CN105282076B - The generation method of leading symbol and the generation method of frequency-domain OFDM symbol - Google Patents

The generation method of leading symbol and the generation method of frequency-domain OFDM symbol Download PDF

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Publication number
CN105282076B
CN105282076B CN201410259080.2A CN201410259080A CN105282076B CN 105282076 B CN105282076 B CN 105282076B CN 201410259080 A CN201410259080 A CN 201410259080A CN 105282076 B CN105282076 B CN 105282076B
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sequence
signaling sequence
value
signaling
ofdm symbol
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CN105282076A (en
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张文军
徐洪亮
黄戈
邢观斌
何大治
管云峰
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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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Priority to CN201410259080.2A priority patent/CN105282076B/en
Priority to CN201611106875.5A priority patent/CN106850485A/en
Priority to CN201611199976.1A priority patent/CN106998312B/en
Priority to PCT/CN2015/076808 priority patent/WO2015158292A1/en
Priority to KR1020167032043A priority patent/KR101974621B1/en
Priority to CA3212005A priority patent/CA3212005A1/en
Priority to CA2945858A priority patent/CA2945858C/en
Priority to CA2945854A priority patent/CA2945854A1/en
Priority to PCT/CN2015/076814 priority patent/WO2015158295A1/en
Priority to KR1020207014009A priority patent/KR102223654B1/en
Priority to KR1020167032057A priority patent/KR101975551B1/en
Priority to KR1020197018441A priority patent/KR102114352B1/en
Priority to PCT/CN2015/076815 priority patent/WO2015158296A1/en
Priority to US15/304,851 priority patent/US11071072B2/en
Priority to US15/304,857 priority patent/US10148476B2/en
Priority to US15/304,854 priority patent/US10778484B2/en
Priority to CA2945857A priority patent/CA2945857C/en
Priority to CA2945856A priority patent/CA2945856C/en
Priority to PCT/CN2015/076813 priority patent/WO2015158294A1/en
Priority to KR1020167032055A priority patent/KR102048221B1/en
Priority to US15/304,856 priority patent/US10574494B2/en
Priority to KR1020167032059A priority patent/KR102062221B1/en
Priority to KR1020197038044A priority patent/KR102196222B1/en
Priority to CA3211647A priority patent/CA3211647A1/en
Priority to KR1020207035510A priority patent/KR102234307B1/en
Priority to KR1020167032058A priority patent/KR102033742B1/en
Priority to KR1020197012400A priority patent/KR102108291B1/en
Priority to PCT/CN2015/076812 priority patent/WO2015158293A1/en
Priority to KR1020197033488A priority patent/KR102191859B1/en
Priority to CA2945855A priority patent/CA2945855A1/en
Priority to US15/304,853 priority patent/US10411929B2/en
Priority to KR1020207036622A priority patent/KR102347011B1/en
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Priority to US16/992,041 priority patent/US11088885B2/en
Priority to US16/992,039 priority patent/US11082274B2/en
Priority to US16/992,040 priority patent/US11128504B2/en
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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
    • H04L27/261—Details of reference signals
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals

Abstract

The invention discloses the generation methods of leading symbol in a kind of generation method of frequency-domain OFDM symbol and physical frame, and wherein the generation method of frequency-domain OFDM symbol comprises determining that the average power ratio of fixed sequence program and signaling sequence；Fixed sequence program and signaling sequence set are generated respectively on frequency domain according to average power ratio R；A signaling sequence is selected from signaling sequence set, fixed sequence program and signaling sequence are filled to effective subcarrier, and is arranged between fixed sequence program and signaling sequence in oem character set；Null sequence subcarrier is filled respectively in effective subcarrier two sides to form the frequency-domain OFDM symbol of predetermined length；Wherein, serial number of the selected signaling sequence in set is the signaling information of OFDM symbol carrying.The technical program solves in current DVB_T2 standard and other standards, and the problem of probability of failure occurs in leading symbol low complex degree receiving algorithm detection under frequency selective fading channels.

Description

The generation method of leading symbol and the generation method of frequency-domain OFDM symbol
Technical field
The present invention relates to wireless broadcast communication technical field, in particular to a kind of the generation method and object of frequency-domain OFDM symbol Manage the generation method of leading symbol in frame.
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, and leading symbol is as physical frame Start (being named as P1 symbol), only occur a P1 symbol in each physical frame or multiple P1 symbols continuously occur, it indicates The beginning of the physical frame.The purposes of P1 symbol includes:
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 so that receiving end can carry out after continued access Receipts processing；
3) original carrier frequency deviation and timing error are detected, reaches 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 CAB structure, cause to estimate that carrier wave integer frequency offset occurs on frequency domain Mistake.In addition, in complex frequency Selective Fading Channel, such as when long multipath, DBPSK differential decoding may also can fail. Moreover, because there is no cyclic prefix in DVB_T2 spatial structure, if being combined with the frequency-domain structure for needing to carry out channel estimation, will make The problem of at its channel estimation in frequency domain performance degradation.
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 method of frequency-domain OFDM symbol, including it is as follows Step: the average power ratio R of fixed sequence program and signaling sequence is determined；It generates and fixes respectively on frequency domain according to the average power ratio Sequence and signaling sequence set；A signaling sequence is selected from signaling sequence set, and fixed sequence program and the signaling sequence are filled out It is charged on effective subcarrier, and is arranged between the fixed sequence program and signaling sequence in oem character set；In effective subcarrier Fill null sequence subcarrier respectively to form the frequency-domain OFDM symbol of predetermined length in two sides；Wherein, selected signaling sequence is collecting Serial number in conjunction is the signaling information of OFDM symbol carrying.
The embodiment of the invention also provides a kind of generation methods of leading symbol in physical frame, include the following steps: to pre- The frequency-domain OFDM symbol of measured length makees inverse discrete fourier transform to obtain time-domain OFDM symbol；Wherein, the frequency-domain OFDM symbol It number is obtained according to the generation method of above-mentioned frequency-domain OFDM symbol；From the time-domain OFDM symbol interception circulating prefix-length when Domain OFDM symbol is as cyclic prefix；The time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulation letter Number；Leading symbol is generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal.
Compared with prior art, technical solution of the present invention has the advantages that
The generation method of the frequency-domain OFDM symbol provided according to embodiments of the present invention, by fixed sequence program and signaling sequence with surprise Even staggered mode is filled to effective subcarrier, in this way specific frequency-domain structure design, and wherein fixed sequence program can be made For the pilot tone in physical frame, consequently facilitating receiving end is decoded demodulation to leading symbol in the physical frame received.
Further, in the method that fixed sequence program is generated on frequency domain, it is fixed that each element, which is mould, in fixed sequence program Value, and argument is the plural number of arbitrary value between 0 to 2 π.In the method for generating signaling sequence set on frequency domain, of signaling sequence Number is 2 integral number power, and length based on signaling sequence and number determine that CAZAC sequence generates the root value in formula, really The digit k of fixed a different set of q value and corresponding cyclic shift, and signaling sequence is thus calculated.
Moreover, inventor has obtained an effect preferably fixed signaling, the preferable signaling sequence of one group of effect in practice The position of selection 128 groups of q values and cyclic shift in the length and number of column and corresponding four root values and each root value Number.So that the leading symbol being subsequently generated has lower papr (Peak to Average Power Ratio, PAPR), and improve the probability of success of receiving end detection leading symbol.
Further, using the modulated signal of time-domain OFDM symbol and the structure of time-domain OFDM symbol (as leading character Number) it ensure that the peak value for utilizing delay correlation may be significantly in receiving end.Also, during generating the leading symbol, Design time-domain OFDM symbol modulated signal can to avoid receiving end by continuous wave CO_2 laser perhaps mono-tone interference or occur with The isometric multipath channel of modulated signal length, or receive and occur when protection interval length is identical with modulated signal length in signal Error detection peak value.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of the specific embodiment of the generation method of frequency-domain OFDM symbol of the invention；
Fig. 2 is the process signal of the specific embodiment of the generation method of leading symbol in a kind of physical frame of the invention Figure；
Fig. 3 is the spatial structure schematic diagram of leading symbol in a kind of physical frame of the invention.
Specific embodiment
Inventor has found in current DVB_T2 standard and other standards that leading symbol is low under frequency selective fading channels There is the problem of probability of failure in the detection of complexity receiving algorithm.In addition, there is no cyclic prefix, Bu Nengshi in DVB_T2 spatial structure For relevant detection, and leading symbol low complex degree receiving algorithm detection appearance failure under frequency selective fading channels is general The problem of rate.
In view of the above-mentioned problems, inventor after study, provides the generation method and frequency of leading symbol in a kind of physical frame The generation method of domain OFDM symbol guarantees that carrier frequency offset receiving end within the scope of -500kHz to 500kHz still can handle Receive signal.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention Specific embodiment be described in detail.
As shown in Fig. 1 a kind of process of the specific embodiment of the generation method of frequency-domain OFDM symbol of the invention is shown It is intended to.With reference to Fig. 1, the generation method of frequency-domain OFDM symbol includes the following steps:
Step S11: the average power ratio R of fixed sequence program and signaling sequence is determined；
Step S12: fixed sequence program and signaling sequence set are generated respectively on frequency domain according to average power ratio R；
Step S13: selecting a signaling sequence from signaling sequence set, by fixed sequence program and the signaling sequence fill to On effective subcarrier, and arranged between the fixed sequence program and signaling sequence in oem character set；
Step S14: null sequence subcarrier is filled respectively in effective subcarrier two sides to form the frequency domain of predetermined length OFDM symbol；Wherein, serial number of the selected signaling sequence in set is the signaling information of the OFDM symbol carrying.
Specifically, as described in step S11, the average power ratio R of fixed sequence program and signaling sequence is determined.Wherein, described Fixed sequence program includes that receiving end can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, the signaling sequence is being gathered Interior sequence is for carrying each basic configured transmission.
Wherein, the average power ratio R of fixed sequence program and signaling sequence can be adjusted according to practical application request, be selected biggish R obtains better channel estimation and whole inclined estimation performance, or the lesser R of selection to increase the power of fixed sequence program to increase The power of signaling sequence improves the practical signal-to-noise ratio on signaling carrier to improving signaling decoding performance.Therefore, fixed sequence program Average power ratio R with signaling sequence is according to whole inclined estimation performance, channel estimating performance, Xie Xinling performance and Timing Synchronization The equilibrium of energy considers and determines.
In the present embodiment, the average power ratio R of the fixed sequence program and signaling sequence is 1.When fixed sequence program length and When signaling sequence length is identical, average power ratio is the ratio between power summation.
After determining average power ratio, the Amplitude Ration of fixed sequence program and signaling sequence is just accordingly obtained.As average power ratio R It is 1, and when fixed sequence program and signaling sequence are permanent mode sequence, the Amplitude Ration of corresponding fixed sequence program and signaling sequence is
As described in step S12, fixed sequence program and signaling sequence collection are generated respectively on frequency domain according to average power ratio R It closes.
In the present embodiment, fixed sequence program being generated on frequency domain can be realized using following concrete mode:
Step S121: the length of fixed sequence program is determined；Wherein, it is fixed that each of described fixed sequence program element, which is mould, Value, and argument is the plural number of arbitrary value between 0 to 2 π.
It should be noted that the length of the fixed sequence program is less than the half of OFDM symbol length in the present embodiment.
Step S122: a fixed sequence program is selected from all optional fixed sequence programs, and is generated with good from phase The signaling sequence set of closing property and cross correlation, and based on any signaling sequence institute group in the fixed sequence program and signaling sequence set At OFDM symbol meeting required power PAR after inverse fourier transform.
Specifically, in all valued spaces of above-mentioned fixed sequence program, (it is definite value that i.e. each element, which is mould, and argument is 0 To the plural number of arbitrary value between 2 π) in, a preferred fixed sequence program out.The fixed sequence program selected needs to meet: by the fixation sequence The signaling sequence set of column-generation has good autocorrelation and cross correlation, and is based on the fixed sequence program and signaling sequence Frequency-domain OFDM symbol composed by any signaling sequence in set has lower power peak after inverse fourier transform Than (Peak-to-Average Power Ratio, PAPR), and the specific value (or numberical range) of the power PAR can To be determined according to system requirements.
In the present embodiment, signaling sequence set being generated on frequency domain can be realized using following concrete mode:
Step S123: the number of contained signaling sequence in the length and signaling sequence set of signaling sequence is determined；Wherein, institute The number for stating signaling sequence is 2 n times power, and N is positive integer；
Step S124: M signaling sequence subclass of generation respectively, and the signaling sequence in each signaling sequence subclass Number is respectively m1~mM, and
Step S125: whole signaling sequences in each signaling sequence subclass are arranged in order together to form letter Enable arrangement set；And numbering is 0~2N-1；
Wherein, the root value of each signaling sequence subclass is different, the width of each element in all signaling sequences Degree is element amplitude in fixed sequence program
Further, the present embodiment, which gives, generates the preferred of each signaling sequence subclass in above-mentioned steps S124 Embodiment, specific as follows:
Step S1241: determine that CAZAC sequence generates the root value in formula based on the number of the signaling sequence；Wherein Root value is more than or equal to twice of the number of signaling sequence.
In practice, root is prime number, and preferred root=L, the autocorrelation value of such sequence are zero.
Step S1242: according to selected root value, selecting a different set of q value to generate CAZAC sequence, wherein q value Number is equal to the number of signaling sequence, and the value of q value is integer and is greater than 0 less than root value, and the sum of any two q value differs In root value；
Step S1243: cyclic shift is carried out to generated CAZAC sequence；Wherein, the digit of cyclic shift is by corresponding Root value and q value determine.
In practical applications, the selection of the digit of q value and cyclic shift should make between all signaling sequences with low mutual Correlation, and composed frequency-domain OFDM symbol has low power PAR (Peak- after inverse fourier transform To-Average Power Ratio, PAPR).
Step S1244: needed for being calculated according to the digit of the number of identified signaling sequence, q value and cyclic shift Signaling sequence subclass.
For example, determine fixed sequence program and signaling sequence length L, root value, and preferred one group of q value and one group of circulation Digit (the q of displacementi,ki, i=0~2N- 1), the generation formula method of i-th of signaling sequence:
Firstly, generating CAZAC sequence:
Then, cyclic shift is carried out to it:
si *(n)=[s (ki-1),s(ki),...,S(root-1),s(0),...,s(ki-1)]
Finally, intercepted length is the sequence of L since the head of above-mentioned sequence:
SCi(n)=si *(n), n=0~L-1
Obtained sequence SCiIt (n) is i-th required of signaling sequence.
For example, determine that average power ratio R is 1；Fixed sequence program length is 353, amplitude 1, one be calculated Preferably fixed sequence program, as following formula indicates:
Wherein, ωnValue it is as shown in the table by rows from left to right in order:
5.43 2.56 0.71 0.06 2.72 0.77 1.49 6.06 4.82 2.10
5.62 4.96 4.93 4.84 4.67 5.86 5.74 3.54 2.50 3.75
0.86 1.44 3.83 4.08 5.83 1.47 0.77 1.29 0.16 1.38
4.38 2.52 3.42 3.46 4.39 0.61 4.02 1.26 2.93 3.84
3.81 6.21 3.80 0.69 5.80 4.28 1.73 3.34 3.08 5.85
1.39 0.25 1.28 5.14 5.54 2.38 6.20 3.05 4.37 5.41
2.23 0.49 5.12 6.26 3.00 2.60 3.89 5.47 4.83 4.17
3.36 2.63 3.94 5.13 3.71 5.89 0.94 1.38 1.88 0.13
0.27 4.90 4.89 5.50 3.02 1.94 2.93 6.12 5.47 6.04
1.14 5.52 2.01 1.08 2.79 0.74 2.30 0.85 0.58 2.25
5.25 0.23 6.01 2.66 2.48 2.79 4.06 1.09 2.48 2.39
5.39 0.61 6.25 2.62 5.36 3.10 1.56 0.91 0.08 2.52
5.53 3.62 2.90 5.64 3.18 2.36 2.08 6.00 2.69 1.35
5.39 3.54 2.01 4.88 3.08 0.76 2.13 3.26 2.28 1.32
5.00 3.74 1.82 5.78 2.28 2.44 4.57 1.48 2.48 1.52
2.70 5.61 3.06 1.07 4.54 4.10 0.09 2.11 0.10 3.18
3.42 2.10 3.50 4.65 2.18 1.77 4.72 5.71 1.48 2.50
4.89 4.04 6.12 4.28 1.08 2.90 0.24 4.02 1.29 3.61
4.36 6.00 2.45 5.49 1.02 0.85 5.58 2.43 0.83 0.65
1.95 0.79 5.45 1.94 0.31 0.12 3.25 3.75 2.35 0.73
0.20 6.05 2.98 4.70 0.69 5.97 0.92 2.65 4.17 5.71
1.54 2.84 0.98 1.47 6.18 4.52 4.44 0.44 1.62 6.09
5.86 2.74 3.27 3.28 0.55 5.46 0.24 5.12 3.09 4.66
4.78 0.39 1.63 1.20 5.26 0.92 5.98 0.78 1.79 0.75
4.45 1.41 2.56 2.55 1.79 2.54 5.88 1.52 5.04 1.53
5.53 5.93 5.36 5.17 0.99 2.07 3.57 3.67 2.61 1.72
2.83 0.86 3.16 0.55 5.99 2.06 1.90 0.60 0.05 4.01
6.15 0.10 0.26 2.89 3.12 3.14 0.11 0.11 3.97 5.15
4.38 2.08 1.27 1.17 0.42 3.47 3.86 2.17 5.07 5.33
2.63 3.20 3.39 3.21 4.58 4.66 2.69 4.67 2.35 2.44
0.46 4.26 3.63 2.62 3.35 0.84 3.89 4.17 1.77 1.47
2.03 0.88 1.93 0.80 3.94 4.70 6.12 4.27 0.31 4.85
0.27 0.51 2.70 1.69 2.18 1.95 0.02 1.91 3.13 2.27
5.39 5.45 5.45 1.39 2.85 1.41 0.36 4.34 2.44 1.60
5.70 2.60 3.41 1.84 5.79 0.69 2.59 1.14 5.28 3.72
5.55 4.92 2.64
The number for determining signaling sequence is 512, and the signaling sequence set includes 4 signaling sequence subclass, each Signaling sequence subclass includes 128 signaling sequences, and the length of signaling sequence is 353.
It is as follows that the difference of parameter used in signaling sequence is calculated according to above-mentioned fixed sequence program, in each signaling sequence subclass:
1) the root value of first signaling sequence subclass is 353；
The value of q value is all numerical value in following table:
The digit of cyclic shift is all numerical value in following table:
2) the root value of second signaling sequence subclass is 367；
The value of q value is all numerical value in following table:
The digit of cyclic shift is all numerical value in following table:
3) the root value of third signaling sequence subclass is 359；
The value of q value is all numerical value in following table:
The digit of cyclic shift is all numerical value in following table:
4) the root value of the 4th signaling sequence subclass is 373；
The value of q value is all numerical value in following table:
The digit of cyclic shift is all numerical value in following table:
As described in step S13, a signaling sequence is selected from signaling sequence set, by fixed sequence program and the signaling sequence On filling to effective subcarrier, and arranged between the fixed sequence program and signaling sequence in oem character set.
In one preferred embodiment, the equal length of the length of the fixed sequence program and the signaling sequence, and The length is less than the 1/2 of the predetermined length.Wherein, the predetermined length is 1024, but can also be according to being in practical application System demand and change.
By taking predetermined length is 1024 as an example, if the length of fixed sequence program is L (i.e. effective subcarrier of carrying fixed sequence program Number is L), the length of signaling sequence be P (i.e. the number of effective subcarrier of carrier signaling sequence is P), in the present embodiment, L=P.In other embodiments, L can also be slightly larger than P.
Between the fixed sequence program and signaling sequence in oem character set arrange, i.e., fixed sequence program fill to even subcarrier (or Odd subcarrier) on position, correspondingly, signaling sequence is filled to odd subcarrier (or even subcarrier) position, thus in frequency domain The distribution of fixed sequence program and the arrangement of signaling sequence oem character set is presented on effective subcarrier.It should be noted that when fixing When sequence and the inconsistent length of signaling sequence (such as P > L), fixation can be realized by way of zero padding sequence subcarrier Sequence and the arrangement of signaling sequence oem character set.
As described in step S14, null sequence subcarrier is filled respectively in effective subcarrier two sides to form predetermined length Frequency-domain OFDM symbol: where serial number of the selected signaling sequence in set is the signaling letter of OFDM symbol carrying Breath.
In one preferred embodiment, this step includes: to fill equal length respectively 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.
Further, in order to guarantee that receiving end can still be located within the scope of -500kHz to 500kHz in carrier frequency offset Reason receives signal, and the value of (1024-L-P)/2 is typically larger than critical length value (being set as TH), and the critical length value is by system symbol Rate and predetermined length determine.For example, system symbol rate of the predetermined length for 1024,7.61M, the sample rate of 9.14M, then For example, L=P=353, then G=318, two sides are respectively filled 159 null sequence subcarriers.
Therefore, subcarrier (i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024)0,P1_X1,…,P1_X1023By Following manner filling generates:
Wherein, fixed sequence program subcarrierSignaling sequence subcarrierLocating odd even position can be interchanged.
As shown in Fig. 2 in a kind of physical frame of the invention the specific embodiment of the generation method of leading symbol stream Journey schematic diagram.With reference to Fig. 2, the generation method of leading symbol includes the following steps: in physical frame
Step S21: inverse discrete fourier transform is made to obtain time-domain OFDM symbol to the frequency-domain OFDM symbol of predetermined length； Wherein, the frequency-domain OFDM symbol is to generate to obtain according to the generation method of above-mentioned frequency-domain OFDM symbol；
Step S22: the time-domain OFDM symbol of circulating prefix-length is intercepted as cyclic prefix from the time-domain OFDM symbol；
Step S23: the time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulated signal；
Step S24: leading symbol is generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal.
In the present embodiment, as described in step S21, inverse discrete fourier transform is made to the frequency-domain OFDM symbol of predetermined length To obtain time-domain OFDM symbol.
Inverse discrete fourier transform described in this step is that frequency-region signal is commonly converted into the mode of time-domain signal, It will not go into details for this.
P1_XiTime-domain OFDM symbol is obtained after making inverse discrete fourier transform:
Wherein, L is the number of fixed sequence program carrier wave, and P is the number of signaling sequence carrier wave, and R is fixed sequence program and signaling sequence Average power ratio.
As described in step S22, it is used as and follows from the time-domain OFDM symbol of time-domain OFDM symbol interception circulating prefix-length Ring prefix.
In the present embodiment, the circulating prefix-length is equal to or less than the predetermined length.With the predetermined length For 1024, the circulating prefix-length can be 1024 or less than 1024.Preferably, the circulating prefix-length is 520, the latter half (length 520) of the time-domain OFDM symbol is usually intercepted as cyclic prefix, to solve frequency domain letter Estimate the problem of performance decline in road.
Wherein, the determining circulating prefix-length be usually required according to wireless broadcast communication system confrontation multipath it is long Degree, system can obtain the minimum length of robust correlation peak and the bit of spatial structure transmission signaling in minimum threshold level Number is any one or more of because usually determining.If only needing to transmit signaling in frequency-domain structure, and spatial structure is fixed and nothing Signaling need to be transmitted, then only needs to consider to need the multipalh length fought, system that can obtain robust relevant peaks in minimum threshold level One of minimum length of value or two.In general, the length of cyclic prefix is longer, the performance for fighting long multipath is better, and The length and modulated signal length of cyclic prefix are longer, postpone relevant peak value and get over robust.In general, the length of cyclic prefix and Modulated signal length need to can obtain the minimum length of robust correlation peak more than or equal to system in minimum threshold level.
As described in step S23, the time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulation letter Number.In practice, modulated signal length is generally without departing from the length of cyclic prefix part.
Specifically, this step includes:
1) a frequency deviation sequence is set；
2) by the time domain OFDM of the time-domain OFDM symbol of the circulating prefix-length or the part circulating prefix-length Symbol is multiplied by the frequency deviation sequence to obtain the modulated signal.
For example, setting NcpFor determining circulating prefix-length, LenBFor modulated signal length.Modulated signal length is existed by system The minimum length of robust correlation peak can be obtained when minimum threshold level to determine.Usual modulated signal length is more than or equal to this most Small length.If NAFor the length of time-domain OFDM symbol, if sampled point serial number 0,1 ... the N of time-domain OFDM symbolA- 1. set N1 as Selection is copied to the sampled point serial number of the corresponding time-domain OFDM symbol of starting point of modulated signal section, and N2 is that selection is copied to modulation letter The corresponding time-domain OFDM symbol sampled point serial number of the terminal of number section.Wherein,
N2=N1+LenB-1
For ease of description, time-domain OFDM symbol is divided into 2 parts, first segment is the part not intercepted as cyclic prefix Time-domain OFDM symbol (the generally front of the time-domain OFDM symbol), second segment are part time domain of the interception as cyclic prefix OFDM symbol (the generally rear portion of the time-domain OFDM symbol).If interception time-domain OFDM symbol is all used as cyclic prefix, the One section of length is 0.N1 is centainly fallen in second segment, that is, is selected to the range of the part time-domain OFDM symbol of modulated signal section Range without departing from interception as the part time-domain OFDM symbol of cyclic prefix.
Modulated signal part, cyclic prefix part are identical as a part of information in time-domain OFDM symbol.Wherein, modulation letter Number part is only to have modulated frequency deviation or other signals, therefore can use the correlation of modulated signal part Yu cyclic prefix part And the correlation of modulated signal part and time-domain OFDM symbol does Timing Synchronization and small inclined estimation.In practice, modulation letter Number length is usually no more than circulating prefix-length.If modulated signal length is greater than circulating prefix-length, the part exceeded will increase The expense of adding system, causes the decline of efficiency of transmission, and it to be only capable of enhanced modulation signal section related to time-domain OFDM symbol The robustness of value, under the expense maintained like, this partial-length should increase to cyclic prefix part, it will bring more Performance benefits.
As shown in figure 3, A segment table shows that time-domain OFDM symbol, C segment table show that cyclic prefix, B segment table show modulated signal.The frequency deviation Sequence isWherein fSHIt can be chosen for the corresponding subcarrier in frequency domain interval (i.e. 1/ of time-domain OFDM symbol NAT), wherein T is sampling period, NAFor the length of time-domain OFDM symbol.In this example, NAIt is 1024, takes fSH=1/1024T. In other instances, in order to keep correlation peak sharp, fSHAlso it can choose as 1/ (LenBT).Work as LenB=NCPWhen, fSH=1/ NCPT.Such as LenB=NCPWhen=512, fSH=1/512T.
In other embodiments, M (t) can also be designed to other sequences, such as m-sequence or the window sequence of some simplification Deng.
The modulated signal of the part time-domain OFDM symbol is P1_B (t), and P1_B (t) is by the part time-domain OFDM symbol It is obtained multiplied by frequency deviation sequence M (t), i.e. P1_B (t) are as follows:
Wherein, N1 is that selection is copied to modulated signal section The corresponding time-domain OFDM symbol of starting point sampled point serial number.
As described in step S24, generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal leading Symbol.
Specifically, the cyclic prefix is spliced in the front of the time-domain OFDM symbol as protection interval, and by institute Modulated signal is stated to splice at the rear portion of the OFDM symbol as frequency modulation sequence to generate leading symbol, as shown in Figure 3.
For example, leading symbol can be according to using following time-domain expression:
In a preferred embodiment, the predetermined length NAWhen=1024, Ncp=520, LenB=504, N1 be 504 or 520。
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair Bright technical solution makes possible variation and modification, therefore, anything that does not depart from the technical scheme of the invention, and according to the present invention Technical spirit any simple modifications, equivalents, and modifications to the above embodiments, belong to technical solution of the present invention Protection scope.

Claims (7)

1. a kind of generation method of frequency-domain OFDM symbol, which comprises the steps of:
Determine the average power ratio R of fixed sequence program and signaling sequence；
Fixed sequence program and signaling sequence set are generated respectively on frequency domain according to average power ratio R；
A signaling sequence is selected from signaling sequence set, and fixed sequence program and the signaling sequence are filled to effective subcarrier On, and arranged between the fixed sequence program and signaling sequence in oem character set；
Fill null sequence subcarrier respectively in effective subcarrier two sides to form the frequency-domain OFDM symbol of predetermined length: its In, serial number of the selected signaling sequence in set is the signaling information of the OFDM symbol carrying,
Wherein, generating signaling sequence set includes:
It is arranged in order using whole signaling sequences in signaling sequence subclass together to form signaling sequence set,
Generating each signaling sequence subclass includes:
Determine that CAZAC sequence generates the root value in formula based on the number of the signaling sequence；
According to selected root value, a different set of q value is selected to generate CAZAC sequence,
Generate the parameter of each signaling sequence subclass are as follows:
1) the root value of first signaling sequence subclass is 353；
The value of q value is all numerical value in following table:
1 9 10 16 18 21 28 29 32 35 49 51 53 54 55 57 59 60 61 65 68 70 74 75 76 77 78 82 84 85 86 88 90 95 96 103 113 120 123 125 126 133 134 135 137 138 140 141 142 145 147 148 150 151 155 156 157 161 163 165 167 170 176 178 179 181 182 184 185 187 194 200 201 204 209 210 217 222 223 224 225 229 232 234 235 237 239 241 244 246 247 248 249 251 252 253 254 255 262 270 272 273 280 282 290 291 306 307 308 309 311 313 314 315 317 320 326 327 330 331 333 336 338 340 342 345 347 349
The digit of cyclic shift is all numerical value in following table:
105 244 172 249 280 251 293 234 178 11 63 217 83 111 282 57 85 134 190 190 99 180 38 191 22 254 186 308 178 251 277 261 44 271 265 298 328 282 155 284 303 113 315 299 166 342 133 115 225 13 26 326 148 195 145 185 121 58 162 118 151 182 230 39 249 305 309 144 188 181 265 140 212 137 10 298 122 281 181 267 178 187 177 352 4 353 269 38 342 288 277 88 124 120 162 204 174 294 166 157 56 334 110 183 131 171 166 321 96 37 261 155 34 149 156 267 332 93 348 300 245 101 186 117 329 352 215 55
2) the root value of second signaling sequence subclass is 367；
The value of q value is all numerical value in following table:
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80 119 120 121 123 140 142 151 154 162 166 171 184 186 188 190 191 193 194 195 198 203 204 207 208 209 210 211 212 214 215 219 220 221 222 223 224 226 228 230 232 233 235 236 237 239 240 241 243 245 249 250 252 254 257 259 260 261 262 263 264 265 266 267 269 271 272 273 275 276 277 278 281 282 283 284 285 286 289 294 297 299 302 303 306 307 310 311 312 313 314 316 317 321 322 323 326 327 329 331 332 334 338 340 342 344 345 347 349 351 356 361 363 366
The digit of cyclic shift is all numerical value in following table:
198 298 346 271 345 324 160 177 142 71 354 290 69 144 28 325 100 55 237 196 271 210 187 277 8 313 53 53 194 294 36 202 69 25 18 179 318 149 11 114 254 191 226 138 179 341 366 176 64 50 226 23 181 26 327 141 244 179 74 23 256 265 223 288 127 86 345 304 260 139 312 62 360 107 201 301 263 257 184 329 300 81 121 49 196 201 94 147 346 179 59 212 83 195 145 3 119 152 310 31 134 54 187 131 63 276 294 142 246 54 181 121 273 276 36 47 16 199 243 235 194 348 95 262 52 210 115 250
3) the root value of third signaling sequence subclass is 359；
The value of q value is all numerical value in following table:
1 3 5 6 9 12 14 22 29 30 32 34 60 63 65 67 72 74 76 78 83 84 87 88 89 90 91 92 94 95 96 99 112 115 123 124 128 137 141 143 145 149 152 153 154 155 159 164 165 169 175 179 183 186 187 188 189 192 197 199 201 202 203 211 215 219 220 221 223 226 227 228 229 230 234 237 238 239 243 246 248 249 250 252 254 257 258 261 262 273 274 280 282 284 286 288 290 297 298 300 303 308 309 310 312 313 314 317 318 319 320 321 322 323 324 326 333 334 335 336 339 341 342 344 349 351 352 355
The digit of cyclic shift is all numerical value in following table:
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20 18 226 165 320 339 352 316 241 336 119 166 258 273 302 275 46 26 259 330 206 46 10 308 165 195 314 330 208 148 275 15 214 251 8 27 264 169 128 207 21 246 14 291 345 114 306 179 109 336 322 149 270 253 207 152 26 190 128 137 196 268 36 40 253 29 264 153 221 341 116 24 55 60 171 25 100 202 37 93 115 174 239 148 170 37 328 37 253 237 355 39 288 225 223 140 163 145 264 75 29 282 252 270 30 262 271 305 122 78 27 127 92 6
4) the root value of the 4th signaling sequence subclass is 373；
The value of q value is all numerical value in following table:
26 28 29 34 38 40 43 49 54 57 58 62 64 65 79 80 81 83 85 86 87 101 102 187 189 190 191 193 194 195 196 198 199 200 202 204 205 206 208 209 211 213 214 216 217 218 219 220 221 222 223 224 225 227 228 230 232 233 236 237 241 243 245 246 247 248 249 250 251 252 253 255 256 259 260 261 262 263 265 266 267 275 276 280 282 283 284 285 289 295 297 300 301 302 303 305 307 317 320 322 323 325 327 328 332 338 341 342 343 348 349 351 352 353 355 356 357 358 359 360 361 362 363 364 367 369 370 372
The digit of cyclic shift is all numerical value in following table:
333 337 177 125 169 270 254 88 123 310 96 273 120 239 157 224 62 119 19 235 136 117 237 100 244 181 295 249 356 9 289 139 82 171 178 292 158 308 257 42 55 210 320 294 100 75 79 163 195 80 303 97 271 179 359 178 241 281 367 58
91 7 179 39 267 245 213 286 349 172 35 301 361 102 301 155 1 34 96 293 202 87 176 248 319 301 168 280 154 244 215 370 260 117 30 329 42 149 112 125 50 249 197 273 230 13 142 244 335 57 21 261 48 370 110 296 326 224 77 112 31 262 121 38 283 323 93 94
。
2. the generation method of frequency-domain OFDM symbol as described in claim 1, which is characterized in that generate fixed sequence program on frequency domain Include the following steps:
Determine the length of fixed sequence program；Wherein, it is definite value that each of described fixed sequence program element, which is mould, and argument is 0 to 2 The plural number of arbitrary value between π；
A fixed sequence program is selected from all optional fixed sequence programs, and is generated with good autocorrelation and cross correlation Signaling sequence set, and existed based on OFDM symbol composed by any signaling sequence in the fixed sequence program and signaling sequence set Meet required power PAR after inverse fourier transform.
3. the generation method of frequency-domain OFDM symbol as described in claim 1, which is characterized in that generate signaling sequence on frequency domain Set includes:
Determine the number of contained signaling sequence in the length and signaling sequence set of signaling sequence；Wherein, the signaling sequence Number is 2 n times power, and N is positive integer；
M signaling sequence subclass is generated respectively, and the number of the signaling sequence in each signaling sequence subclass is respectively m1~ mM, and
Whole signaling sequences in each signaling sequence subclass are arranged in order together to form signaling sequence set；
Wherein, the root value of each signaling sequence subclass is different, and the amplitude of each element is in all signaling sequences Element amplitude in fixed sequence program
4. the generation method of frequency-domain OFDM symbol as claimed in claim 3, which is characterized in that generate each signaling sequence Set includes:
Determine that CAZAC sequence generates the root value in formula based on the number of the signaling sequence；Wherein root value be greater than or Equal to twice of the number of signaling sequence；
According to selected root value, a different set of q value is selected to generate CAZAC sequence, wherein the number of q value is equal to signaling sequence The number of column, the value of q value is integer and is greater than 0 less than root value, and the sum of any two q value is not equal to root value；
Cyclic shift is carried out to generated CAZAC sequence；Wherein, the digit of cyclic shift is determined by corresponding root value and q value It is fixed；
Required signaling sequence subset is calculated according to the digit of the number of identified signaling sequence, q value and cyclic shift It closes.
5. the generation method of frequency-domain OFDM symbol as described in claim 1, which is characterized in that the fixed sequence program and signaling sequence The average power ratio R of column is 1.
6. the generation method of frequency-domain OFDM symbol as claimed in claim 2, which is characterized in that the fixed sequence program length is 353, mould 1, expression formula are as follows:
FC (n)=ejωn
Wherein, ωnValue it is as shown in the table by rows from left to right in order:
5.43 2.56 0.71 0.06 2.72 0.77 1.49 6.06 4.82 2.10 5.62 4.96 4.93 4.84 4.67 5.86 5.74 3.54 2.50 3.75 0.86 1.44 3.83 4.08 5.83 1.47 0.77 1.29 0.16 1.38 4.38 2.52 3.42 3.46 4.39 0.61 4.02 1.26 2.93 3.84 3.81 6.21 3.80 0.69 5.80 4.28 1.73 3.34 3.08 5.85 1.39 0.25 1.28 5.14 5.54 2.38 6.20 3.05 4.37 5.41 2.23 0.49 5.12 6.26 3.00 2.60 3.89 5.47 4.83 4.17 3.36 2.63 3.94 5.13 3.71 5.89 0.94 1.38 1.88 0.13 0.27 4.90 4.89 5.50 3.02 1.94 2.93 6.12 5.47 6.04 1.14 5.52 2.01 1.08 2.79 0.74 2.30 0.85 0.58 2.25 5.25 0.23 6.01 2.66 2.48 2.79 4.06 1.09 2.48 2.39 5.39 0.61 6.25 2.62 5.36 3.10 1.56 0.91 0.08 2.52 5.53 3.62 2.90 5.64 3.18 2.36 2.08 6.00 2.69 1.35 5.39 3.54 2.01 4.88 3.08 0.76 2.13 3.26 2.28 1.32 5.00 3.74 1.82 5.78 2.28 2.44 4.57 1.48 2.48 1.52 2.70 5.61 3.06 1.07 4.54 4.10 0.09 2.11 0.10 3.18 3.42 2.10 3.50 4.65 2.18 1.77 4.72 5.71 1.48 2.50 4.89 4.04 6.12 4.28 1.08 2.90 0.24 4.02 1.29 3.61 4.36 6.00 2.45 5.49 1.02 0.85 5.58 2.43 0.83 0.65 1.95 0.79 5.45 1.94 0.31 0.12 3.25 3.75 2.35 0.73 0.20 6.05 2.98 4.70 0.69 5.97 0.92 2.65 4.17 5.71 1.54 2.84 0.98 1.47 6.18 4.52 4.44 0.44 1.62 6.09 5.86 2.74 3.27 3.28 0.55 5.46 0.24 5.12 3.09 4.66 4.78 0.39 1.63 1.20 5.26 0.92 5.98 0.78 1.79 0.75 4.45 1.41 2.56 2.55 1.79 2.54 5.88 1.52 5.04 1.53 5.53 5.93 5.36 5.17 0.99 2.07 3.57 3.67 2.61 1.72
2.83 0.86 3.16 0.55 5.99 2.06 1.90 0.60 0.05 4.01 6.15 0.10 0.26 2.89 3.12 3.14 0.11 0.11 3.97 5.15 4.38 2.08 1.27 1.17 0.42 3.47 3.86 2.17 5.07 5.33 2.63 3.20 3.39 3.21 4.58 4.66 2.69 4.67 2.35 2.44 0.46 4.26 3.63 2.62 3.35 0.84 3.89 4.17 1.77 1.47 2.03 0.88 1.93 0.80 3.94 4.70 6.12 4.27 0.31 4.85 0.27 0.51 2.70 1.69 2.18 1.95 0.02 1.91 3.13 2.27 5.39 5.45 5.45 1.39 2.85 1.41 0.36 4.34 2.44 1.60 5.70 2.60 3.41 1.84 5.79 0.69 2.59 1.14 5.28 3.72 5.55 4.92 2.64
。
7. the generation method of frequency-domain OFDM symbol as claimed in claim 3, which is characterized in that signaling sequence set generated The number of middle signaling sequence is 512, and the signaling sequence set includes 4 signaling sequence subclass, each signaling sequence subset The signaling sequence number that conjunction includes is 128, and the length of signaling sequence is 353.
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