CN102075480B - Method and system for generating frame synchronization sequences for digital information transmission - Google Patents
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- CN102075480B CN102075480B CN 200910238447 CN200910238447A CN102075480B CN 102075480 B CN102075480 B CN 102075480B CN 200910238447 CN200910238447 CN 200910238447 CN 200910238447 A CN200910238447 A CN 200910238447A CN 102075480 B CN102075480 B CN 102075480B
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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 (OrthogonalFrequency Division Multiplex, OFDM) technology has been applied in 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), all adopted the OFDM technology in second generation DVB-T standard DVB-T2 and Chinese terrestrial DTV transmission standard (DigitalTelevision Multimedia Broadcast, DTMB).
These standards or system all include the definition of different physical layer frame structure, and at transmitting terminal, the frame structure form of information exchange being crossed setting sends, 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 has important impact to the performance of whole system.Digit broadcasting system is general adopts 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 consisted of 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 is that a segment length is that 1024 OFDM data block adds extended protection resulting in time domain, and its production method as shown in Figure 2.Wherein, S1 and S2 are the signaling of transmitting, be mapped to modulation signaling sequence MSS, pass through respectively again DBPSK (Differentially Binary phase-shift keying, the difference binary phase shift keying) differential coding, scrambler, subcarrier choose with 1024 inverse discrete Fourier transforms after, obtain the time domain sequences A of 1024.Subcarrier is chosen according to CDS Table and is selected a part of subcarrier to transmit.At last, add the time domain protection according to the structure of C-A-B, C is the last part of A, and B is the front portion of A.The P1 symbol in the DVB-T2 signal frame structure the insertion position and mode as shown in Figure 3.
Adopted time-domain synchronization OFDM technology (Time DomainSynchronous OFDM, TDS-OFDM) in the DTMB system, adopted time-domain training sequence as protection interval filling, and can be used for synchronous and channel estimating etc.The multilayer multi-frame structure of DTMB system as shown in Figure 4.Use pseudo random sequence (Pseudo-random Noise, PN) replace the protection interval in OFDM and be used for time synchronized.Especially, known training sequence can also be assisted and carry out synchronous, regularly recovery, carrier wave recovery, channel estimating and noise estimation etc. when the antagonism inter-block-interference is played the protection interval action.
In based on the signal frame structure digital transmission system, catching in receiver of frame synchronization completed at first, and the reliability that frame synchronization is caught is the basis of the 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, such as 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 Partial synchronization 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 the method and system generate, be used for receiver settling signal frame-grab fast, parameter according to a preliminary estimate and the transmission of physical layer signaling, improve 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 respectively described known array with different signaling information groups;
S2. described modulated known array is carried out respectively preliminary treatment;
S3. the known array after processing is mapped on some subcarriers, 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. protect interval, rear protection interval before described time-domain data blocks forward and backward inserts respectively, obtain frame synchronization sequence.
Wherein, the modulation system in step S1 is BPSK or QPSK, the different different signaling informations of modulation system transmission.
Wherein, in step S3, the method for described mapping is that the known array after described processing is mapped to respectively one section continuous subcarrier to set number of sub-carriers as the interval, and described setting number of sub-carriers represents different signaling informations.
Wherein, described signaling information group has different weights, and signaling information group weight is higher, and the length of relative known array is longer.
Wherein, the weight of the longer represented signaling information group of the length of described setting number of sub-carriers is higher.
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 front protection is spaced apart the rear setting cross-talk data block of described time-domain data blocks, and described rear protection is spaced apart the product of described rear 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 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 be all 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 the quantity according to the signaling information group of need transmission, generate some groups of known arrays, and modulate respectively described known array with different signaling information groups; Pretreatment module is used for described modulated known array is carried out respectively preliminary treatment; The subcarrier mapping block, the known array after being used for processing is mapped to some subcarriers, 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 interval insert module is used for protecting interval, rear protection interval before described time-domain data blocks forward and backward inserts respectively, obtain 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 completed catching of frame synchronization sequence simply and rapidly according to the characteristic of this sequence, and can complete the estimation of preliminary synchronization parameter; By relevant with recover signaling information entrained in frame synchronization sequence apart from detection technique, and utilize this signaling information to carry out demodulation and data recovery to the follow-up signal frame; Accuracy of detection is high, implementation structure is simple, and can go out the signaling information of transmission by Trusted recovery under complicated multipath channel environment.
Description of drawings
Fig. 1 is digital transmission system frame structure schematic diagram;
Fig. 2 is the production method schematic diagram of P1 symbol in European DVB-T2;
Fig. 3 is the insertion method of P1 symbol in 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 in the present invention is that the OFDM data block of N and front protection interval thereof, rear protection interval forms by length; portability K signaling information group; can comprise 1 bit signalling information or many bit signallings information in each signaling information group, the essential information of subsequent demodulation such as signal frame FFT length, encoder bit rate and transmit diversity.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 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 be all 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 higher, and the length of relative known array is longer.
S2. modulated known array is carried out respectively preliminary treatment, obtain sequence S '
1, S '
2..., S '
MPreliminary treatment be differential coding and/randomization, the purpose of differential coding is to make receiver can complete 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 papr of time domain frame synchronizing sequence.S3. the known array after processing is mapped on N subcarrier, obtains block of frequency domain data X.The subcarrier mapping ruler is as follows: sequence S '
1, S '
2..., S '
MBe mapped to respectively one section continuous subcarrier as the interval to set number of sub-carriers respectively, between different sequences, the setting number of sub-carriers at institute interval represents respectively different signaling informations, and the weight of longer its represented signaling information group of length of setting number of sub-carriers is higher.
S4. block of frequency domain data X is carried out inverse discrete Fourier transform (Ineverse DiscreteFourier Transform, IDFT), obtain the time-domain data blocks x that length is N;
S5. protect interval, rear protection interval before time-domain data blocks x forward and backward inserts respectively, and be combined to form frame synchronization sequence with time-domain data blocks x.Front protection interval and rear protection interval produce by the rear setting section L sub-block B of time-domain data blocks x; front protection interval is identical with B; rear protection is spaced apart the product of B and twiddle factor; preferably; twiddle factor is-1; utilize so the correlation of front protection interval and rear protection interval and time-domain data blocks x, receiver can be completed 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 the quantity according to the signaling information group of need transmission, generate some groups of known arrays, and modulate respectively known array with different signaling information groups; Pretreatment module 2 is used for modulated known array is carried out respectively preliminary treatment; Subcarrier mapping block 3, the known array after being used for processing is mapped to some subcarriers, 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 interval insert module 5 is used for before time-domain data blocks forward and backward inserts respectively protection interval, rear protection interval, and obtains the frame synchronization sequence of final generation.
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 generates.The structure of the corresponding 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, choosing Δ d is 0,128,256 and 512, represents respectively 2 bit-binary data 00,01,10 and 11.If this signaling need to be carried more bit number, can further segment two distances between 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 present embodiment, frame synchronization sequence carries two groups of different signaling informations, i.e. K=2.Difference 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 to signaling information 1, S
3, S
4Relevant to signaling information 2.If the degree of priority of signaling information 1 higher than signaling information 2, is chosen S
1, S
2Length greater than S
3And S
4Length.After completing 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, large range difference will make Sequence Detection more reliable, detect the error rate lower like this.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes 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 (11)
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 respectively described known array with different signaling information groups;
S2. described modulated known array is carried out respectively preliminary treatment;
S3. the known array after processing is mapped on some subcarriers, 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. protect interval, rear protection interval before described time-domain data blocks forward and backward inserts respectively, obtain frame synchronization sequence;
Described known array is known binary sequence, described binary sequence is 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 be all different sequences, and sequence length is identical or different.
2. the frame synchronization sequence generation method of digital information transmission as claimed in claim 1, is characterized in that, the modulation system in 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, in step S3, the method of described mapping is that the known array after described processing is mapped to respectively one section continuous subcarrier to set number of sub-carriers as the interval, and described setting number of sub-carriers represents 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 higher, and the length of relative known array is longer.
5. the frame synchronization sequence generation method of digital information transmission as claimed in claim 3, is characterized in that, the weight of the longer represented signaling information group of the length of described setting number of sub-carriers is higher.
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; described front protection is spaced apart the rear setting cross-talk data block of described time-domain data blocks, and described rear protection is spaced apart the product of described rear setting cross-talk data block and twiddle factor.
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. 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 respectively described known array with different signaling information groups;
Pretreatment module is used for described modulated known array is carried out respectively preliminary treatment;
The subcarrier mapping block, the known array after being used for processing is mapped to some subcarriers, 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 interval insert module is used for protecting interval, rear protection interval before described time-domain data blocks forward and backward inserts respectively, obtain frame synchronization sequence;
Described known array is known binary sequence, described binary sequence is 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 be all different sequences, and sequence length is identical or different.
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| CN105874762A (en) * | 2014-10-29 | 2016-08-17 | 华为技术有限公司 | Method, apparatus and system for sending and receiving preamble sequence |
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| CN103078825B (en) * | 2013-01-30 | 2016-08-10 | 清华大学 | Frame synchronization sequence in digital communication system generates method and device |
| CN105991500B (en) * | 2015-02-12 | 2019-07-02 | 上海数字电视国家工程研究中心有限公司 | The method of reseptance and device of leading symbol |
| WO2015158293A1 (en) * | 2014-04-16 | 2015-10-22 | 上海数字电视国家工程研究中心有限公司 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| KR102062221B1 (en) | 2014-04-16 | 2020-02-11 | 상하이 내셔널 엔지니어링 리서치 센터 오브 디지털 텔레비전 컴퍼니, 리미티드 | Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses |
| CN106685880A (en) * | 2014-07-10 | 2017-05-17 | 上海数字电视国家工程研究中心有限公司 | Physical frame preamble symbol receiving and processing method |
| CN106685881A (en) * | 2014-12-10 | 2017-05-17 | 上海数字电视国家工程研究中心有限公司 | Precursor symbol generating method and receiving method |
| CN106850488A (en) * | 2015-02-12 | 2017-06-13 | 上海数字电视国家工程研究中心有限公司 | The reception device of leading symbol |
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