KR20180124718A - Method of transmitting broadcasting signal with bandwidth scalability using multiples of basic bandwidth and apparatus for the same - Google Patents

Abstract

Disclosed are a broadcast signal transmission/reception method applied with frequency bandwidth scalability using multiples of a default bandwidth and an apparatus for the same. According to an embodiment of the present invention, the broadcast signal transmission method includes: a step of 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; a step of generating a transmission signal by modulating the multiplexed 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 corresponding to a multiple bandwidth smaller than the whole bandwidth; and a step of transmitting the transmission signal by using the multiple band. The present invention is able to reduce unnecessary guard bands and increase frequency utilization efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast signal transmission method and a broadcast signal transmission method using frequency band extensibility using multiples of a basic bandwidth,

The present invention relates to a terrestrial TV broadcast transmission technology to which bandwidth scalability is applied, and more particularly to a technology for using a broadband UHF band as a single bandwidth while using a broader bandwidth than the existing 6, 7 and 8 MHz bandwidths. And more particularly, to a broadcasting signal transmitting / receiving technique advantageous in terms of frequency assurance.

WiB ", a wideband technology using a bandwidth of BW = 224 MHz as a whole in the UHF (Ultra-High Frequency) band 470 MHz to 694 MHz allocated to terrestrial broadcasting has been introduced.

For example, five broadcasters can transmit their own broadcasting signals at different frequencies by dividing the frequency band from 470 MHz to 694 MHz into 6 MHz bandwidth, 7 MHz or 8 MHz bandwidth, but WiB has 5 broadcasters broadcasting in a band of BW = 224 MHz It is a technique to transmit all signals.

In case of existing broadcasting, a transmission rate of about 40Mbps can be obtained at a frequency of 6MHz, 7MHz or 8MHz at an MFN (Multiple Frequency Network), and a transmission rate of about 33Mbps at a SFN (Single Frequency Network).

For example, in the case of using a bandwidth of 8 MHz in an existing broadcast, broadcasters can transmit their broadcast signals in different frequency bands. By configuring the MFN so that different frequencies are appropriately allocated and adjacent frequencies do not overlap with each other, signal interference occurring between different broadcasting stations can be prevented.

On the other hand, WiB uses all broadcast regions with the same frequency (for example, fo) and bandwidth of 224 MHz. In the WiB, all the broadcasting areas use the same frequency fo, so that broadcasting signal interference occurs between adjacent broadcasting areas. In order to overcome this interference, WiB applies a strong modulation signal such as QPSK modulation and channel coding rate CR = 1/2. Even with this low QAM order, 224MHz broadband is used, so WiB can achieve the same transmission rate as existing technology in UHF 470 ~ 694MHz band for broadcasting.

An 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 DVB-T2 system when 5 broadcasters use 470 ~ 694MHz broadcasting frequency band for broadcasting (5 transmitters), and WiB is applied and QPSK and CR = 1/2 are applied to a bandwidth of 224 MHz to obtain a transmission rate of about 200 Mbps (one transmitter), WiB is applied about 50 times (17 dB ) Lower transmission power is required. At this time, when the broadcasting signal is transmitted based on WiB, the transmission power is about 10% compared to the case where the broadcasting signal is transmitted based on DVB-T2, and thus the transmission power saving effect is 90%. At this time, WiB requires relatively lower transmission power because it is possible to apply a lower transmission power than that of DVB-T2 because the interval between signal constellations is large.

As described above, the WiB uses the entire UHF broadcast frequency band as one bandwidth, so that the frequency allocation becomes very simple. When broadcasting signals are transmitted using the existing 8 MHz bandwidth at the center frequency f1, if there are six broadcasting areas in the vicinity, in order to provide different contents for each broadcasting area, all six surrounding broadcasting areas have different center frequencies f2, ..., f7 are used to prevent mutual interference. Therefore, when applying the existing bandwidth of 6 MHz, 7 MHz or 8 MHz, a frequency channel arrangement is required.

In the case of WiB, on the other hand, all broadcasting areas use the center frequency fo equal to the bandwidth of 224 MHz. Therefore, when WiB is applied, a separate frequency allocation is not necessary since all broadcasting areas have the same center frequency fo as the same bandwidth of 224 MHz.

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

Furthermore, WiB can reduce the cost of operating a broadcasting network. In case of using the existing bandwidth of 6 MHz, 7 MHz or 8 MHz, high transmission power is required because 256 QAM modulation and channel coding rate CR = 2/3 should be applied in order to obtain a transmission rate of about 40 Mbps per broadcasting station. Providing a transmission rate of 40 Mbps per broadcast station, five broadcasters will provide a transmission rate of 200 Mbps in the entire broadcast frequency band. When WiB is applied, since a bandwidth of 224 MHz is used, a transmission rate of about 224 Mbps can be obtained by transmitting 1 bit per 1 Hz. Therefore, when the channel coding rate CR = 1/2 is applied to the QPSK modulation, 1 bit can be transmitted per 1 Hz. In this case, since the broadcast signal can be transmitted with a transmission power of about 10% as compared with the case of using 256QAM and CR = 2/3 at a bandwidth of 8 MHz in the case of WiB, 90% transmission power saving effect can be obtained.

However, when a plurality of broadcasting networks provide a plurality of broadcasting services, WiB has a problem of signal interference between broadcasting networks. Due to such signal interference, in the region where the signals transmitted from the different transmitters overlap, the broadcast signal acts as the same frequency band noise, resulting in deterioration of broadcast reception performance. Therefore, interference cancellation between adjacent broadcasting networks in WiB-based broadcasting is an important problem.

Generally, when three transmitter signals overlap each other, AWGN (Additive White Gaussian Noise) and fading channel estimation error are absent. In the WiB signal spectrum, three signals transmitted from each transmitter are overlapped. At this time, when three transmitters receive any of the signals Tx1, Tx2 and Tx3 to be transmitted, the signals received from the other two transmitters act as noise in the same frequency band. Therefore, in this case, when the signal of the specific transmitter is received, the channel is compensated through the normal channel estimation in an environment where there is twice as much noise, and the remaining error in the channel code is compensated and the normal reception should be performed.

In order to solve the signal interference problem between neighboring broadcasting areas, WiB has installed a rooftop antenna with a high directivity at a height of about 10 m, and receives only a desired signal And to remove unwanted signals. Such a technique using a directional antenna may be effective when a directional antenna such as a Yagi antenna is applied in fixed reception.

However, when mobile reception is required, it is difficult to use the Yagi antenna, and the transmission direction of the transmission signal is continuously changed, so that the technique using the directional antenna is difficult to apply.

Accordingly, there is an urgent need for a new broadcasting signal transmission technology capable of effectively eliminating interference of broadcasting signals between adjacent broadcasting areas even when mobile reception is required while utilizing the advantages of a wide band.

An object of the present invention is to effectively remove broadcast signal interference between adjacent broadcasting areas even when mobile reception is required while utilizing the advantages of broadband such as reduction of installation cost of broadcasting network, reduction of operation cost, and simplification of broadcasting frequency allocation.

It is another object of the present invention to provide a broadcasting signal transmission technique that is more efficiently applied when an existing broadcasting system is switched to a broadband bandwidth based next generation broadcasting system.

It is also an object of the present invention to reduce unnecessary guard bands to improve frequency utilization efficiency.

According to another aspect of the present invention, there is provided a method for transmitting a broadcast signal, the method comprising: receiving 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; Multiplexing and generating a multiplexed signal; 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 the whole bandwidth, Modulating the multiplexed signal to generate a transmission signal; And transmitting the transmission signal using the drain band.

In this case, the broadcasting signal transmission method may further include signaling at least one of multiples corresponding to multiple broadcasting bands, number of broadcasting stations sharing the multiple broadcasting bands, and frequency band information of each broadcasting station .

At this time, the guard band is excluded from at least one side of the basic bandwidth, and a guard band can be used on both sides of the drain bandwidth.

At this time, the drain modulation degree corresponding to the drainage bandwidth may be lower than the basic modulation order corresponding to the base band width.

At this time, the first broadcast service and the second broadcast service can have the same transmission output and the same broadcast transmission site.

At this time, the first broadcasting service and the second broadcasting service can share one transmitter.

According to another aspect of the present invention, there is provided a broadcast signal receiving method including: receiving a broadcast signal; Extracting a received multi-band signal received through a multiple band corresponding to a multiple bandwidth corresponding to a multiple of a basic bandwidth from the broadcast signal and being smaller than a whole bandwidth; Demodulating the multi-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 broadcasting signal receiving method may further include extracting an additional multiple band signal corresponding to the drain bandwidth from the broadcast signal, the additional multi band signal corresponding to a different multiple band than 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.

Also, the broadcast signal transmission apparatus according to an exemplary embodiment of the present invention may include 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 multiplexer for multiplexing and generating a multiplex signal; 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 the whole bandwidth, A modulator for modulating the multiplex signal to generate a transmission signal; And an antenna for transmitting the transmission signal using the drain band.

In this case, the broadcast signal transmission apparatus may further include a signaling information generator for signaling at least one of the drainage information corresponding to the drainage band, the number of broadcasters sharing the drainage band, and the frequency band information of each of the broadcasters can do.

At this time, the guard band is excluded from at least one side of the basic bandwidth, and a guard band can be used on both sides of the drain bandwidth.

At this time, the drain modulation degree corresponding to the drainage bandwidth may be lower than the basic modulation order corresponding to the base band width.

At this time, the first broadcast service and the second broadcast service can have the same transmission output and the same broadcast transmission site.

At this time, the first broadcasting service and the second broadcasting service can share one transmitter.

Also, a broadcast signal receiving apparatus according to an embodiment of the present invention includes: an antenna for receiving a broadcast signal; Demodulating a demultiplexed signal received from the broadcast signal through a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth that is less than a whole bandwidth, A demodulator for generating a demodulated signal; And a demultiplexer for demultiplexing the demodulated signal into a first broadcast service signal corresponding to the first broadcast service and a second broadcast service signal corresponding to the second broadcast service different from the first broadcast service.

According to the present invention, it is possible to effectively remove the interference of broadcasting signals between adjacent broadcasting areas even when mobile reception is required while utilizing the advantages of broadband such as reduction of installation cost of broadcasting network, reduction of operation cost, and simplification of broadcasting frequency allocation.

In addition, the present invention can provide a broadcasting signal transmission technique that is more efficiently applied when switching from an existing broadcasting system to a next generation broadcasting system based on a wideband bandwidth.

In addition, the present invention can reduce an unnecessary guard band and increase the frequency utilization efficiency.

1 and 2 are views illustrating a 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 block diagram 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.
FIG. 6 is a diagram illustrating an example of a broadcast signal receiving apparatus according to an embodiment of the present invention. Referring to FIG.
7 is a diagram illustrating frequency allocation of a drain bandwidth according to an embodiment of the present invention.
8 and 9 are diagrams illustrating frequency utilization efficiency of a broadcast signal transmission method according to an embodiment of the present invention.
10 is a flowchart illustrating a method of transmitting a broadcast signal according to an exemplary embodiment of the present invention.
11 is a flowchart illustrating a method of receiving a broadcast signal according to an embodiment of the present invention.
FIG. 12 is a diagram illustrating an example in which a broadcasting signal transmission method according to an embodiment of the present invention is applied to the Seoul area of Korea.
FIG. 13 is a diagram illustrating an example in which a broadcasting signal transmission method according to an embodiment of the present invention is applied to national broadcasting in Korea.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

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

The present invention provides bandwidth scalability using a multiple bandwidth of less than 224 MHz, which is a whole bandwidth, with 6 MHz, 7 MHz, or 8 MHz being used as a basic bandwidth, And to a technique for providing the same.

For example, if there are four broadcasters broadcasting national broadcasting in countries using 6 MHz bandwidth in terrestrial broadcasting, and their broadcasting areas (transmission signal output) and transmission sites are the same, A bandwidth of 24 MHz (= 4 X 6 MHz) is available. In this case, since four broadcasters can share one broadcasting transmitter, the installation cost of the broadcasting network is reduced to one quarter. However, when the broadcasting areas are different from each other or the transmission sites are different from each other, it may be difficult to apply the wide bandwidth by combining the bandwidths.

The present invention is a technique that can solve the signal interference problem between adjacent broadcasting networks while utilizing the advantages of WiB technology. Furthermore, when switching from the existing broadcasting system to the next generation broadcasting system based on the wideband bandwidth, it is easy to secure the frequency for the next generation broadcasting system by using the multiple bandwidth of 6 MHz, 7 MHz or 8 MHz band currently in use.

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

Referring to FIG. 1, unlike a case where a broadcast UHF channel 224 MHz is used as a whole bandwidth, a multiple bandwidth of 32 MHz (= 8 MHz X 4) is used in a country using a baseband of 8 MHz It can be seen that interference between broadcast signals of adjacent broadcast areas can be avoided since adjacent broadcast areas can use different frequencies.

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

In FIGS. 1 and 2, the drain bandwidth corresponding to four times is taken as an example, but this is only an example, and the technical idea of the present invention is not limited to a multiple of four times.

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

3, four broadcasting stations 311, 313, 315 and 317 are connected to four transmitters 321, 323, 325 and 327 having a basic bandwidth of 8 MHz and four transmit antennas 331, 333, 335, 337 are used to transmit broadcast signals.

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

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

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

At this time, the transmitter 420 includes a multiplexer 421 and a modulator 423.

In the example of FIG. 4, four broadcasting stations 411, 413, 415 and 417 transmit signals to the transmitter 1 (411, 413, 415 and 417) when four broadcasting stations 411, 413, 415 and 417 share a multiple- It is possible to transmit the broadcasting signal by sharing the broadcasting signal.

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

The modulator 423 modulates the broadcast services corresponding to the broadcasting stations 411, 413, 415 and 417 to a multiple bandwidth corresponding to a multiple of the basic bandwidth and smaller than the whole bandwidth. Modulates the multiplexed signal to generate a transmit signal so as to share a corresponding multiple band.

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

In this case, the broadcast signal transmission apparatus may further include a signaling information generation unit 419. In this case, the signaling information generator 419 can signal any one or more of the drainage information corresponding to the drainage band, the number of broadcasters sharing the drainage band, and the frequency band information of each of the broadcasters. At this time, the frequency band information of each broadcasting company may be frequency band information allocated to each broadcasting company within the frequency band.

At this time, a guard band is excluded from at least one side of the basic bandwidth, and a guard band can be used on both sides of the drain bandwidth.

At this time, the drain modulation degree corresponding to the drain bandwidth may be lower than the basic modulation order corresponding to the base band width. Therefore, when the drain bandwidth is used, low transmission power can be used, thereby reducing transmission power.

At this time, the broadcasting stations 411, 413, 415, and 417 may have the same transmission output and the same broadcasting transmission site. At this time, 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, a broadcasting signal transmission apparatus according to an embodiment of the present invention includes a transmitter 520 and an antenna 530.

At this time, 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, two broadcasters 511 and 513 may share a transmitter and transmit a broadcast signal.

At this time, the broadcast signal transmission apparatus may further include a signaling information generation unit 519. In this case, the signaling information generator 519 may signal any one or more of the drainage information corresponding to the drainage band, the number of broadcasters sharing the drainage band, and the frequency band information of each of the broadcasters.

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

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

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

An antenna 630 receives a broadcast signal.

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

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

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

In this case, the demodulation unit 621 or the demultiplexing unit 623 demultiplexes the demultiplexed information corresponding to the demultiplexed signals signaled from the transmitter, the number information of the broadcasting stations sharing the demultiplexed band, Any one or more of them can be operated.

At this time, the receiver 620 extracts an additional multi-band signal corresponding to the multi-channel bandwidth corresponding to the multi-channel multi-band, 615, and 617, which are different from each other.

7 is a diagram illustrating frequency allocation of a drain bandwidth according to an embodiment of the present invention.

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

When there are seven neighboring broadcasting areas around the specific broadcasting area, seven different frequency bands (multiples) should exist within the 224 MHz band of the broadcasting frequency 470 MHz to 694 MHz. Therefore, a frequency band of 32 MHz (= 224 MHz / 7) becomes a multiple band, and a MFN broadcasting network of 32 MHz can be constructed.

For example, in a DVB-T2 system with a bandwidth of 8 MHz, 256 QAM and a channel coding rate CR = 2/3, the data rate is about 42.5 (= 5.31 X 8) Mbps since the spectral efficiency is 5.31 bits / Hz . If the bandwidth is expanded to 32 MHz, the frequency efficiency becomes 1.33 bits / Hz even when QPSK and the channel coding rate CR = 2/3 are applied, so that a transmission rate of about 42.5 Mbps (= 1.33 X 32) can be obtained.

The QPSK and the channel coding rate CR = 2/3 based on the DVB-T2 system is about 4.9 dB for the QFA (Quasi Error Free) carrier-to-noise ratio (CNR) on the Rayleigh channel. The 256QAM and the channel coding rate CR = 2/3 are about 20.1dB for the QEF CNR on the Rayleigh channel. Therefore, when QPSK modulation is applied at the same transmission rate, a QEF CNR gain of about 15.2dB is obtained as compared with the case of using 256QAM. In this case, a transmission power of about 6% is required for the same data rate, and a power saving of 94% can be obtained, compared with the case of a bandwidth of 8 MHz, 256 QAM, and CR = 2/3.

If 16QAM and channel coding rate CR = 2/3 are applied, the QEF CNR in the Rayleigh channel is about 10.8dB. Therefore, when a 16QAM signal is applied, a QEF CNR gain of about 9.3dB is obtained as compared with a case where a 256QAM signal is applied. In this case, a transmission power of about 23% is required for the same data rate, and a power saving of 77% can be obtained, compared with the case of bandwidths of 8 MHz, 256 QAM and CR = 2/3. When 16QAM is applied, the QEF CNR gain is reduced to about 1/2 as compared with the case where QPSK is applied, but it is possible to obtain twice the data transmission rate.

The multiple bandwidths according to an embodiment of the present invention have the following advantages.

- Reduced transmission power

If a broadcaster adopts 32MHz bandwidth instead of 8MHz bandwidth and obtains a transmission rate of about 42.5Mbps, QPSK can be applied instead of 256QAM, which can greatly reduce the transmission power. As described above, in the case of the same channel coding rate, the QPSK modulation obtains a QEF CNR gain of 15.2dB compared with 256QAM, so that a very large transmission power saving effect can be obtained for the same broadcasting domain.

- Reduction of broadcasting network construction cost and operation cost

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

- Flexibility to switch broadcasting system

The case of using the drain bandwidth is advantageous in securing the frequency when switching the broadcasting system, compared with the case of using the bandwidth of 224 MHz. When using a bandwidth of 224 MHz, it is difficult to avoid interferences between broadcasting networks using existing bandwidths of 6 MHz, 7 MHz, or 8 MHz broadcasting network and 224 MHz broadband bandwidth because existing broadcasting networks and frequency bands overlap. However, in case of using the drain bandwidth, it is advantageous in comparison with the WiB when the broadcasting system is switched because it can use the frequency of the band which does not overlap with the band used in the 6 MHz, 7 MHz or 8 MHz broadcasting network which is the basic frequency band.

- Improved frequency utilization efficiency

The OFDM transmission system establishes a guard band that does not send data to both ends of the frequency spectrum but leaves it empty to avoid interference with adjacent broadcast bands. The more the guard band is, the more the frequency band in which data is not transmitted increases, so that the frequency utilization efficiency is lowered. A system using the existing 6 MHz, 7 MHz or 8 MHz bandwidth sets the guard band applied to OFDM modulation for each bandwidth. On the other hand, a broadcasting system using a wide bandwidth can minimize a guard band setting, thereby increasing a frequency utilization rate.

8 and 9 are diagrams illustrating frequency utilization 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 the case of using 8 MHz basic bandwidth uses four times more guard band than the case of using a 32 MHz multiple bandwidth.

Therefore, the frequency utilization efficiency is higher in the case of FIG. 9 than in the case of FIG.

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

10, a method of transmitting a broadcast signal according to an exemplary embodiment of the present invention includes a first broadcast service signal corresponding to a first broadcast service, a second broadcast service corresponding to a second broadcast service different from the first broadcast service, The service signal is multiplexed to generate a multiplex signal (S1010).

Also, the broadcast signal transmission method according to an exemplary embodiment of the present invention is characterized in that the first broadcast service and the second broadcast service are divided into a plurality of basic bandwidths and a plurality of sub-bandwidths the transmission signal is generated by modulating the multiplexed signal so as to share a multiple band corresponding to a multiple bandwidth (S1020).

In addition, the broadcasting signal transmission method according to an embodiment of the present invention transmits the transmission signal using the drain band (S 1030).

At this time, the broadcasting signal transmission method according to an exemplary embodiment of the present invention may include at least one of multiples corresponding to the multiples, number of broadcasting stations sharing the multiples, and frequency band information of each broadcasting station And signaling.

At this time, a guard band is excluded from at least one side of the basic bandwidth, and a guard band can be used on both sides of the drain bandwidth.

At this time, the drain modulation degree corresponding to the drain bandwidth may be lower than the basic modulation order corresponding to the base band width.

At this time, the first broadcast service and the second broadcast service may have the same broadcast transmission site as the same transmission output.

At this time, the first broadcasting service and the second broadcasting service can share one transmitter.

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

Referring to FIG. 11, a broadcast signal receiving method according to an embodiment of the present invention receives a broadcast signal (S 1110).

Also, a method of receiving a broadcast signal according to an exemplary embodiment of the present invention includes receiving a broadcast signal corresponding to a multiple of a basic bandwidth and a multiple band corresponding to a multiple bandwidth that is less than a whole bandwidth and extracts the received multi-band signal through the multiple band (S1120).

In addition, the broadcasting signal receiving method according to an embodiment of the present invention demodulates the multi-band signal to generate a demodulation signal (S1130).

The method of receiving a broadcast signal according to an exemplary embodiment of the present invention may further include receiving a demodulation signal including 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, Demultiplexed into a signal (S1140).

In this case, the broadcasting signal reception method according to an embodiment of the present invention may include extracting an additional multi-band signal corresponding to the multi-channel bandwidth corresponding to the multi-channel bandwidth, 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.

It may be advantageous in terms of frequency allocation to apply an integer multiple band of 6 MHz, 7 MHz, or 8 MHz, which is the frequency bandwidth for terrestrial broadcasting currently being used in each country, in the broadcast signal transmission method using the drain bandwidth according to an embodiment of the present invention. This is because the frequency allocation of the existing terrestrial broadcasting is 6 MHz, 7 MHz, or 8 MHz. If a new frequency bandwidth A (A is any positive integer) MHz is applied, it requires a new frequency allocation in A MHz, which is expensive and time consuming. Therefore, it is effective to use an integer multiple bandwidth of this basic band by using a conventional bandwidth of 6 MHz, 7 MHz, or 8 MHz as a basic unit. Broadcasters can share one transmitter by arranging the basic frequency bands to be used consecutively and integrating them into one multiple band.

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

Referring to FIG. 12, it can be seen that transmitters are installed in Gwanak, Yongmoon and Gyeyang for broadcasting in Seoul.

At this time, the broadcasters for broadcasting in Seoul can be KBS1, KBS2, EBS and MBC, and two local broadcasting companies, SBS and OBS.

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

At this time, if the conditions of all national broadcasters (KBS1, KBS2, EBS, MBC) are made the same by installing the transmission station of EBS in Gyeyang for four national broadcasting companies, four national broadcasting companies (KBS1 , KBS2, EBS, and MBC have the same transmission output and the same broadcasting transmission site. At this time, national broadcasters (KBS1, KBS2, EBS, and MBC) can integrate each basic bandwidth of 6MHz and apply a single drain bandwidth of 24MHz (= 4X6MHz). If one multiple bandwidth is shared, four national broadcasters (KBS1, KBS2, EBS, and MBC) can share one transmitter, thus reducing the installation cost and operating cost of the broadcasting network by a quarter.

Two local broadcasters (SBS, OBS) have different broadcasting areas. In other words, SBS will be Seoul broadcasting area, OBS broadcasting area will be Incheon and Gyeonggi area. Further, since the broadcasting transmitter sites and the transmission outputs of the 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.

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

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

At this time, four national broadcasters (KBS1, KBS2, EBS, MBC) can use a single 24 MHz multiple bandwidth. At this time, multiples of different frequencies (F1, F2, F3, F4) are applied to adjacent broadcast areas so that interference does not occur between adjacent broadcast areas.

As shown in FIG. 13, if frequency is allocated to multiple bands of the 24 MHz bandwidth so that interference does not occur, frequency allocation for national broadcasters across the Republic of Korea is possible with only four multiple bands.

In this case, in addition to the four bandwidths of 24 MHz used by the national broadcasters (KBS1, KBS2, EBS, and MBC), local broadcasting stations (OBS, SBS, G1, CJB, TJB, JTV , Basic bandwidths (f1, f2, f3, f4, f5) of 5 MHz bandwidth of 6 MHz for the TBC, KBC, UBC, KNN may be required. That is, if frequency reuse is applied to 10 local broadcasters (OBS, SBS, G1, CJB, TJB, JTV, TBC, KBC, UBC, KNN) without signal interference, It can cover the whole country.

At this time, the frequency band not used 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 98 MHz can be appropriately divided to be allocated to four multiple bands and / or five base bands, and additional allocated bands can be used to increase the data rate or decrease the modulation order to reduce the transmission power have.

As described above, the method and apparatus for transmitting / receiving a broadcasting signal according to the present invention are not limited to the configuration and method of the embodiments described above, but the embodiments can be applied to various embodiments All or some of the examples may be selectively combined.

411, 413, 415, 417: broadcasters
419: Signaling information generation section
420: Transmitter
421:
423:
430: antenna

Claims (15)

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;
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 the whole bandwidth, Modulating the multiplexed signal to generate a transmission signal; And
Transmitting the transmission signal using the multiple band;
And transmitting the broadcast signal. The method according to claim 1,
Signaling the at least one of the drainage information corresponding to the drainage band, the number of broadcasters sharing the drainage band, and the frequency band information of each of the broadcasters
Further comprising the steps of: The method according to claim 1,
Wherein a guard band is excluded in at least one side of the basic bandwidth and a guard band is used in both sides of the drain bandwidth. The method according to claim 1,
And a drain modulation degree corresponding to the drain bandwidth is lower than a basic modulation order corresponding to the base band width. The method 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. The method of claim 5,
Wherein the first broadcast service and the second broadcast service share one transmitter. Receiving a broadcast signal;
Extracting a received multi-band signal received through a multiple band corresponding to a multiple bandwidth corresponding to a multiple of a basic bandwidth from the broadcast signal and being smaller than a whole bandwidth;
Demodulating the multi-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
And transmitting the broadcast signal. The method of claim 7,
Extracting an additional multiple band signal corresponding to the multiple band 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;
Further comprising the steps of: A multiplexer for 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 to generate a multiplex signal;
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 the whole bandwidth, A modulator for modulating the multiplex signal to generate a transmission signal; And
An antenna for transmitting the transmission signal using the drain band;
Wherein the broadcast signal transmission apparatus comprises: The method of claim 9,
A signaling information generating unit for signaling at least one of the multiples corresponding to the multiple band, the number of broadcasting stations sharing the multiple band, and the frequency band information of each of the broadcasting stations,
Wherein the broadcast signal transmission apparatus further comprises: The method of claim 9,
Wherein a guard band is excluded from at least one side of the basic bandwidth and a guard band is used on both sides of the drain bandwidth. The method of claim 9,
And a drain modulation degree corresponding to the drain bandwidth is lower than a basic modulation order corresponding to the base band width. The method of claim 9,
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,
Wherein the first broadcast service and the second broadcast service share one transmitter. An antenna for receiving a broadcast signal;
Demodulating a demultiplexed signal received from the broadcast signal through a multiple band corresponding to a multiple of a basic bandwidth and a multiple bandwidth that is less than a whole bandwidth, A demodulator for generating 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,
The broadcast signal receiving apparatus comprising:

Images