KR102163746B1 - Transmitting apparatus and receiving apparatus and signal processing method thereof - Google Patents

Abstract

The transmitting device is started. The transmitting device generates a frame by mapping data included in the input stream to at least one signal processing path, and creates a frame cluster by clustering a preset number of frames, and provides signaling information to the signaling region of the frame. An information insertion unit to be inserted and a transmission unit to transmit a frame into which signaling information is inserted, and the signaling information may include profile information and duration information for different types of frames included in the frame cluster.

Description

Transmitting device, receiving device and its signal processing method {TRANSMITTING APPARATUS AND RECEIVING APPARATUS AND SIGNAL PROCESSING METHOD THEREOF}

The present invention relates to a transmission apparatus, a reception apparatus, and a signal processing method thereof, and more particularly, to a transmission apparatus, a reception apparatus, and a signal method thereof for transmitting data by mapping data to at least one signal processing path.

In the information society of the 21st century, broadcasting and communication services are entering the era of full-scale digitalization, multi-channelization, broadband and high-quality. In particular, as the spread of high-definition digital TVs, PMPs, and portable broadcasting devices has recently increased, there is an increasing demand for supporting various reception methods for digital broadcasting services.

In response to these demands, the standard group has established various standards to provide a variety of services that can satisfy users' needs. Therefore, a search for a plan to provide better services through better performance is requested.

The present invention was conceived in accordance with the above-described necessity, and an object of the present invention is to construct a stream so as to transmit various types of service data, and to generate and transmit signaling information corresponding thereto. In providing.

According to an embodiment for achieving the above object, the transmission device generates a frame by mapping data included in an input stream to at least one signal processing path, and creates a frame cluster by clustering a preset number of frames. And a frame generator for inserting signaling information into a signaling region of the frame, and a transmitter for transmitting a frame into which the signaling information is inserted, wherein the signaling information includes different types included in the frame cluster Profile information and duration information for the frame of may be included.

In addition, a preset number of frame clusters and FEF parts constitute a super frame, and the signaling information includes information on the number of frame clusters in the super frame, duration information of the FEF part, profile information of the current frame, and index information of the current frame. It may further include.

In addition, the index information of the current frame may include at least one of index information on the number of total frames constituting the super frame and index information on the number of frames having the same profile within the super frame.

In this case, the different types of frames may include at least two types of frames among mobile type frames, fixed type frames, and MIMO type frames.

In addition, the signaling region of the frame may be a region transmitting L1 signaling.

Meanwhile, the receiving device according to an embodiment of the present invention includes a receiving unit for receiving a stream including a frame cluster in which frames including signaling information and data mapped to at least one signal processing path are clustered in units of a preset number, A signaling processing unit for extracting the signaling information from the received stream, and a signal processing unit for signal processing the frame cluster based on the extracted signaling information, and the signal processing unit includes different types included in the frame cluster The frame cluster may be processed based on signaling information including profile information and duration information for the frame of.

Here, the signaling information may include profile information and duration information of different types of frames included in the frame cluster for each frame.

Alternatively, the signaling information may include profile information of different types of frames included in the frame cluster for each frame, and duration information for each profile.

Alternatively, the signaling information includes: duration information of the current frame, first information about a time difference between the first symbol of the first frame and the first symbol of the current frame having the same profile as the current frame among the following frames, and a profile different from the current frame of the next frame It may include at least one of second information about a time difference between the first symbol of the first frame and the first symbol of the current frame.

In addition, the signal processing unit may select and process only a frame having the same profile as the current frame by using the duration information and the first information of the current frame when the service data of the required type is included in the current frame. .

In addition, the signal processing unit may skip a frame having the same profile as the current frame by using the duration information and the second information of the current frame and process the signal when the service data of the required type is not included in the current frame. I can.

Meanwhile, in the signal processing method of the transmitting device according to an embodiment of the present invention, a frame cluster is generated by mapping data included in an input stream to at least one signal processing path, and clustering a preset number of frames. Generating, inserting signaling information into a signaling region of the frame, and transmitting a frame into which the signaling information is inserted, wherein the signaling information includes different types of frames included in the frame cluster Profile information and duration information for are included.

In addition, a preset number of frame clusters and FEF parts constitute a super frame, and the signaling information includes information on the number of frame clusters in the super frame, duration information of the FEF part, profile information of the current frame, and index information of the current frame. It may further include.

Here, the index information of the current frame may include at least one of index information on the total number of frames constituting the super frame and index information on the number of frames having the same profile within the super frame.

Further, the different types of frames may include at least two types of frames among mobile type frames, fixed type frames, and MIMO type frames.

In addition, the signal processing method of the receiving device according to an embodiment of the present invention includes a stream including a frame cluster in which frames including signaling information and data mapped to at least one signal processing path are clustered in units of a preset number. Receiving, extracting the signaling information from the received stream, and signal processing the frame cluster based on the extracted signaling information, wherein the signal processing step is included in the frame cluster. The frame cluster may be processed based on signaling information including profile information and duration information for different types of frames.

Here, the signaling information includes profile information and duration information of each of at least one frame included in the frame cluster for each frame, or includes profile information of each of at least one frame included in the frame cluster for each frame And, duration information may be included for each profile.

Alternatively, the signaling information includes: duration information of the current frame, first information about a time difference between the first symbol of the first frame and the first symbol of the current frame having the same profile as the current frame among the following frames, and a profile different from the current frame of the next frame It may include at least one of second information about a time difference between the first symbol of the first frame and the first symbol of the current frame.

In this case, in the signal processing step, when the service data of the required type is included in the current frame, only a frame having the same profile as the current frame is selected using the duration information and the first information of the current frame to process the signal. I can.

In addition, in the signal processing step, when the required type of service data is not included in the current frame, the frame having the same profile as the current frame is skipped using the duration information and the second information of the current frame to process the signal. can do.

As described above, according to various embodiments of the present invention, when transmitting various types of service data, a transmission band can be efficiently used and an area occupied by signaling information can be minimized, so that a frame structure can be improved.

1 is a block diagram showing the configuration of a transmission device according to an embodiment of the present invention.
Fig. 2 is a block diagram for explaining the configuration of a transmission-side DVB-T2 system.
3 is a block diagram illustrating a configuration for generating signaling information according to an embodiment of the present invention.
4A to 4D are diagrams illustrating a unit structure of a transmission frame according to an embodiment of the present invention.
5A to 5C are diagrams illustrating various implementation examples of L1 signaling.
6 is a block diagram showing the configuration of a receiving device according to an embodiment of the present invention.
7 is a block diagram illustrating in detail a signal processing unit according to an embodiment of the present invention.
8 is a block diagram showing a configuration of a signaling processing unit according to an embodiment of the present invention.
9 is a flowchart illustrating a signal processing method of a transmission device according to an embodiment of the present invention.
10 is a flowchart illustrating a signal processing method of a reception device according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings. Further, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

1 is a block diagram showing the configuration of a transmission device according to an embodiment of the present invention. According to FIG. 1, the transmission device 100 includes a frame generation unit 110, an information insertion unit 120, and a transmission unit 130.

The frame generator 110 generates a frame by mapping data included in the input stream to at least one signal processing path. As an embodiment, the present transmission device applies the PLP concept to enable provision of various broadcast services having different modulation schemes, channel coding rates, times, and cell interleaving lengths, respectively, to one broadcast channel.

Here, PLP means a signal path that is independently processed. That is, each service (e.g., video, extended video, audio, data stream, etc.) can be transmitted and received through a plurality of RF channels, and the PLP is a path through which these services are transmitted or data transmitted through the path. It is the containing stream. Further, the PLP may be located in slots distributed with temporal intervals on multiple RF channels, or may be distributed with temporal intervals on one RF channel. That is, one PLP may be distributed and transmitted on one RF channel or a plurality of RF channels at a time interval.

The PLP structure is composed of Input mode A that provides one PLP and Input mode B that provides multiple PLPs. In particular, if Input mode B is supported, it is possible to provide a robust specific service as well as distributed transmission of one stream. By increasing the time interleaving length, a time diversity gain can be obtained. In addition, when only a specific stream is received, the receiver is powered off for the rest of the time, so it can be used with low power, which is suitable for providing portable and mobile broadcasting services.

Here, time diversity is to reduce the deterioration of the transmission quality due to an error occurring at a continuous time in the mobile communication transmission path, and if the transmitting side transmits the same signal several times at a certain time interval, the receiving side sends the received signals again. It is a technology to obtain good transmission quality by synthesizing.

In addition, transmission efficiency can be improved by including information that can be transmitted in common to a plurality of PLPs in one PLP, and this PLP is called a common PLP, and the other PLPs except the common PLP transmit data. This PLP is called a data PLP.

That is, the frame generator 110 generates a frame by mapping data included in the input stream to at least one signal processing path, and performs signal processing for each path. For example, signal processing includes Input Stream Synchronization, Delay Compensation, Null packet deletion, CRC Encoding, Header Insertion, and Coding. , Interleaving, and modulation may include at least one process. Frames signal-processed for each path are generated as one transmission frame together with signaling information, and the generated transmission frame is transmitted to a receiving device (not shown).

In particular, the frame generator 110 may cluster and configure a preset number of frames. Hereinafter, a cluster of a preset number of frames is referred to as a frame cluster.

In this case, a preset number of frame clusters and FEF parts may constitute a super frame. Here, since the super frame and the FEF part are the same as defined in DVB-T2, detailed descriptions will be omitted.

Specifically, the super frame includes a preset number (NFC) of frame clusters, and may additionally include an FEF part, and each frame cluster may include a preset number of frames (NF). In this case, each frame included in the frame cluster may be a different type of data. That is, each frame may have a different profile. Here, the profile indicates a data type included in a frame, and may indicate at least one of a base (or fixed) type, a mobile type, a MIMO type, and an MISO type, but is not limited thereto.

In addition, all frame clusters in the super frame may have the same structure. For example, a plurality of frame clusters constituting one super frame may have the same frame profile sequence and frame duration sequence. That is, each frame cluster may have the same duration. Here, the frame profile sequence (hereinafter, the profile sequence) means that the profiles of the frames constituting the frame cluster are sequentially listed, and SP _F = {P _F (0), P _F (1),...P _F ( It can be in the same form as N _F -1)}. In addition, the frame duration sequence (hereinafter, the duration sequence) means that the durations of the frames constituting the frame cluster are sequentially arranged.ST _F = {T _F (0), T _F (1),..., T _F (N _F -1)}. In this case, the duration of the frame cluster may be calculated as T _FC = T _F (0) + T _F (1) + ... + T _F (N _F -1). Also, the duration of the super frame T _FC = N _FC × T _FC + (N _FC /I _FC )× T _FEF Can be calculated as Here, I _FC means the number of frame clusters existing between two FEF parts.

The meaning that the plurality of frame clusters constituting one super frame have the same profile and duration sequence means that the first frame cluster has SPF = {A, B, B, A, B, B,.., A, B, B If the profile sequence is the same as }, it means that the remaining frame clusters are also configured to have the same profile sequence. That is, when the first frame cluster has a structure in which A type frames, B type frames, and B type frames are repeatedly arranged, it means that the remaining frame clusters also have the same structure.

Also, a frame having the same profile may have the same duration within a super frame. Accordingly, when a plurality of frame clusters constituting one super frame have the same profile sequence, they have the same duration sequence.

Meanwhile, the number IFC of frame clusters present between two FEF parts is a factor of the number of frame clusters constituting a super frame NFC, and may be configured to have the same value in all super frames, but is not limited thereto.

The information insertion unit 120 inserts signaling information into the signaling region of the frame.

Here, the signaling information may be an L1 (Layer 1) signaling signal that transmits an L1 signal for a series of processes required to extract service data from an RF signal, including a frame synchronization acquisition process, and the configurable field ( A configurable field) and a dynamic field may be included, and the signaling region may be a P2 symbol for frame synchronization. A signaling region may be added to the beginning of a frame to generate a transmission signal. As an embodiment, in a DVB-T2 system, a unit of a transmission frame to which a P1 symbol and a signaling region are added to a frame is referred to as a T2 frame.

The P2 symbol may be divided into a pre-signaling information area and a post-signaling information area. In addition, the post signaling region may include a configurable field and a dynamic field.

The symbols P1 and P2 are terms in the DVB-T2 example, and the P1 symbol is a symbol indicating the start of a frame, and the P2 symbol may be understood as a symbol including a signaling region. As another embodiment, the start of a frame may be indicated using one preamble symbol including a signaling region.

Meanwhile, the signaling information inserted into the signaling region according to an embodiment of the present invention may include profile information and duration information for different types of frames included in the frame cluster.

For example, profile information and duration information of different types of frames included in the frame cluster may be included for each frame.

As another example, profile information of different frames included in a frame cluster may be included for each frame, and duration information may be included for each profile.

In addition, the signaling information may include information on the number of frame clusters and duration information of the FEF part in the super frame.

In addition, the signaling information may include profile information of the current frame and index information of the current frame.

Here, the index information on the current frame may include at least one of index information on the total number of frames constituting the super frame and index information on the number of frames having the same profile in the super frame.

Meanwhile, information (or parameters) maintained unchanged for the entire duration of one super frame may be inserted into the configurable field, and information specific to the current frame may be inserted into the dynamic field.

Specifically, information on the number of frame clusters within a super frame (NFC), information on the number of frames constituting a frame cluster (NF), profile information on a frame, frame duration information, duration information of the FEF part (TFEF), and two FEFs The number of frames information (IFC) between parts may be inserted into the configurable field.

For example, information on the number of frame clusters (N _FC ) in a super frame is 8 bits (2 to 255), information on the number of frames constituting a frame cluster (N _F ) is 7 bits (1 to 128), and a frame profile sequence SP _F is 4*N _F bits (assuming that the number of profiles is less than 16), frame duration sequence is 22*N _F bits (assuming that the same OFDM parameters as DVB-T2 are used), FEF part duration T _FEF (DVB-T2 Assuming that the same OFDM parameter is used) is 25 bits, and the number of frame clusters I _FC between FEF parts may be inserted using 8 bits (0 to 255), but is not limited thereto.

In addition, profile information of the current frame, index information of the current frame, information about the duration of the current frame, and the like may be inserted into the dynamic field.

For example, the profile information of the current frame, Frame_type, is 4 bits, the index IDX _F of the current frame for all frames constituting the super frame is 8 bits (0 to 255), and has the same profile among all frames constituting the super frame. The index IDX _F (i) of the current frame for the frame may be inserted using 8 bits (0 to 255), but is not limited thereto.

The transmitter 130 transmits a frame into which signaling information is inserted. The transmission device 100 may transmit service data to the reception device (not shown) together with the above-described signaling information including location and size information of the data.

Specifically, the transmission unit 130 may transmit data through each cell of an OFDM symbol. Some OFDM symbols may perform various functions such as transmission of the L1 signaling field, signal detection, frame opening and closing, etc. This is not related to the present invention, so a detailed description thereof will be omitted.

2 is a block diagram for explaining the configuration of a DVB-T2 transmission system on which the present invention is based.

Referring to FIG. 2, the DVB-T2 transmission system 1000 may include an input processor 1100, a BICM encoder 1200, a frame builder 1300, and a modulator 1400.

In that the DVB-T2 transmission system 1000 has the same content as defined in DVB-T2, one of the European digital broadcasting standards, each configuration will be schematically described. For more information, please refer to "Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2)".

The input processor 1100 generates a baseband frame (BBFRAME) from an input stream for data to be serviced. Here, the input stream may be MPEG-2 Transport Stream (TS), Generic Stream (GS), or the like.

The BICM encoder 1200 performs encoding according to the FEC code determined according to the amount of transmission required by the data to be serviced, the transmission quality, the area to be transmitted (Fixed PHY Frame or Mobile PHY Frame), and the configuration of the network, and the interleaving method and signal constellation. do. The signaling information on the data to be serviced may be encoded through a separate BICM encoder (not shown) depending on implementation, or may be encoded by sharing the BICM encoder 1200 with data to be serviced.

The frame builder 1300 and modulator 1400 configure a frame by determining an OFDM parameter for a signaling region and an OFDM parameter for a region in which data to be serviced is to be transmitted, and generate a frame by adding a sync region. Further, modulation for modulating the generated frame into an RF signal is performed, and the RF signal is transmitted to a receiver.

Meanwhile, the frame generation and information insertion described in FIG. 1 may be performed by the frame builder 1300.

3 is a block diagram illustrating a configuration for generating signaling information according to an embodiment of the present invention.

Referring to FIG. 3, an input processor 1100 and a BICM encoder 1200 are shown. The input processor 1100 may include a scheduler 1110. The BICM encoder 1200 includes an L1 signaling generator 1210, an FEC encoder 1220-1 and 1220-2, a bit interleaver 1230-2, a demux 1240-2, and a constellation mapper 120-1, 1250. -2) may be included. The BICM encoder 1200 may further include a time interleaver (not shown). In addition, the L1 signaling generator 1210 may be included in the input processor 1100.

Each of the n service data is mapped to PLP0 to PLPn. The scheduler 1110 determines positions, modulation and code rates for each PLP in order to map several PLPs to the physical layer of T2. That is, the scheduler 1110 generates L1 signaling information. In some cases, the scheduler 1110 may output dynamic field information among L1 post signaling information of the current frame to the frame builder 1300. Also, the scheduler 1110 may transmit the L1 signaling information to the BICM encoder 1200. The L1 signaling information includes L1 pre signaling information and L1 post signaling information.

The L1 signaling generator 1210 differentiates and outputs the L1 pre-signaling information and the L1 post signaling information. The FEC encoders 1220-1 and 1220-2 perform FEC encoding including shortening and puncturing on the L1 pre-signaling information and the L1 post-signaling information, respectively. The bit interleaver 1230-2 performs interleaving on the encoded L1 post signaling information in bit units. The demux 1240-2 controls the robustness of bits by adjusting the order of the bits constituting the cell, and outputs a cell including bits. The two constellation mappers 1250-1 and 1250-2 map cells of L1 pre-signaling information and L1 post-signaling information to a constellation, respectively. The L1 pre-signaling information and the L1 post-signaling information processed through the above-described process are output to the frame builder 1230. Accordingly, the L1 pre-signaling information and the L1 post-signaling information can be inserted into the frame.

4A to 4D are diagrams illustrating a unit structure of a transmission frame according to an embodiment of the present invention.

As shown in FIG. 4A, an input processing module in which an input stream is processed as an L1 packet may operate at a data pipe level.

4A shows a process in which an input stream is processed as an L1 packet. A plurality of input streams 411 to 413 are processed by data pipes 421 to 423 for a plurality of L2 packets through an input pre-processing process. , Data pipes 421 to 423 for a plurality of L2 packets are encapsulated into data pipes 431 to 433 for a plurality of L1 packets through an input processing process, and are scheduled as transmission frames (FIGS. 3 and 1110). Here, the L2 packet may be of two types: a fixed stream such as a transport stream (TS) stream and a variable stream such as a general stream encapsulation (GSE) stream.

4B is a diagram for describing a local frame structure for each PLP.

As shown in FIG. 4B, the L1 packet 430 includes a header, a data field, and a padding field.

The L1 packet 430 is processed as an L1 FEC packet 440 by adding parity 432 through the FEC encoding process.

The L1 FEC packet 440 is processed as an FEC block 450 through bit interleaving and constellation mapping, a plurality of FEC blocks are processed as a time interleaving block 460, and a plurality of time interleaving blocks are interleaved frames 470 Will constitute. In this case, cell interleaving may be applied in the process of configuring the interleaving block 460.

4C is a diagram for explaining the structure of an interleaving frame.

Referring to FIG. 4C, the interleaving frame 410 may be transmitted through different transmission frames 481, 482, and 483, and a plurality of transmission frames and FEF parts may form one super frame 490. .

However, according to the present invention, a plurality of transmission frames constituting one super frame may be grouped into a predetermined number (eg, N _F ) to form a frame cluster. That is, the plurality of frame clusters 491, 492, 493, and 494 and the FEF parts 495 and 496 may constitute a super frame.

On the other hand, each cluster frame constituting the super frame is a preset number N _F Four frames 492-1, 492-2, 492-3... may be included.

In FIGS. 4B and 4C, a time interleaving block and an interleaving frame are expressed in a structure having a clear boundary by assuming a block-type time interleaver. However, when a continuous time interleaver is used, the boundary may not be clear. For example, an example of a continuous time interleaver is a convolution interleaver.

4D is a diagram for explaining the structure of a transmission frame.

As shown, one transmission frame 492-1 consists of a P1 symbol 10 indicating the start position of the frame, a P2 symbol 20 transmitting an L1 signal, and a data symbol 30 transmitting data. Can be.

The P1 symbol 10 is located at the first part of the transmission frame 492-1, and may be used to detect the start point of the T2 frame 500 and transmit a small amount of information. For example, the P1 symbol 10 may transmit 7 bits of information.

The P2 symbol 20 is located after the P1 symbol 10 of the T2 frame 500. One transmission frame 492-1 may include a plurality of P2 symbols 20 according to the FFT size. The P2 symbol 20 includes L1 pre-signaling information 21 and L1 post-signaling information 23. The L1 pre-signaling information 21 provides basic transmission parameters including parameters required for reception and decoding of the L1 post signaling.

The L1 post signaling information 23 includes a configurable field 23-1 and a dynamic field 23-2. In addition, the L1 post signaling information 23 may optionally include an extension field 23-3. Further, although not shown in the drawing, the L1 post signaling information 23 may further include a CRC field and an L1 padding field, if necessary.

Meanwhile, according to an embodiment of the present invention, information (or parameters) maintained unchanged for the entire duration (TSF) of one super frame is inserted into the configurable field, and information specific to the current frame is inserted into the dynamic field. Can be inserted.

Specifically, information on the number of frame clusters within a super frame (NFC), information on the number of frames constituting a frame cluster (NF), profile information on a frame, frame duration information (TF), duration information of the FEF part (TFEF), Frame number information (IFC) between the two FEF parts may be inserted into the configurable field.

In addition, profile information of the current frame, index information of the current frame, and the like may be inserted into the dynamic field.

Meanwhile, according to an embodiment of the present invention, data after generating and arranging a preamble symbol including information for detecting a start point of a frame and channel adaptation and L1 signaling information simultaneously performing the roles of a P1 symbol and a P2 symbol Frames can be constructed by placing symbols.

5A to 5C are diagrams illustrating various implementation examples of L1 signaling.

In FIGS. 5A to 5C, for convenience of explanation, it is assumed that three profiles, that is, three types of data, are transmitted. In this case, 2 bits can be used to indicate the profile type. For example, 00 may indicate a profile A (eg, a base profile), 01 may indicate a profile B (eg, a mobile profile), 10 may indicate a profile C (eg, a MIMO profile), and 11 may indicate a reserve area.

According to the implementation example illustrated in FIG. 5A, L1 signaling may include all information necessary for signal processing, that is, all information on frames constituting a frame cluster.

That is, as shown, the frame time, the number of frame clusters N _FC , the number of frames constituting the frame cluster N _F , the profile P _F (i) and the duration T _F (i) for each frame, the duration T _FEF of the FEF part, for the number I _FC, IDX index _F of the current frame for the entire frame, the frames of the same type of frame cluster between FEF part may include an index IDX _F information of the current frame.

Meanwhile, according to the configuration shown in FIG. 5A, L1 signaling may include profile and duration information for each frame for each frame. For example, L1 signaling may sequentially include profile and duration information for the first frame F1, and may sequentially include profile and duration information for the second frame F2.

FIG. 5B shows a modified example of the configuration shown in FIG. 5A, and even in the implementation example shown in FIG. 5B, L1 signaling may include all information necessary for signal processing.

According to FIG. 5B, unlike the configuration shown in FIG. 5A, L1 signaling includes profile information for each frame and may include duration information corresponding to each profile type. For example, in the L1 signaling, profile information for each frame may be included for each frame, and duration information may be included for each profile, not for each frame.

According to another implementation example illustrated in FIG. 5C, L1 signaling may include only some information on frames constituting a frame cluster.

That is, as shown, the duration T _F for the current frame, information on the time difference between the first symbol of the first frame and the first symbol of the current frame, which have the same profile as the current frame among the following frames, T _{NF , SP} , T _{NF , DP} And information T _{NF and DP} on the time difference between the first symbol of the first frame and the first symbol of the current frame, which have a different profile from the current frame among the following frames.

6 is a block diagram showing the configuration of a receiving device according to an embodiment of the present invention.

Referring to FIG. 6, the receiving device 200 includes a receiving unit 210, a signaling processing unit 220, and a signal processing unit 230.

The receiver 210 receives an RF signal including a frame cluster in which a unit frame including signaling information and data mapped to at least one signal processing path is clustered in units of a preset number. Here, the signaling information may include profile information for different types of frames included in the frame cluster and duration information for the frame.

Specifically, the signaling information may include profile information and duration information of different types of frames included in the frame cluster for each frame.

Alternatively, the signaling information may include profile information of each frame of different types included in the frame cluster for each frame, and may include duration information for each profile.

In addition, the signaling information includes first information about a time difference between the first symbol of the first frame having the same profile as the current frame among the next frames and the first symbol of the current frame, and the first symbol of the first frame having a profile different from the current frame among the next frames. And second information on a time difference between the first symbol of the current frame.

In an embodiment of the present invention, when the sync area and the signaling area are separated, the receiver 210 demodulates the received RF signal according to the OFDM parameter, performs sync detection, and when the sync is detected, stored in the sync area. It is recognized whether the frame currently received from the signaling information is a frame including necessary service data. For example, it is possible to recognize whether a mobile frame is received or a fixed frame is received.

In this case, if OFDM parameters for the signaling region and the data region are not predetermined, OFDM parameters for the signaling region and data region stored in the sync region are obtained, and the signaling region and the data region immediately following the sync region are obtained. Demodulation may be performed by obtaining OFDM parameter information.

In another embodiment of the present invention, when the sync area and the signaling area are not separated, the receiving unit 210 demodulates the received RF signal according to an OFDM parameter, performs sync detection, and performs a signal processing unit ( 220). The signaling processing unit 220 processes the demodulated OFDM cells to recognize whether the currently received frame is a frame including necessary service data. For example, it is possible to recognize whether a mobile frame is received or a fixed frame is received.

The signaling processing unit 220 extracts signaling information from the received frame. In particular, the signaling processor 220 may extract the L1 signaling and analyze the extracted L1 signaling to obtain profile information for a frame included in the frame cluster and duration information for the frame. To this end, the signaling processing unit 220 may perform demodulation by detecting P1 and P2 symbols, and then extract and decode a data block including L1 signaling. In another embodiment of the present invention, the signaling processor 220 may detect and demodulate a preamble symbol, and then extract and decode a data block including L1 signaling.

The signal processing unit 230 may signal-process the frame cluster based on the extracted signaling information. For example, signal processing may perform demodulation, frame de-builder, BICM decoding, and input de-processing.

Specifically, the signal processing unit 230 provides service data required for the current frame, that is, if there is service data selected by the user of the receiving device 200 based on profile information for the frame and duration information for the frame included in the signaling information. The stream can be processed by performing decoding on all or specific PLPs, and moving to the next frame when there is no service data required in the current frame.

For example, in the signaling information, duration information of the current frame, first information about a time difference between the first symbol of the first frame and the first symbol of the current frame, which has the same profile as the current frame, and a profile different from the current frame among the next frames Branches will be described on the assumption that second information about the time difference between the first symbol of the first frame and the first symbol of the current frame is included.

In this case, the signal processing unit 230 may process a signal by selecting only a frame having the same profile as the current frame by using the duration information and the first information of the current frame when the required type of service data is included in the current frame. .

In addition, when the current frame does not contain the service data of the required type, the signal processing unit 230 may process the signal by skipping the frame having the same profile as the current frame by using the duration information and the second information of the current frame. have. Here, the above-described process is repeated until a frame including the required type of service data is detected, and when the required type of service data is included in the current frame, the current frame and the current frame using the duration information and the first information of the current frame Only frames with the same profile can be selected for signal processing.

7 is a block diagram illustrating in detail a signal processing unit according to an embodiment of the present invention.

Referring to FIG. 7, the signal processing unit 230 includes a demodulator 231, a decoder 232 and a stream generator 233.

The demodulator 231 demodulates the received signal, generates a value corresponding to each LDPC codeword, and outputs it to the decoder 232. In this case, the demodulator 231 may perform decoding by acquiring parameters such as a modulation method for data stored in each data region using signaling information. In addition, the demodulator 231 may calculate a location of required data based on data information included in the configurable field and the dynamic field. That is, it is possible to calculate from which position in the frame the required PLP is transmitted.

The decoder 232 decodes necessary data. In this case, the decoder 232 may perform decoding by obtaining an FEC method parameter for data stored in each data region using signaling information.

The stream generator 233 may generate data to be serviced by processing a BB frame received from the decoder 232.

For example, the stream generator 233 may generate an L2 packet from an error-corrected L1 packet based on an ISSY mode, a BUFS, a TTO value, an ISCR value, etc. provided by the signaling processing unit 220.

Specifically, the stream generator 233 may include de-jitter buffers, and the de-jitter buffers are accurate for restoring the output stream based on the ISSY mode, BUFS, TTO value, and ISCR value provided by the signaling processing unit 220. You can recreate the timing. Accordingly, a delay for synchronization between a plurality of PLPs may be compensated.

8 is a block diagram showing a configuration of a signaling processing unit according to an embodiment of the present invention.

Referring to FIG. 8, the signaling processing unit 220 includes a demodulator 221, a mux 222, a deinterleaver 223, and a decoder 224.

The demodulator 221 receives and demodulates the signal transmitted from the transmission device 100. Specifically, the demodulator 221 demodulates the received signal to generate a value corresponding to the LDPC codeword, and outputs it to the mux 222.

In this case, the value corresponding to the LDPC codeword may be expressed as a channel value for the received signal. Here, there may be various methods for determining the channel value, and for example, may be a method for determining a Log Likelihood Ratio (LLR) value.

Here, the LLR value may be expressed as a value obtained by taking a log in a ratio of a probability that a bit transmitted from the transmission device 100 is 0 and a probability of 1. Alternatively, the LLR value may be a bit value itself determined according to a hard decision, and the LLR value is a representative value determined according to a section to which the probability that the bit transmitted from the transmitting device 100 is 0 or 1 belongs. It could be.

The mux 222 multiplexes the output value of the demodulator 221 and outputs it to the deinterleaver 223. Here, the output value of the demodulator 221 is a value corresponding to the LDPC codeword and may be, for example, an LLR value.

Specifically, the mux 222 is a component corresponding to the demux (Fig. 3, 1240-2) provided in the transmission device 100, and reversely performs the demultiplexing operation performed by the demux 1240-2 can do. That is, the mux 222 converts a value corresponding to the LDPC codeword output from the demodulator 221 in parallel-to-serial, and multiplexes the value corresponding to the LDPC codeword.

The deinterleaver 223 deinterleaves the output value of the mux 222 and outputs it to the decoder 224.

Specifically, the deinterleaver 223 is a component corresponding to the interleaver (Fig. 3, 1230-2) provided in the transmission device 100, and reversely performs the operation performed by the interleaver (Fig. 3, 1230-2). can do. That is, the deinterleaver 223 may perform deinterleaving on a value corresponding to the LDPC codeword to correspond to the interleaving operation performed in the interleaver (Figs. 3, 1230-2). Here, the value corresponding to the LDPC codeword may be an LLR value, for example.

The decoder 224 is a component corresponding to the FEC encoder 1220-2 provided in the transmission device 100 and may reversely perform an operation performed by the FEC encoder 1220-2. Specifically, the decoder 224 may output signaling information, that is, L1 signaling, by performing decoding based on the deinterleaved LLR value.

9 is a flowchart illustrating a signal processing method of a transmission device according to an embodiment of the present invention.

According to the signal processing method of the transmission device shown in FIG. 9, first, a frame is generated by mapping data included in an input stream to at least one signal processing path, and a frame cluster is generated by clustering a preset number of frames. (S910).

Subsequently, signaling information is inserted into the signaling region of the frame (S920).

Thereafter, a frame into which signaling information is inserted is transmitted (S930).

Here, the signaling information may include profile information and duration information for different types of frames included in the frame cluster.

In addition, a preset number of frame clusters and FEF parts constitute a super frame, and the signaling information further includes information on the number of frame clusters in the super frame, duration information of the FEF part, profile information of the current frame, and index information of the current frame. Can include.

In this case, the index information of the current frame may include at least one of index information on the total number of frames constituting the super frame and index information on the number of frames having the same profile in the super frame.

10 is a flowchart illustrating a signal processing method of a reception device according to an embodiment of the present invention.

According to the signal processing method of the reception device shown in FIG. 10, a stream including a frame cluster in which frames including signaling information and data mapped to at least one signal processing path are clustered in a predetermined number unit is received (S1010). ).

Subsequently, signaling information is extracted from the received stream (S1020).

Thereafter, the frame cluster is signal-processed based on the extracted signaling information (S1030).

Here, in step S1030, the frame cluster may be processed based on signaling information including profile information for different types of frames included in the frame cluster and duration information for the frame.

In this case, the signaling information includes profile information and duration information of different types of frames included in the frame cluster for each frame, or profile information of different types of frames included in the frame cluster for each frame. And, duration information may be included for each profile.

Alternatively, the signaling information includes duration information of the current frame, first information about a time difference between the first symbol of the first frame and the first symbol of the current frame, which has the same profile as the current frame, and a profile different from the current frame of the next frame. The branch may include at least one of second information on a time difference between the first symbol of the first frame and the first symbol of the current frame.

In this case, in step S1030, when service data of a required type is included in the current frame, only a frame having the same profile as the current frame is selected and signal-processed using the duration information and the first information of the current frame. When a necessary type of service data is not included, a frame having the same profile as that of the current frame may be skipped and processed using the duration information and the second information of the current frame.

As described above, according to various embodiments of the present invention, when transmitting various types of service data, a transmission band can be efficiently used and an area occupied by signaling information can be minimized, so that a frame structure can be improved.

Meanwhile, a non-transitory computer readable medium in which a program for sequentially performing a signal processing method according to the present invention is stored may be provided.

The non-transitory readable medium refers to a medium that stores data semi-permanently and can be read by a device, not a medium that stores data for a short moment, such as a register, cache, or memory. Specifically, the above-described various applications or programs may be provided by being stored in a non-transitory readable medium such as a CD, DVD, hard disk, Blu-ray disk, USB, memory card, and ROM.

In addition, although a bus is not shown in the above-described block diagram of the transmitting device and the receiving device, communication between components in the transmitting device and the receiving device may be performed through a bus. In addition, each device may further include a processor such as a CPU or microprocessor that performs the various steps described above.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

100: transmitting device 110: frame generator
120: information insertion unit 130: transmission unit
200: receiving device
210: receiver 220: signaling processing unit
230: signal processing unit

Claims (20)

In the transmission device,
A frame generator for generating a super frame including a plurality of frames;
An information insertion unit for inserting signaling information into the super frame; And
Includes; a transmitter for transmitting a frame including the signaling information,
Data types of at least two of the plurality of frames are the same,
The data types of the at least two frames are different from the data types of the other frames,
The at least two frames include first and second frames,
The signaling information,
Including information on a time difference between the first symbol of the first frame and the first symbol of the third frame among the remaining frames,
When the service type required by the receiving device is not included in the first frame, the information on the time difference is used by the receiving device to skip the second frame. The method of claim 1,
The signaling information,
And further comprising frame number information, profile information of a current frame, and index information of a current frame within the super frame. The method of claim 2,
Index information of the current frame,
And at least one of index information on the total number of frames constituting the super frame and index information on the number of frames having the same profile within the super frame. The method of claim 1,
The different types of frames,
A transmitting apparatus comprising at least two of a mobile type frame, a fixed type frame, and a MIMO type frame. The method of claim 1,
The transmitting apparatus, wherein the signaling information is L1 signaling information. A receiver configured to receive signaling information and a super frame including a plurality of frames;
A signaling processor for extracting the signaling information from the super frame; And
Includes; a signal processing unit for processing the plurality of frames based on the extracted signaling information,
Data types of at least two of the plurality of frames are the same,
The data types of the at least two frames are different from the data types of the other frames,
The at least two frames include first and second frames,
The signaling information,
Including information on a time difference between the first symbol of the first frame and the first symbol of the third frame among the remaining frames,
The signal processing unit,
When a required service type is not included in the first frame, the receiving device skips the second frame by using information on the time difference. The method of claim 6,
The signaling information,
And the profile information and duration information of different types of frames included in the super frame, for each frame. The method of claim 6,
The signaling information,
And including profile information of each frame of a different type included in the super frame for each frame, and including duration information for each profile. delete delete delete In the signal processing method of the transmission device,
Generating a super frame including a plurality of frames;
Inserting signaling information into the super frame; And
Transmitting a frame including the signaling information; Including,
Data types of at least two of the plurality of frames are the same,
The data types of the at least two frames are different from the data types of the other frames,
The at least two frames include first and second frames,
The signaling information,
Including information on a time difference between the first symbol of the first frame and the first symbol of the third frame among the remaining frames,
When the service type required by the receiving device is not included in the first frame, the information on the time difference is used by the receiving device to skip the second frame. The method of claim 12,
The signaling information,
And further comprising frame number information, profile information of a current frame, and index information of a current frame within the super frame. The method of claim 13,
Index information of the current frame,
And at least one of index information on the total number of frames constituting the super frame and index information on the number of frames having the same profile within the super frame. The method of claim 12,
The different types of frames,
A signal processing method comprising at least two of a mobile type frame, a fixed type frame, and a MIMO type frame. In the signal processing method of the receiving device,
Receiving a super frame including signaling information and a plurality of frames;
Extracting the signaling information from the super frame; And
Including; processing the plurality of frames based on the extracted signaling information,
Data types of at least two of the plurality of frames are the same,
The data types of the at least two frames are different from the data types of the other frames,
The at least two frames include first and second frames,
The signaling information,
Including information on a time difference between the first symbol of the first frame and the first symbol of the third frame among the remaining frames,
The step of processing the plurality of frames,
When a required service type is not included in the first frame, the second frame is skipped by using information on the time difference. The method of claim 16,
The signaling information,
Profile information and duration information of each of at least one frame included in the super frame are included for each frame, or profile information of each of at least one frame included in the super frame is included for each frame, and duration information of each profile A signal processing method comprising each. delete delete delete

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