CN106685885A - Device for receiving leading symbols - Google Patents

Abstract

The invention provides a device for receiving leading symbols. The device comprises a processing judgment part and a positioning and analyzing part. The processing judgment part is used for judging whether the leading symbols exist in processed baseband signals or not. The positioning and analyzing part is used for determining the positions of the leading symbols in physical frames and analyzing signaling information carried by the leading symbols. The positioning and analyzing part comprises a carrier extraction unit, an operation processing unit and a selection analysis unit. The carrier extraction unit is used for extracting effective subcarriers after a time domain main signal of each time domain signal is subjected to Fourier transform. The operation processing unit is used for carrying out preset arithmetical operation and inverse Fourier transform on each effective subcarrier and a known subcarrier corresponding to each frequency domain known sequence in a known frequency domain signaling set of the time domain symbol in sequence and obtaining an inverse Fourier result corresponding to each frequency domain known sequence. The selection analysis unit is used for carrying out preset processing operation on multiple time domain symbols based on the inverse Fourier selected result selected by each time domain symbol from the inverse Fourier results according to the first preset selection rule and analyzing the signaling information based on the obtained processing result between the symbols.

Description

The reception device of leading symbol

The application is the divisional application of original bill, the application number 201510076151.X of original bill, at 2 months 12 applying date 2015 year Day, invention and created name " method of reseptance and device of leading symbol ".

Technical field

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

Background technology

At present, realize the synchronous method of transmitting terminal and 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 there is a P1 symbol in each physics frame in or multiple P1 symbols continuously occur, P1 symbol Number purposes include：

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

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

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

4) emergency alarm or broadcast system wake up.

Generally sending method of the leading symbol in transmitting terminal, for the purpose for improving system transfers efficiency, is present so Technology is considered, produces different sequences based on different sequence productions or carried out again being circulated in time domain based on same sequence production Frequency modulation obtains time-domain symbol to generate time domain main running signal and further process generation in displacement or frequency domain, will be with this knot The time-domain symbol of structure to transmit signaling, tackling in this, in receiving terminal side, preliminary interpretation positioning exist expect to receive when After the symbol of domain, parse signaling to Qian Hou symbol frequency domain direct differential, however in receiving terminal so parsing way but exist it is following Drawback：Multipath channel and low signal-to-noise ratio is lower has robustness not high；Occur in channel estimation less accurate or a variety of causes It is easier to erroneous judgement occur during interference footpath.

The content of the invention

The problem that the present invention is solved is that the method for reseptance and device of leading symbol, enters in effective subcarrier in prior art In row time domain in cyclic shift or frequency domain frequency modulation generating time-domain symbol under the premise of the transmission for transmitting signaling, tentatively sentencing Read positioning expect after the time-domain symbol for receiving using Qian Hou symbol frequency domain direct differential parsing signaling, is caused multipath channel with Low signal-to-noise ratio is lower to have robustness not high；Appearance is easier to when interference footpath occurs in channel estimation less accurate or a variety of causes The such problem of erroneous judgement.

To solve the above problems, a kind of method of reseptance of leading symbol is embodiments provided, it is adaptable to transmitting terminal When meeting predetermined transmission rule, it is characterised in that comprise the steps：Before judging whether to the baseband signal that process is obtained Lead symbol；Determine that leading symbol position and parses the signaling information that the leading symbol is carried in physical frame, wherein, enter at this In the step of row determines and parses, comprising：The time domain main running signal of each time-domain symbol is carried out being extracted after Fourier transformation Effective subcarrier；Concentrate each frequency domain known array corresponding each effective subcarrier and the known frequency domain signaling of the time-domain symbol Known subcarrier carry out inversefouriertransform after predetermined mathematical computing, corresponding to each frequency domain known array obtain one it is anti- Fourier's result；And each time-domain symbol is based on the first predetermined selected rule from institute in one or more anti-Fourier's results The anti-Fourier's selected results selected, then predetermined process operation, the intersymbol based on gained will be carried out between multiple time-domain symbols Result solves signaling information.

Alternatively, wherein, make a reservation for send rule：The corresponding frequency domain master of time domain main running signal in each time-domain symbol for sending Body sequence carries out process and obtains generating after pre-generatmg subcarrier, in a frequency domain each effective subcarrier is entered with predetermined frequency deviation value S Displacement is circulated in the time domain after line phase modulation or inversefouriertransform.

Alternatively, also include, anti-Fourier's selected results are taken absolute value or is taken absolute value square, then come with first Predetermined selected rule selects anti-Fourier's selected results.

Alternatively, wherein, the first predetermined selected rule is included to be carried out selecting and/or maximum with peak-to-average force ratio with peak value maximum Selected.

Alternatively, also make an uproar process step including filter, filter process step of making an uproar includes：Can be by anti-Fu of each time-domain symbol Leaf result carries out filter and makes an uproar process, will greatly be worth reservation, the whole zero setting of little value.

Alternatively, wherein, the signaling information for being parsed is included：Different frequency domain sequence transmission signalings and/or frequency domain modulation Frequency deviation is the transmitted order of time domain cyclic shift values.

Alternatively, it is known that frequency domain signaling collection refers to that the corresponding main body time-domain signal of each time-domain symbol is carried in frequency domain Fill before ripple phase modulation to the frequency domain sequence of subcarrier and be possible to sequence.

Alternatively, wherein, when the known frequency domain sequence collection of time-domain symbol only has 1 known array, then first predetermined select Rule is directly to take unique anti-Fourier's result of each of which time-domain symbol as anti-Fourier's selected results, then by multiple time domains Predetermined process operation is carried out between symbol, signaling information is solved based on the intersymbol result of gained.

Alternatively, wherein, predetermined mathematical computing is included：Conjugate multiplication or division arithmetic.

Alternatively, wherein, predetermined process operation will be carried out between multiple time-domain symbols, based on gained intersymbol process knot In the step of fruit solves signaling information, comprising：Latter time-domain symbol is circulated into displacement, is carried out with previous time-domain symbol Be multiplied or conjugate multiplication and add up obtain accumulated value, find out corresponding to accumulated value in all predetermined frequency deviation values or cyclic shift value most Big shift value, by the shift value signaling information is extrapolated.

The embodiment of the present invention additionally provides a kind of reception device of leading symbol, it is adaptable to which dispensing device meets predetermined transmission When regular, it is characterised in that include：Judging part is processed, for judging whether leading character to the baseband signal that process is obtained Number；And positioning analysis unit, for determining that leading symbol position and parses the signaling that the leading symbol is carried in physical frame Information, wherein, positioning analysis unit is included：Carrier extract unit, for the time domain main running signal of each time-domain symbol to be carried out into Fu In extract effective subcarrier after leaf transformation；Operation processing unit, by each effective subcarrier and the known frequency of the time-domain symbol Domain signaling concentrates the corresponding known subcarrier of each frequency domain known array to carry out inversefouriertransform after predetermined mathematical computing, correspondence Anti- Fourier's result is obtained in each frequency domain known array；And selected resolution unit, each time-domain symbol be based on The selected anti-Fourier's selected results from one or more anti-Fourier's results of first predetermined selected rule, then when will be multiple Predetermined process operation is carried out between the symbol of domain, signaling information is solved based on the intersymbol result of gained.

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

The method of reseptance and device of the leading symbol for providing according to embodiments of the present invention, due to using coherent demodulation in multipath The performance of very robust can be realized under channel and low signal-to-noise ratio, thus compared to the symbol frequency domain direct differential parsing using before and after Method, it is to avoid amplification noise, in addition further with Qian Hou symbol operating structure relative displacement, solve and estimate in channel There is disturbing erroneous judgement problem during footpath in meter less accurate or a variety of causes, improves system accuracy.

Description of the drawings

Fig. 1 is the schematic flow sheet of the method for reseptance of leading symbol in embodiments of the invention one；

Fig. 2 is the schematic flow sheet for parsing signaling in embodiments of the invention one in the method for reseptance of leading symbol；

Fig. 3 is the spatial structure schematic diagram of physical frame in embodiments of the invention；

Fig. 4 is that the Physical Frame Structure comprising form control section and content-control part in embodiments of the invention is illustrated Figure；

Fig. 5 be embodiments of the invention leading symbol in frequency domain schematic diagram corresponding to a time-domain symbol；

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

Fig. 7 is the schematic diagram of second three-stage structure in embodiments of the invention；

Fig. 8 is waveform of the anti-Fourier's result of a time domain main running signal in embodiments of the invention one under AWGN Figure；

Fig. 9 is the channel of the anti-Fourier's result in the footpaths of 0dB two of a time domain main running signal in embodiments of the invention one Under oscillogram；

Figure 10 (a) is time domain main running signal in the previous time-domain symbol for filter in embodiments of the invention one before processing of making an uproar Oscillogram of the anti-Fourier's result under the channel in the footpaths of 0dB two；

Figure 10 (b) is time domain main running signal in latter time-domain symbol for filter in embodiments of the invention one before processing of making an uproar Oscillogram of the anti-Fourier's result under the channel in the footpaths of 0dB two；

Figure 11 (a) is that time domain main running signal in the previous time-domain symbol after processing of making an uproar is filtered in embodiments of the invention one Oscillogram of the anti-Fourier's result under the channel in the footpaths of 0dB two；

Figure 11 (b) is that time domain main running signal in latter time-domain symbol after processing of making an uproar is filtered in embodiments of the invention one Oscillogram of the anti-Fourier's result under the channel in the footpaths of 0dB two；

Figure 12 is the schematic flow sheet for parsing signaling in embodiments of the invention two in the method for reseptance of leading symbol；

Figure 13 is waveform of the anti-Fourier's result of a time domain main running signal in embodiments of the invention two under AWGN Figure；And

Figure 14 is the schematic flow sheet for parsing signaling in embodiments of the invention three in the method for reseptance of leading symbol.

Specific embodiment

Inventor has found the method for reseptance and device of leading symbol in prior art, carries out being followed in time domain in effective subcarrier Ring shift or frequency domain in frequency modulation generating time-domain symbol with the premise of the transmission for transmitting signaling, expect in preliminary interpretation positioning After the time-domain symbol of reception using to Qian Hou symbol frequency domain direct differential parsing signaling, under causing multipath channel and low signal-to-noise ratio Had robustness is not high；As being easier to occur judging by accident when interference footpath occurs in channel estimation less accurate or a variety of causes Problem.

For the problems referred to above, inventor is through research, there is provided a kind of method of reseptance of leading symbol, it is adaptable to transmitting terminal When meeting predetermined transmission rule, it is characterised in that comprise the steps：Before judging whether to the baseband signal that process is obtained Lead symbol；Determine that leading symbol position and parses the signaling information that the leading symbol is carried in physical frame, wherein, enter at this In the step of row determines and parses, comprising：The time domain main running signal of each time-domain symbol is carried out being extracted after Fourier transformation Effective subcarrier；Concentrate each frequency domain known array corresponding each effective subcarrier and the known frequency domain signaling of the time-domain symbol Known subcarrier carry out inversefouriertransform after predetermined mathematical computing, corresponding to each frequency domain known array obtain one it is anti- Fourier's result；And each time-domain symbol is based on the first predetermined selected rule from institute in one or more anti-Fourier's results The anti-Fourier's selected results selected, then predetermined process operation, the intersymbol based on gained will be carried out between multiple time-domain symbols Result solves signaling information.

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

<Embodiment one>

Fig. 1 is the schematic flow sheet of the method for reseptance of leading symbol in embodiments of the invention one；Fig. 2 is the reality of the present invention Apply the schematic flow sheet for parsing signaling in example one in the method for reseptance of leading symbol.

As shown in figure 1, in the present embodiment leading symbol method of reseptance, it is adaptable to the leading symbol that transmitting terminal is used When sending method meets predetermined transmission rule, the method for reseptance of the leading symbol comprises the steps：

Step S1-1：Leading symbol is judged whether to the baseband signal that process is obtained；And

Step S1-2：Determine that leading symbol position and parses the signaling information that the leading symbol is carried in physical frame.

Wherein, as shown in Fig. 2 the determination leading symbol in step S1-2 position and parses the leading character in physical frame In number signaling information for carrying, the analyzing step of the signaling includes step in detail below：

Step S2-1-1：The time domain main running signal of each time-domain symbol is carried out to extract effectively son load after Fourier transformation Ripple；

Step S2-1-2：The known frequency domain signaling of each effective subcarrier and the time-domain symbol is concentrated known to each frequency domain The corresponding known subcarrier of sequence carries out inversefouriertransform after predetermined mathematical computing, obtains corresponding to each frequency domain known array To anti-Fourier's result；And

Step S2-1-3：Each time-domain symbol is based on the first predetermined selected rule from one or more anti-Fourier's results In selected anti-Fourier's selected results, then predetermined process operation, the symbol based on gained will be carried out between multiple time-domain symbols Result solves signaling information between number.

In the predetermined transmission rule of the targeted applicable transmitting terminal of the method for reseptance of the leading symbol of the invention described above, pass through Fig. 3 to Fig. 7 does following description explanation.

Fig. 3 is the spatial structure schematic diagram of physical frame in embodiments of the invention.

As shown in figure 3, the physical frame that this enforcement transmitting terminal is sent is respectively comprising leading symbol and data area, wherein, Leading symbol is located at before data area, and two sections of Physical Frame Structures are given in Fig. 3.

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

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

Fig. 4 is that the Physical Frame Structure comprising form control section and content-control part in embodiments of the invention is illustrated Figure.

As shown in figure 4, Physical Frame Structure includes leading symbol and data area, wherein leading symbol is included：By physical layer Form control section PFC and physical layer content-control part PCC.Certainly, leading symbol involved in the present invention is not limited to Comprising the PFC parts and PCC parts.

Form control section PFC is made up of (oblique wire frame representation is used in figure) one or more time-domain symbols, during each OFDM Domain symbol size is identical.In the present embodiment, time-domain symbol adopts OFDM symbol, as shown in Figure 4, in the present embodiment, transmitting terminal Using comprising four time-domain symbols in the PFC of form control section.

Fig. 6 is the schematic diagram of the first three-stage structure in embodiments of the invention；It is in embodiments of the invention with Fig. 7 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, due to time domain symbol in the present embodiment Number using following the first three-stage structure or second three-stage structure, 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 also can adopt With the other structures of not three-stage structure.

By Fig. 6 and Fig. 7, in the present embodiment one, time-domain symbol has following three-stage structure：Such as first in Fig. 6 Plant three-stage structure：Time domain main running signal (A sections), the prefix (C sections), the Yi Jiji that are generated based on the rear portion of the time domain main running signal The suffix (B sections) of part generation is chosen in prefix ranges in time domain main running signal；Such as second three-stage structure in Fig. 7： Time domain main running signal (A sections), the prefix (C sections) generated based on the rear portion of the time domain main running signal and based on time domain main body Signal chooses sewing in advance (B sections) for part generation in prefix ranges.

By one section of time domain main running signal (being indicated using A in figure), used as Part I, the least significant end of neat Part I is according to pre- The fixed rule that obtains takes out a part, and predetermined process simultaneously copies to the front portion of the Part I generating Part III (with C marks in figure Show) so as to as prefix, meanwhile, a part is taken out according to the predetermined rule that obtains from the rear portion of Part I, predetermined process is carried out Process and copy to the rear portion of the Part I or process and copy to the front portion of prefix generating Part II (with B in figure Sign) so as to mutually should be used as suffix respectively or sewing in advance, so as to, generate respectively B as shown in Figure 6 as suffix the first three Segment structure (CAB structures) and B are used as second three-stage structure (BCA structures) as shown in Figure 7 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 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 three-stage structure Combination.I.e. leading symbol can only include CAB or BCA, alternatively several CAB or several BCA, and alternatively quantity is not limited Any independent assortment for arranging in no particular order of several CAB and several BCA.It should be strongly noted that before the present invention Lead symbol but be not limited to the only structure comprising C-A-B or B-C-A, also can also include other spatial structures, such as tradition CP knots Structure etc..

A sections are obtained for example, by 2048 points of IFFT conversion based on certain section of frequency domain main body sequence, by the C in three-stage structure Section for a part in A sections direct copying, and B sections are the modulated signal section of a part in A sections, and the scope of data of B is less than C Scope of data, that is, select the scope to part A of modulated signal section B without departing from the model for intercepting part A as prefix C Enclose.Preferably, the length sum of the length of B and C is the length of A.

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

N2=N1+Len_B- 1 (formula 1)

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

Wherein, frequency modulation value f_SHThe corresponding subcarrier in frequency domain of time-domain OFDM symbol can be chosen for and be spaced i.e. 1/N_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_SHCan also select as 1/ (Len_BT) or The numerical value of close its value.

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

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, Part II (B) starting point will be chosen in second three-stage structure (BCA) corresponding to Part I (A) Second sampled point sequence number is set to N1_2, and the first sampled point sequence number N1_1 and the second sampled point sequence number N1_2 need to meet below equation

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

Meeting the benefit of such relation is, C sections are tied to the delay relation of the identical content of B sections with B-C-A in C-A-B structures The delay relation of B sections to A section identical contents is identical in structure, in C-A-B structures A sections to the identical content of B sections delay relation with The delay relation of B sections to C section identical contents is identical in B-C-A structures, realizes beneficial to receiver.And C-A-B structures and B-C-A knots In structure, if the modulation adopted to B sections is frequency modulation, 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, with sequence number 2 symbol of B-C-A structures is represented.It is A1 then to set P1_A (t) Time-domain expression, P2_A (t) is the time-domain expression of A2, then the time-domain expression of C-A-B three-stage structures is

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

Wherein, the first three-stage structure for arranging in no particular order and second three-stage structure, can divide according to the difference of priority Do not form different by several the first three-stage structures and/or the leading character of several second three-stage structure independent assortment 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 second leading symbol of individual B-C-A and 1 C-A-B.

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

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

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

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

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

(1) C-A-B, B-C-A, C-A-B, B-C-A；Or

(2) C-A-B, B-C-A, B-C-A, B-C-A；Or

(3) B-C-A, C-A-B, C-A-B, C-A-B；Or

(4) C-A-B, B-C-A, C-A-B, C-A-B；Or

(5) C-A-B, C-A-B, C-A-B, B-C-A；Or

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

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

The structure of such four time-domain symbols of wherein, for example (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 adopts 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, make the expression formula that P1_A (t) is time domain main body A, then can derive the time domain table of C-A-B and B-C-A It is up to formula

And

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

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

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

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

Below in conjunction with Fig. 5 from frequency domain angle, to the generating process in time domain main running signal A of three-stage structure (CAB or BCA) It is described explanation.

Fig. 5 be embodiments of the invention leading symbol in frequency domain schematic diagram corresponding to a time-domain symbol.

As shown in figure 5, the subcarrier in frequency domain for giving a time-domain symbol in the PFC of leading symbol is generated, 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 Frequency domain main body sequence is carried out to process the predetermined process rule for generating subcarrier in frequency domain.

For predetermined sequence create-rule, the generating process of frequency domain main body sequence is more flexible, the predetermined sequence life Into rule comprising the following combination of any one or two kinds：Produced based on different sequence productions；And/or given birth to based on same sequence An accepted way of doing sth is produced, and further the sequence of the generation is circulated into displacement.In the present embodiment, using permanent envelope zero auto-correlation sequence (CAZAC sequences) is realizing, that is to say, that above-mentioned different sequence production is by giving same CAZAC sequences difference root Obtain, or, above-mentioned same sequence production is obtained by giving 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 Degree N_ZC.Predetermined sequence length N_ZCFourier transformation length N that no more than time domain main running signal has_FFT。

Process filling step is carried out to frequency domain main body sequence, is 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 With the virtual subcarrier and direct current subcarrier that negative frequency subcarrier outward flange fills predetermined number；And carry out gained subcarrier Ring shift left so that first position of zero subcarrier corresponding to inversefouriertransform.

Here, enumerating the example generated based on a CAZAC sequence.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 by the complete Zadoff-Chu sequence of a certain root or cut Short generation, then may be selected the PN sequences to one same length of this ZC sequence modulation, obtain ZC_M sequences, 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 is may be selected, less than A section FFT length；Additionally, at the edge of negative frequency, fillingThe zero of number, and at the edge of positive frequency, fillThe zero of number, is virtual subcarrier；Cause This, 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；Effectively 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 difference root q, for the sequence that each root q is generated, can carry out different cyclic shifts and obtain more multisequencing again again, By this 2 kinds of modes one of arbitrarily or two transmitting signaling.

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

To bit field, the signaling transmitted can include the frame format parameter for indicating physical frame to these protocol mappings 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 carry out ZC sequences and carry out before PN sequence modulations, Can also be placed on after PN sequence modulations is carried out, in addition, being used 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 adopts 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 the PFC in follow-up time-domain symbol to transmit Signaling.

Frequency domain main body sequence (ZC sequences) used by last OFDM symbol and the frequency domain used by first OFDM symbol The phase 180 degree of main body sequence (ZC sequences), this is used to refer to last OFDM symbol of PFC；First in PFC The root sequence of the ZC sequences that OFDM symbol is adopted, generally 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；Additionally, using the corresponding root and/or use in first time domain main running signal In the initial phase transmission information of the PN sequences for carrying out PN modulation, the initial phase of PN also has certain signalling capability, for example, refers to Show version number.

Here, enumerating the example generated based on multiple CAZAC sequences.Each CAZAC sequence has respectively corresponding subsequence Length L_M, each CAZAC sequence is generated according to above-mentioned predetermined sequence create-rule there is sub-sequence length L_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 sequence is identical with above-mentioned, only increases Plus a step, after M CAZAC sequence is generated, it is N to be spliced into length_ZCSequence, may be selected Jing 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_ZCMay be selected a certain Natural number, less than A section FFT length；Additionally, at the edge of negative frequency, fillingThe zero of number, and in positive frequency The edge of rate, fillsThe 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, can also be placed on after frequency-domain-interleaving and carry out the step for modulation PN.

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

Subcarrier obtained by filling through above-mentioned process is circulated and moves to left, and after carrying out the later half frequency spectrum exchange of first half, is similar to Fftshift in Matlab, i.e., make a reservation for zero subcarrier corresponding to first position of discrete inversefouriertransform Length N_FFTFrequency-domain OFDM symbol pre-generatmg subcarrier.

Further, in this subcarrier in frequency domain implemented generating process, except preferably adopting above-mentioned predetermined sequence Create-rule, can also preferably be used in the predetermined process processed frequency domain main body sequence to generate subcarrier in frequency domain and advise 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 carried out the steps such as process filling, ring shift left and is obtained by above-mentioned to frequency domain main body sequence.In the predetermined process In rule, the subcarrier in frequency domain corresponding to same time domain main running signal A using same frequency deviation value S in the subcarrier in frequency domain each Effectively 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 that each subcarrier carries out phase-modulation by a certain frequency deviation value such as s：

Wherein, the operation that zero carrier is multiplied actually need not be carried 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 frequency deviation value S to the implementation method that each pre-generatmg subcarrier carries out phase-modulation Realize in time domain.It is equivalent to：The frequency-domain OFDM symbol Jing IFFT conversion of original unmodulated phase place is obtained into time domain ODFM symbol, Time-domain OFDM symbol can be circulated after displacement and generate time domain main running signal A, letter is transmitted by different cyclic shift values Order.In the present invention, by a certain frequency deviation value each effective subcarrier is carried out phase-modulation to be described in a frequency domain, it shows And the time domain equivalent operational approach being clear to is also within the present invention.

In sum, 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, using regular (1a) leading symbol generation method transmitting signaling.

Such as go up root q described by example and take 256 kinds, the cyclic shift value of each root q 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, with 2 as interval, such as 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,S values 0,8,16 ... 2032 etc., be equivalent to not phase modulated Frequency-domain OFDM symbol carries out the time-domain OFDM symbol after IFFT, carries out the cyclic shift of 256 kinds of different shift values, with 8 as interval, Such as 0,8,16 ... 2032 etc., transmit 8 bit signallings.Here, the present invention does not limit moving to left or moving to right for cyclic shift, works as s For positive number when, correspondence time domain cyclic move to left, such as value be 8, move to left 8 corresponding to time domain cyclic；When s is negative, when to corresponding to Domain ring shift right, such as value are -8, and corresponding to time domain cyclic 8 are moved to right.

In addition, in the above-mentioned methods, the method that frequency domain modulation frequency deviation value is that time domain shift value transmits signaling is not limited, i.e., Both comprising directly transmitting signaling with the absolute shift value of current sign, the difference also comprising the shift value with Qian Hou symbol is transmitting letter Order, the signaling resolution of both approaches can apparently release another by one of which.Letter is not limited simultaneously yet Order and the corresponding relation of shift value, originator can freely set, and receiving terminal is obtained by established rule reverse push.Using each symbol Shift value absolute value be exemplified below passing signaling：4 PFC symbols are such as had, wherein first symbol does not transmit signaling, and The signalling value to be sent of second to the 4th symbol is respectively S1, S2, S3.Hypothesis carrys out corresponding displaced with the value of 4 times of signalings Value, then the shift value of second symbol is 4S1, and the shift value of second symbol is 4S2, and the shift value of the 3rd symbol is 4S3； Signaling is passed using the shift value difference of Qian Hou symbol to be exemplified below：4 PFC symbols are such as had, wherein first symbol is not Transmission signaling, and the signalling value to be sent of second to the 4th symbol is respectively S1, S2, S3.Assume with the value of 4 times of signalings Carry out corresponding displaced value, then the shift value of second symbol is 4S1, and the shift value of second symbol is 4 (S1+S2), and the 3rd accords with Number shift value be 4 (S1+S2+S3)；

It is targeted applicable to the method for reseptance of the leading symbol of the present invention above by the description done with reference to Fig. 3 to Fig. 7 The predetermined transmission rule of transmitting terminal be illustrated.

The present invention is calculated the reception of leading symbol respectively by the present embodiment one and following embodiments two, embodiment three Method is illustrated, and all embodiments based on different sequence productions in receiving terminal it should be noted that either produced not Same sequence, is also based on same sequence production, then is circulated displacement and obtains different sequences, connects set forth in the present invention This 2 kinds of situations are not differentiated between in receiving method, is all unitedly called nothing but in using different frequency domain sequence transmission signalings, the present invention's connects Receiving method does not limit this method that frequency domain modulation frequency deviation value i.e. time domain shift value transmits signaling, both comprising absolute with current sign Shift value directly transmits signaling, and the difference also comprising the shift value with Qian Hou symbol is transmitting signaling.

On the whole, the predetermined transmission rule that need to be met is included, time domain main running signal pair in each time-domain symbol of transmission The frequency domain main body sequence answered carries out process and obtains generating after pre-generatmg subcarrier, has to each with predetermined frequency deviation value S in a frequency domain Effect subcarrier carries out being circulated displacement after phase-modulation or inversefouriertransform in the time domain.

Illustrate continuing with embodiment one, time domain main running signal A corresponding to each PFC symbol is carried out into FFT computings, obtain To frequency-region signal, frequency-region signal is taken out into the value of effective subcarrier, by each subcarrier and frequency domain signaling collection known to the symbol The corresponding subcarrier of each frequency domain known array carries out after predetermined mathematical computing, carrying out IFFT computings, sequence known to each frequency domain Row one IFFT result of correspondence, result of each symbol based on one or more IFFT selects each symbol the most reliable Individual IFFT results, and can carry out predetermined process, recycle the result between multiple symbols, further carry out it is intersymbol certain Plant computing and solve transmitted signaling information (comprising different frequency domain sequences transmission signalings and/or frequency domain modulation frequency deviation i.e. time domain cyclic Shift value is transmitted to be made).

Here known frequency domain signaling collection is included：Each corresponding main running signal A of PFC symbols modulates phase in subcarrier in frequency domain Fill to the frequency domain sequence of subcarrier before position and be possible to sequence.As transmitting terminal there are modulation PN operations, herein refer to modulate after PN All possible frequency domain sequence.

When frequency domain signaling collection only has a known array known to the symbol, that is, only rely on frequency domain modulation frequency deviation i.e. time domain cyclic Shift value is transmitted when making, and analytic method can be simplified as in the method for reseptance in embodiment one：

Time domain main running signal A corresponding to each PFC time-domain symbol is carried out into FFT computings, frequency-region signal is obtained, by frequency domain Signal takes out the value of effective subcarrier, has each effective subcarrier the only known frequency domain sequence corresponding with the symbol is corresponding Effect subcarrier carries out after certain computing (conjugate multiplication/division arithmetic), carrying out IFFT computings, based on the IFFT results, may be selected Carry out predetermined process, recycle the process IFFT results between multiple symbols, further carry out predetermined between time-domain symbol Process operation and solve transmitted signaling (frequency domain modulation frequency deviation i.e. time domain cyclic shift values are transmitted to be made).

Specifically, to certain PFC symbol, the known frequency domain pre-generatmg subcarrier that sends of its main running signal A is adjusted without phase place Expression formula before system is A_k, phase modulated rear expression formula is

Wherein, H_kFor channel frequency domain response, after channel, the frequency domain data expression formula for receiving is

The predetermined mathematical computing (conjugate multiplication/division arithmetic) employed in this enforcement is so carried out,

Or E_k=R_k·(A(i)_k)^*, (formula 16)

Wherein, A (t)_kRepresent t-th known array of the frequency domain sequence collection known to PFC symbols, t=1 ... T, if altogether There is T sequence.

If known frequency domain sequence collection only has a known array, i.e. T=1, then A (1)_k=A_k.Such as, adoptThe predetermined mathematical operation method being divided by, when known frequency domain sequence collection only has a known array, then derives

Its physical significance is the product of the channel estimation value with phase modulation value of each subcarrier；And another predetermined number The formula that student movement is calculated

Equally include the product of the channel estimation value with phase modulation value of each subcarrier.

Again by E (t)_k, k=0,1 ... .N_FFT- 1 carries out IFFT computings, then each PFC symbol will obtain t IFFT fortune The result of calculation, the operation for selectively result being taken absolute value or being taken absolute value square, then according to first predetermined selectes Rule chooses t=1 ... in the T result of T the most reliably that as the PFC symbols operation result, the t corresponding to it Value can solve the signaling transmitted by frequency domain difference sequence.Determination methods the most reliable described in first predetermined selected rule But peak value maximum or peak-to-average force ratio maximum etc..

If the known frequency domain sequence collection of each PFC symbol only has 1 known array, choose the most reliable in T result That as the symbol operation result the step for can omit, directly take unique IFFT results conduct of each of which symbol IFFT selected results.

Fig. 8 is waveform of the anti-Fourier's result of a time domain main running signal in embodiments of the invention one under AWGN Figure.Shown in figure, the serial number 1049 of the maximum appearance of discrete inverse-Fourier transform is worth for 1.024.

It is assumed that PFC mono- has Q symbol, then following waveforms C (q) of Q symbol will be obtained, q=1 ... Q.Note C (q) can be from T result choose after certain original I FFT result, or ask for absolute value or absolute value is flat Result behind side.

Affect in view of the interference footpath under the impact of noise and multipath, and a variety of causes, such as at two footpaths of 0dB, be in Reveal 2 peak values, the bad judgement of its peak-peak, Fig. 9 is provided in embodiment one in anti-Fu of a time domain main running signal Oscillogram of the leaf result under the channel in the footpaths of 0dB two.

Therefore, it is illustrated in fig. 9 shown below, further anti-Fourier's operation result of each time-domain symbol can be carried out into filter and be made an uproar place Reason, i.e., retain big value, and the whole zero setting of little value, this step is optional.The result corresponding to all PFC symbols is obtained, Here it is named as C'(q), q=1 ... Q.

C'(q-1 before and after being given below under the footpath channels of 0dB two after the before processing of 2 symbols) and signal C'(q) Figure.Figure 10 (a), Figure 10 (b) are respectively that make an uproar previous time-domain symbol, latter time-domain symbol before processing are filtered in embodiment one Oscillogram of the anti-Fourier's result of middle time domain main running signal under the channel in the footpaths of 0dB two；Figure 11 (a), Figure 11 (b) are respectively real Apply the anti-Fourier knot that time domain main running signal in make an uproar previous time-domain symbol, latter time-domain symbol after processing is filtered in example one Oscillogram of the fruit under the channel in the footpaths of 0dB two.

Again by the C'(q of latter symbol) displacement is circulated, the C'(q-1 with previous symbol) it is multiplied or is conjugated It is multiplied and adds up, find out maximum that of accumulated value in all shift values, just can be extrapolated by its corresponding shift value and be transmitted Signaling, the transmission signaling is generated after pre-generatmg subcarrier, by S values to every by the frequency domain sequence of corresponding main running signal A of PFC symbols Individual effective subcarrier carries out phase-modulation, that is, be equivalent to after IFFT the mode that displacement is circulated to time-domain OFDM symbol real It is existing.

Being described in detail below for predetermined process operation is carried out between multiple time-domain symbols, by C'(q) cyclic shift V obtains C " (q, V), may be selected to move to left or moves to right, and select to move to right in this example, V ∈ [0, N_FFT- 1], then carry out for example descending the conjugation of formula It is multiplied and accumulating operation,

Special instruction, carries out a predetermined process operation simply example between above-mentioned multiple time-domain symbols, do not limit Must be conjugate multiplication, its multiplication accumulation operations can also be N_FFTIt is individual, only do several big value points.

That Accum (V) of maximum absolute value is finally chosen, its corresponding V-value can deduce that frequency domain modulation frequency deviation is instant Domain cyclic shift value transmits signaling, and here the method to calculating is not limited.

<Embodiment two>

Figure 12 be in embodiments of the invention two in the method for reseptance of leading symbol parse signaling schematic flow sheet, the solution The flow process of analysis signaling is contained in as in the method for reseptance of same leading symbol corresponding with embodiment one in Fig. 1, in embodiment The overall outline of the method for reseptance of leading symbol is omitted in two, Figure 12 is the another embodiment of Fig. 2.

As shown in figure 12, the determination leading symbol in step S1-2 position and parses the leading symbol and takes in physical frame In the signaling information of band, the analyzing step of the signaling is comprising step in detail below：

Step S2-2-1：The time domain main running signal of each time-domain symbol is carried out to extract effectively son load after Fourier transformation Ripple；

Step S2-2-2：The known frequency domain signaling of each effective subcarrier and the time-domain symbol is concentrated known to each frequency domain The corresponding known subcarrier of sequence and channel estimation value carry out inversefouriertransform after predetermined mathematical computing, corresponding to each Frequency domain known array obtains anti-Fourier's result；And

Step S2-2-3：Each time-domain symbol is based on the first predetermined selected rule from one or more anti-Fourier's results In selected anti-Fourier's selected results, for directly solving signaling information and/or carrying out using between multiple time-domain symbols Predetermined process is operated, and based on the intersymbol result of gained signaling information is solved.

The predetermined transmission rule of the targeted applicable transmitting terminal of the method for reseptance of leading symbol, same suitable in the present embodiment two Illustrated with such as Fig. 3 to Fig. 7 descriptions, repeated no more.

In the present embodiment two, time domain main running signal A corresponding to each PFC symbol is carried out into FFT computings, obtain frequency domain letter Number, frequency-region signal is taken out into the value of effective subcarrier, each effective subcarrier is each with frequency domain signaling collection known to the symbol The corresponding effective subcarrier of frequency domain known array and channel estimation value carry out predetermined mathematical computing (conjugate multiplication/division arithmetic) Afterwards, IFFT computings are carried out, each frequency domain known array one IFFT result of correspondence, each symbol is based on one or more IFFT Result, select each symbol IFFT selected results the most reliable according to predetermined selected rule, and selectively carry out Predetermined process, can based on IFFT selected results be used for directly obtain signalling value, also can further, using multiple symbols it Between result, then carry out between time-domain symbol predetermined process operation (for example postponing related) and solve transmitted signaling (including Different frequency domain sequence transmission signalings and/or frequency domain modulation frequency deviation are that time domain cyclic shift values are transmitted to be made).

Known frequency domain signaling collection refers to that each corresponding main running signal A of PFC symbols is filled before subcarrier in frequency domain phase modulation Frequency domain sequence to subcarrier is possible to sequence, and such as transmitting terminal has modulation PN operations, herein refer to modulate after PN it is all can The frequency domain sequence of energy.

When frequency domain signaling collection only has a known array known to the symbol, that is, only rely on frequency domain modulation frequency deviation i.e. time domain cyclic Shift value is transmitted when making, and embodiment two can be simplified as：

Time domain main running signal A corresponding to each PFC time-domain symbol is carried out into FFT computings, frequency-region signal is obtained, by frequency domain Signal takes out the value of effective subcarrier, and each effective subcarrier the only known frequency domain sequence corresponding with the time-domain symbol is corresponding Subcarrier and channel estimation value carry out after predetermined mathematical computing (conjugate multiplication/division arithmetic), carrying out IFFT computings, be based on The result of IFFT, and predetermined process is selectively carried out, can be used to directly obtain signalling value, also recycling multiple symbols Between result, further carry out intersymbol delay correlation and solve transmitted signaling (frequency domain modulation frequency deviation i.e. time domain is followed Ring shift value is transmitted to be made).

Specifically to certain PFC time-domain symbol, its main body time-domain signal A is known send frequency domain pre-generatmg subcarrier without Expression formula before phase-modulation is A_k, phase modulated rear expression formula is

Wherein, H_kFor channel frequency domain response, after channel, the frequency domain data expression formula for receiving is

So, predetermined mathematical computing (division arithmetic/conjugate multiplication) is carried out

Or E_k=R_k·(A(t)_k·H_est,k)^*, (formula 22)

Wherein A (t)_kRepresent t-th known array of known frequency domain sequence collection.T=1 ... T, one has T sequence.If Known frequency domain sequence collection only has a known array, i.e. T=1, then A (1)_k=A_k, wherein H_estFor channel estimation value.

Such as, predetermined mathematical computing is adoptedMethod, when known frequency domain sequence collection only has one During known array, and work as H_estDuring=H,

Then

Its physical significance is the phase modulation value of each subcarrier.And predetermined mathematical computing is using another kind of operational formula

Equally include the phase modulation value of each subcarrier.

Again by E (t)_k, k=0,1 ... .N_FFT- 1 carries out IFFT computings, then each PFC symbol will obtain t IFFT fortune The result of calculation, the operation for selectively result being taken absolute value or being taken absolute value square, then according to predetermined selected rule Choose t=1 ... in the T result of T the most reliably that used as the operation result of the PFC symbols, the t values corresponding to it are The signaling transmitted by frequency domain difference sequence can be solved.In predetermined selected rule determination methods the most reliable can be peak value most Big or peak-to-average force ratio maximum etc..

If the known frequency domain sequence collection of each PFC symbol only has 1 known array, peak-to-average force ratio is chosen in T result most That big as the symbol operation result the step for can omit, directly take unique IFFT results of each of which symbol i.e. Can.

Figure 13 is waveform of the anti-Fourier's result of a time domain main running signal in embodiments of the invention two under AWGN Figure.Shown in figure, the serial number 633 of the maximum appearance of discrete inverse-Fourier transform is worth for 0.9996.

It is assumed that PFC mono- has Q time-domain symbol, then following waveforms C (q) of Q time-domain symbol, q=will be obtained 1,...Q.Note C (q) can be from T result choose after certain original I FFT result, or ask for absolute value or Result after person's squared absolute value.

At this moment, because the operation on frequency domain is comprising the impact for removing channel, thus can directly using absolute value in C (q) most Releasing time domain cyclic shift values, it is time domain cyclic shift values institute thus to release frequency domain modulation frequency deviation for the position that big peak value is located Transmission signaling, such as position corresponding to peak-peak is 633 in upper figure.(projectional technique is not limited here.)

But affect in view of the interference footpath under the impact of noise and multipath, and a variety of causes, can also further, can The operation result of each symbol is carried out into filter to make an uproar process, i.e., big value is retained, and the whole zero setting of little value, this step is optional. To the result corresponding to all PFC symbols, C'(q is named as here), q=1 ... Q.

Again by the C'(q of latter symbol) displacement is circulated, the C'(q-1 with previous symbol) it is multiplied or is conjugated It is multiplied and adds up, in finding out all shift values, maximum that of accumulated value just can be extrapolated by its corresponding shift value and transmitted Signaling.The transmission signaling meet above-mentioned transmitting terminal predetermined transmission rule in by corresponding time domain main running signal A of PFC symbols frequency Domain sequence is generated after pre-generatmg subcarrier, and phase-modulation is carried out to each effective subcarrier by S values, that is, when being equivalent to after IFFT pair Domain OFDM symbol is circulated the mode of displacement to realize.

It is described in detail below, by C'(q) cyclic shift V obtains C " (q, V), may be selected to move to left or move to right, select in this example Select and move to right, V ∈ [0, N_FFT- 1],

Then such as following formula conjugate multiplication accumulating operation is carried out,

Special instruction, an above-mentioned simply example, it must be conjugate multiplication not limit, and its multiplication accumulation operations also may be used N need not be_FFTIt is individual, only do several big value points.

That Accum (V) of maximum absolute value is finally chosen, its corresponding V-value is corresponded to and transmits signaling.

Note, the channel estimation value H used in being described above_est,, first PFC symbol is it is generally known that by known array Carrying out time domain/frequency domain estimation method can obtain, such as receive on frequency domain and both obtained with known frequency domain sequence at frequency-region signal.And it is follow-up The channel estimation of symbol, after a upper symbol substitution of PFC terminates, it is assumed that decoding is correct, using Last decoding information As the information of transmission, channel estimation is carried out again in time domain/frequency domain, and it is specific to carry out certain with previous channel estimation results Computing, obtains new channel estimation results, for the channel estimation of the signaling resolution of next symbol.

Special instruction, the IFFT computings that embodiment one and embodiment two are mentioned are had based on IFFT computings and FFT computings Specific mathematical relationship, if not departing from present disclosure come equivalent realization with FFT.

The present embodiment one and embodiment two all employ coherent demodulation, and time domain eliminates noise, in multipath channel and low letter Make an uproar and all there is the performance of very robust than under.Compared to the method for symbol frequency domain direct differential before and after utilizing in background technology, this Invention avoids amplification noise.And the relative displacement of the operating structure further with Qian Hou symbol, solve in channel estimation Erroneous judgement problem less accurately or when a variety of causes occurs disturbing footpath.

Figure 14 is the schematic flow sheet for parsing signaling in embodiments of the invention three in the method for reseptance of leading symbol.

Figure 14 be in embodiments of the invention three in the method for reseptance of leading symbol parse signaling schematic flow sheet, the solution The flow process of analysis signaling is contained in as in the method for reseptance of same leading symbol corresponding with embodiment one in Fig. 1, in embodiment The overall outline of the method for reseptance of leading symbol is omitted in three, Figure 14 is the another embodiment of Fig. 2, Figure 12.

As shown in figure 14, the determination leading symbol in step S1-2 position and parses the leading symbol and takes in physical frame In the signaling information of band, the analyzing step of the signaling is comprising step in detail below：

Step S2-3-1：The known frequency domain signaling collection of each time-domain symbol is expanded to into known frequency domain signaling extensions collection；

Step S2-3-2：The time domain main running signal of each time-domain symbol is carried out to extract effectively son load after Fourier transformation Ripple；

Step S2-3-3：Concentrate each frequency domain known array corresponding each effective subcarrier and known frequency domain signaling extensions Known subcarrier and channel estimation value carry out predetermined mathematical computing and obtain operation values, then carry out being transported on all effective subcarriers Calculation value it is cumulative；And

Step S2-3-4：One accumulated value is selected from multigroup accumulated value with the second predetermined selected rule, using its correspondence Known frequency domain signaling extensions collection frequency domain known array, push away frequency domain modulation frequency deviation value i.e. time-domain cyclic shift transmits letter Order, and push away corresponding it is original do not extend before known frequency domain signaling collection in known frequency domain sequence, solve different by frequency domain The signaling information that sequence is transmitted.

Specifically, first the known frequency domain signaling collection of each time-domain symbol is expanded to into known frequency domain signaling extensions collection.So Afterwards time domain main running signal A corresponding to each PFC symbol is carried out into FFT computings, obtain frequency-region signal, frequency-region signal is taken out to be had The value of effect subcarrier, by each effective subcarrier load corresponding with each frequency domain known array of known frequency domain signaling extensions collection Ripple and channel estimation value are carried out after predetermined mathematical computing (conjugate multiplication/division arithmetic), then carry out the fortune on all subcarriers The cumulative of calculation value obtains accumulated value.Multigroup accumulated value is finally based on, is selected according to the second predetermined selection rule the most reliable That, using the frequency domain known array of its corresponding known frequency domain signaling extensions collection, you can push away to obtain frequency modulation value, so as to Be that time-domain cyclic shift transmits signaling to frequency domain modulation frequency deviation, at the same push away corresponding it is original do not extend before known frequency domain Known frequency domain sequence in signaling collection, solves the signaling transmitted by frequency domain difference sequence.

When the known frequency domain signaling collection that the symbol does not extend only has a known array, that is, only rely on frequency domain modulation frequency deviation i.e. Time domain cyclic shift values are transmitted when making, and embodiment three is simplified as：

First the only known frequency domain sequence of each symbol is expanded to into known frequency domain signaling extensions collection.Then by each Time domain main running signal A corresponding to PFC symbols carries out FFT computings, obtains frequency-region signal, and frequency-region signal is taken out into effective subcarrier Value, by each effective subcarrier subcarrier corresponding with each frequency domain known array of known frequency domain signaling extensions collection and letter Road estimated value is carried out after predetermined number computing (conjugate multiplication/division arithmetic), then carries out the tired of the operation values on all subcarriers Plus obtain accumulated value.Be finally based on multigroup accumulated value, select it is the most reliable that, using its corresponding known frequency domain letter The frequency domain known array of superset is made, you can push away to obtain frequency modulation value, so as to obtain frequency domain modulation frequency deviation i.e. time-domain cyclic shift Transmitted signaling.

Here known frequency domain signaling collection refers to corresponding time domain main running signal A of each PFC time-domain symbol in subcarrier in frequency domain Fill before phase modulation to the sequence that is possible to of the frequency domain sequence of subcarrier, such as transmitting terminal there are modulation PN operations, herein refers to adjust All possible frequency domain sequence after PN processed.

Known frequency domain signaling extensions collection is obtained in the following way：By each the known frequency domain in known frequency domain signaling collection Sequence carries out corresponding by be possible to frequency deviation value modulated sub-carriers phase place, its all possible S frequency modulation value, then will be raw Known array into after S frequency modulation.For example, if there is T known frequency domain sequence L in original known frequency domain signaling collection₁, L₂..., L_T, then each known frequency domain sequence L_tL will be respectively obtained by S kind frequency modulation values_{T, 1},L_{T, 2},…,L_t,SDeng.Citing comes Say：

Wherein, k corresponds to subcarrier sequence number.Wherein zero carrier is placed on Sequence number 0.By being multiplied for frequency modulation value number S and known frequency domain sequence number T, such T known frequency domain sequence will extend For TS known frequency domain sequence, known frequency domain signaling extensions collection is constituted.

When the known frequency domain signaling collection that the symbol does not extend only has a known array, that is, only rely on frequency domain modulation frequency deviation i.e. Time domain cyclic shift values are transmitted when making, i.e. T=1, then superset includes frequency domain sequence known to common S.

Specifically, for example, if K=0:N_zc-1,N_zcFor effective subcarrier number, H_est,kFor k-th effective subcarrier pair The channel estimation value answered, R_kThe value of k-th effective subcarrier to receive, L_k,t,sFor t in known frequency domain sequence superset, K-th value of s sequence.

Then

Or

Wherein, | | represent the operation that takes absolute value.

Take max (corr_t,s) or corresponding t and s, using s known to the frequency domain of its corresponding known frequency domain signaling extensions collection Sequence, you can push away to obtain frequency modulation value, so as to obtain the signaling that frequency domain modulation frequency deviation i.e. time-domain cyclic shift is transmitted；It is simultaneously sharp With t push away corresponding it is original do not extend before known frequency domain signaling collection in known frequency domain sequence, solve by frequency domain difference sequence The transmitted signaling of row.

When the known frequency domain signaling collection that the symbol does not extend only has a known array, that is, only rely on frequency domain modulation frequency deviation i.e. Time domain cyclic shift values are transmitted when making, i.e. T=1, then superset includes frequency domain sequence known to common S.Using s, its is corresponding The frequency domain known array of frequency domain signaling extensions collection is known, you can push away to obtain frequency modulation value, so as to obtain frequency domain modulation frequency deviation i.e. time domain The signaling that cyclic shift is transmitted.

Note, the H used in being described above_est, first PFC symbol by known array it is generally known that carry out time domain/frequency Domain method of estimation can be obtained, such as receive on frequency domain and both obtained with known frequency domain sequence at frequency-region signal, and the channel of successive character Estimate, after a upper symbol substitution of PFC terminates, it is assumed that decoding is correct, by the use of Last decoding information as transmission letter Breath, in time domain/frequency domain channel estimation is carried out again, and carries out certain certain operations with previous channel estimation results, is obtained New channel estimation results, for the channel estimation of the signaling resolution of next symbol.

Not shown in figure, embodiments of the invention additionally provide a kind of reception device of leading symbol, for sending dress When putting that satisfaction is predetermined to send rule, the reception device includes：Judging part is processed, the baseband signal judgement for obtaining to process is It is no to there is leading symbol；And positioning analysis unit, for determining that leading symbol position and parses the leading character in physical frame Number carry signaling information.

Wherein, position analysis unit to include：Carrier extract unit, for the time domain main running signal of each time-domain symbol to be carried out Effective subcarrier is extracted after Fourier transformation；Operation processing unit, by known to each effective subcarrier and the time-domain symbol Frequency domain signaling concentrates the corresponding known subcarrier of each frequency domain known array to carry out inversefouriertransform after predetermined mathematical computing, right Anti- Fourier's result should be obtained in each frequency domain known array；And selected resolution unit, each time-domain symbol is based on With the selected anti-Fourier's selected results from one or more anti-Fourier's results of the first predetermined selected rule, then will be multiple Predetermined process operation is carried out between time-domain symbol, signaling information is solved based on the intersymbol result of gained.

Not shown in figure, embodiments of the invention additionally provide a kind of reception device of leading symbol, for sending dress When putting that satisfaction is predetermined to send rule, the reception device includes：Judging part is processed, the baseband signal judgement for obtaining to process is It is no to there is leading symbol；Positioning analysis unit, determines that leading symbol position and parses the leading symbol in physical frame for The signaling information of carrying.

Wherein, position analysis unit to include：Carrier extract unit, the time domain main running signal of each time-domain symbol is carried out in Fu Effective subcarrier is extracted after leaf transformation；Operation processing unit, by each effective subcarrier and the known frequency domain of the time-domain symbol Signaling concentrates the corresponding known subcarrier of each frequency domain known array and channel estimation value to carry out anti-Fu after predetermined mathematical computing In leaf transformation, obtain anti-Fourier's result corresponding to each frequency domain known array；And selected resolution unit, each when Domain symbol is based on selectes knot with the selected anti-Fourier from one or more anti-Fourier's results of the first predetermined selected rule Really, for directly solving signaling information and/or using carrying out predetermined process operation, the symbol based on gained between multiple time-domain symbols Result solves signaling information between number.

Not shown in figure, embodiments of the invention additionally provide a kind of reception device of leading symbol, for sending dress When putting that satisfaction is predetermined to send rule, the reception device includes：A kind of reception device of leading symbol, it is adaptable to which dispensing device meets During predetermined transmission rule, it is characterised in that include：Judging part is processed, for judging whether to deposit to the baseband signal that process is obtained In leading symbol；Positioning analysis unit, for determining that leading symbol position and parses what the leading symbol was carried in physical frame Signaling information.

Wherein, position analysis unit to include：Extension unit, for the known frequency domain signaling collection of each time-domain symbol to be expanded to Known frequency domain signaling extensions collection；Carrier extract unit, the time domain main running signal of each time-domain symbol is carried out after Fourier transformation Extract effective subcarrier；Operation processing unit, each frequency domain is concentrated by each effective subcarrier with known frequency domain signaling extensions The corresponding known subcarrier of known array and channel estimation value carry out predetermined mathematical computing and obtain operation values, then carry out all having Operation values is cumulative on effect subcarrier；And selected resolution unit, selected from multigroup accumulated value with the second predetermined selected rule One accumulated value, using the frequency domain known array of its corresponding known frequency domain signaling extensions collection, push away frequency domain modulation frequency deviation value i.e. Time-domain cyclic shift transmits signaling, and push away corresponding it is original do not extend before known frequency domain signaling collection in known frequency domain Sequence, solves the signaling information transmitted by frequency domain difference sequence.

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

Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this 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 Technical spirit any simple modification, equivalent variations and modification that above example is made, belong to technical solution of the present invention Protection domain.

Claims (6)

1. a kind of reception device of leading symbol, it is adaptable to which dispensing device meets predetermined when sending rule, it is characterised in that bag Include：

Judging part is processed, for judging whether leading symbol to the baseband signal that process is obtained；And

Positioning analysis unit, for determining that leading symbol position and parses the signaling letter that the leading symbol is carried in physical frame Breath,

Wherein, the positioning analysis unit is included：

Carrier extract unit, for carrying out extracting effective son after Fourier transformation the time domain main running signal of each time-domain symbol Carrier wave；

Operation processing unit, each frequency domain is concentrated by each described effective subcarrier with the known frequency domain signaling of the time-domain symbol The corresponding known subcarrier of known array carries out inversefouriertransform after predetermined mathematical computing, corresponding to frequency domain each described Know that sequence obtains anti-Fourier's result；And

Selected resolution unit, each described time-domain symbol is based on the first predetermined selected rule from anti-Fu one or more described Selected anti-Fourier's selected results in leaf result, will carry out predetermined process operation between multiple time-domain symbols, be based on The intersymbol result of gained solves the signaling information.

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

Wherein, the predetermined transmission rule：The dispensing device is to time domain main running signal correspondence in each time-domain symbol of transmission Frequency domain main body sequence carry out process generate pre-generatmg subcarrier after, in a frequency domain with predetermined frequency deviation value S to each effective sub- load Ripple carries out being circulated displacement after phase-modulation or inversefouriertransform in the time domain.

3. the reception device of leading symbol as claimed in claim 1, it is characterised in that also include,

The selected resolution unit is taken absolute value to anti-Fourier's result or is taken absolute value square, then is come with described One predetermined selected rule selects anti-Fourier's selected results.

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

Filter is made an uproar processing unit, anti-Fourier's result of each time-domain symbol is carried out into filter and is made an uproar processs, will greatly be worth reservations, little to be worth whole Zero setting.

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

Wherein, the signaling information that the selected resolution unit is parsed is included：Different frequency domain sequence transmission signalings and/or frequency Domain frequency modulation is the transmitted order of time domain cyclic shift values.

6. the reception device of leading symbol as claimed in claim 1, it is characterised in that also include,

Latter time-domain symbol is circulated displacement by the selected resolution unit, is multiplied or is total to previous time-domain symbol Yoke is multiplied and adds up and obtains accumulated value, finds out corresponding to the maximum displacement of accumulated value in all predetermined frequency deviation values or cyclic shift value Value, by the shift value signaling information is extrapolated.