CN107302510A - The receiving handling method of frequency-domain OFDM symbol - Google Patents

The receiving handling method of frequency-domain OFDM symbol Download PDF

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Publication number
CN107302510A
CN107302510A CN201710317034.7A CN201710317034A CN107302510A CN 107302510 A CN107302510 A CN 107302510A CN 201710317034 A CN201710317034 A CN 201710317034A CN 107302510 A CN107302510 A CN 107302510A
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Prior art keywords
frequency
subcarrier
signaling
sequence
domain
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张文军
黄戈
邢观斌
徐洪亮
何大治
管云峰
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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    • 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
    • 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
    • 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

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

Abstract

A kind of receiving handling method of frequency-domain OFDM symbol, frequency-domain OFDM symbol includes：Effective subcarrier and null sequence subcarrier, wherein null sequence subcarrier are located at the both sides of effective subcarrier；Effective subcarrier includes fixed sequence program subcarrier and signaling sequence subcarrier, and fixed sequence program subcarrier and the arrangement of signaling sequence subcarrier oem character set；Receiving handling method includes：In the case of there is the leading symbol for expecting to receive in the baseband signal received, computing is carried out by the time-domain signal corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers of the signal comprising signaling sequence subcarrier, to solve in the frequency-domain OFDM symbol as the signaling information entrained by signaling sub-carriers.The technical program is solved in current DVB_T2 standards and other standards, and leading symbol low complex degree receiving algorithm under complex frequency Selective Fading Channel detects the problem of probability of failure occur.

Description

The receiving handling method of frequency-domain OFDM symbol
The application is the divisional application of original bill, the application number 201410326651.X of original bill, July 10 2014 applying date Day, invention and created name " receiving handling method of frequency-domain OFDM symbol ".
Technical field
The present invention relates to wireless broadcast communication technical field, more particularly to a kind of reception processing side of frequency-domain OFDM symbol Method.
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), only occur a P1 symbol in each physical frame or multiple P1 symbols continuously occur, it indicates The beginning of the physical frame.The purposes of P1 symbols includes：
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；
4) emergency alarm or broadcast system wake up.
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, in complex frequency Selective Fading Channel, such as during long multipath, DBPSK differential decodings be able to may also fail. Being additionally, since in DVB_T2 spatial structures does not have cyclic prefix, and if need carry out channel estimation frequency-domain structure combination, will make The problem of into its channel estimation in frequency domain performance degradation.
The content of the invention
During the problem of present invention is solved is current DVB_T2 standards and other standards, leading symbol is in complex frequency selectivity The problem of there is probability of failure in the detection of low complex degree receiving algorithm under fading channel.
To solve the above problems, the embodiment of the present invention provides a kind of receiving handling method of frequency-domain OFDM symbol, the frequency Domain OFDM symbol includes：Effective subcarrier and null sequence subcarrier, wherein null sequence subcarrier are located at the both sides of effective subcarrier； Effective subcarrier includes fixed sequence program subcarrier and signaling sequence subcarrier, and fixed sequence program subcarrier and signaling sequence subcarrier Oem character set is arranged；
The receiving handling method comprises the following steps：
In the case of there is the leading symbol for expecting to receive in the baseband signal received, by including signaling sequence The signal of carrier wave time-domain signal corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers carries out computing, with Solve in the frequency-domain OFDM symbol as the signaling information entrained by signaling sub-carriers；Wherein, the leading symbol is to be based on frequency domain Time-domain OFDM symbol that OFDM symbol is obtained after inverse fourier transform and generate.
Compared with prior art, technical solution of the present invention has the advantages that：
For the structure of specific frequency-domain OFDM symbol, there is the leading character for expecting to receive in the baseband signal received In the case of number, pass through the signal comprising signaling sequence subcarrier and signaling sequence t easet ofasubcarriers or the signaling sequence subcarrier Gather corresponding time-domain signal and carry out computing, to solve in the frequency-domain OFDM symbol as the signaling letter entrained by signaling sub-carriers Breath.Wherein, the leading symbol is based on the time-domain OFDM symbol that frequency-domain OFDM symbol is obtained after inverse fourier transform Generation.
The frequency-domain OFDM symbol includes：Effective subcarrier and null sequence subcarrier, wherein null sequence subcarrier are located at and had Imitate the both sides of subcarrier；Effective subcarrier includes fixed sequence program subcarrier and signaling sequence subcarrier, and fixed sequence program subcarrier With the arrangement of signaling sequence subcarrier oem character set.Designed by so specific frequency-domain structure, wherein fixed sequence program can conduct Pilot tone in physical frame, consequently facilitating receiving terminal carries out decoding demodulation to leading symbol in the physical frame that receives.
Brief description of the drawings
Fig. 1 is a kind of frequency domain carriers distribution schematic diagram of frequency-domain OFDM symbol of the present invention；
Fig. 2 is a kind of flow signal of the embodiment of the receiving handling method of frequency-domain OFDM symbol of the present invention Figure.
Embodiment
Inventor has found in current DVB_T2 standards and other standards that leading symbol is in complex frequency Selective Fading Channel The problem of there is probability of failure in lower low complex degree receiving algorithm detection.
In view of the above-mentioned problems, inventor by research there is provided a kind of receiving handling method of frequency-domain OFDM symbol, for The structure of specific frequency-domain OFDM symbol, in the case of there is the leading symbol for expecting to receive in the baseband signal received, It is corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers by the signal comprising signaling sequence subcarrier Time-domain signal carries out computing, to solve in the frequency-domain OFDM symbol as the signaling information entrained by signaling sub-carriers.
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 the frequency domain carriers distribution schematic diagram of a kind of frequency-domain OFDM symbol of the invention.With reference to Fig. 1, frequency Domain OFDM symbol includes：Effective subcarrier and null sequence subcarrier, wherein null sequence subcarrier (unused subcarriers in such as Fig. 1) Positioned at the both sides of effective subcarrier；Effective subcarrier includes fixed sequence program subcarrier and signaling sequence subcarrier, and fixed sequence program Subcarrier and the arrangement of signaling sequence subcarrier oem character set.I.e. fixed sequence program is filled to even subcarrier (or strange subcarrier) position On, correspondingly, signaling sequence is filled to strange subcarrier (or even subcarrier) position, so as to be on effective subcarrier of frequency domain The distribution of existing fixed sequence program and signaling sequence oem character set arrangement.And when the length of fixed sequence program and signaling sequence is inconsistent When, fixed sequence program and the arrangement of signaling sequence oem character set can be realized by way of zero padding sequence subcarrier.
Wherein, the generation method of signaling sequence and fixed sequence program can be：One is selected from all optional fixed sequence programs Individual fixed sequence program, and the signaling sequence set with good autocorrelation and cross correlation is generated, and based on the fixed sequence program Meeting required after inverse fourier transform with the OFDM symbol that any signaling sequence is constituted in signaling sequence set Power PAR.
One specific embodiment is,
Fixed sequence program length is 353, and amplitude is 1, as following formula is represented：
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
The number of signaling sequence is 512, and the signaling sequence set includes 4 signaling sequence subclass, each signaling Sequence subset is closed comprising 128 signaling sequences, and the length L of signaling sequence is 353.
The generation formula method of signaling sequence：
Digit (the q of cyclic shifti,ki, i=0~2N- 1) wherein N=7, represents that each signaling sequence subclass includes 128 Individual signaling sequence, altogether 4 subclass totally 512 signaling sequences；
First, CAZAC sequences are generated：
Then, cyclic shift is carried out to it：
si *(n)=[s (ki-1),s(ki),...,S(root-1),s(0),...,s(ki-1)]
Finally, intercepted length is L sequence since the head of above-mentioned sequence：
SCi(n)=si *(n), n=0~L-1
Resulting sequence SCi(n) it is i-th required of signaling sequence.
It in the average power ratio of fixed sequence program and signaling sequence, this example is 1. that R, which is,
1) the root values of first signaling sequence subclass 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
2) the root values of second signaling sequence subclass are 367；
The value of q values is all numerical value in following form：
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80
119 120 121 123 140 142 151 154 162 166 171 184 186 188 190
191 193 194 195 198 203 204 207 208 209 210 211 212 214 215
219 220 221 222 223 224 226 228 230 232 233 235 236 237 239
240 241 243 245 249 250 252 254 257 259 260 261 262 263 264
265 266 267 269 271 272 273 275 276 277 278 281 282 283 284
285 286 289 294 297 299 302 303 306 307 310 311 312 313 314
316 317 321 322 323 326 327 329 331 332 334 338 340 342 344
345 347 349 351 356 361 363 366
The digit of cyclic shift is all numerical value in following form：
3) the root values of the 3rd signaling sequence subclass are 359；
The value of q values is all numerical value in following form：
1 3 5 6 9 12 14 22 29 30 32 34 60 63 65
67 72 74 76 78 83 84 87 88 89 90 91 92 94 95
96 99 112 115 123 124 128 137 141 143 145 149 152 153 154
155 159 164 165 169 175 179 183 186 187 188 189 192 197 199
201 202 203 211 215 219 220 221 223 226 227 228 229 230 234
237 238 239 243 246 248 249 250 252 254 257 258 261 262 273
274 280 282 284 286 288 290 297 298 300 303 308 309 310 312
313 314 317 318 319 320 321 322 323 324 326 333 334 335 336
339 341 342 344 349 351 352 355
The digit of cyclic shift is all numerical value in following form：
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20
18 226 165 320 339 352 316 241 336 119 166 258 273 302 275
46 26 259 330 206 46 10 308 165 195 314 330 208 148 275
15 214 251 8 27 264 169 128 207 21 246 14 291 345 114
306 179 109 336 322 149 270 253 207 152 26 190 128 137 196
268 36 40 253 29 264 153 221 341 116 24 55 60 171 25
100 202 37 93 115 174 239 148 170 37 328 37 253 237 355
39 288 225 223 140 163 145 264 75 29 282 252 270 30 262
271 305 122 78 27 127 92 6
4) the root values of the 4th signaling sequence subclass are 373；
The value of q values is all numerical value in following form：
The digit of cyclic shift is all numerical value in following form：
333 337 177 125 169 270 254 88 123 310 96 273 120 239 157
224 62 119 19 235 136 117 237 100 244 181 295 249 356 9
289 139 82 171 178 292 158 308 257 42 55 210 320 294 100
75 79 163 195 80 303 97 271 179 359 178 241 281 367 58
91 7 179 39 267 245 213 286 349 172 35 301 361 102 301
155 1 34 96 293 202 87 176 248 319 301 168 280 154 244
215 370 260 117 30 329 42 149 112 125 50 249 197 273 230
13 142 244 335 57 21 261 48 370 110 296 326 224 77 112
31 262 121 38 283 323 93 94
This 4 signaling sequence subclass are merged, signaling sequence t easet ofasubcarriers are obtained.
Based on the architectural characteristic of above-mentioned frequency-domain OFDM symbol, the embodiments of the invention provide a kind of connecing for frequency-domain OFDM symbol Receiving processing method.As shown in Fig. 2 the embodiment of the receiving handling method of a kind of frequency-domain OFDM symbol of the invention Schematic flow sheet.
With reference to Fig. 2, receiving handling method comprises the following steps：
Step S11：In the case of there is the leading symbol for expecting to receive in the baseband signal received, by including letter The signal time-domain signal corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers of sequence subcarrier is made to enter Row computing, to solve in the frequency-domain OFDM symbol as the signaling information entrained by signaling sub-carriers.
It should be noted that in the present embodiment, the leading symbol is to pass through Fourier contravariant based on frequency-domain OFDM symbol The time-domain OFDM symbol that is obtained after changing and generate.For example, cyclic prefix and modulated signal are generated based on the time-domain OFDM symbol, So as to based on cyclic prefix, time-domain OFDM symbol and modulated signal generation leading symbol.In actual applications, transmitting terminal may be used also To be handled by the way of other are different time-domain OFDM symbol, to generate leading symbol, it will not be repeated here.
Wherein, the signal comprising signaling sequence subcarrier includes：It is described expect receive leading symbol whole or Person part time domain waveform, or the frequency-domain OFDM symbol obtained after time-domain OFDM symbol is fourier transformed is intercepted from leading symbol Number.Signaling sequence t easet ofasubcarriers are as formed by filling to effective subcarrier each signaling sequence in signaling sequence set Set.
Specifically, the N of correspondence ODFM symbol main bodys is interceptedAThe time-domain signal of length obtains frequency domain after carrying out Fourier transform OFDM symbol；Then, zero carrier is removed, the frequency domain signaling sub-carriers received are taken out according to signaling sub-carriers position.By its with Above-mentioned channel estimation value and known signaling sub-carriers collection carry out specific mathematical operation, complete frequency domain decoding function.
For example, setting i=0:M-1, M are signaling sub-carriers number, j=0:2P- 1, P make bit number for frequency domain is transmitted, i.e., Correspondence signaling sub-carriers collection has 2PIndividual element, and the sequence that each element correspondence length is M, HiFor each signaling sub-carriers pair The channel estimation value answered, SC_reciFor the frequency domain signaling sub-carriers value received,J-th of element is concentrated for signaling sub-carriers In i-th of value.ThenTake max (corrj) corresponding to j, Obtain the signaling information of frequency-domain transmission.
In other embodiments, said process can also be carried out in time domain, using known signaling sub-carriers collection through in Fu Corresponding time domain signaling waveform collection is directly synchronized with obtaining the time-domain received signal of multipath accurate location after leaf inverse transformation Correlation, takes that of correlation maximum absolute value, can also solve the signaling information of frequency-domain transmission, repeat no more here.
Further, receiving terminal can also do integer frequency offset estimation or channel estimation using fixed sequence program.
Specifically, the present embodiment also comprises the following steps：1) according to the determined leading symbol for expecting to receive in thing The position in frame is managed, interception includes the signal of fixed subcarrier；2) this is included to the signal and frequency domain stator of fixed subcarrier Carrier wave sequence or the corresponding time-domain signal of the frequency domain stator carrier wave sequence carry out computing, to obtain integer frequency offset estimation or letter Estimate in road.
Wherein, the signal comprising fixed subcarrier includes：The whole of the leading symbol for expecting to receive or portion Timesharing domain waveform, or the frequency-domain OFDM symbol obtained after time-domain OFDM symbol is fourier transformed is intercepted from leading symbol.
The two methods that receiving terminal carries out integer frequency offset estimation are detailed below.
Method 1：
According to position of the leading symbol detected in physical frame, the time domain of the leading symbol received is intercepted The all or part of waveform.By the way of frequency sweep, i.e., with fixed frequency change step footpath (such as, correspondence integer Times frequency deviation interval), the part time domain waveform is modulated after upper different frequency deviations, several time-domain signals are obtained：T is sampling period, fsFor sample frequency.And known frequency domain fixed sequence program It is A2 that carrier wave, which carries out the corresponding time-domain signal of inverse fourier transform, regard A2 as known signal and each A1yEnter line slip related, Choose that A1 for maximum correlation peaks occury, then the frequency deviation value y modulated to it is integer frequency offset estimation value.
Wherein, the frequency deviation region of confrontation required for swept frequency range correspondence system, such as, it is necessary to resist positive and negative 500K frequency Partially, and systematic sampling rate be 9.14M, leading symbol main body be 1K length, then swept frequency range beI.e. [- 57, 57]。
Method 2：
The time-domain signal of correspondence ODFM symbol main bodys obtains frequency-domain OFDM after carrying out Fourier transform in interception leading symbol Symbol, will convert the cyclic shift of the obtained above-mentioned swept frequency range of frequency-domain OFDM symbol progress, and is multiplied every 2 difference, and with Known fixed sequence subcarrier carries out related operations every 2 difference multiplied values, obtains a series of correlations, chooses maximal correlation It is worth corresponding cyclic shift, you can accordingly obtain that integer frequency offset estimation value can be obtained.
Using the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier that receive and/or its enter The corresponding time-domain signal of row inverse fourier transform completes channel estimation, can equally select to carry out and/or in frequency domain enter in time domain OK, it will not be repeated here.
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 (12)

1. a kind of receiving handling method of frequency-domain OFDM symbol, it is characterised in that
The frequency-domain OFDM symbol includes：Effective subcarrier and null sequence subcarrier, wherein, the null sequence subcarrier is located at institute State the both sides of effective subcarrier；Effective subcarrier includes fixed sequence program subcarrier and signaling sequence subcarrier, and described solid Sequencing row subcarrier and signaling sequence subcarrier oem character set arrangement；
The receiving handling method comprises the following steps：
In the case of there is the leading symbol for expecting to receive in the baseband signal received, by including signaling sequence subcarrier Corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers time-domain signal of signal carry out computing, to solve Go out in the frequency-domain OFDM symbol as the signaling information entrained by the signaling sub-carriers；
Wherein, the leading symbol is based on the time-domain OFDM symbol that frequency-domain OFDM symbol is obtained after inverse fourier transform Generation.
2. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that also comprise the following steps：
According to position of the identified leading symbol for expecting to receive in physical frame, interception includes fixed sequence program subcarrier Signal；
By the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier or the frequency domain fixed sequence program The corresponding time-domain signal of subcarrier carries out computing, to obtain integer frequency offset estimation or channel estimation.
3. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that described to include signaling sequence The signal of subcarrier includes：The all or part of time domain waveform of the leading symbol for expecting to receive, or expect from described The frequency-domain OFDM symbol obtained after time-domain OFDM symbol is fourier transformed is intercepted in the leading symbol of reception.
4. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that described to include fixed sequence program The signal of subcarrier includes：The all or part of time domain waveform of the leading symbol for expecting to receive, or expect from described The frequency-domain OFDM symbol obtained after time-domain OFDM symbol is fourier transformed is intercepted in the leading symbol of reception.
5. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that the integer frequency offset is estimated Meter, is the frequency-domain OFDM symbol obtained after being fourier transformed based on interception time-domain OFDM symbol in the leading symbol, carried out Difference is related and cyclic shift, and known frequency domain fixed sequence program subcarrier carry out difference correlation, and according to the result of both Carry out computing and obtain.
6. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that the integer frequency offset is estimated Meter, is based on the time-domain OFDM symbol in the leading symbol in the way of frequency sweep, with known frequency domain fixed sequence program subcarrier pair The time-domain signal computing answered and obtain.
7. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that the channel estimation, is In time domain and/or frequency domain, using the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier and/ Or the frequency domain fixed sequence program subcarrier carries out the corresponding time-domain signal of inverse fourier transform and carries out what computing was obtained.
8. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that solve the frequency-domain OFDM Specifically included in symbol as the step of the signaling information entrained by the signaling sub-carriers：
The all or part of time domain waveform of leading symbol based on certain the multipath accurate location of acquisition received, with known letter Make the corresponding time-domain signal of sequence t easet ofasubcarriers synchronize related operation one by one, utilize that of correlation maximum absolute value To solve corresponding signaling information.
9. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that solve the frequency-domain OFDM Specifically included in symbol as the step of the signaling information entrained by the signaling sub-carriers：
The frequency-domain OFDM symbol and channel estimation obtained after being fourier transformed based on interception time-domain OFDM symbol in leading symbol Value, and known signaling sequence t easet ofasubcarriers carry out specific mathematical operation, to solve in the leading symbol by signaling Signaling information entrained by carrier wave.
10. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that integer frequency offset is base For the subcarrier spacing of frequency-domain OFDM symbol.
11. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that signaling sequence Carrier set includes following characteristics：
The number of signaling sequence is 512, and the signaling sequence t easet ofasubcarriers include 4 signaling sequence subclass, each Signaling sequence subclass is comprising 128 signaling sequences, and the length L of signaling sequence is 353；
The generation method of signaling sequence is with formula：
Digit (the q of cyclic shifti,ki, i=0~2N- 1) wherein N=7, represents that each signaling sequence subclass includes 128 letters Sequence is made, 4 signaling sequence subsets amount to 512 signaling sequences altogether；
Generate CAZAC sequences：
<mrow> <msub> <mi>s</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mn>1</mn> <msqrt> <mi>R</mi> </msqrt> </mfrac> <mi>exp</mi> <mrow> <mo>(</mo> <mo>-</mo> <msub> <mi>j&amp;pi;q</mi> <mi>i</mi> </msub> <mi>n</mi> <mo>(</mo> <mrow> <mi>n</mi> <mo>+</mo> <mn>1</mn> </mrow> <mo>)</mo> <mo>/</mo> <mi>r</mi> <mi>o</mi> <mi>o</mi> <mi>t</mi> <mo>)</mo> </mrow> <mo>,</mo> <mi>n</mi> <mo>=</mo> <mn>0</mn> <mo>~</mo> <mi>r</mi> <mi>o</mi> <mi>o</mi> <mi>t</mi> <mo>-</mo> <mn>1</mn> </mrow>
To the sequence si(n) cyclic shift is carried out：
si *(n)=[s (ki-1),s(ki),...,S(root-1),s(0),...,s(ki-1)]
From the sequence si *(n) head starts the sequence that intercepted length is L：
SCi(n)=si *(n), n=0~L-1
Resulting sequence SCi(n) it is i-th required of signaling sequence；
Wherein, R is the average power ratio of fixed sequence program and signaling sequence；
1) the root values of first signaling sequence subclass 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
2) the root values of second signaling sequence subclass are 367；
The value of q values is all numerical value in following form：
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80 119 120 121 123 140 142 151 154 162 166 171 184 186 188 190 191 193 194 195 198 203 204 207 208 209 210 211 212 214 215 219 220 221 222 223 224 226 228 230 232 233 235 236 237 239 240 241 243 245 249 250 252 254 257 259 260 261 262 263 264 265 266 267 269 271 272 273 275 276 277 278 281 282 283 284 285 286 289 294 297 299 302 303 306 307 310 311 312 313 314 316 317 321 322 323 326 327 329 331 332 334 338 340 342 344 345 347 349 351 356 361 363 366
The digit of cyclic shift is all numerical value in following form：
3) the root values of the 3rd signaling sequence subclass are 359；
The value of q values is all numerical value in following form：
1 3 5 6 9 12 14 22 29 30 32 34 60 63 65 67 72 74 76 78 83 84 87 88 89 90 91 92 94 95 96 99 112 115 123 124 128 137 141 143 145 149 152 153 154 155 159 164 165 169 175 179 183 186 187 188 189 192 197 199 201 202 203 211 215 219 220 221 223 226 227 228 229 230 234 237 238 239 243 246 248 249 250 252 254 257 258 261 262 273 274 280 282 284 286 288 290 297 298 300 303 308 309 310 312 313 314 317 318 319 320 321 322 323 324 326 333 334 335 336 339 341 342 344 349 351 352 355
The digit of cyclic shift is all numerical value in following form：
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20 18 226 165 320 339 352 316 241 336 119 166 258 273 302 275 46 26 259 330 206 46 10 308 165 195 314 330 208 148 275 15 214 251 8 27 264 169 128 207 21 246 14 291 345 114 306 179 109 336 322 149 270 253 207 152 26 190 128 137 196 268 36 40 253 29 264 153 221 341 116 24 55 60 171 25 100 202 37 93 115 174 239 148 170 37 328 37 253 237 355 39 288 225 223 140 163 145 264 75 29 282 252 270 30 262 271 305 122 78 27 127 92 6
4) the root values of the 4th signaling sequence subclass are 373；
The value of q values is all numerical value in following form：
26 28 29 34 38 40 43 49 54 57 58 62 64 65 79 80 81 83 85 86 87 101 102 187 189 190 191 193 194 195 196 198 199 200 202 204 205 206 208 209 211 213 214 216 217 218 219 220 221 222 223 224 225 227 228 230 232 233 236 237 241 243 245 246 247 248 249 250 251 252 253 255 256 259 260 261 262 263 265 266 267 275 276 280 282 283 284 285 289 295 297 300 301 302 303 305 307 317 320 322 323 325 327 328 332 338 341 342 343 348 349 351 352 353 355 356 357 358 359 360 361 362 363 364 367 369 370 372
The digit of cyclic shift is all numerical value in following form：
333 337 177 125 169 270 254 88 123 310 96 273 120 239 157 224 62 119 19 235 136 117 237 100 244 181 295 249 356 9 289 139 82 171 178 292 158 308 257 42 55 210 320 294 100 75 79 163 195 80 303 97 271 179 359 178 241 281 367 58 91 7 179 39 267 245 213 286 349 172 35 301 361 102 301 155 1 34 96 293 202 87 176 248 319 301 168 280 154 244 215 370 260 117 30 329 42 149 112 125 50 249 197 273 230 13 142 244 335 57 21 261 48 370 110 296 326 224 77 112 31 262 121 38 283 323 93 94
This 4 signaling sequence subclass are merged, signaling sequence t easet ofasubcarriers are obtained.
12. the receiving handling method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that fixed sequence program Carrier wave includes following characteristics：
Fixed sequence program length is 353, and amplitude is 1, as following formula is represented：
<mrow> <mi>F</mi> <mi>C</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>=</mo> <msup> <mi>e</mi> <mrow> <msub> <mi>j&amp;omega;</mi> <mi>n</mi> </msub> </mrow> </msup> </mrow>
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
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