KR102445238B1 - Broadcast signal transmission method to which frequency bandwidth scalability is applied using multiples of basic bandwidth and apparatus therefor - Google Patents

Abstract

Disclosed are a method for transmitting/receiving a broadcast signal to which frequency bandwidth scalability is applied using multiples of a basic bandwidth and an apparatus therefor. A broadcast signal transmission method according to an embodiment of the present invention multiplexes a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service. generating a signal; so that the first broadcast service and the second broadcast service share a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth , generating a transmission signal by modulating the multiplexed signal; and transmitting the transmission signal using the multiple band.

Description

Broadcast signal transmission method applying frequency bandwidth scalability using multiples of basic bandwidth and apparatus therefor

The present invention relates to a terrestrial TV broadcast transmission technology to which bandwidth scalability is applied. In particular, compared to a technology that uses a wider band than the existing 6, 7, or 8 MHz bandwidth, and uses the entire UHF band for broadcasting as one bandwidth. It relates to a broadcasting signal transmission/reception technology advantageous in terms of securing a frequency.

"WiB", a wideband technology that uses the entire 470MHz to 694MHz band, which is an ultra-high frequency (UHF) band allocated for terrestrial broadcasting, with one bandwidth BW=224MHz, was introduced.

For example, 5 broadcasters can transmit their own broadcast signals on different frequencies by dividing the 470MHz~694MHz band into bandwidths of 6MHz, 7MHz, or 8MHz, but WiB broadcasts 5 broadcasters in one band with BW=224MHz It is a technology that transmits all signals.

In the case of conventional broadcasting, a data rate of about 40 Mbps can be obtained in a multiple frequency network (MFN) by applying a bandwidth of 6 MHz, 7 MHz, or 8 MHz, and a data rate of about 33 Mbps can be obtained in a single frequency network (SFN).

For example, when a bandwidth of 8 MHz is used in conventional broadcasting, broadcasters may transmit their own broadcasting signals in different frequency bands. In this way, when the MFN is configured such that frequencies do not overlap each other between adjacent broadcast coverages by appropriately disposing different frequencies, signal interference occurring between different broadcasters can be prevented.

On the other hand, WiB uses the same frequency (eg, fo) and bandwidth of 224 MHz in all broadcasting areas. In WiB, since all broadcasting regions use the same frequency (fo), broadcast signal interference occurs between adjacent broadcasting regions. In order to overcome such broadcast signal interference, WiB applies a noise-resistant modulation signal such as QPSK modulation and channel code rate CR=1/2. Even if such a low QAM order is applied, since a broadband of 224 MHz is used, WiB can obtain the same data rate as the existing technology in the overall UHF 470 to 694 MHz band for broadcasting.

Example of obtaining a transmission rate of 200Mbps (=5 X 40Mbps) by applying 256QAM and CR=2/3 to a bandwidth of 8MHz based on the DVB-T2 system when 5 broadcasters divide the 470~694MHz frequency in the UHF band for broadcasting (5 transmitters) and WiB applied and QPSK, CR=1/2 applied to 224 MHz bandwidth to obtain a transmission rate of about 200 Mbps (1 transmitter), the case where WiB is applied is about 50 times (17 dB) ) lower transmit power is required. In this case, the case of transmitting the broadcast signal based on WiB uses about 10% of transmission power compared to the case of transmitting the broadcast signal based on DVB-T2, and thus, there is an effect of reducing the transmission power of 90%. In this case, the WiB requires a relatively lower transmit power because the interval between signal constellations is large, so that it is possible to apply a lower transmit power than in the case of DVB-T2.

In this way, since WiB uses the entire UHF broadcasting frequency band as one bandwidth, frequency arrangement is very simple. In the case of transmitting a broadcast signal using the existing 8 MHz bandwidth with the center frequency f1, if there are six broadcasting regions in the vicinity, in order to provide different contents for each broadcasting region, all six neighboring broadcasting regions use different center frequencies ( f2, ..., f7) are used to prevent mutual interference. Therefore, when the existing bandwidth of 6 MHz, 7 MHz, or 8 MHz is applied, frequency channel arrangement is required.

On the other hand, in the case of WiB, all broadcasting areas use the same center frequency fo as the bandwidth of 224 MHz. Therefore, in case of applying WiB, since all broadcasting areas have the same bandwidth of 224 MHz and the same center frequency fo, there is no need for a separate frequency arrangement.

In addition, WiB can reduce broadcasting network installation costs. For example, if 5 broadcasters use the existing bandwidth of 6MHz, 7MHz, or 8MHz in the UHF 470-694MHz band for broadcasting, 5 separate transmitters must be installed for each of the 5 broadcasters. However, when 224 MHz is used as one bandwidth, five broadcasters can share one transmitter, so that the cost of installing a broadcast network is greatly reduced.

Furthermore, WiB can reduce broadcasting network operating costs. When using the existing bandwidth of 6MHz, 7MHz or 8MHz, 256QAM modulation and channel code rate CR=2/3 must be applied to obtain a data rate of about 40Mbps per broadcaster, so high transmission power is required. If one broadcaster provides a transmission rate of 40Mbps, five broadcasters will provide a transmission rate of 200Mbps in the entire broadcasting frequency band. When WiB is applied, a 224 MHz bandwidth is used, so if 1 bit is transmitted per 1 Hz, a data rate of about 224 Mbps can be obtained. Therefore, if the channel code rate CR=1/2 is applied to QPSK modulation, transmission of 1 bit per 1 Hz is possible. In this case, since WiB can transmit broadcast signals with only about 10% of transmit power compared to the case of using 256QAM and CR=2/3 with a bandwidth of 8 MHz, a 90% transmit power saving effect can be obtained.

However, in WiB, when a plurality of broadcast networks provide a plurality of broadcast services, signal interference between broadcast networks is a problem. In a region where signals transmitted from different transmitters overlap due to such signal interference, the broadcast signal acts as noise in the same frequency band, and thus broadcast reception performance may deteriorate. Accordingly, interference cancellation between adjacent broadcasting networks is an important issue in WiB-based broadcasting.

In general, when three transmitter signals are overlapped between adjacent broadcast regions, when there is no additive white Gaussian noise (AWGN) and fading channel estimation error, the WiB signal spectrum appears by overlapping three signals transmitted from each transmitter. At this time, when any one of the signals Tx1 , Tx2 , and Tx3 transmitted by the three transmitters is received, signals received from the other two transmitters act as noise in the same frequency band. Therefore, in this case, when receiving a signal from a specific transmitter, normal reception must be performed by compensating for a channel through normal channel estimation and compensating for errors remaining in the channel code in an environment in which twice as much noise is present.

In order to solve the problem of signal interference between adjacent broadcasting areas, WiB installs a rooftop antenna with high directivity at a height of about 10m, and uses the difference in the direction in which signals are transmitted by each transmitter to receive only the desired signal. and remove unwanted signals. This technique using a directional antenna may be effective when applying a directional antenna such as a Yagi antenna in fixed reception.

However, when mobile reception is required, it is difficult to use a Yagi antenna, and since a transmission direction of a transmission signal continuously changes, it is difficult to apply a technique using a directional antenna.

Accordingly, there is an urgent need for a new broadcast signal transmission technology capable of effectively removing interference between broadcast signals between adjacent broadcast areas even when mobile reception is required while taking advantage of broadband.

SUMMARY OF THE INVENTION It is an object of the present invention to effectively eliminate broadcast signal interference between adjacent broadcast areas even when mobile reception is required while taking advantage of broadband advantages such as reduction in broadcast network installation cost, operation cost reduction, and broadcast frequency distribution simplification.

Another object of the present invention is to provide a broadcast signal transmission technology that is more efficiently applied in the case of switching from an existing broadcast system to a next-generation broadcast system based on a broadband bandwidth.

Another object of the present invention is to increase frequency utilization efficiency by reducing unnecessary guard bands.

A broadcast signal transmission method according to the present invention for achieving the above object provides a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service. generating a multiplexed signal by multiplexing; so that the first broadcast service and the second broadcast service share a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth , generating a transmission signal by modulating the multiplexed signal; and transmitting the transmission signal using the multiple band.

In this case, the broadcast signal transmission method may further include signaling at least one of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and information on the frequency band used by each of the broadcasters. .

In this case, the guard band may be excluded from at least one side of the basic bandwidth, and the guard band may be used for both sides of the multiple bandwidth.

In this case, the multiple modulation order corresponding to the multiple bandwidth may be lower than the basic modulation order corresponding to the basic bandwidth.

In this case, the first broadcast service and the second broadcast service may have the same transmission output and the same broadcast transmission site.

In this case, the first broadcast service and the second broadcast service may share one transmitter.

In addition, a method for receiving a broadcast signal according to an embodiment of the present invention includes: receiving a broadcast signal; extracting a multiple band signal received through a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth from the broadcast signal; demodulating the multiple-band signal to generate a demodulated signal; and demultiplexing the demodulated signal into a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service.

In this case, the method for receiving a broadcast signal includes: extracting an additional multiple band signal corresponding to the multiple bandwidth and corresponding to a multiple band different from the multiple band from the broadcast signal; and extracting a third broadcast service signal corresponding to a third broadcast service different from the first broadcast service and the second broadcast service from the additional multiple band signal.

In addition, the broadcast signal transmission apparatus according to an embodiment of the present invention transmits a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service. a multiplexing unit generating a multiplexed signal by multiplexing; so that the first broadcast service and the second broadcast service share a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth , a modulator for generating a transmission signal by modulating the multiplexed signal; and an antenna for transmitting the transmission signal using the multiple band.

In this case, the broadcast signal transmission apparatus further includes a signaling information generator configured to signal at least one of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and frequency band information used by each of the broadcasters. can do.

In this case, the guard band may be excluded from at least one side of the basic bandwidth, and the guard band may be used for both sides of the multiple bandwidth.

In this case, the multiple modulation order corresponding to the multiple bandwidth may be lower than the basic modulation order corresponding to the basic bandwidth.

In this case, the first broadcast service and the second broadcast service may have the same transmission output and the same broadcast transmission site.

In this case, the first broadcast service and the second broadcast service may share one transmitter.

In addition, an apparatus for receiving a broadcast signal according to an embodiment of the present invention includes: an antenna for receiving a broadcast signal; Demodulates a multiple band signal extracted from the broadcast signal and received through a multiple band corresponding to a multiple of the basic bandwidth and corresponding to a multiple bandwidth smaller than the whole bandwidth a demodulator to generate a demodulated signal; and a demultiplexer for demultiplexing the demodulated signal into a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service.

According to the present invention, it is possible to effectively remove broadcast signal interference between adjacent broadcast areas even when mobile reception is required while taking advantage of broadband advantages such as reduction in broadcast network installation cost, operation cost reduction, and broadcast frequency distribution simplification.

In addition, the present invention can provide a broadcast signal transmission technology that is more efficiently applied in the case of switching from an existing broadcast system to a next-generation broadcast system based on a broadband bandwidth.

In addition, the present invention can increase frequency use efficiency by reducing unnecessary guard bands.

1 and 2 are diagrams illustrating the concept of a broadcast signal transmission method according to an embodiment of the present invention.
3 is a diagram illustrating an example in which four broadcasters transmit broadcast signals using four 8 MHz band transmitters.
4 is a diagram illustrating an example of a broadcast signal transmission apparatus according to an embodiment of the present invention.
5 is a diagram illustrating another example of a broadcast signal transmission apparatus according to an embodiment of the present invention.
6 is a diagram illustrating an example of an apparatus for receiving a broadcast signal according to an embodiment of the present invention.
7 is a diagram illustrating a frequency arrangement of multiple bandwidths according to an embodiment of the present invention.
8 and 9 are diagrams illustrating frequency use efficiency of a broadcast signal transmission method according to an embodiment of the present invention.
10 is a flowchart illustrating a broadcast signal transmission method according to an embodiment of the present invention.
11 is an operation flowchart illustrating a method for receiving a broadcast signal according to an embodiment of the present invention.
12 is a diagram illustrating an example in which a broadcast signal transmission method according to an embodiment of the present invention is applied to Seoul, Korea.
13 is a diagram illustrating an example in which a broadcast signal transmission method according to an embodiment of the present invention is applied to national broadcasting in Korea.

The present invention will be described in detail with reference to the accompanying drawings as follows. Here, repeated descriptions, well-known functions that may unnecessarily obscure the gist of the present invention, and detailed descriptions of configurations will be omitted. The embodiments of the present invention are provided in order to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer description.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a bandwidth scalability using a multiple bandwidth smaller than 224 MHz, which is a whole bandwidth, using a bandwidth of 6 MHz, 7 MHz or 8 MHz currently used for each country as a basic bandwidth (bandwidth scalability) technology that provides

For example, if there are 4 broadcasters that conduct national broadcasts in a country using 6MHz of bandwidth in terrestrial broadcasting, and their broadcasting area (transmission signal output) and transmission site are the same, 4 broadcasters are A 24MHz (=4 X 6MHz) bandwidth is available. In this case, since four broadcasters can share one broadcast transmitter, the broadcast network installation cost is reduced by 1/4. However, it may be difficult to apply a broadband bandwidth by combining bandwidths when broadcasting areas are different between broadcasters or when transmission sites are different.

The present invention is a technology that can solve the problem of signal interference between adjacent broadcasting networks while taking advantage of the WiB technology. Furthermore, according to the present invention, it is easy to secure a frequency for a next-generation broadcasting system by using multiple bandwidths of the currently used 6MHz, 7MHz, or 8MHz band when the existing broadcasting system is converted to a broadband bandwidth-based next-generation broadcasting system.

1 and 2 are diagrams illustrating the concept of a broadcast signal transmission method according to an embodiment of the present invention.

Referring to Figure 1, unlike the case of using the UHF channel 224MHz for broadcasting as one bandwidth (whole bandwidth), using a multiple bandwidth of 32MHz (= 8MHz X 4) in a country using a basic bandwidth of 8MHz (multiple bandwidth) In this case, it can be seen that, since adjacent broadcast zones can use different frequencies, interference between broadcast signals of adjacent broadcast zones can be avoided.

Referring to FIG. 2 , it can be seen that four of the basic bandwidths of 8 MHz are gathered to become one multiple bandwidth.

1 and 2 , a multiple bandwidth corresponding to 4 times is taken as an example, but this is only exemplary and the technical spirit of the present invention is not limited to a 4 times multiple bandwidth.

3 is a diagram illustrating an example in which four broadcasters transmit broadcast signals using four 8 MHz band transmitters.

Referring to Figure 3, four broadcasters (311, 313, 315, 317) four transmitters (321, 323, 325, 327) of a basic bandwidth of 8 MHz and four transmit antennas (331, 333, 335, 337) to transmit a broadcast signal.

In the example shown in FIG. 3 , all four broadcasters use a basic bandwidth of 8 MHz, but since interference can be avoided when frequencies and bands used are different from each other, each broadcaster must have a transmitter.

4 is a diagram illustrating an example of a broadcast signal transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 4 , an apparatus for transmitting broadcast signals according to an embodiment of the present invention includes a transmitter 420 and an antenna 430 .

In this case, the transmitter 420 includes a multiplexer 421 and a modulator 423 .

In the example of Figure 4, when the four broadcasters (411, 413, 415, 417) share a multiple bandwidth of 32 MHz (= 8 MHz X 4), the four broadcasters (411, 413, 415, 417) are transmitter 1 A dog can be shared to transmit a broadcast signal.

The multiplexer 421 multiplexes broadcast service signals corresponding to broadcast services corresponding to the broadcasters 411 , 413 , 415 , and 417 to generate a multiplexed signal.

The modulator 423 is a broadcast service corresponding to the broadcasters (411, 413, 415, 417), corresponding to a multiple of the basic bandwidth (basic bandwidth) and smaller than the entire bandwidth (whole bandwidth) multiple bandwidth (multiple bandwidth) A transmission signal is generated by modulating the multiplexed signal to share a corresponding multiple band.

The antenna 430 transmits the transmission signal using the multiple band.

In this case, the broadcast signal transmission apparatus may further include a signaling information generator 419 . In this case, the signaling information generator 419 may signal any one or more of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and information on each frequency band used by the broadcasters. In this case, the frequency band information used by each of the broadcasters may be frequency band information allocated to each broadcaster within the multiple bandwidth.

In this case, a guard band may be excluded from at least one side of the basic bandwidth, and a guard band may be used for both sides of the multiple bandwidth.

In this case, the multiple modulation order corresponding to the multiple bandwidth may be lower than the basic modulation order corresponding to the basic bandwidth. Accordingly, when a multiple bandwidth is used, a low transmission power can be used, so that the transmission power is reduced.

In this case, the broadcasters 411 , 413 , 415 , and 417 may have the same transmission output and the same broadcast transmission site. In this case, the broadcasters 411 , 413 , 415 , and 417 may share one transmitter.

5 is a diagram illustrating another example of a broadcast signal transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 5 , an apparatus for transmitting broadcast signals according to an embodiment of the present invention includes a transmitter 520 and an antenna 530 .

In this case, the transmitter 520 includes a multiplexer 521 and a modulator 523 .

In the example of FIG. 5 , when two broadcasters 511 and 513 share a multiple bandwidth of 32 MHz, the two broadcasters 511 and 513 may share one transmitter to transmit a broadcast signal.

In this case, the broadcast signal transmission apparatus may further include a signaling information generator 519 . In this case, the signaling information generator 519 may signal any one or more of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and information on each frequency band used by the broadcasters.

As in the example shown in FIG. 5 , when two broadcasters use a bandwidth of 32 MHz, a frequency band of 16 MHz may be allocated to each of the two broadcasters. At this time, if 256QAM modulation is used when the bandwidth is 8 MHz, 16QAM modulation can be used when the bandwidth is 16 MHz for the same data rate. In this way, if the multiple band frequency is used, broadcasters can share a transmitter, and a low-order robust modulation can be applied, thereby reducing transmission power.

6 is a diagram illustrating an example of an apparatus for receiving a broadcast signal according to an embodiment of the present invention.

Referring to FIG. 6 , an apparatus for receiving broadcast signals according to an embodiment of the present invention includes an antenna 630 and a receiver 620 . In this case, the receiver 620 includes a demodulator 621 and a demultiplexer 623 .

The antenna 630 receives a broadcast signal.

Although not explicitly shown in FIG. 6 , the receiver 620 may include a band extractor that extracts only a signal of a specific band (eg, a multiple band) from the broadcast signal.

The demodulator 621 demodulates the multiple-band signal extracted from the broadcast signal to generate a demodulated signal. In this case, the multiple band signal may be received through multiple bandwidth. At this time, the multiple bandwidth (multiple bandwidth) may correspond to a multiple of the basic bandwidth (basic bandwidth) and may be smaller than the whole bandwidth (whole bandwidth).

The demultiplexer 623 demultiplexes the demodulated signal into broadcast signals corresponding to the broadcasters 611 , 613 , 615 and 617 .

At this time, the demodulator 621 or the demultiplexer 623 is configured to include information on multiples corresponding to the multiple bands signaled from the transmitter, information on the number of broadcasters sharing the multiple bands, and frequency band information used by each of the broadcasters. Any one or more may be used to operate.

At this time, the receiver 620 extracts an additional multiple band signal corresponding to the multiple bandwidth from the broadcast signal and corresponding to a multiple band different from the multiple band, and from the additional multiple band signal, the broadcasters 611, 613, 615 and 617) and other broadcast service signals corresponding to different broadcasters may be extracted.

7 is a diagram illustrating a frequency arrangement of multiple bandwidths according to an embodiment of the present invention.

Referring to FIG. 7 , when a multiple bandwidth of 32 MHz is applied, it can be seen that different frequencies are allocated to adjacent broadcast areas in order to prevent interference between adjacent broadcast areas.

When 7 adjacent broadcasting regions exist around a specific broadcasting region, 7 different frequency bands (multiple bands) must exist within the 224 MHz band of 470 MHz to 694 MHz for broadcasting. Therefore, 32 MHz (= 224 MHz/7) becomes a multiple band, and a 32 MHz MFN broadcasting network can be configured.

Taking a DVB-T2 system with a bandwidth of 8MHz, 256QAM and a channel code rate of CR=2/3 as an example, the spectral efficiency is 5.31 bits/Hz, so the data rate is about 42.5 (=5.31 X 8) Mbps. . If the bandwidth is extended to 32MHz, even if QPSK and channel code rate CR=2/3 are applied, the frequency efficiency becomes 1.33 bits/Hz, so a data rate of about 42.5Mbps (=1.33 X 32) can be obtained.

Based on the DVB-T2 system, QPSK and channel code rate CR=2/3 have a quasi error free (QEF) carrier to noise ratio (CNR) of about 4.9 dB in a Rayleigh channel. With 256QAM and a channel code rate of CR=2/3, the QEF CNR is about 20.1dB in the Rayleigh channel. Therefore, when the data rates are the same, when QPSK modulation is applied, a QEF CNR gain of about 15.2 dB can be obtained compared to when 256QAM is applied. In this case, compared to the case of bandwidth 8MHz, 256QAM, and CR=2/3, only about 6% of transmit power is required for the same data rate, and 94% of power can be saved.

If 16QAM and a channel code rate CR=2/3 are applied, the QEF CNR in the Rayleigh channel is about 10.8 dB. Accordingly, when the 16QAM signal is applied, a QEF CNR gain of about 9.3 dB can be obtained compared to when the 256QAM signal is applied. In this case, compared to the case of bandwidth 8MHz, 256QAM, and CR=2/3, only about 23% of transmit power is required for the same transmission rate, and 77% of power can be saved. When 16QAM is applied, the QEF CNR gain is reduced by about 1/2 compared to the case where QPSK is applied, but a data rate twice as high can be obtained.

When multiple bandwidths according to an embodiment of the present invention are applied, there are advantages as follows.

- Reduction of transmission power

When one broadcaster applies a 32MHz bandwidth instead of an 8MHz bandwidth to obtain a data rate of about 42.5Mbps, QPSK can be applied instead of 256QAM, so that transmission power can be greatly reduced. As already described, in the case of the same channel code rate, QPSK modulation obtains a QEF CNR gain of 15.2 dB compared to 256QAM, so that a very large transmission power saving effect can be obtained for the same broadcasting area.

- Reduction of broadcasting network construction cost and operation cost reduction

If two broadcasters want to obtain a data rate of about 83Mbps (=2 X 42.5Mbps) using a 32MHz bandwidth, 16QAM modulation can be applied instead of QPSK modulation. In this case, since two broadcasters share one transmitter, the broadcast network installation cost is reduced by half. In addition, when using the 32 MHz bandwidth and 16QAM signal, there is a QEF CNR gain of about 9.3 dB compared to the case using the 8 MHz bandwidth and 256QAM, so that the same broadcasting area can be covered with a lower transmission power, thereby reducing the broadcasting network operation cost.

- Provides flexibility when switching broadcasting systems

It is more advantageous to secure a frequency when switching a broadcasting system when using a multiple bandwidth than when using a bandwidth of 224 MHz. In the case of using the bandwidth of 224 MHz, since the existing broadcasting network and the frequency band overlap, it is difficult to avoid interference between the existing 6 MHz, 7 MHz, or 8 MHz broadcasting network and the broadcasting network using the 224 MHz broadband bandwidth. However, in the case of using a multiple bandwidth, a frequency of a band that does not overlap with a bandwidth used in a 6 MHz, 7 MHz, or 8 MHz broadcasting network, which is a basic frequency band, can be used, which is advantageous compared to WiB when switching a broadcasting system.

- Improved frequency utilization efficiency

In the OFDM transmission system, in order to avoid interference with adjacent broadcast bands, guard bands that are left blank without sending data are set at both ends of the frequency spectrum. As the number of guard bands increases, the frequency band in which data is not transmitted increases, so the frequency utilization efficiency decreases. In a system using the existing 6MHz, 7MHz, or 8MHz bandwidth, a guard band applied to OFDM modulation is set for each bandwidth. On the other hand, in a broadcasting system using a broadband bandwidth, the guardband setting can be minimized, so that the frequency utilization rate is increased.

8 and 9 are diagrams illustrating frequency use efficiency of a broadcast signal transmission method according to an embodiment of the present invention.

Referring to FIGS. 8 and 9 , it can be seen that when the 8 MHz basic bandwidth is used, 4 times more guard bands are used than when the 32 MHz multiple bandwidth is used.

Accordingly, the frequency use efficiency is higher in the case of FIG. 9 than in the case of FIG. 8 .

10 is a flowchart illustrating a broadcast signal transmission method according to an embodiment of the present invention.

Referring to FIG. 10 , in a method for transmitting a broadcast signal according to an embodiment of the present invention, a first broadcast service signal corresponding to a first broadcast service and a second broadcast corresponding to a second broadcast service different from the first broadcast service A multiplexed signal is generated by multiplexing the service signal (S1010).

In addition, in the broadcast signal transmission method according to an embodiment of the present invention, the first broadcast service and the second broadcast service correspond to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth ( A transmission signal is generated by modulating the multiplexed signal to share a multiple band corresponding to multiple bandwidth (S1020).

Also, in the broadcast signal transmission method according to an embodiment of the present invention, the transmission signal is transmitted using the multiple band (S1030).

In this case, in the method for transmitting broadcast signals according to an embodiment of the present invention, at least one of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and frequency band information used by each of the broadcasters It may further include signaling.

In this case, a guard band may be excluded from at least one side of the basic bandwidth, and a guard band may be used for both sides of the multiple bandwidth.

In this case, the multiple modulation order corresponding to the multiple bandwidth may be lower than the basic modulation order corresponding to the basic bandwidth.

In this case, the first broadcast service and the second broadcast service may have the same transmission output and the same broadcast transmission site.

In this case, the first broadcast service and the second broadcast service may share one transmitter.

11 is an operation flowchart illustrating a method for receiving a broadcast signal according to an embodiment of the present invention.

Referring to FIG. 11 , in the method for receiving a broadcast signal according to an embodiment of the present invention, a broadcast signal is received ( S1110 ).

In addition, the broadcast signal receiving method according to an embodiment of the present invention corresponds to a multiple of the basic bandwidth from the broadcast signal and a multiple bandwidth corresponding to a multiple bandwidth smaller than the whole bandwidth ( Multiple band signals received through multiple bands are extracted (S1120).

Also, in the method for receiving a broadcast signal according to an embodiment of the present invention, a demodulated signal is generated by demodulating the multiple-band signal (S1130).

In addition, the method for receiving a broadcast signal according to an embodiment of the present invention transmits the demodulated signal to a first broadcast service signal corresponding to a first broadcast service and a second broadcast service corresponding to a second broadcast service different from the first broadcast service. The signal is demultiplexed (S1140).

In this case, a method for receiving a broadcast signal according to an embodiment of the present invention includes: extracting an additional multiple band signal corresponding to the multiple bandwidth and corresponding to a multiple band different from the multiple band from the broadcast signal; and extracting a third broadcast service signal corresponding to a third broadcast service different from the first broadcast service and the second broadcast service from the additional multiple band signal.

In the method of transmitting a broadcast signal using a multiple bandwidth according to an embodiment of the present invention, it may be advantageous in terms of frequency arrangement to apply an integer multiple of 6 MHz, 7 MHz, or 8 MHz, which is a frequency bandwidth for terrestrial broadcasting currently used in each country. This is because the frequency arrangement of the existing terrestrial broadcasting consists of a bandwidth of 6 MHz, 7 MHz, or 8 MHz. If a new frequency bandwidth A (A is an arbitrary positive integer) MHz is applied, a new frequency arrangement is required in units of A MHz, which takes a lot of time and money. Therefore, it is effective to use 6 MHz, 7 MHz, or 8 MHz, which are the existing bandwidths, as a basic unit, and apply an integer multiple of the basic band. Broadcasters can share one transmitter by contiguously arranging used basic frequency bands and integrating them into one multiple band.

12 is a diagram illustrating an example in which a broadcast signal transmission method according to an embodiment of the present invention is applied to a Seoul area, Korea.

12 , it can be seen that transmitters are installed in Gwanak, Yongmoon, and Gyeyang for broadcasting in the Seoul area.

At this time, the broadcasters for broadcasting in the Seoul area may be four national broadcasters of KBS1, KBS2, EBS and MBC, and two local broadcasters of SBS and OBS.

At this time, Mt. Gwanak corresponds to the transmission power of 2.5KWatt, and the transmitters of five broadcasters KBS1, KBS2, EBS, MBC and SBS may be installed. At this time, Mt. Yongmoon corresponds to 1KWatt of transmission power, and transmitters of six broadcasters KBS1, KBS2, EBS, MBC, SBS and OBS may be installed. At this time, Gyeyang corresponds to 0.5KWatt of transmission power, and transmitters of five broadcasters KBS1, KBS2, MBC, SBS and OBS may be installed.

At this time, for the four national broadcasters, if the EBS transmission station is installed in Gyeyang and the conditions of all national broadcasters (KBS1, KBS2, EBS, MBC) are the same, the four national broadcasters (KBS1) , KBS2, EBS, MBC) have the same transmission output and the same broadcast transmission site. At this time, the national broadcasters (KBS1, KBS2, EBS, MBC) may apply a single multiple bandwidth of 24 MHz (=4 X 6 MHz) by integrating each of the basic bandwidths of 6 MHz. When one multiple bandwidth is shared, four national broadcasters (KBS1, KBS2, EBS, MBC) can share one transmitter, so that the broadcasting network installation cost and operating cost can be reduced by 1/4.

The two regional broadcasters (SBS, OBS) have different broadcasting areas. That is, SBS uses Seoul as its broadcasting area, and OBS uses Incheon and Gyeonggi as its broadcasting area. Furthermore, since the broadcast transmitter sites and transmission outputs of local broadcasters (SBS, OBS) are also different from each other, it is difficult to apply one bandwidth of 12 MHz (=2 X 6 MHz), and it may be advantageous to apply the basic bandwidth of 6 MHz as it is.

13 is a diagram illustrating an example in which a broadcast signal transmission method according to an embodiment of the present invention is applied to national broadcasting in Korea.

Referring to FIG. 13 , it can be seen that the entire Republic of Korea is divided into four multiple bands F1, F2, F3, and F4 by applying the broadcast signal transmission method using a multiple bandwidth according to an embodiment of the present invention.

At this time, four national broadcasters (KBS1, KBS2, EBS, MBC) can use one 24 MHz multiple bandwidth. In this case, multiple bands of different frequencies (F1, F2, F3, F4) are applied to adjacent broadcast areas to prevent interference between adjacent broadcast areas.

As shown in FIG. 13 , if frequencies are allocated to multiple bands of a 24 MHz bandwidth so that interference does not occur, frequencies for national broadcasters can be deployed throughout Korea using only four multiple bands.

At this time, in addition to the four bandwidths of 24MHz used by the national broadcasters (KBS1, KBS2, EBS, MBC), local broadcasters (OBS, SBS, G1, CJB, TJB, JTV) , TBC, KBC, UBC, KNN) may require 5 bandwidths of 6 MHz base bands (f1, f2, f3, f4, f5). That is, if frequency reuse is applied in a range where there is no signal interference even for 10 local broadcasters (OBS, SBS, G1, CJB, TJB, JTV, TBC, KBC, UBC, KNN), if the basic band of 5 6MHz bandwidth is It can cover the whole country.

At this time, the unused frequency band in the 224 MHz band of UHF 470 MHz to 694 MHz allocated for terrestrial broadcasting in Korea is 98 MHz (= 224 MHz - (4 X 24 MHz + 5 X 6 MHz)).

This unused frequency band 98MHz can be appropriately divided and allocated to 4 multiple bands and/or 5 basic bands, and transmission power can be saved by increasing the data rate or lowering the modulation order by using the additionally allocated band. have.

As described above, in the method and apparatus for transmitting/receiving a broadcast signal according to the present invention, the configuration and method of the above-described embodiments are not limitedly applicable, but the embodiments are described in each embodiment so that various modifications can be made. All or part of the examples may be selectively combined and configured.

411, 413, 415, 417: Broadcasters
419: signaling information generating unit
420: transmitter
421: Multiplexing unit
423: modulator
430: antenna

Claims (15)

generating a multiplexed signal by multiplexing a first broadcast service signal corresponding to the first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service;
so that the first broadcast service and the second broadcast service share a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth , generating a transmission signal by modulating the multiplexed signal;
transmitting the transmission signal using the multiple band; and
Signaling at least one of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and frequency band information used by each of the broadcasters
Broadcast signal transmission method comprising a. delete The method according to claim 1,
A broadcast signal transmission method, wherein a guard band is excluded from at least one side of the basic bandwidth, and guard bands are used for both sides of the multiple bandwidth. The method according to claim 1,
and a multiple modulation order corresponding to the multiple bandwidth is lower than a basic modulation order corresponding to the basic bandwidth. The method according to claim 1,
The method of claim 1, wherein the first broadcast service and the second broadcast service have the same transmission output and the same broadcast transmission site. 6. The method of claim 5,
The broadcast signal transmission method, characterized in that the first broadcast service and the second broadcast service share one transmitter. receiving a broadcast signal;
extracting a multiple band signal received through a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth from the broadcast signal;
demodulating the multiple-band signal to generate a demodulated signal;
demultiplexing the demodulated signal into a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service;
extracting an additional multiple band signal corresponding to the multiple bandwidth from the broadcast signal and corresponding to a multiple band different from the multiple band; and
extracting a third broadcast service signal corresponding to a third broadcast service different from the first broadcast service and the second broadcast service from the additional multiple band signal;
Broadcast signal reception method comprising a. delete a multiplexer for generating a multiplexed signal by multiplexing a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service;
so that the first broadcast service and the second broadcast service share a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth smaller than a whole bandwidth , a modulator for generating a transmission signal by modulating the multiplexed signal;
an antenna for transmitting the transmission signal using the multiple band; and
A signaling information generator for signaling at least one of multiple information corresponding to the multiple band, information on the number of broadcasters sharing the multiple band, and information on frequency bands used by each of the broadcasters
Broadcast signal transmission apparatus comprising a. delete 10. The method of claim 9,
The broadcast signal transmission apparatus according to claim 1, wherein a guard band is excluded from at least one side of the basic bandwidth, and guard bands are used for both sides of the multiple bandwidth. 10. The method of claim 9,
and a multiple modulation order corresponding to the multiple bandwidth is lower than a basic modulation order corresponding to the basic bandwidth. 10. The method of claim 9,
The broadcast signal transmission apparatus according to claim 1, wherein the first broadcast service and the second broadcast service have the same transmission output and the same broadcast transmission site. 14. The method of claim 13,
The broadcast signal transmission apparatus according to claim 1, wherein the first broadcast service and the second broadcast service share one transmitter. An antenna for receiving a broadcast signal;
Demodulates a multiple band signal extracted from the broadcast signal and received through a multiple band corresponding to a multiple of the basic bandwidth and corresponding to a multiple bandwidth smaller than the whole bandwidth a demodulator to generate a demodulated signal;
a demultiplexer for demultiplexing the demodulated signal into a first broadcast service signal corresponding to a first broadcast service and a second broadcast service signal corresponding to a second broadcast service different from the first broadcast service; and
extracting an additional multiple band signal corresponding to the multiple bandwidth from the broadcast signal, the additional multiple band signal corresponding to a multiple band different from the multiple band, and a third different from the first broadcasting service and the second broadcasting service from the additional multiple band signal A band extractor for extracting a third broadcast service signal corresponding to the broadcast service
Broadcast signal receiving apparatus comprising a.

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