WO2008100046A1 - Digital broadcasting transmission/reception apparatus and methods thereof - Google Patents

Digital broadcasting transmission/reception apparatus and methods thereof Download PDF

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Publication number
WO2008100046A1
WO2008100046A1 PCT/KR2008/000782 KR2008000782W WO2008100046A1 WO 2008100046 A1 WO2008100046 A1 WO 2008100046A1 KR 2008000782 W KR2008000782 W KR 2008000782W WO 2008100046 A1 WO2008100046 A1 WO 2008100046A1
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WO
WIPO (PCT)
Prior art keywords
signal
broadcast signal
bandwidth
channel
control signal
Prior art date
Application number
PCT/KR2008/000782
Other languages
French (fr)
Inventor
Ji-Sung Oh
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2008100046A1 publication Critical patent/WO2008100046A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/04—Supports for telephone transmitters or receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
    • H04N21/2402—Monitoring of the downstream path of the transmission network, e.g. bandwidth available
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
    • H04N21/64738—Monitoring network characteristics, e.g. bandwidth, congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64746—Control signals issued by the network directed to the server or the client
    • H04N21/64761—Control signals issued by the network directed to the server or the client directed to the server
    • H04N21/64769—Control signals issued by the network directed to the server or the client directed to the server for rate control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • the present invention relates to a digital broadcast transmission/reception apparatus and method. More particularly, the present invention relates to a digital broadcast transmission/reception apparatus and method which use a wide channel bandwidth using a plurality of channels.
  • a terrestrial digital broadcast transmission is performed using a channel bandwidth authorized by a government.
  • U.S. terrestrial digital broadcast transmission standard is Advanced Television System Committee (ATSC) 8-VSB
  • European terrestrial digital broadcast transmission standard is Digital Video Broadcasting-Terrestrial (DVB-T).
  • FIG. 1 illustrates a spectrum of a terrestrial digital broadcast signal.
  • a channel bandwidth is a key factor to determine a data transmission rate. In the same bandwidth, if transmission modes are different and modulation methods are the same, data transmission rates are the same. In DVB-T standard, in 16QAM-3/4 rate coding and 1/4 guard interval, 2K, 4K, and 8K transmission modes have 14.93Mbps data transmission rate.
  • a data transmission rate can increase by changing a modulation manner. For example, if 16QAM changes to 64QAM, a data transmission rate can increase. Using this method, the data transmission rate can increase without alternating a conventional transmission/reception system, but a signal-to-noise ratio (SNR) value for secure broadcast signal transmission increases.
  • SNR signal-to-noise ratio
  • a data transmission rate can increase by spatial multiplexing using a multi-antenna.
  • a data transmission rate can increase using an identical modulation manner by transmitting a plurality of independent data streams.
  • the structure of transmission/reception apparatus becomes complicated by multiplexing of data streams. In particular, if the reception apparatus uses an outdoor antenna, signal transmission to a TV set through a cable costs a lot. Disclosure of Invention
  • An object of the present invention is to provide a digital broadcast transmission/ reception apparatus and method which transmits and receives broadcast signals using a plurality of channels, and adds channel bonding information to a control signal, so that a data transmission rate can securely increase.
  • a digital broadcast transmission apparatus includes a bandwidth determination unit which determines a bandwidth in use according to the data transmission rate of an input broadcast signal, a modulation unit which modulates the broadcast signal in a modulation manner corresponding to the determined bandwidth, a control signal generation unit which generates a control signal including channel bonding information determined by the bandwidth, a signal addition unit which adds the generated control signal to a broadcast signal to be transmitted via each channel, and a transmission unit which transmits the control-signal-added broadcast signal via a plurality of channels corresponding to the bandwidth.
  • the control signal may be one of a transmission parameter signal (TPS) or a field sync signal, and the control signal generation unit may insert the channel bonding information into part of bits of the TPS or part of bits of the field sync signal.
  • TPS transmission parameter signal
  • field sync signal the control signal generation unit may insert the channel bonding information into part of bits of the TPS or part of bits of the field sync signal.
  • the control signal generation unit may allocate two bits in a redundant area of the control signal as a channel bonding information inserting area, and determine bit values of the channel bonding information inserting area according to a relative position of each channel from among the plurality of channels.
  • the control signal generation unit may determine that a first bit value of the channel bonding information inserting area is 1 if a current channel is bonded with a previously adjacent channel from among the plurality of channels, and the control signal generation unit may determine that a second bit value of the channel bonding information inserting area is 1 if the current channel is bonded with the subsequently adjacent channel from among the plurality of channels.
  • the number of the plurality of channels which are used in order for the transmission unit to transmit the control-signal-added broadcast signal may be determined according to magnification of a basic bandwidth for the determined bandwidth.
  • the transmission unit may determine a center frequency according to the determined bandwidth, and transmit the control-signal-added broadcast signal using the determined center frequency.
  • the apparatus may further include a scrambler which scrambles the input broadcast signal, and an encoder which encodes the scrambled broadcast signal.
  • the apparatus may further include a multiplexer which multiplexes a main broadcast signal and an auxiliary broadcast signal.
  • a digital broadcast reception apparatus includes a reception unit which receives a broadcast signal from a transmission apparatus, a control signal analysis unit which extracts a control signal from the received broadcast signal, and determines a bandwidth which has been used to transmit the broadcast signal by analyzing channel bonding information included in the extracted control signal, and a demodulation unit which demodulates the control- signal-extracted broadcast signal using the determined bandwidth.
  • the control signal may be one of a transmission parameter signal (TPS) or a field sync signal.
  • TPS transmission parameter signal
  • FPS field sync signal
  • the control signal analysis unit may determine whether or not channels are bonded with each other, and which bandwidth has been used to transmit the broadcast signal, based on bit values on a channel bonding information inserting area of the control signal.
  • the control signal analysis unit may determine that a current channel is bonded with a previously adjacent channel from among a plurality of channels if a first bit value in the channel bonding information inserting area is 1, and the control signal analysis unit may determine that the current channel is bonded with a subsequently adjacent channel from among the plurality of channels if a second bit value in the channel bonding information inserting area is 1.
  • the apparatus may further include a decoder which decodes the demodulated broadcast signal, and a descrambler which descrambles the decoded broadcast signal.
  • the apparatus may further include a demultiplexer which divides the broadcast signal into a main broadcast signal and an auxiliary broadcast signal.
  • a method for transmitting a digital broadcast includes determining a bandwidth in use according to the data transmission rate of an input broadcast signal, modulating the broadcast signal in a modulation manner corresponding to the determined bandwidth, generating a control signal including channel bonding information determined by the bandwidth, adding the generated control signal to a broadcast signal to be transmitted via each channel, and transmitting the control- signal- added broadcast signal via a plurality of channels corresponding to the bandwidth.
  • the control signal may be one of a transmission parameter signal (TPS) or a field sync signal, and in the operation of generating the control signal, the channel bonding information may be inserted into part of bits of the TPS or part of bits of the field sync signal.
  • TPS transmission parameter signal
  • field sync signal a field sync signal
  • two bits in a redundant area of the control signal may be allocated as a channel bonding information inserting area, and bit values of the channel bonding information inserting area may be determined according to a relative position of each channel from among the plurality of channels.
  • a first bit value of the channel bonding information inserting area is 1 if a current channel is bonded with a previously adjacent channel from among the plurality of channels, and it may be determined that a second bit value of the channel bonding information inserting area is 1 if the current channel is bonded with the subsequently adjacent channel from among the plurality of channels.
  • the number of the plurality of channels which are used to transmit the control- signal- added broadcast signal may be determined according to magnification of a basic bandwidth for the determined bandwidth.
  • a center frequency may be determined according to the determined bandwidth, and the control- signal-added broadcast signal may be transmitted using the determined center frequency.
  • the method may further include multiplexing a main broadcast signal and an auxiliary broadcast signal.
  • a method for receiving a digital broadcast includes receiving a broadcast signal from a transmission apparatus, extracting a control signal from the received broadcast signal, determining a bandwidth which has been used to transmit the broadcast signal by analyzing channel bonding information included in the extracted control signal, and demodulating the control-signal-extracted broadcast signal using the determined bandwidth.
  • the control signal may be one of a transmission parameter signal (TPS) or a field sync signal.
  • TPS transmission parameter signal
  • FPS field sync signal
  • determining the bandwidth it may be determined that a current channel is bonded with a previously adjacent channel from among a plurality of channels if a first bit value in the channel bonding information inserting area is 1, and it may be determined that the current channel is bonded with a subsequently adjacent channel from among the plurality of channels if a second bit value in the channel bonding information inserting area is 1.
  • the method may further include dividing the demodulated broadcast signal into a main broadcast signal and an auxiliary broadcast signal.
  • a broadcast signal is transmitted and received via a plurality channels, and channel bonding information is added to a control signal, so a data transmission rate can securely increase without making the reception apparatus complicated.
  • the reception apparatus can receive both a signal having a conventional bandwidth and a channels-bonded signal by informing the reception apparatus of a bandwidth of a channel via which a broadcast signal is transmitted using a control signal such as a TPS.
  • FIG. 1 illustrates a spectrum of a terrestrial digital broadcast signal
  • FIG. 2 is a block diagram illustrating a digital broadcast transmission apparatus according to an exemplary embodiment of the present invention
  • FIGS. 3 and 4 illustrate channel bonding which are applied to the present invention
  • FIG. 5 illustrates an example of a control signal which is generated by the digital broadcast transmission apparatus of FIG. 2;
  • FIG. 6 is a block diagram illustrating a digital broadcast transmission apparatus according to another exemplary embodiment of the present invention.
  • FIG. 7 is a block diagram illustrating a digital broadcast reception apparatus according to an exemplary embodiment of the present invention.
  • FIG. 8 is a block diagram illustrating a digital broadcast reception apparatus according to another exemplary embodiment of the present invention.
  • FIG. 9 is a flow chart illustrating a digital broadcast transmission method according to an exemplary embodiment of the present invention.
  • FIG. 10 is a flow chart illustrating a digital broadcast reception method according to an exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a digital broadcast transmission apparatus according to an exemplary embodiment of the present invention.
  • the digital broadcast transmission apparatus 100 includes a bandwidth determination unit 110, a scrambler 120, an encoder 130, a modulation unit 140, a control signal generation unit 150, a signal addition unit 160, and a transmission unit 170.
  • the digital broadcast transmission apparatus 100 is an example of European DVB-T transmission apparatus.
  • the bandwidth determination unit 110 determines a bandwidth for transmitting a broadcast signal according to a data transmission rate of the broadcast signal. For example, the bandwidth determination unit 110 determines that a bandwidth is 8MHz if a data transmission rate of a broadcast signal is 18Mbps, and the bandwidth determination unit 110 determines that a bandwidth is 16MHz if a data transmission rate of a broadcast signal is 24Mbps. The bandwidth determination unit 110 provides the modulation unit 140, the control signal generation unit 150, and the transmission unit 170 with information on the determined bandwidth.
  • bandwidth determination unit 110 determines that the bandwidth for broadcast signal transmission is 8MHz, channel bonding is not necessary since transmission is enabled using a basic bandwidth. However, if the bandwidth determination unit 110 determines that the bandwidth for broadcast signal transmission is 16MHz, broadcast signals need to be transmitted by bonding two channels.
  • the scrambler 120 scrambles a broadcast signal. More specifically, the scrambler
  • the encoder 130 encodes the scrambled broadcast signal. More specifically, the encoder 130 processes the broadcast signal so that a reception apparatus can recover data errors which may occur in a transmission channel.
  • the encoder 130 applied to the digital broadcast transmission apparatus 100 may be implemented as a forward error correction (FEC) encoder.
  • FEC forward error correction
  • the modulation unit 140 modulates a broadcast signal according to a modulation manner, such as 16QAM or 64QAM, corresponding to a bandwidth which is determined by the bandwidth determination unit 110.
  • the modulation unit 140 modulates the broadcast signal in 16QAM manner. If a bandwidth determined by the bandwidth determination unit 110 is 16MHz, the modulation unit 140 modulates the broadcast signal in 64QAM manner.
  • the control signal generation unit 150 generates a control signal including channel bonding information which is determined using a bandwidth determined by the bandwidth determination unit 110. Since the modulation unit 140 modulates a broadcast signal to be transmitted via a plurality of channels, the control signal generation unit 150 generates each control signal for each broadcast signal to be transmitted via each channel.
  • the control signal may be a transmission parameter signal (TPS) since the digital broadcast transmission apparatus 100 is described as European DVB-T transmission apparatus.
  • TPS transmission parameter signal
  • the control signal may be a field sync signal.
  • the control signal generation unit 150 inserts channel bonding information into certain bits of the TPS.
  • the channel bonding information describes whether a current channel is bonded with adjacent channels from among a plurality of channels.
  • the channel bonding is to use the plurality of channels as a single channel, and the current channel can be bonded with a previously adjacent channel and a subsequently adjacent channel.
  • two channels are bonded with each other as an example, but the number of channels which are able to be bonded with each other is not limited thereto.
  • the control signal generation unit 150 may allocate 2 bits of a redundant area to a channel bonding information inserting area, and bit values of the channel bonding information inserting area can be determined according to a position of the current channel relative to other channels which are bonded with the current channel.
  • the control signal generation unit 150 determines that a first bit value of the channel bonding information inserting area is " 1"
  • the control signal generation unit 150 determines that a second bit value of the channel bonding information inserting area is " 1".
  • the first and second bit values of the channel bonding information inserting area are 0 and 0, respectively.
  • the first bit value is 1, and the second bit value is determined according to whether or not the current channel is bonded with the subsequently adjacent channel.
  • the control signal generation unit 150 will be described in greater detail below with reference to FIG. 5.
  • the signal addition unit 160 receives a broadcast signal modulated by the modulation unit 140 and a control signal generated by the control signal generation unit 150, and adds each control signal to each broadcast signal according to each channel.
  • the transmission unit 170 transmits the control-signal-added broadcast signal via a plurality of channels corresponding to a bandwidth determined by the bandwidth determination unit 110. That is, the transmission unit 170 determines a center frequency of the bandwidth determined by the bandwidth determination unit 110, and transmits the control- signal- added broadcast signal using the center frequency.
  • the center frequency indicates the center of the entire frequency bandwidths.
  • a broadcast signal is transmitted via a single channel, that is, if channels are not bonded with each other, the transmission unit 170 determines a center frequency of a single channel. If channels are not bonded with each other, the entire channels to be used for transmission are regarded as a single channel and a center frequency of the single channel is determined. Therefore, a broadcast signal can be transmitted via a plurality of channels.
  • the transmission unit 170 may be implemented as a radio frequency (RF) up- converter, which loads a control- signal- added broadcast signal on an RF and transmits it.
  • RF radio frequency
  • FIGS. 3 and 4 illustrate channel bonding which are applied to the present invention.
  • the bandwidth determination unit 110 determines that a bandwidth (BW) is 8MHz. In general, a single channel has a bandwidth of 8MHz. Therefore, as shown in FIG. 3, if the bandwidth determination unit 110 determines that a bandwidth is 8MHz, channel bonding is not performed.
  • the broadcast signal is transmitted via a single channel in the same manner as a conventional transmission manner.
  • the control signal generation unit 150 can generate a control signal by determining that both the first and second bit values of the channel bonding information inserting area are 0.
  • the bandwidth determination unit 110 determines that a bandwidth is 16MHz. In general, since a single channel has a bandwidth of 8MHz, two channels are bonded with each other.
  • the modulation unit 140 modulates the broadcast signal in 64QAM and the control signal generation unit 150 adds channel bonding information to a control signal.
  • the control signal generation unit 150 determines that the first and second bit values on the channel bonding information inserting area of the control signal of the broadcast signal to be transmitted via channel #N are 1 and 0, and that the first and second bit values on the channel bonding information inserting area of the control signal of the broadcast signal to be transmitted via channel #N-1 are 0 and 1.
  • FIG. 5 illustrates an example of a control signal which is generated by the digital broadcast transmission apparatus of FIG. 2.
  • the 150 of the digital broadcast transmission apparatus 100 may be a TPS or a field sync signal.
  • the control signal is a TPS.
  • the TPS consists of N bits, in which part of N bits are standardized for a particular purpose, and another part of N bits are allocated as a redundant area which can change according to purpose.
  • the control signal generation unit 150 inserts channel bonding information into part of the redundant area of the TPS.
  • the control signal generation unit 150 allocates two bits in the redundant area of the TPS as a channel bonding information inserting area 210, and determines the two bit values according to relative position of each channel from among a plurality of channels.
  • control signal generation unit 150 allocates bit #3 (212) and bit #4
  • bit #3 (212) is the first bit value and a value of bit #4 (214) is the second bit value.
  • bit values 1 and 0 are inserted into bit #3 (212) and bit #4 (214) of a broadcast signal to be transmitted via channel #N, respectively. That is, in the broadcast signal to be transmitted via channel #N, the first bit value is 1, and the second bit value is 0.
  • bit values 0 and 1 are inserted into bit #3 (212) and bit #4 (214) of a broadcast signal to be transmitted via channel #N-1, respectively. That is, in the broadcast signal to be transmitted via channel #N-1, the first bit value is 0, and the second bit value is 1.
  • FIG. 6 is a block diagram illustrating a digital broadcast transmission apparatus according to another exemplary embodiment of the present invention.
  • the digital broadcast transmission apparatus 100 includes a multiplexer 180, a bandwidth determination unit 110, a scrambler 120, an encoder 130, a modulation unit 140, a control signal generation unit 150, a signal addition unit 160, and a transmission unit 170.
  • the digital broadcast transmission apparatus 100 transmits a single broadcast signal via a plurality of channels.
  • the digital broadcast transmission apparatus 100 transmits a main broadcast signal and an auxiliary broadcast signal via a plurality of channels.
  • the main broadcast signal is a signal which is able to output a broadcast by itself
  • the auxiliary broadcast signal is a signal which is not able to output a broadcast by itself. If a broadcast consisting of the main broadcast signal and the auxiliary broadcast signal is output, broadcasting of higher image quality is enabled.
  • the bandwidth determination unit 110, the scrambler 120, the encoder 130, the modulation unit 140, the control signal generation unit 150, the signal addition unit 160, and the transmission unit 170 in FIG. 6 have the same functions as those in FIG. 2, so the same reference numerals are shared, and description is omitted here.
  • the multiplexer 180 receives and multiplexes a main broadcast signal and an auxiliary broadcast signal, so that a single broadcast signal is provided to the scrambler 120.
  • the single broadcast signal multiplexed by the multiplexer 180 is transmitted in a wide bandwidth via a plurality of channels, so a data transmission rate can increase and a reception apparatus can receive broadcasts of higher image quality.
  • FIG. 7 is a block diagram illustrating a digital broadcast reception apparatus according to an exemplary embodiment of the present invention.
  • the digital broadcast reception apparatus 300 includes a reception unit 310, a control signal analysis unit 320, a demodulation unit 330, a decoder 340, and a descrambler 350.
  • the reception unit 310 receives a broadcast signal from a transmission apparatus.
  • the reception unit 310 may be implemented as an RF down-converter, and in this exemplary embodiment of the present invention, the transmission apparatus which transmits the broadcast signal may be the digital broadcast transmission apparatus 100 of FIG. 2.
  • the control signal analysis unit 320 extracts a control signal from the broadcast signal, and determines whether or not channels are bonded with each other based on first and second bit values on a channel bonding information inserting area of the control signal, and which bandwidth has been used for broadcast signal transmission.
  • the control signal analysis unit 320 determines a center frequency of channel by determining which bandwidth has been used for broadcast signal transmission.
  • the control signal analysis unit 320 provides the demodulation unit 330 and the decoder 340 with the bandwidth information.
  • the control signal analysis unit 320 determines that a current channel is bonded with a previously adjacent channel. In addition, if the second bit value in the channel bonding information inserting area is 1, the control signal analysis unit 320 determines that the current channel is bonded with a subsequently adjacent channel.
  • the control signal analysis unit 320 determines that the current channel is bonded with both the previously adjacent channel and the subsequently adjacent channel. That is, this means that three channels or more are bonded with each other.
  • the demodulation unit 330 receives the bandwidth information from the control signal analysis unit 320, and demodulates the broadcast signal using the bandwidth information.
  • the demodulation unit 330 confirms whether or not channels are bonded with each other based on the bandwidth information, and applies this to demodulation of the broadcast signal.
  • the decoder 340 receives the bandwidth information from the control signal analysis unit 320, and decodes the demodulated broadcast signal. The decoder 340 confirms whether or not channels are bonded with each other based on the bandwidth information, and applies this to decoding of the broadcast signal.
  • the descrambler 350 descrambles the decoded broadcast signal since the broadcast signal has been scrambled by the scrambler 120 of the digital broadcast transmission apparatus 100 and transmitted.
  • FIG. 8 is a block diagram illustrating a digital broadcast reception apparatus according to another exemplary embodiment of the present invention.
  • the digital broadcast reception apparatus 300 includes a reception unit 310, a control signal analysis unit 320, a demodulation unit 330, a decoder 340, and a descrambler 350, and a demultiplexer 360.
  • the digital broadcast reception apparatus 300 receives a broadcast signal from the digital broadcast transmission apparatus 100 of FIG. 2. In the exemplary embodiment of FIG. 8, however, the digital broadcast reception apparatus 300 receives a broadcast signal from the digital broadcast transmission apparatus 100 of FIG. 6.
  • the reception unit 310 receives a broadcast signal in which a main broadcast signal and an auxiliary broadcast signal are multiplexed.
  • the demultiplexer 360 demultiplexes a broadcast signal descrambled by the de- scrambler 350 so that a main broadcast signal and an auxiliary broadcast signal are output.
  • FIG. 9 is a flow chart illustrating a digital broadcast transmission method according to an exemplary embodiment of the present invention
  • a digital broadcast transmission method of the digital broadcast transmission apparatus 100 of FIG. 2 is described here. That is, this is a method for transmitting a single broadcast signal via a plurality of channels.
  • the bandwidth determination unit 110 determines a bandwidth for transmitting a broadcast signal according to a data transmission rate of a broadcast signal (S400). For example, the bandwidth determination unit 110 determines that a bandwidth is 8MHz if a data transmission rate of a broadcast signal is 18Mbps, and the bandwidth determination unit 110 determines that a bandwidth is 16MHz if a data transmission rate of a broadcast signal is 24Mbps.
  • the scrambler 120 scrambles the broadcast signal (S410), and the encoder 130 encodes the scrambled broadcast signal (S420).
  • the modulation unit 140 modulates the encoded broadcast signal (S430). In this case, the modulation unit 140 determines an appropriate modulation manner based on the bandwidth determined by the bandwidth determination unit 110, and modulates the broadcast signal in the determined modulation manner. For example, if two channels are bonded with each other, the bandwidth determination unit 110 determines that the bandwidth is 16MHz, and the modulation unit 140 modulates the broadcast signal in 64QAM.
  • the control signal generation unit 150 receives the determined bandwidth, and generates a control signal including channel bonding information determined based on the bandwidth (S440). As shown in the channel bonding information of Table 1, bit values can be determined according to relative position of each channel from among a plurality of channels.
  • the broadcast signal modulated by the modulation unit 140 and the control signal generated by the control signal generation unit 150 are input to the signal addition unit 160.
  • the signal addition unit 160 adds the control signal to the broadcast signal (S450).
  • the transmission unit 170 loads the control- signal- added broadcast signal on an RF, and transmits it (S460).
  • the multiplexer 180 multiplexes a main broadcast signal and an auxiliary broadcast signal before operation S400.
  • FIG. 10 is a flow chart illustrating a digital broadcast reception method according to an exemplary embodiment of the present invention.
  • this is a method for receiving a single broadcast signal from the digital broadcast transmission apparatus 100 via a plurality of channels.
  • the reception unit 310 receives a broadcast signal from the digital broadcast transmission apparatus 100 (S500).
  • the control signal analysis unit 320 extracts a control signal from the received broadcast signal (S510).
  • the control signal may be a TPS or a field sync signal. If the control signal is a TPS, the TPS consists of N bits as shown in FIG. 5.
  • control signal analysis unit 320 determines a bandwidth which has been used for broadcast signal transmission by analyzing first and second bit values on a channel bonding information inserting area of the extracted control signal (S520). Therefore, whether or not channels are bonded with each other and which bandwidth has been used for broadcast signal transmission can be determined.
  • the control signal analysis unit 320 provides the demodulation unit 330 and the decoder 340 with the bandwidth information.
  • the demodulation unit 330 demodulates the broadcast signal using the bandwidth information (S530).
  • the decoder 340 decodes the demodulated broadcast signal (S540).
  • the descrambler 350 descrambles the decoded broadcast signal (S550).
  • the demultiplexer 360 demultiplexes the broadcast signal after operation S550 so that a main broadcast signal and an auxiliary broadcast signal are output.
  • the present invention can be applied to a digital broadcast transmission/reception apparatus which provides a digital broadcast service.

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Abstract

Digital broadcast transmission/reception apparatus and method are provided. The digital broadcast transmission apparatus includes a bandwidth determination unit which determines a bandwidth in use according to the data transmission rate of an input broadcast signal, a modulation unit which modulates the broadcast signal in a modulation manner corresponding to the determined bandwidth, a control signal generation unit which generates a control signal including channel bonding information determined by the bandwidth, a signal addition unit which adds the generated control signal to a broadcast signal to be transmitted via each channel, and a transmission unit which transmits the control-signal-added broadcast signal via a plurality of channels corresponding to each bandwidth. Accordingly, a data transmission rate can be stably enhanced.

Description

Description
DIGITAL BROADCASTING TRANSMISSION/RECEPTION APPARATUS AND METHODS THEREOF
Technical Field
[1] The present invention relates to a digital broadcast transmission/reception apparatus and method. More particularly, the present invention relates to a digital broadcast transmission/reception apparatus and method which use a wide channel bandwidth using a plurality of channels. Background Art
[2] A terrestrial digital broadcast transmission is performed using a channel bandwidth authorized by a government. U.S. terrestrial digital broadcast transmission standard is Advanced Television System Committee (ATSC) 8-VSB, and European terrestrial digital broadcast transmission standard is Digital Video Broadcasting-Terrestrial (DVB-T).
[3] FIG. 1 illustrates a spectrum of a terrestrial digital broadcast signal.
[4] For example, in DVB-T of European terrestrial digital broadcast transmission standard, although there are diverse transmission modes, a bandwidth is fixed to 8MHz. As shown in FIG. 1, although there are 2K, 4K, and 8K transmission modes, a bandwidth of signals is fixed to 8MHz.
[5] In general, a channel bandwidth is a key factor to determine a data transmission rate. In the same bandwidth, if transmission modes are different and modulation methods are the same, data transmission rates are the same. In DVB-T standard, in 16QAM-3/4 rate coding and 1/4 guard interval, 2K, 4K, and 8K transmission modes have 14.93Mbps data transmission rate.
[6] For high-quality HD broadcasting, secure transmission and maintenance of a high data transmission rate are required. Methods for increasing a data transmission rate in a fixed channel bandwidth are limited.
[7] Firstly, a data transmission rate can increase by changing a modulation manner. For example, if 16QAM changes to 64QAM, a data transmission rate can increase. Using this method, the data transmission rate can increase without alternating a conventional transmission/reception system, but a signal-to-noise ratio (SNR) value for secure broadcast signal transmission increases.
[8] Secondly, a data transmission rate can increase by spatial multiplexing using a multi-antenna. A data transmission rate can increase using an identical modulation manner by transmitting a plurality of independent data streams. However, the structure of transmission/reception apparatus becomes complicated by multiplexing of data streams. In particular, if the reception apparatus uses an outdoor antenna, signal transmission to a TV set through a cable costs a lot. Disclosure of Invention
Technical Problem
[9] An object of the present invention is to provide a digital broadcast transmission/ reception apparatus and method which transmits and receives broadcast signals using a plurality of channels, and adds channel bonding information to a control signal, so that a data transmission rate can securely increase.
[10]
Technical Solution
[11] In order to achieve the above object, a digital broadcast transmission apparatus according to an exemplary embodiment of the present invention includes a bandwidth determination unit which determines a bandwidth in use according to the data transmission rate of an input broadcast signal, a modulation unit which modulates the broadcast signal in a modulation manner corresponding to the determined bandwidth, a control signal generation unit which generates a control signal including channel bonding information determined by the bandwidth, a signal addition unit which adds the generated control signal to a broadcast signal to be transmitted via each channel, and a transmission unit which transmits the control-signal-added broadcast signal via a plurality of channels corresponding to the bandwidth.
[12] The control signal may be one of a transmission parameter signal (TPS) or a field sync signal, and the control signal generation unit may insert the channel bonding information into part of bits of the TPS or part of bits of the field sync signal.
[13] The control signal generation unit may allocate two bits in a redundant area of the control signal as a channel bonding information inserting area, and determine bit values of the channel bonding information inserting area according to a relative position of each channel from among the plurality of channels.
[14] The control signal generation unit may determine that a first bit value of the channel bonding information inserting area is 1 if a current channel is bonded with a previously adjacent channel from among the plurality of channels, and the control signal generation unit may determine that a second bit value of the channel bonding information inserting area is 1 if the current channel is bonded with the subsequently adjacent channel from among the plurality of channels.
[15] The number of the plurality of channels which are used in order for the transmission unit to transmit the control-signal-added broadcast signal may be determined according to magnification of a basic bandwidth for the determined bandwidth.
[16] The transmission unit may determine a center frequency according to the determined bandwidth, and transmit the control-signal-added broadcast signal using the determined center frequency.
[17] The apparatus may further include a scrambler which scrambles the input broadcast signal, and an encoder which encodes the scrambled broadcast signal.
[18] The apparatus may further include a multiplexer which multiplexes a main broadcast signal and an auxiliary broadcast signal.
[19] A digital broadcast reception apparatus according to an exemplary embodiment of the present invention includes a reception unit which receives a broadcast signal from a transmission apparatus, a control signal analysis unit which extracts a control signal from the received broadcast signal, and determines a bandwidth which has been used to transmit the broadcast signal by analyzing channel bonding information included in the extracted control signal, and a demodulation unit which demodulates the control- signal-extracted broadcast signal using the determined bandwidth.
[20] The control signal may be one of a transmission parameter signal (TPS) or a field sync signal.
[21] The control signal analysis unit may determine whether or not channels are bonded with each other, and which bandwidth has been used to transmit the broadcast signal, based on bit values on a channel bonding information inserting area of the control signal.
[22] The control signal analysis unit may determine that a current channel is bonded with a previously adjacent channel from among a plurality of channels if a first bit value in the channel bonding information inserting area is 1, and the control signal analysis unit may determine that the current channel is bonded with a subsequently adjacent channel from among the plurality of channels if a second bit value in the channel bonding information inserting area is 1.
[23] The apparatus may further include a decoder which decodes the demodulated broadcast signal, and a descrambler which descrambles the decoded broadcast signal.
[24] The apparatus may further include a demultiplexer which divides the broadcast signal into a main broadcast signal and an auxiliary broadcast signal.
[25] A method for transmitting a digital broadcast according to an exemplary embodiment of the present invention includes determining a bandwidth in use according to the data transmission rate of an input broadcast signal, modulating the broadcast signal in a modulation manner corresponding to the determined bandwidth, generating a control signal including channel bonding information determined by the bandwidth, adding the generated control signal to a broadcast signal to be transmitted via each channel, and transmitting the control- signal- added broadcast signal via a plurality of channels corresponding to the bandwidth.
[26] The control signal may be one of a transmission parameter signal (TPS) or a field sync signal, and in the operation of generating the control signal, the channel bonding information may be inserted into part of bits of the TPS or part of bits of the field sync signal.
[27] In the operation of generating the control signal, two bits in a redundant area of the control signal may be allocated as a channel bonding information inserting area, and bit values of the channel bonding information inserting area may be determined according to a relative position of each channel from among the plurality of channels.
[28] In the operation of generating the control signal, it may be determined that a first bit value of the channel bonding information inserting area is 1 if a current channel is bonded with a previously adjacent channel from among the plurality of channels, and it may be determined that a second bit value of the channel bonding information inserting area is 1 if the current channel is bonded with the subsequently adjacent channel from among the plurality of channels.
[29] In the operation of transmitting the control- signal- added broadcast signal, the number of the plurality of channels which are used to transmit the control- signal- added broadcast signal may be determined according to magnification of a basic bandwidth for the determined bandwidth.
[30] In the operation of transmitting the control- signal- added broadcast signal, a center frequency may be determined according to the determined bandwidth, and the control- signal-added broadcast signal may be transmitted using the determined center frequency.
[31] The method may further include multiplexing a main broadcast signal and an auxiliary broadcast signal.
[32] A method for receiving a digital broadcast according to an exemplary embodiment of the present invention includes receiving a broadcast signal from a transmission apparatus, extracting a control signal from the received broadcast signal, determining a bandwidth which has been used to transmit the broadcast signal by analyzing channel bonding information included in the extracted control signal, and demodulating the control-signal-extracted broadcast signal using the determined bandwidth.
[33] The control signal may be one of a transmission parameter signal (TPS) or a field sync signal.
[34] In the operation of extracting the control signal, whether or not channels are bonded with each other, and which bandwidth has been used to transmit the broadcast signal may be determined based on bit values on a channel bonding information inserting area of the control signal.
[35] In the operation of determining the bandwidth, it may be determined that a current channel is bonded with a previously adjacent channel from among a plurality of channels if a first bit value in the channel bonding information inserting area is 1, and it may be determined that the current channel is bonded with a subsequently adjacent channel from among the plurality of channels if a second bit value in the channel bonding information inserting area is 1.
[36] The method may further include dividing the demodulated broadcast signal into a main broadcast signal and an auxiliary broadcast signal.
Advantageous Effects
[37] In digital broadcast transmission/reception apparatus and method according to an exemplary embodiment of the present invention, a broadcast signal is transmitted and received via a plurality channels, and channel bonding information is added to a control signal, so a data transmission rate can securely increase without making the reception apparatus complicated.
[38] Furthermore, the reception apparatus can receive both a signal having a conventional bandwidth and a channels-bonded signal by informing the reception apparatus of a bandwidth of a channel via which a broadcast signal is transmitted using a control signal such as a TPS.
[39]
Brief Description of the Drawings
[40] FIG. 1 illustrates a spectrum of a terrestrial digital broadcast signal;
[41] FIG. 2 is a block diagram illustrating a digital broadcast transmission apparatus according to an exemplary embodiment of the present invention;
[42] FIGS. 3 and 4 illustrate channel bonding which are applied to the present invention;
[43] FIG. 5 illustrates an example of a control signal which is generated by the digital broadcast transmission apparatus of FIG. 2;
[44] FIG. 6 is a block diagram illustrating a digital broadcast transmission apparatus according to another exemplary embodiment of the present invention;
[45] FIG. 7 is a block diagram illustrating a digital broadcast reception apparatus according to an exemplary embodiment of the present invention;
[46] FIG. 8 is a block diagram illustrating a digital broadcast reception apparatus according to another exemplary embodiment of the present invention;
[47] FIG. 9 is a flow chart illustrating a digital broadcast transmission method according to an exemplary embodiment of the present invention; and
[48] FIG. 10 is a flow chart illustrating a digital broadcast reception method according to an exemplary embodiment of the present invention.
[49] *The brief description of the drawings*
[50] 100: digital broadcast transmission apparatus
[51] 110: bandwidth determination unit
[52] 120: scrambler [53] 130: encoder
[54] 140: modulation unit
[55] 150: control signal generation unit
[56] 160: signal addition unit
[57] 170: transmission unit
[58]
[59]
Best Mode for Carrying Out the Invention
[60] Certain exemplary embodiments of the present invention will now be described in greater detail with reference to the accompanying drawings.
[61] FIG. 2 is a block diagram illustrating a digital broadcast transmission apparatus according to an exemplary embodiment of the present invention.
[62] With reference to FIG. 2, the digital broadcast transmission apparatus 100 includes a bandwidth determination unit 110, a scrambler 120, an encoder 130, a modulation unit 140, a control signal generation unit 150, a signal addition unit 160, and a transmission unit 170. The digital broadcast transmission apparatus 100 is an example of European DVB-T transmission apparatus.
[63] The bandwidth determination unit 110 determines a bandwidth for transmitting a broadcast signal according to a data transmission rate of the broadcast signal. For example, the bandwidth determination unit 110 determines that a bandwidth is 8MHz if a data transmission rate of a broadcast signal is 18Mbps, and the bandwidth determination unit 110 determines that a bandwidth is 16MHz if a data transmission rate of a broadcast signal is 24Mbps. The bandwidth determination unit 110 provides the modulation unit 140, the control signal generation unit 150, and the transmission unit 170 with information on the determined bandwidth.
[64] If the bandwidth determination unit 110 determines that the bandwidth for broadcast signal transmission is 8MHz, channel bonding is not necessary since transmission is enabled using a basic bandwidth. However, if the bandwidth determination unit 110 determines that the bandwidth for broadcast signal transmission is 16MHz, broadcast signals need to be transmitted by bonding two channels.
[65] The scrambler 120 scrambles a broadcast signal. More specifically, the scrambler
120 randomizes a broadcast signal, so signal components are uniformly distributed in the entire frequency band.
[66] The encoder 130 encodes the scrambled broadcast signal. More specifically, the encoder 130 processes the broadcast signal so that a reception apparatus can recover data errors which may occur in a transmission channel. The encoder 130 applied to the digital broadcast transmission apparatus 100 may be implemented as a forward error correction (FEC) encoder.
[67] When an error occurs in transmission, a reception apparatus cannot request data retransmission, so the FEC encoder allows the reception apparatus to detect and correct the error.
[68] The modulation unit 140 modulates a broadcast signal according to a modulation manner, such as 16QAM or 64QAM, corresponding to a bandwidth which is determined by the bandwidth determination unit 110.
[69] For example, if a bandwidth determined by the bandwidth determination unit 110 is
8MHz, the modulation unit 140 modulates the broadcast signal in 16QAM manner. If a bandwidth determined by the bandwidth determination unit 110 is 16MHz, the modulation unit 140 modulates the broadcast signal in 64QAM manner.
[70] The control signal generation unit 150 generates a control signal including channel bonding information which is determined using a bandwidth determined by the bandwidth determination unit 110. Since the modulation unit 140 modulates a broadcast signal to be transmitted via a plurality of channels, the control signal generation unit 150 generates each control signal for each broadcast signal to be transmitted via each channel.
[71] In this exemplary embodiment of the present invention, the control signal may be a transmission parameter signal (TPS) since the digital broadcast transmission apparatus 100 is described as European DVB-T transmission apparatus. In the case of U.S. transmission apparatus, the control signal may be a field sync signal.
[72] The control signal generation unit 150 inserts channel bonding information into certain bits of the TPS. The channel bonding information describes whether a current channel is bonded with adjacent channels from among a plurality of channels. The channel bonding is to use the plurality of channels as a single channel, and the current channel can be bonded with a previously adjacent channel and a subsequently adjacent channel. In this exemplary embodiment of the present invention, two channels are bonded with each other as an example, but the number of channels which are able to be bonded with each other is not limited thereto.
[73] The control signal generation unit 150 may allocate 2 bits of a redundant area to a channel bonding information inserting area, and bit values of the channel bonding information inserting area can be determined according to a position of the current channel relative to other channels which are bonded with the current channel.
[74] In greater detail, if the current channel is bonded with the previously adjacent channel, the control signal generation unit 150 determines that a first bit value of the channel bonding information inserting area is " 1", and if the current channel is bonded with the subsequently adjacent channel, the control signal generation unit 150 determines that a second bit value of the channel bonding information inserting area is " 1".
[75] A method for the control signal generation unit determining the first and second bit values is shown below in Table 1.
[76] [77] [78] Table 1
Figure imgf000009_0001
[79] As shown in Table 1, if channels are not bonded, that is, if a broadcast signal is transmitted in a conventional bandwidth, the first and second bit values of the channel bonding information inserting area are 0 and 0, respectively.
[80] In addition, if a current channel is bonded with a previously adjacent channel, the first bit value is 1, and the second bit value is determined according to whether or not the current channel is bonded with the subsequently adjacent channel. The control signal generation unit 150 will be described in greater detail below with reference to FIG. 5.
[81] The signal addition unit 160 receives a broadcast signal modulated by the modulation unit 140 and a control signal generated by the control signal generation unit 150, and adds each control signal to each broadcast signal according to each channel.
[82] The transmission unit 170 transmits the control-signal-added broadcast signal via a plurality of channels corresponding to a bandwidth determined by the bandwidth determination unit 110. That is, the transmission unit 170 determines a center frequency of the bandwidth determined by the bandwidth determination unit 110, and transmits the control- signal- added broadcast signal using the center frequency. The center frequency indicates the center of the entire frequency bandwidths.
[83] In greater detail, if a broadcast signal is transmitted via a single channel, that is, if channels are not bonded with each other, the transmission unit 170 determines a center frequency of a single channel. If channels are not bonded with each other, the entire channels to be used for transmission are regarded as a single channel and a center frequency of the single channel is determined. Therefore, a broadcast signal can be transmitted via a plurality of channels.
[84] The transmission unit 170 may be implemented as a radio frequency (RF) up- converter, which loads a control- signal- added broadcast signal on an RF and transmits it.
[85] FIGS. 3 and 4 illustrate channel bonding which are applied to the present invention.
[86] If a data transmission rate of a broadcast signal to be transmitted is 18Mbps, the bandwidth determination unit 110 determines that a bandwidth (BW) is 8MHz. In general, a single channel has a bandwidth of 8MHz. Therefore, as shown in FIG. 3, if the bandwidth determination unit 110 determines that a bandwidth is 8MHz, channel bonding is not performed.
[87] In this case, the broadcast signal is transmitted via a single channel in the same manner as a conventional transmission manner. Alternatively, the control signal generation unit 150 can generate a control signal by determining that both the first and second bit values of the channel bonding information inserting area are 0.
[88] If a data transmission rate of a broadcast signal to be transmitted is 24Mbps, the bandwidth determination unit 110 determines that a bandwidth is 16MHz. In general, since a single channel has a bandwidth of 8MHz, two channels are bonded with each other.
[89] If the bandwidth determination unit 110 determines that a bandwidth is 16MHz, the modulation unit 140 modulates the broadcast signal in 64QAM and the control signal generation unit 150 adds channel bonding information to a control signal.
[90] As shown in FIG. 4, it is assumed that a current channel #N is bonded with a previously adjacent channel #N-1. In this case, since the two channels are bonded with each other, a bandwidth is 16MHz. Therefore, the control signal generation unit 150 determines that the first and second bit values on the channel bonding information inserting area of the control signal of the broadcast signal to be transmitted via channel #N are 1 and 0, and that the first and second bit values on the channel bonding information inserting area of the control signal of the broadcast signal to be transmitted via channel #N-1 are 0 and 1.
[91] FIG. 5 illustrates an example of a control signal which is generated by the digital broadcast transmission apparatus of FIG. 2.
[92] As described above, a control signal generated by the control signal generation unit
150 of the digital broadcast transmission apparatus 100 may be a TPS or a field sync signal. As this exemplary embodiment of the present invention describes the digital broadcast transmission apparatus 100 of European standard, the control signal is a TPS.
[93] As shown in FIG. 5, the TPS consists of N bits, in which part of N bits are standardized for a particular purpose, and another part of N bits are allocated as a redundant area which can change according to purpose.
[94] The control signal generation unit 150 inserts channel bonding information into part of the redundant area of the TPS. In greater detail, the control signal generation unit 150 allocates two bits in the redundant area of the TPS as a channel bonding information inserting area 210, and determines the two bit values according to relative position of each channel from among a plurality of channels.
[95] In FIG. 5, the control signal generation unit 150 allocates bit #3 (212) and bit #4
(214) of the TPS having N bits as the channel bonding information inserting area 210. A value of bit #3 (212) is the first bit value and a value of bit #4 (214) is the second bit value.
[96] If it is assumed that channel #N and channel #N- 1 are bonded with each other as in
FIG. 4, bit values 1 and 0 are inserted into bit #3 (212) and bit #4 (214) of a broadcast signal to be transmitted via channel #N, respectively. That is, in the broadcast signal to be transmitted via channel #N, the first bit value is 1, and the second bit value is 0.
[97] In addition, bit values 0 and 1 are inserted into bit #3 (212) and bit #4 (214) of a broadcast signal to be transmitted via channel #N-1, respectively. That is, in the broadcast signal to be transmitted via channel #N-1, the first bit value is 0, and the second bit value is 1.
[98] FIG. 6 is a block diagram illustrating a digital broadcast transmission apparatus according to another exemplary embodiment of the present invention.
[99] With reference to FIG. 6, the digital broadcast transmission apparatus 100 includes a multiplexer 180, a bandwidth determination unit 110, a scrambler 120, an encoder 130, a modulation unit 140, a control signal generation unit 150, a signal addition unit 160, and a transmission unit 170.
[100] In the exemplary embodiment of FIG. 2, the digital broadcast transmission apparatus 100 transmits a single broadcast signal via a plurality of channels. In the exemplary embodiment of FIG. 6, however, the digital broadcast transmission apparatus 100 transmits a main broadcast signal and an auxiliary broadcast signal via a plurality of channels.
[101] The main broadcast signal is a signal which is able to output a broadcast by itself, and the auxiliary broadcast signal is a signal which is not able to output a broadcast by itself. If a broadcast consisting of the main broadcast signal and the auxiliary broadcast signal is output, broadcasting of higher image quality is enabled.
[102] The bandwidth determination unit 110, the scrambler 120, the encoder 130, the modulation unit 140, the control signal generation unit 150, the signal addition unit 160, and the transmission unit 170 in FIG. 6 have the same functions as those in FIG. 2, so the same reference numerals are shared, and description is omitted here.
[103] The multiplexer 180 receives and multiplexes a main broadcast signal and an auxiliary broadcast signal, so that a single broadcast signal is provided to the scrambler 120. [104] In this exemplary embodiment of the present invention, the single broadcast signal multiplexed by the multiplexer 180 is transmitted in a wide bandwidth via a plurality of channels, so a data transmission rate can increase and a reception apparatus can receive broadcasts of higher image quality.
[105] FIG. 7 is a block diagram illustrating a digital broadcast reception apparatus according to an exemplary embodiment of the present invention.
[106] With reference to FIG. 7, the digital broadcast reception apparatus 300 includes a reception unit 310, a control signal analysis unit 320, a demodulation unit 330, a decoder 340, and a descrambler 350.
[107] The reception unit 310 receives a broadcast signal from a transmission apparatus. In general, the reception unit 310 may be implemented as an RF down-converter, and in this exemplary embodiment of the present invention, the transmission apparatus which transmits the broadcast signal may be the digital broadcast transmission apparatus 100 of FIG. 2.
[108] The control signal analysis unit 320 extracts a control signal from the broadcast signal, and determines whether or not channels are bonded with each other based on first and second bit values on a channel bonding information inserting area of the control signal, and which bandwidth has been used for broadcast signal transmission. The control signal analysis unit 320 determines a center frequency of channel by determining which bandwidth has been used for broadcast signal transmission. Moreover, the control signal analysis unit 320 provides the demodulation unit 330 and the decoder 340 with the bandwidth information.
[109] In greater detail, if the first bit value in the channel bonding information inserting area is 1, the control signal analysis unit 320 determines that a current channel is bonded with a previously adjacent channel. In addition, if the second bit value in the channel bonding information inserting area is 1, the control signal analysis unit 320 determines that the current channel is bonded with a subsequently adjacent channel.
[110] If both the first and second bit values in the channel bonding information inserting area is 1, the control signal analysis unit 320 determines that the current channel is bonded with both the previously adjacent channel and the subsequently adjacent channel. That is, this means that three channels or more are bonded with each other.
[I l l] The demodulation unit 330 receives the bandwidth information from the control signal analysis unit 320, and demodulates the broadcast signal using the bandwidth information. The demodulation unit 330 confirms whether or not channels are bonded with each other based on the bandwidth information, and applies this to demodulation of the broadcast signal.
[112] The decoder 340 receives the bandwidth information from the control signal analysis unit 320, and decodes the demodulated broadcast signal. The decoder 340 confirms whether or not channels are bonded with each other based on the bandwidth information, and applies this to decoding of the broadcast signal.
[113] The descrambler 350 descrambles the decoded broadcast signal since the broadcast signal has been scrambled by the scrambler 120 of the digital broadcast transmission apparatus 100 and transmitted.
[114] FIG. 8 is a block diagram illustrating a digital broadcast reception apparatus according to another exemplary embodiment of the present invention.
[115] With reference to FIG. 8, the digital broadcast reception apparatus 300 includes a reception unit 310, a control signal analysis unit 320, a demodulation unit 330, a decoder 340, and a descrambler 350, and a demultiplexer 360.
[116] In the exemplary embodiment of FIG. 7, the digital broadcast reception apparatus
300 receives a broadcast signal from the digital broadcast transmission apparatus 100 of FIG. 2. In the exemplary embodiment of FIG. 8, however, the digital broadcast reception apparatus 300 receives a broadcast signal from the digital broadcast transmission apparatus 100 of FIG. 6.
[117] The reception unit 310, the control signal analysis unit 320, the demodulation unit
330, the decoder 340, and the descrambler 350 have the same functions as those in FIG. 7, so the same reference numerals are shared, and description is omitted here. However, the reception unit 310 receives a broadcast signal in which a main broadcast signal and an auxiliary broadcast signal are multiplexed.
[118] The demultiplexer 360 demultiplexes a broadcast signal descrambled by the de- scrambler 350 so that a main broadcast signal and an auxiliary broadcast signal are output.
[119] FIG. 9 is a flow chart illustrating a digital broadcast transmission method according to an exemplary embodiment of the present invention
[120] A digital broadcast transmission method of the digital broadcast transmission apparatus 100 of FIG. 2 is described here. That is, this is a method for transmitting a single broadcast signal via a plurality of channels.
[121] The bandwidth determination unit 110 determines a bandwidth for transmitting a broadcast signal according to a data transmission rate of a broadcast signal (S400). For example, the bandwidth determination unit 110 determines that a bandwidth is 8MHz if a data transmission rate of a broadcast signal is 18Mbps, and the bandwidth determination unit 110 determines that a bandwidth is 16MHz if a data transmission rate of a broadcast signal is 24Mbps.
[122] Subsequently, the scrambler 120 scrambles the broadcast signal (S410), and the encoder 130 encodes the scrambled broadcast signal (S420).
[123] The modulation unit 140 modulates the encoded broadcast signal (S430). In this case, the modulation unit 140 determines an appropriate modulation manner based on the bandwidth determined by the bandwidth determination unit 110, and modulates the broadcast signal in the determined modulation manner. For example, if two channels are bonded with each other, the bandwidth determination unit 110 determines that the bandwidth is 16MHz, and the modulation unit 140 modulates the broadcast signal in 64QAM.
[124] The control signal generation unit 150 receives the determined bandwidth, and generates a control signal including channel bonding information determined based on the bandwidth (S440). As shown in the channel bonding information of Table 1, bit values can be determined according to relative position of each channel from among a plurality of channels.
[125] The broadcast signal modulated by the modulation unit 140 and the control signal generated by the control signal generation unit 150 are input to the signal addition unit 160. The signal addition unit 160 adds the control signal to the broadcast signal (S450).
[126] The transmission unit 170 loads the control- signal- added broadcast signal on an RF, and transmits it (S460).
[127] In the case of the digital broadcast transmission apparatus 100 of FIG. 6, the multiplexer 180 multiplexes a main broadcast signal and an auxiliary broadcast signal before operation S400.
[128] FIG. 10 is a flow chart illustrating a digital broadcast reception method according to an exemplary embodiment of the present invention.
[129] A digital broadcast transmission method of the digital broadcast reception apparatus
300 of FIG. 7 is described here. That is, this is a method for receiving a single broadcast signal from the digital broadcast transmission apparatus 100 via a plurality of channels.
[130] The reception unit 310 receives a broadcast signal from the digital broadcast transmission apparatus 100 (S500).
[131] The control signal analysis unit 320 extracts a control signal from the received broadcast signal (S510). The control signal may be a TPS or a field sync signal. If the control signal is a TPS, the TPS consists of N bits as shown in FIG. 5.
[132] Subsequently, the control signal analysis unit 320 determines a bandwidth which has been used for broadcast signal transmission by analyzing first and second bit values on a channel bonding information inserting area of the extracted control signal (S520). Therefore, whether or not channels are bonded with each other and which bandwidth has been used for broadcast signal transmission can be determined. The control signal analysis unit 320 provides the demodulation unit 330 and the decoder 340 with the bandwidth information.
[133] The demodulation unit 330 demodulates the broadcast signal using the bandwidth information (S530). The decoder 340 decodes the demodulated broadcast signal (S540). The descrambler 350 descrambles the decoded broadcast signal (S550).
[134] If the digital broadcast reception apparatus 300 of FIG. 8 receives a broadcast signal, the demultiplexer 360 demultiplexes the broadcast signal after operation S550 so that a main broadcast signal and an auxiliary broadcast signal are output.
[135] While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Industrial Applicability
[136] The present invention can be applied to a digital broadcast transmission/reception apparatus which provides a digital broadcast service.
[137]

Claims

Claims
[1] A digital broadcast transmission apparatus, comprising: a bandwidth determination unit which determines a bandwidth in use according to the data transmission rate of an input broadcast signal; a modulation unit which modulates the broadcast signal in a modulation manner corresponding to the determined bandwidth; a control signal generation unit which generates a control signal including channel bonding information determined by the bandwidth; a signal addition unit which adds the generated control signal to a broadcast signal to be transmitted via each channel; and a transmission unit which transmits the control- signal- added broadcast signal via a plurality of channels corresponding to the bandwidth.
[2] The apparatus of claim 1, wherein the control signal is one of a transmission parameter signal (TPS) or a field sync signal, and the control signal generation unit inserts the channel bonding information into part of bits of the TPS or part of bits of the field sync signal.
[3] The apparatus of claim 1, wherein the control signal generation unit allocates two bits in a redundant area of the control signal as a channel bonding information inserting area, and determines bit values of the channel bonding information inserting area according to a relative position of each channel from among the plurality of channels.
[4] The apparatus of claim 3, wherein the control signal generation unit determines that a first bit value of the channel bonding information inserting area is 1 if a current channel is bonded with a previously adjacent channel from among the plurality of channels, and the control signal generation unit determines that a second bit value of the channel bonding information inserting area is 1 if the current channel is bonded with the subsequently adjacent channel from among the plurality of channels.
[5] The apparatus of claim 1, wherein the number of the plurality of channels which are used in order for the transmission unit to transmit the control-signal-added broadcast signal is determined according to magnification of a basic bandwidth for the determined bandwidth.
[6] The apparatus of claim 1, wherein the transmission unit determines a center frequency according to the determined bandwidth, and transmits the control- signal-added broadcast signal using the determined center frequency.
[7] The apparatus of claim 1, further comprising: a scrambler which scrambles the input broadcast signal; and an encoder which encodes the scrambled broadcast signal.
[8] The apparatus of claim 1 or claim 7, further comprising: a multiplexer which multiplexes a main broadcast signal and an auxiliary broadcast signal.
[9] A digital broadcast reception apparatus, comprising: a reception unit which receives a broadcast signal from a transmission apparatus; a control signal analysis unit which extracts a control signal from the received broadcast signal, and determines a bandwidth which has been used to transmit the broadcast signal by analyzing channel bonding information included in the extracted control signal; and a demodulation unit which demodulates the control- signal-extracted broadcast signal using the determined bandwidth.
[10] The apparatus of claim 9, wherein the control signal is one of a transmission parameter signal (TPS) or a field sync signal.
[11] The apparatus of claim 9, wherein the control signal analysis unit determines whether or not channels are bonded with each other, and which bandwidth has been used to transmit the broadcast signal, based on bit values on a channel bonding information inserting area of the control signal.
[12] The apparatus of claim 11, wherein the control signal analysis unit determines that a current channel is bonded with a previously adjacent channel from among a plurality of channels if a first bit value in the channel bonding information inserting area is 1, and the control signal analysis unit determines that the current channel is bonded with a subsequently adjacent channel from among the plurality of channels if a second bit value in the channel bonding information inserting area is 1.
[13] The apparatus of claim 9, further comprising: a decoder which decodes the demodulated broadcast signal; and a descrambler which descrambles the decoded broadcast signal.
[14] The apparatus of claim 9 or claim 13, further comprising: a demultiplexer which divides the broadcast signal into a main broadcast signal and an auxiliary broadcast signal.
[15] A method for transmitting a digital broadcast, the method comprising: determining a bandwidth in use according to the data transmission rate of an input broadcast signal; modulating the broadcast signal in a modulation manner corresponding to the determined bandwidth; generating a control signal including channel bonding information determined by the bandwidth; adding the generated control signal to a broadcast signal to be transmitted via each channel; and transmitting the control- signal- added broadcast signal via a plurality of channels corresponding to the bandwidth.
[16] The method of claim 15, wherein the control signal is one of a transmission parameter signal (TPS) or a field sync signal, and in the operation of generating the control signal, the channel bonding information is inserted into part of bits of the TPS or part of bits of the field sync signal.
[17] The method of claim 15, wherein in the operation of generating the control signal, two bits in a redundant area of the control signal are allocated as a channel bonding information inserting area, and bit values of the channel bonding information inserting area are determined according to a relative position of each channel from among the plurality of channels.
[18] The method of claim 17, wherein in the operation of generating the control signal, it is determined that a first bit value of the channel bonding information inserting area is 1 if a current channel is bonded with a previously adjacent channel from among the plurality of channels, and it is determined that a second bit value of the channel bonding information inserting area is 1 if the current channel is bonded with the subsequently adjacent channel from among the plurality of channels.
[19] The method of claim 15, wherein in the operation of transmitting the control- signal-added broadcast signal, the number of the plurality of channels which are used to transmit the control-signal-added broadcast signal is determined according to magnification of a basic bandwidth for the determined bandwidth.
[20] The method of claim 15, wherein in the operation of transmitting the control- signal-added broadcast signal, a center frequency is determined according to the determined bandwidth, and the control- signal- added broadcast signal is transmitted using the determined center frequency.
[21] The method of claim 15, further comprising: multiplexing a main broadcast signal and an auxiliary broadcast signal.
[22] A method for receiving a digital broadcast, the method comprising: receiving a broadcast signal from a transmission apparatus; extracting a control signal from the received broadcast signal; determining a bandwidth which has been used to transmit the broadcast signal by analyzing channel bonding information included in the extracted control signal; and demodulating the control-signal-extracted broadcast signal using the determined bandwidth.
[23] The method of claim 22, wherein the control signal is one of a transmission parameter signal (TPS) or a field sync signal.
[24] The method of claim 22, wherein in the operation of extracting the control signal, whether or not channels are bonded with each other, and which bandwidth has been used to transmit the broadcast signal are determined based on bit values on a channel bonding information inserting area of the control signal.
[25] The method of claim 22, wherein in the operation of determining the bandwidth, it is determined that a current channel is bonded with a previously adjacent channel from among a plurality of channels if a first bit value in the channel bonding information inserting area is 1, and it is determined that the current channel is bonded with a subsequently adjacent channel from among the plurality of channels if a second bit value in the channel bonding information inserting area is 1.
[26] The method of claim 22, further comprising: dividing the demodulated broadcast signal into a main broadcast signal and an auxiliary broadcast signal.
PCT/KR2008/000782 2007-02-15 2008-02-11 Digital broadcasting transmission/reception apparatus and methods thereof WO2008100046A1 (en)

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