CN102075480A - Method and system for generating frame synchronization sequences for digital information transmission - Google Patents
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Abstract
The invention relates to a method and system for generating frame synchronization sequences for digital information transmission. The method comprises the following steps: generating a plurality of groups of known sequences according to the quantity of groups of signaling information needing to be transmitted and respectively modulating the known sequences with different groups of signaling information; respectively preprocessing the modulated known sequences; mapping the processed known sequences onto a plurality of subcarriers to obtain frequency domain data blocks; carrying out inverse discrete Fourier transform on the frequency domain data blocks to obtain time domain data blocks; and respectively inserting front guard intervals and back guard intervals in front of and at the back of the time domain data blocks to obtain the frame synchronization sequences. The frame synchronization sequences generated by the method and the system can carry certain amount of physical layer signaling information for a receiver to rapidly complete signal frame capture, preliminary estimate of parameters and transmission of physical layer signaling so as to improve the flexibility and reliability of a signal transmission system.
Description
Technical field
The present invention relates to digital signal transmission technique field, the frame synchronization sequence that relates in particular to a kind of digital information transmission generates method and system.
Background technology
Develop rapidly along with modern communication technology, OFDM (Orthogonal Frequency Division Multiplex, OFDM) technology has been applied in the various digital signal transmission systems, as WLAN (wireless local area network), fixed wireless access, wire and wireless digital audio and video broadcasting transmission standard (Digital Television Terrestrial Broadcasting, DTTB).Europe digital video broadcast-terrestrial (Digital Video Broadcasting-Terrestrial, DVB-T), (Digital Television Multimedia Broadcast has adopted the OFDM technology in DTMB) for second generation DVB-T standard DVB-T2 and Chinese terrestrial DTV transmission standard.
These standards or system all include the definition of different physical layer frame structure, at transmitting terminal, information is sent by the frame structure form of setting, at receiving terminal, according to this frame structure form carry out synchronously, detection, decoding etc. are with recovery raw information.The physical layer signal frame structure is to the performance important influence of whole system.Digit broadcasting system is general to adopt continuous transmission means, and digital communication system generally adopts the burst transfer mode.No matter continuous transmission means or burst transfer mode, the definition of frame structure is constituted with frame synchronization sequence, command transmitting symbol, data symbol, as shown in Figure 1.Wherein, command transmitting symbol and data symbol can be made of one or more single carrier data blocks or OFDM data block.In the DVB-T2 system, the physical layer frame synchronizing sequence has adopted the P1 symbol.The P1 symbol be a segment length that to be 1024 OFDM data block add extended protection in time domain is resultant, its production method is as shown in Figure 2.Wherein, S1 and S2 are the signaling of being transmitted, be mapped to modulation signaling sequence MSS, pass through DBPSK (Differentially Binary phase-shift keying more respectively, the difference binary phase shift keying) differential coding, scrambler, subcarrier choose with 1024 inverse discrete Fourier transforms after, obtain 1024 time domain sequences A.Subcarrier is chosen according to CDS Table and is selected a part of subcarrier to transmit.At last, according to the structure adding time domain protection of C-A-B, C is the last part of A, and B is the preceding part of A.The P1 symbol in the DVB-T2 signal frame structure the insertion position and mode as shown in Figure 3.
(Time Domain Synchronous OFDM TDS-OFDM), adopts time-domain training sequence to fill at interval as protection, and can be used for synchronous and channel estimating etc. to have adopted the time-domain synchronization OFDM technology in the DTMB system.The multilayer multi-frame structure of DTMB system as shown in Figure 4.Use pseudo random sequence (Pseudo-random Noise, PN) replace among the OFDM protection at interval and be used for time synchronized.Especially, known training sequence when the antagonism inter-block-interference plays the protection interval action, can also assist carry out synchronously, regularly recovery, carrier wave recovery, channel estimating and Noise Estimation etc.
In based on the signal frame structure digital transmission system, catching in receiver of frame synchronization finished at first, and the reliability that frame synchronization is caught is the basis of estimation of receiver subsequent parameter and demodulation; In addition, the signal data piece that system is transmitted possesses the parameter of plurality of optional usually, for example data block length, number of sub carrier wave and whether adopt transmit diversity etc.But above-mentioned frame synchronization sequence can only be used for the part synchronizing function, does not carry signaling, and the recipient must make the associating estimation after receiving continuous a plurality of frames, does not support burst transfer.
Summary of the invention
The frame synchronization sequence that the purpose of this invention is to provide a kind of digital information transmission generates method and system, the physical layer signaling information of the frame synchronization sequence portability some that these method and system generate, be used for that receiver finishes fast that signal frame is caught, parameter according to a preliminary estimate and the transmission of physical layer signaling, improve the flexibility and the reliability of signal transmission system, to overcome the deficiencies in the prior art.
For achieving the above object, the present invention adopts following technical scheme.
The frame synchronization sequence generation method of a kind of digital information transmission provided by the invention, the method comprising the steps of:
S1. according to the quantity of the signaling information group of need transmission, generate some groups of known arrays, and modulate described known array respectively with different signaling information groups;
S2. described modulated known array is carried out preliminary treatment respectively;
S3. the known array after will handling is mapped on the plurality of sub carrier wave, obtains block of frequency domain data;
S4. described block of frequency domain data is carried out inverse discrete Fourier transform, obtain time-domain data blocks;
S5. protection interval, protection interval, back before the forward and backward insertion respectively of described time-domain data blocks obtain frame synchronization sequence.
Wherein, the modulation system among the step S1 is BPSK or QPSK, the different different signaling informations of modulation system transmission.
Wherein, among the step S3, the method for described mapping is that the known array after the described processing serves as to be mapped to one section continuous sub-carriers respectively at interval to set number of sub-carriers, and described setting number of sub-carriers is represented different signaling informations.
Wherein, described signaling information group has different weights, and signaling information group weight is high more, and the length of relative known array is long more.
Wherein, the weight of the long more represented signaling information group of the length of described setting number of sub-carriers is high more.
Wherein, described each signaling information group all can comprise one or more information bits.
Wherein, the quantity of described known array is not less than the quantity of described signaling information group waiting for transmission.
Wherein, described preceding protection is spaced apart the back setting cross-talk data block of described time-domain data blocks, and the protection of described back is spaced apart the product of described back setting cross-talk data block and twiddle factor.
Wherein, described twiddle factor is-1.
Wherein, described preliminary treatment is differential coding and/or randomization.
Wherein, described known array is known binary sequence, described binary sequence is the combination in any and the distortion of m sequence, Gold sequence, Walsh sequence, Golay sequence or above-mentioned sequence, described known array is same sequence or for complete identical sequence or all be different sequences, and sequence length is identical or different.
The present invention also provides a kind of frame synchronization sequence generation system of digital information transmission, this system comprises: the sequence generation module, be used for quantity, generate some groups of known arrays, and modulate described known array respectively with different signaling information groups according to the signaling information group of need transmission; Pretreatment module is used for described modulated known array is carried out preliminary treatment respectively; The subcarrier mapping block is used for the known array after handling is mapped to the plurality of sub carrier wave, obtains block of frequency domain data; The time-frequency domain modular converter is used for described block of frequency domain data is carried out inverse discrete Fourier transform, obtains time-domain data blocks; Protection is insert module at interval, is used for protection interval, protection interval, back before the forward and backward insertion respectively of described time-domain data blocks, obtains frame synchronization sequence.
The physical layer signaling information of the frame synchronization sequence portability some that method and system of the present invention generate, receiver can be finished catching of frame synchronization sequence simply and rapidly according to the characteristic of this sequence, and can finish the estimation of preliminary synchronization parameter; Recover signaling information entrained in the frame synchronization sequence by relevant with the distance detecting technology, and utilize this signaling information that the follow-up signal frame is carried out demodulation and data recovery; Accuracy of detection height, implementation structure are simple, and can reliably recover the signaling information of transmission under complicated multipath channel environment.
Description of drawings
Fig. 1 is a digital transmission system frame structure schematic diagram;
Fig. 2 is the production method schematic diagram of P1 symbol among the European DVB-T2;
Fig. 3 is the insertion method of P1 symbol among the European DVB-T2;
Fig. 4 is the stratification frame structure schematic diagram of Chinese DTMB standard;
Fig. 5 is the frame synchronization sequence generation method flow diagram according to the digital information transmission of one embodiment of the present invention;
Fig. 6 is the frame synchronization sequence generation system structure principle chart according to the digital information transmission of one embodiment of the present invention;
Fig. 7 is the frame synchronization sequence structure chart that comprises one group of signaling information according to one embodiment of the present invention;
Fig. 8 is the frame synchronization sequence structure chart that comprises two groups of signaling informations according to another embodiment of the present invention.
Embodiment
The frame synchronization sequence of the digital information transmission that the present invention proposes generates method and system, is described as follows in conjunction with the accompanying drawings and embodiments.
Frame synchronization sequence among the present invention by length be the OFDM data block of N and preceding protection thereof at interval, the back protection forms at interval; portability K signaling information group; can comprise 1 bit signalling information or many bit signallings information, for example essential information of subsequent demodulation such as signal frame FFT length, encoder bit rate and transmit diversity in each signaling information group.As shown in Figure 5, the frame synchronization sequence generation method according to the digital information transmission of one embodiment of the present invention comprises step:
S1. according to the quantity K of the signaling information group of need transmission, generate the known array S that the M group is carried signaling information
1, S
2..., S
M, and with different signaling information groups to be transmitted known array is modulated respectively.Modulation system includes but are not limited to BPSK or QPSK, the different different signaling informations of modulation system transmission, and when adopting BPSK, a sequence can be carried the signaling information of 1 bit, when adopting QPSK, the signaling information of sequence portability 2 bits.Known array S
1, S
2..., S
MBe known binary sequence, include but not limited to the combination in any and the distortion of m sequence, Gold sequence, Walsh sequence, Golay sequence or above-mentioned sequence.M group known array is same sequence or for complete identical sequence or all be different sequences, and sequence length is identical or different.According to the significance level of signaling information, every group of signaling information group has different weights, and signaling information group weight is high more, and the length of relative known array is long more.
S2. modulated known array is carried out preliminary treatment respectively, obtain sequence S '
1, S '
2..., S '
MPreliminary treatment be differential coding and/randomization, the purpose of differential coding is to make receiver can finish incoherent detection to known array on the basis that does not recover synchronizing information fully, the data randomization is that the purpose of scrambler is in order to upset the periodicity of known array, and reduces the peak-to-average power ratio of time domain frame synchronizing sequence.S3. the known array after will handling is mapped on N the subcarrier, obtains block of frequency domain data X.The subcarrier mapping ruler is as follows: sequence S '
1, S '
2..., S '
MServe as to be mapped to one section continuous sub-carriers at interval respectively to set number of sub-carriers respectively, institute's setting number of sub-carriers is at interval represented different signaling informations respectively between the different sequences, and the weight of long more its represented signaling information group of length of setting number of sub-carriers is high more.
S4. (Ineverse Discrete Fourier Transform IDFT), obtains the time-domain data blocks x that length is N block of frequency domain data X to be carried out inverse discrete Fourier transform;
S5. protection interval, back are protected the interval, and are combined to form frame synchronization sequence with time-domain data blocks x before the forward and backward insertion respectively of time-domain data blocks x.Preceding protection interval and protection interval, back are by the back setting section L sub-block B generation of time-domain data blocks x; preceding protection is identical with B at interval; the back protection is spaced apart the product of B and twiddle factor; preferably; twiddle factor is-1; utilize preceding protection interval and the correlation of protection interval, back with time-domain data blocks x like this, receiver can be finished catching frame synchronization sequence by coherent detection.
As shown in Figure 6, frame synchronization sequence generation system according to the digital information transmission of one embodiment of the present invention comprises: sequence generation module 1, be used for quantity, generate some groups of known arrays, and modulate known array respectively with different signaling information groups according to the signaling information group of need transmission; Pretreatment module 2 is used for modulated known array is carried out preliminary treatment respectively; Subcarrier mapping block 3 is used for the known array after handling is mapped to the plurality of sub carrier wave, obtains block of frequency domain data; Time-frequency domain modular converter 4 is used for block of frequency domain data is carried out inverse discrete Fourier transform, obtains time-domain data blocks; Protection is insert module 5 at interval, is used for protection interval, protection interval, back before the forward and backward insertion respectively of time-domain data blocks, and the frame synchronization sequence that is finally generated.
Be illustrated in figure 7 as the synchronizing sequence structure chart that carries one group of signaling information according to the frame synchronization sequence generation method generation of one embodiment of the present invention.Wherein, A, B are combined as the time-domain data blocks x that is generated.The structure of the pairing block of frequency domain data X of x as shown in Figure 7.Choose OFDM sub-carrier number N=1024, frame synchronization sequence carries K=1 group signaling information.Sequence generator produces M=2 known array S
1And S
2Choose S
1And S
2Length be 256.These two sequences through preliminary treatment and subcarrier mapping after, in the position of block of frequency domain data as shown in Figure 6.Distance between two sequences is Δ d.If the signaling of transmission comprises 2 bit informations, then choosing Δ d is 0,128,256 and 512, represents 2 bit-binary data 00,01,10 and 11 respectively.If this signaling need be carried the more bits number, then can further segment two distances between the sequence.
Figure 8 shows that the another kind of embodiment of the frame synchronization sequence structure that generates according to the frame synchronization sequence generation method of one embodiment of the present invention.In the present embodiment, frame synchronization sequence carries two groups of different signaling informations, i.e. K=2.Different is the degree of priority that these two groups of signalings have different brackets, and the weight height is different.At first generate M=4 group known array, S
1, S
2, S
3And S
4, and hypothesis S
1, S
2Relevant with signaling information 1, S
3, S
4Relevant with signaling information 2.If the degree of priority of signaling information 1 is higher than signaling information 2, then choose S
1, S
2Length greater than S
3And S
4Length.After finishing the subcarrier mapping, S
1With S
2Between range difference be Δ d
1, S
3With S
4Between range difference be Δ d
2For the signaling that makes high priority possesses higher transmission reliability, choose Δ d
1Distance greater than Δ d
2Distance.When receiver carries out coherent detection to sequence, long sequence, big range difference will make that Sequence Detection is more reliable like this, and it is lower to detect the error rate.
Above execution mode only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (12)
1. the frame synchronization sequence generation method of a digital information transmission, the method comprising the steps of:
S1. according to the quantity of the signaling information group of need transmission, generate some groups of known arrays, and modulate described known array respectively with different signaling information groups;
S2. described modulated known array is carried out preliminary treatment respectively;
S3. the known array after will handling is mapped on the plurality of sub carrier wave, obtains block of frequency domain data;
S4. described block of frequency domain data is carried out inverse discrete Fourier transform, obtain time-domain data blocks;
S5. protection interval, protection interval, back before the forward and backward insertion respectively of described time-domain data blocks obtain frame synchronization sequence.
2. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1 is characterized in that, the modulation system among the step S1 is BPSK or QPSK, the different different signaling informations of modulation system transmission.
3. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1, it is characterized in that, among the step S3, the method of described mapping is that the known array after the described processing serves as to be mapped to one section continuous sub-carriers respectively at interval to set number of sub-carriers, and described setting number of sub-carriers is represented different signaling informations.
4. the frame synchronization sequence generation method of digital information transmission as claimed in claim 3 is characterized in that, described signaling information group has different weights, and signaling information group weight is high more, and the length of relative known array is long more.
5. the frame synchronization sequence generation method of digital information transmission as claimed in claim 3 is characterized in that, the weight of the long more represented signaling information group of the length of described setting number of sub-carriers is high more.
6. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1 is characterized in that, described each signaling information group all can comprise one or more information bits.
7. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1 is characterized in that, the quantity of described known array is not less than the quantity of described signaling information group waiting for transmission.
8. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1; it is characterized in that; protection is spaced apart the back setting cross-talk data block of described time-domain data blocks before described, and the protection of described back is spaced apart the product that cross-talk data block and twiddle factor are set in described back.
9. the frame synchronization sequence generation method of digital information transmission as claimed in claim 8 is characterized in that, described twiddle factor is-1.
10. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1 is characterized in that, described preliminary treatment is differential coding and/or randomization.
11. frame synchronization sequence generation method as each described digital information transmission of claim 1-10, it is characterized in that, described known array is known binary sequence, described binary sequence is the combination in any and the distortion of m sequence, Gold sequence, Walsh sequence, Golay sequence or above-mentioned sequence, described known array is same sequence or for complete identical sequence or all be different sequences, and sequence length is identical or different.
12. the frame synchronization sequence generation system of a digital information transmission, this system comprises:
The sequence generation module is used for the quantity according to the signaling information group of need transmission, generates some groups of known arrays, and modulates described known array respectively with different signaling information groups;
Pretreatment module is used for described modulated known array is carried out preliminary treatment respectively;
The subcarrier mapping block is used for the known array after handling is mapped to the plurality of sub carrier wave, obtains block of frequency domain data;
The time-frequency domain modular converter is used for described block of frequency domain data is carried out inverse discrete Fourier transform, obtains time-domain data blocks;
Protection is insert module at interval, is used for protection interval, protection interval, back before the forward and backward insertion respectively of described time-domain data blocks, obtains frame synchronization sequence.
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