CN101710891B - Method and device for generating frame synchronization sequence in digital communication system - Google Patents
Method and device for generating frame synchronization sequence in digital communication system Download PDFInfo
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Abstract
The invention relates to a method and a device for generating a frame synchronization sequence in a digital communication system and belongs to the technical field of digital signal transmission. In order to improve the flexibility, effectiveness and reliability of signal transmission, the invention provides a method for generating the frame synchronization sequence, which comprises the following steps: according to a frame structure, generating a plurality of original sequences; distributing signal messages to each original sequence; modulating the original sequences to carry the signal messages to form a plurality of modulation sequences; combining the modulation sequences in a time domain to form the frame synchronization sequence; and sending a frame after the frame synchronization sequence is combined with data to be transmitted into the frame. For the frame synchronization sequence provided based on the technical scheme, a receiving end can simply and rapidly complete the capture of the frame synchronization sequence and the estimation of a received signal synchronization parameter, and completes the modulation and restoration of the signal message. The method has simple realization process, low complexity and high detection precision and can reliably restore the signal messages under a complex wireless transmission channel environment.
Description
Technical field
The invention belongs to digital signal transmission technique field, frame synchronization sequence produces in particularly a kind of digital communication system method and device.
Background technology
The problem that present wireless communication technology mainly solves is how in limited bandwidth, to improve transmission rate reliably; Comprise two kinds of main piece transmission technology: OFDM (OrthogonalFrequency Division Multiplexing; OFDM) and SC-FDE (Single-Carrier Frequency Domain Equalization, single carrier frequency domain equalization).Prior art can realize high rate data transmission in frequency selective fading channels, and implementation procedure is comparatively easy, has been widely used in the wireless communication systems such as WLAN, fixed wireless access, received terrestrial digital broadcasting at present.
The broadband wireless transmission must be in the face of the ISI (Inter SymbolInterference, intersymbol interference) of multipath effect introducing, i.e. frequency selective fading problem.For block transmission system; Though the duration of data block is far longer than the duration of single symbol; But under big time delay expansion passage, still there is the IBI (Inter Block Interference, inter-block-interference) that can not ignore between the time-domain data blocks.A kind of effective ways of block transmission system antagonism IBI are between time-domain data blocks, to add GI (Guard Interval in the prior art; Protection at interval); Be not less than in the length of GI under the situation of maximum multipath time-delay of passage, can not produce inter-block-interference between the time-domain data blocks.Variety classes according to GI filling content exists multiple GI filling technique, comprising CP (Cyclic Prefix; Cyclic Prefix) filling technique, ZP (Zero Padding, zero padding) technology; And TS (Training Sequence, training sequence) filling technique or the like.Wherein as shown in Figure 1 based on Cyclic Prefix filling ofdm system frame structure; Data block A2 is positioned at after the Cyclic Prefix section A1; Cyclic Prefix is as DFT (Discrete Fourier Transform; Discrete Fourier transform) protection at interval; This technology successful Application to IEEE 802.11a WLAN, digital audio broadcasting (DigitalAudio Broadcasting, DAB), (Digital VideoBroadcasting-Terrestrial is DVB-T) and in the accurate DVB-T2 of the second generation system in ground numerical digit video broadcasting; Based on PN (Pseudo-random Noise; Pseudo noise) method of sequence filling is the special case of TS filling technique, belongs to a key character of TDS-OFDM (Time Domain Synchronization OFDM, time-domain synchronization OFDM) system; Its frame structure is as shown in Figure 2; Data block B2 is positioned at after the training sequence B1, this technology successful Application to Chinese terrestrial DTV transmission standard (Digital Television Multimedia Broadcast, DTMB) in.
The physical layer signal frame structure is to the performance important influence of whole system; All there are different physical layer frame structures in above-mentioned these standards or system; Though but adopt which kind of physical layer frame structure, all can comprise frame synchronization sequence, command transmitting symbol and data symbol as the one of which.In the DVB-T2 system, the physical layer frame synchronizing sequence has adopted the P1 symbol.The P1 symbol is that 1024 the OFDM data block extended protection through frequency displacement on time domain is resultant by a segment length; Insertion position and the mode of P1 symbol in the DVB-T2 signal frame structure is as shown in Figure 3, and wherein C is the frequency displacement of the preceding part of A, and B is the latter part of frequency displacement of A; The P1 symbol is used as the initial synchronisation except the targeting sequencing as the T2 frame; Also carried the signaling information of 7 bits, comprised FFT length, SISO/MISO pattern of T2 signal frame etc., so that the follow-up signal demodulation.P2 is the signal of other signaling informations of transmission.Adopted the time-domain synchronization OFDM technology in the DTMB system, filled at interval as protection with time-domain training sequence.Known time-domain training sequence can also be assisted operations such as carrying out frame synchronization, regularly recovery, carrier wave recovery, channel estimating and Noise Estimation when the antagonism inter-block-interference plays the protection interval action.The DTMB system has also adopted the multi-frame structure of multilayer simultaneously, and as shown in Figure 4, the superiors of multi-frame structure are called a day frame, and it is the cycle with a consecutive days (24 hours), Greenwich Mean Time (GST) 0:0:0AM is defined as the time started of a new day frame.Each day, frame comprised 1440 branch frames, and each divides frame length is 1 minute.Divide following one deck of frame to be called superframe, each superframe continues 125ms.Superframe is made up of basic signal frame, and each signal frame has unique frame number, and it is coded in the PN sequence of signal frame frame head.
To having the digital-communications transmission system of signal frame structure, receiving terminal is at first accomplished catching of frame synchronization usually.Therefore, the frame synchronization reliability of catching is that receiver parameters is estimated and the basis of subsequent demodulation.In addition; Communication system is in order to satisfy the transmission demand under the different condition; Its system configuration parameter possesses the parameter of plurality of optional usually, for example data block length, protection gap length, number of sub carrier wave, modulation system, code rate and whether adopt transmit diversity etc.Therefore, receiving terminal need know or obtain the signaling information of relevant system configuration usually in advance, promptly transmission parameter signaling (Transmission Parameter Signaling, TPS).In order to make receiving terminal can obtain above-mentioned physical layer parameter sooner, more effectively, more reliably; Be necessary the production method of the frame synchronization sequence of transmitting terminal is improved; Make it carry the physical layer signaling information of some; So that receiver is accomplished signal frame synchronization acquistion apace, received signal Synchronization parameter Estimation (like Nonlinear Transformation in Frequency Offset Estimation, clock recovery estimation etc.), obtain corresponding signaling information simultaneously.
Summary of the invention
The object of the invention is to disclose a kind of based on frame synchronization sequence production method and device in the block transmission system of training sequence, to improve flexibility, validity and the reliability of signal transmission.
In order to achieve the above object, the invention provides the generation method of frame synchronization sequence in a kind of digital communication system, be used to generate the frame synchronization sequence that is combined, carried signaling information by the plurality of sections modulation sequence, said method comprises the steps:
Steps A:, generate plurality of original sequences according to frame structure;
Said original series comprises the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks; Perhaps, the discrete fourier transform domain of said original series is the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks; Step B: signaling information is assigned to said original series;
Step C: said original series is modulated, formed some modulation sequences that carry signaling information;
The modulation format of original series comprises changes in amplitude, phase change, time domain displacement, discrete fourier transform domain displacement, or the combination of aforesaid way;
Step D: said modulation sequence is combined to form said frame synchronization sequence on time domain.
Said frame structure in the said steps A adopts the transmission system have multi-frame structure and the multi-frame frame head is arranged, has multi-frame structure but do not have the transmission system of multi-frame frame head or do not have the transmission system of multi-frame structure.
The total length of said plurality of original sequences is by the frame structure decision of correspondence.
In said step B, according to the significance level of signaling information the signaling information bit is provided with the weight of different stage, to distinguish its protected degree.
In said step C, the modulation condition of original series has two kinds at least, and the bit number of the signaling information that corresponding modulation sequence carries is not less than one.
In said step D, the combined method of modulation sequence is determined by frame structure, comprises that the continuous combination of time domain is inserted plurality of data piece front as the superframe head or the time domain dispersed combination is inserted between data block as protection at interval.
Behind said step D, with said frame synchronization sequence and data to be transmitted framing and together transmission, said data to be transmitted is OFDM modulation or single-carrier modulated data.
In addition, the generating apparatus of frame synchronization sequence in a kind of digital communication system comprises original series generation module, signaling information distribution module, original series modulation module and modulation sequence composite module, wherein,
The original series generation module is used for according to frame structure, produces some original series, and its result sends to the signaling information distribution module;
The signaling information distribution module is used for signaling information is assigned to said original series, and its result sends to the original series modulation module;
The original series modulation module; Be used for original series being modulated through the operations such as combination of changes in amplitude, phse conversion, time domain displacement, discrete fourier transform domain frequency displacement or above-mentioned modulation system; Form some modulation sequences that carry signaling information, and send it to the modulation sequence composite module;
The modulation sequence composite module is used for said modulation sequence is combined to form said frame synchronization sequence in time domain.
Based on the frame synchronization sequence that technical scheme of the present invention proposed; Receiving terminal can utilize cross-correlation or the autocorrelative detection method of sliding is accomplished the catching and the estimation of synchronization parameter to received signal of frame synchronization sequence quickly and easily, and the demodulation that utilizes frame synchronization sequence to accomplish signaling information recovers.This method implementation procedure step is simple, complexity is low, accuracy of detection is high, and can under the wireless transfer channel environment of complicacy, recover the signaling information that carries reliably.
Description of drawings
Fig. 1 is a kind of sketch map of CP-OFDM frame structure in the prior art
Fig. 2 is a kind of sketch map of TDS-OFDM frame structure in the prior art;
Fig. 3 is P1 symbol insertion position and a mode sketch map in the European DVB-T2 system signal frame structure in the prior art;
Fig. 4 is the stratification frame structure sketch map of Chinese DTMB system in the prior art;
Fig. 5 is the frame synchronization sequence production method flow chart according to the embodiment of the invention;
Fig. 6 is the structure and the fill method sketch map of frame synchronization sequence in the embodiment of the invention one;
Fig. 7 is the structure and the fill method sketch map of frame synchronization sequence in the embodiment of the invention two;
Fig. 8 is the structure and the fill method sketch map of frame synchronization sequence in the embodiment of the invention three;
Fig. 9 is the structure and the fill method sketch map of frame synchronization sequence in the embodiment of the invention four;
Figure 10 is the structure and the fill method sketch map of frame synchronization sequence in the embodiment of the invention five;
Figure 11 is the structure and the fill method sketch map of frame synchronization sequence in the embodiment of the invention six.
Figure 12 is the structural representation of frame synchronization sequence generation device in the embodiment of the invention seven.
Embodiment
For making the object of the invention, content and advantage clearer, below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
At first to provided by the present invention in a kind of digital communication system the generation method of frame synchronization sequence describe.
This method is used to generate the frame synchronization sequence that is combined, carried signaling information by the plurality of sections modulation sequence, comprises the steps:
Steps A:, generate plurality of original sequences according to frame structure;
Said frame structure adopts the transmission system have multi-frame structure and the multi-frame frame head is arranged, has multi-frame structure but do not have the transmission system of multi-frame frame head or do not have the transmission system of multi-frame structure.
Said original series is the binary sequence of time domain, the perhaps binary sequence of discrete fourier transform domain, and the total length of said plurality of original sequences is by the frame structure decision of correspondence.
The binary sequence of said time domain comprises the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks; The binary sequence of said discrete fourier transform domain comprises that the discrete fourier transform domain of original series is the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks.
Step B: signaling information is assigned to said original series, according to the significance level of signaling information the signaling information bit is provided with the weight of different stage, to distinguish its protected degree;
Step C: said original series is modulated; Form some modulation sequences that carry signaling information; The modulation condition of original series has two kinds at least; The bit number of the signaling information that corresponding modulation sequence carries is not less than one, and the modulation format of original series comprises changes in amplitude, phase change, time domain displacement, discrete fourier transform domain displacement, or the combination of aforesaid way;
Step D: said modulation sequence is combined to form said frame synchronization sequence on time domain; The combined method of modulation sequence is determined by frame structure, comprises that the continuous combination of time domain is inserted plurality of data piece front as the superframe head or the time domain dispersed combination is inserted between data block as protection at interval; In addition, also said frame synchronization sequence is inserted data to be transmitted and together transmission, said data to be transmitted is OFDM modulation or single-carrier modulated data.
Some embodiments of technical scheme of the present invention are described according to specific embodiment below.
Embodiment 1
As shown in Figure 5, present embodiment specifically describes one to have multi-frame structure and fills the workflow that protection ofdm system at interval produces frame synchronization sequence based on training sequence.The structure of frame synchronization sequence and fill method are as shown in Figure 6 in the present embodiment.
In said ofdm system, training sequence that protection is filled at interval and OFDM data block are formed a signal frame, and the training sequence of filling between data block is made up of two in the present embodiment continuous original series C.The process that frame synchronization sequence produces specifically comprises the steps:
Step 101:, produce 4 original series C according to frame structure;
4 original series are the sequence of length 256, and the discrete fourier transform domain of this sequence is the m sequence of length 255, and the length that the process cyclic extensions obtains is 256 sequence.
Step 102: signaling information is assigned to said each original series
The signaling of this system transmissions comprises 6 bit informations, comprises protection gap length 2 bits, FFT length 2 bits, whether adopts transmit diversity 1 bit, and keep 1 bit information; Whether correspondence is protected interval, FFT length, adopted transmit diversity, the pairing signaling information of reservation information to distribute to four original series successively.
Step 103: original series is modulated to carry signaling information, formed some modulation sequences;
Utilize the training sequence cyclic shift to carry signaling information in the present embodiment, modulation sequence C1, C2, C3, C4 are the cyclic shifts of original series C, and length is the training sequence C=[c of N
1, c
2..., c
N] one of ring shift right is:
Similarly, ring shift right L position is:
Ring shift left L position is:
As preferably; Choose
etc., wherein
expression is no more than the maximum integer of x.To choose L be-7 to carrying 2 bit information original series in the present embodiment ,-3 ,+3 ,+7; To choose L be-3 to carrying 1 bit information original series ,+3.Because a modulation sequence carries the protected degree of 2 bit informations and obviously is lower than the 1 bit information situation of carrying, therefore give the modulation sequence that only carries 1 bit information with high weight information Bit Allocation in Discrete.
Step 104: said 4 modulation sequences are combined to form said frame synchronization sequence continuously in time domain, insert S signal frame front (wherein S is an integer) as the superframe head, and send after together forming a superframe.
Receiving terminal carries signaling information through the change in displacement that detects frame each synchronizing sequence itself with demodulation.
Embodiment 2
Present embodiment specifically describes one to have multi-frame structure and fills the workflow that protection ofdm system at interval produces frame synchronization sequence based on training sequence.The structure of frame synchronization sequence and fill method are as shown in Figure 7 in the present embodiment.
In said ofdm system, training sequence that protection is filled at interval and OFDM data block are formed a signal frame, and the training sequence of filling between data block is the original series in the present embodiment.The process that frame synchronization sequence produces specifically comprises the steps:
Step 201:, produce 1 original series according to frame structure;
This original series is that length is 191 time domain Legendre sequence.
Step 202: signaling information is assigned to said each original series;
This system transmissions 1 bit signalling information is distributed to this original series.
Step 203: original series is modulated to carry signaling information, formed some modulation sequences;
Utilize the training sequence phase change to carry signaling information in the present embodiment, modulation sequence C1 is the phase change of original series C, training sequence C=[c
1, c
2..., c
N] phase shift is:
Step 204: said modulation sequence is said frame synchronization sequence, inserts S signal frame front (wherein S is an integer) as the superframe head, and sends after together forming a superframe.
Receiving terminal carries signaling information through the phase change that detects each frame synchronization sequence itself with demodulation.
Embodiment 3
Present embodiment specifically describes one to have multi-frame structure and fills the workflow that protection single-carrier system at interval produces frame synchronization sequence based on training sequence.The structure of frame synchronization sequence and fill method are as shown in Figure 8 in the present embodiment.
In said single-carrier system, training sequence that protection is filled at interval and single carrier data block are formed a signal frame, and the training sequence of filling between data block is first original series in the present embodiment.The process that frame synchronization sequence produces specifically comprises the steps:
Step 301:, produce 2 original series according to frame structure;
This original series is that the length that different generator polynomials produce is 127 m sequence, is designated as C and C ' respectively.
Step 302: signaling information is assigned to said each original series;
These system transmissions 2 bit signalling information, each original series respectively distributes 1 bit information.
Step 303: original series is changed to carry signaling information, form some modulation sequences;
Utilize the discrete fourier transform domain change in displacement of training sequence to carry signaling information in the present embodiment, modulation sequence C1, C2 are the discrete Fourier transform territory change in displacement of original series C, C ', training sequence C=[c
1, c
2..., c
N] discrete fourier transform domain displacement equivalence is the time domain frequency displacement, that is:
Step 304: said 2 modulation sequences are combined to form said frame synchronization sequence continuously in time domain, insert S signal frame front (wherein S is an integer) as the superframe head, and send after together forming a superframe.
Receiving terminal carries signaling information through the discrete fourier transform domain displacement that detects each frame synchronization sequence itself with demodulation.
Embodiment 4
Present embodiment specifically describes one to have multi-frame structure and fills the workflow that protection single-carrier system at interval produces frame synchronization sequence based on training sequence.The structure of frame synchronization sequence and fill method are as shown in Figure 9 in the present embodiment.
In said single-carrier system, training sequence that protection is filled at interval and single carrier data block are formed a signal frame, and the training sequence of filling between data block is the original series in the present embodiment.The process that frame synchronization sequence produces specifically comprises the steps:
Step 401:, produce 3 original series according to frame structure;
This original series all is that length is 512 sequence, and the discrete fourier transform domain of this sequence is the Walsh sequence of length 512.
Step 402: signaling information is assigned to said each original series;
These system transmissions 3 bit signalling information, each original series respectively distributes 1 bit information.
Step 403: original series is changed to carry signaling information, form some modulation sequences;
Utilize the training sequence changes in amplitude to carry signaling information in the present embodiment, modulation sequence C1, C2, C3 are the changes in amplitude of original series C, training sequence C=[c
1, c
2..., c
N] changes in amplitude is:
wherein a is changes in amplitude, and A is the changes in amplitude operand.As preferably, choose
Deng.Choose a in the present embodiment and be 1 with
Step 404: said 3 modulation sequences are combined to form said frame synchronization sequence continuously in time domain, insert S signal frame front (wherein S is an integer) as the superframe head, and send after together forming a superframe.
Receiving terminal carries signaling information through the changes in amplitude that detects each frame synchronization sequence itself with demodulation.
Embodiment 5
Present embodiment specifically describes one to have multi-frame structure and fills the workflow that protection single-carrier system at interval produces frame synchronization sequence based on training sequence.The structure of frame synchronization sequence and fill method are shown in figure 10 in the present embodiment.
In said single-carrier system, training sequence that protection is filled at interval and single carrier data block are formed a signal frame, and the training sequence of filling between data block is the original series in the present embodiment.The process that frame synchronization sequence produces specifically comprises the steps:
Step 501:, produce 2 original series according to frame structure;
Original series is that length is respectively 256 and 512 Golay sequence, is designated as C and C ' respectively.
Step 502: signaling information is assigned to said each original series;
These system transmissions 8 bit signalling information, each original series respectively distributes 4 bit informations.The longer Sequence Detection probability of success obviously is higher than shorter sequence, therefore is 512 original series to length with high weight information Bit Allocation in Discrete.
Step 503: original series is changed to carry signaling information, form some modulation sequences;
Utilize the combination of training sequence phase change, changes in amplitude, time domain displacement and discrete fourier transform domain displacement to carry signaling information in the present embodiment; Modulation sequence C1, C2 are the combination and variation of original series C, C ', training sequence C=[c (1), c (2);, c (n)] combination and variation be:
Wherein Δ is the combination and variation operand.Choosing L in the present embodiment is-3 ,+3; Choose
and be 0 and π; Choose ω and be 0 and 2 π/N; Choose a and be 1 with
and respectively carry 1 bit information.
Step 504: said 2 modulation sequences are combined to form said frame synchronization sequence continuously in time domain, insert S signal frame front (wherein S is an integer) as the superframe head, and send after together forming a superframe.
Receiving terminal carries signaling information through the changes in amplitude, phase change, time domain displacement, the discrete fourier transform domain displacement that detect each frame synchronization sequence itself with demodulation.
Embodiment 6
Present embodiment specifically describes a workflow based on training sequence filling protection ofdm system generation frame synchronization sequence at interval that has multi-frame structure but do not have the multi-frame head.The structure of frame synchronization sequence and fill method are shown in figure 11 in the present embodiment.
In said ofdm system, training sequence that protection is filled at interval and OFDM data block are formed a signal frame, and the training sequence of filling between data block is the modulation sequence after the original series process conversion in the present embodiment.The process that frame synchronization sequence produces specifically comprises the steps:
Step 601:, produce 225 original series according to frame structure
Original series is to be 420 sequences by the m sequence of length 255 through obtaining length after the cyclic extensions.
Step 602: signaling information is assigned to said each original series;
These system transmissions 224 bit signalling information, first original series does not carry information, and all the other each original series respectively distribute 1 bit information.
Step 603: original series is changed to carry signaling information, form some modulation sequences;
Utilize the training sequence cyclic shift to carry signaling information in the present embodiment, modulation sequence C1, C2 ..., Cs is that the cyclic shift of original series C changes, wherein first sequence L is chosen for 0; All the other 224 sequences respectively have 2 sequence L be chosen for ± 1; Or ± 3 ..., or ± 113.
Step 604: said 225 modulation sequences are inserted in 225 signal frames as protection in the time domain dispersed combination at interval, and send after together forming a superframe.
Receiving terminal carries signaling information through the time domain change in displacement that detects frame each synchronizing sequence itself with demodulation.
Based on the frame synchronization sequence that is proposed among the technical scheme embodiment 1～6 of the present invention; Receiving terminal can be accomplished the catching and the estimation of synchronization parameter (like frequency departure, timing error, frame synchronization sequence original position etc.) to received signal of frame synchronization sequence through modulation sequence quickly and easily, and accomplishes the demodulation that modulation sequence is carried signaling information and recover.For example, utilize the modulation sequence displacement to carry out demodulation among the embodiment 1 and 6; Utilize the modulation sequence phase place to carry out demodulation among the embodiment 2; Utilize the modulation sequence frequency deviation to carry out demodulation among the embodiment 3; Utilize the modulation sequence amplitude to carry out demodulation among the embodiment 4; Unite among the embodiment 5 and utilize modulation sequence displacement, phase place, frequency, amplitude displacement demodulation.This method receiving terminal implementation procedure is simple, complexity is low, accuracy of detection is high, can under complicated wireless transfer channel environment, reliably recover signaling information.
Embodiment 7
Present embodiment specifically describes the generating apparatus that technical scheme of the present invention has proposed frame synchronization sequence in a kind of digital communication system; Comprise original series generation module, signaling information distribution module, original series modulation module and modulation sequence composite module; Shown in figure 12, wherein
The original series generation module: be used for according to frame structure, produce some original series, its result sends to the signaling information distribution module;
The signaling information distribution module: be used for signaling information is assigned to said original series, its result sends to the original series modulation module;
Original series modulation module: be used for through changes in amplitude, phse conversion, time domain displacement, discrete fourier transform domain frequency displacement; Or operation such as its combination is modulated original series; Form some modulation sequences that carry signaling information, and send it to the modulation sequence composite module
Modulation sequence composite module: be used for said modulation sequence is combined to form said frame synchronization sequence in time domain.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and distortion, these improvement and distortion also should be regarded as protection scope of the present invention.
Claims (8)
1. the generation method of frame synchronization sequence in the digital communication system is characterized in that said method is used to generate the frame synchronization sequence that is combined, carried signaling information by the plurality of sections modulation sequence, and said method comprises the steps:
Steps A:, generate plurality of original sequences according to frame structure; Said original series comprises the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks; Perhaps, the discrete fourier transform domain of said original series is the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks;
Step B: signaling information is assigned to said original series;
Step C: said original series is modulated, formed some modulation sequences that carry signaling information; The modulation format of original series comprises changes in amplitude, phase change, time domain displacement, discrete fourier transform domain displacement, or the combination of aforesaid way;
Step D: said modulation sequence is combined to form said frame synchronization sequence on time domain.
2. the generation method of frame synchronization sequence as claimed in claim 1; It is characterized in that; Said frame structure in the said steps A adopts the transmission system have multi-frame structure and the multi-frame frame head is arranged, has multi-frame structure but do not have the transmission system of multi-frame frame head or do not have the transmission system of multi-frame structure.
3. the method that produces like each described frame synchronization sequence among the claim 1-2 is characterized in that, the total length of said plurality of original sequences is by the frame structure decision of correspondence.
4. like the generation method of each described frame synchronization sequence among the claim 1-2, it is characterized in that, in said step B, according to the significance level of signaling information the signaling information bit is provided with the weight of different stage, to distinguish its protected degree.
5. like the generation method of each described frame synchronization sequence among the claim 1-2, it is characterized in that in said step C, the modulation condition of original series has two kinds at least, the bit number of the signaling information that corresponding modulation sequence carries is not less than one.
6. like the generation method of each described frame synchronization sequence among the claim 1-2; It is characterized in that; In said step D; The combined method of modulation sequence is determined by frame structure, comprises that the continuous combination of time domain is inserted plurality of data piece front as the superframe head or the time domain dispersed combination is inserted between data block as protection at interval.
7. like the generation method of each described frame synchronization sequence among the claim 1-2; It is characterized in that; Behind said step D, with said frame synchronization sequence and data to be transmitted framing and together transmission, said data to be transmitted is OFDM modulation or single-carrier modulated data.
8. the generating apparatus of frame synchronization sequence in the digital communication system is characterized in that said device comprises original series generation module, signaling information distribution module, original series modulation module and modulation sequence composite module, wherein,
The original series generation module is used for according to frame structure, produces some original series, and its result sends to the signaling information distribution module; Said original series comprises the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks; Perhaps, the discrete fourier transform domain of said original series is the cyclic extensions of m sequence, Gold sequence, Legendre sequence, Walsh sequence, Golay sequence or above-mentioned sequence or blocks;
The signaling information distribution module is used for signaling information is assigned to said original series, and its result sends to the original series modulation module;
The original series modulation module; Be used for original series being modulated through the operations such as combination of changes in amplitude, phse conversion, time domain displacement, discrete fourier transform domain frequency displacement or above-mentioned modulation system; Form some modulation sequences that carry signaling information, and send it to the modulation sequence composite module;
The modulation sequence composite module is used for said modulation sequence is combined to form said frame synchronization sequence in time domain.
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| CN102761513A (en) * | 2012-07-16 | 2012-10-31 | 清华大学 | Method and device for supporting real-time multi-service in OFDM (Orthogonal Frequency Division Multiplexing) communication system |
| CN103532573B (en) * | 2013-08-16 | 2015-09-23 | 上海数字电视国家工程研究中心有限公司 | Digital signal transmission method and device |
| CN105281883B (en) | 2014-06-30 | 2019-07-09 | 深圳市中兴微电子技术有限公司 | Multi-channel synchronization method, synchronizing device and system |
| CN106534896B (en) * | 2016-11-25 | 2019-06-18 | 北京数码视讯科技股份有限公司 | A kind of transmission method and device of transport stream TS |
| WO2018142206A1 (en) * | 2017-02-06 | 2018-08-09 | Telefonaktiebolaget Lm Ericsson (Publ | Combining synchronization sequences of different lengths |
| CN110149171B (en) * | 2019-06-25 | 2022-04-26 | 昆腾微电子股份有限公司 | Wireless audio data sending method, receiving method and device |
| CN111314261B (en) * | 2020-02-24 | 2022-08-16 | 中国人民解放军国防科技大学 | Centralized plug-in frame synchronization rapid blind identification method |
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2009
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Non-Patent Citations (1)
| Title |
|---|
| 杨昉 等.TDS-OFDM系统的训练序列设计.《清华大学学报(自然科学版)》.2009,第49卷(第7期),第991-993页. * |
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| CN101710891A (en) | 2010-05-19 |
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