KR100713664B1 - Terrestrial DMB Broadcasting System and Method Using Satellite Path and Frame Composition Method therefor - Google Patents

Abstract

 The terrestrial DMB system disclosed herein uses a repeater using a satellite link as a gap filler for terrestrial DMB. Since the transmit and receive signals of the repeater using the satellite link have different frequency bands, the existing RF repeater or the optical link type repeater prevents oscillation of a signal generated by using the transmit and receive signals of the same band. Therefore, the degree of freedom for the installation and reception antenna of the gap filler is increased, the size and cost of the gap filler facility is reduced. In addition, the terrestrial DMB system according to the present invention also transmits and receives additional information such as transmitter identification information (TII) to a signal transmitted and received through the gap filler. Accordingly, the receiver can accurately provide information on which path the terrestrial DMB service is provided, thereby solving the billing problem for the terrestrial DMB service.

Terrestrial Broadcasting System, DAB, DMB, Gap Filler

Description

Terrestrial DMB broadcasting system and method using satellite path and frame composition method for it {APPARATUS AND METHOD FOR TERRESTRIAL DIGITAL MULTIMEDIA BROADCASTING USING SATELLITE DATA PATH, AND FRAMING METHOD FOR THE SAME}

1 is a view showing the configuration of a typical terrestrial DMB system;

2 is a view showing the overall configuration of a satellite-based terrestrial DMB system according to a preferred embodiment of the present invention;

3 is a block diagram showing the configuration of a ground station according to a preferred embodiment of the present invention shown in FIG.

4 is a block diagram showing a detailed configuration of a symbol generator and a TDM frame generator shown in FIG. 3;

5 is a view showing the structure of an OFDM transmission frame (OFDM_TF) as defined in the ETS 300 401 standard;

로 표현한 도면;FIG. 6 shows the unit output of the byte multiplexer shown in FIG.

Represented by;

7 is a flowchart illustrating a method of generating a TDM frame according to an exemplary embodiment of the present invention, which is performed by the TDM frame generation unit shown in FIG. 4;

FIG. 8 is a diagram illustrating a structure of a TDM frame according to the generation process of the TDM frame shown in FIG. 7; FIG.

9 is a view showing a configuration example of a TDM frame according to the present invention when there are six terrestrial DMB ensembles; And

FIG. 10 is a block diagram illustrating a configuration of a gap filler according to a preferred embodiment of the present invention shown in FIG. 2.

 * Description of the symbols for the main parts of the drawings *

10: ground station 110: ground station

111: DMB signal receiver 113: symbol generator

115: TDM frame generation unit 117: TDM transmission unit

120: satellite 130: gap filler

131: TDM receiver 135: terrestrial DMB frame generator

137-1 to 137-N: OFDM transmitter 100, 200: terrestrial DMB system

The present invention relates to a terrestrial broadcasting system, and more particularly, to a terrestrial digital multimedia broadcasting (terrestrial DMB) system.

DMB (Digital Multimedia Broadcasting) is a digital multimedia broadcasting capable of providing CD-quality sound and data or video services, and providing excellent fixed and mobile reception quality. DMB is classified into terrestrial DMB and satellite DMB according to a transmission method and a service area. Satellite DMB uses UHF (Ultra High Frequency) in the 1400 to 2700 MHz frequency band via satellite, while Terrestrial DMB uses VHF (Ultra High Frequency) with a frequency band of about 200 MHz on the ground without going through satellite. Provide service.

1 is a diagram illustrating a configuration of a general terrestrial DMB system 100.

Referring to FIG. 1, the terrestrial DMB system 100 transmits an Orthogonal Frequency Division Multiplexing (OFDM) signal in a 200 MHz band from a terrestrial broadcasting station 10 such as a Gwanak transmission station or a Namsan transmission station. The portable and vehicle receivers or fixed receivers having mobility located in the reception area 20 are configured to receive terrestrial broadcasting station signals and receive terrestrial DMB services. However, the receiver will not receive radio waves if it is blocked by subway, building, or obstacles. Such an area where radio waves cannot be received is called an unreceivable area or a gap 30. A repeater is generally used to transmit a radio wave to the radio wave reception impossible region 30. The repeater is called a gap filler to fill a gap of radio wave reception.

The repeater may be classified into a radio frequency (RF) repeater and an optical link repeater (or an optical repeater) according to a medium through which a signal is transmitted. The RF repeater receives a signal through RF, and the optical link repeater or optical repeater receives a signal through light. In the case of using an RF repeater as a gap filler in a terrestrial DMB, the RF repeater receives an RF signal in the 200 MHz frequency band and amplifies it immediately. Therefore, the signal can be relayed without oscillation only when sufficient isolation is secured between the receiving antenna and the transmitting antenna. In order to secure the isolation of the transmitting and receiving antennas, spatial separation is required, which brings a lot of constraints on the installation space. On the contrary, when the optical link type repeater is used as the gap filler in the terrestrial DMB, since the optical path is used for signal transmission, the isolation between the transmitting and receiving antennas can be secured by the optical line distance. However, in the case of the optical link type repeater, there is a limit that sufficient isolation can be secured only when the length of the optical line is connected by several Km to several tens of Km. As such, in order to prevent oscillation of the signal, the gap and the antenna must be sufficiently spaced apart from the transmission antenna and the reception antenna of the gap filler. This method increases the space occupied by the gap filler and is difficult to apply due to the difficulty in installation. There is. The installation problem of such a gap filler is expensive.

 At the time of introduction of DMB service, it was suggested that satellite DMB should be paid and terrestrial DMB which had fewer services than satellite DMB was free. However, as satellite DMB, terrestrial DMB is required to install gap fillers in order to provide DMB service in unreceivable areas, so the debate about terrestrial DMB service is emerging. This debate on terrestrial DMB service is soon associated with the problem of billing (billing) for terrestrial DMB service. Therefore, there is a need for a new method that can provide accurate information on in which region the terrestrial DMB service is provided and through which gap filler.

Accordingly, an object of the present invention has been proposed to solve the above-mentioned problems, and a terrestrial DMB system and method using a repeater using a satellite link as a gap filler for terrestrial DMB, instead of a conventional RF repeater or an optical link repeater. To provide.

Another object of the present invention is to provide a terrestrial DMB system and method capable of accurately providing information on which path a terrestrial DMB service is provided through.

Another object of the present invention is to provide a frame configuration method for converting a terrestrial DMB frame into a satellite-based TDM frame to provide a satellite-based terrestrial DMB service.

(Configuration)

 According to a feature of the present invention for achieving the object of the present invention as described above, the terrestrial DMB system is a terrestrial DMB system includes a terrestrial data path for transmitting a terrestrial DMB signal of the first type to a plurality of receivers through a terrestrial transmitting station; And a satellite data path for transmitting a terrestrial DMB signal of the second type to the gap filler, converting the terrestrial DMB signal of the second type received by the gap filler into the terrestrial DMB signal of the first type, and transmitting the signal to the plurality of receivers. Characterized in that it comprises a.

According to another aspect of the present invention for achieving the object of the present invention as described above, the method for configuring a terrestrial DMB system (a) transmits a terrestrial DMB signal of the first type to a plurality of receivers through a terrestrial transmitting station, Simultaneously transmitting a terrestrial DMB signal of a second type to the gap filler via satellite; And (b) converting the terrestrial DMB signal of the second type received by the gap filler into the terrestrial DMB signal of the first type and transmitting the same to the plurality of receivers.

In a preferred embodiment, the terrestrial DMB signal of the first type is an Orthogonal Frequency Division Multiplexing (OFDM) signal, and the terrestrial DMB signal of the second type is the terrestrial DMB signal of the first type. Characterized in that it is a time division multiplex (TDM) signal having a higher frequency band.

In a preferred embodiment, the satellite data path includes a ground station that converts the terrestrial DMB signal of the first type into a terrestrial DMB signal of the second type and transmits it to the gap filler, wherein the ground station is the terrestrial wave of the first type. The terrestrial DMB signal of the second type is generated by using the terrestrial DMB signal of the third type immediately before being modulated into the DMB signal.

According to another aspect of the present invention for achieving the object of the present invention as described above, the frame configuration method for a terrestrial DMB system includes (a) a plurality of unit data to match the starting point of each terrestrial DMB frame; Assigning to a time division multiplexing (TDM) frame; (b) determining the number of unit data constituting the time division multiplex frame; (c) inserting the respective terrestrial DMB signals into the respective unit data regions; (d) inserting a sync word (SYNC_WORD) and ensemble data (ENS (C, N)) into positions where the respective terrestrial DMB signals start in the unit data, respectively; and (e) each And inserting synchronization information between unit data of.

In an exemplary embodiment, when an empty space exists in the unit data, a FILL byte is inserted into the empty space.

In a preferred embodiment, the number of unit data constituting the time division multiplex frame is a multiple of eight.

In a preferred embodiment, if the number of unit data is not a multiple of eight, the FILL block is added to the end of the unit data so that the number of unit data is a multiple of eight.

In a preferred embodiment, the inverted synchronization information is inserted into the first unit data and every eighth unit data after the first unit data.

In a preferred embodiment, the step (c) includes (c-1) transmitter identification information (TII) or null symbol, phase reference symbol (PRS), fast information channel (FIC) symbol, and MSC ( Generating a Main Service Channel) symbol; (c-2) mapping the transmitter identification information (TII) and the phase reference symbol (PRS) to a first mapping scheme, respectively; (c-3) mapping the fast information channel (FIC) symbols and the main service channel (MSC) symbols in a second mapping scheme, respectively; And (c-4) multiplexing the mapping results and storing the mapping results in the reference data area.

일 때,

=가 1, 2, 3, …, 767, 768, -768, -767, …, -2, -1의 순서를 따라 바이트 단위의 다중화가 수행되는 것을 특징으로 한다.In a preferred embodiment, in the step (c-4), the subcarrier index of the terrestrial DMB signal is

when,

= 1, 2, 3,... , 767, 768, -768, -767,... , Multiplexing in units of bytes is performed in the order of -2, -1.

In a preferred embodiment, in the step (c-4), the mapping result performed in the step (c-2) is to fill the data by 2 bits in order from the MSB bit of the multiplexed byte do.

In a preferred embodiment, in the step (c-4), the mapping result performed in the step (c-3) is to fill the data by 1 bit in order from the MSB bit of the multiplexed byte do.

(Example)

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

The novel terrestrial DMB system of the present invention is a satellite-based repeater using a satellite link using transmit and receive signals of different frequency bands, instead of a conventional RF repeater or an optical link repeater using transmit and receive signals of the same frequency band. Is used as a gap filler for terrestrial DMB. Therefore, oscillation of the signal generated by the gap filler is prevented at the source, thereby increasing the degree of freedom for the installation and reception antenna of the gap filler, it is possible to reduce the size and cost of the gap filler facility. In the terrestrial DMB system according to the present invention, since additional information such as transmitter identification information (TII) is transmitted and received through a gap filler, the receiver can accurately provide information on which path the terrestrial DMB service is provided. Therefore, the billing problem for terrestrial DMB service can be solved.

 2 is a view showing the overall configuration of a satellite-based terrestrial DMB system 200 according to a preferred embodiment of the present invention.

Referring to FIG. 2, a path of a DMB signal provided by the terrestrial DMB system 200 according to the present invention is largely divided into a ground path 50 and a satellite path 150. The terrestrial path 50 is the same path as the terrestrial DMB path shown in FIG. 1 and is a path that a receiver located in the reception area 20 receives an OFDM signal transmitted from the terrestrial transmitting station 10. The satellite path 150 provides a DMB signal to an unreceivable region or a gap 30 area in which the gap filler 130 using the satellite path cannot directly receive the OFDM signal transmitted from the terrestrial transmitting station 10. This is the path. As will be described in detail below, the gap filler 130 according to the present invention is a satellite-based relay system of a completely different method from the conventional RF repeater and optical link repeater. In the satellite-based relay system, through which additional information (for example, transmitter identification information (TII), etc.) inserted during transmission of the terrestrial DMB signal using satellite, the path through which the receiver receives the terrestrial DMB service is provided. Can accurately provide information about

Looking at the configuration and operation of the satellite path 150 of the terrestrial DMB system 200 according to the present invention. The ground station 110 receives the terrestrial DMB signal from the terrestrial transmitting station 10 or a broadcasting station (not shown) and performs time division multiplexing (TDM) modulation. Then, the modulated TDM signal is transmitted to the satellite 120 through an uplink Ku-Band (or Ka-Band) band of 11 or 12 GHz. The satellite 120 receives the TDM signal from the ground station 110 and retransmits it to the ground through the downlink Ku-Band (or Ka-Band) band. The gap filler 130 receives a TDM signal transmitted from the satellite 120 and converts the TDM signal into a terrestrial DMB signal. Then, the converted terrestrial DMB signal is modulated by OFDM and transmitted. The OFDM signal transmitted by the gap filler 130 has a frequency band of 200 MHz similarly to the signal transmitted from the terrestrial transmitting station 10.

As can be seen from the above, the transmission / reception signal of the gap filler 130 using the satellite path according to the present invention does not use the transmission / reception signal of the same band as the conventional RF repeater and the optical link repeater. A TDM signal (for example, 11 or 12 GHz) in a band (or Ka-Band) is received, and an OFDM signal in a 200 MHz band is transmitted. Therefore, the terrestrial DMB system 200 according to the present invention has an advantage of fundamentally preventing oscillation caused by the transmission / reception signal of the gap filler using the same frequency band. Therefore, the restriction on the installation and reception antenna of the gap filler is reduced, the size of the gap filler facility is reduced. In addition, the gap filler can be easily installed in an area capable of receiving satellite signals.

 In order to implement the satellite-based terrestrial DMB system 200 according to the present invention, a process of converting a terrestrial DMB signal to be transmitted to the gap filler 130 into a TDM signal of an uplink Ku-Band (or Ka-Band) and a gap filler 130 A process of converting a TDM signal of a downlink Ku-Band (or Ka-Band) received into a Tx signal to an OFDM signal is needed. First, a process of converting a terrestrial DMB signal to be transmitted to the gap filler 130 into a TDM signal of an uplink Ku-Band (or Ka-Band) is as follows.

3 is a block diagram showing the configuration of the ground station 110 according to the preferred embodiment of the present invention shown in FIG. 2, and shows a configuration for converting a terrestrial DMB signal into a TDM signal. The TDM signal converted at the ground station 110 is transmitted to the gap filler 130 via the satellite 120.

Referring to FIG. 3, the ground station 110 includes a DMB signal receiver 111, a symbol generator 113, a TDM frame generator 115, and a TDM transmitter 117. The DMB signal receiver 111 receives a terrestrial DMB signal from the terrestrial transmitting station 10 or a broadcasting station (not shown). In this case, the received terrestrial DMB signal has a compressed data format such as MPEG. The symbol generator 113 may use OFDM symbols (for example, transmitter identification information (TII), a null symbol (N_S), and a phase reference symbol (Phase) necessary to construct an OFDM frame using the received terrestrial DMB signal). Reference (PR_S), FIC symbol (Fast Information Channel), MSC symbol (Main Service Channel), etc. (see Figs. 4 and 5) The TDM frame generator 115 is generated from the symbol generator 113. TDM frames are generated by rearranging the OFDM symbols, and the TDM frames generated by the TDM frame generator 115 are transmitted to the satellite 120 through the TDM transmitter 117. ETS 300 401 Standard According to the present invention, the OFDM symbols generated by the symbol generator 113 become OFDM signals only after undergoing an OFDM modulation process through a separate device such as an OFDM signal generator. Terrestrial DMB signals processed are converted into OFDM signals. Therefore, the TDM frame generator 115 generates a TDM signal using OFDM symbols before OFDM modulation is performed instead of the modulated OFDM signal, and the terrestrial DMB signal used at this time is used. An ETI (Ensemble Transport Interface) signal or another type of signal may be used.

4 is a block diagram illustrating a detailed configuration of the symbol generator 113 and the TDM frame generator 115 shown in FIG. 3. Referring to FIG. 4, the symbol generator 113 includes a TII symbol generator 1131, a NULL symbol generator 1133, a phase reference symbol (PR_S) generator 1135, a fast information channel (FIC), and an MSC ( Main Service Channel) symbol generator 1137, and a null multiplexer (NULL Mux) 1139. The symbols generated by the symbol generator 113 are symbols required to configure an OFDM frame and are defined in the ETS 300 401 standard, which is a standard for OFDM signals. Before examining the detailed configuration of the symbol generator 113, the structure of the OFDM frame defined in the ETS 300 401 standard is as follows.

 5 is a diagram illustrating a structure of an OFDM transmission frame (OFDM_TF) defined in the ETS 300 401 standard.

Referring to FIG. 5, an OFDM transport frame (OFDM_TF) is composed of a synchronization channel (SC), a fast information channel (FIC), and a main service channel (MSC) (where T _F is a parameter indicating the width of the transmission frame). The Sync Channel (SC) is used for basic demodulation functions such as Transmission Frame Synchronization, Automatic Frequency Control, Channel State Estimation, and Transmitter Identification in the transmission system. Used internally. The fast information channel (FIC) is used for quick access of information by the receiver and the main service channel (MSC) is used for the transmission of voice and service data. Each channel is composed of several symbols. In the sync channel SC, a null symbol N_S or transmitter identification information TII is stored, and a phase reference symbol PR_S is stored. The fast information channel (FIC) and the main service channel (MSC) include a guard interval (Δ) 202 and a plurality of OFDM symbols (OFDM_S) consisting of the pure signal portion 204 of the OFDM symbols.

Referring back to FIG. 4, the transmitter identification information TII and the null symbol N_S generated from the TII symbol generator 1131 and the NULL symbol generator 1133 of the symbol generator 113 are null multiplexers 1139. Is entered. The null multiplexer 1139 selects and outputs any one of transmitter identification information TII and a null symbol N_S as information to be stored in a synchronization channel SC of an OFDM frame. Transmitter identification information (TII) may be assigned the ground station 110 identification information so that only a specific receiver can receive the transmission signal of the gap filler using the satellite link. This is a method in which a pay receiver or subscriber can receive a signal through a gap filler when a terrestrial DMB service is paid later. Transmitter identification information (TII) may be transmitted from the ground station to all the gap fillers through the satellite link so that all the gap fillers may transmit the same transmitter identification information, but each gap filler may generate and transmit the transmitter identification information.

은 한 프레임 동안의 OFDM 심볼 인덱스로, 0, 1, 2, …, 75의 값을 가진다. The symbols or channels generated by the symbol generator 113 are symbols used when composing a terrestrial DMB signal into a TDM frame. The terrestrial DMB signal used to generate the TDM frame, the value of the signal, the number of bits for expressing the value, and the amount of data for one frame (96ms) are displayed. same. Where k is the sub-carrier index of the OFDM symbol, -768, -767,... , -1, 1,... , 767, 768. And,

Is the OFDM symbol index for one frame, where 0, 1, 2,... , Has a value of 75.

중 하나로 표현된다. 따라서, 1 비트의 데이터(예를 들면, 0, 1)를 사용하여 하나의 값을 표현한다. 이때, 각 신호에 대한 매핑 결과는 [표 2]와 같다. Referring to [Table 1], a null symbol, a transmitter identification information (TII), and a phase reference symbol signal are represented by one of -1, 0, and 1, respectively. Therefore, two bits of data (e.g., 00, 01, 11) are used to represent one value. In contrast, the fast information channel (FIC) and the main service channel (MSC) have the I and Q signals respectively.

Expressed as one of Therefore, one bit of data (for example, 0, 1) is used to represent one value. At this time, the mapping result for each signal is shown in [Table 2].

을 의미한다.As shown in Table 2, what it means depends on which signal each bit represents. For example, the bit string represented by "00110111" in the PRS signal region actually means 0, -1, 1, -1, and the bit string represented by "00110100" in the FIC and MSC signal regions is actually

Means.

In addition, in order to convert a frame signal of the terrestrial DMB into a TDM signal, it is necessary to determine whether to transmit all signals constituting the frame of the terrestrial DMB, that is, all of NULL (TII), PRS, FIC, and MSC signals or only some signals. do. Since the FIC and MSC signals contain data for service, they must be transmitted. However, the NULL (TII) signal and the PRS signal may be generated by the gap filler 130 and may or may not be transmitted through the TDM link. [Table 3] shows the number of bytes to be transmitted per frame depending on whether NULL (TII) signal and PRS signal are transmitted.

Subsequently, a configuration of the TDM frame generator 115 for rearranging the OFDM symbols generated from the symbol generator 113 to generate a TDM frame will be described below.

"의 심볼로 구성된 출력)을 받아들여 1 비트의 데이터 형식으로 매핑한다. 제 1 내지 제 3 비트 맵퍼(1151-1153)에서 수행되는 데이터의 매핑은, 앞에서 설명한 [표 2]의 형식을 따라 수행된다. As shown in FIG. 4, the TDM frame generator 115 includes first to third bit mappers 1151-1153, a byte multiplexer 1155, an additional information generator 1157, and a unit data generator 1158. , And a synchronization information inserter 1159. The first bit mapper 1151 has a complex output Z _{0, k} from null multiplexer 1139 (output _where I and Q are composed of symbols of "0" or "0, 1, -1", respectively; Phase (real), Q stands for quad-phase (imaginary), and maps to a 2-bit data format. The second bit mapper 1152 receives the complex output Z _{1, k} (the output of I, Q composed of symbols of "0, 1, -1") from the phase reference symbol generator 1135, and receives a two-bit Map to a data type. The third bit mapper 1153 has complex outputs y _{l, k} , l ≥ 2 from the FIC and MSC symbol generator 1137 _where I and Q are each "

And an output of 1-bit data format. The data mapping performed by the first to third bit mappers 1151-1153 is performed according to the format of Table 2 described above. do.

로 명명한다.

는

의 실수부를 나타내고,

는

의 허수부를 각각 나타낸다. 그리고 바이트 멀티플렉서(1155)의 단위 출력을

로 명명한다.

인 경우 r은 0, 1, …, 767의 값을 가지며,

인 경우 r은 0, 1, …, 383의 값을 가진다. 바이트 멀티플렉서(1155)는, 제 1 내지 제 3 비트 맵퍼(1151-1153)에서 매핑된 데이터를 1 바이트 단위로 다중화한다. 바이트 멀티플렉서(1155)의 단위 출력의 형태는 다음과 같다.Here, the complex output of the bit mappers 1115-1153 is

Named as

Is

Represents the real part of

Is

Represents the imaginary part of. The unit output of the byte multiplexer 1155

Named as

R is 0, 1,... , Has a value of 767,

R is 0, 1,... , Has a value of 383. The byte multiplexer 1155 multiplexes the data mapped by the first to third bit mappers 1151-1153 in units of 1 byte. The unit output of the byte multiplexer 1155 is as follows.

로 표현한 도면이다. 도 6을 참조하여 바이트 멀티플렉서(1155)에서 바이트 단위로 다중화하는 규칙은 다음과 같다.FIG. 6 shows the unit output of the byte multiplexer 1155 shown in FIG.

This is expressed as. Referring to FIG. 6, the rule of multiplexing by byte unit in the byte multiplexer 1155 is as follows.

=1, 2, 3, …, 767, 768, -768, -767, …, -2, -1의 순서를 따른다. 두 번째, 앞에 기재된 다중화의 순서대로

,

데이터를 바이트의 7^th Bit(MSB) 부터 채워나간다. 세 번째, l=0,1인 경우에는 2 비트의

,

각 데이터를 MSB 비트, LSB 비트 순서대로 바이트를 채워나간다. 즉, 상기 바이트 멀티플렉서(1155)는, 제 1 비트 맵퍼(1151) 및 제 2 비트 맵퍼(1152)의 맵핑 결과에 대해서는(즉, l=0,1인 경우) 다중화되는 바이트의 MSB 비트부터 순서대로 2비트씩 데이터를 채워나간다. 그리고, 상기 바이트 멀티플렉서(1155)는, 제 3 비트 맵퍼(1153)의 맵핑 결과에 대해서는(즉, l≥2인 경우) 다중화되는 바이트의 MSB 비트부터 순서대로 1비트씩 데이터를 채워나간다.First, in terms of sub-carrier index, the order of multiplexing by byte is

= 1, 2, 3,... , 767, 768, -768, -767,... Followed by -2, -1 Second, in the order of multiplexing described earlier

,

Fill data from the 7 ^th bit (MSB) of the byte. Third, if l = 0, 1, 2 bits

,

Each data is filled with byte in order of MSB bit, LSB bit. That is, the byte multiplexer 1155 sequentially processes the mapping result of the first bit mapper 1151 and the second bit mapper 1152 (that is, when l = 0, 1) from the MSB bit of the byte to be multiplexed. Fill the data by 2 bits. The byte multiplexer 1155 fills data one bit at a time from the MSB bit of the multiplexed byte to the mapping result of the third bit mapper 1153 (that is, when l ? 2).

,

을 바이트 단위로 다중화한

의 각 비트를 표로 나타내면, 각각 [표 4]와 [표 5]와 같다. for l = 0, 1 and l ≥ 2

,

Multiplexed in bytes

When each bit of is shown in a table | surface, it is as [Table 4] and [Table 5], respectively.

Data multiplexed in byte units by the byte multiplexer 1155 is input to the unit data generator 1158.

On the other hand, the TDM side information generator 1157 generates a plurality of TDM side information required for converting the terrestrial DMB signal into a TDM signal. At this time, the additional information generated from the TDM additional information generator 1157 includes a sync word (SYNC_WORD), an ensemble signal (ENS), a FILL byte, and a FILL block information.

)를 삽입하여, 188 바이트의 TDM 데이터를 출력한다. 동기정보 삽입기(1159)로부터 발생된 188 바이트의 TDM 데이터는 TDM 전송부(117)를 통해 위성(120)으로 송출된다. The unit data generator 1158 may include data multiplexed by the byte multiplexer 1155 in units of 1 byte and a plurality of TDM side information generators (eg, SYNC_WORD, ENS (C, N), FILL byte, and FILL block) generate TDM unit data in units of 187 bytes by multiples of 8. In addition, the synchronization information inserter 1159 stores 187 bytes of unit data generated from the unit data generator 1158 and includes one sync byte SYNC,

) To output 188 bytes of TDM data. 188 bytes of TDM data generated from the synchronization information inserter 1159 are transmitted to the satellite 120 through the TDM transmitter 117.

)를 삽입하여 188 바이트 단위로 만든다. 그리고 에너지 확산을 위하여 PRBS(Pseudo-Random Binary Sequence)를 이용한 스크램블링(Scarmbling)을 수행하고, 리드 솔로몬(Reed-Solomon) 부호화를 수행하여 204 바이트 단위로 프레임을 구성한다. 그리고 나서, 이에 대해 길쌈 인터리빙(convolutional interleaving ; CI)과 길쌈 부호화(Convolutional Coding ; CC) 과정을 수행하여 QPSK(Quadrature Phase Shift Keying) 변조를 수행하고, α = 0.35 짜리 RRC(Root Raised Cosine) 필터링을 수행하여 송신한다. Looking at the currently used satellite DMB standard, ETS 300 421, we make the input data in 187 bytes, which contains 1 byte of sync byte (SYNC) and 1 byte of inverted sync byte (

) Into 188 bytes. Scrambling using PBS (Pseudo-Random Binary Sequence) is performed for energy diffusion, and Reed-Solomon coding is performed to configure a frame in units of 204 bytes. Then, quadrature phase shift keying (QPSK) modulation is performed by performing convolutional interleaving (CI) and convolutional coding (CC) processes, and R = 0 (Root Raised Cosine) filtering with α = 0.35 is performed. Perform and send.

 Accordingly, the unit data generator 1158 according to the present invention generates data to be transmitted in units of 187 bytes so that the terrestrial DMB signal can be transmitted in the TDM frame format defined in the ETS 300 421 standard. In the present invention, not only FIC and MSC defined in the ETS 300 421 standard but also NULL (or TII) symbol and PRS (phase reference symbol) are configured as TDM signals and transmitted together. To this end, the present invention proposes a generation standard for TDM frames conforming to ETS 300 421, which is a standard for OFDM signals. At this time, if N_BYTE is defined as the number of bytes to be transmitted to TDM, N_BYTE becomes 30336 bytes as shown in [Table 3].

FIG. 7 is a flowchart illustrating a method of generating a TDM frame according to an exemplary embodiment of the present invention, which is performed by the TDM frame generator 115 shown in FIG. 4, and FIG. 8 is a process of generating the TDM frame shown in FIG. 7. Is a diagram illustrating a structure of a TDM frame according to the embodiment. Referring to FIGS. 7 and 8, a method of generating a TDM frame according to the present invention is as follows.

The operation of converting the terrestrial DMB data into a TDM frame is substantially performed by the TDM frame generation unit 115 shown in FIG. 4. In order to convert the terrestrial DMB data into a TDM frame, the TDM frame generator 115 first allocates a plurality of unit data to the TDM frame so as to coincide with a start point of each DMB frame (step 2100). At this time, the size of each unit data allocated is 187 bytes. As will be described in detail below, each unit data corresponds to each DMB frame to be included in a TDM frame. If there is empty space in the allocated unit data, fill the fill space with fill byte. Fill byte means byte data whose value of all data bits is one.

Next, the number of unit data constituting one TDM frame is determined (step 2300). In the present invention, the number of unit data constituting one TDM frame is determined to be a multiple of eight. In this case, when the number of unit data to be included in the TDM frame is not a multiple of 8, a fill block is filled in the empty space of the TDM frame so that the number of unit data may be 8. The fill block means a data block in which all data bits have a value of one.

After unit data constituting the TDM frame is allocated in steps 2100 and 2300, respective terrestrial DMB signals are inserted into each unit data area (step 2500). Then, 12 bytes of sync word SYNC_WORD and 1 byte of ensemble data (ENS (C, N)) are inserted at positions where the respective DMB signals start in each unit data (step 2700).

)가 삽입된다(2900 단계). 그결과, 최종적으로 구성된 각각의 단위 데이터의 크기는 동기 바이트를 포함하여 총 188 바이트가 된다. 이 때, 2900 단계에서는 TDM 프레임의 첫 번째 187 바이트의 단위 데이터에 반전된 동기 바이트(

)(즉, B8 Hex)가 삽입된다. 그리고, 매 8번째의 187 바이트의 단위 데이터마다(즉, 8의 배수 번째 프레임마다) 반전된 동기 바이트(

)가 삽입되어, 187 바이트로 구성된 각각의 단위 데이터가 188 바이트가 된다. 그리고, 나머지 단위 데이터들에는 반전되지 않은 동기 바이트(SYNC)(즉, 47 Hex)가 삽입되어, 187 바이트로 구성된 각각의 단위 데이터가 188 바이트가 된다. After each of the unit data constituting the TDM frame is configured in steps 2500 and 2700, a sync byte (SYNC or

) Is inserted (step 2900). As a result, the size of each unit data finally formed is 188 bytes in total including the sync byte. At this time, in step 2900, the sync byte (inverted to the unit data of the first 187 bytes of the TDM frame)

) (Ie, B8 Hex) is inserted. And the inverted sync byte every 8th 187 byte unit data (i.e., every multiple of 8th frame)

) Is inserted so that each unit data composed of 187 bytes becomes 188 bytes. The inverted sync byte SYNC (ie, 47 Hex) is inserted into the remaining unit data, so that each unit data composed of 187 bytes becomes 188 bytes.

Referring to FIG. 7 and FIG. 8, the principle of converting a terrestrial DMB signal into a TDM frame is as follows.

The first is to divide the TDM frame into DMB frame units (96msec for terrestrial DMB). For this purpose, the starting point of the 187 byte unit of the TDM frame coincides with the starting point of the DMB frame. The last 187 bytes of unit data are filled with FILL bytes (All 1 bits: FF in HEX). The FILL byte represents data with all bits having a value of one.

Second, the total number of unit data of 187 bytes in one frame of DMB data is a multiple of eight. If the total number of unit data of 187 bytes in one frame of the DMB is not a multiple of 8, a FILL block of 187 bytes is inserted to be a multiple of 8. Such an insert operation of the FILL block is performed by the unit data generator 1158 together with the insert operation of the FILL byte. In addition, the data of the inserted FILL block is filled with FILL bytes (ie All 1 bits: FF in HEX). This principle ensures that when multiple DMB ensembles are multiplexed with TDM, the start of each DMB frame always starts with an Inverted SYNC Byte (= B8 Hex).

In order to satisfy the first principle, a parameter regarding how many unit data of 187 bytes in one frame must be determined. If this value is defined as N_DATA_FRAME, it can be obtained as shown in [Equation 1] below.

N_DATA_FRAME = INT (((N_BYTE +13) -1) / 187) + 1

= INT (((30336 + 13) -1) / 187) + 1

= 163 pieces

Here, INT (A) is a maximum integer not exceeding A, and N_BYTE means the number of bytes of terrestrial DMB data to be transmitted (ie, 30336 bytes). In Equation 1, 1 is added to configure the remaining bytes in one unit of 187 bytes. To construct a TDM frame, a total of 13 bytes are required for SYNC_WORD (12 bytes) and ENS (C, N) (1 byte) as shown in FIG. 8 (see the third and fourth principles below). Therefore, in Equation 1, the number of bytes of terrestrial DMB data to be transmitted (that is, 30336 bytes) is added to 13 to determine a parameter for how many 187 bytes of unit data are included in one frame.

Subsequently, if the FILL byte number is defined as N_FILL_BYTE, the FILL byte number is calculated as shown in [Equation 2].

N_FILL_BYTE = N_DATA_FRAME * 187-N_BYTE-13

= 163 * 187-30336-13

= 132 Byte

Here, 13 corresponds to the number of bytes used for SYNC_WORD and ENS (C, N).

Applying the second principle to the N_DATA_FRAME value obtained in compliance with the first principle, the number of 187 byte units in one frame of terrestrial DMB is obtained as follows. If this value is defined as N_WORD_FRAME, N_WORD_FRAME is a multiple of 8 and is given by Equation 3.

N_WORD_FRAME = (INT (N_DATA_FRAME / 8) + 1) * 8

= (Int (163/8) + 1) * 8

= 168 pieces

If the number of FILL blocks is defined as N_FILL_BLOCK, N_FILL_BLOCK is shown in [Equation 4].

N_FILL_ BLOCK = N_WORD_FRAME-N_DATA_FRAME

= 168-163

= 5 pcs

According to the first and second principles described above, when one terrestrial DMB frame is transmitted through a TDM path, the number of unit data of 187 bytes to be transmitted, N_WORD_FRAME, becomes 168 according to [Equation 3]. At this time, if the code rate (r) of the convolutional code of the TDM path is 1/2, the QPSK Symbol Rate of the TDM path can be obtained as shown in Equation 5 below.

QPSK Symbol Rate = 204 * N_WORD_FRAME * 8 / 96ms

= 204 * 168 * 8 / 96ms

= 2.856 Msps

In the case of transmitting N terrestrial DMB ensembles over a TDM path, if the code rate (r) of the convolutional code of the TDM path is 1/2, the QPSK symbol rate is expressed by Equation 6 as shown in Equation 6 below. Become.

QPSK Symbol Rate = 2.856 * N Msps

For example, in case of transmitting six terrestrial DMB ensembles to TDM, the QPSK symbol rate of the TDM path is 17.136 Msps according to Equation 6. Here, Msps stands for Mega-Sample per Second.

Subsequently, a third principle of signal conversion for converting a terrestrial DMB signal into a TDM frame is to insert a 12-byte sync word SYNC_WORD at the beginning of the terrestrial DMB frame. The sync word SYNC_WORD is a constant value inserted to indicate the start point of the terrestrial DMB frame. In the present invention, 12 bytes of 1F90CAE06F35073AB6F8C549 (HEX) are used. For reference, the sync word SYNC_WORD may be smaller or larger than 12 bytes, and may be defined as another value.

The fourth principle of signal conversion for converting a terrestrial DMB signal into a TDM frame is to insert an ensemble signal ENS (C, N) represented by one byte after a synchronization word (SYNC_WORD) of 12 bytes. The ensemble signal ENS (C, N) indicates how many terrestrial DMB ensemble signals and the current data come from the terrestrial DMB ensemble when a plurality of terrestrial DMB ensemble signals are composed of TDM signals. That is, in ENS (C, N), C means a method for combining ensemble, and N means terrestrial DMB ensemble number.

In the ensemble combination method according to the present invention, the case where C has a value of 1 and N has a value for distinguishing terrestrial DMB carriers (N = 1, 2, ..., 6) is considered, and this "ensemble It is called as "combination method 1". The bit representation of the ensemble signal ENS (C, N) according to the ensemble combination method 1 is shown in [Table 6].

Referring to [Table 6], in the bit representation of the ensemble signal ENS (C, N), the first four bits mean an ensemble combination method, and “0000” means an ensemble combination method 1. The next four bits of "0000" mean the ensemble of the terrestrial DMB signal (that is, the terrestrial DMB ensemble number).

9 is a diagram illustrating a configuration example of a TDM frame according to the present invention when there are six terrestrial DMB ensemble.

)이며, 동기 워드(SYNC_WORD)가 뒤따른다. 도 9에서, FILL Byte & FILL Block으로 표기된 부분은 도 8에 도시된 FILL 바이트 부분과, FILL 블록 부분을 함께 표시한 부분이다. 도 9에 도시된 FILL Byte & FILL Block 영역의 크기는 [수학식 7]과 같다.8 and 9, the first byte of each terrestrial DMB frame is an inverted sync byte (

Is followed by a synchronization word (SYNC_WORD). In FIG. 9, a portion denoted by FILL Byte & FILL Block is a portion in which the FILL byte portion and the FILL block portion illustrated in FIG. 8 are displayed together. The size of the FILL Byte & FILL Block area shown in FIG. 9 is shown in [Equation 7].

 N_FILL_BYTE + 187 * N_FILL_BLOCK

= 132 + 187 * 5

 = 1067 Byte

Here, the value of the FILL byte and all bytes constituting the FILL block is FF (Hex).

As described above, in the ground station 110 of the satellite-based terrestrial DMB system 200 according to the present invention, the satellite 120 converts the terrestrial DMB signal into a TDM signal according to the first to fourth data conversion rules described above. To send. The satellite 120 transmits a TDM signal to the gap filler 130, and the gap filler 130 reconverts the TDM signal received from the satellite 120 into a terrestrial DMB signal. Then, the gap filler 130 modulates the converted terrestrial DMB signal into an OFDM signal to provide the terrestrial DMB signal to an area 30 where the receiver cannot receive the OFDM signal from the terrestrial transmitting station 10. To this end, the gap filler 130 must be provided with a configuration for converting a TDM signal into a terrestrial DMB signal, and a configuration for modulating and transmitting the converted terrestrial DMB signal into an OFDM signal.

FIG. 10 is a block diagram illustrating a configuration of a gap filler 130 according to an exemplary embodiment of the present invention shown in FIG. 2, and illustrates a process of converting a TDM signal into a terrestrial DMB signal. Referring to FIG. 10, the gap filler 130 according to the present invention includes a TDM signal receiver 131, a terrestrial DMB frame generator 135, and a plurality of OFDM transmitters 137-1 to 137 -N.

The TDM signal receiver 131 receives a TDM signal from the satellite 120. The terrestrial DMB frame generation unit 135 converts a TDM signal received through the TDM signal receiver 131 into a terrestrial DMB signal. In addition, a plurality of OFDM signal generators 138-1 to 138-N are provided in the plurality of OFDM transmitters 137-1 to 137-N, and the terrestrial DMB generated from the terrestrial DMB frame generator 135 is provided. Modulate the signal into an OFDM signal. And modulated OFDM signals (OFDM signal 1 to OFDM signal N) of the 200MHz band is transmitted. Each of the OFDM transmitters 137-1 through 137 -N may restore a plurality of OFDM ensembles (OFDM signals 1 through OFDM signal N) by using the sync word SW and the ensemble signals included in the TDM signal. . The conversion process of the TDM signal performed by the gap filler 130 into the terrestrial DMB signal is as follows.

The terrestrial DMB frame generator 135 includes a sync word (SW) detector 1351, an ensemble detector 1352, a frame boundary signal (FBS) generator 1353, an additional information remover 1355, and a plurality of demultiplexers. 1357-1 through 1357-N, and a plurality of bit demappers 1359-1 through 1359-N.

The sync word SW detector 1351 detects a sync word SW from an input TDM transmission frame. The ensemble detector 1352 detects an ensemble signal ENS from an input TDM transmission frame. As can be seen in Figures 5 to 8, in the TDM signal constructed according to the present invention, the sync word SW is repeated at a predetermined position for each width T _F of each transmission frame. The overall synchronization state between the TDM transmission frame and the OFDM transmission frame included therein is a process in which the ensemble value after the synchronization word SW changes (ENS (1,1)-> ENS (1,2)-> .. This can be maintained by continuously observing .ENS (1, N)-> ENS (1,1)). The FBS generator 1353 generates the frame boundary signal FBS in response to the detected sync word SW and the ensemble signal ENS. The additional information remover 1355 removes the sync word SW, the ensemble signal ENS, and the FILL byte (or FILL block) included in the received TDM signal. The information removed by the additional information remover 1355 is additional information inserted when the terrestrial DMB signal is converted into a TDM signal, and is removed when the received TDM signal is reconstructed into the terrestrial DMB signal.

The demultiplexers 1357-1 to 1357 -N remove the side information (eg, the sync word SW and the ensemble signal ENS, and the FILL byte (or FILL block)) from the side information remover 1355. The received TDM signal, and receives the frame boundary signal FBS from the FBS generator 1353. Demultiplexers (1357-1 to 1357-N), whether the input of the current demultiplexers (1357-1 to 1357-N) is NULL (or TII) interval, PRS interval using the frame boundary signal (FBS), It finds out whether it is the FIC & MSC section and transfers the input signal to the corresponding bit demappers 1359-1 to 1359-N together with the frame information.

)으로 각각 변환한다. The bit demappers 1359-1 to 1359 -N receive a signal input from the corresponding demultiplexers 1357-1 to 1357 -N and a frame boundary signal FBS generated from the FBS generator 1353. . The bit demappers 1359-1 to 1359 -N map the received data as opposed to the mapping operation performed by the bitmappers 1151-1153 shown in FIG. 4. For example, the bit demappers 1359-1 through 1359 -N may use two bits (eg, 11, 00, 01) as one when the received signal corresponds to a NULL (or TII) or PRS interval. Value is converted into a value (e.g., -1, 0, 1), and if a received signal falls within the FIC and MSC intervals, one bit (e.g., 0, 1) is converted into one value (e.g.,

To each).

 At this time, the terrestrial DMB signal reconstructed by the terrestrial DMB frame generator 135 corresponds to a signal immediately before being modulated into an OFDM signal. Therefore, the recovered terrestrial DMB signal is transmitted after being modulated into an OFDM signal through the OFDM signal generators 138-1 to 138-N.

 As described above, the terrestrial DMB system according to the present invention uses a satellite link that uses transmit and receive signals of different frequency bands, instead of the conventional RF repeater or an optical link repeater that uses transmit and receive signals of the same frequency band. Satellite-based repeater is used as a gap filler for terrestrial DMB. Therefore, oscillation of the signal generated by the gap filler is prevented at the source, thereby increasing the degree of freedom for the installation and reception antenna of the gap filler, it is possible to reduce the size and cost of the gap filler facility. In the terrestrial DMB system according to the present invention, since additional information such as transmitter identification information (TII) is transmitted and received through a gap filler, the receiver can accurately provide information on which path the terrestrial DMB service is provided. Therefore, the billing problem for terrestrial DMB service can be solved.

In the above, the terrestrial DMB broadcasting system according to the present invention has been described with reference to the above drawings, but this is merely exemplary and various applications and modifications can be made without departing from the spirit of the present invention. The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

According to the terrestrial DMB system according to the present invention as described above, instead of a conventional RF repeater or an optical link repeater using the same frequency band transmission and reception, using a satellite link using a transmission and reception signal of different frequency bands Satellite-based repeaters can be used as a gap filler for terrestrial DMB. Therefore, the oscillation of the signal generated by the gap filler can be prevented at the source, thereby increasing the degree of freedom for the installation and reception antenna of the gap filler, the size and cost of the gap filler facility is reduced. In the terrestrial DMB system according to the present invention, since additional information such as transmitter identification information (TII) is transmitted and received through a gap filler, the receiver can accurately provide information on which path the terrestrial DMB service is provided. Therefore, the billing problem for terrestrial DMB service can be solved.

Claims (51)

A terrestrial data path for transmitting a terrestrial DMB signal of a first type to a plurality of receivers via a terrestrial transmitting station; And Transmitting a terrestrial DMB signal of a second type to a gap filler, converting the terrestrial DMB signal of the second type received by the gap filler into the terrestrial DMB signal of the first type, and transmitting the signal to the plurality of receivers; A terrestrial DMB system comprising a satellite data path for generating transmitter identification information (TII) to identify which gap filler has been provided terrestrial DMB service. The method of claim 1, The terrestrial DMB signal of the first type is an Orthogonal Frequency Division Multiplexing (OFDM) signal. The terrestrial DMB system of the second type is a time division multiplexer (TDM) signal having a higher frequency band than the terrestrial DMB signal of the first type. The method of claim 1, The satellite data path includes a ground station that converts the terrestrial DMB signal of the first type into a terrestrial DMB signal of the second type and transmits it to the gap filler through a satellite. And wherein the ground station generates the terrestrial DMB signal of the second type by using a terrestrial DMB signal of the third type immediately before being modulated to the terrestrial DMB signal of the first type. 4. The ground station of claim 3, wherein the ground station is A signal receiver for receiving the terrestrial DMB signal of the third type from the terrestrial transmitting station or broadcasting station; A symbol generator which generates a plurality of symbols required to construct the first type terrestrial DMB signal using the third type terrestrial DMB signal; A frame generator configured to generate the terrestrial DMB signal of the second type in response to the symbols; And And a transmission unit for transmitting the second type terrestrial DMB signal to the satellite. The method of claim 4, wherein And the symbol generator generates transmitter identification information (TII) for identifying through which gap filler the terrestrial DMB service is provided. The method of claim 5, The symbol generator generates a null symbol, a phase reference symbol (PRS), a fast information channel (FIC) symbol, and an MSC symbol (main service channel). The method of claim 6, wherein the symbol generator is A first symbol generator for generating said transmitter identification information (TII); A second symbol generator generating the null symbol; A third symbol generator for generating the phase reference symbol (PRS); A fourth symbol generator generating the fast information channel (FIC) symbol and the main service channel (MSC) symbol; And  And a null multiplexer connected to the first symbol generator and the second symbol generator to select and output any one of the transmitter identification information (TII) and the null symbol (NULL). The apparatus of claim 6, wherein the frame generator A first bit mapper for mapping the transmitter identification information (TII) to a first mapping scheme;  A second bit mapper for mapping the phase reference symbol PRS to the first mapping scheme; A third bit mapper for mapping the fast information channel (FIC) and main service channel (MSC) in a second mapping scheme; A byte multiplexer which multiplexes the mapping result of the first to third bit mappers; A side information generator for generating a plurality of side informations necessary for constructing the second type terrestrial DMB signal; A unit data generator for generating a plurality of unit data having a predetermined number of bits by combining the multiplexing result and the additional information; And And a synchronization information inserter for inserting synchronization information between the respective unit data. The method of claim 8, The additional information generator generates a synchronization word (SYNC_WORD), an ensemble signal (ENS), a FILL byte, and a FILL block information necessary for constructing the second type terrestrial DMB signal. . The method of claim 8, The unit data is terrestrial DMB system, characterized in that consisting of 187 bytes. The method of claim 9, And the frame generation unit matches a start point of the unit data with a start point of the first type terrestrial DMB signal. The method of claim 11, And the frame generation unit fills the empty space generated by matching the start point of the unit data with the start point of the terrestrial DMB signal of the first type with the FILL byte. The method of claim 8, And the unit data is generated by multiples of eight. The method of claim 8, And when the number of the unit data is not a multiple of eight, adding the FILL block to the end of the unit data so that the number of the unit data is a multiple of eight. The method of claim 8, And the synchronization information inserter inserts the first unit data and inverted synchronization information for every eighth unit data after the first unit data. The method of claim 8, The byte multiplexer has a subcarrier index of the terrestrial DMB signal of the third type.

when,

= 1, 2, 3,... , 767, 768, -768, -767,... And -2, -1 terrestrial DMMB system, characterized in that for performing multiplexing in units of bytes in order. The method of claim 16, The byte multiplexer, when the multiplexing of the byte unit, the terrestrial wave, characterized in that the data is filled by 2 bits in order from the MSB bit of the multiplexed byte for the mapping result of the first bit mapper and the second bit mapper DMB system. The method of claim 16, And the byte multiplexer fills data one bit at a time from the MSB bit of the multiplexed byte with respect to the mapping result of the third bit mapper during the multiplexing of the byte unit. The method of claim 9, wherein the gap filler A signal receiver for receiving the terrestrial DMB signal of the second type from the satellite; A frame generator configured to analyze the terrestrial DMB signal of the second type and generate the terrestrial DMB signal of the third type; And And a transmitter configured to convert the terrestrial DMB signal of the third type into the terrestrial DMB signal of the first type and transmit the converted terrestrial DMB signal to the plurality of receivers. 20. The apparatus of claim 19, wherein the frame generator An information detector for detecting the sync word SYNC_WORD and the ensemble signal ENS from the terrestrial DMB signal of the second type; A frame boundary signal generator for extracting a frame boundary of the third type terrestrial DMB signal based on the sync word SYNC_WORD and the ensemble signal ENS; A side information remover for removing the side information added to the terrestrial DMB signal of the second type; A plurality of demultiplexers for demultiplexing the output of the side information remover in response to the frame boundary signal; And Terrestrial DMBs comprising a plurality of bit demappers for generating a plurality of terrestrial DMB signals of the third type by mapping the outputs of the demultiplexers to the mapping scheme of the first to third bit mappers system. The method of claim 20, And the transmitter comprises a signal generator for modulating the plurality of terrestrial DMB signals of the third type into a plurality of terrestrial DMB signals of the first type. (a) transmitting a terrestrial DMB signal of a first type to a plurality of receivers via a terrestrial transmitting station, and simultaneously transmitting a terrestrial DMB signal of a second type to a gap filler via satellite; And (b) converting the terrestrial DMB signal of the second type received by the gap filler into the terrestrial DMB signal of the first type and transmitting it to a plurality of receivers, and through which gap filler the terrestrial DMB service is provided; And generating transmitter identification information (TII) capable of identifying the TDM system. The method of claim 22, The terrestrial DMB signal of the first type is an Orthogonal Frequency Division Multiplexing (OFDM) signal. And the second type terrestrial DMB signal is a time division multiplexer (TDM) signal having a higher frequency band than the terrestrial DMB signal of the first type. The method of claim 22, In the step (b), the terrestrial DMB system of claim 2, wherein the terrestrial DMB signal of the second type is generated using a terrestrial DMB signal of a third type immediately before being modulated into the terrestrial DMB signal of the first type. Way.  The method of claim 24, wherein step (b)  (b-1) receiving the terrestrial DMB signal of the third type from the terrestrial transmitting station or broadcasting station;  (b-2) generating a plurality of symbols required to construct the first type terrestrial DMB signal using the third type terrestrial DMB signal;  (b-3) generating the second type terrestrial DMB signal in response to the symbols; And  and (b-4) transmitting the terrestrial DMB signal of the second type to the satellite. The method of claim 25, In step (b-2), the transmitter identification information (TII) is generated to identify which gap filler the terrestrial DMB service is provided through. The method of claim 26, In the step (b-2), a terrestrial wave characterized in that a null symbol, a phase reference symbol (PRS), a fast information channel (FIC) symbol, and a main service channel (MSC) symbol are generated. How to configure DMB system. The method of claim 27, wherein step (b-2) (b-2-1) generating the transmitter identification information (TII); (b-2-2) generating the null symbol; (b-2-3) generating the phase reference symbol (PRS); (b-2-4) generating the fast information channel (FIC) and main service channel (MSC); And and (b-2-5) selecting and outputting any one of the transmitter identification information (TII) and the null symbol (NULL). The method of claim 27, wherein step (b-3) (b-3-1) mapping the transmitter identification information (TII) to a first mapping scheme; (b-3-2) mapping the phase reference symbol (PRS) to the first mapping scheme; (b-3-3) mapping the fast information channel (FIC) and the main service channel (MSC) to a second mapping scheme; (b-3-4) multiplexing the mapping result performed in steps (b-3-1) to (b-3-3); (b-3-5) generating a plurality of additional information required for constructing the second type terrestrial DMB signal; (b-3-6) generating a plurality of unit data having a predetermined number of bits by combining the multiplexing result and the additional information; And and (b-3-7) inserting synchronization information into the plurality of pieces of unit data. The method of claim 29, In the step (b-3-5), a sync word (SYNC_WORD), an ensemble signal (ENS), FILL byte information, and FILL block information necessary for constructing the second type terrestrial DMB signal are generated. A method of configuring a terrestrial DMB system characterized by the above-mentioned. The method of claim 29, And wherein the unit data consists of 187 bytes. The method of claim 30, In step (b-3), the start point of the unit data and the start point of the terrestrial DMB signal of the first type coincide with each other. The method of claim 32, In the step (b-3), the FILL byte is filled in the empty space generated by matching the start point of the unit data with the start point of the terrestrial DMB signal of the first type. The method of claim 29, And the unit data is generated as many as eight multiples of the terrestrial DMB system. The method of claim 29, And if the number of unit data is not a multiple of eight, adding the FILL block to an end of the unit data so that the number of unit data is a multiple of eight. The method of claim 29, In the step (b-3-7), And inverted synchronization information for every eighth unit data after the first unit data and the eighth unit data after the first unit data. The method of claim 29, In the step (b-3-4), the subcarrier index of the terrestrial DMB signal of the third type is

when,

= 1, 2, 3,... , 767, 768, -768, -767,... Method of configuring a terrestrial DMMB system characterized in that the multiplexing unit of byte is performed in the order of -2, -1. The method of claim 37, In the step (b-3-4), the MSB bit of the byte to be multiplexed with respect to the mapping result in the steps (b-3-1) and (b-3-2) when the byte unit is multiplexed. Method of configuring a terrestrial DMB system characterized in that the data is filled by 2 bits in order from. The method of claim 37, In the step (b-3-4), when the multiplexing of the byte unit, the data of the mapping in the step (b-3-3) is filled with data one by one starting from the MSB bit of the multiplexed byte. Method for configuring a terrestrial DMB system, characterized in that. The method of claim 30, wherein step (b) (b-5) receiving the terrestrial DMB signal of the second type from the satellite; (b-6) generating the terrestrial DMB signal of the third type by analyzing the terrestrial DMB signal of the second type; And (b-7) converting the terrestrial DMB signal of the third type into a terrestrial DMB signal of the first type and transmitting the converted terrestrial DMB signal to the plurality of receivers. The method of claim 40, wherein step (b-6) (b-6-1) detecting the sync word SYNC_WORD and the ensemble signal ENS from the terrestrial DMB signal of the second type; (b-6-2) extracting a frame boundary of the terrestrial DMB signal of the third type based on the sync word SYNC_WORD and the ensemble signal ENS; (b-6-3) removing the additional information added to the terrestrial DMB signal of the second type; (b-6-4) demultiplexing the output of the side information remover in response to the extracted frame boundary; And (b-6-5) mapping the demultiplexed result to the mapping method performed in the steps (b-3-1) to (b-3-3), in contrast to the plurality of terrestrial waves of the third type; And generating DMB signals. 42. The method of claim 41 wherein And in the step (b-7), the terrestrial DMB signals of the third type are modulated into a plurality of terrestrial DMB signals of the first type. (a) allocating a plurality of unit data to one time division multiplex (TDM) frame to coincide with the starting point of each terrestrial DMB frame; (b) determining the number of unit data constituting the time division multiplex frame; (c) inserting the respective terrestrial DMB signals into the respective unit data regions; (d) inserting a sync word (SYNC_WORD) and ensemble data (ENS (C, N)) into positions where the respective terrestrial DMB signals start in the unit data; and (e) inserting synchronization information between each unit data, And if a blank space exists in the unit data, a FILL byte is inserted into the free space. The method of claim 43, The FILL byte is a frame configuration method for a terrestrial DMB system in which all bits have a value of 1. The method of claim 43, And the number of unit data constituting the time division multiplex frame is a multiple of eight. The method of claim 45, And when the number of unit data is not a multiple of eight, adding the FILL block to an end of the unit data so that the number of unit data is a multiple of eight. The method of claim 43, And the inverted synchronization information is inserted into the first unit data and every eighth unit data after the first unit data. 44. The method of claim 43, wherein step (c) (c-1) generating transmitter identification information (TII) or null symbols, a phase reference symbol (PRS), a fast information channel (FIC) symbol, and a main service channel (MSC) symbol; (c-2) mapping the transmitter identification information (TII) and the phase reference symbol (PRS) to a first mapping scheme, respectively; (c-3) mapping the fast information channel (FIC) symbols and the main service channel (MSC) symbols in a second mapping scheme, respectively; And and (c-4) multiplexing the mapping results and storing the mapping results in the reference data area. 49. The method of claim 48 wherein In the step (c-4), the subcarrier index of the terrestrial DMB signal is

when,

= 1, 2, 3,... , 767, 768, -768, -767,... And -2, -1 frame configuration method for terrestrial DMB system, characterized in that the multiplexing unit is performed in the order of -1. The method of claim 49, In the step (c-4), the mapping result performed in the step (c-2) for the terrestrial DMB system, characterized in that to fill the data by 2 bits in order from the MSB bit of the multiplexed byte How frames are organized. The method of claim 49, In the step (c-4), the mapping result performed in the step (c-3) for the terrestrial DMB system, characterized in that to fill the data by 1 bit in order from the MSB bit of the multiplexed byte How frames are organized.

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