CN106998312A - The method of reseptance of leading symbol - Google Patents

Abstract

The invention provides a kind of method of reseptance of leading symbol, it is characterised in that the method for reseptance of leading symbol, it is characterised in that comprise the following steps：The physical frame received is handled to obtain baseband signal；Judge in the baseband signal with the presence or absence of the leading symbol for expecting to receive；It is determined that position of the leading symbol in physical frame that receives and solving the signaling information entrained by the leading symbol in the presence of signaling information, wherein, when in judging the baseband signal with the presence or absence of the leading symbol for expecting to receive, reliability judgement is carried out using any one following mode or any at least two modes independent assortment：Initial timing synchronization mode, integer frequency offset estimation mode, accurate Timing Synchronization mode, channel estimation mode and decoded result analysis mode, can solve the problem that mono-tone interference, and under dangerous delays the problem of small inclined estimation failure.

Description

The method of reseptance of leading symbol

The application is the divisional application of original bill, the Application No. 201510064118.5 of original bill, and the applying date of original bill is 2015/02/06, the invention and created name of original bill is《The generation method and method of reseptance of leading symbol》.

Technical field

The invention belongs to field of broadcast communication, and in particular to the generation method and method of reseptance of a kind of leading symbol and corresponding Device.

Background technology

At present, realize the transmitting terminal method synchronous with destination time substantially based on leading symbol come real 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 a P1 symbol in each physical frame or multiple P1 symbols continuously occur, P1 symbols Number purposes include：

1) whether make receiving terminal rapidly detect to determine to transmit in channel is the signal for expecting to receive；

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

3) original carrier frequency deviation and timing error are detected, to reach frequency and Timing Synchronization after compensating；

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 In transmission signaling information or it is further used for transmission frame format parameter.However, prior art P1 is only capable of transmitting 7 bit signallings, Cause system efficiency of transmission not enough, nor the system that can be suitably used for relevant decoding, do not consider by selecting leading character yet Number time-domain symbol number needed come signaling needed for transmitting with adaptive system.

The content of the invention

The problem of present invention is solved is that the leading symbol transmission method of prior art causes system efficiency of transmission not enough, and The system of relevant decoding can not be applied to, also do not considered needed for being transmitted by selecting the time-domain symbol number of leading symbol Signaling is needed with adaptive system.

To solve the above problems, the embodiments of the invention provide a kind of a kind of leading symbol of the generation method of leading symbol Generation method, it is characterised in that comprise the following steps：Based on frequency domain subject sequence column-generation subcarrier in frequency domain；To frequency domain Carrier wave carries out inversefouriertransform and obtains time domain main running signal；And formed by least one based on the time domain main running signal Time-domain symbol generates the leading symbol, wherein, the step of generating the subcarrier in frequency domain includes：For generating the frequency domain master The predetermined sequence create-rule of body sequence；And/or processing is carried out to the frequency domain main body sequence for generating the frequency domain load The predetermined process rule of ripple, the predetermined sequence create-rule includes the following combination of any one or two kinds：Based on different sequences Column-generation formula is produced；And/or produced based on same sequence production, the sequence of the generation is further subjected to cyclic shift, institute Predetermined process rule is stated to include：To the pre-generatmg subcarrier obtained by being handled based on the frequency domain main body sequence according to frequency deviation value Carry out phase-modulation.

Alternatively, wherein, to based on the pre-generatmg subcarrier with the frequency deviation value carry out phase-modulation the step of in, The subcarrier in frequency domain corresponding to the same time domain main running signal is using same frequency deviation value to each in the subcarrier in frequency domain Effective subcarrier carries out phase-modulation, the frequency that the subcarrier in frequency domain corresponding to the different time domain main running signals is utilized Bias is different.

Alternatively, in the predetermined sequence create-rule, the different sequence production is by assigning same Heng Bao Network zero auto-correlation sequence difference root is obtained, and the same sequence production is by assigning permanent same of envelope zero auto-correlation sequence It is worth to.

Alternatively, wherein, generate the subcarrier in frequency domain the step of include：Using in the predetermined sequence create-rule Based on different sequence productions to generate the frequency domain main body sequence.

Alternatively, wherein, generate the subcarrier in frequency domain the step of include：Using in the predetermined sequence create-rule The frequency domain main body sequence is generated based on different sequence productions, continues to utilize the book office to the frequency domain main body sequence Rule is managed to generate subcarrier in frequency domain.

Alternatively, wherein, the frequency domain main body sequence is based on one or more permanent envelope zero auto-correlation sequence life Into the frequency domain main body sequence has predetermined sequence length N_ZC。

Alternatively, when based on multiple permanent envelope zero auto-correlation sequence generations, each there is corresponding subsequence respectively Length L_M, there is sub-sequence length according to predetermined sequence create-rule generation to each permanent envelope zero auto-correlation sequence L_MSubsequence, multiple subsequences are spliced into the predetermined sequence length N_ZCThe frequency domain main body sequence.

Alternatively, the predetermined sequence length N that the frequency domain main body sequence has_ZCNo more than described time domain main running signal has Fourier transformation length N_FFT, include in the step of obtaining the pre-generatmg subcarrier based on the frequency domain main body series processing Filling step is handled, the processing filling step includes：With reference to predetermined sequence length N_ZCThe frequency domain main body sequence is mapped to just Frequency sub-carrier and negative frequency subcarrier；With reference to the Fourier transformation length N_FFTIn the positive frequency subcarrier and described negative Fill the virtual subcarrier and direct current subcarrier of predetermined number in frequency sub-carrier outward flange；And circulated gained subcarrier Move to left so that zero subcarrier corresponds to first position of inversefouriertransform.

Alternatively, the processing filling step is further comprising the steps of：PN modulation is carried out for the frequency domain main body sequence, So as to carry out the mapping again, for carrying out the PN to the corresponding frequency domain main body sequence of time domain main running signal each described It is identical or differ between the PN sequences of modulation.

Alternatively, wherein, the step for by the cyclic shift is carried out in the predetermined sequence create-rule, located at progress Before or after the PN modulation.

Alternatively, wherein, using the corresponding root in first time domain main running signal and/or for carrying out institute State the initial phase transmission information of the PN sequences of PN modulation.

Alternatively, wherein, when the subcarrier in frequency domain for carrying out signalling be using the predetermined sequence generation When rule is generated,

If first time domain main running signal is using previously known at least one described described time domain main running signal Frequency domain main body sequence, then the frequency domain main body sequence and the corresponding frequency deviation value are not used in transmission signaling.

Alternatively, wherein, the leading symbol be located at physical frame in, pass through the letter that the frequency domain subject sequence biographies are defeated Order, which is included, to be used to indicate the frame format parameter of the physical frame and/or for indicating emergency broadcasted content.

Alternatively, wherein, the time-domain symbol has following three-stage structures：Wherein, the first three-stage structure is included：It is described Time domain main running signal, the neat time domain main running signal end choose the prefix of part generation and based on the time domain main body Signal chooses the suffix of part generation in the prefix ranges；Second of three-stage structure is included：The time domain main running signal, Choose the prefix of part generation and based on the time domain main running signal in the prefix in the neat time domain main running signal end In the range of choose advanced the sewing of part generation, the leading symbol is included：During described with the first three-stage structure Domain symbol；Or the time-domain symbol with second of three-stage structure；Or arrange in no particular order several have described first Plant the time-domain symbol of three-stage structure and/or the independent assortment of several time-domain symbols with second of three-stage structure.

The embodiment of the present invention additionally provides a kind of generation method of leading symbol, it is characterised in that based on time domain main body letter Number generation with following three-stage structures time-domain symbol；And the leading character is generated based on time-domain symbol at least one described Number,

Wherein, the first three-stage structure is included：The time domain main running signal, the neat time domain main running signal end choose one The prefix of part generation and the suffix for choosing part generation in the prefix ranges based on the time domain main running signal； Second of three-stage structure is included：The time domain main running signal, the neat time domain main running signal end are chosen before part generation Sew and choose the advanced of part generation in the prefix ranges based on the time domain main running signal and sew, the leading character Number include：The time-domain symbol with the first three-stage structure；Or the time domain symbol with second of three-stage structure Number；Or arrange in no particular order several have the first three-stage structure time-domain symbol and/or several have second Plant the independent assortment of the time-domain symbol of three-stage structure.

Alternatively, wherein, the time domain main running signal is defined as Part I, the suffix or described advanced will be used as The time domain main running signal part sewed is defined as Part II, will be defined as the 3rd as the time domain main running signal part of the prefix Part, the Part III is that a part of direct copying based on the Part I is obtained, and the Part II is to be based on institute A part of frequency modulation for stating Part I is obtained..

Alternatively, wherein, the length of the Part I is set to N_A, the length of the Part II is set to Len_B, will The length of the Part III is set to Len_C, the Part II starting point will be chosen in the first described three-stage structure corresponding to institute The the first sampled point sequence number for stating Part I is set to N1_1, and the Part II starting point will be chosen in three-stage structure described in second The second sampled point sequence number corresponding to the Part I is set to N1_2, meets below equation：N1_1+N1_2=2N_A-(Len_B+ Len_c), carry out the frequency modulation value f of the frequency modulation_SHChoose subcarrier in frequency domain interval corresponding to the time-domain symbol i.e. 1/N_AT or 1/ (Len_B+Len_c) T, and modulation first phase arbitrarily select, T is the sampling period.

Alternatively, wherein, for the first each described three-stage structure and it is each second described in three-stage structure, N_AValue For 2048, if Len_CValue is 520, Len_BValue is 504, the first sampled point sequence number N1_1=1544, second sampling Point sequence number N1_2=1528, the frequency modulation value f_SHFor 1/ (1024T) or 1/ (2048T).

Alternatively, wherein, using choosing the different starting points of the Part II from the Part I come identifying emergent Broadcast.

Alternatively, wherein, the leading symbol include at least one time-domain symbol quantity be four.

Alternatively, wherein, the three-stage structure that four time-domain symbols have respectively is sequentially：It is described the first three Segment structure, second of three-stage structure, the first described three-stage structure and second of three-stage structure；Or described A kind of three-stage structure, second of three-stage structure, second of three-stage structure and second of three-stage structure；Or Second of three-stage structure, the first described three-stage structure, the first described three-stage structure and the first the three sections knots Structure；Or the first described three-stage structure, second of three-stage structure, the first described three-stage structure and it is described the first Three-stage structure；Or the first described three-stage structure, the first described three-stage structure, the first described three-stage structure and described Second of three-stage structure；Or the first described three-stage structure, the first described three-stage structure, the first described three-stage structure with And the first described three-stage structure；Or the first described three-stage structure, the first described three-stage structure, it is described second three sections Structure and second of three-stage structure.

Alternatively, the time domain main running signal is anti-by being carried out to the subcarrier in frequency domain generated based on frequency domain main body sequence Fourier transformation is obtained, wherein, the step of generating the subcarrier in frequency domain includes：For generating the pre- of the frequency domain main body sequence Sequencing column-generation rule；And/or the book office that processing is used to generate the subcarrier in frequency domain is carried out to the frequency domain main body sequence Reason rule, the predetermined sequence create-rule includes the following combination of any one or two kinds：Produced based on different sequence productions It is raw；And/or produced based on same sequence production, the sequence of the generation is further subjected to cyclic shift, the predetermined process Rule is included：Enter line phase according to frequency deviation value to the pre-generatmg subcarrier obtained by being handled based on the frequency domain main body sequence to adjust System.

The embodiment of the present invention additionally provides a kind of method of reseptance of leading symbol, it is characterised in that to the physics received Frame is handled to obtain baseband signal；Judge in the baseband signal with the presence or absence of the leading symbol for expecting to receive；It is determined that connecing Position of the leading symbol in physical frame received simultaneously solves the letter entrained by the leading symbol in the presence of signaling information Make information.

Alternatively, wherein, in judging the baseband signal with the presence or absence of expect receive the leading symbol when, can profit Carried out reliability with any one following mode or any at least two modes independent assortment and judged：Initial timing synchronization side Formula, integer frequency offset estimation mode, accurate Timing Synchronization mode, channel estimation mode and decoded result analysis mode.

Alternatively, wherein, PRELIMINARY RESULTS as obtained by the initial timing synchronization mode carries out fractional part of frequency offset estimation.

Alternatively, wherein, when first time domain main running signal at least one described time domain main running signal is not passed When defeated signaling is Given information, the initial timing synchronization mode is included：Difference fortune is carried out by first time-domain symbol Calculate, and the corresponding time domain sequences of Given information are also subjected to calculus of differences, then both are subjected to cross-correlation and obtain cross correlation value, base In obtained one or more cross correlation values, initial synchronisation is at least carried out based on this result.

Alternatively, wherein, the integer frequency offset estimation is carried out based on the result obtained by the initial timing synchronization mode Mode.

Alternatively, in the step of carrying out integer frequency offset estimation, including any one in following two modes or two kinds Combination：First integer frequency offset estimation mode is included：Use sweep method to all or part of time domain waveform for intercepting out with After different frequency deviations are modulated, several frequency sweep time-domain signals are obtained, Fourier inversion institute will be carried out by known frequency domain sequence Known time-domain signal with each the frequency sweep time-domain signal enter line slip it is related after, by the frequency sweep of maximum correlation peaks The frequency deviation value that time-domain signal is modulated is integer frequency offset estimation value；And/or second integer frequency offset estimation mode include：Will Subcarrier in frequency domain according to obtained by the position result of initial timing synchronization intercepts the main body time-domain signal progress Fourier transformation Cyclic shift is carried out by different shift values in swept frequency range, the receiving sequence corresponding to effective subcarrier is intercepted, to the reception Sequence and known frequency domain sequence carry out predetermined operation and carry out inversefouriertransform again, and the anti-Fourier based on some groups of shift values becomes Change result and obtain corresponding relation between the shift value and the integer frequency offset estimation value, be derived from integer frequency offset and estimate Evaluation.

Alternatively, complete after the integer frequency offset estimation, solved after being compensated to frequency deviation and then to transmission signaling Analysis.

Alternatively, complete after the integer frequency offset estimation, first at least one described time domain main running signal When the time domain main running signal does not transmit signaling for Given information, the accurate Timing Synchronization side is carried out using the known signal Formula.

Alternatively, the channel estimation mode, is contained in the step of being parsed to transmission signaling, including：When upper one After the time domain main running signal decoding terminates, by the use of resulting decoding information as information is sent, enter again in time domain/frequency domain Row channel estimation, and certain certain operations is carried out with channel estimation results before, new channel estimation results are obtained, under being used for The channel estimation of the signaling resolution of one time domain main running signal.

The embodiment of the present invention also each provides the life with the leading symbol corresponding to above-mentioned generation method and method of reseptance Into device.

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

The generation method and method of reseptance of the leading symbol provided according to embodiments of the present invention, the generation dress of leading symbol Put and reception device, because multiple three-stage structures of leading symbol any one or independent assortment are produced, each three sections of symbols Main part can transmit signaling in spatial structure and frequency-domain structure respectively, in time domain, can be realized using three-stage structure Coherent demodulation, at the same further through suffix or it is advanced sew the problem of implementation frequency modulation is to solve mono-tone interference, further through two kinds The problem of different three-stage structures solves the small inclined estimation failure under dangerous delays；In addition on frequency domain, by based on different Sequence production and/or produced based on same sequence production the sequence of the generation is further subjected to cyclic shift generation frequency domain Subcarrier, optionally further combined with to the pre-generatmg subcarrier obtained by processing according to frequency deviation value carry out phase-modulation, with Raising system efficiency of transmission.Further, the time domain main running signal in first time-domain symbol can use known symbol, for making The initial synchronisation and channel estimation detected to be concerned with, while can be needed neatly to select time-domain symbol in leading symbol according to system Number transmit required signaling.

Brief description of the drawings

Fig. 1 is the schematic flow sheet of the embodiment one of the generation method of the leading symbol of the present invention；

Fig. 2 is the spatial structure schematic diagram of physical frame in embodiments of the invention；

Fig. 3 is the Physical Frame Structure signal comprising form control section and content-control part in embodiments of the invention Figure；

Fig. 4 be embodiments of the invention leading symbol in frequency domain schematic diagram corresponding to a time-domain symbol；

Fig. 5 is the schematic diagram of the first three-stage structure in embodiments of the invention；

Fig. 6 is the schematic diagram of second of three-stage structure in embodiments of the invention；

Fig. 7 is the schematic flow sheet of the embodiment two of the generation method of the leading symbol of the present invention；

Fig. 8 is the schematic flow sheet of the embodiment of the method for reseptance of the leading symbol of the present invention；

Fig. 9 is using 4 groups of accumulated correlation values of 4 time-domain symbols to obtain the logic of preliminary Timing Synchronization result in the present invention Computing block diagram；And

Figure 10 is using 2 groups of accumulated correlation values of 2 time-domain symbols to obtain patrolling for preliminary Timing Synchronization result in the present invention Collect computing block diagram.

Embodiment

Inventor has found that leading symbol has efficiency of transmission not high in prior art, and not enough, initial timing is same for transmission flexibility ratio Walk performance bad, it is impossible to implement relevant decode so that the problem of decoding performance is not good such under low signal-to-noise ratio.

In view of the above-mentioned problems, inventor passes through research there is provided a kind of generation of leading symbol and method of reseptance, this is leading The design of symbol not only improves the Timing Synchronization performance of leading symbol, while the characteristics of using cyclic prefix, it is possible to implement phase Dry decoding, the problem of improving receptivity in most cases.Meanwhile, time domain and frequency domain all transmit signaling, and frequency domain leads to Cross a variety of methods and implement signalling, and time domain can implement urgent broadcast mark.Meanwhile, by neatly using time-domain symbol Number come realize need transmit signaling, needed with applicable system, realize transmission flexibility and scalability.Meanwhile, pin To the generation method of the leading symbol of the present invention, corresponding receiving algorithm is specifically described, these receiving algorithms can be with relatively low Ground complexity realizes the performance of very robust.

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 embodiment is described in detail.

Fig. 1 is the schematic flow sheet of the embodiment of the generation method of the leading symbol of the present invention.As shown in figure 1, this implementation The generation method of leading symbol, comprises the following steps in example：

Step S1-1：Based on frequency domain subject sequence column-generation subcarrier in frequency domain；

Step S1-2：Inversefouriertransform is carried out to subcarrier in frequency domain and obtains time domain main running signal；And

Step S1-3：Leading symbol is generated based on the time-domain symbol that time domain main running signal is formed by least one.

Wherein, the step of generating subcarrier in frequency domain includes：(1) it is used for the predetermined sequence generation rule for generating frequency domain main body sequence Then；And/or (2) carry out the predetermined process rule that processing is used to generate subcarrier in frequency domain to frequency domain main body sequence,

(1) predetermined sequence create-rule includes the following combination of any one or two kinds：

(1a) is produced based on different sequence productions；And/or

(1b) is produced based on same sequence production, and the sequence of the generation further is carried out into cyclic shift,

(2) predetermined process rule is included：To the pre-generatmg subcarrier obtained by being handled based on frequency domain main body sequence according to Frequency deviation value carries out phase-modulation.

Fig. 2 is the spatial structure schematic diagram of physical frame in embodiments of the invention.

As shown in Fig. 2 this implementation, which is disclosed, just shows two physical frames in a kind of frame structure, Fig. 2, each physical frame point Not Bao Han leading symbol and data area, wherein, leading symbol be located at data area before.

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

Whether what leading symbol was used to rapidly detect to determine to transmit in channel is to expect the signal that receives there is provided basic Configured transmission (such as FFT points, frame type information), makes receiving terminal to carry out receipt of subsequent processing；Detect original carrier Frequency deviation and timing error, to reach frequency and Timing Synchronization after compensating；Urgent broadcast wake-up etc..

Fig. 3 is the Physical Frame Structure signal comprising form control section and content-control part in embodiments of the invention Figure.

As shown in figure 3, 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 Include PFC parts and PCC parts.

Form control section PFC is constituted by one or more time-domain symbols and (oblique wire frame representation is used in figure), during each OFDM Domain symbol size is identical.In the present embodiment, time-domain symbol uses OFDM symbol.

Fig. 5 is the schematic diagram of the first three-stage structure in embodiments of the invention；It is in embodiments of the invention with Fig. 6 The schematic diagram of two kinds of three-stage structures.

At least one time-domain symbol is included in the form control section PFC of leading symbol, because time domain is accorded with the present embodiment The first following three-stage structure or second of 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. 5 and Fig. 6, in the present embodiment one, time-domain symbol has following three-stage structure：Such as first in Fig. 5 Plant three-stage structure：Prefix (C sections) that time domain main running signal (A sections), the rear portion based on the time domain main running signal are generated, Yi Jiji The suffix (B sections) of part generation is chosen in prefix ranges in time domain main running signal；Such as second of three-stage structure in Fig. 6： 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 sewed (B sections).

By one section of time domain main running signal (being indicated in figure using A) 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 to generate Part III in figure with C Show) so that as prefix, meanwhile, take out a part, predetermined process progress from the rear portion of Part I according to the predetermined rule that obtains Handle and copy to the rear portion of the Part I or processing and copy to the front portion of prefix to 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 5 as suffix the first three Segment structure (CAB structures) and B are used as second of the three-stage structure (BCA structures) as shown in Figure 6 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 the time-domain symbol with second of three-stage structure；If or in no particular order arranging The freedom of the dry time-domain symbol with the first three-stage structure and/or several time-domain symbols with second 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 Several CAB and several BCA any independent assortment arranged in no particular order.It should be strongly noted that before the present invention Lead symbol but be not limited to a structure for including C-A-B or B-C-A, also can also include other spatial structures, such as tradition CP knots Structure etc..

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

If N_AFor A length, if Len_CFor C length, Len_BFor modulated signal section B length.If A sampled point sequence number For 0,1 ... N_A- 1. set the sampled point that N1 is copied to the modulated signal section Part II B corresponding Part I A of starting point as selection Sequence number, N2 is copied to the modulated signal section Part II B corresponding Part I A of terminal sampled point sequence number for selection.Wherein,

N2=N1+Len_B- 1 (formula 1)

Generally, frequency modulation is modulated to B sections of implementations of Part II, M sequence or other sequences etc. is modulated, in this implementation By taking frequency modulation as an example, if P1_A (t) is A time-domain expression, 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_AFor the length of time-domain OFDM symbol, such as, N_AFor 1024, f is taken_SH=1/ 1024T, and frequency modulation can arbitrarily select first phase.In order that correlation peak is sharp, f_SHIt can also select as 1/ (Len_BT) or Close to the numerical value of its value.

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

First sampling of Part II (B) starting point corresponding to Part I (A) will be chosen in the first three-stage structure (CAB) Point sequence number is set to N1_1, corresponds to Part I (A) by Part II (B) starting point is chosen in second of three-stage structure (BCA) Second sampled point sequence number, which 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 contents 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 contents 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 being frequency modulation to the modulation of B sections of uses, the frequency deviation value f of two kinds of structures_SHContrast is wanted, beneficial to reception Machine is realized.

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 A2 time-domain expression, 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 of three-stage structure arranged in no particular order, the difference according to priority can divide Do not form different by several the first three-stage structures and/or the leading character of several second of three-stage structure independent assortments Number.Citing below provides the time-domain expression of the first leading symbol sequentially for 1 C-A-B and 1 B-C-A, and is sequentially 1 The time-domain expression of individual B-C-A and 1 C-A-B the second leading symbol.

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

The time-domain expression of 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.

As in above-mentioned situation, when C-A-B structures and the cascade of B-C-A structures, small inclined estimation under dangerous delays can be solved The problem of failure.When dangerous delays cause C sections and A sections counteractings, the BC sections of the CB sections of first structure and second structure are still So for Timing Synchronization and it can estimate small partially.

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

(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_AFor 2048, if Len_CFor 520, Len_B=504, N1_1= 1544, N1_2=1528, the expression formula that P1_A (t) is time domain main body A is made, then can derive C-A-B and B-C-A time domain table It is up to formula

And

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

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

Understand that time domain main running signal A passes through based on frequency domain main body sequence with reference to the generation step of Fig. 1 above-mentioned leading symbol Generation subcarrier in frequency domain carries out inversefouriertransform IFFT and obtained.Formed again by time domain main running signal A with C-A-B or B-C-A The time-domain symbol of such three-stage structure, so that being formed in the present embodiment has the leading symbol of at least one time-domain symbol.

Explanation is described to the generating process in the time domain main running signal A of three-stage structure (CAB or BCA) below.

Fig. 4 be embodiments of the invention leading symbol in frequency domain schematic diagram corresponding to a time-domain symbol.

As shown in figure 4, the subcarrier in frequency domain generation of a time-domain symbol in the PFC of leading symbol is given, based on frequency domain Main body sequence obtains the subcarrier in frequency domain.

In the generation of subcarrier in frequency domain, comprising for generate frequency domain main body sequence predetermined sequence create-rule and/or The predetermined process rule that processing is used to generate subcarrier in frequency domain is carried out to frequency domain main body sequence.

For predetermined sequence create-rule, the generating process of frequency domain main body sequence is more flexible, predetermined sequence life The following combination of any one or two kinds is included into rule：Produced based on different sequence productions；And/or based on the life of same sequence An accepted way of doing sth is produced, and the sequence of the generation further is carried out into cyclic shift.In the present embodiment, using permanent envelope zero auto-correlation sequence (CAZAC sequences) is realized, that is to say, that above-mentioned different sequence production is by assigning same CAZAC sequences different roots Obtain or, above-mentioned same sequence production is obtained by assigning the same root of CAZAC sequences.

Frequency domain main body sequence is generated based on one or more CAZAC sequence, and frequency domain main body sequence has predetermined sequence long Spend N_ZC.Predetermined sequence length N_ZCThe Fourier transformation length N that no more than time domain main running signal has_FFT。

Processing filling step is carried out to frequency domain main body sequence, included on the whole：With reference to predetermined sequence length N_ZCBy frequency domain Main body sequence is mapped to positive frequency subcarrier and negative frequency subcarrier；With reference to Fourier transformation length N_FFTIn positive frequency subcarrier The virtual subcarrier and direct current subcarrier of predetermined number are filled with negative frequency subcarrier outward flange；And carry out gained subcarrier Ring shift left so that zero subcarrier corresponds to first position of inversefouriertransform.

Here, enumerating the example based on a CAZAC sequences generation.Firstly generate N_ZCThe frequency domain main body sequence of length (Zadoff-Chu, sequence, ZC), is one kind of CAZAC sequences,

If sequence formula is：

Note N_ZCN can be equal to or less than_root, you can it is complete or cut by the complete Zadoff-Chu sequence of a certain root It is short to produce, the PN sequences to one same length of this ZC sequence modulation then may be selected, ZC_M sequences are obtained, by ZC_M sequences point Into two parts, left-half length isNegative frequency part is mapped to, right half part length isIt is mapped to just Frequency-portions, N_ZCA certain natural number, no more than A sections FFT length may be selected；In addition, at the edge of negative frequency, fillingThe zero of number, and at the edge of positive frequency, fillThe zero of number, is virtual subcarrier； Therefore, the particular sequence be byIndividual zero,The ZC sequences of individual PN modulation, 1 direct current subcarrier,The ZC sequences of individual PN modulation andIndividual zero order is constituted；Effective number of sub carrier wave is N_ZC+1

。

The specifically generating process of frequency domain main body sequence, such as sequence formulaIf can choose Dry different root q, the sequence generated for each root q can carry out different cyclic shifts again again and obtain more multisequencing, By this 2 kinds of modes it is one of any or two transmit signaling

Such as, 256 root q are taken, 256 sequences are obtained, you can 8 bits of transmission, based on 2^8=256, and shift value It is set as 1024, then each sequence in 256 can carry out 0-1023 displacement again, i.e., each sequence passes through 1024 kinds of displacements The signalling of 10 bits is realized again, based on 2^10=1024, thus can transmit 8+10=18 bit signallings altogether.

These protocol mappings are to bit field, and the signaling transmitted can include the frame format parameter for being used for indicating physical frame And/or for indicating emergency broadcasted content, wherein, frame format parameter is such as：Frame number, frame length, the bandwidth of PCC symbols, data The bandwidth in region, the FFT sizes and protection interval length of PCC symbols, PCC modulation and coding parameter.

Cyclic shift in above-mentioned predetermined sequence create-rule can be placed on to be carried out carrying out before PN sequence modulations to ZC sequences, Progress after PN sequence modulations can also be placed on, in addition, for the frequency domain master corresponding to time domain main running signal each described Body sequence is carried out identical between the PN sequences of the PN modulation or differed.

Wherein, if first time domain main running signal uses previously known frequency domain main body at least one time domain main running signal Sequence, then the frequency domain main body sequence and corresponding frequency deviation value are not used in transmission signaling, and PFC in follow-up time-domain symbol is transmitted Signaling.

Frequency domain main body sequence (ZC sequences) used in last OFDM symbol and the frequency domain used in first OFDM symbol The phase difference 180 degree of main body sequence (ZC sequences), this is used to refer to PFC last OFDM symbol；First in PFC The ZC sequences that OFDM symbol is used, generally root sequence of certain length without cyclic shift, and under the length, ZC sequences have one Individual set, therefore the present invention, from a certain sequence in this set, this can indicate a certain information, such as version number or indicated number According to the type of service or pattern transmitted in frame；In addition, utilizing the corresponding root and/or use in first time domain main running signal Information is transmitted in the initial phase for the PN sequences for carrying out PN modulation, PN initial phase also has certain signalling capability, for example, referred to Show version number.

Here, enumerating the example generated based on multiple CAZAC sequences.Each CAZAC sequences have corresponding subsequence respectively Length L_M, there is sub-sequence length L according to the generation of above-mentioned predetermined sequence create-rule to each CAZAC sequences_MSubsequence, will Multiple subsequences are spliced into predetermined sequence length N_ZCFrequency domain main body sequence.

Specifically, in the generation of the effective subcarrier of frequency domain, it is made up of M CAZAC sequence, if M CAZAC sequence Length is respectively L₁,L₂,...L_M, and meetThe generation method of each CAZAC sequences and above-mentioned identical, only increases Plus a step, after M CAZAC sequence is generated, it is N to be spliced into length_ZCSequence, may be selected after PN sequence modulations formed ZC_M, then carry out after frequency-domain-interleaving, forms new ZC_I, then fills out and be placed on above-mentioned identical sub-carrier positions, left-half length ForNegative frequency part is mapped to, right half part length isIt is mapped to positive frequency part, N_ZCIt may be selected a certain Natural number, no more than A sections FFT length；In addition, at the edge of negative frequency, fillingThe zero of number, and in positive frequency The edge of rate, is filledThe zero of number, is virtual subcarrier；Therefore, the particular sequence be byIndividual zero,The ZC sequences of individual PN modulation, 1 direct current subcarrier,The ZC sequences of individual PN modulation WithIndividual zero order is constituted, wherein, the step for modulating PN can also be placed on progress after frequency-domain-interleaving.

Sub-carrier positions filling can also take other to handle filling step, not limit here.

Gained subcarrier will be filled by above-mentioned processing and carries out ring shift left, it is similar after the later half frequency spectrum of progress first half is exchanged Fftshift in Matlab, i.e., correspond to zero subcarrier first position of discrete inversefouriertransform, made a reservation for Length N_FFTFrequency-domain OFDM symbol pre-generatmg subcarrier.

Further, in the subcarrier in frequency domain generating process of this implementation, except preferably using above-mentioned predetermined sequence Create-rule, can be also preferably used in handle frequency domain main body sequence and be advised with the predetermined process for generating subcarrier in frequency domain Then.The present invention does not limit using any one or two in predetermined process rule and predetermined sequence create-rule to form frequency domain Subcarrier.

Predetermined process rule is included：Phase-modulation is carried out according to frequency deviation value S to pre-generatmg subcarrier, wherein, the pre-generatmg Subcarrier is obtained by above-mentioned to steps such as frequency domain main body sequence progress processing filling, ring shift lefts.In the predetermined process In rule, the subcarrier in frequency domain corresponding to same time domain main running signal A is using same frequency deviation value S to each in the subcarrier in frequency domain Effective subcarrier carries out phase-modulation, the frequency deviation value difference S that the subcarrier in frequency domain corresponding to different time domain main running signal A is utilized.

For predetermined process rule specifically, such as the subcarrier expression formula of former OFDM symbol is

a₀(k) k=0,1,2 ... N_FFT- 1,

(formula 12) It is then as follows to the expression formula of each subcarrier progress phase-modulation by a certain frequency deviation value such as s：

Wherein, the operation that zero carrier is multiplied is actual without carrying out, and only effective subcarrier need to be operated.Frequency deviation value s can The scope of selection is [- (N_FFT-1),+(N_FFT- 1) integer], frequency deviation value s is become based on the Fourier that time domain main running signal has Change length N_FFTIt is determined that, its different value can be used for transmitting signaling.

It should be noted that above-mentioned also may be used by the frequency deviation value S implementation methods for carrying out phase-modulation to each pre-generatmg subcarrier Realized in time domain.It is equivalent to：The frequency-domain OFDM symbol of original unmodulated phase is obtained into time domain ODFM symbols through IFFT conversion, Time-domain OFDM symbol can be carried out generating time domain main running signal A after cyclic shift, letter is transmitted by different cyclic shift values Order.In the present invention, carry out phase-modulation to each effective subcarrier to be described by a certain frequency deviation value in a frequency domain, it shows And the time domain equivalent operating method being clear to is also within the present invention.

In summary, the present embodiment can be entered in the generating process of subcarrier in frequency domain based on frequency domain main body sequence selection It is any one in the above-mentioned predetermined sequence create-rule (1a) of row and predetermined sequence create-rule (1b) and predetermined process regular (2) It is individual or at least two independent assortment.

For example, signaling is transmitted using the generation method of the leading symbol of regular (1a).

Root q described by such as upper example takes 256 kinds, and each root q cyclic shift value takes 0-1023, then can transmit 8+10 =18 bit signallings.

For another example, for example, transmit signaling with the generation method of regular (1a) and the leading symbol of regular (2).

Root q takes 2 kinds, and time-domain OFDM symbol length is 2048, takes 1024 kinds of shift values, is interval with 2, such as and 0,2,4, 6 ... .2046 etc., transmit 1+10=11 bit signallings.

For another example, for example, only with the generation method of the leading symbol of regular (2).

Root q is fixed, and phase-modulation is carried out by different frequency deviation value S to subcarrier in frequency domain, than such as above-mentioned N_FFTFor 2048,K=0,1,2 ... N_FFT- 1 s values 0,8,16 ... 2032 etc., are equivalent to and are adjusted without phase The frequency-domain OFDM symbol of system carries out the time-domain OFDM symbol after IFFT, carries out the cyclic shift of 256 kinds of different shift values, is with 8 Interval, such as 0,8,16 ... 2032 etc., transmit 8 bit signallings.Here, the present invention does not limit moving to left or right for cyclic shift Move, when s is positive number, correspondence time domain cyclic is moved to left, such as value is 8, and 8 are moved to left corresponding to time domain cyclic；When s is negative, Correspondence time domain cyclic is moved to right, such as value is -8, and 8 are moved to right corresponding to time domain cyclic.

The present invention's additionally provides a kind of method of reseptance of leading symbol embodiment two.Fig. 7 is the leading symbol of the present invention Generation method embodiment two schematic flow sheet.

As shown in fig. 7, in the present embodiment leading symbol generation method, comprise the following steps：

Step S2-1：Time-domain symbol with following three-stage structures is generated based on time domain main running signal；And

Step S2-2：Leading symbol is generated based at least one time-domain symbol.

Wherein, the first three-stage structure in three-stage structure is included：The time domain main running signal, the neat time domain main body letter Number end choose the prefix of part generation and choose a part in the prefix ranges based on the time domain main running signal The suffix of generation；Second of three-stage structure in three-stage structure is included：The time domain main running signal, the neat time domain main running signal Choose the prefix of part generation and choose part life in the prefix ranges based on the time domain main running signal in end Into it is advanced sew,

Leading symbol is included：The time-domain symbol with the first three-stage structure；Or with described second three The time-domain symbol of segment structure；Or arrange in no particular order several have the first three-stage structure time-domain symbol and/or Several have the independent assortment of the time-domain symbol of second of three-stage structure.

The present embodiment two have with implement one in corresponding technology essential factor for example the first three-stage structure, second three The specific configuration of segment structure, omits identical explanation herein.

Embodiments of the invention additionally provide a kind of method of reseptance of leading symbol.Fig. 8 is the leading symbol of the present invention The schematic flow sheet of the embodiment of method of reseptance.

As shown in figure 8, the method for reseptance of the leading symbol in the present embodiment, comprises the following steps：

Step S3-1：The physical frame received is handled to obtain baseband signal；

Step S3-2：Judge to receive with the presence or absence of expectation in baseband signal and the leading character that method is generated is generated as described above Number；

Step S3-3：Determine position in physical frame of received leading symbol and solve entrained by the leading symbol Signaling information.

During step S3-2 judges the baseband signal with the presence or absence of expect receive the leading symbol when, using with Any one lower mode or any at least two modes independent assortment carry out reliability judgement：It is initial timing synchronization mode, whole Several times offset estimation mode, accurate Timing Synchronization mode, channel estimation mode and decoded result analysis mode.

Step S3-2 includes initial timing synchronization mode, for primarily determining that position of the leading symbol in physical frame. Further, after initial synchronisation, can also the result based on initial timing synchronization carry out small inclined estimation.In addition, further, initially After synchronization, it is also based on the result obtained by the initial timing synchronization mode and carries out the integer frequency offset estimation mode.

First time domain main running signal signaling is not transmitted into for known letter when the leading symbol generation method of transmitting terminal is used During breath, (1.) initial timing synchronization mode it should include：Calculus of differences is carried out by first time-domain symbol, and by Given information pair The time domain sequences answered also carry out calculus of differences, then both are carried out into cross-correlation obtain cross correlation value, based on one or many obtained Individual cross correlation value, at least carries out initial synchronisation based on this result.

Next the integer frequency offset estimation mode based on initial timing synchronization result is illustrated, is carrying out integral multiple In the step of offset estimation, including any one in following two modes or two kinds of combinations：.

First integer frequency offset estimation mode is included：Using sweep method to all or part of time domain waveform for intercepting out After being modulated with different frequency deviations, several frequency sweep time-domain signals are obtained, Fourier inversion will be carried out by known frequency domain sequence The known time-domain signal of gained and each frequency sweep time-domain signal enter line slip it is related after, the frequency sweep time domain of maximum correlation peaks is believed Number frequency deviation value modulated is integer frequency offset estimation value；And/or

Second integer frequency offset estimation mode is included：Believe main body time domain is intercepted according to the position result of initial timing synchronization Number subcarrier in frequency domain carried out obtained by Fourier transformation carries out cyclic shift in swept frequency range by different shift values, and interception is effective Receiving sequence corresponding to subcarrier, carries out predetermined operation to the receiving sequence and known frequency domain sequence and carries out anti-Fourier's change again Change, the inversefouriertransform result based on some groups of shift values obtains the correspondence pass between shift value and integer frequency offset estimation value System, is derived from integer frequency offset estimation value.

Citing specifically describes whole inclined estimation mode below, can be carried out using the Given information of first symbol of PFC whole inclined Estimation and initial channel estimation, it is necessary to for the Given information of first symbol.

First integer frequency offset estimation mode, the position that the leading symbol detected according to initial timing synchronization occurs, cuts The all or part of the time domain waveform of the leading symbol received is taken, by the way of frequency sweep, i.e., is become with fixed frequency Change step footpath, such as correspond to integer frequency offset interval, the part time domain waveform is modulated after upper different frequency deviation, when obtaining several Domain signal

Wherein, T is sampling period, f_sFor sample frequency.And known frequency domain sequence is laggard by pre- subcarrier filling mode The corresponding time-domain signal of row inverse fourier transform is A2, regard A2 as known signal and each A1_yEnter line slip related, select That A1 of existing maximum correlation peaks_y, then the frequency deviation value y modulated to it is integer frequency offset estimation value.

Wherein, the frequency deviation region of confrontation required for swept frequency range correspondence system, than the frequency deviation if desired for the positive and negative 500K of confrontation, And systematic sampling rate is 9.14M, leading symbol main body is 2K length, then swept frequency range isI.e. [- 114, 114]。

Second integer frequency offset estimation mode：The position that the leading symbol detected according to initial timing synchronization occurs, cuts Main body time-domain signal A is taken, and carries out FFT, the circulation that the subcarrier in frequency domain after FFT is carried out to the different shift values of swept frequency range is moved Position, then intercepts and receiving sequence is obtained corresponding to effective subcarrier, certain computing is carried out with receiving sequence and known frequency domain sequence (logical Often it is conjugate multiplication, or is divided by), its result is subjected to IFFT, the result to IFFT carries out certain operations, such as takes maximum diameter Energy, or take some big footpath energy accumulations.So several shift values, after IFFT several times, obtain one every time Operation result, then can obtain some groups of operation result.Judge which shift value has corresponded to integer based on this some groups of results Times offset estimation, thus obtains integer frequency offset estimation value.

Common determination methods are that maximum corresponding shift values of group of selection energy based on some groups of result, as Integer frequency offset estimation value.

The specific algorithm of integer frequency offset estimation has many kinds, repeats no more.

In addition, utilizing known frequency domain sequence in first comprising the Given information symbol received and first symbol And/or it carries out the corresponding time-domain signal of inverse fourier transform and completes channel estimation, can equally select to carry out in time domain and/or Carried out in frequency domain, including can be not reinflated here with time-frequency combination computing.

Further, complete after above-mentioned integer frequency offset estimation, carried out after being compensated to frequency deviation and then to transmission signaling Parsing.

Further selectively, complete after integer frequency offset estimation, first at least one time domain main running signal When time domain main running signal does not transmit signaling for Given information, accurate Timing Synchronization mode is carried out using the known signal.

Channel estimation mode is included in the step of being parsed to transmission signaling, the channel estimation mode includes：When upper After one time domain main running signal decoding terminates, by the use of resulting decoding information as information is sent, enter again in time domain/frequency domain Row channel estimation, and certain certain operations is carried out with channel estimation results before, new channel estimation results are obtained, under being used for The channel estimation of the signaling resolution of one time domain main running signal.

Further, after frame format parameter and/or urgent broadcast content is solved, according to content of parameter and it can have determined that The position of PFC symbols subsequently parses PCC symbols to obtain the position of PCC symbols or the position of data symbol and be based on this progress Or data symbol.

More in particular, for as in embodiment two with unlimited any combination CAB or BCA from For the leading symbol for the three-stage structure being defined in time domain angle：

In receiving terminal for receiving above-mentioned such leading symbol, (2.) initial timing synchronization mode includes：Work as detection When having three-stage structure to time-domain symbol, peculiar using each CAB and/or BCA is dealt with relationship and/or modulation relation is prolonged Auto-correlation is slided late carries out specific mathematical to obtain one or more groups of cumulative correlations, then based on one or more groups of correlations After computing, preliminary Timing Synchronization is at least carried out based on operation result value.

For such leading symbol, when transmitting terminal utilizes the difference for choosing Part II in Part I to rise During point mark urgent broadcast, initial timing synchronization is parsed urgent wide by following any one or any two kinds of phase independent assortments Broadcast：The different delays relation of identical content between Part III and Part II；And phase between Part I and Part II With the different delays relation of content, urgent broadcast and common broadcast are sent to distinguish.

Further, when sending the PFC in leading symbol simultaneously comprising following two situations (a) with (b),

(a) first time domain main running signal at least one time domain main running signal described in is not used in transmission signaling Given information；

(b) and detect the time domain main running signal there is the three-stage structure,

By any one in above-mentioned (1.) initial timing synchronization mode and (2.) initial timing synchronization mode or Two kinds are combined to complete initial timing synchronization.Wherein when being completed based on two kinds, then by (1.) initial timing synchronization mode institute The the second preliminary synchronisation operation values obtained by the first preliminary synchronisation operation values and (2.) initial timing synchronization mode obtained are carried out again Ranking operation, initial timing synchronization is completed based on the ranking operation value.

Illustrate to primarily determine that leading symbol position in physical frame with reference to specific method data and operational formula Method.

[(1.) initial timing synchronization mode]

Wherein, when first symbol of PFC does not transmit signaling, when being known signal, (1.) initial timing synchronization mode can Calculus of differences is carried out by first symbol of PFC, the corresponding time-domain signal of Given information calculus of differences is also subjected to, then incite somebody to action both Cross-correlation is carried out, initial synchronisation is carried out based on the related result of one or more groups of difference, primarily determines that leading symbol in physical frame Position.

The related detailed process of difference in (1.) initial timing synchronization mode is described below, and single group difference phase is introduced first The process of pass.

Difference value is determined, calculus of differences of the base band data progress by difference value will be received, by the sheet corresponding to Given information Ground time domain sequences also carry out the calculus of differences by difference value, and the result of the two calculus of differences then is carried out into cross-correlation again, obtained To the difference correlated results corresponding to the difference value.The calculating process of the difference correlated results of this single group is prior art.If poor Score value is D, and reception base band data is r_n, each specific formula of step is described as follows；

First, calculus of differences of the base band data progress by difference value will be received

After calculus of differences, the phase place that carrier wave frequency deviation is brought becomes fixed carrier phase e^j2πDΔf, Δ here F represents carrier frequency offset.

Local time domain sequences are also subjected to calculus of differences simultaneously

Then the reception data after difference and local difference sequence are subjected to cross-correlation, obtained

There is no multipath in system, also in the case of no noise,

Relevant peaks can be provided well, and peak value is not by carrier wave deviation effects.Frame synchronization/timing synchronization position profit Obtained with such as following formula

It was found from above-mentioned single group difference related operation process, difference related algorithm can resist the shadow of arbitrarily large carrier wave frequency deviation Ring, but be due to that receiving sequence is first subjected to calculus of differences so that signal noise strengthens, and under low signal-to-noise ratio, noise increases It is very serious by force, cause signal to noise ratio significantly to deteriorate.

In order to avoid above mentioned problem, therefore more than single group difference related operation, multigroup difference correlation can be implemented, such as N's Value is 64, implements 64 groups of difference correlations, obtainsWherein D (0), D (1) ..., D (N-1) are choosing The N number of different difference value selected.

Specific mathematical computing is carried out to N number of result, final correlated results is obtained.

In the present embodiment, for multigroup difference related (64 groups) according to the selected process made of predetermined difference selected rule, Can the performance requirement based on Transmission system using any one in following two：

(1) first predetermined difference selected rule：Difference value D (i) arbitrarily selects N number of different value and meets D (i) ＜ L, wherein L is the length of the corresponding local time domain sequences of Given information.

(2) second predetermined difference selected rules：Difference value D (i) selects N number of different value for arithmetic progression and meets D (i) ＜ L, i.e.,K is satisfactionNormal integer, wherein L is the corresponding local time domain sequences of Given information Length.

To this N number of (64) progress predetermined process computing of result, final correlated results is obtained, predetermined process computing here Preferred embodiment have two kinds, be illustrated respectively.

The first predetermined process computing：

Difference value D (i) can arbitrarily select N number of different value, meet D (i) ＜ L.Because, the optional difference value D of institute (i) the phase e after, every group of difference is related^j2πD(i)ΔfI=0 ..., N-1 are different, it is impossible to direct vector addition, so only Being capable of weighted absolute value addition or average.Predetermined process computing is carried out to N number of different difference correlated results by below equation, Obtain final difference result.Following formula is that absolute value is added the example for obtaining final difference result.

Second of predetermined process computing：

Difference value D (i) can arbitrarily select N number of different value, meet D (i) ＜ L, and meet D (i) for arithmetic progression, i.e. D (i+1)-D (i)=K, K are satisfactionNormal integer.

By this rule selection difference value, obtain asDifference correlation after, then will be adjacent 2 groups of difference correlations carry out conjugate multiplication, and the value after N-1 group conjugate multiplications is obtained by below equation.

Because, by this conjugate multiplication by originally every group of different phase e^j2πD(i)ΔfBecome identical e^j2πKΔf, institute With the N-1 groups RM obtained by equation 8 below_i,mVector addition can be weighted or final difference result is averagely obtained, with To than the first predetermined process computing better performance.Following formula is the example that vector addition obtains final difference result.

It should be noted that when difference value D (i) is, using in the case of the above-mentioned second predetermined difference selected rule, not only may be used Matching states acquisition conjugate multiplication value in second of predetermined process computing and is weighted vector addition again or is averaged to obtain most last phase Result is closed, can also be matched according to exhausted by weighting directly at least two difference correlated results in above-mentioned first predetermined process computing Value is added or is averaged to obtain final correlated results.

So as to based on computing R_dc,mPrimarily determine that leading symbol in the position of physical frame.

[(2.) initial timing synchronization mode]

Wherein, it is peculiar using C-A-B and/or B-C-A when leading symbol has C-A-B or B-C-A spatial structure Deal with relationship and/or modulation relation, carry out delay slip after necessary inverse processing and/or signal demodulation are carried out to baseband signal Auto-correlation obtains 1 group or multigroup accumulated correlation values, then based on one or more groups of accumulated correlation values carry out delay 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, it is as follows that auto-correlation acquisition accumulated correlation values formula is slided in delay：

It may be selected to U₁' (n) carry out energy normalized obtain U_1s'(n)。

I.e.

Energy normalized can also take other method, U₁(n) conjugate operation * is taken in, can also be realized by r (n), and r (n- N_A) conjugation is not taken.

In each C-A-B or B-C-A structure, CA, AB and the CB tri- based on identical content can be obtained respectively and is added up Correlation.

For example, here only with C-A-B structure examples, B-C-A can be pushed away accordingly.

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

Enter line slip delay using the B sections of parts for only modulating frequency deviation identical with C sections related：

Enter line slip delay using the B sections of parts for only modulating frequency deviation identical with A sections related：

Wherein, corr_len can use 1/f_SHT, to avoid continuous wave CO_2 laser, or takes Len_BTo cause peak value sharp.

And when leading symbol includes multiple three-stage structures, can obtain tri- accumulated correlation values of multigroup CA, AB and CB, i.e., it is many Group U_ca' (n), U_cb' (n), U_ab' (n), based on one group in many class values and multigroup progress delay relationship match and/or mathematics fortune Calculate, obtain last operation values, the operation values are used for initial synchronisation.

Such as, for preferred 4 have three-stage structure time-domain symbols for, its be arranged as C-A-B, B-C-A, When C-A-B, B-C-A, obtain

Then can be byOne or more of carry out delay relationship match and/ Or be added or be averaged again after phase adjustment, obtain last U_ca(n).Because they have identical phase value. Delay matching is exemplified below：

And

Can be byOne or more of carry out delay relationship match and/or It is added or is averaged again after phase adjustment, obtains last U_cb-ab(n).Because they have identical phase value. Delay matching is exemplified below：

And

Can be byOne or more of carry out delay relationship match and/or It is added or is averaged again after phase adjustment, obtains last U_ab-cb(n).Delay matching is exemplified below：

And

Finally, based on U_caAnd U (n)_cb-abAnd U (n)_ab-cb(n) one or more carry out delay matching and carried out specific again Computing, delay matching here is exemplified below：

U_ca(n), U_cb-ab(n),U_ab-cb(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 delay number plus-minus one of correlator, formation postpones numbers with three after plus-minus one in itself, according to these three delay numbers Implement to slide delay auto-correlation, reselection correlated results it is the most obvious that, while it is estimated that timing offset.

Fig. 9 just gives the preliminary Timing Synchronization result of 4 groups of accumulated correlation values acquisition using 4 time-domain symbols in this implementation Logical operation block diagram；And 2 groups of accumulated correlation values acquisition that Figure 10 is just given in this implementation using 2 time-domain symbols is preliminary The logical operation block diagram of Timing Synchronization result.

It is not in general manner, if when removing the structure with C-A-B or B-C-A in leading symbol, also comprising other time domains During characteristic, except the time synchronization method of the design feature using above-mentioned C-A-B or B-C-A, then it is superimposed with for other time domains Other time synchronization methods that design feature is implemented, without departing from spirit described in the invention.

Further, it is preliminary to complete after initial timing synchronization, determined using (1.) mode and/or the preliminary of (2.) mode When synchronized result can also carry out fractional part of frequency offset estimation.

For the algorithm estimated for fractional part of frequency offset, concrete example, when Timing Synchronization mode preliminary using (1.),I=0 ... N-1, its maximum is taken, corresponding phase is e_j2πKΔf, Δ f can be calculated and corresponding is converted into 1 small bias.

Again for concrete example, when (2.) preliminary Timing Synchronization mode, U is taken_ca(n) angle of maximum in, finally Go out the 2nd small bias, then by U_cb-abAnd U (n)_ab-cb(n) after conjugate multiplication, the corresponding angle of maximum is also taken, the 3rd can be calculated small Bias.As above the angle in logical operation block diagram is used to seek small inclined schematical sections, can be based on the 2nd small bias, the 3rd small bias One of any sum it two carry out small inclined estimation.

Included simultaneously needed for (1.) and (2.) preliminary Timing Synchronization mode is implemented when sending the PFC in leading symbol During feature, based on the 1st, the 2nd, one of any or any two combination at least of the 3rd small bias obtain small inclined estimate.

In the above-mentioned steps S3-3 signaling information step solved entrained by the leading symbol, signaling information parsing step Suddenly include：All or part of time domain waveform using leading symbol and/or all or part of time domain waveform by the leading symbol Frequency-region signal obtained by after Fourier transformation, solves the signaling information entrained by the leading symbol.

Such as, by each length N for receiving the corresponding A fragment positions of symbol in PFC parts_FFTTime domain receive data carry out phase After the FFT computings for answering length, zero carrier is removed, the subcarrier in frequency domain received is taken out according to effective sub-carrier positions, it is utilized To carry out signaling resolution.

If sending sequence to modulate by PN, the subcarrier in frequency domain of reception first can be first demodulated PN operations by receiving terminal, ZC sequence signaling resolutions are carried out again.Also signaling resolution can directly directly be carried out with the subcarrier in frequency domain for the reception for not demodulating PN.This The two to differ only in the method that known array set takes different, will hereafter illustrate.

Further, can using all of frequency domain main body sequence transmitted by transmitting terminal in parsing signaling information step Can different roots and/or different frequency domain shift value and the known signaling sequence set produced and all possible frequency domain modulation Frequency deviation value parses signaling.Here known array set, includes following meanings：

It is all possible take root in and/or all possible frequency-domain circular displacement produce CAZAC sequences, if in transmitting terminal PN is modulated, then known array set can both refer to the arrangement set after modulation PN, can also refer to the arrangement set before modulation PN.If Receiving terminal has carried out demodulation PN operations in frequency domain, then known array collection is using the arrangement set before modulation PN, if receiving terminal exists Frequency domain does not use demodulation PN, then known array collection is using the arrangement set after modulation PN.To use known array set correspondence Time domain waveform, then the arrangement set after certain PN using CAZAC sequence modulations.

Further, if after transmitting terminal generation CAZAC sequences, also having carried out the operation that interweaves, then known array set both may be used Refer to the arrangement set after frequency-domain-interleaving after CAZAC sequences/and/or modulation PN, can also refer to through the arrangement set before frequency-domain-interleaving. If receiving terminal has carried out deinterleaving operation in frequency domain, known array collection uses the arrangement set before frequency-domain-interleaving, if connect Receiving end does not use deinterleaving to operate in frequency domain, then known array collection uses the arrangement set after frequency-domain-interleaving.It is known to use The corresponding time domain waveform of arrangement set, then necessarily use CAZAC sequences and/or modulation PN and the sequence sets deinterleaved Close, i.e. the set of each last sequence composition being mapped on subcarrier.

The two kinds of transmission situations used respectively from the generation method of following transmitting terminal are come the detailed process to signaling resolution Do as described below.

<First sends situation>When in the generating process of subcarrier in frequency domain, using based on different sequence production generations And/or produced based on same sequence production when the sequence of the generation further being carried out into cyclic shift.

Frequency domain signaling sub-carriers and channel estimation value and all possible frequency domain main body sequence are subjected to certain number student movement Calculate carry out signaling resolution, wherein, specific mathematical computing comprising it is following any one：

(1) the maximum likelihood related operation of channel estimation is combined；Or

(2) by channel estimation value to frequency domain signaling sub-carriers carry out channel equalization after, then with all possible frequency domain main body Sequence carries out related operation, selects maximum related value as the decoding result of signaling resolution.

The process of signaling resolution in the case of the first transmission is detailed below.

For example, if i=0:M-1, M are signaling sub-carriers number, j=0:2^P- 1, P make bit number for frequency domain is transmitted, i.e., Correspondence signaling sub-carriers collection has 2^PThe sequence .H that individual element and each element correspondence length are M_iFor each signaling sub-carriers pair The channel estimation value answered, SC_rec_iFor the frequency domain signaling sub-carriers value received,J-th of element is concentrated for signaling sub-carriers In i-th of value.

Then

Take max (corr_j) corresponding to j, that is, obtain frequency-domain transmission signaling.

If transmitting terminal has modulated PN, SC_rec_iDemodulated without PN, thenCorrespondence is using the sequence sets after modulation PN Close；If SC_rec_iDemodulated by PN, thenCorrespondence is using the arrangement set before modulation PN.

The operation of frequency-domain-interleaving is included for transmitting terminal, can simply be pushed away, it is no longer special here to illustrate.

Alternatively, the decoding process of frequency-domain transmission signaling can also be carried out in time domain, utilize known signaling sub-carriers collection Corresponding time domain signaling waveform collection is directly carried out together with obtaining the time-domain received signal of multipath accurate location after being converted through IFFT Step is related, takes that of correlation maximum absolute value, can also solve frequency-domain transmission signaling, repeat no more here.

If the signaling sub-carriers of each symbols of PFC are made up of more than one ZC sequence modulations PN and progress frequency-domain-interleaving, Receiving terminal is obtained after the effective subcarrier of frequency domain, is carried out corresponding frequency domain and is deinterleaved operation, demodulation PN operations, then carries out ZC sequence signalings Parsing.If modulating PN before frequency-domain-interleaving, advanced line frequency domain is deinterleaved, then is demodulated PN.If modulating PN to hand in frequency domain After knitting, then PN is first demodulated, then carry out frequency domain deinterleaving, or advanced line frequency domain is deinterleaved, then it is demodulated PN.But now solve The PN sequences of tune are the PN sequences after original PN is deinterleaved.

<Second sends situation>When being used in the generating process of the subcarrier in frequency domain to pre-generatmg subcarrier with the frequency When bias carries out phase-modulation.

Utilize any one in following three kinds parsing signaling methods or at least two combined carry out signaling resolutions：

First parsing signaling method：Frequency-region signal is taken out into effective subcarrier to carry out after channel equalization, and known signaling collection Each known array carry out matching/division arithmetic, directly ask for frequency domain frequency deviation value or carry out anti-Fourier's computing；And/or

Second parsing signaling method：When it is determined that the frequency domain signaling collection only one of which known array of each time-domain symbol and front and rear When the known array of symbol is also identical, only by the related time domain cyclic shift value solved of delay between front and rear time-domain symbol come Carry out parsing signaling；And/or

3rd parsing signaling method：Before the time-domain received signal and all possible frequency modulation of each time-domain symbol Time domain known array corresponding to known frequency domain sequence carries out accordingly cross-correlation, and predetermined process is carried out to cross correlation value, then Further the cross correlation value of the front and rear symbol after predetermined process is carried out according to the predetermined symbol length relation of the time-domain symbol The delay of front and rear mark space length is related, solves time domain cyclic shift values, is parsed and transmitted based on the time domain cyclic shift values Signaling.

Specifically, in the signaling information step entrained by the leading symbol is solved using frequency-region signal, if originator frequency Domain sequence generation is carried out obtained by phase-modulation by above-mentioned frequency deviation value S to each effective subcarrier, then enforceable parsing, which is received, calculates Method has following 3 kinds：

1st parsing receiving algorithm：

Frequency-region signal is taken out to the value of effective subcarrier, carried out after channel equalization, each subcarrier and known frequency domain are believed Make the corresponding subcarrier of each frequency domain known array of collection match/division arithmetic after, IFFT computings are carried out, based on IFFT's As a result transmitted signaling (comprising frequency domain main body sequence and time domain cyclic shift values are transmitted makes) is solved.

The such as known not phase modulated preceding expression formula of subcarrier in frequency domain that sends is A_k, phase modulated rear expression formula is

After channel, the frequency domain data expression formula received is

Wherein A_kThe given value of k-th of carrier wave is concentrated for known signaling.So, carry out

Or E_k=R_k·(A_k·H_k)^*Or

Wherein σ²For estimation noise variance, then by E_kIFFT computings are carried out, the position of the maximum absolute value of operation result is used In parsing signaling, i.e. frequency domain modulation frequency deviation value S (time domain cyclic shift values).

For example, it is known that frequency domain signaling collection only has 1 known array, that is, only rely on frequency domain modulation frequency deviation value S (time domain is followed Ring shift value) transmission signaling, then the result based on an IFFT, the position that its maximum absolute value value occurs parses time domain cyclic The signaling of shift transport.

For example, it is known that frequency domain signaling collection there are 2 known arrays, produced simultaneously by different root root CAZAC sequences Modulated through PN, transmit 1 signaling, while also depending on domain frequency modulation value (time domain cyclic shift values) transmits 8 signalings, then distinguished 2 above-mentioned processing are obtained to 2 IFFT result, based on 2 IFFT result, that of selection maximum absolute value value greatly is solved Frequency domain passes 1 bit signalling, while parsing 8 bits of time-domain cyclic shift transmission according to the position of big that peak value appearance Signaling.

2nd parsing receiving algorithm：

The signaling that time domain cyclic shift values are transmitted, i.e. frequency domain modulation frequency are solved based on front and rear intersymbol delay correlation Bias.This method can be used for the corresponding known frequency domain signaling collection of each time domain main running signal there was only a known array, and front and rear The corresponding known array of time domain main running signal of time-domain symbol is identical, only relies on frequency domain modulation frequency deviation value (time domain cyclic shift values) Transmit signaling.

Specifically, such as time domain shift transport N-bit signaling, corresponds respectively to 2^NIndividual shift value, so by this 2^NIt is individual Shift value plus 2 intersymbol inherent delay numbers, obtains 2 respectively^NIndividual length of delay, receiver attempts 2^NIndividual length of delay D delay Correlation, delay associated expression is as above

Wherein, L can be chosen for the length of time domain main body A, n₀After timing just synchronous or accurate Timing Synchronization, characterize The starting point of time domain main body A.

It is obtained 2^NIndividual E (D), takes out that corresponding D of maximum, you can be back-calculated to obtain the signaling of transmission.

3rd parsing receiving algorithm：

Based on time-domain received signal, all possible frequency modulation corresponding with the time domain main running signal of each time-domain symbol Time domain known array corresponding to preceding known frequency domain sequence collection carries out cross-correlation, and specific operation is carried out based on cross correlation value, then By the front and rear 2 mark space length of the further progress of cross correlation value after treatment such as the delay of the 2nd parsing receiving algorithm Correlation solves the signaling that time domain cyclic shift values are transmitted.

Here the specific operation carried out to cross correlation value, is as a rule to extract big footpath and filter out noise.Specifically, It is exactly to retain the larger peak fractions of cross correlation value, and bottom is made an uproar and partly set to 0.It is follow-up further based on the cross correlation value after processing The delay of 2 symbols is related before and after carrying out, and its method and judgement and the 2nd parsing receiving algorithm are same, repeat no more here.

For being explained further, if the corresponding known frequency domain sequence collection institute of the time domain main running signal of each time-domain symbol is right The time domain known array more than one answered, i.e. transmitting terminal both include using frequency domain generate cazac sequences different root values and/or Generate the cyclic shift of the same root of CAZAC sequences to transmit signaling using frequency domain, also press frequency deviation value to each effective by frequency domain When subcarrier carries out the method transmission signaling of phase-modulation, then multiple time domain known arrays are carried out with time-domain received signal mutual Correlation, then each time-domain symbol select maximum that of cross correlation value and carry out subsequent treatment, utilize maximum that of cross-correlation Element in its individual corresponding known frequency domain sequence collection, you can parse by frequency domain generate the different root values of CAZAC sequences with/ Or the signaling transmitted using the cyclic shift of the frequency domain generation same root of CAZAC sequences.Further, using follow-up mutual simultaneously The delay of 2 mark space length is related before and after correlation is further carried out, to solve by frequency domain by frequency deviation value to each effective Subcarrier carries out the signaling that the method for phase-modulation is transmitted.

Further, no matter using which kind of signaling resolution mode, when PFC upper time domain main running signal decoding terminates Afterwards, it is assumed that decoding is correct, by the use of Last decoding information as information is sent, channel is carried out again in time domain/frequency domain and is estimated Meter, and certain certain operations is carried out with previous channel estimation results, new channel estimation results are obtained, for next time domain The channel estimation of the signaling resolution of main running signal.

Further, can be according to parameter after signaling resolution completes to solve frame format parameter and/or urgent broadcast content After content is obtained the position of PCC symbols or the position of data symbol with the position of PFC symbols is had determined that and carried out based on this Continuous parsing PCC symbols or data symbol.

Finally illustrate, in receiving terminal, judge whether it is expected that the leading symbol received there can be a variety of methods, Operation result such as after related in above-mentioned the 1. initial timing synchronization judges, can also be estimated by follow-up integer frequency offset Meter, accurate Timing Synchronization, the reliability of channel estimation or decoded result judges.

Wherein, the operation result after related in above-mentioned the 1. initial timing synchronization judges, can be using fixed threshold Method, i.e. operation result exceed fixed threshold, then it is assumed that there is the leading symbol part for expecting to receive, and based on the operation result Corresponding position can release the position that corresponding three-stage structure time-domain symbol occurs.

Not shown in figure, embodiments of the invention additionally provide a kind of generating means of leading symbol, the generating means Including：Subcarrier generation unit, based on frequency domain subject sequence column-generation subcarrier in frequency domain；Frequency-domain transform unit, to subcarrier in frequency domain Carry out inversefouriertransform and obtain time domain main running signal；And Time Domain Processing unit, time domain main running signal is based on by least one The time-domain symbol generation leading symbol of formation.

Wherein, subcarrier generation unit is included：For the sequence for the predetermined sequence create-rule for generating frequency domain main body sequence Generation module；And/or frequency domain main body sequence is carried out at the carrier wave of predetermined process rule of the processing for generating subcarrier in frequency domain Manage module.

Predetermined sequence create-rule includes the following combination of any one or two kinds in sequence generating module：Based on different sequences Column-generation formula is produced；And/or produced based on same sequence production, the sequence of the generation is further subjected to cyclic shift, carried Predetermined process rule is included in ripple processing module：To the pre-generatmg subcarrier obtained by being handled based on frequency domain main body sequence according to Frequency deviation value carries out phase-modulation.

Not shown in figure, embodiments of the invention additionally provide a kind of generating means of leading symbol, the generating means Including：Time domain generation unit, the time-domain symbol with following three-stage structures is generated based on time domain main running signal；And leading generation Unit, leading symbol is generated based at least one time-domain symbol.

Wherein, the first three-stage structure is included：Time domain main running signal, neat time domain main running signal end choose part generation Prefix and the suffix of part generation is chosen in prefix ranges based on time domain main running signal；Second of three-stage structure bag Contain：Time domain main running signal, neat time domain main running signal end are chosen the prefix of part generation and existed based on time domain main running signal The advanced of part generation is chosen in prefix ranges to sew.

The leading symbol generated by leading generation unit is included：Time-domain symbol with the first three-stage structure；Or tool There is the time-domain symbol of second of three-stage structure；Or several time-domain symbols with the first three-stage structure arranged in no particular order And/or the independent assortment of several time-domain symbols with second of three-stage structure.

Not shown in figure, embodiments of the invention additionally provide a kind of reception device of leading symbol, the reception device Including：Baseband processing unit, is handled the physical frame received to obtain baseband signal；Judging unit, judges that base band is believed With the presence or absence of the leading symbol for expecting to receive in number；Signaling resolution unit, it is determined that the leading symbol received is in physical frame Position simultaneously solves the signaling information entrained by the leading symbol in the presence of signaling information.

The generating means and reception device of leading symbol provided in this implementation and leading symbol in above-described embodiment Generation method, method of reseptance distinguish corresponding, then the structure and technology essential factor having in device can be by generation method phases It should change to be formed, 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 modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention Protection domain.

Claims (6)

1. a kind of method of reseptance of leading symbol, it is characterised in that comprise the following steps：

The physical frame received is handled to obtain baseband signal；

Judge in the baseband signal with the presence or absence of the leading symbol for expecting to receive；

It is determined that position of the leading symbol in physical frame that receives and solving the leading symbol in the presence of signaling information and being taken The signaling information of band,

Wherein, when in judging the baseband signal with the presence or absence of the leading symbol for expecting to receive, using following any A kind of mode or any at least two modes independent assortment carry out reliability judgement：

Initial timing synchronization mode, integer frequency offset estimation mode, accurate Timing Synchronization mode, channel estimation mode and decoding Interpretation of result mode.

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

Wherein, the leading symbol of reception originator generation step, comprising：

Based on frequency domain subject sequence column-generation subcarrier in frequency domain；

Inversefouriertransform is carried out to the subcarrier in frequency domain and obtains time domain main running signal；And

The leading symbol is generated based on the time-domain symbol that the time domain main running signal is formed by least one,

Wherein, the step of generating the subcarrier in frequency domain includes：Predetermined sequence for generating the frequency domain main body sequence is generated Rule；And/or the predetermined process rule that processing is used to generate the subcarrier in frequency domain is carried out to the frequency domain main body sequence.

3. the method for reseptance of leading symbol as claimed in claim 2, it is characterised in that

When in the generating process of the subcarrier in frequency domain, using based on different sequence production generations and/or based on same sequence When the sequence of the generation is further carried out cyclic shift by the generation of column-generation formula,

The frequency domain signaling sub-carriers and channel estimation value and all possible frequency domain main body sequence are subjected to certain number Student movement, which is calculated, carries out signaling resolution,

Wherein, the specific mathematical computing comprising it is following any one：

With reference to the maximum likelihood related operation of channel estimation；Or

By the channel estimation value to the frequency domain signaling sub-carriers carry out channel equalization after, then with all possible frequency domain Main body sequence carries out related operation, selects maximum related value as the decoding result of signaling resolution.

4. the method for reseptance of leading symbol as claimed in claim 2, it is characterised in that

Wherein, when used in the generating process of the subcarrier in frequency domain to pre-generatmg subcarrier with the frequency deviation value enter line phase adjust When processed,

Signaling resolution is carried out using in the following manner：

Frequency-region signal is taken out into effective subcarrier to carry out after channel equalization, and each known array of known signaling collection is carried out With/division arithmetic, directly ask for frequency domain frequency deviation value or carry out anti-Fourier's computing.

5. the method for reseptance of leading symbol as claimed in claim 2, it is characterised in that

Wherein, when used in the generating process of the subcarrier in frequency domain to pre-generatmg subcarrier with the frequency deviation value enter line phase adjust When processed,

Signaling resolution is carried out using in the following manner：

When it is determined that the frequency domain signaling collection only one of which known array of each time-domain symbol and known array of front and rear symbol is also identical When, parsing signaling is only carried out by the related time domain cyclic shift value solved of delay between front and rear time-domain symbol.

6. the method for reseptance of leading symbol as claimed in claim 2, it is characterised in that

Wherein, when used in the generating process of the subcarrier in frequency domain to pre-generatmg subcarrier with the frequency deviation value enter line phase adjust When processed,

Signaling resolution is carried out using in the following manner：

To corresponding to the known frequency domain sequence before the time-domain received signal and all possible frequency modulation of each time-domain symbol Time domain known array carries out accordingly cross-correlation, predetermined process is carried out to cross correlation value, further by after predetermined process Mark space length prolongs before and after the cross correlation value of front and rear symbol is carried out according to the predetermined symbol length relation of the time-domain symbol It is related late, time domain cyclic shift values are solved, based on time domain cyclic shift values parsing transmission signaling.