KR101328166B1 - Apparatus and method for receiving broadcasting signal - Google Patents

Abstract

A method of receiving a broadcast signal including a plurality of transmission data is provided. A transmission frame including a plurality of transmission data and including a frame header including information on each of the plurality of transmission data is received and converted into a digital signal. The frame header information is read from the transmission frame, and at least one of the plurality of transmission data is output based on the frame header information.

Description

Receiving method and receiving apparatus for broadcast signal {APPARATUS AND METHOD FOR RECEIVING BROADCASTING SIGNAL}

The present invention relates to a method and apparatus for transmitting digital broadcast signals, a recording medium and a receiving apparatus. In particular, the present invention relates to a method and apparatus for transmitting a digital broadcast signal, a recording medium, and a receiving apparatus, each of which a plurality of services multiplexed in a time domain and a frequency domain in a transmission frame can be transmitted in different transmission forms.

According to the general digital broadcasting transmission system, various transmission modes can be provided by selecting various transmission modes, modulation levels, hierarchical modulation, and error correction codes. In this case, since a transmission mode, a modulation level, a hierarchical modulation, and an error correction code may be selected for an arbitrary radio frequency (RF) channel, different transmission modes, modulation levels, hierarchical modulation, and error correction codes may be selected according to RF channels. Can be selected.

However, all transmission frames transmitted over any RF channel commonly use transmission mode, modulation level, hierarchical modulation, and error correction codes determined corresponding to the corresponding RF channel, so that all transmission frames of the corresponding RF channel are There is a problem with the same transmission form.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method and apparatus for transmitting a digital broadcast signal, a recording medium, and a receiver, which may provide different types of transmissions according to a frequency domain and a time domain.

According to a feature of the present invention, a broadcast signal transmission method for transmitting a frame to provide a plurality of services includes the steps of: allocating one or more subbands of the frame to each of the plurality of services; Allocating at least one symbol interval of the frame for each of the plurality of services; Converting the frame into a frame in a time domain; Generating a frame header of a time domain including information on each of the plurality of services; and inserting the frame header into a frame of the time domain.

Here, the information on each of the plurality of services includes information on subbands and symbol intervals allocated for each of the plurality of services. In this case, the method may further include channel encoding each of the plurality of services, and the information on each of the plurality of services further includes information on a channel encoding level of each of the plurality of services.

The method may further include digitally modulating each of the plurality of services, and the information on each of the plurality of services further includes information on a modulation level of each of the plurality of services.

On the other hand, the recording medium according to the characteristics of the present invention can be read by a computer recording a program for realizing the broadcast signal transmission method on a computer.

The broadcast signal transmission apparatus for providing a plurality of services by transmitting a frame to another feature of the present invention includes an allocation unit for allocating at least one subband of the frame and at least one symbol interval of the frame corresponding to each of the plurality of services; An inverse Fourier transform unit for converting the frame into a frame in a time domain, a frame generator for generating a frame header in a time domain including information on each of the plurality of services, and a frame generator for inserting the frame header into a frame in the time domain Include.

Here, the information on each of the plurality of services includes information on the subband and symbol period of the frame to which each of the plurality of services is allocated. The apparatus may further include a plurality of channel encoders respectively corresponding to the plurality of services and channel encoding the corresponding services, and a digital modulation unit corresponding to the plurality of services, respectively, and digitally modulating the corresponding channel coded services. The information on each of the plurality of services may include information on channel coding levels of each of the plurality of services, and the information on each of the plurality of services may further include information on modulation levels of each of the plurality of services.

According to still another aspect of the present invention, a broadcast signal receiving apparatus for providing a plurality of services by receiving a frame transmitted from the outside may include a frame header determination unit determining whether to accept the frame according to a frame header of the frame; A Fourier transform unit for converting the frame allowing the frame header determination unit from the time domain to a frame in the frequency domain, a service selector for outputting at least one service of the frame in the frequency domain, and digitally converting each of the at least one service. A plurality of digital demodulator and a plurality of channel decoder for channel decoding each of the at least one digital demodulated service.

Here, the service selector recognizes a location of each of the at least one service from the frame header and outputs the at least one service. The digital demodulator recognizes information on the digital modulation level of each of the at least one service from the frame header and digitally demodulates each of the at least one service. The channel decoder may also decode each of the at least one service by recognizing information on a channel encoding level of each of the at least one service from the frame header.

According to the present invention, a plurality of services may be multiplexed in a frequency domain and a time domain in a transmission frame, and each of the plurality of services may be transmitted in different forms. Also, the receiving device may selectively receive only necessary services by using a frame header including information on each service in the frame header.

1 is a diagram schematically illustrating a structure of a transmission frame of a digital broadcast signal transmission method according to an embodiment of the present invention.
2 is a diagram illustrating an example of a transmission frame according to an embodiment of the present invention.
3 is a block diagram of a digital broadcast signal transmission apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a digital broadcast signal transmission method according to an embodiment of the present invention.
5 is a block diagram of a digital broadcast signal receiving apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating a digital broadcast signal receiving method according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

Hereinafter, a method and apparatus for transmitting a digital broadcast signal, a recording medium, and a receiver according to an embodiment of the present invention will be described.

1 is a diagram schematically illustrating a structure of a transmission frame of a digital broadcast signal transmission method according to an embodiment of the present invention.

As shown in FIG. 1, a transmission frame according to an embodiment of the present invention includes a frame header and a frame body.

The frame header is configured at the front of the transport frame and includes information indicating synchronization of the transport frame and information on each of a plurality of services multiplexed in the frame body (hereinafter, referred to as "service information"). In this case, the service information includes information about a transmission mode, a modulation level, a hierarchical modulation, and an error correction code. In addition, the frame header is transmitted as a signal in the time domain, so that the receiving device can quickly check the frame header information.

The frame body includes a plurality of services to be transmitted through a transmission frame, and includes K OFDM symbols (hereinafter, referred to as "symbols" in the time domain. In FIG. 1, "symbol 1, symbol 2, symbol 3,..."). , Divided into N subbands (shown as "subband 1, subband 2, subband 3, ..., subband N" in FIG. 1) in the frequency domain. With such K symbols and N subbands, each of the plurality of services can be multiplexed in the time domain and the frequency domain, and a frame body divided into K symbols is transmitted as a signal in the frequency domain.

2 is a diagram illustrating an example of a transmission frame according to an embodiment of the present invention. In FIG. 2, it is assumed that the frame bodies of the transmission frames TF1 and TF2 are divided into N subbands in the frequency domain and K symbols in the time domain.

2 shows a first transmission frame TF 1 and a second transmission of a first service S1, a second service S2, a third service S3, a fourth service S4, and a fifth service S5. The case of multiplexing on the frame TF 2 is illustrated as an example. Here, the first service S1, the second service S2, the third service S3, the fourth service S4, and the fifth service S5 represent different types of content for digital broadcasting. The amount of data transmission required for each of the plurality of services S1 to S5 differs depending on the type of service. In addition, a transmission mode, a modulation level, a hierarchical modulation, an error correction code, and the like for each of the plurality of services may be individually determined so that each of the plurality of services may be applied to a receiving apparatus having various structures.

First, multiplexing is performed on a transmission frame basis using size information of each of the plurality of services S1 to S5. That is, the first service S1 to the fourth service S4 are allocated to the first transmission frame TF1, and the fifth service S5 is assigned to the second transmission frame TF2.

As shown in FIG. 2, the frame body of the first transmission frame TF1 is divided into a first subband group, a second subband group, and a third subband group. In this case, the first service S1 is allocated to the first subband group, the second service S2 is assigned to the second subband group, and the third service S3 and the fourth service S4 are assigned to the third subband group. Assigned to a subband group. The first subband group and the second subband group are located in K symbols, respectively, in the third subband group, K symbols are divided into two, one is allocated to the third service S3, and the other is It is allocated to the fourth service S4.

That is, in the frame body of the first transmission frame TF1, the first service S1 is assigned to A subbands and K symbols, and the second service S2 is assigned to B subbands and K symbols. do. The third service S3 is allocated to C subbands and X symbols, and the fourth service S4 is allocated to C subbands and Y symbols. In this case, the sum of A, B, and C (A + B + C) is the number N of all subbands, and the sum of X and Y (X + Y) is the number K of all symbols.

In the case of low-capacity content such as the first service S1 to the fourth service S4, the content may be transmitted together in one transmission frame by multiplexing in a time and frequency domain.

On the other hand, if the content is a large amount of content, such as the second service frame TF2, such as the fifth service S5, it is also possible to multiplex to one transport frame TF2.

In this case, the first to fourth services may be low-capacity content that can be provided to the mobile phone, and the fifth service may be high-capacity content provided to a high definition (HD) television.

As described above, according to the digital broadcast signal transmission method according to an embodiment of the present invention, a plurality of different services having a low capacity can be multiplexed in a frequency domain and a time domain to be configured in one transmission frame. It is also possible to configure one service having a high capacity in one transmission frame.

In this case, the transport frame includes a frame header configured at the front end, and the frame header includes information on each of the plurality of services. The information on each of the plurality of services includes information on one or more subbands and one or more symbols in which each of the plurality of services is located. Since the frame header is transmitted as a signal in the time domain, the receiving apparatus may check information included in the frame header to selectively receive only necessary transmission frames or to selectively decode only necessary services in the received transmission frames.

Next, a digital broadcast signal transmission apparatus and a transmission method according to an embodiment of the present invention will be described.

3 is a block diagram of a digital broadcast signal transmission apparatus according to an embodiment of the present invention, and FIG. 4 is a flowchart illustrating a digital broadcast signal transmission method according to an embodiment of the present invention. 3 illustrates only a part of a digital broadcast signal transmission apparatus necessary for describing an embodiment of the present invention.

As shown in FIG. 3, the apparatus for transmitting digital broadcast signals according to an embodiment of the present invention includes M channel encoder 310, M digital modulator 320, allocation unit 330, and inverse Fourier transform ( An inverse fast fourier transform (IFFT) unit 340, a frame generator 350, and a digital / analog (D / A) transform unit 360 are included.

The channel encoder 310 performs channel encoding on digital data (hereinafter, referred to as "service data") regarding M services according to the requirements of the corresponding service (S410). In this case, the channel coding method includes RS (Reed-Solomon) coding, convolution coding, trellis coding, turbo coding, low density parity check (LDPC) coding, or a concatenation of two or more of them. Concatenated encoding may be used.

The M digital modulators 320 digitally modulate the channel-coded service data output from the M channel encoders 310 (S420). Here, quadrature phase shift keying (QPSK), differential QPSK (DQPSK), 16QAM, 32QAM, 64QAM, 128QAM, 256QAM, etc. may be used as the digital modulation method.

The allocator 330 allocates one or more subbands and one or more symbols to digitally modulated service data output by the M digital modulators 320, respectively (S430). Here, the allocator 330 generates information on each of the M pieces of service data and applies the information to the frame generator 350. In this case, the information on each of the M services may include information on a location corresponding to each of the M services, information on a transmission mode, information on a channel coding level, information on a digital modulation level, information on a hierarchical modulation level, and the like. It may include. The information on the location of each of the M services is information about one or more subbands and one or more symbols allocated to each of the M services.

The inverse fast fourier transform (IFFT) transformer 340 converts the signal in the frequency domain of the M service data output from the subband allocator 330 into a signal in the time domain (S440).

The frame generation unit 350 performs time division multiplexing on the time-domain signal of the time domain output from the inverse Fourier (IFFT) converter 340. That is, the frame generator 350 generates a plurality of symbol periods as a frame body of one transmission frame (S450).

The frame generator 350 generates a frame header including information on each of the M services (S460). In this case, the frame header may have a structure for synchronizing the transmission frame or may include information for synchronizing the transmission frame.

The D / A converter 360 converts the transmission frame of the digital signal output by the frame generator 350 into an analog signal, and transmits the transmission frame converted into the analog signal to the receiving apparatus (S470).

As described above, according to the digital broadcast signal transmission apparatus and transmission method according to an embodiment of the present invention, one or more subbands and one or more symbols are allocated to each of the M services. In this way, a plurality of services multiplexed in the frequency domain and the time domain can be configured in the frame body of the transmission frame. In addition, the frame header including information on at least one service configured in the frame body, the frame header is transmitted as a signal in the time domain, after configuring at least one service to generate a frame header of the transmission frame, Information on the subband and symbol where each service is located may be configured in the frame header.

Next, a digital broadcast signal receiving apparatus and a receiving method according to an embodiment of the present invention will be described.

5 is a block diagram of a digital broadcast signal receiving apparatus according to an embodiment of the present invention, and FIG. 6 is a flowchart illustrating a digital broadcast signal receiving method according to an embodiment of the present invention. 5 shows only a part of a digital broadcast signal receiving apparatus required to describe an embodiment of the present invention.

As shown in FIG. 5, an apparatus for receiving a digital broadcast signal according to an embodiment of the present invention includes an analog / digital (A / D) converter 510, a frame header determiner 520, and a Fourier transform. : FFT) unit 530, service selector 540, P digital demodulator 550, and P channel decoder 560.

The A / D converter 510 converts the received analog signal into a digital signal (S610).

The frame header determiner 520 recognizes the structure or information indicating the synchronization of the transmission frame from the digital signal output from the A / D converter 510, confirms the position of the frame header, and determines the information configured in the frame header. (S620).

In this case, the frame header determination unit 520 does not apply the transmission frame to the Fourier transform (FFT) unit 530 if all services configured in the frame body of the transmission frame are not applicable to the reception apparatus.

On the other hand, if at least one service configured in the frame body of the transmission frame is applicable to the receiving apparatus, the frame header determination unit 520 applies the transmission frame to the Fourier transform (FFT) unit 530.

The Fourier transform (FFT) unit 530 converts the transmission frame in the time domain into a signal in the frequency domain (S640).

The service selector 540 selects one or more services to be provided by the receiving apparatus in the transmission frame of the frequency domain output by the Fourier transform (FFT) unit 530 (S650). In this case, the service selector 540 recognizes a subband and a symbol section in which the selected service is located by using information about a service configured in the frame header. In addition, the service selector 540 outputs at least one selected service in service units. Hereinafter, it is assumed that the service selector 540 outputs P services.

The P digital demodulator 550 digitally demodulates each of the P services output from the service selector 540 by using information on the modulation level of each of the P services included in the frame header.

The P channel decoders 560 channel decode the digital demodulated services output by the P digital demodulators 550, respectively, using information on the channel coding levels of the P services included in the frame header. (S670).

As described above, the apparatus and method for receiving a digital broadcast signal according to an embodiment of the present invention includes receiving a transmission frame including a plurality of services multiplexed in a frequency and time domain, and using the information configured in the frame header, Only necessary services can be selectively received.

The embodiments of the present invention described above are not only implemented by the apparatus and method but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (6)

In the method for receiving a broadcast signal including a plurality of transmission data,
Receiving a transmission frame including a plurality of transmission data and including a frame header including information about each of the plurality of transmission data, and converting the transmission frame into a digital signal;
Reading the frame header information from the transmission frame, and
Outputting at least one of the plurality of transmission data based on the frame header information
Including;
The frame header is located in front of a frame body containing the plurality of transmission data.
Method of receiving broadcast signal. The method of claim 1,
The information on the plurality of transmission data includes at least one of position information of each transmission data, information on a transmission mode, information on a channel coding level, information on a digital modulation level, and information on a hierarchical modulation level. How to receive the signal. 3. The method of claim 2,
The location information of each transmission data includes information on one or more subbands and one or more symbols allocated to each transmission data. In the receiving device for receiving a broadcast signal including a plurality of transmission data,
An AD converter including a plurality of transmission data and receiving a transmission frame including a frame header including information on each of the plurality of transmission data and converting the transmission frame into a digital signal;
A frame header determiner for reading the frame header information from the transmission frame, and
Transmission data selection unit for outputting at least one of the plurality of transmission data based on the frame header information
Including;
The frame header is located in front of a frame body containing the plurality of transmission data.
Broadcast signal receiving device. 5. The method of claim 4,
The information on the plurality of transmission data includes at least one of position information of each transmission data, information on a transmission mode, information on a channel coding level, information on a digital modulation level, and information on a hierarchical modulation level. Signal receiving device. The method of claim 5,
The location information of each transmission data includes information on one or more subbands and one or more symbols allocated to each transmission data.

Images