit 272a, and the error correction decoding unit 274 shown in the above are similarly configured.

That is, the control signal decoder 27 included in the receiving device 20B is configured to receive the coded signal relating to the TMCC signal encoded by the differential STC transmitted by the transmitting device 10B on only one system (FIG. 27a). ).

Therefore, the control signal decoder 27 included in the receiving device 20B can be shared by the MIMO, MISO, and SISO transmission methods.

As described above, the transmission diversity effect cannot be expected in the transmission of only one system, but the reception characteristics equivalent to those in the case of transmission without STC coding can be secured. With this transmission system, a control signal (TMCC signal or AC signal) can be transmitted while having compatibility with SISO, MISO, and MIMO.

[Third Embodiment]
Next, the transmission system of the third embodiment according to the present invention will be described with reference to FIG. 7. 7 (a) and 7 (b) are block diagrams showing a schematic configuration of transmission devices 10A-1 and 10A-2 in the transmission system according to the third embodiment of the present invention, respectively.

The transmission devices 10A-1 and 10A-2 in the transmission system of the third embodiment shown in FIG. 7 are examples of constructing a broadcasting network by SFN by the transmission method of MIMO or MISO. The transmission devices 10A-1 and 10A-2 are composed of the same components as the transmission device 10A shown in FIG. 1 as the transmission device of the first transmission station and the transmission device of the second transmission station, respectively.

However, in order to construct a broadcasting network by SFN, the control signal generation unit 14 included in each of the transmission devices 10A-1 and 10A-2 is a TMCC signal (or the same additional information) having the same transmission control information between the two transmission stations. AC signal with) is generated.

Further, the control signal encoder 15 provided in each of the transmission devices 10A-1 and 10A-2 is differentially provided by the differential STC coding unit 153 at each transmission station in the same manner as in the transmission device 10A shown in FIG. Two signal systems (15a, 15b in the figure) are secured at each transmission station for the transmission of the coded signal for the STC-encoded TMCC signal. Therefore, each of the transmission devices 10A-1 and 10A-2 transmits the coded signals of the two signal systems (15a and 15b in the figure) relating to the TMCC signal with the alternate polarization.

For example, in a polarization MIMO transmission method in which a data signal is transmitted by two different polarizations (for example, horizontal and vertical), the first transmission antenna Tx1 of the transmission device 10A-1 of the first transmission station and the transmission of the second transmission station. The first transmitting antenna Tx1 of the device 10A-2 has a first polarization (for example, horizontal), and the second transmitting antenna Tx2 of the transmitting device 10A-1 of the first transmitting station and the transmitting device 10A-2 of the second transmitting station The second transmitting antenna Tx2 has a second polarization (for example, vertical).

At this time, with respect to the transmission device 10A-1 of the first transmission station, a differential STC signal (encoded signal) relating to the TMCC signal of the signal system shown in FIG. 15a is assigned to the OFDM signal of the first polarization (for example, horizontal). , A differential STC signal (encoded signal) relating to the TMCC signal of the signal system shown in FIG. 15b is assigned to the OFDM signal of the second polarization (for example, vertical).

On the other hand, with respect to the transmission device 10A-2 of the second transmission station, a differential STC signal (encoded signal) relating to the TMCC signal of the signal system shown in FIG. 15b is assigned to the OFDM signal of the first polarization (for example, horizontal). A differential STC signal (encoded signal) relating to the TMCC signal of the signal system shown in FIG. 15a is assigned to the OFDM signal of the second polarization (for example, vertical).

In this way, when constructing the SFN, the TMCC signal is transmitted as a horizontal and vertically polarized signal of the second transmission station in a signal system in which the horizontally and vertically polarized signals of the first transmission station are exchanged. Configure to. That is, the TMCC signal of the same signal system as the horizontally polarized wave of the first transmission station is transmitted by the vertically polarized wave of the second transmission station. Similarly, the TMCC signal of the same signal system as the vertically polarized wave of the first transmission station is transmitted by the horizontally polarized wave of the second transmission station.

The configuration of the receiving device in the transmission system of the third embodiment may be the same as that of the receiving device 20A shown in FIG. 3 in the case of the MIMO transmission method and the receiving device 20B shown in FIG. 6 in the case of the MISO transmission method. can.

By performing such transmission, especially in the receiving device of the MISO transmission method, reception is performed by one receiving antenna, so differential STC signals (encoded signals) of the same system are assigned from two transmission stations. Compared with the case of transmission, it is possible to alleviate the drop in power due to reverse phase synthesis. Further, even in the transmission mode as in the present embodiment, since the code that is a pair of the differential STC codes is transmitted, the transmission path estimation for the decoding process is not required.

[Fourth Embodiment]
Next, the transmission system of the fourth embodiment according to the present invention will be described with reference to FIG. 8 (a) and 8 (b) are block diagrams showing a schematic configuration of transmission devices 10B-1 and 10B-2 in the transmission system of the fourth embodiment according to the present invention, respectively.

The transmission devices 10B-1 and 10B-2 in the transmission system of the fourth embodiment shown in FIG. 8 are examples of constructing a broadcasting network by SFN by the transmission method of SISO. The transmission devices 10B-1 and 10B-2 are composed of the same components as the transmission device 10B shown in FIG. 5, as the transmission device of the first transmission station and the transmission device of the second transmission station, respectively.

However, in order to construct a broadcasting network by SFN, the control signal generation unit 14 included in each of the transmission devices 10B-1 and 10B-2 is a TMCC signal (or the same additional information) having the same transmission control information between the two transmission stations. AC signal with) is generated.

Further, the control signal encoder 15 provided in each of the transmission devices 10B-1 and 10B-2 is differentially provided by the differential STC coding unit 153 at each transmission station in the same manner as in the transmission device 10B shown in FIG. One signal system (15a or 15b in the figure) is secured at each transmission station for the transmission of the coded signal for the STC-encoded TMCC signal. Therefore, each of the transmitting devices 10B-1 and 10B-2 transmits a coded signal of one signal system (15a or 15b in the figure) relating to the TMCC signal.

For example, in a SISO transmission method in which a data signal is transmitted using one of two different polarizations (for example, horizontal and vertical), the transmission antenna Tx of the transmission device 10B-1 at the first transmission station has a first deviation. The wave (for example, horizontal) is used, and the second polarization (for example, vertical) is used for the transmission antenna Tx of the transmission device 10B-2 of the second transmission station.

At this time, for the transmission device 10B-1 of the first transmission station, a differential STC signal (encoded signal) relating to the TMCC signal of the signal system shown in FIG. 15a is assigned as the OFDM signal of the first polarization (for example, horizontal).

On the other hand, for the transmission device 10B-2 of the second transmission station, a differential STC signal (encoded signal) relating to the TMCC signal of the signal system shown in FIG. 15b is assigned as the OFDM signal of the second polarization (for example, vertical).

In this way, when constructing the SFN, TMCC signals of different systems are transmitted between the first and second transmission stations.

The configuration of the receiving device in the transmission system of the fourth embodiment can be configured in the same manner as the receiving device 20B shown in FIG.

By performing such transmission, in the receiving device of the SISO transmission method, reception is performed by one receiving antenna, so differential STC signals (encoded signals) of the same system are assigned from two transmission stations and transmitted. It is possible to alleviate the drop in power due to reverse phase synthesis. Further, even in the transmission mode as in the present embodiment, since the code that is a pair of the differential STC codes is transmitted, the transmission path estimation for the decoding process is not required.

As described above, the TMCC signal can be transmitted to the SFN broadcasting network using the transmission coding format as the differential STC, as in the transmission systems of the third and fourth embodiments, and in particular, the SFN. Since it is possible to transmit different TMCC signals between the same polarizations at the two broadcasting stations that construct the above, the influence of reverse phase synthesis can be avoided and the diversity reception effect can be expected.

Further, in the first to fourth embodiments, the transmission control information includes hierarchical information for constituting an OFDM frame, carrier information of data signals, and decoding control information, and at least any transmission method of SISO, MISO, and MIMO. By configuring the receiver to include the identification information of the transmission method for identifying whether it is used or not, the receiving device identifies the transmission method based on the identification information, and the data signal is demolished and decoded. Can be configured to do. This makes it possible to improve the compatibility of control signals regardless of the transmission method.

Although the present invention has been described above with reference to examples of specific embodiments, the present invention is not limited to the examples of the above-described embodiments, and can be variously modified without departing from the technical idea. For example, in the example of the above-described embodiment, in the MIMO transmission method, a 2 × 2 MINO using two transmitting antennas and two receiving antennas has been described. For example, the number of receiving antennas is M (M is 3 or more). 2 × M MIMO is configured as an integer) book, and reception diversity synthesis is performed on the receiving device side, or multiple control signal encoders 15 are provided in one transmitting device, and N (N is 3). It is also possible to configure N × M MIMO with the above integer) transmission antennas.

Further, in the example of the above-described embodiment, an example in which the differential STC coding process is performed so as to generate one block of the differential STC block over two symbols of the control signal has been described as the differential STC coding process. It is also possible to configure the differential STC coding process so as to generate one block of differential STC blocks over longer symbols.

Further, in the example of the above-described embodiment, an example in which horizontal polarization and vertical polarization are used as the polarization used for transmission has been described. It is also applicable to the embodiment of the polarization of 45 ° and the polarization of diagonally left 45 °.

Further, each of the control signal encoder 15 and the control signal decoder 27 according to the present invention includes, as a semiconductor chip, one composed of one chip, one composed of a plurality of chips, one composed of discrete parts, or these. Includes those configured by combining discrete parts and one chip or a plurality of chips.

Further, each of the transmitting devices 10A, 10A-1,10A-2,10B, 10B-1,10B-2 and the receiving devices 20A, 20B according to the present invention is composed of one chip as a semiconductor chip, and is composed of a plurality of chips. It includes those which are composed, those which are composed of discrete parts, or those which are composed of a combination of these discrete parts and one chip or a plurality of chips.

Therefore, the control signal encoder, the control signal decoder, the transmitting device and the receiving device, and the transmitting method and the receiving method according to the present invention are not limited to the examples of the above-described embodiments, and are within the scope of the claims. Limited only by description.

According to the present invention, it is possible to transmit a control signal having a required C / N smaller than the transmission characteristic of the data signal, which is useful in next-generation terrestrial digital broadcasting.

10A, 10A-1,10A-2,10B, 10B-1,10B-2 Transmitter 11 Error correction coding unit 12 Carrier modulation unit 13 STC coding unit 14 Control signal generator 15 Control signal encoder 16, 16a , 16b OFDM frame configuration unit 17,17a, 17b Inverse Fourier transform (IFFT) unit 18,18a, 18b Guard interval (GI) addition unit 20A, 20B Receiver 21,21a, 21b Guard interval (GI) removal unit 22,22a , 22b Fourier conversion (FFT) unit 23 Data signal carrier extraction unit 23a First data carrier extraction unit 23b Second data carrier extraction unit 24 Transmission path estimation unit 25 STC decoding unit 26 Error correction Decoding unit 27 Control signal decoder 151 Error correction Coding unit 152 Carrier modulation unit 153 Differential STC coding unit 271,271a, 271b Control signal carrier extraction unit 272,272a, 272b Differential STC decoding unit 273 Synthesis unit 274 Error correction decoding unit 1531 Differential symbol generation unit 1532 Delay Part 1533 STC coding part 2721,221a, 2721b STC decoding part 2722, 2722a, 2722b Delay part Tx, Tx1, Tx2 Transmitting antenna Rx, Rx1, Rx2 Receiving antenna

Claims (5)

A control signal decoder that decodes a control signal that has undergone differential spatiotemporal coding processing as a coded signal in a receiving device that receives an OFDM signal.
A carrier extraction means for extracting carriers of a control signal subjected to the differential spatiotemporal coding process from the OFDM signal, and a carrier extraction means.
A differential spatiotemporal decoding processing means for performing a differential spatiotemporal decoding process corresponding to the differential spatiotemporal coding process based on the carrier symbol of the extracted control signal is provided .
The differential spatio-temporal decoding processing means decodes two different coded signals by the differential spatio-temporal coding process, respectively.
A control signal decoder further comprising a synthesis means for diversity-synthesizing two different coded signals decoded by the differential spatiotemporal decoding processing means . The control signal decoder according to claim 1 , wherein the differential spatio-temporal decoding processing means performs a decoding process corresponding to the differential spatio-temporal coding process that does not require transmission path estimation. Carrier addition means for adding a plurality of carriers of the control signal extracted by the carrier extraction means, or LLR addition for adding the signal after the differential spatiotemporal decoding process corresponding to the plurality of carriers based on the log-likelihood ratio. The control signal decoder according to claim 1 or 2 , further comprising means. The control signal decoder according to any one of claims 1 to 3 .
A data signal processing means for demodulating and decoding a data signal based on the transmission control information stored in the control signal decoded by the control signal decoder.
A receiving device characterized by comprising. The transmission control information identifies to the receiving side which transmission method of hierarchical information for constituting an OFDM frame, carrier information of a data signal, and decoding control information, at least SISO, MISO, and MIMO is used. Includes transmission method identification information for
The receiving device according to claim 4 , wherein the data signal processing means identifies the transmission method based on the identification information, and performs demodulation and decoding processing of the data signal.

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