CN101188592A - Synchronization method and system for multi-carrier system - Google Patents
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Abstract
The invention relates to a synchronous method used for a multi-carrier wave system. The method comprises the steps that a multiplexed data frame with multiple sequence as the synchronizing symbol is received, and the data part and the synchronization part corresponding to the synchronizing symbol are demultiplexed from the data frame; the synchronization part is calculated to obtain the estimated initial position and the estimated frequency deviation value of fast Fourier transformation; timed compensation and frequency deviation compensation are performed to the data part according to the estimated initial position and the estimated frequency deviation value. The invention also relates to a synchronous system used for the multi-carrier system. The synchronous system comprises a frame receiving module, a demultiplexing module, an initial position calculation module, a frequency deviation calculation module, a timed compensation module and a frequency deviation compensation module. In the invention, timed estimation and frequency deviation estimation are performed with the multiple sequence as the synchronizing symbol, the perfect characters of the multiple sequence is utilized; therefore not only the accuracy of the timed estimation and the frequency deviation estimation are improved, but also the algorithm is simple, the operation complexity is low, and good synchronous effect is achieved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of sign synchronization of multicarrier system and method and system of carrier synchronization of being applicable to.
Background technology
Along with development of wireless communication devices, multi-transceiver technology (especially orthogonal frequency division multiplexi) with its high spectrum utilization, effectively to anti-multipath etc. characteristics not only obtained using widely in broadcast type digital audio and video field, and be introduced in the standard of WLAN (wireless local area network) and wireless MAN.At third generation partner program (3rd GenerationPartnership Project, abbreviation 3GPP) Long Term Evolution (the Long TermEvolution that starts, abbreviation LTE) in the research, OFDM (Orthogonal FrequencyDivision Multiplexing is called for short OFDM) technology has been adopted as descending multi-access mode.
The synchronizing process of multicarrier system comprises sign synchronization and carrier synchronization.Guarantee fast fourier transform (Fast Fourier Transformation by sign synchronization, be called for short FFT) and invert fast fourier transformation (Inverse FFT, abbreviation IFFT) zero-time unanimity, sign synchronization is as the first step operation of system receiving terminal, and the precision of its timing estimation has very big influence to the multicarrier system performance.The frequency of oscillation that carrier synchronization guarantees receiving terminal with send carrier wave with homophase frequently because multicarrier system itself is to frequency deviation sensitivity very, this just requires to make frequency deviation estimates accurately and compensates.
Simultaneous techniques for multicarrier system, traditional synchronized algorithm based on training sequence adopts pseudo random sequence (PN sequence) more, this synchronization scenario based on the PN sequence needs local training sequence auxiliary to realize synchronously usually, improve the complexity of algorithm, also limited further developing of synchronous research.
Summary of the invention
The objective of the invention is to propose a kind of method for synchronous and system that is used for multicarrier system, can realize good timing accuracy and frequency offset estimating accuracy, reduce the phase mutual interference of interchannel not needing local training sequence down auxiliary.
For achieving the above object, the invention provides a kind of method for synchronous that is used for multicarrier system, comprising:
Receiving multiplexing with multinomial sequence is the Frame of synchronizing symbol, and demultiplexing goes out data division and corresponding to the sync section of described synchronizing symbol from this Frame;
Described sync section is calculated, obtain the estimated initial position and the frequency offset estimating value of fast fourier transform;
Respectively described data division is carried out timing compensation and compensate of frequency deviation according to described estimated initial position and frequency offset estimating value.
In technique scheme, adopt multinomial sequence as synchronizing symbol, multiphase sequence has desirable autocorrelation performance, and not only peak-to-average power ratio (PAPR) value is little, autocorrelation performance good, be still multiphase sequence after the FFT conversion, also has centrosymmetric characteristics.Therefore adopt the technical program of multiphase sequence can realize powerful transmission requirement, and can more effectively estimate the original position of signal, realized better synchronous effect.
Further, multiplexing is that the operation of the Frame of synchronizing symbol can be specially with multinomial sequence:
Becoming positive integers same multiphase sequence doubly with two of repeating is synchronizing symbol, carries out multiplexingly with the data symbol of transmitting terminal, and the length of this multinomial sequence is half of described data symbol;
Symbol after multiplexing is carried out invert fast fourier transformation, and form Frame.
As interchangeable, multiplexing is that the operation of the Frame of synchronizing symbol can also be specially with multinomial sequence:
Data symbol to transmitting terminal carries out invert fast fourier transformation, and forms Frame;
Becoming positive integers same multiphase sequence doubly with two of repeating is synchronizing symbol, carries out multiplexingly with described Frame, and the length of this multinomial sequence is half of described data symbol.
Further, when described positive integer doubly greater than 1 the time, need before described sync section is calculated, execution separate weighted accordingly.
Further, described described sync section is calculated, obtaining the estimated initial position of fast fourier transform and the operation of frequency offset estimating value can specifically comprise:
Described sync section is carried out symmetrical correlation computations, obtain the first initial estimated position of described sync section according to the auto-correlation peak;
Sync section is compensated the sync section after obtaining regularly to compensate with the described first initial estimated position;
Sync section after the described timing compensation divided equally be front and rear, and described front and rear is carried out conjugate multiplication, obtain the result's of conjugate multiplication argument part;
Described argument partly is converted into the frequency offset estimating value of fractional part, and compensates sync section after the described timing compensation, obtain the sync section behind the compensate of frequency deviation according to the frequency offset estimating value of described fractional part;
Sync section behind the described compensate of frequency deviation is carried out fast fourier transform, the sync section after the acquisition conversion;
Sync section after the described conversion is carried out symmetrical correlation computations, obtain the frequency offset estimating value of integer part according to the auto-correlation peak;
According to the frequency offset estimating value of the described first initial estimated position, fractional part and the frequency offset estimating value of integer part, obtain described estimated initial position and frequency offset estimating value.
In technique scheme, can carry out symmetrical correlation computations to obtain the first initial estimated position of described sync section to all or part pointwise of described sync section, and can the first initial estimated position as the estimated initial position, the frequency offset estimating value of described fractional part and the frequency offset estimating value of integer part are carried out sum operation, and its sum operation result is as described frequency offset estimating value.
More excellent scheme is after the sync section after obtaining compensate of frequency deviation, before the fast fourier transform, can also may further comprise the steps:
Symmetrical correlation computations is carried out in sync section pointwise behind the described compensate of frequency deviation, obtain the second estimated initial position of described sync section according to the auto-correlation peak.At this moment, can be with the described second estimated initial position as described estimated initial position.
When the frequency offset estimating value of computes integer part, can carry out symmetrical correlation computations to the sync section pointwise after the described conversion, obtain the frequency offset estimating value of described integer part according to the auto-correlation peak; Symmetrical correlation computations is carried out in the sequence pointwise that can also partly constitute the odd number of the sync section after the described conversion, obtains the frequency offset estimating value of described integer part according to the auto-correlation peak.
Organized multiplexing after being the Frame of synchronizing symbol with multinomial sequence when receiving more, can the frequency offset estimating value of the integer part of each group will be calculated respectively, and carry out cascading judgement according to result to each group, obtain the frequency offset estimating value of court verdict as described integer part.Comprehensive judgement by many groups result is to obtain more accurate frequency offset estimating.
Described multiphase sequence is preferably normal amplitude zero autocorrelation sequence or generalized chirp sequence.
For achieving the above object, the invention provides a kind of synchro system that is used for multicarrier system, comprising:
The frame receiver module, being used to receive multiplexing with multinomial sequence is the Frame of synchronizing symbol;
Demultiplexing module is used for going out data division and corresponding to the sync section of described synchronizing symbol from this Frame demultiplexing;
The original position computing module is used for described sync section is calculated, and obtains the estimated initial position of fast fourier transform;
The frequency offset calculation module is used for described sync section is calculated, and obtains the frequency offset estimating value;
Regularly compensating module is used for according to described estimated initial position described data division being carried out the timing compensation;
The compensate of frequency deviation module is used for being worth described data division according to described frequency offset estimating and carries out compensate of frequency deviation.
In technique scheme, described synchronizing symbol can become positive integer same multiphase sequence doubly for two of repeating.
Further, described original position computing module can specifically comprise:
First start bit is put computing unit, is used for described sync section is carried out symmetrical correlation computations, obtains the first initial estimated position of described sync section according to the auto-correlation peak.
Further, described frequency offset calculation module can specifically comprise:
The first timing compensating unit is used for the described first initial estimated position sync section being compensated, the sync section after obtaining regularly to compensate;
Fractional part frequency offset calculation unit, be used for the sync section after the described timing compensation divided equally and be front and rear, and described front and rear carried out conjugate multiplication, and obtain the result's of conjugate multiplication argument part, described argument partly is converted into the frequency offset estimating value of fractional part;
The fractional part frequency offset compensation element is used for the sync section after frequency offset estimating value according to described fractional part compensates described timing compensation, obtains the sync section behind the compensate of frequency deviation;
Fast Fourier transform unit is used for the sync section behind the described compensate of frequency deviation is carried out fast fourier transform, the sync section after the acquisition conversion;
Integer part frequency offset calculation unit is used for the sync section after the described conversion is carried out symmetrical correlation computations, obtains the frequency offset estimating value of integer part according to the auto-correlation peak;
The frequency offset estimating value obtains the unit, is used for obtaining described frequency offset estimating value according to the frequency offset estimating value of described fractional part and the frequency offset estimating value of integer part.
Further, described original position computing module can also comprise:
The second original position computing unit, be used for after the sync section after obtaining compensate of frequency deviation, before the fast fourier transform, symmetrical correlation computations is carried out in the sync section pointwise behind the described compensate of frequency deviation, obtain the second estimated initial position of described sync section according to the auto-correlation peak.
Further, said system can also comprise the cascading judgement module, be used for having organized multiplexing after being the Frame of synchronizing symbol with multinomial sequence when receiving more, to calculate the frequency offset estimating value of the integer part of each group respectively, and carry out cascading judgement according to result to each group, obtain the frequency offset estimating value of court verdict as described integer part.
Described multiphase sequence is preferably normal amplitude zero autocorrelation sequence or generalized chirp sequence.
Based on technique scheme, the present invention carries out timing estimation and frequency offset estimating with multiphase sequence as synchronizing symbol, has utilized the good characteristic of multiphase sequence, not only improved the precision of timing and frequency offset estimating, and algorithm is simple, and the complexity of computing is low, has reached good synchronous effect.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is used for the schematic flow sheet of an embodiment of the method for synchronous of multicarrier system for the present invention.
Fig. 2 is the overall flow schematic diagram of Fig. 1 embodiment at transmitting terminal and receiving terminal.
Fig. 3 is the schematic flow sheet of the instantiation of Fig. 1 embodiment.
Fig. 4 is used for the structural representation of an embodiment of the synchro system of multicarrier system for the present invention.
Fig. 5 is used for the structural representation of another embodiment of the method for synchronous of multicarrier system for the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
At first multiphase sequence is introduced.Multiphase sequence promptly contains the sequence of a plurality of phase places, more and more obtains people's attention with its desirable autocorrelation performance.By to multiphase sequence, the research of for example normal amplitude zero autocorrelation sequence (CAZAC), generalized chirp sequence (GCL) etc., find it not only peak-to-average power ratio (PAPR) value is little, autocorrelation performance good, be still multiphase sequence after the FFT conversion, also have centrosymmetric characteristics.
The average degree of the power of PAPR value representation signal wherein, value is more little to be approached on average more, and this can reduce the requirement to the dynamic range of power amplifier of transmitting terminal and receiving terminal, thereby realizes more powerful transmission requirement.Sending signal and adopt centrosymmetric structure, can be receiving terminal more effective signal original position that estimates when detecting, and improves thick synchronous reliability.Adopt the method for synchronous of multiphase sequence no longer to need the computation assistance of local sequence just can finish regularly and the estimation of frequency deviation, therefore reduced the complexity of receiver.
As shown in Figure 1, the schematic flow sheet of an embodiment that is used for the method for synchronous of multicarrier system for the present invention, synchronizing process is mainly finished at receiving terminal, but need carry out multiphase sequence and modulated data sequence multiplexing at transmitting terminal, finally obtaining multiplexing with multinomial sequence is the Frame of synchronizing symbol, and the synchronous flow process of receiving terminal specifically comprises:
Next send to having comprised transmitting terminal that receiving terminal receives synchronous whole process and synchronous idiographic flow describes by Fig. 2 and Fig. 3.In transmitting terminal one side, synchronizing symbol can be before IFFT carries out multiplexingly with modulated data symbol, also can carry out multiplexing with Frame after IFFT.The multiphase sequence that constitutes synchronizing symbol preferably adopts CAZAC sequence and GCL sequence, the synchronizing symbol x (k) of time domain can be made of the two sections identical repetition of CAZAC sequences or weightings, the CAZAC sequence length is N/2, N is the length of a modulated data symbol (for example OFDM symbol), is X (n) corresponding to the synchronizing symbol of the frequency domain of x (k).Wherein weighting represents to have between two sections CAZAC sequences positive integer relation doubly, if multiple greater than 1, then need execution be separated weighted accordingly before receiving terminal calculates sync section.
When transmitting terminal when channel has sent the Frame of synchronizing symbol x (k) multiplexing, receiving terminal receives this Frame, and this Frame is carried out demultiplexing, solves two parts, a part is the data division y corresponding to modulated data symbol
0(k), a part is the sync section r corresponding to synchronizing symbol
0(k), sync section r
0(k) as the basis (step 201) of timing estimation and frequency offset estimating.
In the step 202, receiving terminal is with r
0(k) bring following formula into:
Will
With
As the first initial estimated position, promptly thick timing value is to r
0(k) carry out the timing compensation, obtain
In step 204, with
The following formula of substitution:
β is updated to
Try to achieve the frequency offset estimating value ε of fractional part
Fraction, span is (1,1) subcarrier spacing;
In the step 203, according to the frequency offset estimating value ε of fractional part
FractionValue is to r
1(k) compensate the sync section r that obtains after the compensation
2(k);
The thick timing value that obtains in step 202 can also can obtain the more accurate second estimated initial position by step 205 directly as the basis of timing estimation, i.e. timing estimation value carefully further improves the precision of timing estimation.
In the step 205, with reference to 1 couple of r of formula
1(k) carry out symmetrical related operation, obtain the second estimated initial position
In the step 206, to the sync section r behind the process fractional part compensate of frequency deviation
2(k) carry out the FFT conversion, obtain the sync section R (n) of frequency domain;
R (n) after step 207, the process FFT conversion has good autocorrelation performance and centrosymmetric characteristic, finds the solution the integer part frequency deviation value herein and can adopt two kinds of methods:
A) R (n) directly is updated to formula:
In, obtain the m that makes θ (m) maximum, and will
As integer frequency bias estimated value q;
B) the odd number part (being the nonzero value part) of getting R (n) constitutes sequence
, will
The following formula of substitution:
In, obtain the m that makes (m) maximum, and will
As integer frequency bias estimated value q, thereby according to formula
ε＝ε
fraction+q (8)
Obtain frequency offset estimating value ε, its scope be (
) subcarrier spacing;
Obtaining the estimated initial position
With frequency offset estimating value ε, by step 208 and step 209 couple y
0(k) carry out timing compensation and compensate of frequency deviation, the y after the acquisition synchronously
1(k).
Based on above inventive concept, synchronizing process can also be expanded to receive many groups multiplexing be the situation of the Frame of synchronizing symbol with multinomial sequence, need to calculate respectively the frequency offset estimating value of the integer part of each group this moment, and carry out cascading judgement according to result to each group, obtain the frequency offset estimating value of court verdict as described integer part.Cascading judgement can adopt modes such as asking arithmetic equal value or geometric mean.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
As shown in Figure 4, the structural representation of an embodiment that is used for the synchro system of multicarrier system for the present invention.The system of present embodiment comprises: frame receiver module 1, demultiplexing module 2, original position computing module 3, frequency offset calculation module 4, timing compensating module 5 and compensate of frequency deviation module 6.
It is the Frame of synchronizing symbol that frame receiver module 1 has been used to receive multiplexing with multinomial sequence; Demultiplexing module 2 is used for going out data division and corresponding to the sync section of described synchronizing symbol from this Frame demultiplexing; Original position computing module 3 is used for described sync section is calculated, and obtains the estimated initial position of fast fourier transform; Frequency offset calculation module 4 is used for described sync section is calculated, and obtains the frequency offset estimating value; Regularly compensating module 5 is used for according to described estimated initial position described data division being carried out the timing compensation; Compensate of frequency deviation module 6 is used for being worth described data division according to described frequency offset estimating and carries out compensate of frequency deviation.
The synchronizing symbol that is adopted in the present embodiment becomes positive integer same multiphase sequence doubly, wherein preferred CAZAC sequence of multiphase sequence and GCL sequence etc. for two of repeating.
As shown in Figure 5, the structural representation of another embodiment that is used for the method for synchronous of multicarrier system for the present invention.Compare with a last embodiment, the original position computing module 3 of present embodiment comprises that specifically first start bit puts computing unit 31, this unit is used for described sync section is carried out symmetrical correlation computations, obtains the first initial estimated position of described sync section according to the auto-correlation peak.
In the present embodiment, frequency offset calculation module 4 can specifically comprise: the first timing compensating unit 41, fractional part frequency offset calculation unit 42, fractional part frequency offset compensation element 43, fast Fourier transform unit 44, integer part frequency offset calculation unit 45 and frequency offset estimating value obtain unit 46.
The first timing compensating unit 41 is used for the described first initial estimated position sync section being compensated, the sync section after obtaining regularly to compensate; Fractional part frequency offset calculation unit 42 is used for the sync section after the described timing compensation divided equally and is front and rear, and described front and rear carried out conjugate multiplication, obtain the result's of conjugate multiplication argument part, described argument partly is converted into the frequency offset estimating value of fractional part.
Fractional part frequency offset compensation element 43 is used for the sync section after frequency offset estimating value according to described fractional part compensates described timing compensation, obtains the sync section behind the compensate of frequency deviation; Fast Fourier transform unit 44 is used for the sync section behind the described compensate of frequency deviation is carried out fast fourier transform, the sync section after the acquisition conversion; Integer part frequency offset calculation unit 45 is used for the sync section after the described conversion is carried out symmetrical correlation computations, obtains the frequency offset estimating value of integer part according to the auto-correlation peak; The frequency offset estimating value obtains unit 46, is used for obtaining described frequency offset estimating value according to the frequency offset estimating value of described fractional part and the frequency offset estimating value of integer part.
In order to obtain more accurate timing estimation, can also increase by the second original position computing unit 32 at original position computing module 3, this unit is used for after the sync section after obtaining compensate of frequency deviation, before the fast fourier transform, symmetrical correlation computations is carried out in sync section pointwise behind the described compensate of frequency deviation, obtain the second estimated initial position of described sync section according to the auto-correlation peak.
In above-mentioned two system embodiments, can also comprise the cascading judgement module, can organize multiplexing after being the Frame of synchronizing symbol with multinomial sequence in reception more, to calculate the frequency offset estimating value of the integer part of each group respectively, and carry out cascading judgement according to result to each group, obtain the frequency offset estimating value of court verdict as described integer part.
The present invention carries out timing estimation and frequency offset estimating with multiphase sequence as synchronizing symbol, has utilized the good characteristic of multiphase sequence, not only improved regularly and the precision of frequency offset estimating, and algorithm is simple, and the complexity of computing is low, has reached good synchronous effect.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (20)
1. method for synchronous that is used for multicarrier system comprises:
Receiving multiplexing with multinomial sequence is the Frame of synchronizing symbol, and demultiplexing goes out data division and corresponding to the sync section of described synchronizing symbol from this Frame;
Described sync section is calculated, obtain the estimated initial position and the frequency offset estimating value of fast fourier transform;
Respectively described data division is carried out timing compensation and compensate of frequency deviation according to described estimated initial position and frequency offset estimating value.
2. method for synchronous according to claim 1, wherein multiplexing is that the operation of the Frame of synchronizing symbol is specially with multinomial sequence:
Becoming positive integers same multiphase sequence doubly with two of repeating is synchronizing symbol, carries out multiplexingly with the data symbol of transmitting terminal, and the length of this multinomial sequence is half of described data symbol;
Symbol after multiplexing is carried out invert fast fourier transformation, and form Frame.
3. method for synchronous according to claim 1, wherein multiplexing is that the operation of the Frame of synchronizing symbol is specially with multinomial sequence:
Data symbol to transmitting terminal carries out invert fast fourier transformation, and forms Frame;
Becoming positive integers same multiphase sequence doubly with two of repeating is synchronizing symbol, carries out multiplexingly with described Frame, and the length of this multinomial sequence is half of described data symbol.
4. according to claim 2 or 3 described method for synchronous, wherein when described positive integer doubly greater than 1 the time, weighted is separated in execution accordingly before described sync section is calculated.
5. according to claim 2 or 3 described method for synchronous, wherein said described sync section is calculated, obtain the estimated initial position of fast fourier transform and the operation of frequency offset estimating value and specifically comprise:
Described sync section is carried out symmetrical correlation computations, obtain the first initial estimated position of described sync section according to the auto-correlation peak;
Sync section is compensated the sync section after obtaining regularly to compensate with the described first initial estimated position;
Sync section after the described timing compensation divided equally be front and rear, and described front and rear is carried out conjugate multiplication, obtain the result's of conjugate multiplication argument part;
Described argument partly is converted into the frequency offset estimating value of fractional part, and compensates sync section after the described timing compensation, obtain the sync section behind the compensate of frequency deviation according to the frequency offset estimating value of described fractional part;
Sync section behind the described compensate of frequency deviation is carried out fast fourier transform, the sync section after the acquisition conversion;
Sync section after the described conversion is carried out symmetrical correlation computations, obtain the frequency offset estimating value of integer part according to the auto-correlation peak;
According to the frequency offset estimating value of the described first initial estimated position, fractional part and the frequency offset estimating value of integer part, obtain described estimated initial position and frequency offset estimating value.
6. method for synchronous according to claim 5, the wherein said operation that described sync section is carried out symmetrical correlation computations is specially:
Symmetrical correlation computations is carried out in all or part pointwise to described sync section.
7. method for synchronous according to claim 5, wherein said according to the frequency offset estimating value of the described first initial estimated position, fractional part and the frequency offset estimating value of integer part, the operation that obtains described estimated initial position and frequency offset estimating value is specially:
Acquisition is as the described first initial estimated position of described estimated initial position;
The frequency offset estimating value of described fractional part and the frequency offset estimating value of integer part are carried out sum operation, obtain sum operation result as described frequency offset estimating value.
8. method for synchronous according to claim 5, wherein after the sync section after obtaining compensate of frequency deviation, before the fast fourier transform, further comprising the steps of:
Symmetrical correlation computations is carried out in sync section pointwise behind the described compensate of frequency deviation, obtain the second estimated initial position of described sync section according to the auto-correlation peak.
9. method for synchronous according to claim 7, wherein said according to the described first initial estimated position, fractional part the frequency offset estimating value and the operation of the frequency offset estimating value of integer part be specially:
Acquisition is as the described second estimated initial position of described estimated initial position;
The frequency offset estimating value of described fractional part and the frequency offset estimating value of integer part are carried out sum operation, obtain sum operation result as described frequency offset estimating value.
10. method for synchronous according to claim 5 wherein saidly carries out symmetrical correlation computations to the sync section after the conversion, and the operation that obtains the frequency offset estimating value of integer part according to the auto-correlation peak is specially:
Symmetrical correlation computations is carried out in sync section pointwise after the described conversion, obtain the frequency offset estimating value of described integer part according to the auto-correlation peak.
11. method for synchronous according to claim 5 wherein saidly carries out symmetrical correlation computations to the sync section after the conversion, the operation that obtains the frequency offset estimating value of integer part according to the auto-correlation peak is specially:
Symmetrical correlation computations is carried out in the sequence pointwise that the odd number of the sync section after the described conversion partly constitutes, obtain the frequency offset estimating value of described integer part according to the auto-correlation peak.
12. method for synchronous according to claim 5, wherein organized multiplexing after being the Frame of synchronizing symbol with multinomial sequence when receiving more, calculate the frequency offset estimating value of the integer part of each group respectively, and carry out cascading judgement according to result to each group, obtain the frequency offset estimating value of court verdict as described integer part.
13. method for synchronous according to claim 1, wherein said multiphase sequence adopt normal amplitude zero autocorrelation sequence or generalized chirp sequence.
14. a synchro system that is used for multicarrier system comprises:
The frame receiver module, being used to receive multiplexing with multinomial sequence is the Frame of synchronizing symbol;
Demultiplexing module is used for going out data division and corresponding to the sync section of described synchronizing symbol from this Frame demultiplexing;
The original position computing module is used for described sync section is calculated, and obtains the estimated initial position of fast fourier transform;
The frequency offset calculation module is used for described sync section is calculated, and obtains the frequency offset estimating value;
Regularly compensating module is used for according to described estimated initial position described data division being carried out the timing compensation;
The compensate of frequency deviation module is used for being worth described data division according to described frequency offset estimating and carries out compensate of frequency deviation.
15. synchro system according to claim 14, wherein said synchronizing symbol becomes positive integer same multiphase sequence doubly for two of repeating.
16. synchro system according to claim 14, wherein said original position computing module specifically comprises:
First start bit is put computing unit, is used for described sync section is carried out symmetrical correlation computations, obtains the first initial estimated position of described sync section according to the auto-correlation peak.
17. synchro system according to claim 15, wherein said frequency offset calculation module specifically comprises:
The first timing compensating unit is used for the described first initial estimated position sync section being compensated, the sync section after obtaining regularly to compensate;
Fractional part frequency offset calculation unit, be used for the sync section after the described timing compensation divided equally and be front and rear, and described front and rear carried out conjugate multiplication, and obtain the result's of conjugate multiplication argument part, described argument partly is converted into the frequency offset estimating value of fractional part;
The fractional part frequency offset compensation element is used for the sync section after frequency offset estimating value according to described fractional part compensates described timing compensation, obtains the sync section behind the compensate of frequency deviation;
Fast Fourier transform unit is used for the sync section behind the described compensate of frequency deviation is carried out fast fourier transform, the sync section after the acquisition conversion;
Integer part frequency offset calculation unit is used for the sync section after the described conversion is carried out symmetrical correlation computations, obtains the frequency offset estimating value of integer part according to the auto-correlation peak;
The frequency offset estimating value obtains the unit, is used for obtaining described frequency offset estimating value according to the frequency offset estimating value of described fractional part and the frequency offset estimating value of integer part.
18. synchro system according to claim 16, wherein said original position computing module also comprises:
The second original position computing unit, be used for after the sync section after obtaining compensate of frequency deviation, before the fast fourier transform, symmetrical correlation computations is carried out in the sync section pointwise behind the described compensate of frequency deviation, obtain the second estimated initial position of described sync section according to the auto-correlation peak.
19. according to claim 17 described synchro systems, wherein also comprise the cascading judgement module, be used for having organized multiplexing after being the Frame of synchronizing symbol with multinomial sequence when receiving more, to calculate the frequency offset estimating value of the integer part of each group respectively, and carry out cascading judgement according to result to each group, obtain the frequency offset estimating value of court verdict as described integer part.
20. synchro system according to claim 14, wherein said multiphase sequence are normal amplitude zero autocorrelation sequence or generalized chirp sequence.
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| CN101702705B (en) * | 2009-11-13 | 2012-05-30 | 北京邮电大学 | Synchronizing method and system for multi-carrier system |
| CN101626359B (en) * | 2009-08-07 | 2013-04-10 | 复旦大学 | Frequency-domain synchronous circuit structure applicable to CMMB and DVB-H |
| CN103095627A (en) * | 2011-10-28 | 2013-05-08 | 中国移动通信集团广东有限公司 | Orthogonal frequency division multiplexing (OFDM) technology system synchronization method and electronic device |
| CN103262447A (en) * | 2011-03-14 | 2013-08-21 | 日电（中国）有限公司 | Method and apparatus for primary synchronization signal detection |
| CN104363196A (en) * | 2014-11-26 | 2015-02-18 | 中国联合网络通信集团有限公司 | Synchronizing method and receiving end |
| CN106549896A (en) * | 2015-09-23 | 2017-03-29 | 中南大学 | A kind of Novel timing synchronization of general zero auto-correlation code and frequency excursion algorithm |
| CN109218242A (en) * | 2017-06-30 | 2019-01-15 | 中兴通讯股份有限公司 | Symbol timing synchronization method, signal adjustment system and computer readable storage medium |
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| CN100373831C (en) * | 2003-04-29 | 2008-03-05 | 电子科技大学 | Method for separating user data from training sequence in multicarrier system |
| CN100505595C (en) * | 2003-05-30 | 2009-06-24 | 电子科技大学 | OFDM time synchronous method based on training sequence |
| CN1306745C (en) * | 2003-05-30 | 2007-03-21 | 电子科技大学 | Guiding plan based on time frequency synchronous training sequence |
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| CN101626359B (en) * | 2009-08-07 | 2013-04-10 | 复旦大学 | Frequency-domain synchronous circuit structure applicable to CMMB and DVB-H |
| CN101702705B (en) * | 2009-11-13 | 2012-05-30 | 北京邮电大学 | Synchronizing method and system for multi-carrier system |
| CN103262447A (en) * | 2011-03-14 | 2013-08-21 | 日电（中国）有限公司 | Method and apparatus for primary synchronization signal detection |
| US9237536B2 (en) | 2011-03-14 | 2016-01-12 | Nec (China) Co., Ltd. | Method and apparatus for primary synchronization signal detection |
| CN103095627A (en) * | 2011-10-28 | 2013-05-08 | 中国移动通信集团广东有限公司 | Orthogonal frequency division multiplexing (OFDM) technology system synchronization method and electronic device |
| CN103095627B (en) * | 2011-10-28 | 2016-12-07 | 中国移动通信集团广东有限公司 | A kind of orthogonal frequency division multiplexi system synchronization method and electronic equipment |
| CN104363196A (en) * | 2014-11-26 | 2015-02-18 | 中国联合网络通信集团有限公司 | Synchronizing method and receiving end |
| CN104363196B (en) * | 2014-11-26 | 2017-09-19 | 中国联合网络通信集团有限公司 | A kind of synchronous method and receiving terminal |
| CN106549896A (en) * | 2015-09-23 | 2017-03-29 | 中南大学 | A kind of Novel timing synchronization of general zero auto-correlation code and frequency excursion algorithm |
| CN109218242A (en) * | 2017-06-30 | 2019-01-15 | 中兴通讯股份有限公司 | Symbol timing synchronization method, signal adjustment system and computer readable storage medium |
| CN109218242B (en) * | 2017-06-30 | 2022-10-25 | 中兴通讯股份有限公司 | Symbol synchronization method, signal adjustment system, and computer-readable storage medium |
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