Transmitting device and receiving device

Abstract

To enable transmission and reception through MIMO transmission and CB transmission with a simpler configuration.SOLUTION: A modulator 20 comprises: a system separation unit 205 for separating data signals after error correction coding into a first system and a second system; a pilot signal generation unit 206 for generating and outputting a pilot signal; an OFDM frame configuration unit 214 for adding the output pilot signal to the data signal in the first system to configure a first transmission frame; and an OFDM frame configuration unit 215 for adding the pilot signal to the data signal in the second system to configure a second transmission frame. The pilot signal generation unit 206 outputs a first pilot signal to the OFDM frame configuration units 214, 15 when CB transmission is conducted, or outputs the first pilot signal to the OFDM frame configuration unit 214 and outputs a second pilot signal to the OFDM frame configuration unit 215 when MIMO transmission is conducted.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a transmitting device and a receiving device. [Background technology]

[0002] Japan's digital terrestrial television broadcasting is characterized by its ability to simultaneously provide HD (High-Definition) quality broadcasting services and SD (Standard-Definition) quality one-segment broadcasting services on one physical channel. In the next generation of digital terrestrial television broadcasting, UHD (Ultra-high Definition) quality broadcasting services are expected, and the development of a transmission method called the Advanced Terrestrial Broadcasting Method (hereinafter referred to as the "Advanced Method") is underway. Channel Bonding (hereinafter referred to as "CB") transmission is an optional function of the Advanced Method. CB transmission is a function that expands transmission capacity by combining N (N is an integer satisfying 2) physical channels (ch) for transmission. There are two modes of CB transmission: a plain mode that splits a data stream into two systems at the transport layer before error correction coding, and a MIMO (Multiple-Input and Multiple-Output) like mode that splits a data stream into two systems at the physical layer after error correction coding. When the C / N (Carrier to Noise ratio) of two physical channels is different, the MIMO-like mode can obtain a diversity effect compared to the plain mode, and therefore the transmission characteristics are improved. In the following, the two physical channels constituting the CB transmission with N=2 are referred to as the primary channel and the secondary channel.

[0003] Examples of use cases for CB transmission with N=2 include the transmission of 8K video content with a frame rate of 120Hz, a transition channel in which three or more operators share two channels to provide services equivalent to ISDB-T (Integrated Services Digital Broadcasting-Terrestrial), the current terrestrial digital broadcasting system in Japan, etc. As a precedent example, CB transmission combining two channels is specified as an optional function in ATSC (Advanced Television Systems Committee) 3.0, the next-generation terrestrial broadcasting system in the United States (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-022118 A Summary of the Invention [Problem to be solved by the invention]

[0005] Another optional feature of the advanced system is MIMO transmission. MIMO transmission is a function that expands transmission capacity by splitting a data signal into two systems and transmitting each system using different first and second polarizations on the same physical channel. Here, the first and second polarizations are, for example, horizontal and vertical polarizations, or right-handed and left-handed circular polarizations.

[0006] MIMO transmission and CB transmission combining two physical channels in MIMO-like mode have in common the fact that data signals after error correction coding are separated into two systems for transmission. However, MIMO transmission, which transmits and receives using one physical channel, and CB transmission, which transmits and receives using a combination of two physical channels, are different functions, and therefore dedicated circuits are required to implement each function. Therefore, when configuring a device compatible with MIMO transmission and CB transmission, a dedicated circuit for MIMO transmission and a dedicated circuit for CB transmission are required, but providing dedicated circuits for MIMO transmission and CB transmission respectively leads to an increase in circuit size and cost. Therefore, a simpler configuration capable of transmitting and receiving by MIMO transmission and CB transmission (especially CB transmission in MIMO-like mode) is required.

[0007] An object of the present invention is to solve the above-mentioned problems and to provide a transmitting device and a receiving device that are capable of transmitting and receiving by MIMO transmission and CB transmission with a simpler configuration. [Means for solving the problem]

[0008] In order to solve the above problems, a transmitting device according to the present invention is a transmitting device capable of MIMO transmission in which a first transmission frame and a second transmission frame including data signals separated into two systems are transmitted in one physical channel using a first polarized wave and a second polarized wave, and channel bonding transmission in which two physical channels are combined and transmitted, the transmitting device comprising: a system separating unit that separates the data signal after error correction coding into a first system and a second system; a pilot signal generating unit that generates and outputs a pilot signal; and a transmitting unit that receives the pilot signal output from the pilot signal generating unit and transmits the data signal of the first system. and a second frame constructing unit that constructs the second transmission frame by adding a pilot signal output from the pilot signal generating unit to the second system data signal, wherein the pilot signal generating unit outputs a first pilot signal to the first frame constructing unit and the second frame constructing unit when performing the channel bonding transmission, and outputs the first pilot signal to the first frame constructing unit and the second pilot signal to the second frame constructing unit when performing the MIMO transmission.

[0009] In addition, the transmitting device of the present invention preferably further includes a TMCC signal generating unit that generates a TMCC signal including TMCC information and outputs the generated TMCC signal to the first frame configuration unit and the second frame configuration unit, wherein the TMCC information has flag information superimposed thereon indicating whether or not to perform the channel bonding transmission, and the pilot signal generating unit determines whether or not to perform the channel bonding transmission based on the flag information.

[0010] Further, the receiving device according to the present invention comprises: In one physical channel,A receiving device receives a first transmission frame and a second transmission frame including data signals separated into two systems, which are transmitted by MIMO transmission in which a first polarized wave and a second polarized wave are used for transmission, or by channel bonding transmission in which two physical channels are combined and transmitted, and the receiving device includes: a first pilot processing unit that extracts a pilot signal from the received first transmission frame and performs channel estimation using the extracted pilot signal; a second pilot processing unit that extracts a pilot signal from the received second transmission frame and performs channel estimation using the extracted pilot signal; a combining unit that combines an equalized signal for the received first transmission frame based on an estimate of the first pilot processing unit and an equalized signal for the received second transmission frame based on an estimate of the second pilot processing unit; a decoding unit that decodes the signal combined by the combining unit; and a control unit that controls processing of the second pilot processing unit depending on whether the MIMO transmission or the channel bonding transmission is being performed.

[0011] In addition, in the receiving device of the present invention, the first transmission frame and the second transmission frame include a TMCC signal including TMCC information, and flag information indicating whether or not the channel bonding transmission is to be performed is superimposed on the TMCC information, and the receiving device further includes a discrimination unit that extracts TMCC information from the TMCC signal included in the first transmission frame and determines whether or not the channel bonding transmission is to be performed based on the flag information superimposed on the extracted TMCC information, and the control unit controls processing of the second pilot processing unit based on a result of the discrimination by the discrimination unit. Effect of the Invention

[0012] According to the transmitting device and receiving device of the present invention, transmission and reception by MIMO transmission and CB transmission are possible with a simpler configuration. [Brief description of the drawings]

[0013] [Figure 1]1 is a diagram illustrating an example of the configuration of a transmission / reception system in which CB transmission in MIMO Like mode with N=2 is performed according to one embodiment of the present invention. [Diagram 2] FIG. 1 illustrates an example of the configuration of a conventional remultiplexing device. [Diagram 3] FIG. 2 is a diagram illustrating an example of the configuration of a remultiplexing device illustrated in FIG. [Figure 4] FIG. 1 is a diagram illustrating an example of the configuration of a conventional modulation device. [Diagram 5] 5 is a diagram illustrating an example of the configuration of a pilot signal generating unit illustrated in FIG. 4. [Figure 6] FIG. 2 is a diagram illustrating an example of the configuration of a modulation device illustrated in FIG. [Figure 7] 7 is a diagram illustrating an example of the configuration of a pilot signal generating unit illustrated in FIG. 6. [Figure 8] FIG. 2 is a diagram illustrating an example of the configuration of a demodulation device illustrated in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] FIG. 1 is a diagram showing a configuration example of a transmission / reception system 1 according to an embodiment of the present invention. FIG. 1 shows a configuration example of a transmission / reception system 1 in which channel bonding transmission (CB transmission) in a MIMO-like mode and MIMO transmission in which a horizontally polarized wave is used as a first polarization and a vertically polarized wave orthogonal to the first polarization is used as a second polarization in one physical channel are performed. Note that the MIMO transmission may be performed using, for example, right-handed circular polarization and left-handed polarization. In the current ISDB-T, hierarchical transmission is performed in which data signals of multiple layers with different transmission resistance and transmission capacity are simultaneously transmitted in the same channel. In addition, in the advanced method, it is considered to transmit emergency earthquake alerts and the like with low latency compared to the data signals of each layer on the same physical channel as the data signals of each layer. A transmission path through which such low-latency data signals are transmitted is called LLch. In the following, a description will be given assuming that hierarchical transmission of three layers (layers A, B, and C) and transmission on LLch are performed.

[0016] The transmission / reception system 1 shown in FIG. 1 includes a remultiplexing device 10, a modulation device 20 as a transmission device according to the present invention, two transmitters 30 (transmitters 30p, 30s), two receivers 40 (receivers 40, 40s), and a demodulation device 50 as a reception device according to the present invention. The transmitter 30p and the receiver 40p are provided corresponding to a primary ch in CB transmission, for example, and the transmitter 30s and the receiver 40s are provided corresponding to a secondary ch. The transmitter 30p and the receiver 40p are provided corresponding to a system transmitted by horizontal polarization in MIMO transmission, for example, and the transmitter 30s and the receiver 40s are provided corresponding to a system transmitted by vertical polarization. Note that the example in the figure shows an embodiment of transmission using multiple antennas, but in MIMO transmission, a polarized dual-purpose antenna corresponding to horizontal polarization and vertical polarization may be used, and a single transmission antenna or a single reception antenna may be used. In CB transmission, a single transmission antenna or a single reception antenna corresponding to the frequency band of the ch in which CB is performed may be used.

[0017] The remultiplexer 10 remultiplexes the data signals (video and audio data) of each layer of the hierarchical transmission with the data signal of the LL channel. The remultiplexer 10 outputs a multiplexed frame in which the data signals of each layer and the data signal of the LL channel are remultiplexed to the modulator 20.

[0018] The modulation device 20 separates the output of the remultiplexing device 10 into two systems, and performs predetermined processing such as error correction coding and carrier modulation on each system to configure an OFDM (Orthogonal Frequency Division Multiplexing) frame. The modulation device 20 performs IFFT (Inverse Fast Fourier Transform) processing and adds a guard interval (GI) to the configured OFDM frame, and outputs it to the transmitters 30p and 30s. When performing CB transmission, the transmitter 30p transmits the OFDM frame output from the modulation device 20 via a primary ch. When performing MIMO transmission, the transmitter 30p transmits the OFDM frame output from the modulation device 20 using horizontal polarization on one physical ch. When performing CB transmission, the transmitter 30s transmits the OFDM frame output from the modulation device 20 via a secondary ch. Furthermore, when MIMO transmission is performed, the transmitter 30s transmits the OFDM frame output from the modulation device 20 using vertically polarized waves on the same physical channel as the transmitter 30p. The transmitters 30p and 30s are synchronized and emit broadcast waves at the same timing.

[0019] The receiver 40p receives the broadcast waves transmitted from the transmitter 30p and outputs the received signal to the demodulation device 50. The receiver 40s receives the broadcast waves transmitted from the transmitter 30s and outputs the received signal to the demodulation device 50.

[0020] The demodulation device 50 combines and demodulates the received signal of the receiver 40p and the received signal of the receiver 40s, and obtains and outputs the data signals of each layer and the data signal of the LLch.

[0021] Next, the configurations of the remultiplexing device 10 according to the present invention, the modulation device 20 as a transmitting device according to the present invention, and the demodulation device 50 as a receiving device according to the present invention will be described. The configurations of the transmitter 30 and the receiver 40 are not directly related to the present invention, so their description will be omitted.

[0022] First, before describing the configuration of the remultiplexing device 10, for comparison purposes, the configuration of a conventional remultiplexing device 10a that does not support CB transmission will be described with reference to FIG.

[0023] When hierarchical transmission (layers A, B, and C) and transmission on the LLch are performed, a multiplexing device is provided corresponding to each layer and LLch. The multiplexing device corresponding to each layer multiplexes video and audio data transmitted on the corresponding layer and packetizes it into packets in MMT (MPEG Media Transport) format (MMT packets), for example. The multiplexing device of each layer generates IP packets (hereinafter referred to as "MMT / IP packets") that store the generated MMT packets, and outputs them to the remultiplexing device 10a. The multiplexing device corresponding to the LLch multiplexes data transmitted on the LLch to generate MMT packets, and outputs the MMT / IP packets that store the MMT packets to the remultiplexing device 10a.

[0024] The remultiplexer 10a remultiplexes the MMT / IP packets output from the multiplexers corresponding to each layer and LLch into one system. As shown in FIG. 2, the remultiplexing device 10a includes a packet filter 101, an IP header compression unit 102, a TLV (Type Length Value) packetization unit 103, a FIFO (First In First Out) buffer 104, an FEC (Forward Error Correction) block construction unit 105, a hierarchical frame construction unit 106, an XMI (eXtensible Modulation Interface) packetization unit 107, a packet filter 108, IP header compression units 109, 110, TLV packetization units 111, 112, FIFO buffers 113, 114, an L0 symbol construction unit 115, an L1 symbol construction unit 116, a GPS reference signal generator 117, a synchronization control XMI packet construction unit 118a, a stuff XMI packet construction unit 119, and an XMI packet transmission scheduler unit 120a. Packet filter 101, IP header compression unit 102, TLV packetization unit 103, FIFO buffer 104, FEC block configuration unit 105, layer-specific frame configuration unit 106, and XMI packetization unit 107 are provided corresponding to layers A, B, and C, respectively, but for simplicity of illustration, only the configuration corresponding to layer A is shown in Fig. 2. The configuration corresponding to layer A will be described below, but the same applies to layers B and C.

[0025] Packet filter 101 receives layer A data (MMT / IP packets) from a multiplexing device (not shown) corresponding to layer A. Packet filter 101 selects packets to be transmitted (packet filtering) based on the source IP address, destination IP address, protocol type, source port number and destination port number in the UDP (User Datagram Protocol) header of the input MMT / IP packet, and outputs the selected MMT / IP packet to IP header compression unit 102.

[0026] The IP header compression unit 102 compresses the IP header of the MMT / IP packet output from the packet filter 101 as necessary, and outputs the compressed packet to the TLV packetization unit 103 .

[0027] The TLV packetizer 103 receives signaling information (TLV-SI) in a TLV format. The SI specifies, for example, a terrestrial distribution system descriptor indicating the physical conditions of a terrestrial transmission path. The TLV packetizer 103 encapsulates the received TLV-SI and the MMT / IP packet output from the IP header compressor 102 into a TLV packet to generate a TLV packet. The TLV packet includes a reservation area, a packet type area, a data length area, and a data area. The packet type area indicates the type of the TLV packet, and the data length area indicates the size of the data stored in the data area. The TLV packetizer 103 stores the TLV-SI and the MMT / IP packet in the data area. Details regarding TLVs are described in, for example, "Video coding, audio coding, and multiplexing specifications for digital broadcasting", ARIB-STD B32, and therefore will not be described here.

[0028] The TLV packetizer 103 outputs the generated TLV packet to the FIFO buffer 104 .

[0029] FIFO buffer 104 stores the TLV packets output from TLV packetization section 103, and outputs the stored TLV packets to FEC block configuration section 105 in the order in which they were stored.

[0030] The multiplexing device corresponding to each layer may output the multiplexed data as a TLV packet (TLV / IP packet) instead of an MMT / IP packet. In this case, the TLV packet output from the multiplexing device is stored in the FIFO buffer 104. When the TLV packet is input from the multiplexing device, the remultiplexing device 10a does not need to include the packet filter 101, the IP header compression unit 102, and the TLV packetization unit 103.

[0031] The FEC block constructing unit 105 constructs an FEC block at a constant period from the TLV packets output from the FIFO buffer 104. The FEC block is a block (processing block) that serves as a unit of error correction coding processing.

[0032] The FEC block includes an FEC block header area, a main signal area, a BCH parity area, a stuff bit area, and an LDPC parity area. The main signal area stores TLV packets output from the FIFO buffer 104. The FEC block header area is a field (first TLV indication field) that stores information indicating the position of the first byte of the first TLV packet stored in the main signal area of ​​the FEC block, expressed as the number of bytes from the beginning of the FEC block excluding the FEC block header. The BCH parity area, the stuff bit area, and the LDPC area store the bit "1".

[0033] The FEC block constructing unit 105 concatenates the TLV packets output from the FIFO buffer 104 in the order of output, stores them in the main signal area, and sets the value of the top TLV indication field for each FEC block. The FEC block constructing unit 105 outputs the constructed FEC blocks to the hierarchical frame constructing unit 106.

[0034] The layer-specific frame constructing section 106 constructs layer-specific frames from the FEC blocks output from the FEC block constructing section 105 .

[0035] The hierarchical frame includes a frame header area and an FEC block area. The FEC block area stores multiple concatenated FEC blocks and FEC block fragments. The size of the hierarchical frame is determined according to the modulation method, FFT (Fast Fourier Transform) size, GI ratio, pilot signal ratio, and number of segments (the number of segments into which the frequency band of one physical channel (physical ch) is divided), etc.

[0036] The frame header area includes an FEC block pointer with a predetermined number of bits, and the remaining area stores the bit "1." The FEC block pointer indicates the position, in bits or bytes, of the first bit of the first FEC block, including the beginning of the FEC blocks to be stored in the hierarchical frame, from the start position of the FEC block area.

[0037] The layer-specific frame constructing unit 106 concatenates the FEC blocks output from the FEC block constructing unit 105 in the order of output, and stores them in the FEC block area. The layer-specific frame constructing unit 106 calculates an FEC block pointer from the position of the FEC block stored in the FEC block area, and stores it in the frame header. The layer-specific frame constructing unit 106 outputs the constructed layer-specific frame to the XMI packetizing unit 107.

[0038] The XMI packetizer 107 composes an XMI packet (A-layer XMI packet) from the layer-specific frame output from the layer-specific frame composing unit 106. Specifically, the XMI packetizer 107 divides the layer-specific frame into pieces of a predetermined size (for example, 10448 bits) to compose data units. The XMI packet includes a header and a data unit area. The XMI packetizer 107 stores the data units in the data unit area. Note that there are cases where the last data unit is smaller than the predetermined size. In this case, the XMI packetizer 107 adds predetermined bits (stuff bits) to the data units that do not reach the predetermined size to make them the predetermined size, and stores them in the data unit area.

[0039] The XMI packetizer 107 outputs the generated XMI packets to the XMI packet transmission scheduler 120a. Note that XMI is a protocol designed as an interface for outputting layer-by-layer OFDM frames to the modulator 20.

[0040] Packet filter 108 receives LLch data (MMT / IP packets) from a multiplexer (not shown) corresponding to the LLch. Packet filter 108 selects packets to be transmitted (packet filtering) based on the source IP address, destination IP address, protocol type, source port number and destination port number of the UDP header of the input MMT / IP packet, and outputs the selected MMT / IP packet to IP header compression unit 109 or IP header compression unit 110.

[0041] If necessary, the IP header compression unit 109 compresses the IP header of the MMT / IP packet output from the packet filter 108, and outputs the result to a TLV packetization unit 111. If necessary, the IP header compression unit 110 compresses the IP header of the MMT / IP packet output from the packet filter 108, and outputs the result to a TLV packetization unit 112.

[0042] The TLV packetization unit 111 encapsulates the MMT / IP packet output from the IP header compression unit 109 into a TLV packet to generate a TLV packet, and outputs it to the FIFO buffer 113. The TLV packetization unit 112 encapsulates the MMT / IP packet output from the IP header compression unit 110 into a TLV packet to generate a TLV packet, and outputs it to the FIFO buffer 114.

[0043] FIFO buffer 113 stores the TLV packets output from TLV packetizer 111, and outputs the stored TLV packets to L0 symbol constructor 115 in the order they were stored. FIFO buffer 114 stores the TLV packets output from TLV packetizer 112, and outputs the stored TLV packets to L1 symbol constructor 116 in the order they were stored.

[0044] The multiplexing device corresponding to the LLch may output the multiplexed data as a TLV packet (TLV / IP packet) instead of an MMT / IP packet. In this case, the TLV packet output from the multiplexing device is stored in the FIFO buffers 113 and 114. When the TLV packet is input from the multiplexing device, the remultiplexing device 10a may include a packet filter 121 instead of the packet filter 108.

[0045] The packet filter 121 selects (packet filters) a packet to be transmitted based on the source IP address, destination IP address, protocol type, source port number and destination port number of the UDP header of the TLV packet (TLV / IP packet) input from a multiplexing device (not shown) corresponding to the LLch, and outputs the selected TLV packet to the FIFO buffer 13 or the FIFO buffer 114. Therefore, when a TLV packet is input from a multiplexing device corresponding to the LLch, the remultiplexing device 10a does not need to include the packet filter 108, the IP header compression units 109 and 110, and the TLV packetization units 111 and 112.

[0046] The L0 symbol constructing unit 115 constructs a symbol (L0 symbol) from the TLV packet output from the FIFO buffer 113, and outputs it to the XMI packet transmission scheduler unit 120a. The L1 symbol constructing unit 116 constructs a symbol (L1 symbol) from the TLV packet output from the FIFO buffer 114, and outputs it to the XMI packet transmission scheduler unit 120a.

[0047] For example, the L0 symbol is transmitted in a segment for partial reception among a plurality of segments obtained by dividing the frequency band of one physical channel, and the L1 symbol is transmitted in the remaining segment. Therefore, packet filtering by the packet filter 108 (or the packet filter 121) is also performed according to such allocation.

[0048] A GPS reference signal generator 117 outputs a reference signal of a constant period, which is generated from a GPS received signal.

[0049] The synchronization control XMI packet constructing unit 118a generates synchronization control information including transmission parameters for constructing an OFDM frame, timing for transmitting the OFDM frame, and TMCC (Transmission and Multiplexing Configuration Control) information which is control information related to the transmission of data signals of each layer. The TMCC information includes, for example, the carrier modulation method and coding rate of the data signal of each layer. The synchronization control XMI packet constructing unit 118a generates an XMI packet (hereinafter referred to as a "synchronization control XMI packet") that stores the generated synchronization control information in a data unit area, and outputs the XMI packet transmission scheduler unit 120a.

[0050] The stuff XMI packet constructing unit 119 constructs an XMI packet in which only stuff bits of the same size as the data unit are stored in the data unit area (hereinafter referred to as a "stuff XMI packet"), and outputs it to the XMI packet sending scheduler unit 120a. The stuff XMI packet is used to keep the number of XMI packets output per second by the remultiplexing device 10a constant even when the modulation method or coding rate is different.

[0051] The XMI packet transmission scheduler unit 120a multiplexes the XMI packets of each layer (A layer XMI packets, B layer XMI packets and C layer XMI packets) output from the XMI packetization units 107 corresponding to the A layer, B layer and C layer, the L0 symbols output from the L0 symbol composition unit 115, the L1 symbols output from the L1 symbol composition unit 116, the synchronization control XMI packets output from the synchronization control XMI packet composition unit 118a and the stuff XMI packets output from the stuff XMI packet composition unit 119 into a single system and outputs it to the transmitter 30.

[0052] The current ISDB-T uses SFN (Single Frequency Network), which transmits the same broadcast content from multiple transmission stations at the same frequency. Therefore, the XMI packet transmission scheduler unit 120a outputs XMI packets divided into multiple systems (two systems in FIG. 2). However, the data in each system is the same.

[0053] Next, the configuration of the remultiplexing device 10 will be described with reference to Fig. 3. In Fig. 3, the same components as those in Fig. 2 are given the same reference numerals, and the description thereof will be omitted.

[0054] The remultiplexing device 10 shown in Figure 3 includes a packet filter 101, an IP header compression unit 102, a TLV packetization unit 103, a FIFO buffer 104, an FEC block construction unit 105, a hierarchical frame construction unit 106, an XMI packetization unit 107, a packet filter 108, IP header compression units 109, 110, TLV packetization units 111, 112, FIFO buffers 113, 114, an L0 symbol construction unit 115, an L1 symbol construction unit 116, a GPS reference signal generator 117, a synchronization control XMI packet construction unit 118, a stuff XMI packet construction unit 119, an XMI packet transmission scheduler unit 120, and a CB TLV-SI generation unit 122. The remultiplexing device 10 shown in Figure 3 differs from the remultiplexing device 10a shown in Figure 2 in that it adds a CB TLV-SI generation unit 122 and that the synchronization control XMI packet construction unit 118a and the XMI packet transmission scheduler unit 120a have been changed to a synchronization control XMI packet construction unit 118 and an XMI packet transmission scheduler unit 120, respectively.

[0055] The synchronization control XMI packet constructing unit 118, like the synchronization control XMI packet constructing unit 118a, generates synchronization control information including TMCC information related to the transmission of data signals of each layer, and generates a synchronization control XMI packet in which the generated synchronization control information is stored in a data unit area. In this embodiment, the synchronization control XMI packet constructing unit 118 superimposes a CB flag (flag information) indicating whether or not CB transmission is performed in a physical channel that transmits data signals of each layer, on the TMCC information. The synchronization control XMI packet constructing unit 118 outputs the synchronization control XMI packet in which the synchronization control information including the TMCC information on which the CB flag is superimposed is stored in a data unit area to the XMI packet sending scheduler unit 120.

[0056] The CB TLV-SI generating unit 122 generates channel bonding control information (hereinafter referred to as "CB control information"), which is control information required for receiving CB transmission. Specifically, the CB TLV-SI generating unit 122 generates a TLV format packet including CB control information (hereinafter referred to as "CB TLV-SI packet"). The CB control information includes at least frequency information of physical channels constituting the CB transmission used in the area. For example, if N=2, it includes frequency information of a pair of primary and secondary channels. When a multi-frequency network (MFN) using different frequencies for each area is adopted, the CB control information includes at least frequency information of physical channels constituting the CB transmission in all areas. If N=2, it includes frequency information of the primary and secondary channels. The CB TLV-SI generating unit 122 outputs the generated CB TLV-SI packet to the TLV packetizing unit 112 at regular intervals (for example, at 1-second intervals).

[0057] The TLV packetizer 112 outputs to the FIFO buffer 114 the TLV packets in which the MMT / IP packets output from the IP header compressor 110 are stored in the data area, and the CB TLV-SI packets output from the CB TLV-SI generator 122. The TLV packets and CB TLV-SI packets stored in the FIFO buffer 114 are output to the L1 symbol constructor 116, which constructs the L1 symbol. The L1ch through which the L1 symbol is transmitted may also be used for purposes such as reducing the PAPR (Peak to Average Power Ratio). The CB TLV-SI generator 122 outputs the CB TLV-SI packets so that the CB TLV-SI packets are transmitted at a transmission rate that does not affect the use of the L1ch.

[0058] The XMI packet transmission scheduler unit 120 outputs a multiplexed frame in which the XMI packets of each layer, the XMI packets of the LLch, the synchronization control XMI packets, and the stuff XMI packets are multiplexed into one system to the modulation device 20. Specifically, the XMI packet transmission scheduler unit 120 outputs one synchronization control XMI packet at the beginning of the OFDM frame. Then, the XMI packet transmission scheduler unit 120 outputs the XMI packets of each layer. After outputting all the XMI packets of each layer, the XMI packet transmission scheduler unit 120 outputs stuff XMI packets so that the number of XMI packets constituting the OFDM frame is constant. The data unit area of ​​the XMI packet of each layer is assigned an area for storing the L0 symbol and the L1 symbol (L0 symbol storage area, L1 symbol storage area). When an L0 symbol is input, the XMI packet transmission scheduler unit 120 quickly (with low delay) allocates the L0 symbol to the L0 symbol storage area of ​​the XMI packet of each layer, and when an L1 symbol is input, the XMI packet transmission scheduler unit 120 quickly (with low delay) allocates the L1 symbol to the L1 symbol storage area of ​​the XMI packet of each layer. In this way, the XMI packet transmission scheduler unit 120 can output LLch data to the modulation device 20 with low delay.

[0059] As described above, in this embodiment, the CB TLV-SI generating unit 122 outputs the CB TLV-SI packet including the CB control information to the TLV packetizing unit 112. In this manner, the CB TLV-SI generating unit 122 can multiplex the CB control information onto the data signal of the LL ch.

[0060] The XMI packets output from the XMI packet transmission scheduler unit 120 are input to the modulation device 20 via a wired line or a wireless line (Studio to Transmitter Link (STL) or Transmitter to Transmitter Link (TTL)).

[0061] Next, a configuration of a modulating device 20 as a transmitting device according to the present invention will be described. First, for comparison, a configuration of a conventional modulating device 20a that does not support CB transmission and performs MIMO transmission will be described with reference to FIG.

[0062] Fig. 4 is a diagram showing an example of the configuration of a conventional modulation device 20a. Fig. 4 shows the configuration of a modulation device 20 that supports MIMO transmission and MISO (Multiple Input Single Output) transmission. MISO transmission is a method in which a transmitting side simultaneously transmits information signals (streams) in the same frequency band using multiple transmitting antennas, and a receiving side receives the information signals transmitted from the multiple transmitting antennas using one receiving antenna.

[0063] The modulation device 20 shown in Fig. 4 includes an input I / F unit 201, an error correction coding unit 202, a bit interleaving unit 203, a mapping unit 204, a system separation unit 205, a pilot signal generating unit 206a, a TMCC information bit generating unit 207, a TMCC signal generating unit 208, layer synthesis units 209 and 210, time-frequency interleaving units 211 and 212, a MISO encoding unit 213, OFDM frame configuration units 214 and 215, and IFFT-GI adding units 216 and 217. The error correction coding unit 202, the bit interleaving unit 203, the mapping unit 204, and the system separation unit 205 are provided corresponding to each of the layers A, B, and C, but in Fig. 4, only the configuration corresponding to the layer A is shown for the sake of simplicity. The OFDM frame configuration unit 214 is an example of a first frame configuration unit. OFDM frame constructing section 215 is an example of a second frame constructing section.

[0064] The input I / F unit 201 receives a multiplexed frame obtained by multiplexing the XMI packets of each layer, the XMI packets of the LLch, the synchronization control XMI packets, and the stuff XMI packets into one system from the remultiplexing device 10. The input I / F unit 201 extracts the data signals of each layer from the input multiplexed frame and outputs them to the error correction coding unit 202 of the corresponding layer. The input I / F unit 201 extracts the data signals of the LLch from the input multiplexed frame and outputs them to the OFDM frame composition unit 214 and the OFDM frame composition unit 215. The input I / F unit 201 extracts TMCC information from the input multiplexed frame and outputs them to the pilot signal generation unit 206a and the TMCC information bit generation unit 207.

[0065] The error correction coding unit 202 performs error correction coding on the input data signal of layer A in units of FEC blocks, and outputs the result to the bit interleaving unit 203 .

[0066] The bit interleaving unit 203 performs bit-by-bit interleaving on the data string output from the error correction coding unit 202. An example of bit-by-bit interleaving is bit rotation, which blocks the bit string in a predetermined unit and changes the bit order within each block. The bit interleaving unit 203 outputs the interleaved data string to the mapping unit 204.

[0067] The mapping unit 204 maps the data sequence output from the bit interleaving unit 203 onto an IQ plane for each predetermined number of bits based on the modulation method of the corresponding layer, and performs carrier modulation. In this manner, the mapping unit 204 converts the data sequence into carrier symbols. The mapping unit 204 outputs the generated carrier symbols to the system demultiplexing unit 205.

[0068] The system separation unit 205 separates the input carrier symbols into two systems (a first system and a second system). When MIMO transmission is performed, the system separation unit 205 separates the input carrier symbols into two systems. The system separation unit 205 outputs the carrier symbols of the first system to the hierarchical combination unit 209, and outputs the carrier symbols of the second system to the hierarchical combination unit 210. In this way, the system separation unit 205 separates the data signals of each layer after error correction coding into the first system and the second system. When MISO transmission is performed, the system separation unit 205 outputs all carrier symbols to the hierarchical combination unit 209.

[0069] The pilot signal generating section 206 a generates a pilot signal to be incorporated into an OFDM frame based on the input TMCC information, and outputs the generated pilot signal to the OFDM frame configuring section 214 and the OFDM frame configuring section 215 .

[0070] The TMCC information bit generation unit 207 generates TMCC information bits based on the input TMCC information, and outputs the generated TMCC information bits to the TMCC signal generation unit 208. As described above, the TMCC information has a CB flag superimposed thereon, which indicates whether or not CB transmission is to be performed.

[0071] The TMCC signal generating section 208 generates a TMCC signal based on the TMCC information bits output from the TMCC information bit generating section 207 , and outputs the TMCC signal to an OFDM frame configuring section 214 and an OFDM frame configuring section 215 .

[0072] The hierarchical combining unit 209 hierarchically combines the carrier symbols (first system carrier symbols) output from the system separation unit 205 corresponding to each hierarchy, and outputs the result to the time-frequency interleaving unit 211. The hierarchical combining unit 210 hierarchically combines the carrier symbols (second system carrier symbols) output from the system separation unit 205 corresponding to each hierarchy, and outputs the result to the time-frequency interleaving unit 212.

[0073] The time-frequency interleaving unit 211 performs interleaving in the time direction and the frequency direction on the carrier symbols output from the hierarchical combining unit 209, and outputs the result to the OFDM frame constructing unit 214. The time-frequency interleaving unit 212 performs interleaving in the time direction and the frequency direction on the carrier symbols output from the hierarchical combining unit 210, and outputs the result to the OFDM frame constructing unit 215. As described above, when MIMO transmission is performed, the time-frequency interleaving unit 212 receives the carrier symbols from the system separation unit 205 as input. Therefore, when MIMO transmission is performed, the carrier symbols interleaved by the time-frequency interleaving unit 212 are input to the OFDM frame constructing unit 215.

[0074] When MISO transmission is performed, the MISO encoding unit 213 performs space-time coding (STBC (Space Time Block Coding) coding or SFBC (Space Frequency Block Coding) coding) on ​​the carrier symbols output from the time-frequency interleaving unit 211, and outputs the result to the OFDM frame configuration unit 215. When performing STBC coding, the MISO encoding unit 213 performs complex conjugation and sign inversion on a pair of two data symbols in the time direction. Also, when performing SFBC coding, the MISO encoding unit 213 performs complex conjugation and sign inversion on a pair of two data symbols in the frequency direction.

[0075] In this way, the output source for outputting carrier symbols to OFDM frame configuration section 215 is switched between when MIMO transmission is performed and when MISO transmission is performed. In conjunction with this switching, the output destination of carrier symbols from system demultiplexing section 205 is also switched.

[0076] The OFDM frame constructing unit 214 adds the LLch data signal, pilot signal, and TMCC signal to the input carrier symbols to construct an OFDM frame (first transmission frame) and outputs it to the IFFT / GI adding unit 216. The OFDM frame constructing unit 215 adds the LLch data signal, pilot signal, and TMCC signal to the input carrier symbols to construct an OFDM frame (second transmission frame) and outputs it to the IFFT / GI adding unit 217.

[0077] The IFFT / GI adding unit 216 performs IFFT and adds a GI to the OFDM frame output from the OFDM frame composing unit 214, and outputs the result to the transmitter 30p. The IFFT / GI adding unit 217 performs IFFT and adds a GI to the OFDM frame output from the OFDM frame composing unit 215, and outputs the result to the transmitter 30s.

[0078] FIG. 5 is a diagram showing an example of the configuration of the pilot signal generating unit 206a shown in FIG.

[0079] 5, the pilot signal generating unit 206a includes a Wi generating and pilot modulating unit 2061, a 1-system pilot pattern generating unit 2062, and a 2-system pilot pattern generating unit 2063. TMCC information is input to the Wi generating and pilot modulating unit 2061, the 1-system pilot pattern generating unit 2062, and the 2-system pilot pattern generating unit 2063.

[0080] The Wi generator / pilot modulator 2061 generates a predetermined bit sequence Wi, modulates the generated bit sequence Wi, for example, by BPSK (Binary Phase Shift Keying), and outputs the modulated bit sequence Wi to a 1-system pilot pattern generator 2062 and a 2-system pilot pattern generator 2063 .

[0081] The 1-system pilot pattern generating unit 2062 generates a predetermined pilot pattern from the bit sequence Wi output from the Wi generating & pilot modulating unit 2061 based on the TMCC information, and outputs it to the OFDM frame configuring unit 214 as a pilot signal (first pilot signal).

[0082] The 2-system pilot pattern generating unit 2063 generates a predetermined pilot pattern from the bit sequence Wi output from the Wi generating & pilot modulating unit 2061 based on the TMCC information, and outputs it as a pilot signal (second pilot signal) to the OFDM frame configuring unit 215. Here, the pilot pattern generated by the 2-system pilot pattern generating unit 2063 is, for example, a pattern orthogonal to the pilot pattern generated by the 1-system pilot pattern generating unit 2062. In this case, the second pilot signal is orthogonal to the first pilot signal.

[0083] Next, the configuration of a modulation device 20 as a transmission device according to the present invention will be described with reference to Fig. 6. In Fig. 6, the same components as those in Fig. 4 are given the same reference numerals, and the description thereof will be omitted.

[0084] The modulation device 20 shown in Fig. 6 includes an input I / F unit 201, an error correction coding unit 202, a bit interleaving unit 203, a mapping unit 204, a system demultiplexing unit 205, a pilot signal generating unit 206, a TMCC information bit generating unit 207, a TMCC signal generating unit 208, hierarchical synthesis units 209 and 210, time-frequency interleaving units 211 and 212, a MISO encoding unit 213, OFDM frame constructing units 214 and 215, and IFFT-GI adding units 216 and 217. The modulation device 20 shown in Fig. 6 differs from the modulation device 20a shown in Fig. 4 in that the pilot signal generating unit 206a is changed to a pilot signal generating unit 206.

[0085] When CB transmission is performed, the system separation unit 205 separates the input carrier symbols into two systems (a first system and a second system), outputs the carrier symbols of the first system to the hierarchical combination unit 209, and outputs the carrier symbols of the second system to the hierarchical combination unit 210.

[0086] When CB transmission is performed, pilot signal generating unit 206 outputs a first pilot signal to OFDM frame configuring unit 214 and OFDM frame configuring unit 215. In this way, when CB transmission is performed, pilot signal generating unit 206 outputs the same pilot signal to OFDM frame configuring unit 214 and OFDM frame configuring unit 215. When MIMO transmission is performed, pilot signal generating unit 206 outputs a first pilot signal to OFDM frame configuring unit 214 and outputs a second pilot signal to OFDM frame configuring unit 215. The second pilot signal is, for example, a signal orthogonal to the first pilot signal, but is not limited to this, and pilot signal generating unit 206 generates an appropriate pilot signal according to two polarizations used in MIMO transmission.

[0087] Fig. 7 is a diagram showing an example of the configuration of pilot signal generating section 206. In Fig. 7, the same components as those in Fig. 5 are given the same reference numerals, and the description thereof will be omitted.

[0088] As shown in Fig. 7, the pilot signal generating unit 206 includes a Wi generating / pilot modulating unit 2061, a 1-system pilot pattern generating unit 2062, a 2-system pilot pattern generating unit 2063, and a change-over switch 2064. The pilot signal generating unit 206 shown in Fig. 7 differs from the pilot signal generating unit 206a shown in Fig. 5 in that a change-over switch 2064 is added.

[0089] The changeover switch 2064 switches the connection destination of the OFDM frame configuration unit 215 between the 1-system pilot pattern generation unit 2062 and the 2-system pilot pattern generation unit 2063. Specifically, when the CB flag superimposed on the TMCC information is on (CB transmission is performed), the changeover switch 2064 connects the 1-system pilot pattern generation unit 2062 to the OFDM frame configuration unit 215. As a result, a pilot signal (first pilot signal) generated by the 1-system pilot pattern generation unit 2062 is input to the OFDM frame configuration unit 215. On the other hand, when the CB flag superimposed on the TMCC information is off (CB transmission is not performed), the changeover switch 2064 connects the 2-system pilot pattern generation unit 2063 to the OFDM frame configuration unit 215. As a result, a pilot signal (second pilot signal) generated by the 2-system pilot pattern generation unit 2063 is input to the OFDM frame configuration unit 215.

[0090] In the case of MIMO transmission using horizontally and vertically polarized waves, a first system of OFDM frames and a second system of OFDM frames are transmitted using horizontally and vertically polarized waves on one physical channel. Therefore, in order for the receiving side to demodulate the signal, the pilot signals of the two systems must be orthogonal. In the case of CB transmission, a first system of OFDM frames and a second system of OFDM frames are transmitted using two physical channels. Therefore, in order for the receiving side to demodulate the signal, the pilot signals of the two systems must be the same.

[0091] As in the present embodiment, by switching the pilot signal input to the OFDM frame configuration section 215 depending on whether CB transmission or MIMO transmission is performed, pilot signals suitable for each of MIMO transmission and CB transmission can be inserted into the OFDM frame with a simple configuration in which a changeover switch 2064 is added. Therefore, transmission and reception by MIMO transmission and CB transmission can be made possible with a simpler configuration.

[0092] Next, the configuration of a demodulation device 50 as a receiving device according to the present invention will be described. The demodulation device 50 according to this embodiment receives, via a receiver 40, a broadcast wave transmitted from a modulation device 20 as a transmitting device according to the present invention via a transmitter 30, and obtains data signals of each layer from the received signal. Fig. 8 is a diagram showing an example of the configuration of the demodulation device 50 according to this embodiment.

[0093] As shown in Fig. 8, the demodulation device 50 according to this embodiment includes tuners 501 and 502, GI removal and FFT units 503 and 504, OFDM frame synchronization units 505 and 506, TMCC demodulation units 507 and 508, pilot extraction units 509 and 510, channel estimation units 511 and 512, waveform equalization units 513 and 514, time-frequency deinterleaving units 515 and 516, LLch demodulation and error correction decoding units 517 and 518, a synthesis unit 519, an LLR (Log Likelihood Ratio) calculation and error correction decoding unit 520, an output unit 521, a CB transmission discrimination unit 522, a secondary channel discrimination unit 523, and a P / S synchronization unit 524. The LLR calculation and error correction decoding unit 520 is an example of a decoding unit. The secondary channel discrimination unit 523 is an example of a control unit. The CB transmission determining unit 522 is an example of a determining unit.

[0094] A reception signal of the receiver 40p that receives broadcast waves is input to the tuner 501 as a first tuner. The tuner 501 selects and acquires a signal of a specified physical channel from the input reception signal. The tuner 501 performs A / D conversion on the acquired signal, and outputs the A / D converted signal to the GI removal / FFT unit 503.

[0095] The GI removal / FFT unit 503 performs GI removal and FFT on the output signal of the tuner 501 , and outputs the obtained OFDM frame to the OFDM frame synchronization unit 505 .

[0096] The OFDM frame synchronization unit 505 outputs the OFDM frame output from the GI removal / FFT unit 503 to the TMCC demodulation unit 507 , pilot extraction unit 509 and LLch demodulation / error correction decoding unit 517 .

[0097] The TMCC demodulation unit 507 demodulates the TMCC signal allocated to the TMCC carrier from the OFDM frame output from the OFDM frame synchronization unit 505, and acquires the TMCC information included in the TMCC signal. In this manner, the TMCC demodulation unit 507 extracts the TMCC information from the signal received by the tuner 501. The TMCC demodulation unit 507 outputs the extracted TMCC information to the CB transmission discrimination unit 522. Furthermore, the TMCC demodulation unit 507 indicates the position of the pilot carrier to which the pilot signal is allocated, based on the extracted TMCC information.

[0098] The pilot extraction unit 509 extracts a pilot signal arranged on a pilot carrier instructed by the TMCC demodulation unit 507, from the OFDM frame output from the OFDM frame synchronization unit 505. The pilot extraction unit 509 outputs the extracted pilot signal to a channel estimation unit 511. In addition, the pilot extraction unit 509 outputs the OFDM frame input from the OFDM frame synchronization unit 505 to a waveform equalization unit 513.

[0099] The channel estimation unit 511 performs channel estimation using the pilot signal output from the pilot extraction unit 509 , and outputs the estimated value to the waveform equalization unit 513 .

[0100] Based on the estimated value output from the channel estimation unit 511, the waveform equalization unit 513 corrects (equalizes) the signal distortion generated in the transmission path for the OFDM frame output from the channel estimation unit 511, and outputs the equalized signal to the time-frequency deinterleaving unit 515.

[0101] The time-frequency deinterleaving unit 515 performs deinterleaving on the output signal of the waveform equalization unit 513 in a manner opposite to the interleaving performed by the time-frequency interleaving unit 211 of the modulation device 20 , and outputs the result to the combining unit 519 .

[0102] The LLch demodulation and error correction decoding unit 517 extracts the carrier on which the LLch data is allocated from the OFDM frame output from the OFDM frame synchronization unit 505, and demodulates the LLch data. The LLch demodulation and error correction decoding unit 517 performs error correction decoding on the demodulated signal to obtain the LLch data signal. As described with reference to FIG. 3, when CB transmission is performed, the CB TLV-SI packet is multiplexed on the LLch data. The LLch demodulation and error correction decoding unit 517 obtains the LLch data signal and the CB control information multiplexed on the LLch data signal. The LLch demodulation and error correction decoding unit 517 outputs the obtained LLch data signal to the output unit 521, and outputs the obtained CB control information to the secondary channel discrimination unit 523.

[0103] The operations of the tuner 502 as a second tuner, the GI removal and FFT unit 504, the OFDM frame synchronization unit 506, the TMCC demodulation unit 508, the pilot extraction unit 510, the channel estimation unit 512, the waveform equalization unit 514, the time-frequency deinterleaving unit 516, and the LLch demodulation and error correction decoding unit 518 are similar to those of the tuner 501, the GI removal and FFT unit 503, the OFDM frame synchronization unit 505, the TMCC demodulation unit 507, the pilot extraction unit 509, the channel estimation unit 511, the waveform equalization unit 513, the time-frequency deinterleaving unit 515, and the LLch demodulation and error correction decoding unit 517, except that the processing target is a received signal of the receiver 40s, and therefore a description thereof will be omitted. However, the TMCC demodulation unit 508 does not output the extracted TMCC information to the CB transmission discrimination unit 522. Furthermore, the LL channel demodulation and error correction decoding unit 518 does not output the CB control information to the secondary channel discrimination unit 523 .

[0104] The pilot extraction unit 509 and the channel estimation unit 511 constitute a first pilot processing unit 525 that extracts a pilot signal from a received OFDM frame (first transmission frame) and performs channel estimation using the extracted pilot signal. The pilot extraction unit 510 and the channel estimation unit 512 constitute a second pilot processing unit 526 that extracts a pilot signal from a received OFDM frame (second transmission frame) and performs channel estimation using the extracted pilot signal.

[0105] The combiner 519 combines the output signals of the time-frequency deinterleaving units 515 and 516 by performing processing opposite to that performed by the system deinterleaving unit 205 of the modulation device 20 , and outputs the result to the LLR calculation / error correction decoding unit 520 .

[0106] The LLR calculation / error correction decoding unit 520 calculates an LLR for each bit of the output signal of the combining unit 519, and performs error correction decoding of the output signal of the combining unit 519 using the calculated LLR to obtain a data signal of each layer. The LLR calculation / error correction decoding unit 520 outputs the obtained data signal of each layer to the output unit 521.

[0107] The output unit 521 outputs the data signals of each layer output from the LLR calculation and error correction decoding unit 520 and the LLch data signals output from the LLch demodulation and error correction decoding units 517 and 518 .

[0108] In CB transmission in MIMO-like mode, if there are no received signals of both the primary ch and secondary ch channels, the data signal of each layer cannot be demodulated. Therefore, when CB transmission in MIMO-like mode is performed, the CB control information is multiplexed onto the data signal of the LLch.

[0109] The CB transmission discrimination unit 522 refers to the CB flag superimposed on the TMCC information output from the TMCC demodulation unit 507, determines whether or not CB transmission is being performed in the physical channel received via the tuner 501, and outputs the result of the discrimination to the secondary ch discrimination unit 523. The CB transmission discrimination unit 522, for example, scans across the frequency bands of all physical channels, and during an initial scan to detect receivable channels, refers to the CB flag superimposed on the TMCC information and determines whether or not CB transmission is being performed in each physical channel. In this way, in this embodiment, by superimposing the CB flag indicating whether or not CB transmission is being performed on the TMCC information, the CB transmission discrimination unit 522 can determine whether or not CB transmission is being performed without demodulating the data signal of each layer or the data signal of the LL channel.

[0110] When the CB transmission discrimination unit 522 discriminates that CB transmission is being performed, the secondary channel discrimination unit 523 acquires, after the end of the initial scan, frequency information of the physical channel that forms a pair with the specified physical channel, etc. Specifically, the secondary channel discrimination unit 523 refers to the CB control information output from the LL channel demodulation and error correction decoding unit 517, and acquires frequency information of the two physical channels that form a pair constituting the CB transmission, etc.

[0111] When CB transmission is performed on a physical channel on which tuner 501 receives broadcast waves, secondary channel discrimination unit 523 starts tuner 502 and tunes the reception frequency of tuner 502 to the frequency of a physical channel paired with the physical channel received by tuner 501. In this way, it is possible to receive broadcast waves transmitted on both the primary channel and the secondary channel.

[0112] When CB transmission is performed on a physical channel that receives broadcast waves at tuner 501, secondary channel discrimination unit 523 synchronizes OFDM frame synchronization unit 505 with OFDM frame synchronization unit 506. As described above, broadcast waves are emitted at the same timing for the primary channel and the secondary channel. By synchronizing OFDM frame synchronization unit 505 with OFDM frame synchronization unit 506, it is possible to match the demodulation timing of the primary channel and the secondary channel.

[0113] If CB transmission discriminator 522 determines that CB transmission is not being performed, secondary channel discriminator 523 determines that MIMO transmission is being performed. If secondary channel discriminator 523 determines that MIMO transmission is being performed, it starts tuner 502 so as to receive a broadcast wave of the same physical channel as tuner 501.

[0114] Further, the secondary channel discrimination unit 523 controls the processing of the second pilot processing unit 526 depending on whether MIMO transmission or CB transmission is being performed. As described above, in the case of CB transmission, the second transmission frame includes a first pilot signal, and in the case of MIMO transmission, the second transmission frame includes a second pilot signal. Therefore, the secondary channel discrimination unit 523 controls the processing of the second pilot processing unit 526 so that processing suitable for the pilot signal included in the OFDM frame (extraction of the pilot signal and channel estimation) is performed depending on whether MIMO transmission or CB transmission is being performed.

[0115] As described above, in this embodiment, the modulation device 20 includes a system separation unit 205, a pilot signal generation unit 206, and OFDM frame configuration units 214 and 215. The system separation unit 205 separates the data signal after error correction coding into a first system and a second system. The pilot signal generation unit 206 generates and outputs a pilot signal. The OFDM frame configuration unit 214 adds a pilot signal to the data signal of the first system to configure a first transmission frame. The OFDM frame configuration unit 215 adds a pilot signal to the data signal of the second system to configure a second transmission frame. When CB transmission is performed, the pilot signal generation unit 206 inputs a first pilot signal to the OFDM frame configuration unit 214 and the OFDM frame configuration unit 215. When MIMO transmission is performed, the pilot signal generation unit 206 inputs the first pilot signal to the OFDM frame configuration unit 214 and the second pilot signal to the OFDM frame configuration unit 215.

[0116] In this way, by simply adding a simple configuration for switching pilot signals between CB transmission and MIMO transmission, it is possible to share a circuit configuration for CB transmission and MIMO transmission. Therefore, according to the present invention, transmission and reception by MIMO transmission and CB transmission are possible with a simpler configuration.

[0117] In the above-mentioned embodiment, an example is described in which audio and video data of each layer is remultiplexed and transmitted in the form of an XMI packet, but the present invention is not limited to this and can be applied to any method in which data of different layers is packetized and the packets of each layer are remultiplexed and transmitted. Therefore, the terms "XMI packet" and "XMI packetization" in the above-mentioned embodiment can be read as "remultiplexed packet" and "remultiplexing", respectively.

[0118] Although not specifically mentioned in the embodiments, a program for causing a computer to function as the modulation device 20 or the demodulation device 50 may be provided. The program may also be recorded in a computer-readable medium. The computer-readable medium can be used to install the program in a computer. Here, the computer-readable medium on which the program is recorded may be a non-transient recording medium. The non-transient recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

[0119] Alternatively, a chip may be provided that is configured with a memory that stores programs for executing each process performed by the modulation device 20 or demodulation device 50, and a processor that executes the programs stored in the memory, and is mounted on the modulation device 20 or demodulation device 50.

[0120] Although the above-mentioned embodiment has been described as a representative example, it is clear to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of the present invention. Therefore, the present invention should not be interpreted as being limited by the above-mentioned embodiment, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine multiple building blocks shown in the configuration diagram of the embodiment into one, or to divide one building block. [Explanation of symbols]

[0121] 1. Transmission and Reception System 10,10a remultiplexer 20,20a Modulation device 30, 30p, 30s transmitter 40,40p,40s receiver 50 Demodulator 101,108,121 Packet filters 102, 109, 110 IP header compression 103, 111, 112 TLV packetization unit 104,113,114 FIFO Buffers 105 FEC block component 106 Layered frame structure 107 XMI Packetizer 115 L0 symbol component 116 L1 symbol component 117 GPS Reference Signal Generator 118, 118a Synchronous control XMI packet configuration part 119 Staff XMI Packet Component 120,120a XMI packet sending scheduler 201 Input I / F section 202 Error correction coding unit 203 Bit Interleave Section 204 Mapping Section 205 System separation section 206, 206a Pilot signal generator 207 TMCC information bit generator 208 TMCC signal generation section 209,210 Hierarchical synthesis section 211,212 Time-frequency interleaving section 213 MISO encoder 214, 215 OFDM frame configuration section 216,217 IFFT·GI Addition Section 2061 Wi Generation and Pilot Modulation Section 2062 1st series pilot pattern generator 2063 2nd series pilot pattern generator 2064 Changeover switch 501,502 Tuner 503,504 GI removal / FFT section 505,506 OFDM frame synchronization section 507,508 TMCC demodulation section 509,510 Pilot Extraction Section 511,512 Channel Estimation Unit 513,514 Waveform equalization section 515,516 Time-frequency deinterleaving section 517,518 LLch demodulation and error correction decoding section 519 Synthesis Section 520 LLR calculation and error correction decoding unit 521 Output section 522 CB transmission discrimination unit 523 Secondary channel discrimination unit 524 P / S synchronization section 525 First Pilot Processing Unit 526 Second Pilot Processing Unit

Claims

1. A transmitting device capable of MIMO transmission in which a first transmission frame and a second transmission frame including data signals separated into two systems are transmitted in one physical channel using a first polarized wave and a second polarized wave, and a channel bonding transmission in which two physical channels are combined and transmitted, comprising: a system separation unit that separates the data signal after error correction coding into a first system and a second system; a pilot signal generating unit that generates and outputs a pilot signal; a first frame constructing unit that constructs the first transmission frame by adding a pilot signal output from the pilot signal generating unit to the data signal of the first system; a second frame constructing unit that constructs the second transmission frame by adding a pilot signal output from the pilot signal generating unit to the second system data signal, The pilot signal generating unit When the channel bonding transmission is performed, a first pilot signal is output to the first frame configuration unit and the second frame configuration unit; a transmitting device which, when performing the MIMO transmission, outputs the first pilot signal to the first frame configuration section and outputs the second pilot signal to the second frame configuration section.

2. 2. The transmitting device according to claim 1, a TMCC signal generating unit that generates a TMCC signal including TMCC information and outputs the generated TMCC signal to the first frame configuration unit and the second frame configuration unit; The TMCC information includes flag information indicating whether or not the channel bonding transmission is to be performed, The pilot signal generating unit determines whether or not to perform the channel bonding transmission based on the flag information.

3. A receiving device for receiving a first transmission frame and a second transmission frame including data signals separated into two systems, the first transmission frame and the second transmission frame being transmitted by MIMO transmission in which a first polarized wave and a second polarized wave are used for transmission in one physical channel, or by channel bonding transmission in which two physical channels are combined and transmitted, comprising: a first pilot processing unit that extracts a pilot signal from the received first transmission frame and performs channel estimation using the extracted pilot signal; a second pilot processing unit that extracts a pilot signal from the received second transmission frame and performs channel estimation using the extracted pilot signal; a combining unit that combines an equalized signal for the received first transmission frame based on the estimate of the first pilot processing unit and an equalized signal for the received second transmission frame based on the estimate of the second pilot processing unit; a decoding unit that decodes the signal obtained by the synthesis unit; a control unit that controls processing of the second pilot processing unit depending on whether the MIMO transmission or the channel bonding transmission is being performed.

4. 4. The receiving device according to claim 3, the first transmission frame and the second transmission frame include a TMCC signal including TMCC information; The TMCC information includes flag information indicating whether or not the channel bonding transmission is to be performed, A determination unit that determines whether the channel bonding transmission is being performed based on flag information superimposed on TMCC information included in the TMCC signal extracted from the first transmission frame, The control unit controls processing of the second pilot processing unit based on a result of the determination by the determination unit.

Images