CN104954309B - The generation method of leading symbol and the generation method of frequency-domain OFDM symbol - Google Patents
The generation method of leading symbol and the generation method of frequency-domain OFDM symbol Download PDFInfo
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- CN104954309B CN104954309B CN201410121324.0A CN201410121324A CN104954309B CN 104954309 B CN104954309 B CN 104954309B CN 201410121324 A CN201410121324 A CN 201410121324A CN 104954309 B CN104954309 B CN 104954309B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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Abstract
The invention discloses a kind of generation method of leading symbol in physical frame and the generation methods of frequency-domain OFDM symbol, and wherein the generation method of leading symbol includes: to generate fixed sequence program and signaling sequence respectively on frequency domain in physical frame；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 in effective subcarrier two sides to form the frequency-domain OFDM symbol of predetermined length；Inverse discrete fourier transform is made to obtain time-domain OFDM symbol to the frequency-domain OFDM symbol；Generate the modulated signal of the time-domain OFDM symbol；Leading symbol is generated based on the time-domain OFDM symbol and the modulated signal.The technical program solves in current DVB_T2 standard and other standards, and the problem of probability of failure occurs in leading symbol low complex degree receiving algorithm detection under frequency selective fading channels.
Description
Technical field
The present invention relates to wireless broadcast communication technical field, in particular to the generation method of leading symbol in a kind of physical frame
And the generation method of frequency-domain OFDM symbol.
Background technique
Generally for enabling the receiving end of ofdm system correctly to demodulate data transmitted by transmitting terminal, ofdm system is necessary
Realize between transmitting terminal and receiving end accurately and reliably time synchronization.Simultaneously as ofdm system is very quick to the frequency deviation of carrier wave
Sense, the receiving end of ofdm system it is also required to provide the carrier spectrum estimation method of precise and high efficiency, accurate to carry out to carrier wave frequency deviation
Estimation and correction.
Currently, it is real to realize that the transmitting terminal method synchronous with destination time is based on leading symbol in ofdm system
Existing.Leading symbol is all known symbol sebolic addressing of transmitting terminal and receiving end of ofdm system, and leading symbol is as physical frame
Start (being named as P1 symbol), P1 symbol only occurs once in each physical frame, it has indicated the beginning of the physical frame.P1 symbol
Number purposes include:
1) detect receiving end rapidly with determine transmitted in channel whether be expectation received signal；
2) basic configured transmission (such as FFT points, frame type information etc.) is provided so that receiving end can carry out after continued access
Receipts processing；
3) original carrier frequency deviation and timing error are detected, reaches frequency and Timing Synchronization after compensating.
The P1 Design of Symbols based on CAB spatial structure is proposed in DVB_T2 standard, preferably realizes above-mentioned function.But
It is still to have some limitations on low complex degree receiving algorithm.For example, in the long multipath letter of 1024,542 or 482 symbols
When road, relatively large deviation can be occurred by being timed thick synchronization using CAB structure, cause to estimate that carrier wave integer frequency offset occurs on frequency domain
Mistake.In addition, DPSK differential decoding may also can fail in frequency selective fading channels.
Summary of the invention
The invention solves in current DVB_T2 standard 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, the embodiment of the invention provides a kind of generation methods of leading symbol in physical frame, including
Following steps: fixed sequence program and signaling sequence are generated respectively on frequency domain；The fixed sequence program and signaling sequence are filled to having
It imitates on subcarrier, and is arranged between the fixed sequence program and signaling sequence in oem character set；In effective subcarrier two sides point
Not Tian Chong null sequence subcarrier to form the frequency-domain OFDM symbol of predetermined length；Discrete fourier is made to the frequency-domain OFDM symbol
Inverse transformation is to obtain time-domain OFDM symbol；Generate the modulated signal of the time-domain OFDM symbol；Based on the time-domain OFDM symbol
Leading symbol is generated with the modulated signal.
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, null sequence subcarrier is filled respectively in effective subcarrier two sides to form the frequency domain of predetermined length
OFDM symbol includes: to fill the null sequence subcarrier of equal length respectively in effective subcarrier two sides to form predetermined length
Frequency-domain OFDM symbol.
Optionally, the length of the null sequence subcarrier of every side filling is greater than critical length value, and the critical length value is by system
Symbol rate and predetermined length determine.
Optionally, the modulated signal for generating the time-domain OFDM symbol includes: one frequency displacement sequence of setting；It will be described
Time-domain OFDM symbol is multiplied by the modulated signal of the frequency displacement sequence to obtain the time-domain OFDM symbol.
Optionally, the length of the frequency displacement sequence is equal to or less than the length of the time-domain OFDM symbol.
Optionally, leading symbol is generated with the modulated signal based on the time-domain OFDM symbol to refer to: the modulation is believed
Protection interval number as the time-domain OFDM symbol, and spliced leading to generate in the front of the time-domain OFDM symbol
Symbol.
Optionally, the predetermined length is 1024.
Optionally, the fixed sequence program is pseudo-random binary sequence.
Optionally, fixed sequence program and signaling sequence are generated respectively on frequency domain in the step and the step will fixed sequence
Column and signaling sequence are filled to effective subcarrier, and between oem character set arrangement between the fixed sequence program and signaling sequence
Further include following steps: DBPSK mapping is carried out to fixed sequence program and signaling sequence respectively with after map fixed sequence program with
Signaling sequence.
The embodiment of the invention also provides a kind of generation methods of frequency-domain OFDM symbol, include the following steps: on frequency domain
Fixed sequence program and signaling sequence are generated respectively；The fixed sequence program and signaling sequence are filled to effective subcarrier, and described
It is arranged between fixed sequence program and signaling sequence in oem character set；Null sequence subcarrier is filled respectively in effective subcarrier two sides
To form the frequency-domain OFDM symbol of predetermined length.
Compared with prior art, technical solution of the present invention has the advantages that
It ensure that using the structure (as leading symbol) of the modulated signal of time-domain OFDM symbol and time-domain OFDM symbol
Receiving end utilizes the related peak value that may be significantly of delay.Further, during generating the leading symbol, time domain is designed
The modulated signal of OFDM symbol can to avoid receiving end by continuous wave CO_2 laser perhaps mono-tone interference or occur and modulated signal
The isometric multipath channel of length, or receive when protection interval length is identical with the length of modulated signal in signal and error detection occur
Peak value.
Detailed description of the invention
Fig. 1 is the process signal of the specific embodiment of the generation method of leading symbol in a kind of physical frame of the invention
Figure；
Fig. 2 is the schematic diagram for generating fixed sequence program in the present invention using pseudo-random binary sequence generator；
Fig. 3 is the frequency domain for utilizing the frequency-domain OFDM symbol generated in the generation method of leading symbol in physical frame of the invention
Distribution of carriers schematic diagram.
Specific embodiment
Inventor has found in current DVB_T2 standard and other standards that leading symbol is low under frequency selective fading channels
There is the problem of probability of failure in the detection of complexity receiving algorithm.
In view of the above-mentioned problems, inventor after study, provides a kind of generation method of leading symbol in physical frame, guarantee
Carrier frequency offset receiving end within the scope of -500kHz to 500kHz still can handle reception signal.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
The stream of the specific embodiment of the generation method of leading symbol in a kind of physical frame of the invention as shown in Fig. 1
Journey schematic diagram.With reference to Fig. 1, the generation method of leading symbol includes the following steps: in physical frame
Step S11: fixed sequence program and signaling sequence are generated 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
It is arranged between column in oem character set；
Step S13: null sequence subcarrier is filled respectively in effective subcarrier two sides to form the frequency domain of predetermined length
OFDM symbol；
Step S14: inverse discrete fourier transform is made to obtain time-domain OFDM symbol to the frequency-domain OFDM symbol；
Step S15: the modulated signal of the time-domain OFDM symbol is generated；
Step S16: 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, leading
The generation method of symbol is generation frequency-domain OFDM symbol, and the time domain corresponding based on the frequency-domain OFDM symbol on frequency domain
The modulated signal of OFDM symbol generates the leading symbol in time domain.
Specifically, as described in step S11, fixed sequence program and signaling sequence are generated respectively on frequency domain.Wherein, described solid
Sequencing column include that receiving end can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, the signaling sequence includes each
Basic configured transmission.
In the present embodiment, the fixed sequence program can be pseudo-random binary sequence.
For example, setting fixed sequence program as FC0,FC1..., FCN-2, it can be generated by pseudo-random binary sequence (PRBS) generator,
The specific generating process schematic diagram that fixed sequence program is generated using pseudo-random binary sequence generator as shown in Figure 2.In reality
In, which also can choose other kinds of sequence.
The signaling sequence is used to transmit the information (such as various signalings) of P bit, shares 2PA possibility, every kind of possibility
It is mapped to the signaling sequence that a length is M.Sequence group has 2PA sequence, and uncorrelated each other, at the same with it is known
Fixed sequence program is also uncorrelated.
In other embodiments, DBPSK can also be carried out to fixed sequence program and signaling sequence respectively according to system requirements to reflect
It penetrates.
Specifically, to fixed sequence program FC0,FC1,…,FCN-2DBPSK mapping is carried out, by FC0,FC1,…,FCN-2Mapping
AtFormula is as follows:
(SC is set as to signaling sequence0,SC1...,) DBPSK mapping is carried out, by SC0,SC1,,SCM-2It is mapped asFormula is as follows:
As described in step S12, the fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence
It is arranged between column and signaling sequence in oem character set.
In one preferred embodiment, the equal length of the length of the fixed sequence program and the signaling sequence, and
The length is less than the 1/2 of the predetermined length.Wherein, the predetermined length is 1024, but can also be according to being in practical application
System demand and change.
By taking predetermined length is 1024 as an example, if it is the effective subcarrier for carrying fixed sequence program that the length of fixed sequence program, which is N(,
Number is N), the number that the length of signaling sequence is M(i.e. effective subcarrier of carrier signaling sequence be 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
Odd subcarrier) on position, correspondingly, signaling sequence is filled to odd subcarrier (or even subcarrier) position, thus in frequency domain
The distribution of fixed sequence program and the arrangement of signaling sequence oem character set is presented on effective subcarrier.It should be noted that when fixing
When sequence and the inconsistent length of signaling sequence (such as M > 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, null sequence subcarrier is filled respectively in effective subcarrier two sides to form predetermined length
Frequency-domain OFDM symbol.
In a preferred embodiment, this step includes: to fill the zero of equal length respectively in effective subcarrier two sides
Sequence subcarrier is to form the frequency-domain OFDM symbol of predetermined length.
Along the example for being 1024 to predetermined length, G=1024-M-N of the length of null sequence subcarrier, two sides filling
(1024-M-N)/2 null sequence subcarrier.
Further, in order to guarantee that receiving end can still be located within the scope of -500kHz to 500kHz in carrier frequency offset
Reason receives signal, and the value of (1024-M-N)/2 is typically larger than critical length value (being set as TH), and the critical length value is by system symbol
Rate and predetermined length determine.For example, predetermined length is the system symbol rate of 1024,7.56M, thenFor example, M=N=350, then 162 null sequence subcarriers are respectively filled in G=324, two sides.
Therefore, subcarrier (i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024)0,P1_X1..., Pl_X1023By
Following manner filling generates:
Wherein,Locating odd even position can be interchanged.
As shown in Fig. 3 the frequency-domain OFDM symbol generated in the generation method using leading symbol in physical frame of the invention
Number frequency domain carriers distribution schematic diagram.
As described in step S14, inverse discrete fourier transform is made to obtain time-domain OFDM symbol to the frequency-domain OFDM symbol.
Inverse discrete fourier transform described in this step is that frequency-region signal is commonly converted into the mode of time-domain signal,
It will not go into details for this.
P1_Xi obtains time-domain OFDM symbol after making inverse discrete fourier transform:
As described in step S15, the modulated signal of the time-domain OFDM symbol is generated.
Specifically, this step includes: that a frequency displacement sequence 1) is arranged；2) by the time-domain OFDM symbol multiplied by the frequency displacement sequence
Column are 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 the window sequence of some simplification.
The modulated signal of time-domain OFDM symbol is P1_B (t), and P1_B (t) is by P1_A (t) multiplied by frequency displacement sequence M (t)
(i.e. P1_B (t)=P1_A (t) * M (t)) is obtained, and is used as the protection interval of P1_A (t).
As described in step S16, leading symbol is generated based on the time-domain OFDM symbol and the modulated signal.
Specifically, this step include: using the modulated signal as the protection interval of the time-domain OFDM symbol, and by its
Splicing is in the front of 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 part preceding B_len of A is taken to be modulated, it may be assumed that
The embodiment of the invention also provides the processing methods that a kind of receiving end receives signal.It is specific as follows:
Step S21: receiving signal, which is r (t).
Step S22: the demodulation of signal progress M (t) will be received；For example, fSH=1/ (1024T)
When, by the signal received multiplied by rear, order
Step S23: the signal after demodulation is postponed；For example, enabling r2(t)=r1(t-1024)。
Step S24: the signal after delay is subjected to related operation (i.e. r with the signal received2(t) phase is carried out with r (t)
Close) to obtain correlation (obtaining the position of timing coarse synchronization).
Step S25: correlation is subjected to Fast Fourier Transform (FFT) (FFT), frequency domain 1K signal is obtained, which is moved
After fixed sequence program is removed in site, the channel estimation value of fixed sequence program point is obtained.
Step S26: the channel estimation value is made into Fourier inversion (IFFT) and is then moved to time domain if there is obvious peak value
Digit is correct integer frequency bias, while peak value also indicates most powerful path position.
Step S27: time domain compensation integer frequency is to the rear to be carried out using time domain sequences corresponding with the fixed sequence program on frequency domain
It is locally associated, to calculate fractional part of frequency offset, and obtain accurate timing synchronization position.
Step S28: go out the channel estimation value of signaling sequence using the channel estimation value interpolation of fixed sequence program point in frequency domain, so
After carry out coherent demodulation, obtain signaling.
The embodiment of the invention also provides a kind of generation methods of frequency-domain OFDM symbol, include the following steps:
Step S31: fixed sequence program and signaling sequence are generated respectively on frequency domain；
Step S32: fixed sequence program and signaling sequence are filled to effective subcarrier, and the fixed sequence program and signaling sequence
It is arranged between column in oem character set；
Step S33: null sequence subcarrier is filled respectively in effective subcarrier two sides to form the frequency domain of predetermined length
OFDM symbol.
In the present embodiment, the specific implementation process for generating the step S31 to step S33 of frequency-domain OFDM symbol can refer to
Step S11 is to the detailed description of step S13 in the generation method of leading symbol in physical frame above, and details are not described herein.
That is, those skilled in the art can be with based on the method provided in this embodiment for generating frequency-domain OFDM symbol
On this basis using other embodiments (be not limited to above step S14 to step S16) to the frequency-domain OFDM symbol into
Row processing, to generate the leading symbol in time domain.
In conclusion the technical program (is made using the modulated signal of time-domain OFDM symbol and the structure of time-domain OFDM symbol
For leading symbol) it ensure that the peak value for utilizing delay correlation may be significantly in receiving end.Further, in generation, this is leading
In sign process, the modulated signal for designing time-domain OFDM symbol can be dry by continuous wave CO_2 laser or single-frequency to avoid receiving end
It disturbs, perhaps occurs and protection interval length and modulated signal in the isometric multipath channel of modulated signal length or reception signal
Length it is identical when there is error detection peak value.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, anything that does not depart from the technical scheme of the invention, and according to the present invention
Technical spirit any simple modifications, equivalents, and modifications to the above embodiments, belong to technical solution of the present invention
Protection scope.
Claims (3)
1. the generation method of leading symbol in a kind of physical frame, which comprises the steps of:
Obtain time-domain OFDM symbol；
The modulated signal of the time-domain OFDM symbol is generated,
Leading symbol is generated based on the time-domain OFDM symbol and the modulated signal,
Wherein, using the modulated signal as the protection interval of the time-domain OFDM symbol, when the modulated signal length is less than
The length of domain OFDM symbol takes the previous section of protection interval length in time-domain OFDM symbol to be modulated and obtains the modulation letter
Number, spliced at the rear portion of the time-domain OFDM symbol；The time-domain OFDM symbol is accorded with by the frequency-domain OFDM to predetermined length
It number is obtained as inverse discrete fourier transform, the predetermined length is 1024.
2. the generation method of leading symbol in physical frame as described in claim 1, which is characterized in that
The modulated signal for generating the time-domain OFDM symbol includes:
One frequency displacement sequence is set；
By the time-domain OFDM symbol multiplied by the modulated signal of the frequency displacement sequence to obtain the time-domain OFDM symbol.
3. the generation method of leading symbol in physical frame as claimed in claim 2, which is characterized in that
The length of the frequency displacement sequence is equal to or less than the length of the time-domain OFDM symbol.
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| CN201611013939.7A CN106603456A (en) | 2014-03-28 | 2014-03-28 | Generation method of preamble symbol and generation method of frequency-domain OFDM symbol |
| CN201611013351.1A CN106685877A (en) | 2014-03-28 | 2014-03-28 | Processing method of received signals of receiving end |
| CN201410121324.0A CN104954309B (en) | 2014-03-28 | 2014-03-28 | The generation method of leading symbol and the generation method of frequency-domain OFDM symbol |
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| CN201410121324.0A CN104954309B (en) | 2014-03-28 | 2014-03-28 | The generation method of leading symbol and the generation method of frequency-domain OFDM symbol |
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| CN201611013939.7A Division CN106603456A (en) | 2014-03-28 | 2014-03-28 | Generation method of preamble symbol and generation method of frequency-domain OFDM symbol |
| CN201611013351.1A Division CN106685877A (en) | 2014-03-28 | 2014-03-28 | Processing method of received signals of receiving end |
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| CN201410121324.0A Active CN104954309B (en) | 2014-03-28 | 2014-03-28 | 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 |
| CN105007145B (en) * | 2014-04-16 | 2018-12-18 | 上海数字电视国家工程研究中心有限公司 | The generation method of leading symbol and the generation method of frequency-domain OFDM symbol |
| CN111490957B (en) * | 2020-03-10 | 2023-06-16 | 北京睿信丰科技有限公司 | Method and device for generating preamble sequence in time domain |
| CN115173952B (en) * | 2022-06-29 | 2023-08-11 | 苏州大学 | Optimized receiving method of optical universal filtering multi-carrier optical access network |
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| CN1081416C (en) * | 1999-01-04 | 2002-03-20 | 北京邮电大学 | Frame structure suitable for wide-band code division multiple access signal transmission |
| US8599764B2 (en) * | 2003-09-02 | 2013-12-03 | Qualcomm Incorporated | Transmission of overhead information for reception of multiple data streams |
| CN1937604B (en) * | 2005-09-20 | 2013-01-16 | 中兴通讯股份有限公司 | Initial access frame synchronizing method and device for orthogonal frequency division multiplexing system |
| CN101374131B (en) * | 2007-08-20 | 2013-01-30 | 株式会社Ntt都科摩 | Method and apparatus of timing synchronization, leading symbol as well as method and apparatus for generating the same |
| CN101132268B (en) * | 2007-09-13 | 2011-07-13 | 中兴通讯股份有限公司 | Frame generation method based on orthogonal frequency division multiplexing technology in TDD mode |
| CN101170534B (en) * | 2007-10-31 | 2010-06-23 | 中兴通讯股份有限公司 | A timing rough synchronization capturing method for mobile multimedia broadcast system |
| US8248910B2 (en) * | 2008-01-29 | 2012-08-21 | Nokia Corporation | Physical layer and data link layer signalling in digital video broadcast preamble symbols |
| CN101437005B (en) * | 2008-12-12 | 2012-11-14 | 中国人民解放军理工大学通信工程学院 | Method for estimating integer multiple frequency deviation with timing error during communication synchronization process |
| CN101938444B (en) * | 2009-06-30 | 2014-06-18 | 中兴通讯股份有限公司 | Method and device for estimating and correcting frequency offset of orthogonal frequency division multiplexing system |
| CN101945071A (en) * | 2009-07-10 | 2011-01-12 | 中兴通讯股份有限公司 | Confirming method of synchronization sequence in multipoint collaborative environment, synchronizing method and device |
| CN101695063B (en) * | 2009-10-19 | 2011-12-21 | 中国电子科技集团公司第五十四研究所 | Method for rapidly synchronizing short preamble symbols |
| CN103581096B (en) * | 2013-03-25 | 2017-05-10 | 上海数字电视国家工程研究中心有限公司 | OFDM modulating and demodulating method and digital signal emitting and receiving system |
| CN103532898B (en) * | 2013-04-22 | 2017-03-22 | 上海数字电视国家工程研究中心有限公司 | OFDM training symbol synchronization method based on CAZAC sequence |
| CN103532899B (en) * | 2013-07-31 | 2016-07-06 | 上海数字电视国家工程研究中心有限公司 | Time domain OFDM synchronizing symbol generates and demodulation method, data frame transmission method |
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- 2014-03-28 CN CN201611013939.7A patent/CN106603456A/en not_active Withdrawn
- 2014-03-28 CN CN201410121324.0A patent/CN104954309B/en active Active
- 2014-03-28 CN CN201611013351.1A patent/CN106685877A/en not_active Withdrawn
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| CN106685877A (en) | 2017-05-17 |
| CN106603456A (en) | 2017-04-26 |
| CN104954309A (en) | 2015-09-30 |
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