CN106878223A - The generation method of frequency-domain OFDM symbol - Google Patents
The generation method of frequency-domain OFDM symbol Download PDFInfo
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- CN106878223A CN106878223A CN201611015653.2A CN201611015653A CN106878223A CN 106878223 A CN106878223 A CN 106878223A CN 201611015653 A CN201611015653 A CN 201611015653A CN 106878223 A CN106878223 A CN 106878223A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
Abstract
The invention discloses a kind of generation method of frequency-domain OFDM symbol, the generation method of wherein frequency-domain OFDM symbol comprises 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 is arranged in oem character set between the fixed sequence program and signaling sequence；Fill null sequence subcarrier respectively to form the frequency-domain OFDM symbol of predetermined length in effective subcarrier both sides, the technical program is solved in current DVB_T2 standards and other standards, and the problem of probability of failure occurs in leading symbol low complex degree receiving algorithm detection under frequency selective fading channels.
Description
The application is the divisional application of original bill, the application number 201410153040.X of original bill, April 16 2014 applying date
Day, invention and created name《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, the generation method of leading symbol in more particularly to a kind of physical frame
And the generation method of frequency-domain OFDM symbol.
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, be carried out accurately with to carrier wave frequency deviation
Estimation and correction.
At present, realize that transmitting terminal and the synchronous method of destination time are substantially come real based on leading symbol 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 receiving terminal is rapidly detected with determine to transmit in channel is the signal expecting to receive；
2) basic configured transmission (such as FFT points, frame type information etc.) is provided, so that receiving terminal can carry out rear continued access
Receipts treatment；
3) original carrier frequency deviation and timing error are detected, frequency and Timing Synchronization is 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 have some to limit on low complex degree receiving algorithm.For example, in 1024,542 or 482 multipath long letters of symbol
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 frequency selective fading channels, DPSK differential decodings are likely to fail.
The content of the invention
During what the present invention was solved is current DVB_T2 standards and other standards, leading symbol is in frequency selective fading channels
There is the problem of probability of failure in lower low complex degree receiving algorithm detection.
To solve the above problems, a kind of generation method of frequency-domain OFDM symbol is the embodiment of the invention provides, 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 in oem character set arrangement between the fixed sequence program and signaling sequence；Zero is filled respectively in effective subcarrier both sides
Sequence subcarrier is forming the frequency-domain OFDM symbol of predetermined length.
Optionally, the fixed sequence program be sequence of complex numbers, and the sequence of complex numbers in each plural mould be 1.
Optionally, n-th plural number is in the sequence of complex numbersWherein, ωnValue according to
Order is as shown in the table by rows from left to right：
Optionally, signaling sequence is generated on frequency domain to comprise the following steps：Generation consensus sequence；The consensus sequence is carried out
Cyclic shift is generating signaling sequence.
Optionally, the consensus sequence is expressed as：
The signaling sequence generated after displacement is circulated to the consensus sequence to be expressed as：Wherein kiIt is shift value, it is as shown in the table：
Optionally, the equal length of the length of the fixed sequence program and 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：The null sequence subcarrier of equal length is filled respectively to form predetermined length in effective subcarrier both sides
Frequency-domain OFDM symbol.
Optionally, per side, the length of the null sequence subcarrier of filling is more than critical length value, and the critical length value is by system
Symbol rate and predetermined length determine.
Optionally, the predetermined length is 1024.
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 generation frequency-domain OFDM symbol of above-mentioned frequency-domain OFDM symbol；Inverse discrete Fourier transform is made to the frequency-domain OFDM symbol
Change to obtain time-domain OFDM symbol；Generate the modulated signal of the time-domain OFDM symbol；Based on the time-domain OFDM symbol with should
Modulated signal generates leading symbol.
Optionally, the modulated signal of the generation time-domain OFDM symbol includes：One frequency displacement sequence is set；Will be described
Time-domain OFDM symbol is multiplied by the frequency displacement sequence to obtain the modulated signal of the time-domain OFDM symbol.
Optionally, refer to modulated signal generation leading symbol based on the time-domain OFDM symbol：The modulation is believed
Number as the time-domain OFDM symbol protection interval, and spliced the time-domain OFDM symbol front portion it is leading to generate
Symbol.
Optionally, the modulated signal of the generation time-domain OFDM symbol includes：One frequency displacement sequence is set；Respectively will
The shift sequence of the time-domain OFDM symbol and the time-domain OFDM symbol is multiplied by the frequency displacement sequence to obtain the time-domain OFDM symbol
The first modulated signal and the second modulated signal.
Optionally, refer to modulated signal generation leading symbol based on the time-domain OFDM symbol：Described first is adjusted
Signal processed and the second modulated signal and are spliced the two modulated signals respectively as the protection interval of the time-domain OFDM symbol
In the front and rear of the time-domain OFDM symbol generating 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 for providing 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, and wherein fixed sequence program can be made
It is the pilot tone in physical frame, consequently facilitating receiving terminal carries out decoding demodulation to leading symbol in the physical frame that receives.
Further, fixed sequence program uses sequence of complex numbers, and each plural mould is 1 in the sequence of complex numbers, so that after
The leading symbol of continuous generation has relatively low papr (Peak to Average Power Ratio, PAPR), and
Improve the probability of success that receiving terminal detects leading symbol.
Further, by the use of the modulated signal of time-domain OFDM symbol and the structure of time-domain OFDM symbol (as leading character
Number) ensure that in receiving terminal using the related peak value that may be significantly of delay.Also, during the leading symbol is generated,
Design time-domain OFDM symbol modulated signal can avoid receiving terminal be subject to continuous wave CO_2 laser or mono-tone interference, or occur with
Go out when protection interval length is identical with the length of modulated signal in the isometric multipath channel of modulated signal length, or reception signal
Existing error detection peak value.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of the specific embodiment of the generation method of frequency-domain OFDM symbol of the invention；
Fig. 2 is the frequency domain carriers point of the frequency-domain OFDM symbol generated using the generation method of frequency-domain OFDM symbol of the invention
Cloth schematic diagram；
Fig. 3 is that the flow of the specific embodiment of the generation method of leading symbol in a kind of physical frame of the invention is illustrated
Figure.
Specific embodiment
Inventor has found in current DVB_T2 standards and other standards that leading symbol is low under frequency selective fading channels
There is the problem of probability of failure in the detection of complexity receiving algorithm.
Regarding to the issue above, inventor is by research, there is provided the generation method and frequency of leading symbol in a kind of physical frame
The generation method of domain OFDM symbol, it is ensured that carrier frequency offset receiving terminal in the range of -500kHz to 500kHz can still be processed
Receive signal.
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
Specific embodiment be described in detail.
As shown in Fig. 1 a kind of flow of the specific embodiment of the generation method of frequency-domain OFDM symbol of the invention is shown
It is intended to.With reference to Fig. 1, the generation method of frequency-domain OFDM symbol 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 in oem character set between row；
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 arranges and can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, the signaling sequence including receiving terminal and include each
Basic configured transmission.
In the present embodiment, the fixed sequence program be sequence of complex numbers, and the sequence of complex numbers in each plural mould be 1.It is described
Signaling sequence is used for transmitting the P information of bit (such as various signalings), has 2PIndividual possibility, it is every kind of to be mapped to one
Length is the signaling sequence of M.Sequence group has 2PIndividual sequence, and uncorrelated each other, while with known fixed sequence program also not
It is related.
As described in step S12, the fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence
Arranged in oem character set between row and signaling sequence.
In one preferred embodiment, the equal length of the length of the fixed sequence program and the signaling sequence, and
1/2 of the length less than 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 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 as 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 the length of sequence and signaling sequence is inconsistent>N), can realize fixing by way of zero padding sequence subcarrier
Sequence and signaling sequence oem character set are arranged.
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 forming 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 determine.For example, system symbol rate of the predetermined length for 1024,7.61M, the sample rate of 9.14M, 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 exchange.
The frequency of the frequency-domain OFDM symbol for as shown in Fig. 2 being generated using the generation method of frequency-domain OFDM symbol of the invention
Domain distribution of carriers schematic diagram.
Using the generation method of the frequency-domain OFDM symbol described in the embodiment of the present invention, for above-mentioned steps S11, inventor's warp
Cross research and obtain a kind of specific embodiment of the sequence that fixed sequence program and signaling are generated on frequency domain.
Along to predetermined length be the 1024, length of the fixed sequence program with the equal length of the signaling sequence (all for
350) example.
Specifically, the fixed sequence program is sequence of complex numbers, and each plural mould is 1 in the sequence of complex numbers.For example, the plural number
N-th plural number is in sequenceWherein, ωnValue in order from left to right by rows
It is as shown in the table：
Wherein, the first row is that n is 0~9 corresponding ωnValue, the second row be n be 10~19 corresponding ωnValue, with this
Analogize, the 35th row is that n is 340~349 corresponding ωnValue.
Signaling sequence, for transmitting the P information of (such as P=8) bit, has 28Individual possibility, it is every kind of to be mapped
To the signaling sequence that length is 350.
Specifically, signaling sequence is generated on frequency domain to comprise the following steps：
1) consensus sequence is generated；
2) displacement is circulated to the consensus sequence to generate signaling sequence.
Wherein, the consensus sequence is part Zadoff-Chu sequence.For example, the consensus sequence can be expressed as：
The signaling sequence generated after displacement is circulated to the consensus sequence to be expressed as：Wherein kiIt is shift value, it is as shown in the table：
In other embodiments, optional 8 (correspondence P is 3) transmitted in 256 sequences, 16 (correspondence P is 4),
32 (correspondence P is 5), 64 (correspondence P is 6), 128 (correspondence P is 7) and 256 (correspondence P is 8) meet system to transmit
The signaling of P bit of demand, and the value of P is smaller, and the papr (PAPR) of the sequence subset selected will be more
It is low.
Finally, subcarrier (i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024)0,P1_X1,…,P1_X1023By
In the following manner filling generation：
WhereinPut odd even position can exchange.
The embodiment of the present invention additionally provides a kind of generation method of leading symbol in physical frame.As shown in Fig. 3 this hair
The schematic flow sheet of the specific embodiment of the generation method of leading symbol in a kind of bright physical frame.With reference to Fig. 3, in physical frame
The generation method of leading symbol comprises the following steps：
Step S21：Frequency-domain OFDM symbol is generated according to the generation method of above-mentioned frequency-domain OFDM symbol；
Step S22：The frequency-domain OFDM symbol is made inverse discrete fourier transform to obtain time-domain OFDM symbol；
Step S23：Generate the modulated signal of the time-domain OFDM symbol；
Step S24：Leading symbol is generated based on the time-domain OFDM symbol and the modulated signal.
It should be noted that leading symbol can be described from two domains of time domain and frequency domain.In the present embodiment, it is leading
The generation method of symbol is the generation frequency-domain OFDM symbol on frequency domain, and based on the corresponding time domain of the frequency-domain OFDM symbol
Leading symbol in the modulated signal generation time domain of OFDM symbol.
Wherein, the specific embodiment of the step S21 may be referred to the specific embodiment described in figure 1 above, herein not
Repeat again.
As described in step S22, the frequency-domain OFDM symbol 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_XiTime-domain OFDM symbol is obtained after making inverse discrete fourier transform：
As described in step S23, the modulated signal of the time-domain OFDM symbol is generated.
In example A, this step includes：1) a frequency displacement sequence is set；2) time-domain OFDM symbol is multiplied by this frequently
Sequence is moved to obtain the modulated signal of the time-domain OFDM symbol.
For example, set the frequency displacement sequence asWherein fSH=1/ (1024T).M (t) can also be set
Count into other sequences, such as m-sequence or some window sequences for simplifying.
The modulated signal of time-domain OFDM symbol is P1_B (t), and P1_B (t) is to be multiplied by frequency displacement sequence M (t) by P1_A (t)
(i.e. P1_B (t)=P1_A (t) * M (t)) is obtained, and is used as the protection interval of P1_A (t).
In example B, this step includes：1) a frequency displacement sequence is set；2) respectively by the time-domain OFDM symbol and should
The shift sequence of time-domain OFDM symbol is multiplied by the frequency displacement sequence to obtain first modulated signal and second of the time-domain OFDM symbol
Modulated signal.
For example, set the frequency displacement sequence asWherein fSH=1/ (1024T).M (t) can also be set
Count into other sequences, such as m-sequence or some window sequences for simplifying.
The time-domain OFDM symbol is P1_A (t), and the shift sequence of the time-domain OFDM symbol is P1_A (t-1024T).
As described in step S24, leading symbol is generated based on the time-domain OFDM symbol and the modulated signal.
In example A, this step includes：Using the modulated signal as the time-domain OFDM symbol protection interval, and
Spliced the front portion in the time-domain OFDM symbol to generate leading symbol.
For example, leading symbol can be generated according to following formula：
The length of protection interval might be less that the length of time-domain OFDM symbol, if the length of protection interval is B_len, when
The length of domain OFDM symbol is A, and the preceding B_len parts for taking A are modulated, i.e.,：
In example B, this step includes：Using first modulated signal and the second modulated signal as the time domain OFDM
The protection interval of symbol, and the two modulated signals are spliced the front and rear in the time-domain OFDM symbol to generate respectively
Leading symbol.
For example, leading symbol can be generated according to following formula：
Wherein, num1 is length of the splicing in the anterior modulated signal of the time-domain OFDM symbol, and the value of num1 is small
In the predetermined length (being 1024 in this example).Preferably, the value of num1 is 542.
In other embodiments, the generation method of the frequency-domain OFDM symbol for being provided based on foregoing embodiments, art technology
Personnel can on this basis use other embodiment (the step S22 to step S24 being not limited in Fig. 2) to the frequency domain
OFDM symbol is processed, 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 modification, equivalent variation and modification for being made to above example of technical spirit, belong to technical solution of the present invention
Protection domain.
Claims (5)
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 is in odd even between the fixed sequence program and signaling sequence
It is staggered；
Null sequence subcarrier is filled respectively to form the frequency-domain OFDM symbol of predetermined length in effective subcarrier both sides,
The fixed sequence program be sequence of complex numbers, and the sequence of complex numbers in each plural mould be 1,
The signaling sequence is used to transmit the P information of bit, has 2PIndividual possibility, it is every kind of to be mapped a signaling sequence,
Sequence group has 2PIndividual sequence, and it is uncorrelated each other, while also uncorrelated to known fixed sequence program.
2. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that
Wherein, the equal length of the length of the fixed sequence program and the signaling sequence, and the length is less than the frequency-domain OFDM
The 1/2 of the predetermined length of symbol.
3. the generation method of frequency-domain OFDM symbol as claimed in claim 2, it is characterised in that
Wherein, if the length of fixed sequence program for N be carry fixed sequence program effective subcarrier number for N, signaling sequence length
Spend for the number of M i.e. effective subcarrier of carrier signaling sequence is M,
The predetermined length of frequency-domain OFDM symbol is T, the G=T-M-N of the length of null sequence subcarrier, both sides filling (T-M-N)/2
Individual null sequence subcarrier.
4. the generation method of frequency-domain OFDM symbol as claimed in claim 3, it is characterised in that
Wherein, the value of null sequence subcarrier (T-M-N)/2 is typically larger than critical length value (being set to TH), and the critical length value is by being
System symbol rate and predetermined length determine.
5. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterised in that
Wherein, the fixed sequence program includes relevant information, the signaling sequence for doing carrier frequency synchronization and Timing Synchronization
Bit information including basic configured transmission.
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| CN201611015653.2A CN106878223A (en) | 2014-04-16 | 2014-04-16 | The generation method of frequency-domain OFDM symbol |
| CN201410153040.XA CN105007145B (en) | 2014-04-16 | 2014-04-16 | The generation method of leading symbol and the generation method of frequency-domain OFDM symbol |
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| CN105024963A (en) * | 2014-04-30 | 2015-11-04 | 上海数字电视国家工程研究中心有限公司 | Frequency domain OFDM symbol generation method and preamble symbol generation method |
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| US9843845B2 (en) | 2012-11-28 | 2017-12-12 | Sinclair Broadcast Group, Inc. | Terrestrial broadcast market exchange network platform and broadcast augmentation channels for hybrid broadcasting in the internet age |
| WO2016022287A1 (en) | 2014-08-07 | 2016-02-11 | Coherent Logix, Incorporated | Multi-partition radio frames |
| CA2956957C (en) | 2014-08-07 | 2019-02-12 | ONE Media, LLC | Dynamic configuration of a flexible orthogonal frequency division multiplexing phy transport data frame |
| BR122018067680B1 (en) | 2014-08-25 | 2023-10-17 | ONE Media, LLC | METHOD FOR ENCODING DATA, TRANSMITTER FROM A BASE STATION OR A BROADCAST PORT IN A BROADCAST NETWORK, METHOD FOR SIGNALING TERMINATION OF A CONTROL FRAME FROM A PREAMBLE OF A BROADCAST COMMUNICATION FRAME IN A BROADCAST NETWORK, AND CONFIGURED TRANSMITTER TO BE USED IN A BROADCAST NETWORK |
| KR102342727B1 (en) | 2015-03-09 | 2021-12-24 | 원 미디어, 엘엘씨 | System discovery and signaling |
| KR20230170776A (en) | 2015-04-08 | 2023-12-19 | 원 미디어, 엘엘씨 | Advanced data cell resource mapping |
| WO2017177010A1 (en) | 2016-04-07 | 2017-10-12 | ONE Media, LLC | Next generation terrestrial broadcasting platform aligned internet and towards emerging 5g network architectures |
| CN106453176B (en) * | 2016-12-13 | 2019-11-26 | 中国联合网络通信集团有限公司 | A kind of method, apparatus and system of offset estimation |
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Application publication date: 20170620 |