CN106850489A - The reception device of leading symbol - Google Patents

Abstract

The invention provides a kind of reception device of leading symbol, have first to make a reservation for three sections of spatial structures or second predetermined three sections of time-domain symbols of spatial structure at least one transmitted by receiving end/sending end, including：Judging part is received, physical frame is processed to obtain baseband signal and judge the leading symbol received with the presence or absence of expectation in the baseband signal；Location division, it is determined that position of the leading symbol for receiving in physical frame；And analysis unit, the signaling information entrained by the leading symbol is solved in the presence of signaling information, can improving performance and such timing synchronization algorithm is more general to greatest extent, complexity is low.

Description

The reception device of leading symbol

The application is the divisional application of original bill, the application number 201510076216.0 of original bill, 2 months 12 applying date 2015 year Day, invention and created name " method of reseptance and device of leading symbol ".

Technical field

The invention belongs to field of broadcast communication, and in particular to a kind of reception device of leading symbol.

Background technology

At present, realize that transmitting terminal and the synchronous method of destination time are substantially come real based on leading symbol in ofdm system Existing.Leading symbol is all known symbol sebolic addressing of transmitting terminal and receiving terminal of ofdm system, leading symbol mark physical frame Beginning (being named as P1 symbols), only occur in each physical frame a P1 symbol or it is continuous there are multiple P1 symbols, P1 is accorded with Number purposes include：

1) whether receiving terminal is rapidly detected with determine to transmit in channel is the signal expecting to receive；

2) basic configured transmission (such as FFT points, frame type information etc.) is provided, receiving terminal is carried out at receipt of subsequent Reason；

3) original carrier frequency deviation and timing error are detected, frequency and Timing Synchronization is reached after being used to compensate；

4) emergency alarm or broadcast system wake up.

Common, leading symbol includes physical layer formats control section (PHY Format Control, or PFC) and physics Layer content-control part (PHY Content Control, or PCC), the leading symbol of DVB_T2 systems includes P1 and P2, uses Signaling information or it is further used for transmission frame format parameter in transmission.However, method of reseptance of the prior art for leading symbol, Required signaling is transmitted in view of transmitted multiple leading symbols to lead to adaptive system needs, thus the method for reseptance of receiving terminal Not high with property, often algorithm complex is higher in timing synchronization procedure, and the transmission performance of system is relatively low.

The content of the invention

The problem that the present invention is solved is that the method for reseptance prior art of leading symbol is for leading symbol in prior art Method of reseptance, it is contemplated that transmitted multiple leading symbols transmit required signaling with adaptive system needs, thus receiving terminal Method of reseptance versatility is not high, and often algorithm complex is higher in timing synchronization procedure, and the transmission performance of system is relatively low.

To solve the above problems, a kind of method of reseptance of leading symbol is the embodiment of the invention provides, at least one Make a reservation for three sections of spatial structures or second predetermined three sections of time-domain symbols of spatial structure with first, it is characterised in that with as follows Step：Physical frame is processed to obtain baseband signal and judge the leading character received with the presence or absence of expectation in baseband signal Number；It is determined that position of the leading symbol for receiving in physical frame；And the leading symbol institute is solved in the presence of signaling information The signaling information of carrying, wherein, containing preliminary in judging baseband signal with the presence or absence of the leading symbol step for expecting to receive Timing Synchronization mode, the preliminary Timing Synchronization mode is included：It is predetermined three sections using first predetermined three sections of spatial structures and/or second Spatial structure is distinctive to deal with relationship and/or modulation relation, necessary inverse processing is carried out to baseband signal and/or signal demodulation is laggard Row postpones to slide auto-correlation to obtain one or more groups of accumulated correlation values；And prolonged based on one or more groups of accumulated correlation values After slow relationship match and/or specific predetermined mathematical computing, operation values are used for initial timing synchronization, primarily determine that leading symbol In the position of physical frame, when leading symbol includes multiple three-stage structures, Part III C in multigroup three-stage structure can be respectively obtained Three cumulative correlations and Part I A between, between Part I A and Part II B and Part III C and Part II B Value is U_ca' (n), U_cb' (n), U_abIn ' (n) any one or any at least two, based on one group in multigroup accumulated correlation values Or it is multigroup carry out postponing relationship match and/or predetermined mathematical computing obtaining final operation values, the final operation values are used for initial It is synchronous.

Alternatively, wherein, if using K time-domain symbol, making a reservation for three sections of spatial structures or second predetermined with first respectively Three sections of spatial structures, when the K time-domain symbol is arranged as first C-A-B, follow-up K-1 B-C-A, have pre- using the K At least one of fixed three sections of time-domain symbols of spatial structure are multiple, obtain accumulated correlation values

WillIn one or more carry out delay relation With and/or phase adjustment after be added again or averagely, obtained the first operation values U_caN (), delay matching relation is comprising following All or part：

And

WillIn one or more postponed It is added again after relationship match and/or phase adjustment or averagely, is obtained the second operation values U_cb-ab(n), delay matching relation Comprising following all or parts：

And

WillIn one or more carry out delay relation It is added again after matching and/or phase adjustment or averagely, is obtained the 3rd operation values U_ab-cb(n).Delay matching relation is included Following all or parts：

And

Finally, based on the first final operation values U_ca(n) and the second final operation values U_cb-ab(n) and the 3rd final operation values U_ab-cbN one or more of () carry out delay matching and carry out certain operations again, delay matching relation comprising following whole or Part：

U_ca(n), U_cb-ab(n), U_ab-cb(n-N_A)。

Alternatively, wherein, have using K make a reservation in three sections of time-domain symbols of spatial structure any one or it is any at least Two obtain accumulated correlation values.

Alternatively, wherein, during at least one has and makes a reservation for three sections of time-domain symbols of spatial structure, first time-domain symbol tool Some three-stage structures are prefix-body-suffix formula three-stage structure CAB, and the three-stage structure that follow-up time-domain symbol has is super Prefix-prefix-body type three-stage structure BCA, the length of just Part I is set to N_A, the length of Part II is set to Len_B, The length of Part III is set to Len_C, Part II B starting points are chosen in prefix-body-suffix formula three-stage structure CAB and are corresponded to The first sampled point sequence number of Part I A is set to N1_1, will in advance sew selection second in-prefix-body type three-stage structure BCA The the second sampled point sequence number for dividing B starting points to correspond to Part I A is set to N1_2, meets below equation：N1_1+N1_2=2N_A- (Len_B+Len_c), and N1_1+Len_B=N_A。

Alternatively, wherein, by the delay relevant treatment of wherein predetermined quantity using delay number carry out plus-minus one, shape Itself postponing number, Jia one and postpone number, the delay number that subtracts into after having itself and each plus-minus one, postponing numbers according to this three implements cunnings It is dynamic to postpone auto-correlation, then a correlated results is selected with predetermined selected rule.

Alternatively, it is additionally included in after selecting a correlated results with predetermined selected rule, is estimated based on correlated results Sampling frequency deviation.

Alternatively, after the preliminary Timing Synchronization of leading symbol is completed, U is taken_caN the angle of maximum obtains first jiao in () Degree, calculates the first small inclined estimate, then by U_cb-ab(n) and U_ab-cbAfter (n) conjugate multiplication, the corresponding angle of maximum is also taken Second angle is obtained, so as to calculate the second small inclined estimate, is worth to based on the small inclined estimation of the first small inclined estimate and second Small inclined estimate.

The embodiment of the present invention additionally provides a kind of reception device of leading symbol, for transmitted by receiving end/sending end at least One has first to make a reservation for three sections of spatial structures or second predetermined three sections of time-domain symbols of spatial structure, it is characterised in that including： Judging part is received, physical frame is processed with before obtaining baseband signal and judging in baseband signal with the presence or absence of expecting to receive Lead symbol；Location division, it is determined that position of the leading symbol for receiving in physical frame；And analysis unit, exist in signaling information When solve signaling information entrained by the leading symbol, wherein, receive judging part and/or preliminary Timing Synchronization list contained in location division Unit, preliminary time synchronization unit is at least used for：Make a reservation for three sections of spatial structures and/or second predetermined three sections of spatial structures using first It is distinctive to deal with relationship and/or modulation relation, carry out delay cunning after necessary inverse processing and/or signal demodulation are carried out to baseband signal Dynamic auto-correlation obtains one or more groups of accumulated correlation values；And carry out delay relation based on one or more groups of accumulated correlation values With and/or specific predetermined mathematical computing after, operation values are used for initial timing synchronization, primarily determine that leading symbol in physical frame Position, when leading symbol includes multiple three-stage structure, Part III C and first can be respectively obtained in multigroup three-stage structure Between point A, three accumulated correlation values between Part I A and Part II B and Part III C and Part II B be U_ca′ (n), U_cb' (n), U_abIn ' (n) any one or any at least two, based on multigroup accumulated correlation values in it is one or more groups of enter Row postpones relationship match and/or predetermined mathematical computing obtains final operation values, and the final operation values are used for into initial synchronisation.

Compared with prior art, technical solution of the present invention has the advantages that：

The method of reseptance and reception device of the leading symbol for providing according to embodiments of the present invention, due to at least one Time-domain symbol with three-stage structure, based on three sections of relations between multiple time-domain symbols using postponing relationship match and/or pre- Determine mathematical operation to be timed synchronization, to greatest extent improving performance and such timing synchronization algorithm is more general, complexity It is low.

Brief description of the drawings

Fig. 1 is the spatial structure schematic diagram of physical frame in embodiments of the invention；

Fig. 2 is the Physical Frame Structure signal comprising form control section and content-control part in embodiments of the invention Figure；

Fig. 3 is the schematic diagram of the first three-stage structure in embodiments of the invention；

Fig. 4 is second schematic diagram of three-stage structure in embodiments of the invention；

Fig. 5 is four logical schematics of the Timing Synchronization mode of time-domain symbol in embodiments of the invention.

Specific embodiment

Inventor has found the method for reseptance and device of leading symbol in prior art, not special for multiple three-stage structures It is CAB not to be first, behind be entirely that the leading symbol of BCA structures does special explanation and optimizes.

Regarding to the issue above, inventor is by research, there is provided a kind of three sections of relations based between multiple time-domain symbols Synchronization is timed using relationship match and/or predetermined mathematical computing is postponed, to greatest extent improving performance and such fixed When synchronized algorithm it is more general, complexity is low.

In order that the above objects, features and advantages of the present invention can become apparent it is understandable, below in conjunction with the accompanying drawings to this hair Bright specific embodiment is described in detail.

The applicable transmitting terminal of the method for reseptance of leading symbol of the invention need to meet predetermined three-stage structure rule, transmitting terminal profit Signaling information is transmitted with least one time domain with predetermined three-stage structure, time-domain symbol can make a reservation for three sections of time domains using first Structure (i.e. CAB) or second make a reservation for three sections of spatial structures (i.e. BCA) in any one.Below just by Fig. 1 to Fig. 4 in originator The spatial structure of required satisfaction is described explanation.

Fig. 1 is the spatial structure schematic diagram of physical frame in embodiments of the invention.

As shown in figure 1, the physical frame transmitted by this implementation transmitting terminal includes leading symbol and data area respectively, wherein, Before leading symbol is located at data area.

Data area is used for transmitting data information, such as TS bags or IP bags etc..

Whether it is the signal expecting to receive that leading symbol is used to rapidly detecting with determine to transmit in channel, there is provided basic Configured transmission (such as FFT points, frame type information etc.), makes receiving terminal to carry out receipt of subsequent treatment；Detect original carrier Frequency deviation and timing error, reach frequency and Timing Synchronization after being used to compensate；Urgent broadcast wake-up etc..

Fig. 2 is the Physical Frame Structure signal comprising form control section and content-control part in embodiments of the invention Figure.

As shown in Fig. 2 Physical Frame Structure includes leading symbol and data area, wherein leading symbol is included：By physical layer Form control section PFC and physical layer content-control part PCC.Certainly, leading symbol involved in the present invention is not limited to Comprising PFC parts and PCC parts.

Form control section PFC is made up of (oblique wire frame representation is used in figure) one or more time-domain symbols, during each OFDM Domain symbol size is identical.In the present embodiment, time-domain symbol uses OFDM symbol, as shown in Figure 2, in the present embodiment, transmitting terminal Used comprising four time-domain symbols in the PFC of form control section.

Fig. 3 is the schematic diagram of the first three-stage structure in embodiments of the invention；It is in embodiments of the invention with Fig. 4 Two kinds of schematic diagrames of three-stage structure.

At least one time-domain symbol is included in the form control section PFC of leading symbol, due to time domain symbol in the present embodiment Following the first three-stage structure or second three-stage structure number are used, thus, the time-domain symbol that leading symbol is included also may be used Referred to as three-stage structure time-domain symbol.But be not limited, meeting the time-domain symbol in above-mentioned leading symbol can also adopt With the other structures of not three-stage structure.

By Fig. 3 and Fig. 4, in the present embodiment one, time-domain symbol has following three-stage structure：Such as first in Fig. 3 Plant three-stage structure：Prefix (C sections), Yi Jiji that time domain main running signal (A sections), the rear portion based on the time domain main running signal are generated The suffix (B sections) of part generation is chosen in prefix ranges in time domain main running signal；Such as second three-stage structure in Fig. 4： Prefix (C sections) that time domain main running signal (A sections), the rear portion based on the time domain main running signal are generated and based on time domain main body Signal is chosen the advanced of part generation in prefix ranges and is sewed (B sections).

By one section of time domain main running signal (being indicated using A in figure), used as Part I, the least significant end of neat Part I is according to pre- The fixed rule that obtains takes out a part, and predetermined process is simultaneously copied to the front portion of the Part I and (marked with C in figure generating Part III Show) so that as prefix, meanwhile, a part is taken out according to the predetermined rule that obtains from the rear portion of Part I, predetermined process is carried out Process and copy to the rear portion of the Part I or process and copy to the front portion of prefix and generate Part II (with B in figure Sign) so as to mutually should be used as suffix respectively or sew in advance so that, generate respectively B as shown in Figure 3 as suffix the first three Segment structure (CAB structures) and B are used as second three-stage structure (BCA structures) as shown in Figure 4 sewed in advance.

From the point of view of the time-domain symbol with three-stage structure, the leading symbol generated in the present embodiment can be included：Tool There is the time-domain symbol of the first three-stage structure；Or with second time-domain symbol of three-stage structure；If or in no particular order arranging Doing a time-domain symbol with the first three-stage structure and/or several has second freedom of the time-domain symbol of three-stage structure Combination.That is leading symbol can only include CAB or BCA, or several CAB or several BCA, or quantity is not limited Any independent assortment for arranging in no particular order of several CAB and several BCA.It should be strongly noted that before of the invention Lead symbol but be not limited to the only structure comprising C-A-B or B-C-A, also can also include other spatial structures, such as tradition CP knots Structure etc..

A sections is obtained for example, by 2048 points of IFFT conversion based on certain section of frequency domain main body sequence, by the C in three-stage structure Section is the direct copying of a part in A sections, and B sections is the modulated signal section of a part in A sections, and the data area of B is no more than C's Data area, that is, select the scope to the part A of modulated signal section B without departing from the model intercepted as the part A of prefix C Enclose.Preferably, the length sum of the length of B and C is the length of A.

If N_AIt is the length of A, if Len_CIt is the length of C, Len_BIt is the length of modulated signal section B.If the sampled point sequence number of A It is 0,1 ... N_A- 1. set the sampling that N1 is copied to the corresponding Part I A of starting point of modulated signal section Part II B as selection Point sequence number, N2 is the sampled point sequence number of the corresponding Part I A of terminal that selection is copied to modulated signal section Part II B.Its In,

N2=N1+Len_B- 1 (formula 1)

Generally, that Part II B sections is implemented is modulated to frequency modulation, modulation M sequence or other sequences etc., in this implementation By taking frequency modulation as an example, if P1_A (t) is the time-domain expression of A, then the time-domain expression of the first common leading symbol is

Wherein, frequency modulation value f_SHThe corresponding i.e. 1/N in subcarrier in frequency domain interval of time-domain OFDM symbol can be chosen for_AT, or 1/(Len_B+Len_c) T wherein T be the sampling period, N_AIt is the length of time-domain OFDM symbol, such as, N_AIt is 1024, takes f_SH=1/ 1024T, and frequency modulation can arbitrarily select first phase.In order that correlation peak is sharp, f_SHIt is 1/ (Len that can also select_BT) or Close to the numerical value of its value.

In the structure of B-C-A, frequency modulation value is just with C-A-B structures conversely, and modulation can arbitrarily select first phase.

The first sampling that Part II (B) starting point corresponds to Part I (A) will be chosen in the first three-stage structure (CAB) Point sequence number is set to N1_1, and Part I (A) is corresponded to by Part II (B) starting point is chosen in second three-stage structure (BCA) Second sampled point sequence number is set to N1_2, the first sampled point sequence number N1_1 and the second sampled point sequence number N1_2 to be needed to meet below equation

N1_1+N1_2=2N_A-(Len_B+Len_c) (formula 4)

Meeting the benefit of such relation is, the delay relation of C sections to B sections of identical content is tied with B-C-A in C-A-B structures The delay relation of B sections to A sections identical content is identical in structure, in C-A-B structures the delay relation of A sections to B sections of identical content with The delay relation of B sections to C sections identical content is identical in B-C-A structures, is realized beneficial to receiver.And C-A-B structures and B-C-A knots In structure, if the modulation to B sections of use is frequency modulation, two kinds of frequency deviation value f of structure_SHContrast is wanted, beneficial to reception Machine is realized.

In addition, generally taking N1_1+Len_B=N_A。

The symbol of C-A-B structures is represented with sequence number 1, the symbol of B-C-A structures is represented with sequence number 2.It is A1 then to set P1_A (t) Time-domain expression, P2_A (t) is the time-domain expression of A2, then the time-domain expression of C-A-B three-stage structures is

The time-domain expression of B-C-A three-stage structures is

Wherein, the first three-stage structure and second three-stage structure for arranging in no particular order, the difference according to priority can divide Do not form different by several the first three-stage structures and/or several second leading character of three-stage structure independent assortment Number.It is sequentially 1 time-domain expression of first leading symbol of C-A-B and 1 B-C-A that citing below is given, and is sequentially 1 The time-domain expression of second leading symbol of individual B-C-A and 1 C-A-B.

So, the time-domain expression of the first leading symbol is：

The time-domain expression of the second leading symbol is：

The time-domain expression of the first leading symbol and the second leading symbol can infer other C-A-B and B-C-A groups according to this Close and formed, it is no longer repeated herein.

In as above-mentioned situation, when C-A-B structures and B-C-A structures are cascaded, small inclined estimation under dangerous delays can be solved The problem of failure.When dangerous delays cause C sections and A sections to offset, first the CB of structure sections and second BC sections of structure still So can be used to Timing Synchronization and estimate small partially.

The quantity that leading symbol includes at least one time-domain symbol is set to transmit four symbols, is given below several More preferably four time-domain symbol structures, be sequentially arranged in following several structures any one：

(1) C-A-B, B-C-A, C-A-B, B-C-A；Or

(2) C-A-B, B-C-A, B-C-A, B-C-A；Or

(3) B-C-A, C-A-B, C-A-B, C-A-B；Or

(4) C-A-B, B-C-A, C-A-B, C-A-B；Or

(5) C-A-B, C-A-B, C-A-B, B-C-A；Or

(6) C-A-B, C-A-B, C-A-B, C-A-B or

(7) C-A-B, C-A-B, B-C-A, B-C-A.

Wherein, the structure of such four time-domain symbols of such as (1) C-A-B, B-C-A, C-A-B, B-C-A, the effect of cascade Fruit plays maximum.The structure of such four time-domain symbols of such as (2) C-A-B, B-C-A, B-C-A, B-C-A, by successive character A portions The protection interval divided is elongated, and usual first symbol is known signal, therefore uses C-A-B.

Include a preferred embodiment of three-stage structure, N_AIt is 2048, if Len_CIt is 520, Len_B=504, N1_1= 1544, N1_2=1528, make the expression formula that P1_A (t) is time domain main body A, then can derive the time domain table of C-A-B and B-C-A It is up to formula

And

Further, f_SHMay be selected to be 1/ (1024T) or 1/ (2048T).

Further, the different starting points that Part II B is chosen from Part I A can be utilized to be broadcasted come identifying emergent, i.e., By choosing different N1, or N1_1 and N1_2, by being copied to B sections of starting point come identifying emergent broadcast system.Such as C- The symbol of the three-stage structure of A-B, N1_1=1544 mark conventional systems, and N1_1=1528 identifying emergent broadcast systems.Compare again Such as, the symbol of the three-stage structure of B-C-A, N1_2=1528 mark conventional systems, and N1_2=1544 identifying emergent broadcast systems.

In the leading symbol generation method of transmitting terminal, comprising following such generation step：

Inversefouriertransform IFFT is carried out based on frequency domain subject sequence column-generation subcarrier in frequency domain and obtains time domain main running signal A, The time-domain symbol with three-stage structure as C-A-B or B-C-A is formed as time domain main running signal A again, so as to form this implementation There is the leading symbol of at least one time-domain symbol in example.

Above by the description done with reference to Fig. 1 to Fig. 4, the method for reseptance to leading symbol of the invention is targeted applicable Transmitting terminal at least one have predetermined three-stage structure time-domain symbol be illustrated.

In the present embodiment, the method for reseptance of the leading symbol for being provided, has first to make a reservation for three sections at least one Spatial structure or second predetermined three sections of time-domain symbols of spatial structure, the method for reseptance of the leading symbol have following steps：

Step S1：Physical frame is processed and is received with the presence or absence of expectation in baseband signal with obtaining baseband signal and judging Leading symbol；

Step S2：It is determined that position of the leading symbol for receiving in physical frame；And

Step S3：The signaling information entrained by the leading symbol is solved in the presence of signaling information.

Wherein, preliminary Timing Synchronization is contained in judging baseband signal with the presence or absence of the leading symbol step for expecting to receive Mode, the preliminary Timing Synchronization mode is included：

Using first make a reservation for three sections of spatial structures and/or second predetermined three sections of spatial structures it is distinctive deal with relationship and/or Modulation relation, carries out to baseband signal carrying out after necessary inverse processing and/or signal demodulation postponing sliding auto-correlation obtaining one group Or multigroup accumulated correlation values；And

After carrying out postponing relationship match and/or specific predetermined mathematical computing based on one or more groups of accumulated correlation values, will Operation values are used for initial timing synchronization, primarily determine that leading symbol in the position of physical frame,

Wherein, when leading symbol includes multiple three-stage structure, can respectively obtain in multigroup three-stage structure Part III C and Three accumulated correlation values between Part I A, between Part I A and Part II B and Part III C and Part II B That is U_ca' (n), U_cb' (n), U_abIn ' (n) any one or any at least two, based on a group in multigroup accumulated correlation values or It is multigroup to carry out postponing relationship match and/or predetermined mathematical computing obtaining final operation values, the final operation values are used for initial same Step.

It is below CAB structures to first be directed to, subsequently with the preliminary Timing Synchronization side of the time-domain symbol for being BCA structures Formula is illustrated.

Wherein, formula N1_1+N1_2=2N is met_A-(Len_B+Len_c), and N1_1+Len_B=N_A。

Specifically, N_AIt is 2048, if Len_CIt is 520, Len_B=504, N1_1=1544, N1_2=1528, f_SH=1/ As a example by (2048T).

Wherein, it is peculiar using C-A-B and/or B-C-A when leading symbol has the spatial structure of C-A-B or B-C-A Deal with relationship and/or modulation relation, baseband signal is carried out necessary inverse processing and/or signal demodulation after carry out delay slip Auto-correlation obtains 1 group or multigroup accumulated correlation values, then based on one or more groups of accumulated correlation values postpone relationship match and/ Or after specific mathematical operation, operation values are used for initial timing synchronization, primarily determine that leading symbol in the position of physical frame.Lift For example, postpone slip auto-correlation acquisition accumulated correlation values formula as follows：

May be selected to U₁' (n) carries out energy normalized and obtains U_1s′(n)。

I.e.

Energy normalized can also take other method, U₁Conjugate operation * is taken in (n), can also be realized by r (n), and r (n- N_A) conjugation is not taken.

In the structure of each C-A-B or B-C-A, can respectively obtain the CA based on identical content, AB and CB tri- and add up Correlation.

Enter line slip delay to A sections of identical part using C sections related, can add the step of note above-mentioned energy normalized On, repeat no more here.The structure of every 1 C-A-B or B-C-A can obtain three correlations：U_ca' (n), U_cb' (n), U_cb′(n)

Enter line slip using the B sections of part for only modulating frequency deviation identical with C sections and postpone correlation：

When C-A-B structures,

When B-C-A structures,

Enter line slip using the B sections of part for only modulating frequency deviation identical with A sections and postpone correlation：

When C-A-B structures,

When B-C-A structures,

Wherein, the desirable 1/f of corr_len_SHT, to avoid continuous wave CO_2 laser, or takes Len_BTo cause peak value sharp.

And when leading symbol includes multiple time-domain symbols and time-domain symbol uses three-stage structure, multigroup CA is can obtain, Tri- accumulated correlation values of AB and CB, i.e. U_ca' (n), U_cb' (n), U_ab' (n), using the U_ca' (n), U_cb' (n), U_abIn ' (n) Any one any at least two obtains one group of accumulated correlation values, based on a group in many class values and multigroup carries out delay relation Matching and/or mathematical operation, obtain final operation values, and the final operation values are used for into initial synchronisation.

Such as, for for the preferred K time-domain symbol with three-stage structure, it is arranged as C-A-B, B-C-A, B-C- First symbol is C-A-B structures when A, B-C-A ..., B-C-A., and follow-up K-1 is all B-C-A structures, is obtained It should be noted that, also may be used Make a reservation in three sections of time-domain symbols of spatial structure any one or any at least two obtain cumulative correlation to have using K Value, the present invention is not defined to the quantity using time-domain symbol, can be all of can also partly utilize.

Then can be byIn one or more carry out delay pass It is added again after system's matching and/or phase adjustment or averagely, is obtained last U_ca(n).Because they have it is identical Phase value.Delay matching includes following all or part, is exemplified below：

And

Wherein, it is contemplated that f in embodiment_SH=1/ (2048T), N_AIt is 2048, if Len_CIt is 520, Len_B=504, i.e. (N_A+ Len_B+Len_C)=3072, therefore) to enter horizontal phasing control, it is multiplied by e^jπ。

Can be byIn one or more postponed It is added again after relationship match and/or phase adjustment or averagely, is obtained last U_cb-ab(n).Because they have Identical phase value.Delay matching includes following all or part, is exemplified below：

And

Wherein, it is contemplated that f in embodiment_SH=1/ (2048T), N_AIt is 2048, if Len_CIt is 520, Len_B=504, i.e. (N_A+ Len_B+Len_C)=3072, therefore) to enter horizontal phasing control, it is multiplied by e^jπ。

Can be byIn one or more carry out delay pass It is added again after system's matching and/or phase adjustment or averagely, is obtained last U_ab-cb(n).Delay matching is comprising following complete Portion or part, are exemplified below：

And

Wherein, it is contemplated that f in embodiment_SH=1/ (2048T), N_AIt is 2048, if Len_CIt is 520, Len_B=504, i.e. (N_A+ Len_B+Len_C)=3072, therefore) to be multiplied by e^jπ.

Finally, based on U_ca(n) and U_cb-ab(n) and U_ab-cbN one or more of () carry out delay matching and carry out specific again Computing, delay matching here includes following all or part, is exemplified below：

U_ca(n), U_cb-ab(n), U_ab-cb(n-N_A)

Initial timing synchronization is completed based on operation result, optional network specific digit computing can be that absolute value is added.Such as take maximum Value position completes initial timing synchronization.

It should be noted that in view of the influence of systematic sampling clock deviation, in the above-described embodiments, can be by some of them Postpone the due number that postpones of correlator and add and subtract one, formation postpones numbers with three after plus-minus one in itself, according to these three delay numbers Implement to slide and postpone auto-correlation, reselection correlated results it is the most obvious that, can further estimate sampling frequency deviation.

Fig. 5 is four logical schematics of the Timing Synchronization mode of time-domain symbol in embodiments of the invention.

In Fig. 5, A represents N_A, B represents Len_B, C represents Len_C, respectively the 4 of CAB-BCA-BCA-BCA time-domain symbols this The logical schematic of the specific Timing Synchronization mode of sample, Fig. 5 also provides the arithmetic logic of small inclined estimate.

Special instruction, after the method for reseptance of leading symbol of the invention is in completion timing synchronization, takes U_caIn (n) most The angle of big value, obtains first angle, so as to calculate the first small inclined estimate, then by U_cb-ab(n) and U_ab-cbN () is conjugated phase After multiplying, the corresponding angle of maximum is also taken, obtain second angle, so as to calculate the second small inclined estimate.It is small partially based on first Estimate and the second small inclined estimate, can obtain small inclined estimate, and the part that FFO is calculated is marked in such as Fig. 5.

Not shown in figure, embodiments of the invention additionally provide a kind of reception device of leading symbol, are sent out for receiving Transmitted by sending end at least one has first to make a reservation for three sections of spatial structures or second predetermined three sections of time-domain symbols of spatial structure, The reception device of the leading symbol includes：Judging part is received, physical frame is processed to obtain baseband signal and judge base band With the presence or absence of the leading symbol for expecting to receive in signal；Location division, it is determined that position of the leading symbol for receiving in physical frame； And analysis unit, the signaling information entrained by the leading symbol is solved in the presence of signaling information.

Wherein, receive judging part and/or preliminary time synchronization unit is contained in location division, preliminary time synchronization unit is at least used In：

Using first make a reservation for three sections of spatial structures and/or second predetermined three sections of spatial structures it is distinctive deal with relationship and/or Modulation relation, carries out to baseband signal carrying out after necessary inverse processing and/or signal demodulation postponing sliding auto-correlation obtaining one group Or multigroup accumulated correlation values；And

After carrying out postponing relationship match and/or specific predetermined mathematical computing based on one or more groups of accumulated correlation values, will Operation values are used for initial timing synchronization, primarily determine that leading symbol in the position of physical frame,

When leading symbol includes multiple three-stage structures, Part III C and first in multigroup three-stage structure can be respectively obtained Three accumulated correlation values between the A of part, between Part I A and Part II B and Part III C and Part II B are U_ca' (n), U_cb' (n), U_abIn ' (n) any one or any at least two, based on a group in multigroup accumulated correlation values or many Group carries out postponing relationship match and/or predetermined mathematical computing obtains final operation values, and the final operation values are used for into initial synchronisation.

The generating means and reception device of the leading symbol provided in this implementation respectively can with above-described embodiment in before Lead the generation method of symbol, method of reseptance and distinguish corresponding, then the structure and technology essential factor having in device can be by giving birth to Accordingly change to be formed into method, repeat no more in this description will be omitted.

Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this hair Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention Any simple modification, equivalent variation and modification for being made to above example of technical spirit, belong to technical solution of the present invention Protection domain.

Claims (7)

1. a kind of reception device of leading symbol, at least one transmitted by receiving end/sending end have first it is predetermined three sections when Domain structure or second predetermined three sections of time-domain symbols of spatial structure, it is characterised in that including：

Judging part is received, physical frame is processed and be whether there is expectation in the baseband signal to obtain baseband signal and judge The leading symbol of reception；

Location division, it is determined that position of the leading symbol for receiving in physical frame；And

Analysis unit, solves the signaling information entrained by the leading symbol in the presence of signaling information,

Wherein, preliminary time synchronization unit is contained in the reception judging part and/or location division, and preliminary time synchronization unit is at least used In：

Make a reservation for three sections of spatial structures using first and/or second predetermined three sections of spatial structures are distinctive deals with relationship and/or modulate Relation, carries out carrying out after necessary inverse processing and/or signal demodulation postponing sliding auto-correlation obtaining one group or many to baseband signal Group accumulated correlation values；And

After carrying out postponing relationship match and/or specific predetermined mathematical computing based on one or more groups of accumulated correlation values, by computing It is worth for initial timing synchronization, primarily determines that leading symbol in the position of physical frame,

When leading symbol includes multiple three-stage structures, Part III C and first in multigroup three-stage structure can be respectively obtained Three accumulated correlation values between the A of part, between Part I A and Part II B and Part III C and Part II B are U_ca' (n), U_cb' (n), U_ab' in (n) any one or any at least two, based on a group in multigroup accumulated correlation values or many Group carries out postponing relationship match and/or predetermined mathematical computing obtains final operation values, and the final operation values are used for into initial synchronisation.

2. the reception device of leading symbol as claimed in claim 1, it is characterised in that：

Wherein, if the transmitting terminal uses K time-domain symbol, three sections of spatial structures or second predetermined three are made a reservation for first respectively Section spatial structure, when the K time-domain symbol is arranged as first C-A-B, follow-up K-1 B-C-A, the preliminary Timing Synchronization list Unit has at least one of predetermined three sections of time-domain symbols of spatial structure or multiple using the K, obtains accumulated correlation values

The preliminary time synchronization unit willIn one or many It is individual postpone being added again after relationship match and/or phase adjustment or averagely, obtain the first operation values U_caN (), postpones Matching relationship includes following all or parts：

$U_{ca}^1(n-(K-2)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C)-(N_A+2{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right),$

$\begin{array}{ccc}{U}_{ca}^2(n-(K-2)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right),& \mathrm{....}& U_{ca}^j(n-(K-j)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right)\end{array}$

And

$U_{ca}^K\left(n\right),$

The preliminary time synchronization unit willIn one Individual or multiple postpone being added again after relationship match and/or phase adjustment or averagely, obtains the second operation values U_cb-ab N (), delay matching relation includes following all or parts：

$U_{cb}^1(n-(K-2)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C)-(N_A+2{\mathrm{Len}}_B\left)\right),$

$\begin{array}{ccc}{U}_{ab}^2(n-(K-2)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right),& \mathrm{....}& U_{ab}^j(n-(K-j)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right)\end{array}$

And

$U_{ab}^K\left(n\right),$

The preliminary time synchronization unit willIn one or Multiple postpone being added again after relationship match and/or phase adjustment or averagely, obtains the 3rd operation values U_ab-cb(n)。 Delay matching relation includes following all or parts：

$U_{ab}^1(n-(K-2)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C)-(2{\mathrm{Len}}_B\left)\right),$

$\begin{array}{ccc}{U}_{cb}^2(n-(K-2)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right),& \mathrm{....}& U_{cb}^j(n-(K-j)\·(N_A+{\mathrm{Len}}_B+{\mathrm{Len}}_C\left)\right)\end{array}$

And

$U_{cb}^K\left(n\right),$

Finally, the preliminary time synchronization unit is based on the first final operation values U_ca(n) and the second final operation values U_cb-ab(n) and 3rd final operation values U_ab-cbN one or more of () carry out delay matching and carry out certain operations again, delay matching relation bag Containing following all or parts：

U_ca(n), U_cb-ab(n), U_ab-cb(n-N_A)。

3. the reception device of leading symbol as claimed in claim 2, it is characterised in that：

Wherein, the preliminary time synchronization unit utilizes K has any one in predetermined three sections of time-domain symbols of spatial structure Or any at least two obtain the accumulated correlation values.

4. the reception device of leading symbol as claimed in claim 1, it is characterised in that：

Wherein, described at least one have make a reservation for three sections of time-domain symbols of spatial structure in,

The three-stage structure that first time-domain symbol has is prefix-body-suffix formula three-stage structure CAB, and follow-up time domain symbol Number three-stage structure having to sew-prefix-body type three-stage structure BCA in advance,

The length of the Part I is set to N_A, the length of the Part II is set to Len_B, by the length of the Part III Degree is set to Len_C, Part II B starting points are chosen in the prefix-body-suffix formula three-stage structure CAB and correspond to Part I A The first sampled point sequence number be set to N1_1, will in advance sew and Part II B starting points pair chosen in-prefix-body type three-stage structure BCA N1_2 should be set in the second sampled point sequence number of Part I A, meet below equation:

N1_1+N1_2=2N_A-(Len_B+Len_c), and N1_1+Len_B=N_A。

5. the reception device of leading symbol as claimed in claim 1, it is characterised in that：

Wherein, the preliminary time synchronization unit postpone relationship match in, by the delay relevant treatment of wherein predetermined quantity Using delay number carry out plus-minus one, be formed with itself postponing number, delay number of Jia, subtracting and prolong after itself and each plus-minus one Count late, the preliminary time synchronization unit postpones numbers implementation slip and postpones auto-correlation according to this three, then with predetermined selected rule Select a correlated results.

6. the reception device of leading symbol as claimed in claim 5, it is characterised in that also include：

The preliminary time synchronization unit estimates sampling frequency deviation based on the correlated results.

7. the method for reseptance of leading symbol as claimed in claim 1, it is characterised in that

The preliminary time synchronization unit takes U_caN the angle of maximum obtains first angle in (), calculate the first small inclined estimation Value, then by U_cb-ab(n) and U_ab-cbAfter (n) conjugate multiplication, also take the corresponding angle of maximum and obtain second angle, so as to calculate Go out the second small inclined estimate,

The preliminary time synchronization unit is based on the first small inclined estimate and the second small inclined estimation is worth to small inclined estimate.