KR20120096694A - Apparatus and method for determining guard interval in broadcasting communication system - Google Patents

Abstract

PURPOSE: A method and an apparatus for determining a protection section in a broadcasting communication system are provided to prevent waste of unnecessary resource by a protection section by setting the protection section length of a physical layer having respectively different system parameters. CONSTITUTION: A transmitter determines a protection section proportion of a physical layer by using FFT(Fast Fourier Transform) size and protection section rate of a standard physical layer section(207). The transmitter determines protection section length of a standard physical layer section(209). The transmitter adds the protection section of the determined length to a symbol included in each physical layer section(211).

Description

Apparatus and method for determining protection interval in broadcasting communication system {APPARATUS AND METHOD FOR DETERMINING GUARD INTERVAL IN BROADCASTING COMMUNICATION SYSTEM}

The present invention relates to a broadcast communication system, and more particularly, to an apparatus and method for setting a guard interval in a broadcast communication system.

Broadcast communication systems include digital audio broadcasting (DAB), digital video broadcasting (DVB), digital multimedia broadcasting (DMB), and the like using digital transmission technology.

The digital video broadcasting communication system (DVB system) is a European digital broadcasting technology, and is a transmission standard for supporting digital multimedia services not only digital broadcasting but also mobile and portable. That is, the DVB system can multiplex broadcasting data based on Moving Picture Experts Group2-Transport Stream (MPEG2-TS) and transmit an IP (Internet Protocol) based data stream.

In addition, the DVB system may transmit multiplexing data streams according to various services into one IP stream. In this case, the user demultiplexes the IP stream provided from the transmitting end of the DVB system into a data stream according to an individual service. Thereafter, the user demodulates the data stream according to the individual service, and outputs the demodulated data to the screen. In this case, the user needs information on what kinds of services are provided in the DVB system, what contents are included in each service, and the like.

The second generation terrestrial DVB broadcasting communication system (DVB-T2 system: Digital Video Broadcasting System for a Second Generation Terrestrial System) has one system parameter during the frame period. Accordingly, the robustness and efficiency characteristics of the DVB-T2 system are fixed as long as system parameters do not change. However, when implementing the DVB broadcasting communication system in a mobile receiving environment, the fixed robustness and efficiency characteristics of the DVB-TS2 system are inadequate for a large number of users in different receiving environments (eg, different moving speeds). . Therefore, there is a need for an alternative for supporting various users in different reception environments in a broadcasting system.

Accordingly, an object of the present invention is to provide an apparatus and method for supporting various users in different communication environments in a broadcast communication system.

Another object of the present invention is to provide an apparatus and method for providing a plurality of physical layer regions to which different system parameters are applied in a broadcast communication system.

It is still another object of the present invention to provide an apparatus and method for providing a multi-physical layer frame composed of a plurality of physical layer regions to which different system parameters are applied in a broadcast communication system.

Another object of the present invention is to provide an apparatus and method for setting a guard interval (GI) of each physical layer region in a broadcast communication system supporting multiple physical layer region frames.

Another object of the present invention is to provide an apparatus and method for setting the same guard interval (GI) length of physical layer regions in a broadcast communication system supporting multiple physical layer region frames.

Another object of the present invention is to provide an apparatus and method for determining a guard interval setting ratio of each physical layer region so that the guard interval (GI) length of the physical layer regions is the same in a broadcast communication system supporting multiple physical layer region frames. In providing.

Another object of the present invention is an apparatus for determining the guard interval setting ratio of each physical layer region using the guard interval setting ratio confirmed by the P1 symbol at the receiving end of a broadcast communication system supporting multiple physical layer region frame and In providing a method.

According to a first aspect of the present invention for achieving the objects of the present invention, a broadcast communication system for transmitting a frame including a plurality of physical layer regions consisting of a first physical layer region and at least one second physical layer region A method for transmitting a signal at a transmitting end may include determining a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region, and using an FFT size and a guard interval ratio of the first physical layer region. And determining a guard interval length of the second physical layer region.

According to a second aspect of the present invention, there is provided an apparatus for receiving a signal at a receiving end of a broadcast communication system transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region. The method may include determining a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region, and protecting the second physical layer region by using an FFT size and a guard interval ratio of the first physical layer region. And obtaining a section length.

According to a third aspect of the present invention, an apparatus for transmitting a signal in a broadcast communication system for transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region, A guard interval determiner configured to determine a guard interval ratio between the first physical layer region and the second physical layer region to determine a guard interval length between the first physical layer region and the second physical layer region; And at least one physical layer region generator for adding a guard interval having a guard interval length determined in step S to the signals of the first physical layer region and the second physical layer region.

According to a fourth aspect of the present invention, an apparatus for receiving a signal in a broadcast communication system for transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region, Determine a guard interval length of the first physical layer region by checking a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region, and use the FFT size and guard interval ratio of the first physical layer region. A guard interval checker for confirming a guard interval length of the second physical layer region and at least one guard interval of the length checked by the guard interval checker from the first physical layer region signal and the second physical layer region signal; And a physical layer domain analyzer.

As described above, by setting the same guard interval length of physical layer regions having different system parameters in a broadcast communication system supporting multiple physical layer region frames, an unnecessary waste of resources can be prevented in the guard interval. There is this.

In addition, by checking the guard interval setting ratios of all physical layer regions through the reference ratio included in the P1 symbol, there is an advantage of reducing the overhead due to transmission of control information.

1 is a diagram illustrating a frame structure of a broadcast communication system according to an embodiment of the present invention;
2 is a diagram illustrating a procedure for setting a guard interval in a transmitting end of a broadcast communication system according to an embodiment of the present invention;
3 is a diagram illustrating a procedure for setting a guard interval in a transmitting end of a broadcast communication system according to another embodiment of the present invention;
4 is a diagram illustrating a guard interval in a frame of a broadcast communication system according to an embodiment of the present invention;
5 is a diagram illustrating a procedure for detecting a signal at a receiving end of a broadcasting communication system according to an embodiment of the present invention;
6 is a diagram illustrating a procedure for detecting a signal at a receiving end of a broadcasting communication system according to another embodiment of the present invention;
7 is a block diagram of a transmitter in a broadcast communication system according to the present invention; and
8 is a block diagram of a receiving end in a broadcasting communication system according to the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, the present invention describes a technique for supporting various users in different communication environments in a broadcast communication system.

1 illustrates a frame structure of a broadcast communication system according to an embodiment of the present invention.

Referring to FIG. 1, a frame of the broadcast communication system includes a plurality of physical layer regions 110, 111, and 112 and a preamble 120. In the following description, it is assumed that the frame includes an area 0 (110), an area 1 (111), and an area 2 (112).

The physical layer areas 110, 111, and 112 are areas for transmitting broadcast data or control information. Here, the control information includes information necessary for receiving at the receiving end broadcast data transmitted through the physical layer areas 110, 111, and 112 at the transmitting end.

The physical layer regions 110, 111, and 112 are composed of a Data_Physical Zone (DATA_PZ) and a Closing Symbol_Physical Zone (CS_PZ). In this case, the physical layer area 0 110 further includes the P2 area 130. Here, DATA_PZ represents an area for transmitting broadcast service data, and CS_PZ represents an area including a plurality of pilot symbols for channel estimation as the last OFDM symbol of the corresponding physical layer area. The P2 area 130 is an area including signaling data. For example, the P2 region 130 includes physical region information 131 and a data map 132. Here, the physical area information 131 includes system parameter information of the physical layer areas 110, 111, and 112. For example, the system parameter information includes characteristic information about the physical layer regions 110, 111, and 112, such as the number of subcarriers, a multi-antenna technique, a guard interval length, and the like. The data map 132 includes locations of the physical layer regions 110, 111, and 112, physical layer configuration information, physical layer pipe (PLP) allocation information, data stream allocation information, and the like. Accordingly, the receiving end receives the desired data by decoding the region allocated to the user by using the signaling data of the P2 region 130.

The broadcast communication system may provide a plurality of broadcast services using the plurality of physical channel regions 110, 111, and 112. That is, the region ₀ 110, the region ₁ 111, and the region ₂ 112 may provide different broadcast services. In addition, each of the regions 110, 111, and 112 may include a plurality of different broadcast services. At this time, each broadcast service is classified into a PLP in a corresponding region.

Moreover, the physical layer regions 110, 111, and 112 are subject to different physical layer system parameters. Accordingly, the broadcast communication system may optimize physical layer system parameters according to various reception environments such as stop receivers, pedestrian receivers, and mobile receivers using the physical layer regions 110, 111, and 112. For example, the area ₀ 110 may be configured as a system for mobile users, the area ₁ 111 as a system for pedestrian users, and the area ₂ 112 as a system for stationary users. Here, the physical layer system parameters include fast fourier transform (FFT) size, pilot position, and guard interval information. The physical layer regions 110, 111, and 112 are divided into a first physical layer region and a second physical layer region. The first physical layer region may be a reference for setting a guard interval of the second physical layer region. Therefore, hereinafter, the first physical layer region may be referred to as a reference physical layer region.

The preamble 120 is located at the forefront of the time axis in the frame and is used for synchronization acquisition of the receiver. The preamble 120 is commonly referred to as a P1 symbol. For example, the preamble 120 includes FFT size and guard interval information of the region ₀ 110 including the P2 region 130. For another example, the preamble 120 includes FFT size and guard interval information of a reference physical layer region. In this case, the reference physical layer region may or may not include the P2 region 130. The reference physical layer region may be a physical layer region having the largest FFT size or a physical layer region having the smallest FFT size. In addition, the reference physical layer region may be located at the front or the rear of the plurality of physical layer regions. Also, the reference physical layer region may be at any position other than the front or the rear of the plurality of physical layer regions. In this case, a separate indicator for notifying the location of the reference physical layer region may be necessary.

As described above, when configuring a multi-physical layer region frame, the transmitting end may set different FFT size and guard interval information of each physical layer region. In this case, the guard period represents an area inserted at the front of each symbol to remove the inter-symbol interference by the multi-path.

2 illustrates a procedure for setting a guard interval in a transmitting end of a broadcast communication system according to an embodiment of the present invention.

Referring to FIG. 2, the transmitter determines whether it supports multiple physical layer area services in step 201. That is, the transmitter checks whether the broadcast communication system supports the multi-physical layer region frame configured as shown in FIG.

If the multi-physical layer area service is not supported, the transmitting end terminates the present algorithm.

On the other hand, when supporting the multi-physical layer area service, the transmitting end proceeds to step 203 to confirm the delay spread (delay spread).

In step 205, the transmitter determines the guard interval ratio of the reference physical layer region, which is a physical layer region that is a reference for setting the guard interval in consideration of the maximum delay spread. In this case, the transmitter determines the guard interval ratio such that the guard interval of the reference physical layer region is larger than the maximum delay spread. For example, in FIG. 1, the transmitter determines a region ₀ 110 including a P2 region 130 as a reference physical layer region. Accordingly, the transmission terminal determines the guard interval ratio of the area ₀ (110) in consideration of the FFT size and the maximum delay spread in the area ₀ (110). Here, the guard interval ratio indicates the ratio of the FFT size and the length of the guard interval. For example, the guard interval ratio includes 19/256, 19/128, 1/128, 1/32, 1/16, 1/8, and 1/4. In the following description, the guard interval ratio of the reference physical layer region is referred to as a reference ratio.

After determining the reference ratio, the transmitter proceeds to step 207 to determine the guard interval ratio of each physical layer region using the FFT size and the guard interval ratio of the reference physical layer region. For example, the transmitter calculates the guard interval ratio of each physical layer region such that the product of the FFT size and the guard interval ratio of the reference physical layer region is equal to the ratio of the FFT size and the guard interval of each physical layer region. If, in FIG. 4, the FFT size is 2K and the area 0 400 having the guard interval ratio 1/4 (402) is the reference physical layer area, the guard interval ratio of the area 1 410 having the FFT size of 4K is The guard interval ratio of region 2 420 having 1/8 (412) and an FFT size of 8K is 1/16 (422).

After determining the guard interval ratio of the physical layer regions, the transmitter proceeds to step 209 to determine the guard interval length of each physical layer region using the guard interval ratio of the physical layer regions.

After determining the guard interval length of the physical layer regions, the transmitter proceeds to step 211 and adds the guard interval of the length determined in step 209 to a symbol included in each physical layer region. For example, the transmitter adds a guard interval to each symbol of each physical layer region according to the guard interval length of each physical layer region determined in step 209.

In step 213, the transmitting end transmits a frame including a plurality of physical layer regions. In this case, when the reference physical layer region includes the P2 region, the preamble (P1 symbol) of the frame includes FFT size and guard interval ratio information of the reference physical layer region.

In the above-described embodiment, the transmitting end determines the physical layer region including the P2 region as the reference physical layer region.

In another embodiment, the transmitting end may determine the physical layer region having the smallest FFT size as the reference physical layer region. In this case, the preamble (P1 symbol) of the frame should include information on the FFT size and the guard interval ratio of the physical layer region including the reference physical layer region and the P2 region.

According to another embodiment, the transmitting end may determine the physical layer region having the largest FFT size as the reference physical layer region. In this case, the preamble (P1 symbol) of the frame should include information on the FFT size and the guard interval ratio of the physical layer region including the reference physical layer region and the P2 region.

According to another embodiment, the transmitting end may determine, as the reference physical layer region, the physical layer region at the front or rearmost regardless of the FFT size. In this case, the preamble (P1 symbol) of the frame should include information on the FFT size and the guard interval ratio of the physical layer region including the reference physical layer region and the P2 region.

In another embodiment, the transmitting end may determine a physical layer region located at an arbitrary position as a reference physical layer region regardless of the FFT size. In this case, the preamble (P1 symbol) of the frame should include information on the FFT size and the guard interval ratio of the physical layer region including the reference physical layer region and the P2 region. In this case, the position of the reference physical layer region existing at an arbitrary position may be set in advance in the transmission / reception period or may be indicated by the transmitting end.

As described above, the transmitter determines the guard interval ratio of each physical layer region such that the product of the FFT size and the guard interval ratio of the reference physical layer region is equal to the ratio of the FFT size and the guard interval of each physical layer region. Accordingly, the guard intervals of the physical layer regions have the same length.

Since the guard terminal of the physical layer regions have the same length, the transmitting end may set the guard interval as shown in FIG. 3.

3 illustrates a procedure for setting a guard interval in a transmitting end of a broadcast communication system according to another embodiment of the present invention.

Referring to FIG. 3, the transmitter determines whether it supports multiple physical layer area services in step 301. That is, the transmitter checks whether the broadcast communication system supports the multi-physical layer region frame configured as shown in FIG.

If the multi-physical layer area service is not supported, the transmitting end terminates the present algorithm.

On the other hand, when supporting the multi-physical layer area service, the transmitting end proceeds to step 303 to confirm the delay spread (delay spread).

In step 305, the transmitter determines the guard interval ratio of the reference physical layer region, which is a physical layer region that is a reference for setting the guard interval in consideration of the maximum delay spread. In this case, the transmitter determines the guard interval ratio such that the guard interval of the physical layer region is larger than the maximum delay spread. For example, in FIG. 1, the transmitter determines a region ₀ 110 including a P2 region 130 as a reference physical layer region. Accordingly, the transmission terminal determines the guard interval ratio of the area ₀ (110) in consideration of the FFT size and the maximum delay spread in the area ₀ (110). Here, the guard interval ratio indicates the ratio of the FFT size and the length of the guard interval. For example, the guard interval ratio includes 19/256, 19/128, 1/128, 1/32, 1/16, 1/8, and 1/4. In the following description, the ratio of the guard interval of the physical layer region to which the guard interval is set is referred to as a reference ratio.

After determining the reference ratio, the transmitter proceeds to step 307 to determine the length of the guard interval using the FFT size and the guard interval ratio of the reference physical layer region.

After determining the length of the guard interval, the transmitter proceeds to step 309 and adds the guard interval of the length determined in step 307 to the symbol included in each physical layer region. That is, the transmitting end adds a guard interval of the same length to each physical layer region. Accordingly, the transmitter adds a guard interval having a length determined by the FFT size and the guard interval ratio of the reference physical layer region to each symbol included in the physical layer regions in step 307.

In step 311, the transmitting end transmits a frame including a plurality of physical layer regions. In this case, when the reference physical layer region includes the P2 region, the preamble (P1 symbol) of the frame includes FFT size and guard interval ratio information of the reference physical layer region. For another example, when the reference physical layer region does not include a P2 region, the preamble (P1 symbol) of the frame may store FFT size and guard interval ratio information of a physical layer region including the reference physical layer region and the P2 region. It must be included.

Hereinafter, a method of operating a receiver for receiving a broadcast signal transmitted by the transmitter as shown in FIG. 2 or 3 will be described.

5 illustrates a procedure for detecting a signal at a receiving end of a broadcasting communication system according to an embodiment of the present invention.

Referring to FIG. 5, the receiving end checks whether a broadcast signal transmitted by the transmitting end is received in step 501.

If no broadcast signal is received, the receiving end terminates the present algorithm.

On the other hand, when the broadcast signal is received, the receiver proceeds to step 503 to check the FFT size and the reference ratio of the reference physical layer region in the P1 symbol included in the broadcast signal. For example, when region ₀ 110 illustrated in FIG. 1 is a reference physical layer region, the receiving end may have an FFT size and a reference ratio of region ₀ 110 including P2 region 130 in a P1 symbol. Check. In addition, the receiving end obtains frame synchronization from the P1 symbol. For another example, when the physical layer region including the P2 region 130 is different from the reference physical layer region, the receiving end may perform FFT of the physical layer region including the P2 region 130 and the reference physical layer region in the P1 symbol. You can also check the size and the baseline ratio. Here, the reference ratio represents the guard interval ratio of the reference physical layer region.

In step 505, the receiving end checks the FFT size of each physical layer region in the P2 region included in the broadcast signal.

After checking the FFT sizes of the physical layer regions, the receiving end proceeds to step 507 in which the guard interval of each physical layer region is determined using the FFT size and reference ratio of the reference physical layer region and the FFT size of the physical layer regions. Determine the ratio. For example, the receiving end determines the guard interval ratio of each physical layer region such that the product of the FFT size and the guard interval ratio of the reference physical layer region is equal to the ratio of the FFT size and the guard interval of each physical layer region. In FIG. 4, when the FFT size is 2K and the region 0400 having the guard interval ratio 1/4 (402) is the reference physical layer region, the guard interval ratio of the region 1 410 having the 4FT FFT size is 4K. Is determined as 1/8 (412), and the guard interval ratio of region 2 420 having an FFT size of 8K is determined as 1/16 (422).

After determining the guard interval ratio of the physical layer regions, the receiver proceeds to step 509 and checks the guard interval length of each physical layer region using the guard interval ratio of the physical layer regions.

In operation 511, the receiving end detects a signal of each physical layer region in consideration of the guard interval length of each physical layer region. For example, the receiving end removes a guard interval from a symbol of each physical layer region in consideration of the guard interval length of each physical layer region. Thereafter, the receiving end decodes each symbol from which the guard stations are removed to restore broadcast data.

As described above, the receiving end determines the guard interval ratio of each physical layer region such that the product of the FFT size of the reference physical layer region and the guard interval ratio is equal to the ratio of the FFT size and the guard interval of each physical layer region. Accordingly, the guard intervals of the physical layer regions have the same length.

The receiving end may set the guard interval as shown in FIG. 6 since the guard intervals of the physical layer regions have the same length.

6 illustrates a procedure for detecting a signal at a receiving end of a broadcasting communication system according to another embodiment of the present invention.

Referring to FIG. 6, the receiver checks whether a broadcast signal transmitted by the transmitter is received in step 601.

If no broadcast signal is received, the receiving end terminates the present algorithm.

On the other hand, when the broadcast signal is received, the receiver proceeds to step 603 to check the FFT size and the reference ratio of the reference physical layer region in the P1 symbol included in the broadcast signal. For example, when region ₀ 110 illustrated in FIG. 1 is a reference physical layer region, the receiving end may have an FFT size and a reference ratio of region ₀ 110 including P2 region 130 in a P1 symbol. Check. In addition, the receiving end obtains frame synchronization from the P1 symbol. For another example, when the physical layer region including the P2 region 130 is different from the reference physical layer region, the receiving end may perform FFT of the physical layer region including the P2 region 130 and the reference physical layer region in the P1 symbol. You can also check the size and the baseline ratio. Here, the reference ratio represents the guard interval ratio of the reference physical layer region.

After confirming the FFT size and the reference ratio of the reference physical layer region, the receiving end checks the guard interval length using the FFT size and the reference ratio of the reference physical layer region in step 605.

In step 607, the receiving end detects a signal of each physical layer area in consideration of the guard interval length. That is, the guard interval lengths of the physical layer regions are the same. Accordingly, the receiving end detects a signal of each physical layer region by using the guard interval length determined using the FFT size and the guard interval ratio of the reference physical layer region in step 605. For example, the receiving end removes a guard interval from a symbol of each physical layer region in consideration of the guard interval length. Thereafter, the receiving end decodes each symbol from which the guard stations are removed to restore broadcast data.

Hereinafter, a description will be given of the configuration of the transmitting end for setting the guard interval in each physical layer region.

7 is a block diagram of a transmitter in a broadcast communication system according to the present invention.

As shown in FIG. 7, the transmitting end includes a scheduler 710, a service splitter 720, a plurality of region generators 730-1 to 730 -N, and a multiplexer (MUX). 740, a preamble inserter 750, and a RF (Radio Freqeuncy) transmitter 760.

The scheduler 710 schedules broadcast services. That is, the scheduler 710 determines through which area each broadcast service is provided. In addition, the scheduler 710 allocates resources according to the region information providing the determined broadcast service.

The service classifier 720 provides data of each broadcast service to a corresponding region generator according to the determination of the scheduler 710. For example, even if the frame is configured as shown in Figure 1, the service classifier 720 provides the signaling data to the area ₀ generator (730-1) that is responsible for the area ₀ (110). Here, the signaling data includes physical area information 131 and a data map 132. For another example, when the P2 region 130 and the region ₀ 110 are separated from each other, the transmitting end may include a P2 region generator (not shown) in addition to the N region generators 730-1 to 730 -N. It may be configured to include more. In this case, the service classifier 720 provides signaling data including physical area information and a data map to the P2 area generator.

The service classifier 720 includes a guard interval determiner 722.

The guard interval determiner 722 determines the guard interval length of the physical layer regions. For example, the guard interval determiner 722 determines the guard interval length of the physical layer regions as shown in FIG. 2. In this case, the guard interval determiner 722 includes a reference physical layer region setter, a guard interval ratio determiner, and a guard interval setter. The reference physical layer region setter determines a guard interval ratio of the reference physical layer region, which is a physical layer region which is a reference for setting the guard interval in consideration of the maximum delay spread. The guard interval ratio determiner determines the guard interval ratio of each physical layer region by using the FFT size and the guard interval ratio of the reference physical layer region. The guard interval setter determines the guard interval length of each physical layer region using the guard interval ratio of the physical layer regions.

For another example, the guard interval determiner 722 may determine guard interval lengths of physical layer regions as shown in FIG. 3. In this case, the guard interval determiner 722 includes a reference physical layer region setter and a guard interval setter. The reference physical layer region setter determines the guard interval ratio of the physical layer region as a reference for setting the guard interval in consideration of the maximum delay spread. The guard interval setter determines the length of the guard interval using the FFT size and the guard interval ratio of the reference physical layer region. In this case, the guard interval determiner 722 applies the determined guard interval to the physical layer regions.

The region generators 730-1 to 730 -N configure a broadcast signal to be transmitted through each region. In this case, the region generators 730-1 to 730 -N apply different system parameters, but have the same detailed block configuration. Accordingly, the region 0 generator 730-1 of the region generators 730-1 to 730 -N will be described as a representative.

The region 0 generator 730-1 includes an input processor 731, an encoding and modulator 732, a frame builder 733, an OFDM modulator 734, and a guard interval inserter 735. It is configured to include).

The input processor 731 divides data provided from the service classifier 720 according to a transmission standard, and inserts a packet header to generate transmission packets.

The encoder and modulator 732 generates data symbols by performing channel encoding and modulation on the packets. In this case, the encoding and modulator 732 performs encoding and modulation according to system parameters of the corresponding region. Here, the system parameter includes a coding scheme, a coding rate, a modulation scheme, and the like.

The frame configurator 733 arranges the data symbols according to a frame structure. That is, the frame configurator 733 maps the data symbols to subcarriers and time resources.

The OFDM modulator 734 performs an Inverse Fast Fourier Transform (IFFT) operation on data symbols provided from the frame configurator 733.

The guard interval inserter 735 inserts a guard interval having a length determined by the guard interval determiner 722 for region 0 into each symbol.

The multiplexer 740 multiplexes the signals of each physical layer region provided from the plurality of region generators 730-1 through 730 -N. Here, the signals of each physical layer region may be multiplexed by time division or frequency division.

The preamble inserter 750 inserts a preamble signal (P1 symbol) in front of the frame provided from the multiplexer 740. For example, when the physical layer region including the P2 region is a reference physical layer region, the P1 symbol includes FFT size and guard interval ratio information of the reference physical layer region. For another example, when the reference physical layer region does not include the P2 region, the P1 symbol may include FFT size and guard interval ratio information of the physical layer region including the reference physical layer region and the P2 region.

The RF transmitter 760 up-converts the signal of the frame into a signal of an RF band and transmits the signal through an antenna. For example, the RF transmitter 760 includes an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), and the like.

In the above-described embodiment, the guard interval determiner 722 is included in the service classifier 720. However, the guard interval determiner 722 may be configured separately from the service classifier 720.

In the above-described embodiment, the transmitting end includes region generators 730-1 through 730 -N for each physical layer region.

According to another embodiment of the present disclosure, the transmitting end may include only one region generator. In this case, the one region generator generates a signal by applying different system parameters according to the region for transmitting broadcast service data. That is, the transmitting end may continuously generate broadcast signals for each region using only one region generator.

Hereinafter, a description will be given of the configuration of a receiving end for receiving a broadcast signal.

8 is a block diagram of a receiving end in a broadcast communication system according to the present invention.

As shown in FIG. 8, the receiving end includes an RF receiver 810, a preamble detector 820, a de-multiplexer (DEMUX) 830, and a plurality of region analyzers 840-1 to 840-. N) and the guard interval checker 850 is configured.

The RF receiver 810 down converts an RF band signal received through an antenna into a baseband signal. For example, the RF receiver 810 includes an amplifier, a mixer, an oscillator, an analog to digital convertor (ADC), and the like.

The preamble detector 820 detects a preamble signal (P1 symbol) to obtain frame synchronization. In addition, the preamble detector 820 checks the ratio of the FFT size and the guard interval for the P2 region in the preamble signal (P1 symbol). For example, when the P2 region is included in the reference physical layer region, the preamble detector 820 checks the FFT size and the reference ratio of the reference physical layer region in the P1 symbol. For another example, when the physical layer region including the P2 region is different from the reference physical layer region, the preamble detector 820 may determine the FFT size and reference of the physical layer region including the P2 region and the reference physical layer region in the P1 symbol. You can also check the ratio. Here, the reference ratio represents the guard interval ratio of the reference physical layer region.

The demultiplexer 830 divides a frame into a plurality of regions, and provides a signal of each divided region to corresponding region analyzers 840-1 to 840 -N.

The guard interval checker 850 checks the guard interval length for each physical layer region. For example, the guard interval checker 850 checks the guard interval length for each physical layer region as shown in FIG. 5. In this case, the guard interval checker 850 includes a physical layer information checker, a guard interval ratio checker, and a guard interval length checker. The physical layer information checker checks the FFT size of each physical layer region in the P2 region included in the broadcast signal. The guard interval ratio checker uses the FFT size and reference ratio of the reference physical layer region provided from the preamble detector 820 and the FFT size of each physical layer region identified by the reference physical layer region checker. Determine the guard interval ratio of the hierarchical region. The guard interval length checker confirms the guard interval length of each physical layer region using the guard interval ratio of the physical layer regions identified by the guard interval ratio checker. For another example, the guard interval checker 850 recognizes that guard interval lengths of the physical layer regions are the same. Accordingly, the guard interval checker 850 checks the guard interval length for the physical layer region as shown in FIG. 6. In this case, the guard interval checker 850 checks the guard interval length using the FFT size and the reference ratio of the reference physical layer region provided from the preamble detector 820.

The region analyzers 840-1 through 840 -N interpret signals corresponding to respective regions. Here, the region analyzers 840-1 to 840 -N have different system parameters but have the same detailed block configuration. Accordingly, the region 0 analyzer 840-1 of the region analyzers 840-1 to 840 -N will be described as a representative.

The region 0 interpreter 840-1 includes a guard interval remover 841, an OFDM demodulator 842, a service selector 843, a demodulator and decoder 844, and an output processor 845.

The guard interval remover 841 removes the guard interval from each symbol located in the region 0 according to the guard interval length information provided from the guard interval checker 850.

The OFDM demodulator 842 reconstructs the symbols mapped to the frequency domain through a fast fourier transform (FFT) operation on the symbols of which the guard interval is removed by the guard interval remover 841.

The service selector 843 extracts a data symbol of a broadcast service from a symbol provided from the OFDM demodulator 842. In this case, allocation information on the signal of the broadcast service is confirmed through signaling data included in the region ₀ .

The demodulator and decoder 844 compensates for the distortion of the data symbol provided from the service selector 843, and demodulates and decodes the data symbol to restore packets including broadcast data.

The output processor 845 restores the broadcast data included in the packets provided from the demodulator and decoder 844 into a form that can be processed in a higher layer.

Although not shown, the receiving end may further include a P2 area interpreter that interprets the physical area information and the data map included in the P2 area. In the above-described embodiment, the receiving end may include an area for each physical layer area. And interpreters 840-1 through 840 -N.

In another embodiment, the receiving end may include only one region analyzer. In this case, the one region analyzer analyzes signals by applying different system parameters according to regions corresponding to signals provided from the demultiplexer 830. That is, the receiving end interprets the region signals continuously received using only one region analyzer according to system parameters related to each physical layer region.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (30)

A method for transmitting a signal in a transmitting end of a broadcasting communication system for transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region,
Determining a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region;
And determining a guard interval length of the second physical layer region by using an FFT size and a guard interval ratio of the first physical layer region.
The method of claim 1,
The determining of the guard interval length of the second physical layer region may include:
Determining an FFT size of the second physical layer region;
Determining a guard interval ratio of the second physical layer region by using an FFT size of the second physical layer region, an FFT size of the first physical layer region, and a guard interval ratio;
And determining a guard interval length of the second physical layer region by using a guard interval ratio of the second physical layer region.
The method of claim 2,
The determining of the guard interval ratio of the second physical layer region may include:
Determining a guard interval ratio of the second physical layer region such that the product of the FFT size and the guard interval ratio of the first physical layer region is the same as the product of the FFT size and the guard interval ratio of the second physical layer region. Characterized in that the method.
The method of claim 1,
Determining the guard interval length of the first physical layer region by using the guard interval ratio of the first physical layer region after determining the FFT size and the guard interval ratio of the first physical layer region. How to.
The method of claim 4, wherein
After checking the guard interval length of the first physical layer region, a guard interval having a guard interval length of the first physical layer region and the second physical layer region may be assigned to the guard interval of the first physical layer region and the second physical layer region. The method further comprises the step of transmitting in addition to the symbol.
6. The method of claim 5,
Adding and transmitting the guard period,
Adding a guard interval to a symbol included in the first physical layer region and the second physical layer region;
Multiplexing signals for the first physical layer region and the second physical layer region;
And adding a preamble including the FFT size and the guard interval ratio of the first physical layer region to the multiplexed signal.
The method according to claim 6,
The preamble, when the physical layer region including the P2 region including the first physical layer region and the physical region information and the data map is different, the FFT size and the guard interval ratio of the first physical layer region and the P2 And a guard interval ratio of the FFT size of the physical layer region including the region.
The method of claim 1,
And the first physical layer region includes a P2 region including physical region information and a data map.
A method for receiving a signal at a receiving end of a broadcast communication system transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region,
Checking a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region;
And obtaining a guard interval length of a second physical layer region by using an FFT size and a guard interval ratio of the first physical layer region.
The method of claim 9,
Obtaining the guard interval length of the second physical layer region,
Checking an FFT size of the second physical layer region;
Determining a guard interval ratio of the second physical layer region by using an FFT size of the second physical layer region, an FFT size of the first physical layer region, and a guard interval ratio;
And obtaining a guard interval length of the second physical layer region by using a guard interval ratio of the second physical layer region.
The method of claim 9,
Checking the FFT size and the guard interval ratio,
And obtaining a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region from the preamble.
12. The method of claim 11,
The determining of the guard interval ratio of the second physical layer region may include:
Determining a guard interval ratio of the second physical layer region such that the product of the FFT size and the guard interval ratio of the first physical layer region is the same as the product of the FFT size and the guard interval ratio of the second physical layer region. Characterized in that the method.
The method of claim 9,
And after checking the FFT size and the guard interval ratio, obtaining a guard interval length of the first physical layer region using the guard interval ratio of the first physical layer region.
The method of claim 13,
After checking the guard interval lengths of the first physical layer region and the second physical layer region, the guard intervals of the first physical layer region and the second physical layer region are removed to remove the first physical layer region and the second physical layer region. Obtaining a symbol included in the physical layer region.
15. The method of claim 14,
The process of removing the guard interval,
Removing the guard interval of the first physical layer region and the second physical layer region in consideration of the length of the guard interval of the first physical layer region and the second physical layer region;
And detecting data in the symbol from which the guard interval has been removed.
The method of claim 9,
And the first physical layer region includes a P2 region including physical region information and a data map.
An apparatus for transmitting a signal in a broadcasting communication system for transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region,
A guard interval determiner configured to determine a guard interval ratio between the first physical layer region and the second physical layer region to determine a guard interval length between the first physical layer region and the second physical layer region;
And at least one physical layer region generator for adding a guard interval having a guard interval length determined by the guard interval determiner to signals of the first physical layer region and the second physical layer region.
18. The method of claim 17,
And the first physical layer region includes a P2 region including physical region information and a data map.
18. The method of claim 17,
The guard interval determiner determines an FFT size and a guard interval ratio of the first physical layer region,
Determine a guard interval length of the first physical layer region by using a guard interval ratio of the first physical layer region,
And determining a guard interval length of the second physical layer region using the FFT size and the guard interval ratio of the first physical layer region.
20. The method of claim 19,
The guard interval determiner determines the FFT size of the second physical layer region,
Determine a guard interval ratio of the second physical layer region by using an FFT size of the second physical layer region, an FFT size of the first physical layer region, and a guard interval ratio,
And a guard interval length of the second physical layer region is determined using a guard interval ratio of the second physical layer region.
The method of claim 20,
The guard interval determiner may include a guard interval ratio of the second physical layer region such that a product of an FFT size and a guard interval ratio of the first physical layer region is equal to a product of an FFT size of the second physical layer region and a ratio of a guard interval. Device for determining the.
18. The method of claim 17,
A multiplexer for multiplexing the first physical layer region signal and the second physical layer region signal generated by the at least one physical layer region generator;
And a preamble inserter for adding the preamble including the FFT size and the guard interval ratio of the first physical layer region to the multiplexed signal.
23. The method of claim 22,
The preamble inserter, when the physical layer region including the P2 region including the first physical layer region and the physical region information and the data map is different, the FFT size and the guard interval ratio of the first physical layer region, and the And adding a preamble including the FFT size and the guard interval ratio of the physical layer region including the P2 region to the multiplexed signal.
An apparatus for receiving a signal in a broadcast communication system for transmitting a frame including a plurality of physical layer regions including a first physical layer region and at least one second physical layer region,
Determine a guard interval length of the first physical layer region by checking a fast fourier transform (FFT) size and a guard interval ratio of the first physical layer region, and use the FFT size and guard interval ratio of the first physical layer region. A guard interval checker for checking a guard interval length of the second physical layer region by
And at least one physical layer region analyzer for removing the guard interval of the length checked by the guard interval checker from the first physical layer region signal and the second physical layer region signal.
25. The method of claim 24,
And the first physical layer region includes a P2 region including physical region information and a data map.
25. The method of claim 24,
The guard interval checker is configured to obtain a guard interval length of the first physical layer region using the FFT size and the guard interval ratio of the first physical layer region.
25. The method of claim 24,
The guard interval checker determines the FFT size of the second physical layer region and uses the FFT size of the second physical layer region, the FFT size of the first physical layer region, and the guard interval ratio to the second physical layer. And determining a guard interval ratio of the region and obtaining a guard interval length of the second physical layer region using the guard interval ratio of the second physical layer region.
28. The method of claim 27,
The guard interval checker may include a guard interval ratio of the second physical layer region such that the product of the FFT size of the first physical layer region and the guard interval ratio is equal to the product of the FFT size of the second physical layer region and the ratio of the guard interval. Device for determining the.
25. The method of claim 24,
A preamble detector for detecting a preamble including an FFT size and a guard interval ratio of the first physical layer region;
And a demultiplexer for demultiplexing the received signal into a first physical layer region signal and a second physical layer region signal.
30. The method of claim 29,
The preamble detector, when the physical layer region including the P2 region configured to include the first physical layer region and the physical region information and the data map is different, the FFT size and the guard interval ratio of the first physical layer region, and the And detecting the FFT size and the guard interval ratio of the physical layer region including the P2 region through the preamble, respectively.

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