CN1497916A - Single carrier transmission system able to reducing signal distortion and its method - Google Patents
Single carrier transmission system able to reducing signal distortion and its method Download PDFInfo
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- CN1497916A CN1497916A CNA031391001A CN03139100A CN1497916A CN 1497916 A CN1497916 A CN 1497916A CN A031391001 A CNA031391001 A CN A031391001A CN 03139100 A CN03139100 A CN 03139100A CN 1497916 A CN1497916 A CN 1497916A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
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Abstract
A single carrier transmitting system capable of reducing distortion of transmission signals and a method thereof are provided to reduce distortion of transmission signals in a channel environment where a burst noise exists, and improve the receipt capability of a receiving side. A scrambler(100) randomizes transmitting data signals. An FEC(Forward Error Correction) unit(110) corrects a bit error of an inputted data stream. A section distinguishing unit(141) distinguishes between a frame synchronous section and a data section of a transmission signal. A modulator(143) modulates the distinguished sections in different single carrier methods. A modulation information transmitting unit(145) transmits information related to the modulation methods to a receiving side through the frame synchronous section.
Description
Technical field
The present invention relates generally to single carrier transmitting system and method thereof, relate in particular to the single carrier transmitting system and the method thereof of the reliability that can improve the signal that is transmitted.
Background technology
In communication multimedia, computer and the broadcasting epoch, countries in the world are all always in the broadcasting of digitized simulation type.Particularly, use the digit broadcasting system of satellite to be developed and to have dropped into practicality in developed country such as the U.S., Europe and Japanese.Along with development fast, proposed the different standards that is used for digital broadcasting respectively in various countries.
On December 24th, 1996, the Federal Communications Committee of the U.S. (FCC) passed through the broadcast standard of the digital television standard of Advanced Television Systems Committee as TV of future generation.All terrestrial broadcasting operators must observe and video/audio compression, packet data transmission structure, the modulation ATSC standard relevant with the transmission system standard.Have only the standard of video format not announced (stated), but determine by industrial quarters.
According to the ATSC standard, described video compression scheme adopts the ISO/IEC IS13812-2 standard of motion image expert group 2 (MPEG-2).This standard has been adopted to the standard of all digital broadcasting types of the whole world.Audio compression scheme adopts digital audio compression-3 (AC-3) standard of being proposed by Dolby.The ISO/IEC IS13812 standard of MPEG-2 system has been adopted to a kind of multichannel multiplexing method.This multichannel multiplexing method and video compression scheme are used as in the motion in Europe together.8-vestigial sideband (8-VSB) is adopted to the method for modulation and transmission.Described VSB method is proposed for digital television broadcasting, and the frequency band that uses 6MHz is to obtain the high frequency band efficiency data transfer rate of 19.39Mbps by a simple structure.This also be designed to minimize and the broadcast channel of the existing broadcast system of NTSC (NTSC) between interference.Even for also can stable operation under noise circumstance, this method have been used pilot signal, segment sync signal and field sync signal.Further, for fear of mistake, this method has been used Read-Solomon (RS) sign indicating number and grid (Trellis) coding.
The ATSC digital television standard is to be used to use single carrier VSB method with 6MHz frequency band transmission high-quality video, audio frequency and additional data, and supports terrestrial broadcasting pattern and High Data Rate wired broadcasting pattern simultaneously.The main aspect of this method is the 8-VSB modulator approach, and this method is a kind of modification of existing simulation VSB method, can the modulation of combine digital signal.
Fig. 1 is the schematic block diagram that illustrates according to the digit broadcasting system of ATSC standard.With reference to Fig. 1, described digit broadcasting system comprises scrambler 10, forward error correction (FEC) unit 20, multiplexer (MUX) 30, pilot plug-in unit 40, modulating unit 50 and radio frequency (RF) transducer 60.Described FEC unit 20 comprises Read-Solomon (RS) encoder 21, interleaver 23 and trellis encoder 25.
Scrambler 10 is called as the data random device, and it carries out randomization operation to data signals transmitted, prevent whereby since during synchronous data transmission owing to repeat the problem that synchronizing signal that numeral such as 00000000b or 11111111b cause is lost.The predetermined pattern of scrambler 10 usefulness changes the byte of each data-signal, and this processing be reversed so that accurate value is resumed at receiving terminal.
The order of 23 pairs of data flow of interleaver interweaves, and disperses the data of transmission whereby on time shaft.By doing like this, the data of transmission become and are not afraid of (insensitive) interference.By disperseing the data of transmission, when appearing at certain location, noise kept signal at other frequency band.Receiver reverses above-mentioned processing, reverts to the transmission signals that disperses with primary signal just the same whereby.
Different with RS encoder 21, trellis encoder 25 has a dissimilar FEC structure.And different with the RS encoder 21 that constitutes whole M PEG-II stream, trellis encoder 25 considers that the influence of time encodes.This b referred to as convolution code.Trellis encoder 25 is divided into 42 bit words to the byte of 8 bits.Described 2 bit words quilts and previous word compare, and generate the binary code of one 3 bit, and purpose is to describe the change from previous word to current word.This 3 bit code is transferred to the 8 level code elements of described 8-VSB rather than 2 original bit words (3 bits=8 level).Therefore, 2 bit words that are input to trellis encoder 25 are converted and export as 3 bit signals.Because this feature, 8-VSB is called as 2/3 rate coding device sometimes.The advantage of grid coding is that signal can be followed the tracks of with chronomere, thereby has removed error message.
Behind the grid coding of trellis encoder 25, multiplexer 30 inserts the synchronous and frame synchronization of section in transmission signals.Pilot plug-in unit 40 is inserted into the ATSC pilot tone and has been inserted into section synchronously and the transmission signals of frame synchronization.Here, after just finishing modulation, apply a 1.25v that slight DC deviation is arranged to the 8-VSB baseband signal at once.When this takes place, at slight residual carrier of zero frequency point appearance of modulation spectrum.The residual carrier of this generation is called as " ATSC pilot tone ".
Modulating unit 50 is by using the signal modulation of 8-VSB modulation to receiving from pilot plug-in unit 40.Digital modulation is with a processing that converts digital signal in the phase place of carrier wave, amplitude and the frequency.Therein, phase shift keying (PSK) is the processing that changes phase place according to digital value.The most basic PSK is a binary phase shift keying, has 180 ° phase intervals at 1 bit signal ' 0 ' and ' 1 ' intercarrier.Quadrature Phase Shift Keying (QPSK) is the processing that has 90 ° phase intervals corresponding to 1 code element with 42 bits.The value that obtains multiplying each other by cosine wave and bpsk signal and by sinusoidal wave and bpsk signal multiply each other acquisition the value addition and send this value.8-PSK sends the single code element with 8 level signals, and described 8 level signals have the phase intervals of 3 bits and 45 ° respectively.Because the 8-PSK transmission is three times in the information of BPSK under same bandwidth, 8-PSK has much higher frequency efficiency.Yet,, therefore need very high (much) power keep same transmitted error rate because at the narrow interval of difference phasetophase, it is subjected to The noise easily.
Amplitude-shift keying (ASK) is the processing that changes the amplitude of carrier wave.ASK almost and Modulation and Amplitude Modulation (AM) similar, except the signal of modulation is not an order, but according to the amplitude level of predetermined number.For example, handle through the ASK to 3 bit informations, the ripple of modulation has 8 level, and handles by the ASK to 4 bit informations, and the ripple of modulation has 16 level.Modulated ripple signal is a double-sideband signal.
Amplitude-phase keying is a mode of all transmitting information at the carrier wave of carrier wave and amplitude.Quadrature amplitude modulation changes orthogonality relation, the merging carrier wave of carrier wave and transmits these carrier waves.For example, described 16 QAM can be in same bandwidth for transmission BPSK4 information doubly.Yet, because sign indicating number respectively at narrow interval, therefore needs high power to keep same transmitted error rate.
The frequency spectrum of ASK signal is a double-sideband signal, and therefore, not talkative this channel has been utilized satisfactorily.To produce the VSB signal to these signal band amplitude limits to vestigial sideband.For example, the digital information of 3 bits is represented with 8 level.Produce the 8-VSB signal by the frequency band amplitude limit operation that ASK handles and VSB filters then.Conclusion is: except it can have 8 signals, 8-VSB signal and simulation VSB were very similar.
The signal of 60 pairs of modulation of radio frequency converter carries out radio frequency conversion, and the signal by the antenna transmission modulation.
The ATSC data segment is made of 187 bytes and 20 bytes of original MPEG-II data flow.Behind grid coding, 207 bytes of section are become 828 (207 * 4), 8 level code element stream.
Segment sync signal is the pulse of 41 bytes, and described pulse is repeatedly added to the beginning of data segment and is used to replace the sync byte of original MPEG-II transport stream.Receiver can be distinguished the segment sync signal of the pattern that repeats from the data of completely random, even and can also and disturb when being in the level that does not allow the data self-recovery accurately recovered clock at noise.Figure 2 illustrates the section that segment sync signal (that is, section synchronously) is assigned to its transmission signals.As shown, the section of transmission signals comprises the segment sync signal of 4 code elements, the transmission mode that is respectively 3 pseudo noises (PN) sequence of 63 code elements, 24 code elements, 96 reservation code elements and 12 pre-sign indicating number code elements.The PN sequence is the synchronizing information sequence that is used for the synchronous and channel estimating of receiver.The PN sequence is produced by PN sequence generation unit (not shown), and is inserted in the transmission signals by multiplexer 30.
Fig. 3 is the view of structure that the frame of ATSC data is shown.With reference to Fig. 3, the field of ATSC data comprises 313 continuous data segments, and ATSC field sync (being field sync) becomes the field data section.The ATSC Frame is made of 2 ATSC data fields.
Repeat the ATSC data field with time interval 24.2ms, the 16.7ms perpendicular separation of this and NTSC is similar.Section has well-known data symbols pattern synchronously, and is used in the receiver to remove ghost image.More particularly, remove ghost image and be by relatively, and use the error vector that draws to adjust ghost image and remove the characteristic of equalizer and realize the signal that comprises mistake and field sync.
Fig. 4 is the view that is used for respectively relatively such as the constellation (constellations) of the single-carrier modulated of ATSC.When the frequency f s of sample is 7.14MHz, the VSB modulation is divided into homophase (I) component and quadrature (Q) component to digital signal, and with the clock of 2fs (=14.28MHz) only in synchronous component transmission data.Be different from VSB modulation, described OQAM modulation with the clock of 2fs (=14.28MHz) alternately to (I) component and (Q) component transmission data.Fig. 5 shows respectively the sample data according to these two kinds of modulation.
Such as single carrier transmitting system according to the ATSC standard, have in the single carrier transmitting system of the frame structure of PN sequence quilt and data combination therein, the data of PN sequence and frame or field sync unit are to be transmitted according to same modulator approach.Such transmission system is only used a kind of single-carrier modulated method, and is insecure for the change that is caused by the burst noise in the channel circumstance therefore.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of single carrier transmitting system and method thereof, it not only can suitably deal with the channel circumstance change that is caused by burst noise, can also use multiple single-carrier modulated.
In order to realize top target, provide a kind of single carrier transmitting system.This single carrier transmitting system comprises: the scrambler unit is used for TS (transport stream) scrambler to transmitting; The FEC unit is used for carrying out forward error correction from the TS behind the scrambler of scrambler unit to form the TS of coding; Modulating information generation unit is used to produce the modulation intelligence about modulator approach; Multiplexer module, the TS, section synchronizing information, field sync information and the described modulation intelligence that are used for received code, thereby and insert described section synchronizing information and/or described field sync information and described modulation intelligence to the beginning position of the TS of described coding according to control signal, comprise the multiplexed TS of a frame synchronization zone and data area with formation; Pilot plug-in unit is used for pilot tone is inserted described multiplexed TS; Modulating unit is used for according to the modulation intelligence at the TS of described insertion pilot tone, uses corresponding modulator approach to modulating from frame synchronization zone and data area in the TS output of the insertion pilot tone of described pilot plug-in unit respectively; And radio frequency converter, be used for carry out the radio frequency conversion from the TS after the modulation of described modulating unit.
According to another aspect of the present invention, provide a kind of single carrier transmission method.Described single carrier transmission method comprises following step: to TS (transport stream) scrambler that will transmit; To carrying out forward error correction from the TS behind the scrambler of scrambler unit to form the TS of coding; Generation is about the modulation intelligence of modulator approach; The TS of received code, section synchronizing information, field sync information and described modulation intelligence, thereby and insert described section synchronizing information and/or described field sync information and described modulation intelligence to the beginning position of the TS of described coding according to control signal, comprise the multiplexed TS of a frame synchronization zone and data area with formation; Pilot tone is inserted described multiplexed TS; According to the modulation intelligence in the TS of described insertion pilot tone, use corresponding modulator approach respectively to modulating from frame synchronization zone and data area in the TS output of the insertion pilot tone of described pilot plug-in unit; With the TS behind described modulation step modulated is carried out the radio frequency conversion.
Description of drawings
Above-mentioned target of the present invention and feature are by will be more clear to the explanation of embodiments of the invention with reference to accompanying drawing, wherein:
Fig. 1 is the block diagram that schematically shows according to the digital broadcasting transmission system of ATSC standard;
Fig. 2 is the view that is illustrated in the section of the transmission signals among Fig. 1;
Fig. 3 is the view that the frame structure of the transmission signals among Fig. 1 is shown;
Fig. 4 is the view that is used for the constellation of each single-carrier modulated of comparison;
Fig. 5 is the view that illustrates according to the sample data of each modulation among Fig. 4;
Fig. 6 is the block diagram that schematically shows according to digital broadcasting transmission system of the present invention;
Fig. 7 is the flow chart that the single-carrier modulated method among Fig. 6 is shown;
Fig. 8 is the view that illustrates according to the sample data of the single-carrier modulated of carrying out on the digital broadcasting transmission system among Fig. 6.
Embodiment
Below this, be described with reference to the accompanying drawings the preferred embodiments of the present invention.
Fig. 6 is the block diagram that schematically shows according to digital broadcasting transmission system of the present invention.With reference to Fig. 6, described digital broadcasting transmission system comprises scrambler 100, forward error correction (FEC) unit 110, multiplexer (MUX) 120, pilot plug-in unit 130, regional determining unit 141, modulating unit 143, modulating information generation unit 145 and radio frequency (RF) transducer 150.FEC unit 110 comprises Read-Solomon (RS) encoder 111, interleaver 113 and trellis encoder 115.
During synchronous data transmission, scrambler 100 in order to prevent during synchronous data transmission because the problem of losing such as synchronizing signal that repeats that numeral such as 00000000b or 11111111b cause is carried out random operation to data signals transmitted.The predetermined pattern of scrambler 100 usefulness changes the byte of data-signal, and it is reversed processing to recover accurate initial data at receiver.
The error code of relevant input traffic is corrected in FEC unit 110.Because RS encoder 111, interleaver 113 and trellis encoder 115 quilts will omit further instruction here with same method construct and operation in the digit broadcasting system of ATSC standard.
The modulation intelligence that modulating information generation unit 145 produces about modulator approach.
Pseudo noise (PN) sequence generation unit (not shown) produces the PN sequence, that is, it produces and is used for synchronizing information synchronous between conveyer and receiver, and gives MUX120 the PN sequence transmission that produces subsequently.Here, described " conveyer " refers to the receiving terminal that is equipped with digital broadcasting transmission system to use single carrier mode transmission of digital to broadcast, and " receiver " refers to the receiving terminal that receives the digital broadcasting of transmission with the single carrier mode.
Behind the grid coding that trellis encoder 115 is carried out, MUX120 receives transmission signals (i.e. Bian Ma TS), section synchronizing information, field sync information and modulation intelligence, and inserts section synchronously and PN sequence and at the modulation intelligence of modulating information generation unit 145 generations to the beginning part of the TS of coding.Here, the PN sequence can be used as field sync.As another example, MUX120 inserts the synchronous and modulation intelligence of section to the head part of the TS of coding.By such operation, MUX120 has formed a multiplexed TS who comprises frame synchronization zone and data area.
Modulation intelligence is represented each regional modulator approach and is transferred to receiver by the frame synchronization zone.Therefore, receiver can be dealt with the change of the modulator approach of conveyer effectively.
According to one embodiment of present invention, the frame synchronization zone sequence comprises: section sync symbols, field sync code element and modulation intelligence code element, the data area then comprises the TS of coding.
According to another embodiment of the invention, the frame synchronization zone sequence comprises: field sync code element and modulation intelligence code element, and described data area comprises the TS of coding.
Pilot plug-in unit 130 inserts pilot tone synchronously and in the transmission signals of PN sequence in the section of insertion at least.Here, pilot tone refers to the residual carrier that the zero frequency point (zero frequency poim) at modulation spectrum occurs.
As an example, single carrier transmitting system of the present invention has the frame structure that frame synchronization zone quilt and data area therein merge.In this system, the frame synchronization zone has for example series of 3 PN sequences, and wherein each is made of 511 code elements, and what be right after later is control bit and remaining bit.3 PN sequences of series are called as training symbol.At the bit that is transmitted by the order wire that is used for transfer of data, control bit is the bit that is used to control, for example parity bits, initial bits or end bit.Remaining bit refers to the zone of preparing to be used for time shaft change, Bit-Rate Reduction and error correction.
The data area comprises payload area and tail symbol region.Payload is the zone that is used for the information relevant with the upper strata, and can be used to communication service.The tail code element is used for extraneous information, and is called as ' tail ' symbol region, because it is provided by the final node at frame.
In order to determine frame synchronization zone and data area, the code element of transmission signals in the relevant frame unit of regional determining unit 141 countings, and value of relatively counting and the predetermined number of symbols that is used for each zone.
After frame synchronization zone and data area are definite by regional determining unit 141, modulating unit 143 according to the modulation system of single carrier respectively to area modulation.For example, can be scheduled to modulation for the frame synchronization zone of transmission signals, and modulate with QAM for the modulating data zone is fixed with VSB.In this case, modulating unit 143 is modulated the frame synchronization area modulation according to VSB, and modulates the data area modulation according to QAM.Modulating unit 143 can use OQAM and QAM, VSB and OQAM, QAM and OQAM, OQAM and VSB and QAM and VSB modulation to frame synchronization zone and data area respectively in addition.Preferably the frequency of QAM sampling is half of OQAM, and this is because QAM transmits data to I component and Q component simultaneously.
Radio frequency (RF) transducer 150 converts the transmission signals of modulation to radio frequency, and by the signal after the antenna transmission conversion.
Fig. 7 is the flow chart that the single-carrier modulated method among Fig. 6 is shown.
With reference to Fig. 7, the 100 couples of TS that will transmit in scrambler unit carry out scrambler (step 710).
110 pairs of FEC unit carry out forward error correction (step 720) from the TS behind the scrambler of scrambler unit 100.
Simultaneously, the modulation intelligence that modulating information generation unit 145 produces about each regional modulator approach, it can be transferred to receiver by the frame synchronization zone.
Subsequently, the modulation intelligence of the TS of MUX unit 120 received codes, section synchronizing information, field sync information and generation, thereby and, comprise the multiplexed TS (step 730) of frame synchronization zone and data area with formation according to position insertion section synchronizing information and/or the field sync information and the modulation intelligence of a control signal at the TS of coding.
Subsequently, pilot plug-in unit 130 uses corresponding modulator approach (for example single-carrier modulated method) to modulate (step S750) to carrying out from the frame synchronization zone of the TS output of the insertion pilot tone of pilot plug-in unit 130 and data area according to the modulation intelligence in the TS that inserts pilot tone.
More particularly, at step S750, regional determining unit 141 is according to frame synchronization zone and the data area determined corresponding to the control signal of modulation intelligence from the transmission signals output of pilot plug-in unit 130.
At last, 150 couples of TS from the modulation of modulating unit 143 of radio frequency converter carry out conversion.(step S760).
For instance, can be scheduled to the frame synchronization zone that the VSB modulation is used for transmission signals, and predetermined QAM modulation is used for to the data area modulation.In this case, modulating unit 143 is modulated the frame synchronization area modulation according to VSB, and modulates the data area modulation according to QAM.In addition, modulating unit 143 can be respectively to the modulation of frame synchronization zone and data area use OQAM and QAM, VSB and OQAM, QAM and OQAM, OQAM and VSB and QAM and VSB.Preferably the frequency of QAM sampling is half of OQAM, and this is because QAM transmits data to I component and Q component simultaneously.
Fig. 8 shows an example according to the sample data of the single-carrier modulated of carrying out among Fig. 6 in digital broadcasting transmission system.Though this embodiment has described to be used for two kinds of different modulation at the transmission signals of frame unit, described data area is applicable to three kinds of all modulation.
According to the present invention, single carrier transmitting system can be tackled the change of the channel circumstance that causes owing to burst noise effectively, and also can use multiple single-carrier modulated method.Especially, when using OQAM and QAM, or when VSB and QAM, the clock in frame synchronization zone is to double the speed operation of data field clock.Therefore, receiver can improve the efficient of reception by using equalizer etc.When using VSB and OQAM, with the traditional VSB chopping phase ratio in the channel circumstance of component in burst noise is present in mutually, most distorted signals can reduce.Further, when using OQAM and VSB modulation, compare with traditional OQAM in the channel circumstance of component in short burst noise is present in mutually, most distorted signals can reduce.
Though described the preferred embodiments of the present invention, those skilled in the art is to be understood that the present invention is not limited to described preferred embodiment, limits within the spirit and scope of the present invention as claim and can carry out various variations and change.
Claims (20)
1. single carrier transmitting system comprises:
The scrambler unit is used for TS (transport stream) scrambler to transmitting;
The FEC unit is used for carrying out forward error correction from the TS behind the scrambler of scrambler unit to form the TS of coding;
Modulating information generation unit is used to produce the modulation intelligence about modulator approach;
Multiplexer module, the TS, section synchronizing information, field sync information and the described modulation intelligence that are used for received code, thereby and insert described section synchronizing information and/or described field sync information and described modulation intelligence to the beginning position of the TS of described coding according to control signal, comprise the multiplexed TS of a frame synchronization zone and data area with formation;
Pilot plug-in unit is used for pilot tone is inserted described multiplexed TS;
Modulating unit is used for according to the modulation intelligence at the TS of described insertion pilot tone, uses corresponding modulator approach to modulating from frame synchronization zone and data area in the TS output of the insertion pilot tone of described pilot plug-in unit respectively; With
Radio frequency converter is used for carry out the radio frequency conversion from the TS after the modulation of described modulating unit.
2. single carrier transmitting system as claimed in claim 1, wherein said frame synchronization zone is the section of comprising sync symbols, field sync code element and modulation intelligence code element in regular turn, and described data area comprises the TS of coding.
3. single carrier transmitting system as claimed in claim 1, wherein said frame synchronization zone comprises field sync code element and modulation intelligence code element in regular turn, and described data area comprises the TS of coding.
4. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is according to the frame synchronization area modulation of vestigial sideband (VSB) modulation to transmission signals, and according to quadrature amplitude modulation (QAM) to the data area modulation.
5. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is according to the frame synchronization area modulation of offset quadrature Modulation and Amplitude Modulation (OQAM) to transmission signals, and according to quadrature amplitude modulation (QAM) to the data area modulation.
6. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is according to the frame synchronization area modulation of vestigial sideband (VSB) modulation to transmission signals, and according to offset quadrature Modulation and Amplitude Modulation (OQAM) to the data area modulation.
7. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is according to the frame synchronization area modulation of quadrature amplitude modulation (QAM) to transmission signals, and according to offset quadrature Modulation and Amplitude Modulation (OQAM) to the data area modulation.
8. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is according to the frame synchronization area modulation of offset quadrature Modulation and Amplitude Modulation (OQAM) to transmission signals, and according to vestigial sideband (VSB) modulation to the data area modulation.
9. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is according to the frame synchronization area modulation of quadrature amplitude modulation (QAM) to transmission signals, and according to vestigial sideband (VSB) modulation to the data area modulation.
10. as claim 2 or 3 described single carrier transmitting systems, wherein said modulating unit is that VSB modulation and OQAM use identical sample frequency to carry out modulation, and modulates for QAM uses half sample frequency execution of VSB modulation and OQAM.
11. a single carrier transmission method comprises the following steps:
To TS (transport stream) scrambler that will transmit;
To carrying out forward error correction from the TS behind the scrambler of scrambler unit to form the TS of coding;
Generation is about the modulation intelligence of modulator approach;
The TS of received code, section synchronizing information, field sync information and described modulation intelligence, thereby and insert described section synchronizing information and/or described field sync information and described modulation intelligence to the beginning position of the TS of described coding according to control signal, comprise the multiplexed TS of a frame synchronization zone and data area with formation;
Pilot tone is inserted described multiplexed TS;
According to the modulation intelligence in the TS of described insertion pilot tone, use corresponding modulator approach respectively to modulating from frame synchronization zone and data area in the TS output of the insertion pilot tone of described pilot plug-in unit; With
TS behind described modulation step modulated is carried out the radio frequency conversion.
12. single carrier transmission method as claimed in claim 11, wherein said frame synchronization zone is the section of comprising sync symbols, field sync code element and modulation intelligence code element in regular turn, and described data area comprises the TS of coding.
13. single carrier transmission method as claimed in claim 11, wherein said frame synchronization zone comprises field sync code element and modulation intelligence code element in regular turn, and described data area comprises the TS of coding.
14. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is according to vestigial sideband (VSB) the modulation frame synchronization area modulation to transmission signals, and according to quadrature amplitude modulation (QAM) to the data area modulation.
15. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is according to the frame synchronization area modulation of offset quadrature Modulation and Amplitude Modulation (OQAM) to transmission signals, and according to quadrature amplitude modulation (QAM) to the data area modulation.
16. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is according to vestigial sideband (VSB) the modulation frame synchronization area modulation to transmission signals, and according to offset quadrature Modulation and Amplitude Modulation (OQAM) to the data area modulation.
17. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is according to the frame synchronization area modulation of quadrature amplitude modulation (QAM) to transmission signals, and according to offset quadrature Modulation and Amplitude Modulation (OQAM) to the data area modulation.
18. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is according to the frame synchronization area modulation of offset quadrature Modulation and Amplitude Modulation (OQAM) to transmission signals, and according to vestigial sideband (VSB) modulation to the data area modulation.
19. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is according to the frame synchronization area modulation of quadrature amplitude modulation (QAM) to transmission signals, and according to vestigial sideband (VSB) modulation to the data area modulation.
20. as claim 12 or 13 described single carrier transmission method, wherein said modulation step is that VSB modulation and OQAM modulation use identical sample frequency carrying out modulation, and modulates for QAM uses half sample frequency execution of VSB modulation and OQAM.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR61238/02 | 2002-10-08 | ||
| KR1020020061238A KR100920736B1 (en) | 2002-10-08 | 2002-10-08 | Single carrier transmission system capable of reducing signal distortion and a method therefore |
| KR61238/2002 | 2002-10-08 |
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| CNA2006101468014A Division CN1972260A (en) | 2002-10-08 | 2003-09-30 | Single carrier transmitting system capable of reducing distortion of transmission signals and method thereof |
| CNA2006101468029A Division CN1972261A (en) | 2002-10-08 | 2003-09-30 | Single carrier transmitting system capable of reducing distortion of transmission signals and method thereof |
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| CN1497916A true CN1497916A (en) | 2004-05-19 |
| CN1319353C CN1319353C (en) | 2007-05-30 |
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| CNB031391001A Expired - Fee Related CN1319353C (en) | 2002-10-08 | 2003-09-30 | Single carrier transmission system able to reducing signal distortion and its method |
| CNA2006101468029A Pending CN1972261A (en) | 2002-10-08 | 2003-09-30 | Single carrier transmitting system capable of reducing distortion of transmission signals and method thereof |
| CNA2006101468014A Pending CN1972260A (en) | 2002-10-08 | 2003-09-30 | Single carrier transmitting system capable of reducing distortion of transmission signals and method thereof |
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| CNA2006101468029A Pending CN1972261A (en) | 2002-10-08 | 2003-09-30 | Single carrier transmitting system capable of reducing distortion of transmission signals and method thereof |
| CNA2006101468014A Pending CN1972260A (en) | 2002-10-08 | 2003-09-30 | Single carrier transmitting system capable of reducing distortion of transmission signals and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111233A (en) * | 2009-12-28 | 2011-06-29 | 华为软件技术有限公司 | Method, device and system for processing forward error correction (FEC) data |
| CN113014519A (en) * | 2021-03-05 | 2021-06-22 | 杭州电子科技大学 | Method for avoiding frequency spectrum zero in double-pulse forming transmitting system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100943276B1 (en) * | 2002-10-19 | 2010-02-23 | 삼성전자주식회사 | Single carrier transmission system capable of improving reception efficiency of single carrier receiver |
| KR100469291B1 (en) * | 2003-02-04 | 2005-02-02 | 엘지전자 주식회사 | Timing recovery apparatus |
| KR101092542B1 (en) * | 2004-12-20 | 2011-12-14 | 삼성전자주식회사 | A digital multimedia receiver for processing the multi-carrier modulated signal and the signle-carrier modulated signal and a digital multimedia receiving method thereof |
| CN101488827B (en) * | 2008-01-14 | 2015-07-08 | 华为技术有限公司 | Method and apparatus for implementing data error reporting |
| CN101599811B (en) * | 2008-06-02 | 2011-04-06 | 华为技术有限公司 | Data processing device, communication equipment and data processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6108810A (en) * | 1998-03-27 | 2000-08-22 | Usa Digital Radio, Inc. | Digital audio broadcasting method using puncturable convolutional code |
| KR100304889B1 (en) * | 1998-12-31 | 2001-09-24 | 구자홍 | Apparatus for detecting vsb mode of digital tv |
| AU778986B2 (en) * | 1999-12-15 | 2004-12-23 | Thomson Licensing S.A. | Preparation of data for a Reed-Solomon decoder |
| KR100648331B1 (en) * | 2000-09-26 | 2006-11-23 | 엘지전자 주식회사 | Method for vsb/cofdm signal discrimination of digital television system |
| KR100674423B1 (en) * | 2001-01-19 | 2007-01-29 | 엘지전자 주식회사 | Transmitting/receiving system and data processing method |
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2002
- 2002-10-08 KR KR1020020061238A patent/KR100920736B1/en active IP Right Grant
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- 2003-09-30 CN CNB031391001A patent/CN1319353C/en not_active Expired - Fee Related
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111233A (en) * | 2009-12-28 | 2011-06-29 | 华为软件技术有限公司 | Method, device and system for processing forward error correction (FEC) data |
| WO2011079763A1 (en) * | 2009-12-28 | 2011-07-07 | 华为技术有限公司 | Method for processing forward error correction (fec) data, device and system thereof |
| CN102111233B (en) * | 2009-12-28 | 2014-03-26 | 华为软件技术有限公司 | Method and system for processing forward error correction (FEC) data |
| US8707124B2 (en) | 2009-12-28 | 2014-04-22 | Huawei Technologies Co., Ltd. | Method for processing forward error correction, FEC, data, device and system thereof |
| CN113014519A (en) * | 2021-03-05 | 2021-06-22 | 杭州电子科技大学 | Method for avoiding frequency spectrum zero in double-pulse forming transmitting system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1972260A (en) | 2007-05-30 |
| CN1972261A (en) | 2007-05-30 |
| KR100920736B1 (en) | 2009-10-07 |
| CN1319353C (en) | 2007-05-30 |
| KR20040032284A (en) | 2004-04-17 |
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