CN109617846A - Transmitter, receiver, the generation method of leading symbol and method of reseptance - Google Patents

Transmitter, receiver, the generation method of leading symbol and method of reseptance Download PDF

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Publication number
CN109617846A
CN109617846A CN201811344671.4A CN201811344671A CN109617846A CN 109617846 A CN109617846 A CN 109617846A CN 201811344671 A CN201811344671 A CN 201811344671A CN 109617846 A CN109617846 A CN 109617846A
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symbol
domain
signal
leading symbol
time
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CN109617846B (en
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张文军
邢观斌
黄戈
徐洪亮
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The present invention provides a kind of transmitter, receiver, leading symbol generation method with method of reseptance, it is characterised in that: based on acquired time domain main running signal generate have any one following three-stage structure time-domain symbol；And leading symbol is generated based on time-domain symbol, wherein, the suffix that the prefix generated in whole or in part based on the first, based on the main body and all or part of modulation based on the prefix generate, what all or part of prefix generated based on second, based on the main body and modulating in whole or in part based on the prefix generated sews in advance, common leading symbol is generated when being based on one, splicing, which generates, when based on multiple reinforces leading symbol, the method for reseptance of receiving end: handles physical frame to obtain baseband signal；Judge in baseband signal with the presence or absence of desired common or reinforcement leading symbol；When being judged as YES, determines position of the leading symbol in physical frame and solve entrained signaling information.

Description

Transmitter, receiver, the generation method of leading symbol and method of reseptance
This case is application number 201410753506.X, invention and created name " generation method of leading symbol and recipient Method ", the divisional application on 10 days December 2014 applying date.
Technical field
The present invention relates to wireless broadcast communication technical field, in particular to the generation method of a kind of leading symbol and recipient Method.
Background technique
Generally for enabling the receiving end of ofdm system correctly to demodulate data transmitted by transmitting terminal, ofdm system is necessary Realize between transmitting terminal and receiving end accurately and reliably time synchronization.Simultaneously as ofdm system is very quick to the frequency deviation of carrier wave Sense, the receiving end of ofdm system it is also required to provide the carrier spectrum estimation method of precise and high efficiency, accurate to carry out to carrier wave frequency deviation Estimation and correction.
Currently, it is real to realize that the transmitting terminal method synchronous with destination time is based on leading symbol in ofdm system Existing.Leading symbol is all known symbol sebolic addressing of transmitting terminal and receiving end of ofdm system, leading symbol mark physical frame Beginning (being named as P1 symbol), only occur a P1 symbol in each physical frame or multiple P1 symbols continuously occur, P1 symbol Number purposes include:
1) detect receiving end rapidly with determine transmitted in channel whether be expectation received signal；
2) basic configured transmission (such as FFT points, frame type information etc.) is provided, carry out receiving end can 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.
The P1 Design of Symbols based on CAB spatial structure is proposed in DVB_T2 standard, preferably realizes above-mentioned function.But It is still to have some limitations on low complex degree receiving algorithm.For example, in the long multipath letter of 1024,542 or 482 symbols When road, relatively large deviation can be occurred by being timed thick synchronization using the such three-stage structure of CAB, cause to estimate carrier wave integral multiple on frequency domain There is mistake in frequency deviation.In addition, in complex frequency Selective Fading Channel, such as when long multipath, DBPSK differential decoding may also It can fail.Moreover, because there is no cyclic prefix in DVB_T2 spatial structure, and if needing to carry out the frequency-domain structure group of channel estimation The problem of closing, its channel estimation in frequency domain performance degradation will be caused.
Summary of the invention
Problems solved by the invention is not recycled in DVB_T2 spatial structure in current DVB_T2 standard and other standards Prefix is not applied for relevant detection, and leading symbol low complex degree under complex frequency Selective Fading Channel is received and calculated There is the problem of probability of failure in method detection.
To solve the above problems, the embodiment of the invention provides a kind of generation methods of leading symbol, which is characterized in that packet It includes following steps: generating the time domain with any one three-stage structure in following two kinds based on acquired time domain main running signal Symbol；And leading symbol is generated based on one or two time-domain symbols, wherein the first three-stage structure are as follows: time domain main body Signal, the prefix generated of the rear portion based on the time domain main running signal and the rear portion based on the time domain main running signal are modulated The suffix of generation, second of three-stage structure are as follows: before time domain main running signal, the rear portion based on the time domain main running signal are generated Sew and the advanced of the modulated generation in rear portion based on the time domain main running signal is sewed, is generated when being based on a time-domain symbol general Logical leading symbol, when having the time-domain symbol of different three-stage structures based on two, splicing, which is generated, reinforces leading symbol.
Optionally, time domain main running signal is to carry out inverse discrete fourier transform to the frequency-domain OFDM symbol of predetermined length and obtain The time-domain OFDM symbol arrived.
Optionally, frequency-domain OFDM symbol includes virtual subcarrier, signaling sequence subcarrier and fixed sequence program subcarrier, right After signaling sequence subcarrier and fixed sequence program subcarrier are arranged according to the predetermined rule that is staggered, by virtual subnet distribution of carriers In its two sides, the predetermined rule that is staggered includes any one in following two rule: the first predetermined rule that is staggered: being in Oem character set or even surprise are staggeredly arranged；And the second predetermined rule that is staggered: a part of signaling sequence is placed on surprise Number subcarrier, another part signaling sequence is placed on even subcarriers, and a part of fixed sequence program is placed on odd subcarriers, another Part fixed sequence program is placed on even subcarriers.
Optionally, in prefix, suffix or in advance in the generation step sewed comprising the steps of: by time domain main running signal As first part, the least significant end of neat first part takes out a part according to predetermined acquisition rule, advises according to the first predetermined process It is then handled and copies to the front of the first part to generate Part III to be used as prefix, meanwhile, from first part Rear portion take out a part according to predetermined acquisition rule, handled according to the second predetermined process rule and copy to this first Point rear portion or processing and copy to the front of prefix to generate second part to mutually should be used as suffix respectively or sew in advance.
Optionally, wherein the predetermined rule that obtains includes: to set LenBFor the length of second part, LenCFor the length of Part III Degree, LenB≤LenC, the sampled point serial number that N1 is copied to the corresponding first part of starting point of second part as selection is separately set, N2 is Selection is copied to the sampled point serial number of the corresponding first part of terminal of second part, then meets following formula: N2=N1+ LenB-1。
Optionally, wherein the first predetermined process rule includes: direct copying；Or each of taken out part is adopted Sample signal is multiplied by an identical fixed coefficient or makes a reservation for different coefficients, and the second predetermined process rule includes: when the first predetermined process Rule is modulated processing when being direct copying；Or when the first predetermined process rule be each sampling in taking-up part believe Also multiplied by carrying out modulation treatment after corresponding coefficient number multiplied by an identical fixed coefficient or when making a reservation for different coefficients.
Optionally, wherein common leading symbol is based on the same time domain main running signal, passes through the first three-stage structure and the Any one in two kinds of three-stage structures is broadcasted for identifying emergent.
Optionally, wherein to reinforce in two different time domain symbols of leading symbol, two time domain main running signal is different, And the three-stage structure used is also different, by the difference of two time-domain symbols, successively sequence is leading to be respectively formed the first reinforcement Symbol and second of reinforcement leading symbol are broadcasted for identifying emergent.
The embodiment of the invention also provides a kind of method of reseptances of leading symbol, which comprises the steps of: step Rapid S2-1: the physical frame received is handled to obtain baseband signal；Step S2-2: judge to whether there is in baseband signal It is expected that received common leading symbol or reinforcement leading symbol；Step S2-3: when being judged as YES, determine the leading symbol in physics Position in frame simultaneously solves signaling information entrained by the leading symbol.
Optionally, physical frame is handled to obtain baseband signal and include the following steps: that when the signal received be zero When intermediate-freuqncy signal, after analog-to-digital conversion, then filter, down-sampling handles to obtain baseband signal, when the signal received be intermediate-freuqncy signal When, frequency spectrum shift after analog-to-digital conversion, then filter, down-sampling handles to obtain baseband signal.
Optionally, in the known transmitting terminal common leading symbol of only possible transmission, judge whether deposit in baseband signal Include the following steps: step S2-21A in the received common leading symbol of expectation: according in the received common leading symbol of expectation Part III, first part and second part between any two predetermined acquisition rule and/or predetermined process rule, to base band Signal carries out delay sliding auto-correlation after carrying out correspondingly inverse processing and signal demodulation, related cumulative to obtain three delays Value；Step S2-21B: postpone at least one of related accumulated value based on these three and perform mathematical calculations, and to the mathematical operation As a result peak detection is carried out；And step S2-21C: if the result of peak detection meets preset condition, it is determined that in baseband signal In the presence of the received common targeting signal of expectation.
Optionally, in the case where leading symbol is reinforced in the only possible transmission of known transmitting terminal, judge in baseband signal whether Include the following steps: step S2-22A in the presence of the received reinforcement leading symbol of expectation: according to the received reinforcement leading symbol of expectation In the Part III of the first three-stage structure and second of three-stage structure, first part and second part between any two predetermined Rule and/or predetermined process rule are obtained, carries out delay cunning after carrying out correspondingly inverse processing and signal demodulation to baseband signal Dynamic auto-correlation, to obtain the related accumulated value of six delays, this six values are practical to be obtained by 3 delay correlators, wherein works as reinforcement When the fixed sequence program of two symbols of leading symbol uses identical, the Part III and first of former and later two symbols also can be obtained The delay correlation accumulated value of partial combined and spliced part；Step S2-22B: six delays of step S2-22A are related cumulative Value have same delay relationship carry out be added or phase adjustment after be added, obtain the related accumulated value of three different delays, base In prolonging for the combined and spliced part of these three related accumulated values of delay and the Part III and first part of former and later two symbols At least one of correlation accumulated value performs mathematical calculations late, and carries out peak detection to the mathematical operation result；Step S2- 22C: if the result of peak detection meets preset condition, it is determined that exist in baseband signal and it is expected received reinforcement targeting signal.
Optionally it is determined that position of the leading symbol in physical frame includes: based on the peak detection for meeting preset condition Result determine position of the leading symbol in physical frame, it is expected received leading symbol if it exists, it is big according to peak value Locating partial value or maximum value determine the position that leading symbol occurs in physical frame or carry out fractional part of frequency offset estimation.
When optionally, using all or part of time domain waveform of leading symbol and/or all or part of the leading symbol The frequency-region signal that domain waveform obtains after Fourier transformation includes as follows to solve signaling information entrained by the leading symbol Step: by the inclusion of the signal and signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers pair of signaling sequence subcarrier The time-domain signal answered carries out operation, to solve the signaling information as entrained by signaling sequence subcarrier in the leading symbol, wherein Signaling sequence t easet ofasubcarriers are generated based on known signaling sequence set.
Optionally, the method for reseptance of the leading symbol in the embodiment of the present invention, it is characterised in that further include following steps: 1) According to position of the leading symbol in physical frame is determined, interception includes the signal of fixed subcarrier；It 2) include to fix by this The signal of subcarrier time-domain signal corresponding with frequency domain stator carrier wave sequence or the frequency domain stator carrier wave sequence carries out operation, To obtain integer frequency offset estimation or channel estimation.
Compared with prior art, technical solution of the present invention has the advantages that
The generation method of the leading symbol provided according to embodiments of the present invention is with method of reseptance, after time domain main running signal The signal of portion's interception certain length is as cyclic prefix or when sewing in advance, it can be achieved that relevant detection, solves noncoherent detection The problem of performance declines, and the signal of the circulating prefix-length based on above-mentioned interception generates modulated signal, so that generated Leading symbol has good fractional part of frequency offset estimation performance and Timing Synchronization performance, further, can according to efficiency of transmission and The requirement selection transmission one of robustness or two symbols respectively as common leading symbol or reinforce leading symbol, work as biography When sending the symbol of a three-stage structure as leading symbol, it is based on the same OFDM symbol main body, it is two different by designing Three-stage structure carrys out identifying emergent broadcast；When transmitting the symbol of two three-stage structures as leading symbol, two OFDM symbol Main body is different, and the three-stage structure used is also just different, on this basis, is arranged by the sequencing of two three-stage structures Carry out identifying emergent broadcast, by the different three-stage structure of two symbols, can avoid occurring under certain particular length multipath channels Small inclined estimation failure the problem of, further, leading symbol of the invention utilizes three sections of knots with the identical content in part Structure ensure that the peak value that may be significantly in receiving end using delay correlation, also, during generating the leading symbol, Design time domain main body number modulated signal can to avoid receiving end by continuous wave CO_2 laser perhaps mono-tone interference or occur and adjust The isometric multipath channel of signal length processed, or receive and missed when protection interval length is identical with modulated signal length in signal Detect situation as peak value.
Detailed description of the invention
Fig. 1 is the flow diagram of the embodiment of the generation method of leading symbol of the invention；
Fig. 2 is the schematic diagram of three-stage structure in the common leading symbol of the first in the embodiment of the present invention；
Fig. 3 is the schematic diagram of three-stage structure in second of common leading symbol in the embodiment of the present invention；
Fig. 4 is the schematic diagram for obtaining processing in the embodiment of the present invention based on the first common leading symbol；
Fig. 5 is the schematic diagram for obtaining processing in the embodiment of the present invention based on second of common leading symbol；
Fig. 6 is the schematic diagram that the first in the embodiment of the present invention reinforces two three-stage structures in leading symbol；
Fig. 7 is the schematic diagram of two three-stage structures in second of reinforcement leading symbol in the embodiment of the present invention；
Fig. 8 is to reinforce the schematic diagram that leading symbol obtains processing based on the first in the embodiment of the present invention；
Fig. 9 is to reinforce the schematic diagram that leading symbol obtains processing based on second in the embodiment of the present invention；
Figure 10 is signaling sequence subcarrier in the embodiment of the present invention, fixed sequence program subcarrier and virtual subcarrier according to The arrangement schematic diagram of the one predetermined rule that is staggered；
Figure 11 is signaling sequence subcarrier in the embodiment of the present invention, fixed sequence program subcarrier and virtual subcarrier according to The arrangement schematic diagram of the two predetermined rules that are staggered；
Figure 12 is to reinforce two time domain main running signals in leading symbol in the embodiment of the present invention with predetermined association rule In shift value 1 carry out the arrangement schematic diagram of opposite integral shift；
Figure 13 is to reinforce two time domain main running signals in leading symbol in the embodiment of the present invention with predetermined association rule In shift value 2 carry out the arrangement schematic diagram of opposite integral shift；
Figure 14 is the flow diagram of the specific embodiment of the method for reseptance of leading symbol of the invention；
Figure 15 is that the peak value of the first common leading symbol in the embodiment of the present invention corresponding to three-stage structure CAB obtains The logical schematic taken；
Figure 16 is that the peak value of second of common leading symbol in the embodiment of the present invention corresponding to three-stage structure BCA obtains The logical schematic taken；
Figure 17 is the logical schematic that the first in the embodiment of the present invention reinforces that the peak value of leading symbol obtains；And
Figure 18 is the logical schematic that the peak value of second of reinforcement leading symbol in the embodiment of the present invention obtains.
Specific embodiment
Inventor has found do not have cyclic prefix in DVB_T2 spatial structure, no in current DVB_T2 standard and other standards It can be suitably used for relevant detection, and leading symbol low complex degree receiving algorithm under complex frequency Selective Fading Channel detects The problem of existing probability of failure.
In view of the above-mentioned problems, inventor after study, provides the generation method and method of reseptance of a kind of leading symbol, solution The problem of noncoherent detection of having determined performance declines has good fractional part of frequency offset estimation performance and Timing Synchronization performance, may be used also It avoids the problem that the small inclined estimation failure occurred under certain particular length multipath channels, guarantees related using delay in receiving end The peak value that may be significantly avoids and above-mentioned error detection peak value is in the presence of.
It is understandable in order to enable the above objects, features and advantages of the present invention to become apparent, with reference to the accompanying drawing to this hair Bright specific embodiment is described in detail.
Fig. 1 is the flow diagram of the embodiment of the generation method of leading symbol of the invention.As shown in Figure 1, this implementation The generation method of leading symbol includes the following steps: in example
Step S1-1: time domain main running signal is obtained；
Step S1-2: it is generated based on acquired time domain main running signal with the first three-stage structure and second of three sections of knots The time-domain symbol of any one three-stage structure in structure；And
Step S1-3: generating leading symbol based on one or two time-domain symbols,
Wherein, the first three-stage structure are as follows: before time domain main running signal, the rear portion based on the time domain main running signal are generated Sew and the suffix of the modulated generation in rear portion based on the time domain main running signal, second of three-stage structure are as follows: time domain main body letter Number, the prefix generated of the rear portion based on the time domain main running signal and the modulated life in rear portion based on the time domain main running signal At in advance sew.
When generating leading symbol when being based on a time-domain symbol, which is common leading symbol；When based on two When splicing generates leading symbol when the time-domain symbol of a difference three-stage structure, which is to reinforce leading symbol.
Fig. 2 is the schematic diagram of three-stage structure in the common leading symbol of the first in the embodiment of the present invention.Fig. 3 is the present invention Embodiment in second of common leading symbol three-stage structure schematic diagram.
By one section of time domain main running signal (being indicated in figure using A) as first part, the least significant end of neat first part is according to pre- The fixed rule that obtains takes out a part, and the front next life of the first part is handled and copied to according to the first predetermined process rule At Part III (being indicated in figure using C) thus as prefix, meanwhile, it is taken out from the rear portion of first part according to predetermined acquisition rule A part is handled according to the second predetermined process rule and is copied to rear portion or the processing and before copying to of the first part The front sewed generates second part (indicating in figure with B) to mutually should be used as suffix respectively or sew in advance, thus, it generates respectively B as shown in Figure 2 is as the first common leading symbol (CAB structure) of suffix and B as shown in Figure 3 the sewed in advance Two kinds of common leading symbols (BCA structure).
In the present embodiment, when sending the first common leading symbol, indicate that system is sending general broadcast service；Work as hair When sending second of common leading symbol, indicate that system is sending emergent broadcast service.The present invention is also possible to send the first general When logical leading symbol, system is indicated when sending emergent broadcast service, and sending second of common leading symbol, the system of expression exists Send general broadcast service.Common leading symbol is based on the same time domain main running signal, and by the first three-stage structure, (CAB is tied Structure) and second of three-stage structure (BCA structure) in any one for identifying emergent broadcast.
It is carried out for processing specific rules about after obtaining out Part III, second part in first part, first is pre- Fixed processing rule includes: direct copying；Or to each sampled signal in taken out part multiplied by an identical fixed coefficient Or make a reservation for different coefficients.Second predetermined process rule includes: to be modulated place when the first predetermined process rule is direct copying Reason；Or when the first predetermined process rule be each sampled signal in taking-up part multiplied by an identical fixed coefficient or in advance Also multiplied by corresponding coefficient when fixed different coefficients.It is, when Part III be direct copying as prefix when, second part into It is re-used as suffix after row modulation treatment or sews in advance, and when Part III is multiplied by corresponding coefficient, second part also needs It carries out multiplied by coefficient and carries out modulation treatment, be re-used as suffix or sew in advance.
Fig. 4 is the schematic diagram for obtaining processing in the embodiment of the present invention based on the first common leading symbol.
The direct copying that C sections are A sections in the present embodiment, and the modulated signal section that B sections are A sections, as shown in figure 4, such as A Length is 1024, and the length for intercepting C is 520, and the length of B is 504, can be with wherein when carrying out certain processing to C and B To each sampling of signal multiplied by a fixed coefficient or each sampling multiplied by a different coefficient.
The data area of B is no more than the data area of C, that is, the range to the part A of modulated signal section B is selected not surpass The range of the part A as prefix C is intercepted out.Preferably, the sum of the length of B and the length of C are the length of A.
If NAFor the length of A, if LenCFor the length of C, LenBFor the length of modulated signal section B.If the sampled point serial number of A It is 0,1 ... NA- 1. set the sampled point that N1 is copied to the corresponding first part A of starting point of modulated signal section second part B as selection Serial number, N2 are the sampled point serial number for the corresponding first part A of terminal that selection is copied to modulated signal section second part B.Wherein,
N2=N1+LenB-1
In general, to B sections of second part implement be modulated to frequency modulation, M sequence or other sequences etc. are modulated, in this implementation By taking frequency modulation as an example, if P1_A (t) is the time-domain expression of A, then the time-domain expression of the first common leading symbol is
Wherein, frequency modulation value fSHIt can be chosen for the corresponding i.e. 1/N in subcarrier in frequency domain interval of time-domain OFDM symbolAT, wherein T is sampling period, NAFor the length of time-domain OFDM symbol, in this example, NAIt is 1024, takes fSH=1/1024T.And frequency modulation First phase can be arbitrarily selected, in order to keep correlation peak sharp, fSHAlso it can choose as 1/ (LenBT)。
As shown in figure 4, NA=1024；LenC=520, LenB=504, N1=520.CA sections include identical content at this time Autocorrelation lags are NA, the CB sections of autocorrelation lags comprising identical content are NA+LenB, and AB sections comprising identical content from phase Closing delay is LenB。
Fig. 5 is the schematic diagram for obtaining processing in the embodiment of the present invention based on second of common leading symbol.
Similarly, the time-domain expression of second of common leading symbol is, it is noted that in order to enable receiving end processing method to the greatest extent may be used Can be consistent, therefore in the structure of B-C-A, frequency modulation value just with C-A-B structure on the contrary, and modulation can arbitrarily select just Phase.
As shown in figure 5, NA=1024；LenC=520, LenB=504, N1=504, CA sections include identical content at this time Autocorrelation lags are NA, the BC sections of autocorrelation lags comprising identical content are LenB, and the BA sections of auto-correlations comprising identical content are prolonged It is late NA+LenB。
Fig. 6 is the schematic diagram that the first in embodiment reinforces two three-stage structures in leading symbol.Fig. 7 is in embodiment The schematic diagram of two three-stage structures in two kinds of reinforcement leading symbols.
Respectively as shown in Figure 6 and Figure 7, reinforce in two different time domain symbols of leading symbol, two time domain main body letter Number difference, and the three-stage structure used is also different, is respectively formed by the difference successively sequence of two time-domain symbols as in Fig. 6 The first reinforce leading symbol and such as second of reinforcements leading symbol in Fig. 7, for identifying emergent broadcast.
, there are two types of on the basis of common leading symbol, 2 symbols can be connected, it is leading to constitute two kinds of reinforcements Symbol.When sending the 1st kind of reinforcement leading symbol, indicate that system is sending general broadcast service；Before second of transmission is reinforced When leading symbol, indicate that system is sending emergent broadcast service.When can also send the first reinforcement leading symbol, the system of expression exists When sending emergent broadcast service, and sending second of reinforcement leading symbol, indicate that system is sending general broadcast service.
Reinforce leading symbol to be made of two general symbols, the main part (i.e. A) of the two general symbols can not Together, reinforce leading symbol in this way to transmit the capacity of signaling being twice of general leading symbol or close to twice.
The detection of common leading symbol utilizes CB sections, CA sections and BA sections of delay auto-correlation to obtain peak value, adds using When strong leading symbol, in order to enable the autocorrelation value of 2 symbols can be added, more robust performance is obtained, then 2 symbols are respectively Parameter N1 (i.e. N1 be selection be copied to modulated signal section B the corresponding A of starting point sampled point serial number) need to meet certain pass System, if the N1 of first symbol is N1_1, the N1 of second symbol is N1_2, needs to meet N1_1+N1_2=NA.And it is if right If the modulation of B sections of uses is frequency modulation, frequency deviation value wants exactly the opposite.
The symbol that C-A-B structure is indicated with serial number 1 indicates the symbol of B-C-A structure with serial number 2.Then setting P1_A (t) is A1 Time-domain expression, P2_A (t) is the time-domain expression of A2, then the time-domain expression of the first three-stage structure is
The time-domain expression of second of three-stage structure is
So, the first reinforce leading symbol time-domain expression be, here, since the sum of the length of B and length of C are The length of A, so, 2NAAs the sum of the length of B, C, A.
So, the time-domain expression of second of reinforcement leading symbol is
Fig. 8 is to reinforce the schematic diagram that leading symbol obtains processing based on the first in the embodiment of the present invention.
As shown in figure 8, a preferred embodiment is, the C section of 2 general symbols, A sections of, Ns identical with B segment lengthA= 1024；Ncp=520, LenB=504, only N1 has any different, N1_1=520, N1_2=504.As shown below, respectively the first Reinforce leading symbol and second of reinforcement leading symbol.
Take fSH=1/1024T, then the time-domain expression of the first three-stage structure be
Fig. 9 is to reinforce the schematic diagram that leading symbol obtains processing based on second in the embodiment of the present invention.
As shown in figure 9, the time-domain expression of second of three-stage structure is
For the source of the time domain main running signal in above-mentioned steps S1-1, it is generally the case that for general leading symbol Speech, time domain main running signal A is to be formed time-domain OFDM symbol after inverse fourier transform by frequency-domain OFDM symbol and obtained.
If P1_X is corresponding frequency-domain OFDM symbol, P1_XiTime-domain OFDM symbol is obtained after making inverse discrete fourier transform:
Wherein, M is effective non-zero The power of carrier wave and.
P1_X frequency-domain structure, that is, frequency-domain OFDM symbol respectively include virtual subcarrier, signaling sequence (referred to as SC) subcarrier and Fixed sequence program (referred to as FC) subcarrier three parts.
The signaling sequence subcarrier and the fixed sequence program subcarrier are arranged according to the predetermined rule that is staggered Afterwards, by the virtual subnet distribution of carriers in its two sides, the predetermined rule that is staggered is comprising any in following two rule It is a kind of:
The first predetermined rule that is staggered: it is staggeredly arranged in oem character set or even surprise；And
The second predetermined rule that is staggered: a part of signaling sequence is placed on odd subcarriers, another part signaling sequence Even subcarriers are placed on, and a part of fixed sequence program is placed on odd subcarriers, another part fixed sequence program is placed on even number load Wave.
The first predetermined rule that is staggered is that SC and FC oem character set or even odd staggered discharge, such FC are advised as pilot tone It then discharges, realizes that the predetermined rule that is staggered of channel estimation more convenient second then needs part SC sequence to be placed on odd number load Wave, remaining SC sequence are placed on even subcarriers；It needs part FC sequence to be placed on odd subcarriers simultaneously, residual F C sequence is placed on Even subcarriers thus are avoided that FC or SC are all placed on even or odd subcarrier, can all decline under certain special multipaths It falls, and such discharge can improve the complexity ignored to channel estimation, therefore be more preferably to select.
If the length of fixed sequence program is the length of L (i.e. the number of effective subcarrier of carrying fixed sequence program is L), signaling sequence Degree is P (i.e. the number of effective subcarrier of carrier signaling sequence is P), in the present embodiment, L=P.It should be noted that working as When the length of fixed sequence program and signaling sequence is inconsistent (such as P > L), it can be realized by way of zero padding sequence subcarrier Fixed sequence program and signaling sequence are staggered by above-mentioned rule.
Figure 10 is signaling sequence subcarrier in the embodiment of the present invention, fixed sequence program subcarrier and virtual subcarrier according to The arrangement schematic diagram of the one predetermined rule that is staggered.
As shown in Figure 10, in this preferred embodiment, this step includes: to fill respectively centainly in effective subcarrier two sides Null sequence subcarrier to form the frequency-domain OFDM symbol of predetermined length.
Along the example for being 1024 to predetermined length, the G=1024-L-P of the length of null sequence subcarrier, two sides filling (1024-L-P)/2 null sequence subcarrier.For example, L=P=353, then G=318, two sides are respectively filled 159 null sequence and are carried Wave.
It is comprised the steps of: by the described first predetermined frequency-domain OFDM symbol that rule generates that is staggered
(11) fixed sequence program generation step: fixed sequence program is made of 353 plural numbers, and mould is constant, the fixed sequence program N-th of value of subcarrier indicates are as follows:
Wherein, R is the power ratio of FC and SC, SCiConstant mould is 1
The fixed sequence program subcarrier radian value ωnPass through the predetermined fixed subcarrier radian value of first in following tables 1 Table determines；
Table 1 fixes subcarrier radian value table (by the first predetermined rule optimization that is staggered)
(12) signaling sequence generation step: symbiosis is at 512 signaling sequences, i.e. Seq0, Seq1... Seq511, Mei Gexin Enable sequence Seq0~Seq511Take opposite number, i.e.-Seq respectively again0~-Seq511, receiving end is to distinguish using the positive and negative of correlation Positive sequence or antitone sequence, i.e., transmit 10bit signaling information altogether, and 512 signaling sequences can be further divided into 4 groups, every group again 128 signaling sequences, it is as follows that every group of 128 signaling sequence generates sub-step:
1st sub-step: consensus sequence zc is generatedi(n), it is Zadoff-Chu sequence zc (n) that length is N:
2nd sub-step: by copying zc twicei(n) generating length is 2N's
3rd sub-step: fromIn certain specific initial position kiThe sequence that intercepted length is 353 generates SCi(n):
SCi(n)=zci *(ki- 1+n), n=0~352
Every group of signaling sequence Seq0~Seq127N value, uiWith shift value kiRespectively by each corresponding following table 2 to table 5 Predetermined signaling sequential parameter table determines.
First group of sequence Seq0~Seq127N value, uiWith shift value kiAs shown in table 2 below.
2: the first groups of signaling sequence parameters of table
Second group of sequence Seq128~Seq255Generation step it is identical with first group of sequence, N value, uiWith shift value kiSuch as Shown in the following table 3.
3: the second groups of signaling sequence parameters of table
Third group sequence Seq256~Seq383Generation step it is identical with first group of sequence, N value, uiWith shift value kiSuch as Shown in the following table 4 table.
Table 4: third group signaling sequence parameter
4th group of sequence Seq384~Seq511Generation step it is identical with first group of sequence, N value, uiWith shift value kiUnder Shown in table 5.
5: the four groups of signaling sequence parameters of table
(13) arrange filling step, will be by (11) step and the obtained fixed sequence program of (12) step and letter It enables sequence discharge by oem character set, after filling virtual subcarrier, forms the frequency-domain OFDM symbol as follows,
Figure 11 is signaling sequence subcarrier in the embodiment of the present invention, fixed sequence program subcarrier and virtual subcarrier according to The arrangement schematic diagram of the two predetermined rules that are staggered.
As shown in figure 11, the signaling sequence for the first half that left side of dotted line is located in figure is placed on odd subcarriers, in figure The signaling sequence of another half part of right side of dotted line is placed on even subcarriers, and is located at the first half fixed sequence program of left side of dotted line Even subcarriers are placed on, the rear part fixed sequence program for being located at right side of dotted line is placed on odd subcarriers.That is P1_X0,P1_X1,L, P1_X1023It is generated by the second predetermined rule that is staggered, puts odd carrier wave in front half section SC, FC puts even carrier wave, and second half section SC is put Even carrier wave, FC put odd carrier wave, and the odd even position of the signaling sequence of front and back half part, fixed sequence program is exchanged.Such fixation Sequence subcarrierSignaling sequence subcarrierLocating odd even position can be interchanged, and have no effect to transmission performance.
When filling virtual carrier, the null sequence subcarrier length of left and right sides filling be can also be different, but should not differ It is more.
Continue with the specific embodiment for providing the frequency domain symbol by the second predetermined rule optimization generation that is staggered.By The two predetermined frequency-domain OFDM symbols that rule generates that are staggered comprise the steps of:
(21) fixed sequence program generation step, the fixed sequence program generation step and phase in (11) fixed sequence program generation step Together, only fixed sequence program subcarrier radian value ωnValue determined by the second predetermined fixed subcarrier radian value table；Wherein, Second predetermined fixed subcarrier radian value table passes through as shown in table 6 below:
Table 6 fixes subcarrier radian value table (by the second predetermined rule optimization that is staggered)
(22) signaling sequence generation step, the signaling sequence generation step and (12) signaling sequence generation step phase Together,
(23) arrange filling step, by (21) step and the obtained signaling sequence of (22) step and fixed sequence program After even surprise is staggered again, after zero carrier is filled in the left and right sides, frequency-domain OFDM symbol is formed as follows by odd even,
For reinforcing leading symbol, the structure of the time-domain OFDM symbol of two time domain main running signal is in addition to including above-mentioned Outside one frequency-domain OFDM symbol generation step of meaning, in addition, the structure of two time-domain OFDM symbols can also meet arbitrarily with At least one of lower three predetermined association rules:
First predetermined association rule: the respective signaling sequence collection of two time-domain OFDM symbols is taken identical.Such as by above-mentioned If 10 bit of single symbol transmission, transmission capacity total in this way is 20 bits.
Second predetermined association rule: the fixed sequence program of second time-domain OFDM symbol is kept and first time-domain OFDM symbol Fixed sequence program it is identical.
Third predetermined association rule: including effective sub- load of fixed sequence program and signaling sequence in second time-domain OFDM symbol Wave position is that the whole of effective sub-carrier positions in first time-domain OFDM symbol is moved to left or moved to right, and shift value is usually controlled System is in the range of 0-5.
Figure 12 and Figure 13 is that two time domain main running signals that shift value is 1 and 2 are relatively whole with the progress of predetermined association rule The schematic diagram of displacement.
The generation preferred embodiment for reinforcing the frequency domain symbol of A1 and A2 in leading symbol is as follows:
The main body of first symbol A1 and the previously described common leading character generated by the second predetermined rule that is staggered Number frequency domain symbol it is identical, FC with SC sequence and frequency domain placement position and filling zero carrier are identical.
The main body of second symbol A2 and the previously described common leading character generated by the second predetermined rule that is staggered Number FC with SC sequence it is identical, and effective sub-carrier positions of A2 be A1 integrally move to left one.I.e.
Figure 14 is the flow diagram of the specific embodiment of the method for reseptance of leading symbol of the invention.
As shown in figure 14, the method for reseptance of leading symbol includes the following steps: in the present embodiment
Step S2-1: the physical frame received is handled to obtain baseband signal；
Step S2-2: judge in the baseband signal with the presence or absence of the received above-mentioned common leading symbol of expectation or before reinforcing Lead symbol；
Step S2-3: in the case where above-mentioned judging result, which is, is, position of the leading symbol in physical frame is determined simultaneously Solve signaling information entrained by the leading symbol.
Specifically, as described in step S2-1, the physical frame received is handled to obtain baseband signal.Usually connect The signal that receiving end receives is zero intermediate frequency signals, it is therefore desirable to carry out analog-to-digital conversion to it first to obtain digital signal, then carry out Baseband signal is obtained after the processing such as filtering, down-sampling.It should be noted that if what receiving end received is intermediate-freuqncy signal, right It also needs to carry out frequency spectrum shift after analog-to-digital conversion process, is then filtered again, obtains base band after the processing such as down-sampling Signal.
As described in step S2-2, judge in the baseband signal with the presence or absence of it is expected received above-mentioned common leading symbol or Person reinforces leading symbol, specifically includes following situations.
In the present embodiment, if known transmitting terminal is only possible to send common leading symbol, and it is leading to send reinforcement In the case where symbol, judge to include the following steps: in the baseband signal with the presence or absence of the received common leading symbol of expectation
Step S2-21A: according to the C section in the received common leading symbol of expectation, A sections and B sections of processing between any two Relationship and/or modulation relationship carry out delay sliding auto-correlation after carrying out necessary inverse processing and signal demodulation to baseband signal, To obtain the related accumulated value of three delays；
Step S2-21B: postponing one, two or three in related accumulated value based on these three and perform mathematical calculations, And peak detection is carried out to the mathematical operation result；
Step S2-21C: if the result of peak detection meets preset condition, it is determined that there is expectation in the baseband signal Received common targeting signal.
Further, step S2-21A can according to the C section of the first common leading symbol and second of common leading symbol, A sections and B sections of predetermined acquisition rule and/or predetermined process rule between any two, obtains 2 groups of delay correlation accumulated values, often 3 values of group, and in step S2-21B comprising to three of every group in this 2 groups one, two postponed in related accumulated values or Three perform mathematical calculations, and carry out peak detection to the mathematical operation result.If wherein first group of peak detection meets default Condition, it is determined that exist in the baseband signal and it is expected the first received common targeting signal；If second group of peak detection is full Sufficient preset condition, it is determined that exist in the baseband signal and it is expected received second of common targeting signal；If occurring two groups all The case where meeting need separately to judge, for example the explicitly for the ratio that can be made an uproar with two groups of peak is judged.
On this basis, if leading symbol is reinforced in the only possible transmission of known transmitting terminal, and common leading character can not be sent In the case where number, judge to include the following steps: in the baseband signal with the presence or absence of the received reinforcement leading symbol of expectation
Step S2-22A: according to the C of C-A-B structure and B-C-A structure section, A sections in the received common leading symbol of expectation And B sections of predetermined acquisition rules and/or predetermined process rule between any two, necessary correspondingly inverse processing is carried out to baseband signal And delay sliding auto-correlation is carried out after signal demodulation, to obtain the related accumulated value of six delays, this six values can be actually only by 3 A delay autocorrelator is completed；In addition, when the FC sequence of 2 symbols of reinforcement leading symbol uses identical, before also can be obtained The delay correlation accumulated value of the combined and spliced part of the C+A section of 2 symbols afterwards；
Step S2-22B: postpone related accumulated value for six of step S2-22A and be added with same delay relationship Or it is added after phase adjustment；The related accumulated value of three different delays is obtained, postpones related accumulated value and front and back 2 based on these three One, two, three or four in the related accumulated value of the delay of the combined and spliced part of A sections of the C section of a symbol is counted Student movement is calculated, and carries out peak detection to the mathematical operation result；
Step S2-22C: if the result of peak detection meets preset condition, it is determined that there is expectation in the baseband signal Received reinforcement targeting signal.
Further, step S2-22A can reinforce the symbol of leading symbol and second of reinforcement leading symbol according to the first Internal and intersymbol different delays relationship obtains 2 groups of delay correlation accumulated values, every group of 6 values, and works as and reinforce leading symbol 2 symbols FC sequence using it is identical when, the also C+A section delay correlation accumulated value of 2 symbols in available 2 groups of front and backs；And it walks Comprising postponing being added for related accumulated value same delay to 6 of every group in this 2 groups in rapid S2-22B；Obtain 2 groups every group Related accumulated value comprising 3 different delays；And based on the related accumulated value of every group in this 2 groups of three delays and the symbol of front and back 2 Number A sections of C section combined and spliced part the related accumulated value of delay in one, two, three or four progress mathematics fortune It calculates, and peak detection is carried out to the mathematical operation result.If wherein first group of peak detection meets preset condition, it is determined that described Exist in baseband signal and it is expected the first received reinforcement targeting signal；If second group of peak detection meets preset condition, really Exist in the fixed baseband signal and it is expected received second of reinforcement targeting signal；If being needed there is a situation where two groups all meet Separately judge, for example the explicitly of the ratio that can be made an uproar with two groups of peak is judged.
If transmitting terminal may send reinforcement leading symbol, it is also possible to, then should be into the case where sending common leading symbol The common leading symbol detection of the above-mentioned S2-21 of row will also carry out the reinforcement leading symbol detection of above-mentioned S2-22, be not repeated herein It repeats, due to reinforcing the structure that leading symbol necessarily includes common leading symbol, when both meeting preset condition, if reinforcing The peak value of leading symbol is better than the peak value of common leading symbol by certain threshold value, then is judged as reinforcement leading symbol, otherwise judges For common leading symbol.
For the embodiment being previously mentioned, the peak value of common leading symbol obtains block diagram can be as shown in Figure 15 and Figure 16. Figure 15 is the logic that the peak value in the embodiment of the present invention corresponding to the first common leading symbol of three-stage structure CAB obtains Schematic diagram.Figure 16 is that the peak value of second of common leading symbol in the embodiment of the present invention corresponding to three-stage structure BCA obtains The logical schematic taken.
Identical part in Figure 15 and Figure 16 only needs a set of reception resource, and diagram is stated for clarity therefore separated.Its C in middle figure, A, B respectively indicates the length of C sections, A sections and B segment signal, and moving average filter can be power normalization Filter.In detail in this figure, meet C+B=A.
The peak value acquisition block diagram for reinforcing leading symbol can be as shown in Figure 17 and Figure 18.Figure 17 is in the embodiment of the present invention A kind of logical schematic that peak value that reinforcing leading symbol obtains.Figure 18 is that second of reinforcement is leading in the embodiment of the present invention The logical schematic that the peak value of symbol obtains.
Specifically, as described in step S2-3, in the case where above-mentioned judging result, which is, is, determine the leading symbol in physics Position in frame and to solve signaling information entrained by the leading symbol include step in detail below.
Determine position of the leading symbol in physical frame include: the result based on the peak detection for meeting preset condition come Determine position of the leading symbol in physical frame.
Received leading symbol it is expected if it exists, determines that leading symbol exists according to the big part value of peak value or maximum value The position occurred in physical frame.Fractional part of frequency offset estimation can also be carried out using the result of peak detection.
Signaling information entrained by the leading symbol is solved in the step S2-3 to include the following steps: to utilize leading symbol All or part of time domain waveform and/or all or part of time domain waveform of the leading symbol obtained after Fourier transformation Frequency-region signal, to solve signaling information entrained by the leading symbol.
By the inclusion of the signal and signaling sequence t easet ofasubcarriers or the signaling sequence subcarrier collection of signaling sequence subcarrier It closes corresponding time-domain signal and carries out operation, to solve the signaling information as entrained by signaling sequence subcarrier in the leading symbol. Wherein signaling sequence t easet ofasubcarriers are generated based on known signaling sequence set.
Wherein, the signal comprising signaling sequence subcarrier includes: all or part of time domain of the leading symbol received Waveform, or 1 or 2 frequency domains being obtained after being fourier transformed from interception 1 or 2 main body OFDM symbols in leading symbol OFDM symbol.Signaling sequence t easet ofasubcarriers be filled by signaling sequence each in signaling sequence set on effective subcarrier and The set of formation.
Specifically, the N of 1 or 2 corresponding ODFM symbol main body is interceptedAAfter the time-domain signal of length carries out Fourier transform 1 obtained or 2 frequency-domain OFDM symbols；Then, zero carrier is removed, 1 received is taken out according to signaling sub-carriers position Or 2 frequency domain signaling sub-carriers.It is carried out specifically with above-mentioned channel estimation value and known signaling sequence subcarrier collection Frequency domain decoding function is completed in mathematical operation.
For example, setting i=0:M-1, M is signaling sub-carriers number, j=0:2P- 1, P, which are that frequency domain is transmitted, enables bit number, i.e., Corresponding signaling sub-carriers collection shares 2PA element, and each element corresponds to the sequence that length is M, HiFor each signaling sub-carriers pair The channel estimation value answered, SC_reciFor the frequency domain signaling sub-carriers value received,It is j-th of signaling sequence subcarrier concentration I-th of value in element.ThenTake max (corrj) corresponding J to get arrive frequency-domain transmission signaling information.
In other embodiments, the above process can also carry out in the time domain, be passed through using known signaling sequence subcarrier collection The frequency domain symbol of the corresponding length generated after zero padding in place time domain signaling waveform corresponding after Fourier inversion Collection directly synchronizes related to the time-domain received signal for obtaining multipath accurate location, takes correlation maximum absolute value that, The signaling information of frequency-domain transmission can also be solved, which is not described herein again.
Further, receiving end can also do integer frequency offset estimation or channel estimation using fixed sequence program, i.e., of the invention Leading symbol method of reseptance can with the following steps are included:
1) according to position of the leading symbol in physical frame is determined, interception includes the signal of fixed subcarrier；
It 2) include the signal and frequency domain stator carrier wave sequence or the frequency domain stator carrier wave sequence for fixing subcarrier by this Corresponding time-domain signal carries out operation, to obtain integer frequency offset estimation or channel estimation.
Specifically, the present embodiment includes the following steps: 1) to cut according to position of the leading symbol in physical frame is determined Take the signal comprising fixed subcarrier；It 2) include the signal and frequency domain stator carrier wave sequence or the frequency domain for fixing subcarrier by this The corresponding time-domain signal of stator carrier wave sequence carries out operation, to obtain integer frequency offset estimation or channel estimation.
Wherein, the signal comprising fixed subcarrier includes: all or part of time domain of the leading symbol received Waveform, or the frequency-domain OFDM symbol obtained after being fourier transformed from interception time-domain OFDM symbol in leading symbol.
The two methods that receiving end carries out integer frequency offset estimation are detailed below.
Method 1:
According to position of the leading symbol detected in physical frame, the time domain waveform of the leading symbol received is intercepted All or part.By the way of frequency sweep, i.e., with fixed frequency variation step diameter (for example, between corresponding integer frequency offset Every), after the upper different frequency deviation of part time domain waveform modulation, obtain several time-domain signals:T is sampling period, fsFor sample frequency.And known frequency domain fixed sequence program It is A2 that carrier wave, which carries out the corresponding time-domain signal of inverse fourier transform, using A2 as known signal and each A1yIt is related to carry out sliding, Choose that A1 for maximum correlation peaks occury, then the frequency deviation value y modulated to it is integer frequency offset estimation value.
Wherein, the frequency deviation region fought required for swept frequency range correspondence system, for example, needing to fight the frequency of positive and negative 500K Partially, and systematic sampling rate be 9.14M, leading symbol main body be 1K length, then swept frequency range beI.e. [- 57, 57]。
Used correlation can be with FFT and IFFT come equivalent implementation in frequency sweep, and which is not described herein again.
Method 2:
Frequency-domain OFDM is obtained after corresponding to the time-domain signal progress Fourier transform of ODFM symbol main body in interception leading symbol The frequency-domain OFDM symbol that transformation obtains is carried out the cyclic shift of above-mentioned swept frequency range, and presses the position of FC on sub-carriers by symbol It sets and the interval of the fixed sequence program subcarrier of front and back 2 carries out the multiplication of dot interlace difference, and the dot interlace with known fixed sequence subcarrier Difference multiplied value carries out related operation, obtains a series of correlations, chooses the corresponding cyclic shift of maximum related value, can be corresponding Obtain available integer frequency offset estimation value.
Further, when judging to have the received reinforcement leading symbol of expectation in the baseband signal, if reinforcing leading The shift value of the effective sub-carrier positions of symbol is even number, also the time-domain signal of 2 corresponding ODFM symbol main bodys can be carried out Fourier The 2 frequency-domain OFDM symbols obtained after leaf transformation will convert 2 obtained frequency-domain OFDM symbols while carry out above-mentioned swept frequency range Same loop displacement, each symbol reception value after displacement and the symbol known fixed sequence sub-carrier values conjugate multiplication, and After the multiplied value of 2 same sub-carrier positions of symbol is carried out conjugate multiplication again, by all effective FC of 2 symbol common locations The conjugate multiplication value of subcarrier adds up, i.e.,J ∈ swept frequency range, Ri,1,j To correspond to the reception value on the position FC, R after shifted j on first symbol frequency domaini,2,jFor shifted j on second symbol frequency domain The reception value on the position FC is corresponded to afterwards,WithRespectively on some subcarrier of first symbol and second symbol FC given value, M are known FC total number, obtain a series of accumulated values corresponding to each cyclic shift value in this way, are chosen maximum tired Value added corresponding cyclic shift can accordingly obtain available integer frequency offset estimation value.
Using the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier received and/or its into The corresponding time-domain signal of row inverse fourier transform completes channel estimation, equally can choose time domain carry out and/or frequency domain into Row, details are not described herein.

Claims (24)

1. a kind of transmitter characterized by comprising
Leading symbol generation module is generated based on acquired time domain main running signal with any one three sections in following two kinds The time-domain symbol of structure, for generating leading symbol,
Wherein, the first described three-stage structure are as follows: the time domain main running signal, the whole based on the time domain main running signal or portion It is mitogenetic at prefix and based on the prefix in whole or in part modulate generation suffix,
Second of three-stage structure are as follows: the time domain main running signal, all or part of institute based on the time domain main running signal What the prefix of generation and modulating in whole or in part based on the prefix generated sews in advance.
2. transmitter as described in claim 1, it is characterised in that:
Wherein, the first described three-stage structure are as follows: the time domain main running signal, the rear portion based on the time domain main running signal are generated Prefix and the modulated generation in rear portion based on the prefix suffix,
Second of three-stage structure are as follows: before the time domain main running signal, the rear portion based on the time domain main running signal are generated Sew and the advanced of the modulated generation in rear portion based on the prefix is sewed.
3. transmitter as described in claim 1, it is characterised in that:
Wherein, common leading symbol is generated when being based on a time-domain symbol, is spelled when being based on multiple time-domain symbols It delivers a child into and reinforces leading symbol, multiple time-domain symbols have the time-domain symbol of the three-stage structure of Any Digit independent assortment.
4. transmitter as described in claim 1, it is characterised in that:
Wherein, the time domain main running signal is to carry out inverse discrete fourier transform to the frequency-domain OFDM symbol of predetermined length and obtain Time-domain OFDM symbol.
5. transmitter as described in claim 1, it is characterised in that:
In the prefix, the suffix or the generation step sewed in advance, include:
Using the time domain main running signal as first part, taken out from the least significant end of the first part according to predetermined acquisition rule A part, handled according to the first predetermined process rule and copy to the front of the first part come generate Part III to As the prefix, meanwhile, a part is taken out from the rear portion of the first part according to predetermined acquisition rule, it is predetermined according to second The regular rear portion for being handled and copying to the first part of processing or processing simultaneously copy to the front of the prefix to generate Second part is to mutually should be used as the suffix respectively or described sew in advance.
6. transmitter as claimed in claim 5, which is characterized in that
Wherein, the predetermined acquisition rule includes:
If LenBFor the length of the second part, LenCFor the length of the Part III, LenB≤LenC, set N1 separately as selection It is copied to the sampled point serial number of the corresponding first part of starting point of the second part, N2 is that selection is copied to described second The sampled point serial number of the corresponding first part of partial terminal, then meet following formula: N2=N1+LenB-1。
7. transmitter as claimed in claim 6, it is characterised in that:
Wherein, the first predetermined process rule includes: direct copying；Or
Multiplied by an identical fixed coefficient or different coefficients are made a reservation for each sampled signal in taken out part,
The second predetermined process rule includes: to be modulated processing when the first predetermined process rule is direct copying； Or
When the first predetermined process rule by each sampled signal in taking-up part multiplied by an identical fixed coefficient or Also multiplied by carrying out modulation treatment after corresponding coefficient when making a reservation for different coefficients.
8. transmitter as claimed in claim 5, which is characterized in that
The Part III is obtained based on first part's direct copying, and the second part is based on the first part Frequency modulation obtains,
To divide into the time-domain expression that P1_A (t) is the first part, then the time-domain expression of the first three-stage structure Meet following relationship:
Wherein, frequency modulation value fSHIt can be chosen for the corresponding i.e. 1/N in subcarrier in frequency domain interval of time-domain OFDM symbolAT, and modulate just Mutually any selection, T is sampling period, NAFor the length of time-domain OFDM symbol, LenBFor the length of the second part, LenCFor The length of the Part III, N1 are the sampled point for the corresponding first part of starting point that selection is copied to the second part Serial number.
9. transmitter as claimed in claim 8, which is characterized in that
To divide into the time-domain expression that P1_A (t) is the first part, then the time-domain expression of second of three-stage structure Meet following relationship:
Wherein, the frequency modulation value in second of three-stage structure is opposite with the frequency modulation value in the first described three-stage structure For-fSH, and modulation can arbitrarily select first phase.
10. transmitter as described in claim 1, which is characterized in that
Indicate that the symbol of the first three-stage structure and serial number 2 indicate the symbol of second of three-stage structure using serial number 1 Number, then the time-domain expression that P1_A (t) is time domain main running signal in the first described three-stage structure is set, P2_A (t) is described The time-domain expression of time domain main running signal in two kinds of three-stage structures,
Wherein, fSHIt can be chosen for the corresponding i.e. 1/N in subcarrier in frequency domain interval of time-domain OFDM symbolAT, T are sampling period, NAFor when The length of domain OFDM symbol, LenBFor the length of the second part, LenCFor the length of the Part III, N1_1, N1_2 are Selection is copied to the sampled point serial number of the corresponding first part of starting point of the second part,
The then time-domain expression of the symbol of the first three-stage structure are as follows:
The then time-domain expression of the symbol of second of three-stage structure are as follows:
11. transmitter as claimed in claim 10, which is characterized in that
Wherein, the time-domain expression of the first reinforcement leading symbol are as follows:
The time-domain expression of second of reinforcement leading symbol are as follows:
12. a kind of receiver, which comprises the steps of:
Step S2-1: the physical frame received is handled to obtain baseband signal；
Step S2-2: judge in the baseband signal with the presence or absence of leading symbol described in the received claim 1 of expectation；
Step S2-3: it when being judged as YES, determines position of the leading symbol in physical frame and solves entrained by the leading symbol Signaling information.
13. receiver as claimed in claim 12, which is characterized in that
The physical frame is handled to obtain baseband signal and include the following steps:
When the signal received is zero intermediate frequency signals, after analog-to-digital conversion, then filter, down-sampling handles to obtain the base band letter Number,
When the signal received is intermediate-freuqncy signal, frequency spectrum shift after analog-to-digital conversion, then filter, down-sampling handles to obtain the base Band signal.
14. receiver as claimed in claim 12, it is characterised in that:
In the case where there is the only possible transmission of known transmitting terminal the leading symbol of multiple three-stage structures to reinforce leading symbol, sentence Include the following steps: in the baseband signal of breaking with the presence or absence of the received reinforcement leading symbol of expectation
Step S2-22A: according to it is expected in received reinforcement leading symbol the first described three-stage structure and second described three sections The predetermined acquisition rule and/or predetermined process rule of first part, first part and the second part of structure between any two are right Baseband signal carries out delay sliding auto-correlation after carrying out correspondingly inverse processing and signal demodulation, related cumulative to obtain delay Value；
Step S2-22B: by postpone related accumulated value have same delay relationship be added or phase adjustment after be added, obtain To the related accumulated value of different delays, tired out based on delay correlation and performed mathematical calculations, and peak value is carried out to the mathematical operation result Detection；
Step S2-22C: if the result of peak detection meets preset condition, it is determined that there is the received targeting signal of expectation.
15. receiver as claimed in claim 14, it is characterised in that:
Step S2-22A can be reinforced according to the first inside the symbol of leading symbol and second of reinforcement leading symbol and intersymbol Different delays relationship, obtain 2 groups of delay correlation accumulated values, every group of 6 values, and when two symbols for reinforcing leading symbol When fixed sequence program uses identical, the Part III of also available 2 groups of former and later two symbols and the combined and spliced portion of first part The section divided postpones related accumulated value, also, includes the related accumulated value phase of 6 delays to every group in this 2 groups in step S2-22B Be added with delay；Obtain the 2 groups every group related accumulated value comprising 3 different delays；And based on every group in this 2 groups three The related accumulated value of a delay is related to the delay of combined and spliced part of the Part III of former and later two symbols and first part At least one of accumulated value performs mathematical calculations, and carries out peak detection to the mathematical operation result,
Wherein, if first group of peak detection meets preset condition, it is determined that it is received described to there is expectation in the baseband signal The first reinforces targeting signal；
If second group of peak detection meets preset condition, it is determined that exist in the baseband signal and it is expected received described second Reinforce targeting signal；
If two groups of the case where all meeting, need further to be judged with the make an uproar explicitly of ratio of two groups of peaks.
16. receiver as claimed in claim 12, which is characterized in that
Position of the determination leading symbol in physical frame include: the result based on the peak detection for meeting preset condition come Determine position of the leading symbol in physical frame,
Received leading symbol it is expected if it exists, determines leading symbol in object according to the big locating partial value of peak value or maximum value The position occurred in reason frame or progress fractional part of frequency offset estimation.
17. receiver as claimed in claim 12, which is characterized in that
Pass through Fu using all or part of time domain waveform of leading symbol and/or all or part of time domain waveform of the leading symbol In the frequency-region signal that obtains after leaf transformation, included the following steps: with solving signaling information entrained by the leading symbol
By the inclusion of the signal and signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers pair of signaling sequence subcarrier The time-domain signal answered carries out operation, to solve the signaling information as entrained by signaling sequence subcarrier in the leading symbol, wherein Signaling sequence t easet ofasubcarriers are generated based on known signaling sequence set.
18. receiver as claimed in claim 12, which is characterized in that further include following steps:
1) according to position of the leading symbol in physical frame is determined, interception includes the signal of fixed subcarrier；
2) signal for including fixed subcarrier is corresponding with frequency domain stator carrier wave sequence or the frequency domain stator carrier wave sequence Time-domain signal carry out operation, to obtain integer frequency offset estimation or channel estimation.
19. receiver as claimed in claim 18, which is characterized in that
Obtaining integer frequency offset estimation includes:
According to position of the leading symbol detected in physical frame, the whole of the time domain waveform of the leading symbol received is intercepted Or a part；
By after the upper different frequency deviation of part time domain waveform modulation by the way of frequency sweep, several time-domain signals are obtained；And
Known frequency domain fixed sequence program subcarrier carries out the corresponding time-domain signal of inverse fourier transform, as known signal and it is each when Domain signal carries out sliding correlation, and maximum correlation peaks occurs in selection, then the frequency deviation value modulated to it is that integer frequency offset is estimated Evaluation,
Wherein, the frequency deviation region fought required for swept frequency range correspondence system.
20. receiver as claimed in claim 18, which is characterized in that
Obtaining integer frequency offset estimation includes:
It is corresponded in interception leading symbol after time domain main running signal carries out Fourier transform and obtains frequency-domain OFDM symbol, carry out frequency sweep model The cyclic shift enclosed, and the multiplication of dot interlace difference is carried out, and carry out phase with the dot interlace difference multiplied value of known fixed sequence subcarrier Operation is closed, a series of correlations are obtained, the corresponding cyclic shift of maximum related value is chosen, can accordingly obtain integer frequency offset and estimate Evaluation,
Wherein, the frequency deviation region fought required for swept frequency range correspondence system.
21. receiver as claimed in claim 18, which is characterized in that
Obtaining integer frequency offset estimation includes the following:
When judgement, which exists, it is expected received reinforcement leading symbol, if reinforcing effective subcarrier position of 2 symbols in leading symbol The shift value set is even number, by the corresponding 2 obtained frequency-domain OFDM symbols of 2 time domain main running signals, while carrying out swept frequency range Same loop displacement, each symbol reception value after displacement and the symbol known fixed sequence sub-carrier values conjugate multiplication, and After the multiplied value of 2 same sub-carrier positions of symbol is carried out conjugate multiplication again, 2 all of symbol common location are effectively consolidated The conjugate multiplication value of sequencing column subcarrier adds up, wherein the frequency deviation region fought required for swept frequency range correspondence system.
22. receiver as claimed in claim 12, which is characterized in that
Wherein, using the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier that receive and/or its It carries out the corresponding time-domain signal of inverse fourier transform and completes channel estimation, completed in time domain and/or in frequency domain.
23. a kind of generation method of leading symbol characterized by comprising
The time-domain symbol with any one three-stage structure in following two kinds is generated based on acquired time domain main running signal, is used In generate leading symbol,
Wherein, the first described three-stage structure are as follows: the time domain main running signal, the whole based on the time domain main running signal or portion It is mitogenetic at prefix and based on the prefix in whole or in part modulate generation suffix,
Second of three-stage structure are as follows: the time domain main running signal, all or part of institute based on the time domain main running signal What the prefix of generation and modulating in whole or in part based on the prefix generated sews in advance.
24. a kind of method of reseptance of leading symbol, which comprises the steps of:
Step S2-1: the physical frame received is handled to obtain baseband signal；
Step S2-2: judge in the baseband signal with the presence or absence of leading symbol described in the received claim 23 of expectation；
Step S2-3: it when being judged as YES, determines position of the leading symbol in physical frame and solves entrained by the leading symbol Signaling information.
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