CN103532573B - Digital signal transmission method and device - Google Patents
Digital signal transmission method and device Download PDFInfo
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- CN103532573B CN103532573B CN201310358002.3A CN201310358002A CN103532573B CN 103532573 B CN103532573 B CN 103532573B CN 201310358002 A CN201310358002 A CN 201310358002A CN 103532573 B CN103532573 B CN 103532573B
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Abstract
Present invention is disclosed a kind of digital signal transmission method and device, it comprises to split information to be transmitted and to be converted to data symbol; Before data symbol, add frame head form signal frame, wherein said frame head comprises the first synchronous head, signaling symbols and the second synchronous head, described second synchronous head is the frequency displacement sequence of described first synchronous head, described signaling symbols is between the first synchronous head and the second synchronous head, and described signaling symbols comprises the basic signaling information for data symbol described in demodulation; Continuous print signal frame is merged into data flow launch.Have employed technical scheme of the present invention, a kind of signal frame with new frame head structure can be obtained in broadcast system, simplify frame structure, improve system synchronization performance, simultaneously not malfunctioning activity.
Description
Technical field
The present invention relates to a kind of communication means and device, more particularly, relate to a kind of digital signal transmission method for broadcast system and device.
Background technology
In DVB-T2, a T2 frame comprises P1, P2 and data symbol, and wherein P1 has " C-A-B " structure, and not only for preliminary synchronisation, also for carrying the signaling of demodulation P2, structure is more complicated, and PAPR is higher.In Chinese terrestrial digital TV standard (GB2006-20600), a signal frame comprises PN sequence, system signaling and data symbol, and PN sequence does not carry any signaling for other parts of demodulation, but can be used for system synchronization, but net synchronization capability is not enough, system signaling design underaction.
Summary of the invention
Object of the present invention aims to provide a kind of digital signal transmission method and device, solves signal frame structure in existing broadcast system complicated, and the problem that frame head net synchronization capability is not good.
According to above-mentioned purpose, implement a kind of digital signal transmission method of the present invention, it comprises the following steps: information to be transmitted split and be converted to data symbol; Before data symbol, add frame head form signal frame, wherein said frame head comprises the first synchronous head, signaling symbols and the second synchronous head, described second synchronous head is the frequency displacement sequence of described first synchronous head, described signaling symbols is between the first synchronous head and the second synchronous head, and described signaling symbols comprises the basic signaling information for data symbol described in demodulation; Continuous print signal frame is merged into data flow launch.
According to above-mentioned purpose, implement a kind of digital signal transmission device of the present invention, it comprises: data symbol generation module, information to be transmitted is split and is converted to data symbol; First synchronous head generation module, generates the first synchronous head; Second synchronous head generation module, does frequency shift (FS) by described first synchronous head, thus generates the second synchronous head; Signaling symbols generation module, generate signaling symbols, described signaling symbols comprises the basic signaling information for data symbol described in demodulation; Frame head generation module, by described first synchronous head, signaling symbols and described second synchronous head composition frame head, wherein signaling symbols is between the first synchronous head and the second synchronous head; Framing module, adds described frame head and forms signal frame before described data symbol; Transmitter module, is merged into data flow by continuous print signal frame and launches.
Preferably, the first synchronous head is S
n, it can be PN sequence, CAZAC sequence, m sequence or orthogonal complement sequence etc.; Second synchronous head is
wherein f
sHbe the frequency offset of the second synchronous head relative to the first synchronous head.
Preferably, the f in adjacent two signal frame frame heads
sHsymbol identical or contrary.
Preferably, the first synchronous head and the second synchronous head do not carry any information, for system synchronization, clock recovery, preliminary channel estimating.
Preferably, signaling symbols is at least one OFDM symbol, and OFDM symbol comprises signaling symbols Cyclic Prefix and signaling symbols main body, and the variable-length of signaling symbols Cyclic Prefix and signaling symbols main body.
Preferably, basic signaling information comprises the length of these frame data symbol, Cyclic Prefix size, FFT size, modulating mode, interlace mode and the information such as channel coding mode, pilot frequency design pattern.
Preferably, data symbol is at least one OFDM symbol, and described OFDM symbol comprises data symbol cyclic prefix and data symbol body.
Have employed technical scheme of the present invention, a kind of signal frame with new frame head structure can be obtained in broadcast system, simplify frame structure, improve system synchronization performance, simultaneously not malfunctioning activity.
Accompanying drawing explanation
In the present invention, identical Reference numeral represents identical feature all the time, wherein:
Fig. 1 is the structural representation of digital signal transmission device of the present invention;
Fig. 2 is the structural representation of signal frame of the present invention;
Fig. 3 is the structural representation of multiple signal frame;
Fig. 4 is the schematic diagram of the another kind of equivalents mode of signal frame frame head.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, first the present invention discloses a kind of digital signal transmission device 10, its core is four-layer structure, according to the order that signal frame generates and sends, ground floor structure is data symbol generation module 11, first synchronous head generation module 12, signaling symbols generation module 13, second synchronous head generation module 14, second layer structure is frame head generation module 15, and third layer structure is framing module 16, and four-layer structure is transport module 17.
The overall procedure of transmission method of the present invention is:
Information to be transmitted is split and is converted to data symbol by data symbol generation module 11.Meanwhile, the first synchronous head generation module 12 and signaling symbols generation module generate synchronous head 1 and signaling symbols respectively, and synchronous head 1 is done frequency shift (FS) by the second synchronous head generation module 14 subsequently, thus generate synchronous head 2.Therefore, synchronous head 2 is frequency displacement sequences of synchronous head 1.
Synchronous head 1, signaling symbols and synchronous head 2 is formed frame head by frame head generation module 15, each frame head is mixed several data symbols by framing module 16, thus forming signal frame one by one, multiple signal frame is merged into data flow and transmits by transport module 17 continuously subsequently.
The core cell of digital signal transmission device 10 is frame heads that frame head generation module 15 generates, and as shown in Figure 2, each signal frame includes a frame head, and each frame head is made up of 3 parts, i.e. synchronous head 1, signaling symbols and synchronous head 2.Synchronous head 2 is frequency displacement sequences of synchronous head 1, if synchronous head 1 is expressed as S
n, then synchronous head 2 can be expressed as
wherein f
sHfor synchronous head 2 is relative to the frequency offset of synchronous head 1, its concrete value can be self-defined by system.Synchronous head 1 and synchronous head 2 do not carry any signaling information, for system synchronization, clock recovery, preliminary channel estimating.Synchronous head 1 of the present invention and synchronous head 2 can be PN sequence (PN (pseudo noise) sequence, Pseudo-noise Sequence), CAZAC sequence (permanent envelope zero autocorrelation sequence, Constant Amplitude Zero Auto Correlation), various types of sequence such as m sequence or orthogonal complement sequence, digital signal transmission method of the present invention and digital signal transmission device all can be made to set up, therefore the concrete sequence selected by synchronous head 1 and synchronous head 2 is not limited.In addition, synchronous head 1 and synchronous head 2 can adopt permanent width sequence, more excellent for reduction peak-to-average force ratio (PAPR, peak-to-average powerratio) performance.
After the first synchronous head generation module 12 and the second synchronous head generation module 14 generate synchronous head 1 and synchronous head 2 respectively, frame head generation module 15 signaling symbols that inserting signaling symbol generation module 13 generates between synchronous head 1 and synchronous head 2, signaling symbols comprises the basic signaling information for demodulating data symbols.Basic signaling information of the present invention includes but not limited to the length, cyclic prefix mode, the FFT(fast fourier transform that indicate this frame (i.e. current demand signal frame) data symbol, Fast Fourier Transformation) relevant information such as size, modulating mode, interlace mode and channel coding mode, pilot frequency design pattern.
Continue with reference to Fig. 2, signaling symbols by least one OFDM(OFDM, OrthogonalFrequency Division Multiplexing) symbol is formed, and described OFDM symbol is fixed length or variable length.Each OFDM symbol forming signaling symbols includes signaling symbols main body and signaling symbols Cyclic Prefix, and therefore, the basic signaling information carried described in signaling symbols is actually entrained by the signaling symbols main body of each OFDM symbol above-mentioned.In the present embodiment, fixed length or variable length represent that the length of signaling symbols Cyclic Prefix and the length (in other words the length of FFT) of signaling symbols main body are all variable, such as, FFT size can be 4k, 8k, 16k, 32k etc., signaling symbols circulating prefix-length can be 1/4 of FFT length, 1/8 etc.
While frame head generation module 15 has generated frame head, data symbol generation module 11 is by several (at least one) OFDM symbol composition data symbol, and data symbol is mixed frame head by framing module 16 again, thus the signal frame that composition one is complete.Be similar to the structure of signaling symbols, each OFDM symbol of composition data symbol includes data symbol cyclic prefix and data symbol body, the intersymbol interference of data symbol cyclic prefix in order to cause anti-multipath, data symbol body is used for transfer data information.
Between different signal frames, such as signal frame 1 and signal frame 2, the structure of its frame head can be slightly different, as shown in Figure 3.For signal frame 1, its frame head is made up of synchronous head 1, signaling symbols and synchronous head 2 successively, and wherein synchronous head 1 is S
n, synchronous head 2 is
and for signal frame 2, its frame head structure shows as the exchange of synchronous head 1 and synchronous head 2 position compared with signal frame 1, namely the frame head of signal frame 2 is made up of synchronous head 2, signaling symbols and synchronous head 1 successively, and wherein synchronous head 1 remains S
n, synchronous head 2 remains
As shown in Figure 4, in fact, this frame head structure of signal frame 2 can have the mode of another kind of equivalents, and namely synchronous head 1 is expressed as S
n, be signaling symbols after synchronous head 1, be synchronous head 2 after signaling symbols, now synchronous head 2 can be expressed as
in other words, relative to signal frame 1, the synchronous head 2 of signal frame 2 is relative to synchronous head 1 frequency shift (FS)-f
sHobtain.
As can be seen from the structure of the multiple signal frames shown in Fig. 3 and Fig. 4, frame head generation module 15 both can make the f of two adjacent signal frame frame heads
sHsymbol is identical, also can make the f of two adjacent signal frame frame heads
sHsymbol is contrary, and the quantity of OFDM symbol that the data symbol of unlike signal frame comprises also can be identical or different.
Can be found out by technique scheme, synchronous head is divided into two parts by the present invention, and wherein a part is the frequency displacement sequence of another part, can resist mono-tone interference, simplify frame structure, improves system synchronization performance, simultaneously not malfunctioning activity.
It will be understood to one skilled in the art that, above specification is only one or more execution modes in the numerous embodiment of the present invention, and not uses limitation of the invention.Any equalization for the above embodiment changes, modification and the equivalent technical scheme such as to substitute, as long as spirit according to the invention, all will drop in scope that claims of the present invention protect.
Claims (12)
1. a digital signal transmission method, is characterized in that, comprising:
Information to be transmitted is split and is converted to data symbol;
Before data symbol, add frame head form signal frame, wherein said frame head comprises the first synchronous head, signaling symbols and the second synchronous head, described second synchronous head is the frequency displacement sequence of described first synchronous head, described signaling symbols is between the first synchronous head and the second synchronous head, and described signaling symbols comprises the basic signaling information for data symbol described in demodulation;
Continuous print signal frame is merged into data flow launch,
Wherein, described first synchronous head and described second synchronous head do not carry any signaling information completely, for system synchronization, clock recovery, preliminary channel estimating.
2. digital signal transmission method as claimed in claim 1, it is characterized in that, the first synchronous head is S
nsn, it can be PN sequence, CAZAC sequence, m sequence or orthogonal complement sequence etc.; Second synchronous head is
wherein f
sHbe the frequency offset of the second synchronous head relative to the first synchronous head.
3. digital signal transmission method as claimed in claim 2, is characterized in that, the f in adjacent two signal frame frame heads
sHsymbol identical or contrary.
4. digital signal transmission method as claimed in claim 1, it is characterized in that, described signaling symbols is at least one OFDM symbol, and described OFDM symbol comprises signaling symbols Cyclic Prefix and signaling symbols main body, and the variable-length of described signaling symbols Cyclic Prefix and signaling symbols main body.
5. digital signal transmission method as claimed in claim 4, it is characterized in that, described basic signaling information comprises the length of these frame data symbol, Cyclic Prefix size, FFT size, modulating mode, interlace mode and the information such as channel coding mode, pilot frequency design pattern.
6. digital signal transmission method as claimed in claim 1, it is characterized in that, described data symbol is at least one OFDM symbol, and described OFDM symbol comprises data symbol cyclic prefix and data symbol body.
7. a digital signal transmission device, is characterized in that, comprising:
Data symbol generation module, splits information to be transmitted and is converted to data symbol;
First synchronous head generation module, generates the first synchronous head;
Second synchronous head generation module, does frequency shift (FS) by described first synchronous head, thus generates the second synchronous head;
Signaling symbols generation module, generate signaling symbols, described signaling symbols comprises the basic signaling information for data symbol described in demodulation;
Frame head generation module, by described first synchronous head, signaling symbols and described second synchronous head composition frame head, wherein signaling symbols is between the first synchronous head and the second synchronous head;
Framing module, adds described frame head and forms signal frame before described data symbol;
Transmitter module, is merged into data flow by continuous print signal frame and launches,
Wherein, described first synchronous head and the second synchronous head do not carry any signaling information completely, for system synchronization, clock recovery, preliminary channel estimating.
8. digital signal transmission device as claimed in claim 7, it is characterized in that, the first synchronous head is S
n, it can be PN sequence, CAZAC sequence, m sequence or orthogonal complement sequence etc.; Second synchronous head is
wherein f
sHbe the frequency offset of the second synchronous head relative to the first synchronous head.
9. digital signal transmission device as claimed in claim 8, is characterized in that, the f in adjacent two signal frame frame heads
sHsymbol identical or contrary.
10. digital signal transmission device as claimed in claim 7, it is characterized in that, described signaling symbols is at least one OFDM symbol, and described OFDM symbol comprises signaling symbols Cyclic Prefix and signaling symbols main body, and the variable-length of described signaling symbols Cyclic Prefix and signaling symbols main body.
11. digital signal transmission devices as claimed in claim 10, it is characterized in that, described basic signaling information comprises the length of these frame data symbol, Cyclic Prefix size, FFT size, modulating mode, interlace mode and the information such as channel coding mode, pilot frequency design pattern.
12. digital signal transmission devices as claimed in claim 7, it is characterized in that, described data symbol is at least one OFDM symbol, and described OFDM symbol comprises data symbol cyclic prefix and data symbol body.
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| CN101035295A (en) * | 2007-04-16 | 2007-09-12 | 北京航空航天大学 | Frame-synchronization generation method and its device in the ground digital TV system |
| CN101710891A (en) * | 2009-12-01 | 2010-05-19 | 清华大学 | Method and device for generating frame synchronization sequence in digital communication system |
| CN102550096A (en) * | 2009-07-03 | 2012-07-04 | 岩星比德科有限公司 | The use of first and second preambles in wireless communication signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101035295A (en) * | 2007-04-16 | 2007-09-12 | 北京航空航天大学 | Frame-synchronization generation method and its device in the ground digital TV system |
| CN102550096A (en) * | 2009-07-03 | 2012-07-04 | 岩星比德科有限公司 | The use of first and second preambles in wireless communication signals |
| CN101710891A (en) * | 2009-12-01 | 2010-05-19 | 清华大学 | Method and device for generating frame synchronization sequence in digital communication system |
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Address after: Room 1018, block B, No. three East Bridge Road, Pudong New Area, Shanghai, 200125, China Patentee after: Shanghai NERC-DTV National Engineering Research Center Co., Ltd. Address before: 200125 Shanghai East Road, Pudong New Area, No. three, No. 1018 Patentee before: Shanghai NERC-DTV National Engineering Research Center Co., Ltd. |