CN105007145A - Method for generating preamble symbol and method for generating frequency domain OFDM symbol - Google Patents

Method for generating preamble symbol and method for generating frequency domain OFDM symbol Download PDF

Info

Publication number
CN105007145A
CN105007145A CN201410153040.XA CN201410153040A CN105007145A CN 105007145 A CN105007145 A CN 105007145A CN 201410153040 A CN201410153040 A CN 201410153040A CN 105007145 A CN105007145 A CN 105007145A
Authority
CN
China
Prior art keywords
ofdm symbol
domain ofdm
sequence
frequency
symbol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410153040.XA
Other languages
Chinese (zh)
Other versions
CN105007145B (en
Inventor
张文军
徐洪亮
黄戈
何大治
管云峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai National Engineering Research Center for Nanotechnology Co Ltd
Shanghai National Engineering Research Center of Digital Television Co Ltd
Original Assignee
Shanghai National Engineering Research Center of Digital Television Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai National Engineering Research Center of Digital Television Co Ltd filed Critical Shanghai National Engineering Research Center of Digital Television Co Ltd
Priority to CN201611014234.7A priority Critical patent/CN106685878A/en
Priority to CN201611015653.2A priority patent/CN106878223A/en
Priority to CN201410153040.XA priority patent/CN105007145B/en
Priority to CN201611199976.1A priority patent/CN106998312B/en
Priority to KR1020197012400A priority patent/KR102108291B1/en
Priority to PCT/CN2015/076808 priority patent/WO2015158292A1/en
Priority to CA2945857A priority patent/CA2945857C/en
Priority to PCT/CN2015/076812 priority patent/WO2015158293A1/en
Priority to KR1020167032058A priority patent/KR102033742B1/en
Priority to PCT/CN2015/076815 priority patent/WO2015158296A1/en
Priority to US15/304,853 priority patent/US10411929B2/en
Priority to CA2945858A priority patent/CA2945858C/en
Priority to KR1020197038044A priority patent/KR102196222B1/en
Priority to PCT/CN2015/076813 priority patent/WO2015158294A1/en
Priority to US15/304,851 priority patent/US11071072B2/en
Priority to KR1020167032059A priority patent/KR102062221B1/en
Priority to KR1020167032055A priority patent/KR102048221B1/en
Priority to PCT/CN2015/076814 priority patent/WO2015158295A1/en
Priority to US15/304,856 priority patent/US10574494B2/en
Priority to KR1020167032043A priority patent/KR101974621B1/en
Priority to KR1020167032057A priority patent/KR101975551B1/en
Priority to KR1020197033488A priority patent/KR102191859B1/en
Priority to US15/304,857 priority patent/US10148476B2/en
Priority to KR1020207036622A priority patent/KR102347011B1/en
Priority to KR1020197018441A priority patent/KR102114352B1/en
Priority to CA3212005A priority patent/CA3212005A1/en
Priority to CA3211647A priority patent/CA3211647A1/en
Priority to KR1020207035510A priority patent/KR102234307B1/en
Priority to KR1020207014009A priority patent/KR102223654B1/en
Priority to CA2945856A priority patent/CA2945856C/en
Priority to US15/304,854 priority patent/US10778484B2/en
Priority to CA2945855A priority patent/CA2945855A1/en
Priority to CA2945854A priority patent/CA2945854A1/en
Publication of CN105007145A publication Critical patent/CN105007145A/en
Priority to US16/172,662 priority patent/US11201770B2/en
Priority to US16/172,727 priority patent/US11025465B2/en
Application granted granted Critical
Publication of CN105007145B publication Critical patent/CN105007145B/en
Priority to US16/726,927 priority patent/US11012275B2/en
Priority to US16/726,928 priority patent/US10958494B2/en
Priority to US16/992,040 priority patent/US11128504B2/en
Priority to US16/992,038 priority patent/US11088884B2/en
Priority to US16/992,041 priority patent/US11088885B2/en
Priority to US16/992,039 priority patent/US11082274B2/en
Priority to US17/351,197 priority patent/US11799706B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Landscapes

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

Abstract

The invention discloses a method for generating a preamble symbol and a method for generating a frequency domain OFDM symbol. The method for generating the frequency domain OFDM symbol comprises the following steps: respectively generating a fixed sequence and a signaling sequence on a frequency domain; filling an effective subcarrier with the fixed sequence and the signaling sequence, wherein the fixed sequence and the signaling sequence are in odd-even staggered arrangement; and respectively filling the two sides of the effective subcarrier with a zero sequence subcarrier so as to form the frequency domain OFDM symbol with a predetermined length. According to the technical scheme provided by the invention, the problem of failure probability of the preamble symbol in low-complexity receiving algorithm detection in case of a frequency selective fading channel in a conventional DVB_T2 standard or other standards is solved.

Description

The generation method of leading symbol and the generation method of frequency-domain OFDM symbol
Technical field
The present invention relates to wireless broadcast communication technical field, particularly the generation method of leading symbol and the generation method of frequency-domain OFDM symbol in a kind of physical frame.
Background technology
Generally for the data making the receiving terminal of ofdm system correctly can demodulate transmitting terminal to send, ofdm system must to realize between transmitting terminal and receiving terminal time synchronized accurately and reliably.Meanwhile, because ofdm system is very responsive to the frequency deviation of carrier wave, the receiving terminal of ofdm system also needs the carrier spectrum method of estimation providing precise and high efficiency, to estimate accurately carrier wave frequency deviation and to correct.
At present, transmitting terminal is realized in ofdm system and the synchronous method of destination time realizes based on leading symbol substantially.Leading symbol is the symbol sebolic addressing that the transmitting terminal of ofdm system and receiving terminal are all known, and leading symbol is as the beginning (called after P1 symbol) of physical frame, and P1 symbol only occurs once in each physical frame, and it has indicated the beginning of this physical frame.The purposes of P1 symbol includes:
1) whether what make receiving terminal detect rapidly to determine to transmit in channel is the signal expecting to receive;
2) basic transformation parameter (such as FFT counts, frame type information etc.) is provided, receipt of subsequent process can be carried out to make receiving terminal;
3) detect original carrier frequency deviation and timing error, after compensating, reach frequency and Timing Synchronization.
Propose the P1 Design of Symbols based on CAB spatial structure in DVB_T2 standard, achieve above-mentioned functions preferably.But, low complex degree receiving algorithm still has some limit to.Such as, when the long multipath channel of 1024,542 or 482 symbols, utilizing CAB structure to carry out timing coarse synchronization can there is relatively large deviation, causes frequency domain being estimated mistake appears in carrier wave integer frequency offset.In addition, when frequency selective fading channels, DPSK differential decoding also may lose efficacy.
Summary of the invention
What the present invention solved is in current DVB_T2 standard and other standards, and leading symbol low complex degree receiving algorithm under frequency selective fading channels detects the problem occurring probability of failure.
For solving the problem, embodiments providing a kind of generation method of frequency-domain OFDM symbol, comprising the steps: to generate fixed sequence program and signaling sequence respectively on frequency domain; Fixed sequence program and signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence; Null sequence subcarrier is filled respectively to form the frequency-domain OFDM symbol of predetermined length in described effective subcarrier both sides.
Optionally, described fixed sequence program is sequence of complex numbers, and in this sequence of complex numbers, the mould of each plural number is 1.
Optionally, in this sequence of complex numbers, the n-th plural number is , n=0,1 ... 349; Wherein, ω nvalue as shown in the table by rows from left to right in order:
4.12 1.71 1.17 5.09 5.77 4.96 2.94 4.86 0.46 2.17
1.68 5.97 3.97 4.56 4.59 2.41 5.46 6.01 2.13 3.70
2.71 3.70 4.46 5.98 3.71 2.36 5.37 3.93 0.92 5.68
0.52 1.18 1.12 2.65 0.73 1.44 1.43 3.71 5.70 2.20
3.60 4.21 5.48 5.28 5.19 6.15 1.91 0.30 5.84 2.14
5.47 4.23 3.84 5.76 4.25 4.22 4.24 2.42 3.46 1.73
5.78 0.78 0.08 2.22 2.76 2.10 2.77 4.21 2.95 2.28
1.98 4.29 2.85 0.27 2.88 6.10 1.57 2.32 0.56 4.09
0.45 5.18 0.16 5.62 2.62 1.29 6.23 5.97 3.17 4.33
0.49 2.42 3.88 2.45 4.66 3.58 1.76 0.46 3.64 5.08
2.12 4.36 2.81 5.40 2.16 3.10 0.58 4.89 0.92 2.97
3.78 6.03 4.15 1.53 1.17 4.24 0.14 4.03 5.57 1.80
2.66 4.84 4.23 4.65 1.52 3.68 0.26 5.86 1.25 4.36
5.48 5.85 0.84 0.14 1.43 1.02 4.26 1.88 0.54 5.78
0.96 0.74 3.14 2.88 5.88 1.14 5.86 1.54 4.69 1.31
5.92 5.65 3.97 4.98 3.53 5.87 1.04 2.14 1.73 2.17
5.43 0.65 1.94 6.05 5.09 6.02 2.21 3.93 2.32 0.30
1.69 5.96 0.38 0.47 1.21 0.74 6.08 5.11 2.36 3.06
4.18 0.59 2.27 2.62 3.56 1.15 5.21 4.92 2.22 1.60
6.11 4.06 0.48 5.19 4.69 5.54 6.00 2.38 3.14 4.72
2.87 0.86 2.82 1.17 1.43 6.14 5.15 4.07 0.15 4.07
0.92 0.62 4.47 4.57 2.61 5.72 2.78 2.49 2.58 3.54
4.24 0.42 2.44 3.79 0.64 1.44 3.38 3.61 0.46 4.15
4.90 4.25 1.92 5.61 3.38 0.44 3.28 5.47 4.82 5.24
2.32 3.64 3.00 6.16 2.16 1.62 2.23 3.06 5.41 3.59
2.57 4.09 6.00 2.58 5.97 6.11 2.19 1.57 1.83 3.83
5.81 2.80 3.95 3.00 5.72 2.37 3.62 3.12 5.09 2.60
2.04 2.94 0.17 0.45 5.80 1.41 2.25 0.11 1.74 3.47
1.20 1.12 3.99 4.04 2.58 0.58 4.90 1.47 2.93 2.09
5.78 3.49 2.13 4.56 0.91 4.58 0.20 2.56 3.81 3.92
6.08 5.32 2.24 2.80 5.45 4.14 0.42 0.44 2.16 2.45
2.38 0.71 4.14 2.29 4.77 5.11 3.21 3.50 6.11 6.10
3.12 3.53 0.30 3.98 4.10 3.15 1.44 0.26 3.64 0.33
5.62 6.26 4.73 2.11 3.08 0.01 0.48 2.94 4.29 5.56
5.38 0.58 5.57 2.68 5.08 6.26 5.88 3.54 2.11 4.43
Optionally, frequency domain generates signaling sequence to comprise the steps: to generate consensus sequence; Cyclic shift is carried out to generate signaling sequence to this consensus sequence.
Optionally, described consensus sequence is expressed as: , n=0 ~ 349;
The signaling sequence generated after carrying out cyclic shift to described consensus sequence is expressed as: SC ‾ i = z ( k i - 1 ) , z ( k i ) , . . . , z ( 340 ) , z ( 0 ) , . . . , z ( k i - 2 ) , I=0,1 ... 349 wherein k ifor shift value, as shown in the table:
Optionally, the length of described fixed sequence program is equal with the length of described signaling sequence, and this length is less than 1/2 of described predetermined length.
Optionally, fill null sequence subcarrier respectively in described effective subcarrier both sides to comprise with the frequency-domain OFDM symbol forming predetermined length: fill the null sequence subcarrier of equal length respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length.
Optionally, the length of the null sequence subcarrier that every side is filled is greater than critical length value, and this critical length value is determined by system symbol rate and predetermined length.
Optionally, described predetermined length is 1024.
The embodiment of the present invention additionally provides the generation method of leading symbol in a kind of physical frame, comprises the steps: that the generation method according to above-mentioned frequency-domain OFDM symbol generates frequency-domain OFDM symbol; Change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to described frequency-domain OFDM symbol; Generate the modulation signal of described time-domain OFDM symbol; Leading symbol is generated based on described time-domain OFDM symbol and this modulation signal.
Optionally, the modulation signal of the described time-domain OFDM symbol of described generation comprises: arrange a frequency displacement sequence; Described time-domain OFDM symbol is multiplied by this frequency displacement sequence to obtain the modulation signal of this time-domain OFDM symbol.
Optionally, generate leading symbol based on described time-domain OFDM symbol and this modulation signal and refer to: using the protection interval of described modulation signal as described time-domain OFDM symbol, and spliced in the front portion of described time-domain OFDM symbol to generate leading symbol.
Optionally, the modulation signal of the described time-domain OFDM symbol of described generation comprises: arrange a frequency displacement sequence; Respectively the shift sequence of described time-domain OFDM symbol and this time-domain OFDM symbol is multiplied by this frequency displacement sequence to obtain the first modulation signal and second modulation signal of this time-domain OFDM symbol.
Optionally; generate leading symbol based on described time-domain OFDM symbol and this modulation signal to refer to: using described first modulation signal and the second modulation signal protection interval as described time-domain OFDM symbol, and the front and rear spliced respectively by these two modulation signals at described time-domain OFDM symbol is to generate leading symbol.
Compared with prior art, technical solution of the present invention has following beneficial effect:
According to the generation method of the frequency-domain OFDM symbol that the embodiment of the present invention provides, fixed sequence program and signaling sequence are filled on effective subcarrier in the mode of oem character set, by so specific frequency-domain structure design, wherein fixed sequence program can as the pilot tone in physical frame, thus is convenient to receiving terminal and carries out decoding demodulation to leading symbol in the physical frame received.
Further, fixed sequence program adopts sequence of complex numbers, in this sequence of complex numbers, the mould of each plural number is 1, the leading symbol of follow-up generation is made to have lower papr (Peakto Average Power Ratio like this, and improve receiving terminal and detect the probability of success of leading symbol PAPR).
Further, utilize the modulation signal of time-domain OFDM symbol and the structure (as leading symbol) of time-domain OFDM symbol ensure that and to utilize at receiving terminal and postpone relevantly can obtain obvious peak value.And; in this leading symbol process of generation; the modulation signal of design time-domain OFDM symbol can avoid receiving terminal to be subject to continuous wave CO_2 laser or mono-tone interference; or occur and the isometric multipath channel of modulation signal length, or occur error detection peak value when protecting gap length identical with the length of modulation signal in Received signal strength.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the generation method of a kind of frequency-domain OFDM symbol of the present invention;
Fig. 2 is the frequency domain carriers distribution schematic diagram of the frequency-domain OFDM symbol utilizing the generation method of frequency-domain OFDM symbol of the present invention to generate;
Fig. 3 is the schematic flow sheet of the embodiment of the generation method of leading symbol in a kind of physical frame of the present invention.
Embodiment
Inventor finds in current DVB_T2 standard and other standards, and leading symbol low complex degree receiving algorithm under frequency selective fading channels detects the problem occurring probability of failure.
For the problems referred to above, inventor, through research, provides the generation method of leading symbol in a kind of physical frame and the generation method of frequency-domain OFDM symbol, ensures that carrier frequency offset receiving terminal within the scope of-500kHz to 500kHz still can process Received signal strength.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
As shown in Figure 1 be the schematic flow sheet of the embodiment of the generation method of a kind of frequency-domain OFDM symbol of the present invention.With reference to figure 1, the generation method of frequency-domain OFDM symbol comprises the steps:
Step S11: generate fixed sequence program and signaling sequence respectively on frequency domain;
Step S12: fixed sequence program and signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence;
Step S13: fill null sequence subcarrier respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length.
Specifically, as described in step S11, frequency domain generates fixed sequence program and signaling sequence respectively.Wherein, described fixed sequence program comprises that receiving terminal can be used to do the relevant information of carrier frequency synchronization and Timing Synchronization, described signaling sequence comprises each basic transformation parameter.
In the present embodiment, described fixed sequence program is sequence of complex numbers, and in this sequence of complex numbers, the mould of each plural number is 1.Described signaling sequence is used for transmitting the information (such as various signaling) of P bit, has 2 pindividual possibility, often kind may be mapped to a length is the signaling sequence of M.Sequence set has 2 pindividual sequence, and uncorrelated each other, simultaneously also uncorrelated with known fixed sequence program.
As described in step S12, described fixed sequence program and signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence.
In one preferred embodiment, the length of described fixed sequence program is equal with the length of described signaling sequence, and this length is less than 1/2 of described predetermined length.Wherein, described predetermined length is 1024, but also can change according to system requirements in practical application.
For predetermined length for 1024, if the number that namely length of fixed sequence program is N(carries effective subcarrier of fixed sequence program is N), the length of signaling sequence be the number of effective subcarrier of M(and carrier signaling sequence is M), in the present embodiment, M=N.In other embodiments, N also can slightly larger than M.
The arrangement in oem character set between described fixed sequence program and signaling sequence, namely fixed sequence program is filled on even subcarrier (or strange subcarrier) position, correspondingly, signaling sequence is filled on strange subcarrier (or even subcarrier) position, thus on effective subcarrier of frequency domain, present the distribution of fixed sequence program and the arrangement of signaling sequence oem character set.It should be noted that, when the length of fixed sequence program and signaling sequence is inconsistent (such as M>N), fixed sequence program and the arrangement of signaling sequence oem character set can be realized by the mode of zero padding sequence subcarrier.
As described in step S13, fill null sequence subcarrier respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length.
In a preferred embodiment, this step comprises: fill the null sequence subcarrier of equal length respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length.
Along the G=1024-M-N in order to predetermined length being the example of 1024, the length of null sequence subcarrier, (1024-M-N)/2 null sequence subcarrier is filled in both sides.
Further, in order to ensure still can to process Received signal strength at carrier frequency offset receiving terminal within the scope of-500kHz to 500kHz, (1024-M-N) value of/2 is greater than critical length value (being set to TH) usually, and this critical length value is determined by system symbol rate and predetermined length.Such as,
Predetermined length is the system symbol rate of 1024,7.61M, the sample rate of 9.14M, then such as, M=N=350, then G=324,
162 null sequence subcarriers are respectively filled in both sides.
Therefore, subcarrier (the i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024) 0, P1_X 1..., P1_X 1023generate by filling with under type:
P 1 _ X i = 0 i = 0,1 , . . . , G / 2 - 1 FC ‾ i i = G / 2 , G / 2 + 2 , . . . G / 2 + 2 × ( N - 1 ) SC ‾ i i = G / 2 + 1 , G / 2 + 3 , G / 2 + 2 × ( M - 1 ) + 1 0 i = 1024 - G / 2 , . . . 1023
Wherein, residing odd even position can exchange.
As shown in Figure 2 be the frequency domain carriers distribution schematic diagram of the frequency-domain OFDM symbol utilizing the generation method of frequency-domain OFDM symbol of the present invention to generate.
Adopt the generation method of the frequency-domain OFDM symbol described in the embodiment of the present invention, for above-mentioned steps S11, inventor obtains a kind of embodiment generating the sequence of fixed sequence program and signaling on frequency domain through research.
Along in order to predetermined length be 1024, the example of the length of described fixed sequence program equal with the length of described signaling sequence (being all 350).
Particularly, described fixed sequence program is sequence of complex numbers, and in this sequence of complex numbers, the mould of each plural number is 1.Such as, in this sequence of complex numbers, the n-th plural number is , n=0,1 ... 349; Wherein, ω nvalue as shown in the table by rows from left to right in order:
4.12 1.71 1.17 5.09 5.77 4.96 2.94 4.86 0.46 2.17
1.68 5.97 3.97 4.56 4.59 2.41 5.46 6.01 2.13 3.70
2.71 3.70 4.46 5.98 3.71 2.36 5.37 3.93 0.92 5.68
0.52 1.18 1.12 2.65 0.73 1.44 1.43 3.71 5.70 2.20
3.60 4.21 5.48 5.28 5.19 6.15 1.91 0.30 5.84 2.14
5.47 4.23 3.84 5.76 4.25 4.22 4.24 2.42 3.46 1.73
5.78 0.78 0.08 2.22 2.76 2.10 2.77 4.21 2.95 2.28
1.98 4.29 2.85 0.27 2.88 6.10 1.57 2.32 0.56 4.09
0.45 5.18 0.16 5.62 2.62 1.29 6.23 5.97 3.17 4.33
0.49 2.42 3.88 2.45 4.66 3.58 1.76 0.46 3.64 5.08
2.12 4.36 2.81 5.40 2.16 3.10 0.58 4.89 0.92 2.97
3.78 6.03 4.15 1.53 1.17 4.24 0.14 4.03 5.57 1.80
2.66 4.84 4.23 4.65 1.52 3.68 0.26 5.86 1.25 4.36
5.48 5.85 0.84 0.14 1.43 1.02 4.26 1.88 0.54 5.78
0.96 0.74 3.14 2.88 5.88 1.14 5.86 1.54 4.69 1.31
5.92 5.65 3.97 4.98 3.53 5.87 1.04 2.14 1.73 2.17
5.43 0.65 1.94 6.05 5.09 6.02 2.21 3.93 2.32 0.30
1.69 5.96 0.38 0.47 1.21 0.74 6.08 5.11 2.36 3.06
4.18 0.59 2.27 2.62 3.56 1.15 5.21 4.92 2.22 1.60
6.11 4.06 0.48 5.19 4.69 5.54 6.00 2.38 3.14 4.72
2.87 0.86 2.82 1.17 1.43 6.14 5.15 4.07 0.15 4.07
0.92 0.62 4.47 4.57 2.61 5.72 2.78 2.49 2.58 3.54
4.24 0.42 2.44 3.79 0.64 1.44 3.38 3.61 0.46 4.15
4.90 4.25 1.92 5.61 3.38 0.44 3.28 5.47 4.82 5.24
2.32 3.64 3.00 6.16 2.16 1.62 2.23 3.06 5.41 3.59
2.57 4.09 6.00 2.58 5.97 6.11 2.19 1.57 1.83 3.83
5.81 2.80 3.95 3.00 5.72 2.37 3.62 3.12 5.09 2.60
2.04 2.94 0.17 0.45 5.80 1.41 2.25 0.11 1.74 3.47
1.20 1.12 3.99 4.04 2.58 0.58 4.90 1.47 2.93 2.09
5.78 3.49 2.13 4.56 0.91 4.58 0.20 2.56 3.81 3.92
6.08 5.32 2.24 2.80 5.45 4.14 0.42 0.44 2.16 2.45
2.38 0.71 4.14 2.29 4.77 5.11 3.21 3.50 6.11 6.10
3.12 3.53 0.30 3.98 4.10 3.15 1.44 0.26 3.64 0.33
5.62 6.26 4.73 2.11 3.08 0.01 0.48 2.94 4.29 5.56
5.38 0.58 5.57 2.68 5.08 6.26 5.88 3.54 2.11 4.43
Wherein, the first row is n is 0 ~ 9 corresponding ω nvalue, the second row be n be 10 ~ 19 corresponding ω nvalue, by that analogy, the 35th row is n is 340 ~ 349 corresponding ω nvalue.
Signaling sequence, is used for transmitting the information of P (such as P=8) bit, has 2 8individual possibility, often kind may be mapped to a length is the signaling sequence of 350.
Particularly, frequency domain generates signaling sequence to comprise the steps:
1) consensus sequence is generated;
2) cyclic shift is carried out to generate signaling sequence to this consensus sequence.
Wherein, described consensus sequence is part Zadoff-Chu sequence.Such as, this consensus sequence can be expressed as: z ( n ) = e - jπ · n ( n + 1 ) 353 ,n=0～349。
The signaling sequence generated after carrying out cyclic shift to described consensus sequence is expressed as: SC ‾ i = z ( k i - 1 ) , z ( k i ) , . . . , z ( 340 ) , z ( 0 ) , . . . , z ( k i - 2 ) , Wherein k ifor shift value, as shown in the table:
In other embodiments, can select 8 (corresponding P is 3) of transmitting in these 256 sequences, 16 (corresponding P is 4), 32 (corresponding P is 5), 64 (corresponding P is 6), the signaling of P the bit that 128 (corresponding P is 7) and 256 (corresponding P is 8) transmit to meet system requirements, and the value of P is less, and the papr (PAPR) of the sequence subset selected will be lower.
Finally, subcarrier (the i.e. frequency-domain OFDM symbol) P1_X of predetermined length (1024) 0, P1_X 1..., P1_X 1023generate by filling with under type:
P 1 _ X i = 0 i = 0,1 , . . . , 161 FC ‾ i i = 163,165,167 , . . . 861 SC ‾ i i = 162,164,166 , . . . 860 0 i = 862,863 , . . . 1023
Wherein odd even position of putting can exchange.
The embodiment of the present invention additionally provides the generation method of leading symbol in a kind of physical frame.As shown in Figure 3 be the schematic flow sheet of the embodiment of the generation method of leading symbol in a kind of physical frame of the present invention.With reference to figure 3, in physical frame, the generation method of leading symbol comprises the steps:
Step S21: the generation method according to above-mentioned frequency-domain OFDM symbol generates frequency-domain OFDM symbol;
Step S22: change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to described frequency-domain OFDM symbol;
Step S23: the modulation signal generating described time-domain OFDM symbol;
Step S24: generate leading symbol based on described time-domain OFDM symbol and this modulation signal.
It should be noted that, leading symbol can describe from time domain and frequency domain two territories.In the present embodiment, the generation method of leading symbol is on frequency domain, generate frequency-domain OFDM symbol, and generates the leading symbol in time domain based on the modulation signal of this frequency-domain OFDM symbol time-domain OFDM symbol corresponding with it.
Wherein, the embodiment of described step S21 with reference to the specific embodiment above described in Fig. 1, can not repeat them here.
As described in step S22, change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to described frequency-domain OFDM symbol.
It is conventional mode frequency-region signal being converted to time-domain signal that inverse discrete Fourier transform described in this step changes, and does not repeat them here.
P1_Xi obtains time-domain OFDM symbol after changing as inverse discrete Fourier transform:
P 1 _ A ( t ) = 1 M + N Σ i = 0 1023 P 1 _ X i e j 2 π ( i - 512 ) 1024 T t
As described in step S23, generate the modulation signal of described time-domain OFDM symbol.
In example A, this step comprises: 1) arrange a frequency displacement sequence; 2) described time-domain OFDM symbol is multiplied by this frequency displacement sequence to obtain the modulation signal of this time-domain OFDM symbol.
Such as, if this frequency displacement sequence is wherein f sH=1/ (1024T).M (t) also can be designed to other sequences, as m sequence or some simplify window sequence etc.
The modulation signal of time-domain OFDM symbol is P1_B (t); P1_B (t) is multiplied by frequency displacement sequence M (t) by P1_A (t) to obtain (i.e. P1_B (t)=P1_A (t) * M (t)), and is used as the protection interval of P1_A (t).
In example B, this step comprises: 1) arrange a frequency displacement sequence; 2) respectively the shift sequence of described time-domain OFDM symbol and this time-domain OFDM symbol is multiplied by this frequency displacement sequence to obtain the first modulation signal and second modulation signal of this time-domain OFDM symbol.
Such as, if this frequency displacement sequence is wherein f sH=1/ (1024T).M (t) also can be designed to other sequences, as m sequence or some simplify window sequence etc.
Described time-domain OFDM symbol is P1_A (t), and the shift sequence of this time-domain OFDM symbol is P1_A (t-1024T).
As described in step S24, generate leading symbol based on described time-domain OFDM symbol and this modulation signal.
In example A, this step comprises: using the protection interval of described modulation signal as described time-domain OFDM symbol, and is spliced in the front portion of described time-domain OFDM symbol to generate leading symbol.
Such as, leading symbol can generate according to formula below:
P 1 ( t ) = P 1 _ A ( t ) 0 ≤ t ≤ 1024 T P 1 _ B ( t ) 1024 T ≤ t ≤ 2048 T 0 otherwise
The length at protection interval also can be less than the length of time-domain OFDM symbol, if the length at protection interval is B_len, the length of time-domain OFDM symbol is A, and the front B_len part of getting A is modulated, that is:
P 1 ( t ) = P 1 _ A ( t ) 0 ≤ t ≤ 1024 T P 1 _ B ( t ) 1024 T ≤ t ≤ 1024 T + B _ lenT 0 otherwise
In example B, this step comprises: using described first modulation signal and the second modulation signal protection interval as described time-domain OFDM symbol, and the front and rear spliced respectively by these two modulation signals at described time-domain OFDM symbol is to generate leading symbol.
Such as, leading symbol can generate according to formula below:
P 1 ( t ) = P 1 _ A ( t ) e j 2 &pi; f SH t 0 &le; t &le; num 1 T P 1 _ A ( t - num 1 T ) num 1 T &le; t < ( 1024 + num 1 ) T P 1 _ A ( t - 1024 T ) e j 2 &pi; f SH t ( 1024 + num 1 ) T &le; t < 2048 T 0 otherwise
Wherein, num1 is the length of the modulation signal of splicing in the front portion of described time-domain OFDM symbol, and the value of num1 is less than described predetermined length (being 1024 in this example).Preferably, the value of num1 is 542.
In other embodiments, based on the generation method of the frequency-domain OFDM symbol that foregoing embodiments provides, those skilled in the art can adopt other execution modes (be not limited to step S22 to step S24) in Fig. 2 to process this frequency-domain OFDM symbol, to generate the leading symbol in time domain on this basis.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.

Claims (14)

1. a generation method for frequency-domain OFDM symbol, is characterized in that, comprise the steps:
Frequency domain generates fixed sequence program and signaling sequence respectively;
Fixed sequence program and signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence;
Null sequence subcarrier is filled respectively to form the frequency-domain OFDM symbol of predetermined length in described effective subcarrier both sides.
2. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterized in that, described fixed sequence program is sequence of complex numbers, and in this sequence of complex numbers, the mould of each plural number is 1.
3. the generation method of frequency-domain OFDM symbol as claimed in claim 2, it is characterized in that, in this sequence of complex numbers, the n-th plural number is , n=0,1 ... 349; Wherein, ω nvalue as shown in the table by rows from left to right in order:
4.12 1.71 1.17 5.09 5.77 4.96 2.94 4.86 0.46 2.17 1.68 5.97 3.97 4.56 4.59 2.41 5.46 6.01 2.13 3.70 2.71 3.70 4.46 5.98 3.71 2.36 5.37 3.93 0.92 5.68 0.52 1.18 1.12 2.65 0.73 1.44 1.43 3.71 5.70 2.20 3.60 4.21 5.48 5.28 5.19 6.15 1.91 0.30 5.84 2.14 5.47 4.23 3.84 5.76 4.25 4.22 4.24 2.42 3.46 1.73 5.78 0.78 0.08 2.22 2.76 2.10 2.77 4.21 2.95 2.28 1.98 4.29 2.85 0.27 2.88 6.10 1.57 2.32 0.56 4.09 0.45 5.18 0.16 5.62 2.62 1.29 6.23 5.97 3.17 4.33 0.49 2.42 3.88 2.45 4.66 3.58 1.76 0.46 3.64 5.08
2.12 4.36 2.81 5.40 2.16 3.10 0.58 4.89 0.92 2.97 3.78 6.03 4.15 1.53 1.17 4.24 0.14 4.03 5.57 1.80 2.66 4.84 4.23 4.65 1.52 3.68 0.26 5.86 1.25 4.36 5.48 5.85 0.84 0.14 1.43 1.02 4.26 1.88 0.54 5.78 0.96 0.74 3.14 2.88 5.88 1.14 5.86 1.54 4.69 1.31 5.92 5.65 3.97 4.98 3.53 5.87 1.04 2.14 1.73 2.17 5.43 0.65 1.94 6.05 5.09 6.02 2.21 3.93 2.32 0.30 1.69 5.96 0.38 0.47 1.21 0.74 6.08 5.11 2.36 3.06 4.18 0.59 2.27 2.62 3.56 1.15 5.21 4.92 2.22 1.60 6.11 4.06 0.48 5.19 4.69 5.54 6.00 2.38 3.14 4.72 2.87 0.86 2.82 1.17 1.43 6.14 5.15 4.07 0.15 4.07 0.92 0.62 4.47 4.57 2.61 5.72 2.78 2.49 2.58 3.54 4.24 0.42 2.44 3.79 0.64 1.44 3.38 3.61 0.46 4.15 4.90 4.25 1.92 5.61 3.38 0.44 3.28 5.47 4.82 5.24 2.32 3.64 3.00 6.16 2.16 1.62 2.23 3.06 5.41 3.59 2.57 4.09 6.00 2.58 5.97 6.11 2.19 1.57 1.83 3.83 5.81 2.80 3.95 3.00 5.72 2.37 3.62 3.12 5.09 2.60 2.04 2.94 0.17 0.45 5.80 1.41 2.25 0.11 1.74 3.47 1.20 1.12 3.99 4.04 2.58 0.58 4.90 1.47 2.93 2.09 5.78 3.49 2.13 4.56 0.91 4.58 0.20 2.56 3.81 3.92 6.08 5.32 2.24 2.80 5.45 4.14 0.42 0.44 2.16 2.45 2.38 0.71 4.14 2.29 4.77 5.11 3.21 3.50 6.11 6.10
3.12 3.53 0.30 3.98 4.10 3.15 1.44 0.26 3.64 0.33 5.62 6.26 4.73 2.11 3.08 0.01 0.48 2.94 4.29 5.56 5.38 0.58 5.57 2.68 5.08 6.26 5.88 3.54 2.11 4.43
4. the generation method of frequency-domain OFDM symbol as claimed in claim 1, is characterized in that,
Frequency domain generates signaling sequence comprise the steps:
Generate consensus sequence;
Cyclic shift is carried out to generate signaling sequence to this consensus sequence.
5. the generation method of frequency-domain OFDM symbol as claimed in claim 4, is characterized in that,
Described consensus sequence is expressed as: , n=0 ~ 349;
The signaling sequence generated after carrying out cyclic shift to described consensus sequence is expressed as:
SC i＝z(k i-1),z(k i),...,z(349),z(0),...,z(k i-2),i＝0～349，
Wherein k ifor shift value, as shown in the table:
6. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterized in that, the length of described fixed sequence program is equal with the length of described signaling sequence, and this length is less than 1/2 of described predetermined length.
7. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterized in that, fill null sequence subcarrier respectively in described effective subcarrier both sides and comprise with the frequency-domain OFDM symbol forming predetermined length: fill the null sequence subcarrier of equal length respectively in described effective subcarrier both sides to form the frequency-domain OFDM symbol of predetermined length.
8. the generation method of frequency-domain OFDM symbol as claimed in claim 7, is characterized in that, the length of the null sequence subcarrier that every side is filled is greater than critical length value, and this critical length value is determined by systematic sampling rate, symbol rate and predetermined length.
9. the generation method of frequency-domain OFDM symbol as claimed in claim 1, it is characterized in that, described predetermined length is 1024.
10. the generation method of leading symbol in physical frame, is characterized in that, comprise the steps:
Generation method according to frequency-domain OFDM symbol described in claim 1 generates frequency-domain OFDM symbol;
Change to obtain time-domain OFDM symbol as inverse discrete Fourier transform to described frequency-domain OFDM symbol;
Generate the modulation signal of described time-domain OFDM symbol;
Leading symbol is generated based on described time-domain OFDM symbol and this modulation signal.
The generation method of leading symbol in 11. physical frames as claimed in claim 10, it is characterized in that, the modulation signal of the described time-domain OFDM symbol of described generation comprises:
A frequency displacement sequence is set;
Described time-domain OFDM symbol is multiplied by this frequency displacement sequence to obtain the modulation signal of this time-domain OFDM symbol.
In 12. physical frames as claimed in claim 11, the generation method of leading symbol, is characterized in that, generates leading symbol refer to based on described time-domain OFDM symbol and this modulation signal:
Using the protection interval of described modulation signal as described time-domain OFDM symbol, and spliced in the front portion of described time-domain OFDM symbol to generate leading symbol.
The generation method of leading symbol in 13. physical frames as claimed in claim 10, it is characterized in that, the modulation signal of the described time-domain OFDM symbol of described generation comprises:
A frequency displacement sequence is set;
Respectively the shift sequence of described time-domain OFDM symbol and this time-domain OFDM symbol is multiplied by this frequency displacement sequence to obtain the first modulation signal and second modulation signal of this time-domain OFDM symbol.
In 14. physical frames as claimed in claim 13, the generation method of leading symbol, is characterized in that, generates leading symbol refer to based on described time-domain OFDM symbol and this modulation signal:
Using described first modulation signal and the second modulation signal protection interval as described time-domain OFDM symbol, and the front and rear spliced respectively by these two modulation signals at described time-domain OFDM symbol is to generate leading symbol.
CN201410153040.XA 2014-04-05 2014-04-16 The generation method of leading symbol and the generation method of frequency-domain OFDM symbol Active CN105007145B (en)

Priority Applications (42)

Application Number Priority Date Filing Date Title
CN201611014234.7A CN106685878A (en) 2014-04-16 2014-04-16 Generating method of leading symbol
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
CN201611199976.1A CN106998312B (en) 2014-04-16 2015-02-06 Preamble symbol receiving method
CA3212005A CA3212005A1 (en) 2014-04-16 2015-04-16 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
CA2945857A CA2945857C (en) 2014-04-16 2015-04-16 Preamble symbol receiving method and device
PCT/CN2015/076808 WO2015158292A1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
KR1020167032058A KR102033742B1 (en) 2014-04-16 2015-04-16 Method and apparatus for receiving preamble symbol
PCT/CN2015/076815 WO2015158296A1 (en) 2014-04-16 2015-04-16 Method and apparatus for receiving preamble symbol
US15/304,853 US10411929B2 (en) 2014-04-05 2015-04-16 Preamble symbol receiving method and device
CA2945858A CA2945858C (en) 2014-04-16 2015-04-16 Preamble symbol receiving method and device
KR1020197038044A KR102196222B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
PCT/CN2015/076813 WO2015158294A1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
US15/304,851 US11071072B2 (en) 2014-04-16 2015-04-16 Preamble symbol receiving method and device
KR1020167032059A KR102062221B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
KR1020167032055A KR102048221B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
PCT/CN2015/076814 WO2015158295A1 (en) 2014-04-16 2015-04-16 Method and apparatus for receiving preamble symbol
US15/304,856 US10574494B2 (en) 2014-04-16 2015-04-16 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
CA3211647A CA3211647A1 (en) 2014-04-16 2015-04-16 Preamble symbol receiving method and device
KR1020167032057A KR101975551B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
KR1020197033488A KR102191859B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
US15/304,857 US10148476B2 (en) 2014-04-05 2015-04-16 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
KR1020197012400A KR102108291B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
KR1020207036622A KR102347011B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
PCT/CN2015/076812 WO2015158293A1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
KR1020167032043A KR101974621B1 (en) 2014-04-16 2015-04-16 Method and apparatus for receiving preamble symbol
KR1020207035510A KR102234307B1 (en) 2014-04-16 2015-04-16 Method for generating preamble symbol, method for receiving preamble symbol, method for generating frequency domain symbol, and apparatuses
KR1020207014009A KR102223654B1 (en) 2014-04-16 2015-04-16 Method and apparatus for receiving preamble symbol
CA2945856A CA2945856C (en) 2014-04-16 2015-04-16 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
US15/304,854 US10778484B2 (en) 2014-04-16 2015-04-16 Preamble symbol transmitting method and device, and preamble symbol receiving method and device
CA2945855A CA2945855A1 (en) 2014-04-16 2015-04-16 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
CA2945854A CA2945854A1 (en) 2014-04-16 2015-04-16 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
KR1020197018441A KR102114352B1 (en) 2014-04-16 2015-04-16 Method and apparatus for receiving preamble symbol
US16/172,662 US11201770B2 (en) 2014-04-16 2018-10-26 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
US16/172,727 US11025465B2 (en) 2014-04-16 2018-10-27 Preamble symbol receiving method and device
US16/726,927 US11012275B2 (en) 2014-04-16 2019-12-26 Preamble symbol transmitting method and device
US16/726,928 US10958494B2 (en) 2014-04-16 2019-12-26 Preamble symbol receiving method and device
US16/992,041 US11088885B2 (en) 2014-04-16 2020-08-12 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
US16/992,039 US11082274B2 (en) 2014-04-16 2020-08-12 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
US16/992,040 US11128504B2 (en) 2014-04-16 2020-08-12 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
US16/992,038 US11088884B2 (en) 2014-04-16 2020-08-12 Preamble symbol generation and receiving method, and frequency-domain symbol generation method and device
US17/351,197 US11799706B2 (en) 2014-04-16 2021-06-17 Preamble symbol receiving method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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

Related Child Applications (2)

Application Number Title Priority Date Filing Date
CN201611015653.2A Division CN106878223A (en) 2014-04-16 2014-04-16 The generation method of frequency-domain OFDM symbol
CN201611014234.7A Division CN106685878A (en) 2014-04-16 2014-04-16 Generating method of leading symbol

Publications (2)

Publication Number Publication Date
CN105007145A true CN105007145A (en) 2015-10-28
CN105007145B CN105007145B (en) 2018-12-18

Family

ID=54379675

Family Applications (3)

Application Number Title Priority Date Filing Date
CN201611015653.2A Pending CN106878223A (en) 2014-04-16 2014-04-16 The generation method of frequency-domain OFDM symbol
CN201410153040.XA Active CN105007145B (en) 2014-04-05 2014-04-16 The generation method of leading symbol and the generation method of frequency-domain OFDM symbol
CN201611014234.7A Pending CN106685878A (en) 2014-04-16 2014-04-16 Generating method of leading symbol

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201611015653.2A Pending CN106878223A (en) 2014-04-16 2014-04-16 The generation method of frequency-domain OFDM symbol

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN201611014234.7A Pending CN106685878A (en) 2014-04-16 2014-04-16 Generating method of leading symbol

Country Status (1)

Country Link
CN (3) CN106878223A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN106453176A (en) * 2016-12-13 2017-02-22 中国联合网络通信集团有限公司 Frequency offset estimation method, device and system
US9762347B2 (en) 2014-08-25 2017-09-12 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame preamble
US9794958B2 (en) 2015-04-08 2017-10-17 ONE Media, LLC Advanced data cell resource mapping
US9853851B2 (en) 2014-08-07 2017-12-26 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US10033566B2 (en) 2014-08-07 2018-07-24 Coherent Logix, Incorporated Multi-portion radio transmissions
US10079708B2 (en) 2015-03-09 2018-09-18 ONE Media, LLC System discovery and signaling
US10560756B2 (en) 2012-11-28 2020-02-11 Sinclair Broadcast Group, Inc. Terrestrial broadcast market exchange network platform and broadcast augmentation channels for hybrid broadcasting in the internet age
US10652624B2 (en) 2016-04-07 2020-05-12 Sinclair Broadcast Group, Inc. Next generation terrestrial broadcasting platform aligned internet and towards emerging 5G network architectures

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104954309A (en) * 2014-03-28 2015-09-30 上海数字电视国家工程研究中心有限公司 Preamble symbol generation method and frequency domain OFDM symbol generation method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8885761B2 (en) * 2003-03-25 2014-11-11 Sony Corporation Data processing apparatus and method
KR100917201B1 (en) * 2007-12-11 2009-09-16 엘지전자 주식회사 Method of transmitting and receiving a signal and apparatus thereof
US8208522B2 (en) * 2008-03-07 2012-06-26 Nokia Corporation System and methods for receiving OFDM symbols having timing and frequency offsets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104954309A (en) * 2014-03-28 2015-09-30 上海数字电视国家工程研究中心有限公司 Preamble symbol generation method and frequency domain OFDM symbol generation method
CN106603456A (en) * 2014-03-28 2017-04-26 上海数字电视国家工程研究中心有限公司 Generation method of preamble symbol and generation method of frequency-domain OFDM symbol
CN106685877A (en) * 2014-03-28 2017-05-17 上海数字电视国家工程研究中心有限公司 Processing method of received signals of receiving end

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FANG YANG，ET AL.: "Robust Physical Layer Signaling Transmission over OFDM Systems", 《IEICE TRANSACTIONS ON COMMUNICATIONS》 *
TERO JOKELA，ET AL.: "Analysi of Physical Layer Signaling Transmission in DVB-T2 Systems", 《IEEE TRANSACTIONS ON BROADCASTING》 *

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10560756B2 (en) 2012-11-28 2020-02-11 Sinclair Broadcast Group, Inc. Terrestrial broadcast market exchange network platform and broadcast augmentation channels for hybrid broadcasting in the internet age
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
US11082277B2 (en) 2014-08-07 2021-08-03 Coherent Logix, Incorporated Multi-portion radio transmissions
US11588591B2 (en) 2014-08-07 2023-02-21 Sinclair Television Group, Inc Multi-portion radio transmissions
US10574500B2 (en) 2014-08-07 2020-02-25 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US9866421B2 (en) 2014-08-07 2018-01-09 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US10033566B2 (en) 2014-08-07 2018-07-24 Coherent Logix, Incorporated Multi-portion radio transmissions
US11855915B2 (en) 2014-08-07 2023-12-26 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US11838224B2 (en) 2014-08-07 2023-12-05 One Media , Llc Multi-portion radio transmissions
US9853851B2 (en) 2014-08-07 2017-12-26 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US10205619B2 (en) 2014-08-07 2019-02-12 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US10389569B2 (en) 2014-08-07 2019-08-20 Coherent Logix, Incorporated Multi-partition radio frames
US11146437B2 (en) 2014-08-07 2021-10-12 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame
US10560299B2 (en) 2014-08-07 2020-02-11 Coherent Logix, Incorporated Multi-portion radio transmissions
US11923966B2 (en) 2014-08-25 2024-03-05 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame preamble
US10833789B2 (en) 2014-08-25 2020-11-10 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame preamble
US9762347B2 (en) 2014-08-25 2017-09-12 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame preamble
US10630411B2 (en) 2014-08-25 2020-04-21 ONE Media, LLC Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame preamble
US10158518B2 (en) 2015-03-09 2018-12-18 One Media Llc System discovery and signaling
US11012282B2 (en) 2015-03-09 2021-05-18 ONE Media, LLC System discovery and signaling
US11627030B2 (en) 2015-03-09 2023-04-11 ONE Media, LLC System discovery and signaling
US10079708B2 (en) 2015-03-09 2018-09-18 ONE Media, LLC System discovery and signaling
US9794958B2 (en) 2015-04-08 2017-10-17 ONE Media, LLC Advanced data cell resource mapping
US10116973B2 (en) 2015-04-08 2018-10-30 ONE Media, LLC Advanced data cell resource mapping
US10602204B2 (en) 2015-04-08 2020-03-24 ONE Media, LLC Advanced data cell resource mapping
US10652624B2 (en) 2016-04-07 2020-05-12 Sinclair Broadcast Group, Inc. Next generation terrestrial broadcasting platform aligned internet and towards emerging 5G network architectures
CN106453176A (en) * 2016-12-13 2017-02-22 中国联合网络通信集团有限公司 Frequency offset estimation method, device and system
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

Also Published As

Publication number Publication date
CN106878223A (en) 2017-06-20
CN105007145B (en) 2018-12-18
CN106685878A (en) 2017-05-17

Similar Documents

Publication Publication Date Title
CN105007145A (en) Method for generating preamble symbol and method for generating frequency domain OFDM symbol
CN105007146A (en) Method for generating precursor symbol in physical frame
CN100556017C (en) In multi-input multi-output-orthogonal frequency-division multiplexing system for launching synchronously leading method
CN105282076A (en) Generation method of preamble symbols and generation method of frequency-domain OFDM symbols
EP2356788B1 (en) Unequal multipath protection of different frames within a superframe using different cyclic prefix lengths
CN105245479A (en) Physical frame preamble symbol receiving and processing method
CN105024791A (en) Generation method for preamble symbol in physical frame
CN105743624A (en) Generation method for preamble symbol and receiving method
CN105323048A (en) Generating method of preamble symbol in physical frame
CN105024963A (en) Frequency domain OFDM symbol generation method and preamble symbol generation method
CN105024952A (en) Frequency domain OFDM (orthogonal frequency division multiplexing) symbol generation method and preamble symbol generation method
CN106169984A (en) A kind of match tracing channel estimation methods being applicable to the reconstruct of DTMB external illuminators-based radar reference signal
US20170265202A1 (en) Time domain pilot of single-carrier mimo system and synchronization method thereof
CN104301275A (en) Pilot frequency position determination method based on pilot frequency interval optimization and transmitter-receiver device
CN104519006B (en) A kind of ofdm system phase noise elimination method transmitted based on cross polarization
CN102111359B (en) Maximum ratio channel equalization method of short wave (SW) multiple carrier-code division multiple access (MC-CDMA)
CN104253772A (en) Channel estimation method for orthogonal frequency division multiplexing system
CN104954309A (en) Preamble symbol generation method and frequency domain OFDM symbol generation method
EP2822191A1 (en) Transmitting apparatus, receiving apparatus, and control methods thereof
CN105141555A (en) System and method for performing channel estimation on an ofdm signal
CN103338166B (en) A kind of channel estimation methods of improvement
CN103001916B (en) Time domain reshaping method of orthogonal frequency division multiplexing (OFDM) communication system
CN105516031A (en) Channel estimation and channel equalization method of fast frequency hopping system
CN101540750B (en) Method for removing narrow pulse interference in OFDM system
CN103095627A (en) Orthogonal frequency division multiplexing (OFDM) technology system synchronization method and electronic device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: Room 1018, block B, No. three East Bridge Road, Pudong New Area, Shanghai, 200125, China

Applicant after: Shanghai NERC-DTV National Engineering Research Center Co., Ltd.

Address before: 200125 Shanghai East Road, Pudong New Area, No. three, No. 1018

Applicant before: Shanghai NERC-DTV National Engineering Research Center Co., Ltd.

COR Change of bibliographic data
GR01 Patent grant
GR01 Patent grant