CN107046514A - The generation method of frequency-domain OFDM symbol - Google Patents

The generation method of frequency-domain OFDM symbol Download PDF

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Publication number
CN107046514A
CN107046514A CN201611079633.1A CN201611079633A CN107046514A CN 107046514 A CN107046514 A CN 107046514A CN 201611079633 A CN201611079633 A CN 201611079633A CN 107046514 A CN107046514 A CN 107046514A
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China
Prior art keywords
sequence
frequency
length
ofdm symbol
signaling sequence
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Inventor
张文军
徐洪亮
黄戈
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H04J13/14—Generation of codes with a zero correlation zone
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver

Abstract

The invention discloses a kind of generation method of frequency-domain OFDM symbol, wherein, the generation method of frequency-domain OFDM symbol includes：Generate fixed sequence program and signaling sequence respectively on frequency domain；Fixed sequence program and signaling sequence are filled to effective subcarrier, and arranged between the fixed sequence program and signaling sequence in oem character set；Fill null sequence subcarrier respectively to form the frequency-domain OFDM symbol of predetermined length in effective subcarrier both sides, wherein, CAZAC sequences are generated by predetermined sequence create-rule, cyclic shift is passed through to the CAZAC sequences, the signaling sequence is chosen from all CAZAC sequences according to the number of identified signaling sequence, avoid the signaling sequence of generation has cyclic shift or cyclic shift plus the characteristic of phase shift in time domain, and the problem of solving channel estimation in frequency domain hydraulic performance decline, further, it ensure that carrier frequency offset receiving terminal in the range of 500kHz to 500kHz can still handle reception signal.

Description

The generation method of frequency-domain OFDM symbol
Technical field
The present invention relates to wireless broadcast communication technical field, the generation method and thing of more particularly to a kind of frequency-domain OFDM symbol Manage the generation method of leading symbol in frame.
Background technology
The data transmitted by transmitting terminal are correctly demodulated generally for the receiving terminal for enabling ofdm system, ofdm system is necessary Realize between transmitting terminal and receiving terminal accurately and reliably time synchronized.Simultaneously as ofdm system is very quick to the frequency deviation of carrier wave Sense, the receiving terminal of ofdm system it is also required to provide the carrier spectrum method of estimation of precise and high efficiency, accurate to be carried out to carrier wave frequency deviation Estimation and correction.
At present, realize the transmitting terminal method synchronous with destination time substantially based on leading symbol come real in ofdm system Existing.Leading symbol is all known symbol sebolic addressing of transmitting terminal and receiving terminal of ofdm system, and leading symbol is as physical frame Start (being named as P1 symbols), P1 symbols only occur once in each physical frame, and it has indicated the beginning of the physical frame.P1 is accorded with Number purposes include：
1) whether make receiving terminal rapidly detect to determine to transmit in channel is the signal for expecting to receive；
2) basic configured transmission (such as FFT points, frame type information) is provided so that receiving terminal can carry out after continued access Receipts processing；
3) original carrier frequency deviation and timing error are detected, frequency and Timing Synchronization are reached after compensating.
The P1 Design of Symbols based on CAB spatial structures is proposed in DVB_T2 standards, above-mentioned functions are preferably realized.But It is still to have some limitations on low complex degree receiving algorithm.For example, 1024, the long multipath letter of 542 or 482 symbols During road, being timed using CAB structures slightly synchronously can occur relatively large deviation, cause to estimate that carrier wave integer frequency offset occurs on frequency domain Mistake.
In addition, it is necessary to first generate fixed sequence program and signaling sequence on frequency domain in generation frequency-domain OFDM sign process.But The signaling sequence generated using prior art, its papr is higher, and the signaling sequence circulates shifting in time domain The problem of position or cyclic shift add phase shift, this can cause to carry out coherent detection with receiving signal using time domain known array set When sending sequence, it can fail under multipath channel.
The content of the invention
The problem of present invention is solved is the signaling sequence generated using prior art, and its papr is higher, and Signaling sequence is the problem of cyclic shift or cyclic shift add phase shift in time domain.And propose and be based in DVB_T2 standards The problem of P1 Design of Symbols of CAB spatial structures can cause channel estimation in frequency domain hydraulic performance decline.
To solve the above problems, the embodiments of the invention provide a kind of generation method of frequency-domain OFDM symbol, including it is as follows Step：Generate fixed sequence program and signaling sequence respectively on frequency domain；Fixed sequence program and signaling sequence are filled to effective subcarrier On, and arranged between the fixed sequence program and signaling sequence in oem character set；Zero is filled respectively in effective subcarrier both sides Sequence subcarrier is to form the frequency-domain OFDM symbol of predetermined length.
Optionally, signaling sequence is generated on frequency domain includes：
Determine the length and number of signaling sequence；
Length and number based on the signaling sequence determine the root values in CAZAC sequences generation formula；Wherein, signaling The length of sequence is less than or equal to root values, and root values are more than or equal to twice of the number of signaling sequence；Root values The preferential length for being chosen for signaling sequence
The different q values of selection produce CAZAC sequences, and the wherein number of q values is equal to the number of signaling sequence, and any two Q value sums are not equal to root values；And produced CAZAC sequences are needed by cyclic shift, the digit of cyclic shift is by corresponding Root values and q values determine；
The signaling sequence is chosen from all CAZAC sequences according to the number of identified signaling sequence.
Optionally, the signaling sequence length is that the number of 353, signaling sequence is that 128, root values are 353；
The value of q values is all numerical value in following form：
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 form：
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
Optionally, signaling sequence is generated on frequency domain includes：
Determine the length and number of signaling sequence；
Length and number based on the signaling sequence determine several root values in CAZAC sequences generation formula；Wherein, The minimum value that the length of signaling sequence is less than or equal in several selected root values, and several selected root It is worth twice that sum is more than or equal to the number of signaling sequence；
For each root value, different q values are selected to produce CAZAC sequences, the number of wherein q values is less than or equal to The 1/2 of corresponding root values, and any two q value sums are not equal to corresponding root values；And produced CAZAC sequences need By cyclic shift, the digit of cyclic shift is determined by corresponding root values and q values；
The signaling sequence is chosen from each obtained CAZAC sequence according to the number of identified signaling sequence.
Optionally, for each root value, select the number of q values different, and the number summation of these q values is equal to signaling The number of sequence.
Optionally, a root value in several root values is chosen for the length of signaling sequence.
Optionally, the length of signaling sequence determined by the basis chooses institute from each obtained CAZAC sequence Stating signaling sequence includes：CAZAC sequences according to produced by the root values for the length for being chosen for signaling sequence determine the signaling Sequence.
Optionally, the root values are prime number.
Optionally, the generation of the fixed sequence program is that the signaling sequence calculating based on generation is obtained.
Optionally, the fixed sequence program is：
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
Optionally, the length of the fixed sequence program and the equal length of the signaling sequence, and the length is less than described pre- The 1/2 of measured length.
Optionally, fill null sequence subcarrier respectively to form the frequency domain of predetermined length in effective subcarrier both sides OFDM symbol includes：Fill the null sequence subcarrier of equal length respectively to form predetermined length in effective subcarrier both sides Frequency-domain OFDM symbol.
Optionally, the length for the null sequence subcarrier filled per side is more than critical length value, and the critical length value is by system Sample rate, symbol rate and predetermined length are determined.
Optionally, the predetermined length is 1024.
Optionally, the fixed sequence program and signaling sequence are permanent mode sequence.
Optionally, the mean power of fixed sequence program and signaling sequence is identical or different.
The embodiment of the present invention additionally provides a kind of generation method of leading symbol in physical frame, comprises the following steps：According to The generation method of above-mentioned frequency-domain OFDM symbol obtains the frequency-domain OFDM symbol of predetermined length；To the frequency-domain OFDM symbol of the predetermined length Number make inverse discrete fourier transform to obtain time-domain OFDM symbol；Determine circulating prefix-length；Cut from the time-domain OFDM symbol The time-domain OFDM symbol of the circulating prefix-length is taken as cyclic prefix；The circulating prefix-length based on above-mentioned interception Time-domain OFDM symbol generates modulated signal；Based on the generation of the cyclic prefix, the time-domain OFDM symbol and the modulated signal Leading symbol.
Optionally, modulated signal is generated in the time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception Also include afterwards：Determine the length of the modulated signal；Length based on the modulated signal, is used in the time-domain OFDM symbol In the part time-domain OFDM symbol of interception cyclic prefix, by selecting different original positions to transmit signaling information.
Optionally, the signaling information includes hook information, emitter flag information or other configured transmissions.
Optionally, the predetermined length is that the length of the 1024, circulating prefix-length and the modulated signal is 512.
Optionally, the time-domain OFDM symbol generation modulated signal package of the circulating prefix-length based on above-mentioned interception Include：One frequency displacement sequence is set；By the time-domain OFDM symbol of the circulating prefix-length or the part circulating prefix-length Time-domain OFDM symbol the frequency displacement sequence is multiplied by obtain the modulated signal.
Optionally, it is described based on the cyclic prefix, the time-domain OFDM symbol and modulated signal generation leading character Number include：The cyclic prefix is spliced to the front portion in the time-domain OFDM symbol as protection interval, and the modulation is believed Number splicing is at the rear portion of the OFDM symbol as frequency modulation part to generate leading symbol.
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 strange Even mode staggeredly is filled to effective subcarrier, is designed by so specific frequency-domain structure, wherein fixed sequence program can be made For the pilot tone in physical frame, consequently facilitating receiving terminal carries out decoding demodulation to leading symbol in the physical frame that receives.
Moreover, signaling sequence and fixed sequence program have less papr (Peak to using permanent mode sequence Average Power Ratio, PAPR), while avoiding the signaling sequence produced from having cyclic shift or cyclic shift in time domain Plus the characteristic of phase shift, the characteristic can cause to detect transmission sequence using time domain known array set is related to receiving signal progress When, the problem of failing under multipath channel.
The generation method of leading symbol in the physical frame provided according to embodiments of the present invention, it is true according to different channel circumstances Determine circulating prefix-length, and before time-domain OFDM symbol intercepts the time-domain OFDM symbol of the circulating prefix-length as circulation Sew, so that the problem of solving channel estimation in frequency domain hydraulic performance decline.And the circulating prefix-length based on above-mentioned interception Time-domain OFDM symbol generates modulated signal so that there is the leading symbol of generation good fractional part of frequency offset to estimate performance and timing Net synchronization capability.
Further, some or all of data that cyclic prefix is copied in time-domain OFDM symbol are can use in modulated signal Section, and by selecting different original positions to transmit signaling parameter.
Further, by the use of time-domain OFDM symbol modulated signal and the structure of time-domain OFDM symbol (is used as leading character Number) it ensure that the peak value for utilizing delay correlation may be significantly in receiving terminal.Also, during the leading symbol is generated, Design time-domain OFDM symbol modulated signal can avoid receiving terminal by continuous wave CO_2 laser either mono-tone interference or occur with The isometric multipath channel of modulated signal length, or receive to go out when protection interval length is identical with the length of modulated signal in signal Existing error detection peak value.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of the embodiment of the generation method of frequency-domain OFDM symbol of the present invention；
Fig. 2 is the flow signal of the embodiment of the generation method of leading symbol in a kind of physical frame of the invention Figure；
Fig. 3 is shown using the CAB structures of the leading symbol of the generation method generation of leading symbol in the physical frame shown in Fig. 2 It is intended to.
Embodiment
Inventor has found the signaling sequence generated using prior art, and its papr is higher, and signaling sequence The problem of cyclic shift or cyclic shift add phase shift in time domain.
In view of the above-mentioned problems, inventor is by research, there is provided a kind of generation method of frequency-domain OFDM symbol and physical frame The generation method of middle leading symbol.The signaling sequence produced is avoided to have the spy of cyclic shift or cyclic shift plus phase shift in time domain Property.And the problem of solving channel estimation in frequency domain hydraulic performance decline, modulated signal is generated using the time-domain OFDM symbol so that raw Into leading symbol there is good decimal frequency bias estimation and Timing Synchronization performance.Further, it is ensured that carrier frequency offset Receiving terminal can still handle reception signal in the range of -500kHz to 500kHz.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention Embodiment be described in detail.
As shown in Fig. 1 a kind of flow of the 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 comprises the following steps：
Step S11：Generate fixed sequence program and signaling sequence respectively on frequency domain；
Step S12：Fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence program and signaling sequence Arranged between row in oem character set；
Step S13：Fill null sequence subcarrier respectively to form the frequency domain of predetermined length in effective subcarrier both sides OFDM symbol.
Specifically, as described in step S11, fixed sequence program and signaling sequence are generated respectively on frequency domain.Wherein, it is described solid Sequencing row include receiving terminal and can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, the signaling sequence including each Basic configured transmission.
In the present embodiment, the fixed sequence program and signaling sequence are permanent mode sequence, and fixed sequence program and signaling sequence In each plural mould it is all equal.It should be noted that the plural number includes real number (i.e. plural imaginary part is zero).So, believe Make sequence identical with the mean power of fixed sequence program.
In other embodiments, the mean power of fixed sequence program and signaling sequence can be the same or different, can basis Practical application request is adjusted, and selection increases the power of fixed sequence program to obtain more preferable channel estimation and whole inclined estimation performance, or The power of person's selection increase signaling sequence is to improve the actual signal to noise ratio on signaling carrier to improve signaling decoding performance.
In the present embodiment, signaling sequence is generated on frequency domain can use any of the following two kinds mode, below The concrete mode of both generation signaling sequences is described in detail.
Mode 1：
1.1 determine the length and number of signaling sequence；
1.2 length and number based on the signaling sequence determine the root values in CAZAC sequences generation formula；Wherein, The length of signaling sequence is less than or equal to root values, and root values are more than or equal to twice of the number of signaling sequence.It is excellent Selection of land, root values are chosen for the length of signaling sequence.
For example, determining sequence length L and signaling number.Such as, N number of bit is passed, then signaling number num is 2NAnd select Select the root values of exp (j π qn (n+1)/root) in CAZAC sequences generation formula.Wherein, sequence length L is less than or equal to Root values, and root values are greater than equal to 2*num.Usual root values are prime number.
The different q values of 1.3 selections produce CAZAC sequences, and the wherein number of q values is equal to the number of signaling sequence, and arbitrarily Two q value sums are not equal to root values；And produced CAZAC sequences are needed by cyclic shift, the digit of cyclic shift by Corresponding root values and q values are determined.
For example, num different q of selection0、q1、……、qnum-1Produce CAZAC sequences：
S (n)=exp (j π qn (n+1)/root), n=0 ... root-1.
Sequence after cyclic shift is：
sk(n)=[s (k), s (k+1) ..., s (L-1), s (0) ..., s (k-1)]
Wherein, k is the digit of cyclic shift.
It should be noted that in the present embodiment, the q selectedi(0≤i≤num-1) must is fulfilled for following conditions：Any 2 Individual qi、qj(0≤i, j≤num-1) meets qi+qj≠root.
Under these conditions, prioritizing selection causes the low sequences of overall frequency-domain OFDM symbol PAPR.And if L is more than or equal to The autocorrelation value of the such sequence of 2*num, prioritizing selection root=L. is zero.
1.4 choose the signaling sequence according to the number of identified signaling sequence from all CAZAC sequences.Need Illustrate, if L=root, need not intercept, resulting CAZAC sequences can be used as signaling sequence.
For example, using each sequence truncation length in num sequence for L continuous part sequence or full sequence as Signaling sequence.
For example, signaling sequence length L=353, quantity num=128, then it is immediate prime number that root, which may be selected, 353.Q span is 1~352, and the span of each sequence cyclic shift digit is 1~353.In all optional letters Make in sequence, preferably go out following 128 groups, its q value and cyclic shift position are as shown in the table respectively：
Q value value forms
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
Cyclic shift digit form
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
According to above-mentioned known signaling sequence, calculating obtains a preferably fixed sequence program, and such as following formula is represented：
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
Mode 2：
2.1 determine the length and number of signaling sequence；
2.2 length and number based on the signaling sequence determine several root values in CAZAC sequences generation formula；Its In, the minimum value that the length of signaling sequence is less than or equal in several selected root values, and it is selected several Root values sum is more than or equal to twice of the number of signaling sequence.Preferably, root values are chosen for the length of signaling sequence.
For example, determining sequence length L and signaling number.Such as, N number of bit is passed, then signaling number num is 2N, and select Select some K root of exp (j π qn (n+1)/root) in CAZAC sequences generation formulak(0≤k≤K-1).Wherein, signaling sequence Row length L is less than or equal to all rootkIn minimum value, and several rootkAnd more than or equal to 2*num, i.e.,Usual rootkIt is worth for prime number.
2.3 are directed to each root value, select different q values generation CAZAC sequences, the number of wherein q values be less than or Equal to the 1/2 of corresponding root values, and any two q value sums are not equal to corresponding root values；And produced CAZAC sequences Need by cyclic shift, the digit of cyclic shift is determined by corresponding root values and q values.
For example, for each rootk(0≤k≤K-1), selects numkIndividual different q0、q1、Produce CAZAC sequences Arrange exp (j π qn (n+1)/rootk), n=0 ... rootk-1.Wherein,
And
In the manner 2, for each root value, different q values are selected to produce CAZAC sequences, and it is produced CAZAC sequences need the mode by cyclic shift to be referred to the description of aforesaid way 1, will not be repeated here.
It should be noted that in the present embodiment, the q selectedi(0≤i≤numk- 1) following conditions must are fulfilled for：Any 2 Individual qi、qj(0≤i,j≤numk- 1) q is meti+qj≠rootk。
Under these conditions, prioritizing selection causes the low sequences of overall frequency-domain OFDM symbol PAPR.And can prioritizing selection its In a root=L.The autocorrelation value for the sequence that so root is produced is zero.
2.4 choose the signaling sequence according to the number of identified signaling sequence from each obtained CAZAC sequence Row.If it is emphasized that wherein some root=L, produced according to the root values for the length for being chosen for signaling sequence CAZAC sequences determine the signaling sequence.
For example, using each sequence truncation length in num sequence for L continuous part sequence or full sequence as Signaling sequence.
For example, for example, L=353, num=128.It is 353 by the prioritizing selection root of mode 1.Then, q=1 is selected, 2,…128.Meet qi+qj≠353,(0≤i,j≤128-1).Finally, it is 353 by each sequence truncation to length.
In another example, L=350, num=256.It is 353, root2=359 by the selection of mode 2 root1, then for root1 =353, select q=1,2,3 ... 128 totally 128 sequences, qi+qj≠353.Then root2=359 is directed to, q=100 is selected, 101,102 ... 227 totally 128 sequences, altogether 256 sequence.It is finally 353 by each sequence truncation to length.
As described in step S12, the fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence In oem character set arrangement between row and signaling sequence.
In one preferred embodiment, the length of the fixed sequence program and the equal length of the signaling sequence, and The length is less than the 1/2 of the predetermined length.Wherein, the predetermined length be can also be according to being in 1024, but practical application System demand and change.
So that predetermined length is 1024 as an example, if the length of fixed sequence program, which is N, (carries effective subcarrier of fixed sequence program Number is N), the length of signaling sequence be M (i.e. the number of effective subcarrier of carrier signaling sequence is M), in the present embodiment, M=N.In other embodiments, N can also be slightly larger than M.
Between the fixed sequence program and signaling sequence in oem character set arrange, i.e., fixed sequence program fill to even subcarrier (or Strange subcarrier) on position, correspondingly, signaling sequence is filled to strange subcarrier (or even subcarrier) position, so that 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 fixation (such as M when sequence and the inconsistent length of signaling sequence>N), 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 S13, fill null sequence subcarrier respectively to form predetermined length in effective subcarrier both sides Frequency-domain OFDM symbol.
In a preferred embodiment, this step includes：The zero of equal length is filled respectively in effective subcarrier both sides Sequence subcarrier is to form the frequency-domain OFDM symbol of predetermined length.
Along to the example that predetermined length is 1024, the G=1024-M-N of the length of null sequence subcarrier, both sides filling (1024-M-N)/2 null sequence subcarrier.
Further, in order to ensure that receiving terminal can still be located in the range of -500kHz to 500kHz in carrier frequency offset Reason receives signal, and the value of (1024-M-N)/2 is typically larger than critical length value (being set to TH), and the critical length value is by system symbol Rate and predetermined length are determined.For example, predetermined length is 1024,7.61M system symbol rate, 9.14M sample rate, thenFor example, M=N=350, then G=324, both sides are respectively filled 162 null sequence subcarriers.
Therefore, subcarrier (i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024)0,P1_X1,…,P1_X1023By In the following manner filling generation：
Wherein,Residing odd even position can be exchanged.
As shown in Fig. 2 in a kind of physical frame of the invention the embodiment of the generation method of leading symbol stream Journey schematic diagram.With reference to Fig. 2, the generation method of leading symbol comprises the following steps in physical frame：
Step S21：Generation method according to above-mentioned frequency-domain OFDM symbol generates the frequency-domain OFDM symbol of predetermined length；
Step S22：The frequency-domain OFDM symbol of predetermined length is made inverse discrete fourier transform to obtain time-domain OFDM symbol；
Step S23：Determine circulating prefix-length；
Step S24：The time-domain OFDM symbol for intercepting the circulating prefix-length from the time-domain OFDM symbol is used as circulation Prefix；
Step S25：The time-domain OFDM symbol generation modulated signal of the circulating prefix-length based on above-mentioned interception；
Step S26：Leading symbol is generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal.
In the present embodiment, the implementation of the step S21 may be referred to the description of foregoing embodiments, no longer go to live in the household of one's in-laws on getting married herein State.
As described in step S22, the frequency-domain OFDM symbol of predetermined length is made inverse discrete fourier transform to obtain time domain OFDM symbol.
Inverse discrete fourier transform described in this step is the conventional mode that frequency-region signal is converted into time-domain signal, It will not go into details for this.
P1_XiMake to obtain time-domain OFDM symbol after inverse discrete fourier transform：
As described in step S23, circulating prefix-length is determined.
Unlike the prior art, in the present embodiment, it is necessary to add cyclic prefix (CP) before time-domain OFDM symbol, wirelessly Broadcast communication system can determine that the circulating prefix-length (is set to N according to different channel circumstancescp).For example, can basis Wireless broadcast communication system needs the multipalh length resisted to determine circulating prefix-length.That is, in generation leading symbol When, wireless broadcast communication system can determine that the multipalh length of confrontation required for the leading symbol, and with this determination cyclic prefix.
As described in step S24, the time-domain OFDM symbol for intercepting the circulating prefix-length from the time-domain OFDM symbol is made For cyclic prefix.
In the present embodiment, the circulating prefix-length is equal to or less than the predetermined length.With the predetermined length Exemplified by 1024, the circulating prefix-length can be 1024 or less than 1024.Preferably, the circulating prefix-length is 512, that is to say, that in this step, the latter half (length is 512) of the time-domain OFDM symbol is intercepted as cyclic prefix, So as to the problem of solving channel estimation in frequency domain hydraulic performance decline.
As described in step S25, the time-domain OFDM symbol generation modulation letter of the circulating prefix-length based on above-mentioned interception Number.In practice, the length of modulated signal can not exceed the length of cyclic prefix part.
Specifically, this step includes：
1) a frequency displacement 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 displacement sequence to obtain the modulated signal.
For example, setting NcpFor the circulating prefix-length of determination, LenBFor the length of modulated signal.If NcpBefore the circulation of determination Sew length, LenBFor the length of modulated signal.If NAFor the length of time-domain OFDM symbol, if the sampled point sequence of time-domain OFDM symbol Number be 0,1 ... NA- 1. set the sampled point sequence that N1 is copied to the corresponding time-domain OFDM symbol of starting point of modulated signal section as selection Number, N2 is copied to the corresponding time-domain OFDM symbol sampled point sequence number of terminal of modulated signal section for selection.Wherein,
N2=N1+LenB-1
For the ease of description, time-domain OFDM symbol is divided into 2 parts, first paragraph is not intercepted as before cyclic prefix Portion, second segment is rear portion of the interception as cyclic prefix.If intercepting time-domain OFDM symbol all as cyclic prefix, first paragraph For 0 length, N1 necessarily falls in second segment, that is, selects the scope of the part time-domain OFDM symbol to modulated signal section and will not surpass Go out interception as the scope of the part time-domain OFDM symbol of cyclic prefix.
As shown in figure 3, A segment tables show time-domain OFDM symbol in figure, C segment tables show cyclic prefix, and B segment tables show modulated signal. In one preferred embodiment, the length of the time-domain OFDM symbol is 1024, NcpFor 512, LenBAlso also it is for 512, N1 512。
The frequency displacement sequence isWherein fSHCorresponding frequency domain of time-domain OFDM symbol can be chosen for carry Wave spacing is 1/NAT, wherein T are sampling period, NAFor the length of above-mentioned time-domain OFDM symbol.In this example, NAFor 1024, take fSH=1/1024T.In order that correlation peak is sharp, fSHIt can also select 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 some window sequences simplified 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 multiplied by frequency displacement sequence M (t) to obtain, i.e., P1_B (t) is：
Wherein, N1 is that selection is copied to modulation letter The sampled point sequence number of the corresponding time-domain OFDM symbol of starting point of number section.
As described in step S26, generated based on the cyclic prefix, the time-domain OFDM symbol and the modulated signal leading Symbol.
Specifically, the cyclic prefix is spliced to the front portion in the time-domain OFDM symbol as protection interval, and by institute State modulated signal 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：
When being not required to the spatial structure transmission signaling with the leading symbol, when producing modulated signal, a fixation is only taken Starting point.Preferably, Len is setB=NcpAnd N1=NA-Ncp, i.e.,
Work as NA=1024, NcpWhen=512, LenB=512, N1=512, N2=1023.
In other embodiments, if the predetermined length is taken in other numerical value (not being 1024), above-mentioned P1 (t) formula 1024 will make corresponding numerical value (i.e. consistent with predetermined length) into, and NcpOther numerical value can also be made into, it is preferable that NcpFor The half of the predetermined length.
Further, also comprise the following steps after above-mentioned steps S14：
1) length of the modulated signal is determined；
2) length based on the modulated signal, when being used to intercept the part of cyclic prefix in the time-domain OFDM symbol In the OFDM symbol of domain, by selecting different original positions to transmit signaling information.
For example, the predetermined length is 1024, NCPFor 512, LenBFor 256.
Wherein, N1 can use 0≤i of 512+i*16 ＜ 16, then can represent 16 kinds it is different follow the example of, transmit 4bit signaling parameters. Different emitters can transmit the corresponding mark of the emitter, same emitter by taking different N1 to be led to Change N1 to send configured transmission when undue.
In another example, the predetermined length is 1024, NCPFor 1024, LenBFor 512,8 different starting points are set, N1 takes 64*i 0≤i ＜ 8, transmit 3bit signaling parameters.
In another example, the predetermined length is 1024, NCPFor 576, LenBFor 448,2 different N1 are set to transmit 1 ratio Special signaling, respectively 448 and 576 (subscript of the sampled point of time-domain OFDM symbol is since 0), i.e. from time-domain OFDM symbol 449 sampled points are as original position, or from the 577th of time-domain OFDM symbol as original position, to transmit 1 bit letter Order.
In another example, the predetermined length is 1024, NCPFor 512, LenBAlso it is that 512, N1 is also 512, does not transmit signaling.
In other embodiments, the generation method based on the above frequency-domain OFDM symbol, those skilled in the art Other embodiment (generation that leading symbol in the physical frame of the present embodiment offer is provided) can be used on this basis The frequency-domain OFDM symbol is handled, to generate the leading symbol in time domain.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this hair Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention Protection domain.

Claims (10)

1. a kind of generation method of frequency-domain OFDM symbol, it is characterised in that comprise the following steps：
Generate fixed sequence program and signaling sequence respectively on frequency domain；
Fixed sequence program and signaling sequence are filled to effective subcarrier, and are in odd even between the fixed sequence program and signaling sequence It is staggered or is occasionally very staggered；
Null sequence subcarrier is filled respectively to form the frequency-domain OFDM symbol of predetermined length in effective subcarrier both sides,
Wherein, CAZAC sequences are generated by predetermined sequence create-rule, cyclic shift is passed through to the CAZAC sequences, according to being determined The number of signaling sequence choose the signaling sequence from all CAZAC sequences.
2. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that signaling sequence is generated on frequency domain Including：
Determine the length and number of signaling sequence；
Length and number based on the signaling sequence determine the root values in CAZAC sequences generation formula；Wherein, signaling sequence Length be less than or equal to root values, and root values are more than or equal to twice of number of signaling sequence；
The different q values of selection produce CAZAC sequences, and the wherein number of q values is equal to the number of signaling sequence, and any two q values Sum is not equal to root values；And produced CAZAC sequences are needed by cyclic shift, the digit of cyclic shift is by corresponding Root values and q values are determined；
The signaling sequence is chosen from all CAZAC sequences according to the number of identified signaling sequence.
3. the generation method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that the signaling sequence length is 353rd, the number of signaling sequence is that 128, root values are 353；
The value of q values is all numerical value in following form：
The digit of cyclic shift is all numerical value in following form：
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
4. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that signaling sequence is generated on frequency domain Including：
Determine the length and number of signaling sequence；
Length and number based on the signaling sequence determine several root values in CAZAC sequences generation formula；Wherein, signaling The length of sequence be less than or equal to several selected root values in minimum value, and several selected root values it With twice of the number more than or equal to signaling sequence；
For each root value, different q values are selected to produce CAZAC sequences, the wherein number of q values is less than or equal to corresponding Root values 1/2, and any two q value sums are not equal to corresponding root values；And produced CAZAC sequences need by Cyclic shift, the digit of cyclic shift is determined by corresponding root values and q values；
The signaling sequence is chosen from each obtained CAZAC sequence according to the number of identified signaling sequence.
5. the generation method of frequency-domain OFDM symbol as claimed in claim 3, it is characterised in that the generation of the fixed sequence program is Signaling sequence based on generation calculates what is obtained.
6. the generation method of frequency-domain OFDM symbol as claimed in claim 5, it is characterised in that the fixed sequence program is：
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 1, it is characterised in that the length of the fixed sequence program with The equal length of the signaling sequence, and the length is less than the 1/2 of the predetermined length.
8. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that in effective subcarrier both sides Filling null sequence subcarrier is included with the frequency-domain OFDM symbol for forming predetermined length respectively：Distinguish in effective subcarrier both sides The null sequence subcarrier of equal length is filled to form the frequency-domain OFDM symbol of predetermined length.
9. the generation method of frequency-domain OFDM symbol as claimed in claim 8, it is characterised in that null sequence filled per side is carried The length of ripple is more than critical length value, and the critical length value is determined by systematic sampling rate, symbol rate and predetermined length.
10. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that the fixed sequence program and signaling The mean power of sequence is identical or difference.
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