CN1319376C - Signal transmission method in digital signal transmission system - Google Patents
Signal transmission method in digital signal transmission system Download PDFInfo
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- CN1319376C CN1319376C CNB2003101132828A CN200310113282A CN1319376C CN 1319376 C CN1319376 C CN 1319376C CN B2003101132828 A CNB2003101132828 A CN B2003101132828A CN 200310113282 A CN200310113282 A CN 200310113282A CN 1319376 C CN1319376 C CN 1319376C
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Abstract
The present invention discloses a signal transmission method in a digital signal transmission system. The method divides data flow composed of multiple level symbols into continuous data frames to transmit; each data frame comprises three parts which are respectively presetting information, system information and data information; each data frame forms simple single-order circulation by the three parts. The high-efficiency compact data frame structure transmission method designed by the present invention can support the hybrid transmission of multiple kinds of transmission modes of a system in the mode of taking one frame as the minimal independent transmission unit of different transport services; the flexibility of the system selecting different services is increased; the application range of the system is expanded. The signal transmission method of the present invention not only can be applied to single carrier wave time domain transmission systems but also can be applied to multiple carrier wave frequency domain transmission systems, and can also be used for processing frequency domains of the single carrier wave time domain transmission systems, and therefore, the signal transmission method is more flexible. The method can be used for current digital TV ground broadcasting systems.
Description
Technical field the invention belongs to digital signal transmission field, the data placement method of transmission signals in particularly a kind of DTB Digital Terrestrial Broadcasting transmission.
Background technology as shown in Figure 1, typical wireless transmitting system comprises transmitter and receiver.In the receiver,, then down-conversion needn't be arranged if tuner is arranged.Digital modulation technique adds necessary supplementary more often with encoding digital signals, as: synchronizing signal, pilot signal etc.Digital signal behind the coding forms baseband signal through behind the channel filtering.This baseband signal sends after being modulated onto frequency band corresponding through upconverter.At receiving terminal, tuner transforms to base band after analog to digital converter obtains digital signal with high-frequency signal.This digital signal is resumed the information consistent with transmitting terminal after treatment.
In digital television ground broadcast transmission system, mainly be divided into single carrier wave time domain processing system and multicarrier frequency domain treatment system, the former is as U.S. ATSC 8VSB system, the ISDB-T system of the DVB-TCOFDM system in the latter such as Europe and Japan.
On the transmission data of physical layer, consider under the situation of antagonism channel fading and other interference, need be in the data flow of making a start, add some auxiliary datas, as know information, system information etc., transmit together in company with data message, with helping the receiving end restore data.Various transmission standards are according to the characteristics of self, all to the data transmission method of uniqueness separately should be arranged.Such as, training sequence in the single-carrier system is exactly the information that knows that exists with the preset information form, pilot tone in the multicarrier system also is the information that knows that transmitting-receiving two-end all knows, simultaneously these two systems all can delivery of system information, helps receiving end and determines system mode.
Auxiliary data has damage to efficiency of transmission, but exactly is very important to recovering valid data.Such as the cycle that the information that knows occurs appears, can directly have influence on the ability that the system keeps track dynamics of channels changes; The length of preset information directly influences the ability of channel estimating and the efficient of Channel Transmission; The protection of system information, can also be related to system pattern be discerned reliably, or the like.These all are readily appreciated that; Therefore, how reasonably to arrange the relation of auxiliary data and valid data information, both determined rational data transmission method, just become another key problem of system design; Simultaneously, for expanding all kinds of business from now on, the arrangement of data transmission structure also is necessary for to expand in the future allows some leeway.
For multicarrier system, comprise European DVB-T system and Japanese ISDB-T system, the information spinner that knows in the auxiliary data wherein will exist with the pilot tone form, and is dispersed on the corresponding subcarrier in the OFDM symbol with certain interval.Pilot tone is divided into two kinds of the time dependent mobile pilot tones of fixedly pilot tone and position of fixed position.Its system information also is that correspondence is transmitted on special command transmitting symbol (TPS) subcarrier of OFDM symbol.Consider that multicarrier system need do fast Fourier transform (FFT) and inverse transformation (IFFT) thereof, so the transmission method of multicarrier system just shows the position that its auxiliary data distributes in whole OFDM symbol, referring to Fig. 2.The DMB-T scheme of present domestic Tsing-Hua University has adopted time domain PN (Pseudo-random Noise, pseudo noise) sequence to add the transmission method of frequency domain data, referring to Fig. 3.PN sequence heel the preceding paragraph is used for synthetic Basic Transmission Unit of frequency domain data of IFFT.System information is dispersed in the frequency domain data, and still the subcarrier with ad-hoc location transmits.
As single-carrier system, U.S. ATSC system and the applicant arrange framing, field, segment structure in the ADTB-T system that proposes before this with transmission signals, referring to Fig. 4.In U.S. ATSC system, every frame comprises two, and every comprises 1 field synchronization segments and 312 data segments.Section/field/frame synchronizing signal wherein is exactly the preset information of transmitting-receiving two-end precognition, in the structure of ATSC, exist with 1/313 frame and loop cycle, and, promptly have two rank loop cycle 4/832 to be the circulation of the section in cycle.
Referring to Fig. 5, in the previously presented ADTB-T of the applicant system, under the different modulating pattern, the number of fields difference that every frame comprises, but every all comprise 1 field synchronization segments and 52 data segments.The loop cycle that equally also has two rank.
In new DTB Digital Terrestrial Broadcasting system, because the diversified requirement of broadcasted application, for example TV signal is fixed reception, TV signal moves reception and data-signal moves reception etc.As everyone knows, the fixing reception with moving receives because condition of acceptance is different, and it is to the also correspondingly difference to some extent of requirement of transmission system.Expectation improves data transfer rate during fixing the reception, need realize following the tracks of fast to channel and move when receiving.Existing design does not fully take into account these differences, perhaps transmits the data structure more complicated, is unfavorable for the optimization system performance.
Summary of the invention the purpose of this invention is to provide a kind of new digital signal transmission method.This transmission method can be used for the DTB Digital Terrestrial Broadcasting transmission system.Utilize the succinct data placement of this method for transmitting signals, can either the optimization system performance, can also satisfy the transmission requirement of the multiple transmission mode of DTB Digital Terrestrial Broadcasting transmission simultaneously.
The method for transmitting signals of the present invention design is such: the data flow of transmitting in the digital transmission system of being made up of many level symbols is divided into continuous one by one Frame and transmits; Each Frame comprises 3 parts, is respectively preset information, system information and data message, and forms simple single order circulation with this.Preset information, system information and data message can be different as the original position in the Frame, but order is constant, as preset information, system information, data message, perhaps system information, data message, preset information, perhaps data message, preset information, system information.
Under mixed transmission modes, miscellaneous service modulating mode separately is that unit mixes arbitrarily with the frame, and the modulating mode of each frame is spelt out by the system information in this frame.
The effect of preset information can be a usefulness of making system synchronization, clock recovery, channel estimating and equalizer training.Select suitable PN (Pseudo-random Noise, pseudo noise) sequence, with guarantee that system synchronization obtains fast and reliable and channel estimating rapidly and accurately.In the present invention, preset information can by the additional location number of PN sequence really primary data forms, be 2 power power with the length that guarantees this preset information, and guarantee that the average after the mapping is zero.
System information is to be used to determine the transmission mode of this frame of data information and to be used for following function expansion, as modulating mode, coded system etc.System information in the originating data structure is mainly used in the transmission mode that identifies this frame at receiving terminal, to do corresponding processing.Especially under mixed mode transmissions, the identification of system information is very important.Therefore system information can be passed through certain processing when transmission, can be discerned reliably at receiving terminal guaranteeing.The present invention takes the spread spectrum resist technology to strengthen the robustness of system information, finishes such as employing direct sequence spread spectrum method.
The data message that transmits determines its modulation system, coding mode etc. by system information, this data message both can be a data in time domain information, it also can be the data message of frequency domain, comprising through the data after IFFT or inverse discrete Fourier transformer inverse-discrete (IDFT) processing, also can be the mixing of time domain and frequency domain.
Preset information, system information, data message can all be time-domain signals, can all be frequency-region signals also, can also be the mixing of time domain and frequency-region signal.
In digital transmission system, adopt the efficient succinct data frame structure transmission method of the present invention's design, transmission system can be the minimum component units of transmission data with the frame by the system information position is set.Can be the mixed transport of the multiple transmission mode of mode back-up system of the minimum independent transmission unit of different transport services also simultaneously, increase the flexibility ratio of system's selection different business, expand the range of application of system with frame.With the mode that presets known array, obtaining reliable system synchronization and channel estimating accurately, thereby recover the data message of transmission better.Because the relation of the power power of the length of preset information satisfied 2 can be carried out Fourier transform to preset information, also satisfy the possibility that realizes single carrier frequency domain equalization.The system information of spread spectrum protection has guaranteed that more the safety of transmission system is with reliable.At different transmission systems, the form of data message can time-domain signal, also can be frequency-region signal.Method for transmitting signals of the present invention promptly can be applied to the single carrier wave time domain transmission system, also can be applied to multicarrier frequency domain transmission system, and the frequency domain that can also be used for the single carrier wave time domain transmission system is handled, thereby the work of more making its presence or power felt.This method can be used for present digital tv ground broadcasting.
Description of drawings is described further the present invention below in conjunction with drawings and Examples.
Fig. 1 is the system block diagram of typical Digital Transmission.
Fig. 2 is the data transmission method of European DVB-T, has shown the setting of pilot tone and TPS.
Fig. 3 is the data transmission method of the DMB-T of Tsing-Hua University.
Fig. 4 is the method for transmitting signals of the Frame field structure of U.S. ATSC.
Fig. 5 is the applicant's method for transmitting signals of the ADTB-T Frame field structure of application in the past.
Fig. 6 is first embodiment of digital signal data frame structure transmission means of the present invention.
Fig. 7 is that a plurality of PN sequences are formed preset information.
Fig. 8 is second embodiment of digital signal data frame structure transmission means of the present invention.
Fig. 9 is the 3rd embodiment of digital signal data frame structure transmission means of the present invention.
Embodiment is with reference to Fig. 6, and data-signal transmits according to frame structure, and Frame is made up of preset information, system information and data message three parts, and arranges according to order illustrated.Under mixed transmission modes, miscellaneous service modulating mode separately is that unit mixes arbitrarily with the frame, and the modulating mode of each frame is spelt out by the system information in this frame.
The effect of preset information is a usefulness of making system synchronization, clock recovery, channel estimating and equalizer training.Select suitable PN sequence, with guarantee that system synchronization obtains fast and reliable and channel estimating rapidly and accurately.Therefore the selection of preset information will be carried out according to the actual requirement of system.
In digital terrestrial television transmission system, preset information can select correlation properties good, and the PN sequence that frequency spectrum is smooth is come the synchronous and channel estimating of auxiliary system.Be convenient to carry out the FFT computing that frequency domain is handled, as be used for the adaptive frequency domain equilibrium, preset information length should be chosen as 2 power power.This can by the PN sequence increase suitable figure place really primary data satisfy.Simultaneously in order to make that adding the spectral characteristic that knows the preset information after the data still keeps smooth, selecting really, primary data should guarantee that level and (average) after the preset information mapping are zero.
Preset information can be that a PN sequence adds location number primary data composition really, also can be that a plurality of PN sequences add location number primary data composition really.Such as constituting a length is 1024 preset information, can be with 2 identical (PN511+ ' 0 ') compositions; Also can form with 2 different (PN511+ ' 0 '); Can also add its cyclic extensions with 1 (PN511+ ' 0 ') and form, referring to Fig. 7.
The PN sequence can be selected two sequence of levels used always, also can adopt the better three level PN sequences of correlation properties, also can be the PN sequence etc. of binary PN sequence being carried out obtaining after the 16OQAM mapping 4 level.The level that knows signal of a location number that is added thereafter depends on the level of PN sequence.
The ability of the effect length system keeps track characteristic of channel of preset information, but also influence simultaneously the efficiency of transmission of system, therefore need set according to actual operating position, generally can get 64,256,512,1024 or 2048.Under the situation of wire transmission, channel condition than wireless ground simply become reconciled many, the length of preset information just can be selected the preset information short-and-medium than wireless transmission for use in wire transmission so; And when the zonule transporting speech was professional, the preset information of this transmission mode also can be shorter.
System information in the data structure is the transmission mode that is used for determining this frame of data information, comprises modulation system, coded system etc., so that receiving terminal is made corresponding processing.Especially under mixed mode transmissions, the identification of system information is very important.Therefore system information can be passed through certain processing when transmission, can be discerned reliably at receiving terminal guaranteeing.The present invention takes the spread spectrum resist technology to strengthen the robustness of system information, adopts the direct sequence spread spectrum method to finish, and is used for resisting the situation that has abominable channel fading in digital TV ground transmission.
The same with preset information, the selection of system information also is to decide according to the difference of business demand, and discerns automatically at receiving terminal.Under wire transmission mode, system information can be 32 or 64 long, and under wireless communication mode, can select 64 or 128 long.This also be according under the different transmission environments to the degree of protection needs of system and definite.
The data message that transmits determines its modulation system by system information, coding modes etc., this data message both can be data in time domain information, also can be the data messages of frequency domain, comprising through the data after IFFT or the IDFT processing, also can be the mixing of time domain and frequency domain.Therefore this kind digital signal transmission method can be applied to the single carrier wave time domain transmission system, also can be used for multicarrier frequency domain transmission system, and the frequency domain that can also be used for the single carrier wave time domain transmission system is handled.
Data message in every frame can be two level datas, also can be many level datas.
Preset information, system information, data message can all be time-domain signals, can all be frequency-region signals also, can also be the mixing of time domain and frequency-region signal.
The method for transmitting signals of the present invention design, and do not require that preset information, system information and data message are in first, second and the 3rd position respectively in Frame, that is to say that the starting point of frame can be different.But the order of three parts is constant: Frame can begin with preset information, heel system information and data message; Also can begin with system information, the back is with data message and preset information, referring to Fig. 8; Can also begin with data message, the back is with preset information and system information, referring to Fig. 9.
Claims (10)
1. a kind of method for transmitting signals in the digital signal transmission system, data flow is divided into continuous one by one Frame to be transmitted, and it is characterized in that: each Frame comprises the preset information that can be used as system synchronization, clock recovery, channel estimating and equalizer training, can be used for characterizing the transmission mode of this frame of data information and system information, this three part of data message of future feature expansion;
Preset information, system information and the data message order in Frame is constant, but can be different as the starting point of frame, and forms simple single order circulation with this; Frame can begin with preset information, heel system information and data message; Perhaps begin with system information, the back is with data message and preset information; Perhaps begin with data message, the back is with preset information and system information;
Preset information, system information and data message all are time-domain signals, perhaps all are frequency-region signals, or the mixing of time domain and frequency-region signal.
2. method for transmitting signals according to claim 1 is characterized in that: under mixed transmission modes, miscellaneous service modulating mode separately is that unit mixes arbitrarily with the frame, and the modulating mode of each frame is spelt out by the system information in this frame.
3. method for transmitting signals according to claim 1 is characterized in that: described preset information adds that by at least one time domain PN (pseudo noise) sequence a location number deterministic signal forms, and perhaps is made up of the swept-frequency signal of frequency domain, and its length is 2 power power.
4. method for transmitting signals according to claim 3 is characterized in that:
The PN (pseudo noise) sequence of forming preset information is the PN (pseudo noise) sequence of two level, or the PN (pseudo noise) sequence of many level; The level that knows signal of a location number that is added thereafter depends on the level of PN (pseudo noise) sequence.
5. method for transmitting signals according to claim 4 is characterized in that:
The PN (pseudo noise) sequence of described many level is three level PN (pseudo noise) sequence, or binary PN (pseudo noise) sequence is carried out obtaining after 16OQAM shines upon the PN (pseudo noise) sequence of 4 level.
6. according to claim 3 or 4 described method for transmitting signals, it is characterized in that: selecting really, primary data guarantees the level after preset information shines upon and is zero.
7. according to claim 3 or 4 or 5 described method for transmitting signals, it is characterized in that: the length of described preset information is a kind of in 64,256,512,1024 or 2048.
8. method for transmitting signals according to claim 7 is characterized in that: the level after the preset information mapping and be zero.
9. according to any described method for transmitting signals in the claim 1 to 5, it is characterized in that: adopt the direct sequence spread spectrum method to come spread spectrum protection system information.
10. method for transmitting signals according to claim 9 is characterized in that: under wire transmission mode, the length of system information is 32 or 64; Under wireless communication mode, the length of system information is 64 or 128.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20080001940A (en) * | 2006-06-30 | 2008-01-04 | 엘지전자 주식회사 | Apparatus for receiving braodcasting signals and method thereof |
| CN101106414B (en) * | 2006-07-10 | 2012-07-04 | 华为技术有限公司 | Method for transmitting digital signals in ground broadcasting system |
| CN104202114B (en) * | 2006-07-17 | 2018-11-02 | 上海高清数字科技产业有限公司 | Digital signal receive-transmit system and receiving/transmission method |
| CN101110626B (en) * | 2006-07-17 | 2012-01-04 | 上海高清数字科技产业有限公司 | Digital signal emitting and receiving system and method thereof |
| CN1913396B (en) * | 2006-09-12 | 2011-10-05 | 北京邮电大学 | Single/multiple carrier compatible digital broadcast system communication method |
| CN101286958B (en) * | 2008-04-18 | 2010-12-15 | 北京航空航天大学 | Terrestrial broadcasting channel estimating method for digital television and device thereof |
| CN106413040B (en) * | 2015-07-31 | 2019-06-21 | 北京信威通信技术股份有限公司 | A kind of frequency sweeping method of multicarrier system |
| CN109407583B (en) * | 2018-11-01 | 2020-03-06 | 珠海格力电器股份有限公司 | Signal transmission method, system and equipment |
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| CN1167382A (en) * | 1996-04-04 | 1997-12-10 | 朗迅科技公司 | Transmission system for digital audio-frequency broadcasting |
| CN1239359A (en) * | 1998-04-28 | 1999-12-22 | 三洋电机株式会社 | Digital broadcasting receiver and its receiving method |
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