CN105282076A - Generation method of preamble symbols and generation method of frequency-domain OFDM symbols - Google Patents

Generation method of preamble symbols and generation method of frequency-domain OFDM symbols Download PDF

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Publication number
CN105282076A
CN105282076A CN201410259080.2A CN201410259080A CN105282076A CN 105282076 A CN105282076 A CN 105282076A CN 201410259080 A CN201410259080 A CN 201410259080A CN 105282076 A CN105282076 A CN 105282076A
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Prior art keywords
signaling sequence
sequence
value
signaling
ofdm symbol
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CN201410259080.2A
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CN105282076B (en
Inventor
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 for Nanotechnology Co Ltd
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 Critical patent/CN105282076B/en
Priority to CN201611106875.5A priority patent/CN106850485A/en
Priority to CN201611107017.2A priority patent/CN106850486A/en
Priority to CN201611199976.1A priority patent/CN106998312B/en
Priority to PCT/CN2015/076815 priority patent/WO2015158296A1/en
Priority to CA2945855A priority patent/CA2945855A1/en
Priority to US15/304,854 priority patent/US10778484B2/en
Priority to KR1020167032043A priority patent/KR101974621B1/en
Priority to PCT/CN2015/076813 priority patent/WO2015158294A1/en
Priority to US15/304,851 priority patent/US11071072B2/en
Priority to CA3211647A priority patent/CA3211647A1/en
Priority to KR1020197038044A priority patent/KR102196222B1/en
Priority to KR1020207036622A priority patent/KR102347011B1/en
Priority to CA3212005A priority patent/CA3212005A1/en
Priority to CA2945858A priority patent/CA2945858C/en
Priority to PCT/CN2015/076812 priority patent/WO2015158293A1/en
Priority to CA2945856A priority patent/CA2945856C/en
Priority to KR1020167032059A priority patent/KR102062221B1/en
Priority to KR1020167032055A priority patent/KR102048221B1/en
Priority to US15/304,856 priority patent/US10574494B2/en
Priority to CA2945854A priority patent/CA2945854A1/en
Priority to KR1020197033488A priority patent/KR102191859B1/en
Priority to KR1020207014009A priority patent/KR102223654B1/en
Priority to KR1020197018441A priority patent/KR102114352B1/en
Priority to PCT/CN2015/076808 priority patent/WO2015158292A1/en
Priority to US15/304,853 priority patent/US10411929B2/en
Priority to KR1020167032058A priority patent/KR102033742B1/en
Priority to US15/304,857 priority patent/US10148476B2/en
Priority to CA2945857A priority patent/CA2945857C/en
Priority to KR1020207035510A priority patent/KR102234307B1/en
Priority to KR1020167032057A priority patent/KR101975551B1/en
Priority to PCT/CN2015/076814 priority patent/WO2015158295A1/en
Priority to KR1020197012400A priority patent/KR102108291B1/en
Publication of CN105282076A publication Critical patent/CN105282076A/en
Priority to US16/172,662 priority patent/US11201770B2/en
Priority to US16/172,727 priority patent/US11025465B2/en
Application granted granted Critical
Publication of CN105282076B publication Critical patent/CN105282076B/en
Priority to US16/726,928 priority patent/US10958494B2/en
Priority to US16/726,927 priority patent/US11012275B2/en
Priority to US16/992,040 priority patent/US11128504B2/en
Priority to US16/992,039 priority patent/US11082274B2/en
Priority to US16/992,041 priority patent/US11088885B2/en
Priority to US16/992,038 priority patent/US11088884B2/en
Priority to US17/351,197 priority patent/US11799706B2/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 a generation method of frequency-domain OFDM symbols and a generation method of preamble symbols in physical frames. The generation method of the frequency-domain OFDM symbols includes the following steps that: the average power ratio of a fixed sequence and a signaling sequence is determined; fixed sequences and a signaling sequence set are respectively generated in the frequency domain according to the average power ratio R; one signaling sequence is selected from the signaling sequence set, and the fixed sequences and the signaling sequences fill effective sub carriers, odd-even staggered arrangement exists between the fixed sequences and the signaling sequences; two sides of the effective sub carriers are filled with zero-sequence sub carriers respectively to form a frequency domain OFDM symbol with a preset length; and the serial number of the selected signaling sequence in the set is the signaling information carried by OFDM symbols. With the generation methods provided by the technical scheme of the invention adopted, the problem of failure probability in low-complexity receiving algorithm detection on preamble symbols in a frequency selective fading channel in the current DVB_T2 standard and other standards can be solved.

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, particularly a kind of generation method of leading symbol in generation method of frequency-domain OFDM symbol and physical frame.
Background technology
Generally for the data making the receiving terminal of ofdm system correctly can demodulate transmitting terminal to send, ofdm system must to realize between transmitting terminal and receiving terminal time synchronized accurately and reliably.Meanwhile, because ofdm system is very responsive to the frequency deviation of carrier wave, the receiving terminal of ofdm system also needs the carrier spectrum method of estimation providing precise and high efficiency, to estimate accurately carrier wave frequency deviation and to correct.
At present, transmitting terminal is realized in ofdm system and the synchronous method of destination time realizes based on leading symbol substantially.Leading symbol is the symbol sebolic addressing that the transmitting terminal of ofdm system and receiving terminal are all known, leading symbol is as the beginning (called after P1 symbol) of physical frame, in each physical frame, only occur a P1 symbol or occur multiple P1 symbol continuously, it has indicated the beginning of this physical frame.The purposes of P1 symbol includes:
1) whether what make receiving terminal detect rapidly to determine to transmit in channel is the signal expecting to receive;
2) basic transformation parameter (such as FFT counts, frame type information etc.) is provided, receipt of subsequent process can be carried out to make receiving terminal;
3) detect original carrier frequency deviation and timing error, after compensating, reach frequency and Timing Synchronization;
4) emergency alarm or broadcast system wake up.
Propose the P1 Design of Symbols based on CAB spatial structure in DVB_T2 standard, achieve above-mentioned functions preferably.But, low complex degree receiving algorithm still has some limit to.Such as, when the long multipath channel of 1024,542 or 482 symbols, utilizing CAB structure to carry out timing coarse synchronization can there is relatively large deviation, causes frequency domain being estimated mistake appears in carrier wave integer frequency offset.In addition, when complex frequency Selective Fading Channel, such as, during long multipath, DBPSK differential decoding also may lose efficacy.And, owing to there is no Cyclic Prefix in DVB_T2 spatial structure, and if need to carry out the frequency-domain structure combination of channel estimating, will the problem of its channel estimation in frequency domain performance degradation be caused.
Summary of the invention
The problem that the present invention solves is in current DVB_T2 standard and other standards, Cyclic Prefix is not had in DVB_T2 spatial structure, can not be applicable to relevant detection, and leading symbol low complex degree receiving algorithm under complex frequency Selective Fading Channel detects the problem occurring probability of failure.
For solving the problem, embodiments providing a kind of generation method of frequency-domain OFDM symbol, comprising the steps: the average power ratio R determining fixed sequence program and signaling sequence; On frequency domain, fixed sequence program and signaling sequence set is generated respectively according to this average power ratio; From signaling sequence set, select a signaling sequence, fixed sequence program and this signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence; Null sequence subcarrier is filled respectively to form the frequency-domain OFDM symbol of predetermined length in described effective subcarrier both sides; Wherein, the sequence number of selected signaling sequence in set is the signaling information of this OFDM symbol carrying.
The embodiment of the present invention additionally provides the generation method of leading symbol in a kind of physical frame, comprises the steps: to change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to the frequency-domain OFDM symbol of predetermined length; Wherein, described frequency-domain OFDM symbol obtains according to the generation method of above-mentioned frequency-domain OFDM symbol; The time-domain OFDM symbol of circulating prefix-length is intercepted as Cyclic Prefix from described time-domain OFDM symbol; Time-domain OFDM symbol based on the described circulating prefix-length of above-mentioned intercepting generates modulation signal; Leading symbol is generated based on described Cyclic Prefix, described time-domain OFDM symbol and described modulation signal.
Compared with prior art, technical solution of the present invention has following beneficial effect:
According to the generation method of the frequency-domain OFDM symbol that the embodiment of the present invention provides, fixed sequence program and signaling sequence are filled on effective subcarrier in the mode of oem character set, by so specific frequency-domain structure design, wherein fixed sequence program can as the pilot tone in physical frame, thus is convenient to receiving terminal and carries out decoding demodulation to leading symbol in the physical frame received.
Further, frequency domain generates in the method for fixed sequence program, in fixed sequence program, each element is mould is definite value, and argument is the plural number of arbitrary value between 0 to 2 π.Frequency domain generate in the method for signaling sequence set, the number of signaling sequence is the integral number power of 2, and determine that CAZAC sequence generates the root value in formula based on the length of signaling sequence and number, determine the figure place k of a different set of q value and corresponding cyclic shift, and calculate signaling sequence thus.
And inventor obtains an effect in practice and preferably fixes signaling, the one group of effect preferably length of signaling sequence and figure place of number and corresponding four root values and each root value interior selection 128 groups of q values and cyclic shift.Thus make the leading symbol of follow-up generation have lower papr (PeaktoAveragePowerRatio, PAPR), and improve the probability of success that receiving terminal detects leading symbol.
Further, utilize the modulation signal of time-domain OFDM symbol and the structure (as leading symbol) of time-domain OFDM symbol ensure that and to utilize at receiving terminal and postpone relevantly can obtain obvious peak value.And; in this leading symbol process of generation; the modulation signal of design time-domain OFDM symbol can avoid receiving terminal to be subject to continuous wave CO_2 laser or mono-tone interference; or occur and the isometric multipath channel of modulation signal length, or occur error detection peak value when protecting gap length identical with modulation signal length in Received signal strength.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the generation method of a kind of frequency-domain OFDM symbol of the present invention;
Fig. 2 is the schematic flow sheet of the embodiment of the generation method of leading symbol in a kind of physical frame of the present invention;
Fig. 3 is the spatial structure schematic diagram of leading symbol in a kind of physical frame of the present invention.
Embodiment
Inventor finds in current DVB_T2 standard and other standards, and leading symbol low complex degree receiving algorithm under frequency selective fading channels detects the problem occurring probability of failure.In addition, in DVB_T2 spatial structure, there is no Cyclic Prefix, relevant detection can not be applicable to, and leading symbol low complex degree receiving algorithm under frequency selective fading channels detects the problem occurring probability of failure.
For the problems referred to above, inventor, through research, provides the generation method of leading symbol in a kind of physical frame and the generation method of frequency-domain OFDM symbol, ensures that carrier frequency offset receiving terminal within the scope of-500kHz to 500kHz still can process Received signal strength.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
As shown in Figure 1 be the schematic flow sheet of the embodiment of the generation method of a kind of frequency-domain OFDM symbol of the present invention.With reference to figure 1, the generation method of frequency-domain OFDM symbol comprises the steps:
Step S11: the average power ratio R determining fixed sequence program and signaling sequence;
Step S12: generate fixed sequence program and signaling sequence set respectively according to this average power ratio R on frequency domain;
Step S13: select a signaling sequence from signaling sequence set, is filled to fixed sequence program and this signaling sequence on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence;
Step S14: fill null sequence subcarrier respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length; Wherein, the sequence number of selected signaling sequence in set is the signaling information of described OFDM symbol carrying.
Specifically, as described in step S11, determine the average power ratio R of fixed sequence program and signaling sequence.Wherein, described fixed sequence program comprise receiving terminal can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, described signaling sequence set in sequence for carrying each basic transformation parameter.
Wherein, the average power ratio R of fixed sequence program and signaling sequence can adjust according to practical application request, select larger R to obtain better channel estimating and whole inclined estimated performance with the power increasing fixed sequence program, or select less R improve the actual signal to noise ratio on signaling carrier with the power increasing signaling sequence thus improve signaling decoding performance.Therefore, the average power ratio R of fixed sequence program and signaling sequence considers according to the equilibrium of whole inclined estimated performance, channel estimating performance, solution signaling performance and Timing Synchronization performance and determines.
In the present embodiment, the average power ratio R of described fixed sequence program and signaling sequence is 1.When fixed sequence program length is identical with signaling sequence length, average power ratio is the ratio of power summation.
After determining average power ratio, the just corresponding Amplitude Ration being fixed sequence and signaling sequence.When average power ratio R 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, on frequency domain, generate fixed sequence program and signaling sequence set respectively according to this average power ratio R.
In the present embodiment, frequency domain generating fixed sequence program can adopt following concrete mode to realize:
Step S121: the length determining fixed sequence program; Wherein, each element in described fixed sequence program is mould is definite value, and argument is the plural number of arbitrary value between 0 to 2 π.
It should be noted that, in the present embodiment, the length of described fixed sequence program is less than the half of OFDM symbol length.
Step S122: select a fixed sequence program from all optional fixed sequence programs, and generate the signaling sequence set with good autocorrelation and cross correlation, and after inverse fourier transform, meeting required power PAR based on the OFDM symbol that arbitrary signaling sequence in this fixed sequence program and signaling sequence set forms.
Particularly, in all valued space (namely each element is mould is definite value, and argument is the plural number of arbitrary value between 0 to 2 π) of above-mentioned fixed sequence program, a fixed sequence program is optimized.This fixed sequence program demand fulfillment selected: the signaling sequence set generated by this fixed sequence program has good autocorrelation and cross correlation, and based on the frequency-domain OFDM symbol that the arbitrary signaling sequence in this fixed sequence program and signaling sequence set forms, there is after inverse fourier transform lower power PAR (Peak-to-AveragePowerRatio, and the concrete numerical value (or number range) of this power PAR can be determined according to system requirements PAPR).
In the present embodiment, frequency domain generating signaling sequence set can adopt following concrete mode to realize:
Step S123: the number determining contained signaling sequence in the length of signaling sequence and signaling sequence set; Wherein, the number of described signaling sequence is the N power of 2, and N is positive integer;
Step S124: generate M signaling sequence subclass respectively, and the number of signaling sequence in each signaling sequence subclass is respectively m 1~ m m, and
Step S125: the whole signaling sequences in each signaling sequence subclass are arranged together to form signaling sequence set in order; And be numbered 0 ~ 2 n-1;
Wherein, the root value of each signaling sequence subclass is different, and in all signaling sequences, the amplitude of each element is element amplitude in fixed sequence program
Further, the present embodiment gives in above-mentioned steps S124 the preferred implementation generating each signaling sequence subclass, specific as follows:
Step S1241: the number based on described signaling sequence determines that CAZAC sequence generates the root value in formula; Wherein root value is greater than or equal to the twice of the number of signaling sequence.
In practice, root is prime number, and preferred root=L, the autocorrelation value of such sequence is zero.
Step S1242: according to selected root value, select a different set of q value to produce CAZAC sequence, wherein the number of q value equals the number of signaling sequence, and the value of q value is integer and is greater than 0 to be less than root value, and any two q value sums are not equal to root value;
Step S1243: cyclic shift is carried out to produced CAZAC sequence; Wherein, the figure place of cyclic shift is determined by corresponding root value and q value.
In actual applications, the figure place of q value and cyclic shift is selected to make having low cross correlation between all signaling sequences, and the frequency-domain OFDM symbol formed has low power PAR (Peak-to-AveragePowerRatio, PAPR) after inverse fourier transform.
Step S1244: the figure place according to the number of determined signaling sequence, q value and cyclic shift calculates required signaling sequence subclass.
Such as, determine fixed sequence program and signaling sequence length L, root value, and the preferred figure place (q of one group of q value and one group of cyclic shift i, k i, i=0 ~ 2 n-1), the generation formula method of i-th signaling sequence:
First, CAZAC sequence is generated:
s i ( n ) = 1 R exp ( - jπ q i n ( n + 1 ) / root ) , n = 0 ~ root - 1
Then, cyclic shift is carried out to it:
s i *(n)＝[s(k i-1),s(k i),...,S(root-1),s(0),...,s(k i-1)]
Finally, from the head of above-mentioned sequence, intercepted length is the sequence of L:
SC i(n)＝s i *(n),n＝0～L-1
The sequence SC obtained in () is i-th required signaling sequence.
For example, determine that average power ratio R is 1; Fixed sequence program length is 353, and amplitude is 1, one that calculates preferably fixed sequence program, as shown in the formula expression:
FC ( n ) = e jω n
Wherein, ω nvalue 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
Determine that the number of signaling sequence is 512, and this signaling sequence set comprises 4 signaling sequence subclass, each signaling sequence subclass all comprises 128 signaling sequences, and the length of signaling sequence is 353.
According to above-mentioned fixed sequence program, calculate signaling sequence parameter used in each signaling sequence subclass as follows respectively:
1) the root value of first signaling sequence subclass is 353;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
2) the root value of second signaling sequence subclass is 367;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
3) the root value of the 3rd signaling sequence subclass is 359;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
4) the root value of the 4th signaling sequence subclass is 373;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
As described in step S13, from signaling sequence set, select a signaling sequence, fixed sequence program and this signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence.
In one preferred embodiment, the length of described fixed sequence program is equal with the length of described signaling sequence, and this length is less than 1/2 of described predetermined length.Wherein, described predetermined length is 1024, but also can change according to system requirements in practical application.
For predetermined length for 1024, if the length of fixed sequence program is L (number namely carrying effective subcarrier of fixed sequence program is L), the length of signaling sequence is P (namely the number of effective subcarrier of carrier signaling sequence is P), in the present embodiment, L=P.In other embodiments, L also can slightly larger than P.
The arrangement in oem character set between described fixed sequence program and signaling sequence, namely fixed sequence program is filled on even subcarrier (or strange subcarrier) position, correspondingly, signaling sequence is filled on strange subcarrier (or even subcarrier) position, thus on effective subcarrier of frequency domain, present the distribution of fixed sequence program and the arrangement of signaling sequence oem character set.It should be noted that, when the length of fixed sequence program and signaling sequence is inconsistent (such as P>L), fixed sequence program and the arrangement of signaling sequence oem character set can be realized by the mode of zero padding sequence subcarrier.
As described in step S14, fill null sequence subcarrier respectively to form the frequency-domain OFDM symbol of predetermined length: wherein in described effective subcarrier both sides, the sequence number of selected signaling sequence in set is the signaling information of described OFDM symbol carrying.
In one preferred embodiment, this step comprises: fill the null sequence subcarrier of equal length respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length.
Along the G=1024-L-P in order to predetermined length being the example of 1024, the length of null sequence subcarrier, (1024-L-P)/2 null sequence subcarrier is filled in both sides.
Further, in order to ensure still can to process Received signal strength at carrier frequency offset receiving terminal within the scope of-500kHz to 500kHz, (1024-L-P) value of/2 is greater than critical length value (being set to TH) usually, and this critical length value is determined by system symbol rate and predetermined length.Such as, predetermined length is the system symbol rate of 1024,7.61M, the sample rate of 9.14M, then such as, L=P=353, then G=318,159 null sequence subcarriers are respectively filled in both sides.
Therefore, subcarrier (the i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024) 0, P1_X 1..., P1_X 1023generate by filling with under type:
P 1 _ X i = 0 i = 0,1 , . . . , G / 2 - 1 FC ‾ i - G / 2 2 i = G / 2 , G / 2 + 2 , . . . G / 2 + 2 × ( N - 1 ) SC ‾ i - G / 2 - 1 2 i = G / 2 + 1 , G / 2 + 3 , G / 2 + 2 ( M - 1 ) + 1 0 i = 1024 - G / 2 , . . . 1023
Wherein, fixed sequence program subcarrier signaling sequence subcarrier residing odd even position can exchange.
As shown in Figure 2 be the schematic flow sheet of the embodiment of the generation method of leading symbol in a kind of physical frame of the present invention.With reference to figure 2, in physical frame, the generation method of leading symbol comprises the steps:
Step S21: change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to the frequency-domain OFDM symbol of predetermined length; Wherein, described frequency-domain OFDM symbol generates according to the generation method of above-mentioned frequency-domain OFDM symbol to obtain;
Step S22: intercept the time-domain OFDM symbol of circulating prefix-length as Cyclic Prefix from described time-domain OFDM symbol;
Step S23: the time-domain OFDM symbol based on the described circulating prefix-length of above-mentioned intercepting generates modulation signal;
Step S24: generate leading symbol based on described Cyclic Prefix, described time-domain OFDM symbol and described modulation signal.
In the present embodiment, as described in step S21, change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to the frequency-domain OFDM symbol of predetermined length.
It is conventional mode frequency-region signal being converted to time-domain signal that inverse discrete Fourier transform described in this step changes, and does not repeat them here.
P1_X itime-domain OFDM symbol is obtained after changing as inverse discrete Fourier transform:
P 1 _ A ( t ) = 1 L + P / R Σ i = 0 1023 P 1 _ X i e j 2 π ( i - 512 ) 1024 T t , Wherein, L is the number of fixed sequence program carrier wave, and P is the number of signaling sequence carrier wave, and R is the average power ratio of fixed sequence program and signaling sequence.
As described in step S22, intercept the time-domain OFDM symbol of circulating prefix-length as Cyclic Prefix from described time-domain OFDM symbol.
In the present embodiment, described circulating prefix-length is equal to or less than described predetermined length.For described predetermined length for 1024, described circulating prefix-length can be 1024 or be less than 1024.Preferably, described circulating prefix-length is 520, usually intercepts the latter half (length is 520) of this time-domain OFDM symbol as Cyclic Prefix, thus solves the problem of channel estimation in frequency domain hydraulic performance decline.
Wherein, describedly determine that circulating prefix-length is that multipalh length, the system usually needing to resist according to wireless broadcast communication system can obtain any one or more in the minimum length of robust correlation peak and the bit number of spatial structure command transmitting when minimum threshold level because usually determining.If only needed at frequency-domain structure command transmitting, and spatial structure is fixed and without the need to command transmitting, then only need to consider to need the multipalh length of antagonism, system can obtain robust correlation peak minimum length when minimum threshold level one of them or two.Usually, the length of Cyclic Prefix is longer, and the performance resisting long multipath is better, and the length of Cyclic Prefix and modulation signal length longer, it postpones relevant peak value and gets over robust.Usually, the length of Cyclic Prefix and modulation signal length need be more than or equal to system can obtain robust correlation peak minimum length when minimum threshold level.
As described in step S23, the time-domain OFDM symbol based on the described circulating prefix-length of above-mentioned intercepting generates modulation signal.In practice, modulation signal length does not generally exceed the length of Cyclic Prefix part.
Particularly, this step comprises:
1) a frequency deviation sequence is set;
2) time-domain OFDM symbol of the time-domain OFDM symbol of described circulating prefix-length or the described circulating prefix-length of part is multiplied by described frequency deviation sequence to obtain described modulation signal.
Such as, if N cpfor the circulating prefix-length determined, Len bfor modulation signal length.The minimum length that modulation signal length can obtain robust correlation peak when minimum threshold level by system is determined.Usual modulation signal length is more than or equal to this minimum length.If N afor the length of time-domain OFDM symbol, if the sampled point sequence number of time-domain OFDM symbol is 0,1 ... N a-1. set N1 as selecting to be copied to the sampled point sequence number of time-domain OFDM symbol corresponding to the starting point of modulation signal section, and N2 is the time-domain OFDM symbol sampled point sequence number that the terminal selecting to be copied to modulation signal section is corresponding.Wherein,
N2＝N1+Len B-1
For convenience of description, time-domain OFDM symbol is divided into 2 parts, first paragraph does not intercept the part time-domain OFDM symbol (being generally the front portion of this time-domain OFDM symbol) as Cyclic Prefix, and second segment intercepts the part time-domain OFDM symbol (being generally the rear portion of this time-domain OFDM symbol) as Cyclic Prefix.If intercept time-domain OFDM symbol all as Cyclic Prefix, then the length of first paragraph is 0.N1 necessarily drops in second segment, namely selects can not exceed the scope intercepted as the part time-domain OFDM symbol of Cyclic Prefix to the scope of the part time-domain OFDM symbol of modulation signal section.
Modulation signal part, Cyclic Prefix part are identical with a part of information in time-domain OFDM symbol.Wherein, modulation signal part is only modulated frequency deviation or other signals, and the correlation of the correlation of modulation signal part and Cyclic Prefix part and modulation signal part and time-domain OFDM symbol therefore can be utilized to do Timing Synchronization and little inclined estimation.In practice, modulation signal length is generally no more than circulating prefix-length.If modulation signal length is greater than circulating prefix-length, the part then exceeded will increase the expense of system, cause the decline of efficiency of transmission, and it only can the robustness of correlation of enhanced modulation signal section and time-domain OFDM symbol, under the expense that maintenance is same, this part length should be increased to Cyclic Prefix part, and it will bring more performance benefits.
As shown in Figure 3, A segment table shows time-domain OFDM symbol, and C segment table shows Cyclic Prefix, and B segment table shows modulation signal.This frequency deviation sequence is wherein f sHsubcarrier in frequency domain interval (the i.e. 1/N that time-domain OFDM symbol is corresponding can be chosen for at), wherein T is the sampling period, N afor the length of time-domain OFDM symbol.In this example, N abe 1024, get f sH=1/1024T.In other instances, in order to make correlation peak sharp-pointed, f sHalso 1/ (Len can be chosen as bt).Work as Len b=N cPtime, f sH=1/N cPt.Such as Len b=N cPwhen=512, f sH=1/512T.
In other embodiments, M (t) also can be designed to other sequences, as m sequence or some simplify window sequence etc.
The modulation signal of this part time-domain OFDM symbol is P1_B (t), P1_B (t) is be multiplied by frequency deviation sequence M (t) by this part time-domain OFDM symbol to obtain, and namely P1_B (t) is:
P 1 _ A ( t - ( N cp + N A - N 1 ) T ) e j 2 π f SH t , Wherein, N1 is the sampled point sequence number selecting to be copied to time-domain OFDM symbol corresponding to the starting point of modulation signal section.
As described in step S24, generate leading symbol based on described Cyclic Prefix, described time-domain OFDM symbol and described modulation signal.
Particularly, using the splicing of described Cyclic Prefix in the front portion of described time-domain OFDM symbol as protection interval, and using described modulation signal splicing at the rear portion of described OFDM symbol as frequency modulation sequence to generate leading symbol, as shown in Figure 3.
Such as, leading symbol can according to employing following time-domain expression:
P 1 ( t ) = P 1 _ A ( t + ( N A - N cp ) T ) 0 &le; t < N cp T P 1 _ A ( t - N cp T ) N cp T &le; t < ( N A + N cp ) T P 1 _ A ( t - ( N cp + N A - N 1 ) T ) e j 2 &pi; f SH t ( N A + N cp ) T &le; t < ( N A + N cp + Len B ) T 0 otherwise
In a preferred embodiment, described predetermined length N awhen=1024, N cp=520, Len b=504, N1 is 504 or 520.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.

Claims (10)

1. a generation method for frequency-domain OFDM symbol, is characterized in that, comprise the steps:
Determine the average power ratio R of fixed sequence program and signaling sequence;
On frequency domain, fixed sequence program and signaling sequence set is generated respectively according to this average power ratio R;
From signaling sequence set, select a signaling sequence, fixed sequence program and this signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence;
Fill null sequence subcarrier respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length: wherein, the sequence number of selected signaling sequence in set is the signaling information of described OFDM symbol carrying.
2. the generation method of frequency-domain OFDM symbol as claimed in claim 1, is characterized in that, frequency domain generates fixed sequence program and comprises the steps:
Determine the length of fixed sequence program; Wherein, each element in described fixed sequence program is mould is definite value, and argument is the plural number of arbitrary value between 0 to 2 π;
A fixed sequence program is selected from all optional fixed sequence programs, and generate the signaling sequence set with good autocorrelation and cross correlation, and after inverse fourier transform, meeting required power PAR based on the OFDM symbol that arbitrary signaling sequence in this fixed sequence program and signaling sequence set forms.
3. the generation method of frequency-domain OFDM symbol as claimed in claim 1, is characterized in that, frequency domain generates signaling sequence set and comprises:
Determine the number of contained signaling sequence in the length of signaling sequence and signaling sequence set; Wherein, the number of described signaling sequence is the N power of 2, and N is positive integer;
Generate M signaling sequence subclass respectively, and the number of signaling sequence in each signaling sequence subclass is respectively m 1~ m m, and
Whole signaling sequences in each signaling sequence subclass are arranged together to form signaling sequence set in order;
Wherein, the root value of each signaling sequence subclass is different, and in all signaling sequences, the amplitude of each element is element amplitude in fixed sequence program
4. the generation method of frequency-domain OFDM symbol as claimed in claim 3, is characterized in that, generate each signaling sequence subclass and comprise:
Number based on described signaling sequence determines that CAZAC sequence generates the root value in formula; Wherein root value is greater than or equal to the twice of the number of signaling sequence;
According to selected root value, select a different set of q value to produce CAZAC sequence, wherein the number of q value equals the number of signaling sequence, and the value of q value is integer and is greater than 0 to be less than root value, and any two q value sums are not equal to root value;
Cyclic shift is carried out to produced CAZAC sequence; Wherein, the figure place of cyclic shift is determined by corresponding root value and q value;
Figure place according to the number of determined signaling sequence, q value and cyclic shift calculates required signaling sequence subclass.
5. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterized in that, the average power ratio R of described fixed sequence program and signaling sequence is 1.
6. the generation method of frequency-domain OFDM symbol as claimed in claim 2, it is characterized in that, described fixed sequence program length is 353, and mould is 1, and expression formula is:
FC ( n ) = e j&omega; n
Wherein, ω nvalue 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, it is characterized in that, in the signaling sequence set generated, the number of signaling sequence is 512, and this signaling sequence set comprises 4 signaling sequence subclass, the signaling sequence number that each signaling sequence subclass comprises is 128, and the length of signaling sequence is 353.
8. the generation method of frequency-domain OFDM symbol as claimed in claim 4, it is characterized in that, the parameter of each signaling sequence subclass is:
1) the root value of first signaling sequence subclass is 353;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
2) the root value of second signaling sequence subclass is 367;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
3) the root value of the 3rd signaling sequence subclass is 359;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
4) the root value of the 4th signaling sequence subclass is 373;
The value of q value is all numerical value in following form:
The figure place of cyclic shift is all numerical value in following form:
9. the generation method of leading symbol in physical frame, is characterized in that, comprise the steps:
Change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to the frequency-domain OFDM symbol of predetermined length; Wherein, described frequency-domain OFDM symbol is that the generation method of frequency-domain OFDM symbol according to claim 1 obtains;
The time-domain OFDM symbol of circulating prefix-length is intercepted as Cyclic Prefix from described time-domain OFDM symbol;
Time-domain OFDM symbol based on the described circulating prefix-length of above-mentioned intercepting generates modulation signal;
Leading symbol is generated based on described Cyclic Prefix, described time-domain OFDM symbol and described modulation signal.
10. the generation method of leading symbol in physical frame as claimed in claim 9, it is characterized in that, described predetermined length is 1024, and described circulating prefix-length is 520, and the length of modulation signal is 504.
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