CN105245479B - The receiving handling method of leading symbol in physical frame - Google Patents

The receiving handling method of leading symbol in physical frame Download PDF

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Publication number
CN105245479B
CN105245479B CN201410326504.2A CN201410326504A CN105245479B CN 105245479 B CN105245479 B CN 105245479B CN 201410326504 A CN201410326504 A CN 201410326504A CN 105245479 B CN105245479 B CN 105245479B
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leading symbol
symbol
signal
leading
physical frame
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CN105245479A (en
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张文军
黄戈
邢观斌
徐洪亮
何大治
管云峰
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Shanghai National Engineering Research Center of Digital Television Co Ltd
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Priority to CN201611186616.8A priority Critical patent/CN106685880A/en
Priority to CN201611174459.9A priority patent/CN107222444B/en
Priority to CN201910172245.5A priority patent/CN109743278B/en
Priority to CN201611169449.6A priority patent/CN107070831A/en
Priority to CN201410326504.2A priority patent/CN105245479B/en
Priority to CN201611199976.1A priority patent/CN106998312B/en
Priority to PCT/CN2015/076815 priority patent/WO2015158296A1/en
Priority to KR1020197012400A priority patent/KR102108291B1/en
Priority to KR1020167032059A priority patent/KR102062221B1/en
Priority to KR1020167032055A priority patent/KR102048221B1/en
Priority to US15/304,857 priority patent/US10148476B2/en
Priority to KR1020197033488A priority patent/KR102191859B1/en
Priority to CA2945854A priority patent/CA2945854A1/en
Priority to PCT/CN2015/076812 priority patent/WO2015158293A1/en
Priority to CA3212005A priority patent/CA3212005A1/en
Priority to US15/304,856 priority patent/US10574494B2/en
Priority to US15/304,853 priority patent/US10411929B2/en
Priority to US15/304,851 priority patent/US11071072B2/en
Priority to KR1020197038044A priority patent/KR102196222B1/en
Priority to CA2945857A priority patent/CA2945857C/en
Priority to CA2945856A priority patent/CA2945856C/en
Priority to KR1020167032058A priority patent/KR102033742B1/en
Priority to KR1020197018441A priority patent/KR102114352B1/en
Priority to KR1020207035510A priority patent/KR102234307B1/en
Priority to CA2945858A priority patent/CA2945858C/en
Priority to CA3211647A priority patent/CA3211647A1/en
Priority to US15/304,854 priority patent/US10778484B2/en
Priority to CA2945855A priority patent/CA2945855A1/en
Priority to PCT/CN2015/076808 priority patent/WO2015158292A1/en
Priority to PCT/CN2015/076814 priority patent/WO2015158295A1/en
Priority to KR1020167032057A priority patent/KR101975551B1/en
Priority to KR1020167032043A priority patent/KR101974621B1/en
Priority to KR1020207036622A priority patent/KR102347011B1/en
Priority to PCT/CN2015/076813 priority patent/WO2015158294A1/en
Priority to KR1020207014009A priority patent/KR102223654B1/en
Publication of CN105245479A publication Critical patent/CN105245479A/en
Priority to US16/172,662 priority patent/US11201770B2/en
Priority to US16/172,727 priority patent/US11025465B2/en
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Publication of CN105245479B publication Critical patent/CN105245479B/en
Priority to US16/726,927 priority patent/US11012275B2/en
Priority to US16/726,928 priority patent/US10958494B2/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 US16/992,040 priority patent/US11128504B2/en
Priority to US17/351,197 priority patent/US11799706B2/en
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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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • 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 receiving handling method of leading symbol in a kind of physical frame, including being handled to obtain baseband signal to the digital signal received；Judge in the baseband signal with the presence or absence of the received leading symbol of expectation, wherein the received leading symbol of expectation is based on time-domain OFDM symbol, and front has the spatial structure of modulated signal with cyclic prefix, the rear part；In the case where above-mentioned judging result, which is, is, determines position of the leading symbol in physical frame and solve signaling information entrained by the leading symbol.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 complex frequency Selective Fading Channel.

Description

The receiving handling method of leading symbol in physical frame
Technical field
The present invention relates to wireless broadcast communication technical field, in particular to the reception processing of leading symbol in a kind of physical frame Method.
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), only occur a P1 symbol in each physical frame or multiple P1 symbols continuously occur, it indicates The beginning of the physical frame.The purposes of P1 symbol includes:
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；
4) emergency alarm or broadcast system wake up.
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, in complex frequency Selective Fading Channel, such as when long multipath, DBPSK differential decoding may also can fail. Moreover, because there is no cyclic prefix in DVB_T2 spatial structure, if being combined with the frequency-domain structure for needing to carry out channel estimation, will make The problem of at its channel estimation in frequency domain performance degradation.
Summary of the invention
Problems solved by the invention is in current DVB_T2 standard and other standards, and leading symbol is in complex frequency selectivity There is the problem of probability of failure in the detection of low complex degree receiving algorithm under fading channel.
To solve the above problems, the embodiment of the invention provides a kind of receiving handling method of leading symbol in physical frame, Include the following steps: to handle to obtain baseband signal the digital signal received；Judge in the baseband signal whether In the presence of it is expected received leading symbol, wherein the received leading symbol of expectation be based on time-domain OFDM symbol, before Portion has the spatial structure of modulated signal with cyclic prefix, the rear part；In the case where above-mentioned judging result, which is, is, determining should Position of the leading symbol in physical frame simultaneously solves signaling information entrained by the leading symbol.
Compared with prior art, technical solution of the present invention has the advantages that
Judge that the baseband signal (obtaining after treatment to the physical frame received) received is received with the presence or absence of expectation Leading symbol, wherein leading symbol is based on time-domain OFDM symbol, and there is cyclic prefix, the rear part to have for front The spatial structure of modulated signal.And in the case where the judgment result is yes, position and solution of the leading symbol in physical frame are determined Signaling information entrained by the leading symbol out, thus the information of the instruction decoding subsequent data frame according to signaling information.
It ensure that using the modulated signal of time-domain OFDM symbol and the structure of time-domain OFDM symbol and utilize delay in receiving end The peak value that correlation may be significantly.Also, the modulated signal of time-domain OFDM symbol can be dry by continuous wave to avoid receiving end Disturb perhaps mono-tone interference perhaps occur with the isometric multipath channel of modulated signal length or receive signal in protection interval it is long There is error detection peak value when spending identical with the length of modulated signal.
Further, the corresponding frequency-domain OFDM symbol of time-domain OFDM symbol in leading symbol include: effective subcarrier and Null sequence subcarrier, wherein null sequence subcarrier is located at the two sides of effective subcarrier；Effective subcarrier includes that fixed sequence program carries Wave and signaling sequence subcarrier, and fixed sequence program subcarrier and the arrangement of signaling sequence subcarrier oem character set.It is specific in this way Frequency-domain structure design, wherein fixed sequence program can be used as the pilot tone in physical frame, consequently facilitating receiving end is to the object received Leading symbol is decoded demodulation in reason frame.
Detailed description of the invention
Fig. 1 is the CAB structural schematic diagram of leading symbol in a kind of physical frame of the invention；
Fig. 2 is a kind of CAB structural schematic diagram of the leading symbol of transmission signaling information of the invention；
Fig. 3 is that the process of the specific embodiment of the receiving handling method of leading symbol in a kind of physical frame of the invention is shown It is intended to.
Specific embodiment
Inventor has found in current DVB_T2 standard and other standards that leading symbol is in complex frequency Selective Fading Channel There is the problem of probability of failure in lower low complex degree receiving algorithm detection.
In view of the above-mentioned problems, inventor after study, provides the receiving handling method of leading symbol in physical frame.The party The characteristic of time domain waveform of the method based on leading symbol utilizes the modulated signal of time-domain OFDM symbol and the structure of time-domain OFDM symbol It ensure that and utilize the related peak value that may be significantly of delay in receiving end.Also, the modulated signal of time-domain OFDM symbol can be with Avoid receiving end by continuous wave CO_2 laser perhaps mono-tone interference or occur with the isometric multipath channel of modulated signal length, or Person, which receives when protection interval length is identical with the length of modulated signal in signal, there is error detection peak value.
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 CAB structural schematic diagram of leading symbol in a kind of physical frame of the invention as shown in Fig. 1.With reference to Fig. 1, A sections Indicate that time-domain OFDM symbol, C segment table show that cyclic prefix, B segment table show modulated signal.
Time-domain OFDM symbol is obtained after transmitting terminal makees inverse discrete fourier transform to frequency-domain OFDM symbol.For example, right P1_XiTime-domain OFDM symbol is obtained after making inverse discrete fourier transform:
Wherein, M is the number of effective non-zero sub-carriers.
The time-domain OFDM symbol of circulating prefix-length is intercepted as cyclic prefix, the circulation from the time-domain OFDM symbol Prefix length is equal to or less than the length of time-domain OFDM symbol.The determining circulating prefix-length is according to wireless broadcast communication System usually require confrontation multipalh length, system can be obtained in minimum threshold level the minimum length of robust correlation peak with And the bit number of spatial structure transmission signaling is any one or more of because usually determining.If only needing to transmit in frequency-domain structure Signaling, and spatial structure is fixed and is not necessarily to transmit signaling, then only needs to consider to need the multipalh length fought, system in minimum reception Can be obtained when thresholding one of minimum length of robust correlation peak or two.In general, the length of cyclic prefix is longer, it is right The performance of anti-long multipath is better, and the length of cyclic prefix and modulated signal length are longer, postpones relevant peak value and gets over robust. In general, the length of cyclic prefix and modulated signal length need to be more than or equal to system, to obtain robust in minimum threshold level related The minimum length of peak value.
The time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulated signal.
It in practical applications, can be by the way that a frequency deviation sequence be arranged, then by the time domain of the circulating prefix-length The time-domain OFDM symbol of OFDM symbol or the part circulating prefix-length is multiplied by the frequency deviation sequence to obtain the modulation Signal.
If NcpFor determining circulating prefix-length, LenBFor modulated signal length.
Frequency deviation sequence isWherein fSHIt can be chosen for the corresponding subcarrier in frequency domain of time-domain OFDM symbol It is spaced (i.e. 1/NAT), wherein T is sampling period, NAFor the length of time-domain OFDM symbol.In this example, NAIt is 1024, takes fSH =1/1024T.In other instances, in order to keep correlation peak sharp, fSHAlso it can choose as 1/ (LenBT).Work as LenB=NCP When, fSH=1/NCPT.Such as LenB=NCPWhen=512, fSH=1/512T.
In other embodiments, M (t) can also be designed to other sequences, such as m-sequence or the window sequence of some simplification Deng.
The modulated signal of the part time-domain OFDM symbol is P1_B (t), and P1_B (t) is by the part time-domain OFDM symbol It is obtained multiplied by frequency deviation sequence M (t), i.e. P1_B (t) are as follows:
Wherein, N1 is that selection is copied to modulated signal section The sampled point serial number of the corresponding time-domain OFDM symbol of starting point.
Modulated signal length can be obtained the minimum length of robust correlation peak in minimum threshold level by system to determine. Usual modulated signal length is more than or equal to the minimum length.If NAFor the length of time-domain OFDM symbol, if time-domain OFDM symbol Sampled point serial number 0,1 ... NA- 1. set N1 to select adopting for the corresponding time-domain OFDM symbol of starting point for being copied to modulated signal section Sample point number, N2 are the corresponding time-domain OFDM symbol sampled point serial number of terminal that selection is copied to modulated signal section.Wherein,
N2=N1+LenB-1
For ease of description, time-domain OFDM symbol is divided into 2 parts, first segment is the part not intercepted as cyclic prefix Time-domain OFDM symbol (the generally front of the time-domain OFDM symbol), second segment are part time domain of the interception as cyclic prefix OFDM symbol (the generally rear portion of the time-domain OFDM symbol).If interception time-domain OFDM symbol is all used as cyclic prefix, the One section of length is 0.N1 is centainly fallen in second segment, that is, is selected to the range of the part time-domain OFDM symbol of modulated signal section Range without departing from interception as the part time-domain OFDM symbol of cyclic prefix.
Modulated signal is only to have modulated frequency deviation or other signals, therefore it is related to cyclic prefix to can use modulated signal The correlation of value and modulated signal and time-domain OFDM symbol does Timing Synchronization and small inclined estimation.In practical applications, it modulates Signal length is generally without departing from the length of cyclic prefix part.Modulated signal can to avoid receiving end by continuous wave CO_2 laser or Mono-tone interference perhaps occurs and protection interval length and tune in the isometric multipath channel of modulated signal length or reception signal There is error detection peak value in the length of signal processed when identical.
As shown in Figure 1, using cyclic prefix splicing in the front of the time-domain OFDM symbol as protection interval, and will The modulated signal splicing generates the leading symbol of CAB structure as frequency modulation sequence at the rear portion of the OFDM symbol.
For example, leading symbol can be according to using following time-domain expression:
In a preferred embodiment, the predetermined length NA=1024；NcpFor the half of the predetermined length, that is, work as NA When=1024, Ncp=512.
Further, by generating different cyclic prefix and modulated signal, so that finally formed leading symbol Also different, so as to delay related operation can be made to it when leading symbol of the receiving end in the physical frame that demodulation receives, and According to the different delay of setting is attempted, wherein length of delay only has the design parameter for matching leading symbol, can just obtain apparent phase Peak value is closed, different leading symbols is distinguished with this, to achieve the purpose that spatial structure transmits signaling information in leading symbol.
The embodiment of the invention provides in a kind of time-domain OFDM symbol for intercepting circulating prefix-length, selection is different The time-domain OFDM symbol of initial position interception modulated signal length generate modulated signal so that finally formed leading symbol Signaling information is transmitted by the different initial position.
By taking the signaling information of transmission is emergency alarm or broadcast system identifies EAS_flag as an example.
For example, the length of the time-domain OFDM symbol is 1024, NCPFor 512+L, LenBFor 512-L, entire leading symbol Length be 2048, wherein frequency modulation value fSH=1/1024T, by selecting different initial position N1 to be used to transmit 1 bit Denoting signaling emergency alarm or broadcast system identify EAS_flag.
If EAS_flag=1, N1=512-L is taken, i.e., NAFor 1024 OFDM symbol correspondence serial number 512-L~ B is generated after the sampled point and frequency modulation sequence of 1023-2L, is put into the rear portion of A.
If EAS_flag=0, N1=512+L is taken, i.e., NAFor 1024 OFDM symbol correspondence serial number 512+L~ B is generated after 1023 sampled point and frequency modulation sequence, is put into the rear portion of A.
With reference to it is shown in Fig. 2 be another transmission emergency alarm or broadcast system mark EAS_flag leading symbol CAB structural schematic diagram.Wherein, the value of L is 8.
Time-domain expression are as follows:
If EAS_flag=1
If EAS_flag=0
In another example the predetermined length is 1024, NCPFor 512+15*L, LenBIt can use 512+i*L, 0≤i < for 512, N1 16, then can indicate 16 kinds it is different follow the example of, transmit 4bit signaling information.For example, different transmitters can be different by taking N1 come transmit the corresponding mark TXID of the transmitter, the same transmitter can also by timesharing change N1 send transmission Parameter.Preferably, L takes 16.
In another example the predetermined length is 1024, NCPFor 512+7*L, LenBIt can use 512+i*L, 0≤i < for 512, N1 7, transmit 3bit signaling information.Preferably, L takes 16.
It is the characteristic of the leading symbol of the generation method of leading symbol and CAB structure in the embodiment of the present invention above.It is connecing Receiving end can use the characteristic of above-mentioned leading symbol to judge the baseband signal received (to the physical frame received at Obtained after reason) with the presence or absence of desired received signal, and in the case where the judgment result is yes, determine leading symbol in physical frame In position and solve signaling information entrained by the leading symbol, thus according to the instruction decoding subsequent data frame of signaling information Information.
As shown in Fig. 3 in a kind of physical frame of the invention the receiving handling method of leading symbol specific embodiment Flow diagram.With reference to Fig. 3, receiving handling method includes the following steps:
Step S11: the physical frame received is handled to obtain baseband signal；
Step S12: judge in the baseband signal with the presence or absence of the received leading symbol of expectation, wherein the expectation connects The leading symbol of receipts be based on time-domain OFDM symbol, front with cyclic prefix, the rear part have modulated signal when Domain structure；
Step S13: in the case where above-mentioned judging result, which is, is, position and solution of the leading symbol in physical frame are determined Signaling information entrained by the leading symbol out.
As described in step S11, the physical frame received is handled to obtain baseband signal.Usual receiving end The signal received is analog signal, it is therefore desirable to carry out analog-to-digital conversion to it first to obtain digital signal, then be filtered, under Baseband signal is obtained after the processing such as sampling.It should be noted that if what receiving end received is intermediate-freuqncy signal, mould is being passed through to it It also needs to carry out frequency spectrum shift after number conversion process, is then filtered again, obtains baseband signal after the processing such as down-sampling.
As described in step S12, judge in the baseband signal with the presence or absence of the received leading symbol of expectation, wherein described It is expected that received leading symbol is based on time-domain OFDM symbol, front has modulation letter with cyclic prefix, the rear part Number spatial structure.
Specifically, firstly, with the presence or absence of the received leading character of expectation in the baseband signal that receiving end receives judgement Number, that is, whether the signal received meets reception standard, such as receiving end needs to receive the data of DVB_T2 standard, then needs to sentence Whether whether the signal that disconnecting receives be based on DVB_T2 standard (for example, having in the leading of DVB_T2 format in physical frame Symbol).
In the present embodiment, judge to include following step with the presence or absence of the received leading symbol of expectation in the baseband signal It is rapid:
Step S12A: according to cyclic prefix, time-domain OFDM symbol and the modulated signal it is expected in received leading symbol Delay relationship and frequency modulation relationship between any two carry out delay sliding correlation and demodulation frequency deviation to baseband signal, to obtain The related accumulated value of three delays；
Step S12B: postponing one, two or three in related accumulated value based on these three and perform mathematical calculations, and Peak detection is carried out to the absolute value of the mathematical operation result；
Step S12C: if the result of peak detection meets preset condition, it is determined that there is expectation in the baseband signal and connect The signal of receipts.
Specifically, with reference to foregoing embodiments, the time-domain expression of leading symbol are as follows:
Wherein, NAFor the length of time-domain OFDM symbol, NcpFor the length of cyclic prefix, N1 is that selection is copied to modulated signal The sampled point serial number of the corresponding time-domain OFDM symbol of starting point of section.Such as NAWhen=1024, Ncp=520, LenB=504, N1 are 504 or 520.
Due to it is expected that received leading symbol is based on time-domain OFDM symbol, front has cyclic prefix, thereafter Portion has the spatial structure of modulated signal.So receive in signal if comprising the expectation leading symbol, it includes one Or every multipath all has above structure in a plurality of multipath.
Delay relationship based on cyclic prefix and time-domain OFDM symbol will receive signal and carry out delay sliding correlation, prolong Slow associated expression U1(n) and postpone related accumulated value U1' (n) as follows:
U1(n)=r (n) r*(n-NA)
It may be selected to U1' (n) carry out energy normalized obtain U1s'(n)。
I.e.
Delay relationship and frequency modulation value based on modulated signal and cyclic prefix will receive signal and carry out delay sliding phase Frequency deviation is closed and demodulated, notices that it postpones associated expression U2(n) and postpone related accumulated value U2' (n) as follows:
It is same to may be selected to U2' (n) carry out energy normalized obtain U2s'(n)。
Delay relationship based on modulated signal and time-domain OFDM symbol and and frequency modulation value, signal will be received and postponed Sliding is related, postpones associated expression U3(n) and postpone related accumulated value U3' (n) as follows:
It is same to may be selected to U3' (n) carry out energy normalized obtain U3s'(n)。
Wherein, corr_len can use 1/fSHT to avoid continuous wave CO_2 laser or takes LenBSo that peak value is sharp.
Utilize the related accumulated value U of delay1'(n)、U2'(n)、U3' (n) perform mathematical calculations, such as U2'(n)·U3' * (n), Or U1'(n-NA+N1)·U2'(n)·U3'*(n) Lai Jinhang leading symbol captures, and judges in baseband signal with the presence or absence of expectation Received signal.
Such as NA=1024, Ncp=520, LenBWhen=504, N1=520,
Receiving signal delayed 1024 sampled points are carried out that sliding is related to tire out to obtain the first delay correlation to signal is received It is value added；
It is related to obtain that receiving signal delayed 1528 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear are subjected to sliding Two postpone related accumulated value；
It is related to obtain third that receiving signal delayed 504 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear are subjected to sliding Postpone related accumulated value.
For another example NA=1024, Ncp=512, LenBWhen=512, N1=512,
Receiving signal delayed 1024 sampled points are carried out that sliding is related to tire out to obtain the first delay correlation to signal is received It is value added；
It is related to obtain that receiving signal delayed 1536 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear are subjected to sliding Two postpone related accumulated value；
It is related to obtain third that receiving signal delayed 512 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear are subjected to sliding Postpone related accumulated value.
When leading symbol occurs, U2'(n)·U3'*(n) or U1'(n-NA+N1)·U2'(n)·U3'*(n) absolute Value will appear peak value.It therefore can be by U2'(n)·U3'*(n) or U1'(n-NA+N1)·U2'(n)·U3'*(n) or U after energy normalized2s'(n)·U3s'*(n) or U1s'(n-NA+N1)·U2s'(n)·U3s'*(n), using various peak values The algorithm of detection judges in baseband signal with the presence or absence of desired received signal.If the result of peak detection meets default item Part, it is determined that exist in the baseband signal and it is expected received leading symbol and expectation received signal.For example, with peak value maximum Value is compared with fixed threshold, is existed if being more than threshold value and it is expected received leading symbol and signal, is otherwise not present.
Determine that position of the leading symbol in physical frame includes: based on the peak value for meeting preset condition in the step S12 The result of detection determines position of the leading symbol in physical frame.
Specifically, received leading symbol it is expected if it exists, before determining according to the big part value of peak value or maximum value Lead the position that symbol occurs in physical frame.
Fractional part of frequency offset estimation can also be carried out using the result of peak detection, it can be by taking the big value of peak value by following 2 The value that kind method is calculated weights to obtain.
Method 1:
Wherein, NfRefer to the big points of the peak value for participating in statistics, expression takes how many a points on peak value to participate in operation, can also only take Maximum value is calculated.
Method 2:
Wherein, k, which takes, makes U1' (k) maximum absolute value point.
Further, since transmitting terminal can use N1 (i.e. in the time-domain OFDM symbol of interception modulated signal length Different initial positions) signaling information is transmitted, then, the received leading symbol of expectation has the property that
1) from the time-domain OFDM symbol of time-domain OFDM symbol interception circulating prefix-length as cyclic prefix；
2) time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulated signal；
Wherein, in the time-domain OFDM symbol for intercepting circulating prefix-length, different initial positions is selected to intercept modulation The time-domain OFDM symbol of signal length generates modulated signal, so that finally formed leading symbol passes through the different starting Signaling information is transmitted in position；
In this case, based on different initial positions, generate modulated signal several different and cyclic prefix and The delay relationship of modulated signal and time-domain OFDM symbol is judged received leading with the presence or absence of it is expected in the baseband signal with this Symbol.In the case where above-mentioned judging result, which is, is, position of the leading symbol in physical frame is determined.
According to modulated signal several different and cyclic prefix and the delay relationship of modulated signal and time-domain OFDM symbol, And then obtain several and postpone related accumulated value group, every group includes to baseband signal according to following in the received leading symbol of expectation Ring prefix, time-domain OFDM symbol and modulated signal delay relationship between any two and frequency modulation relationship carry out delay sliding phase Frequency deviation is closed and demodulates, to obtain the related accumulated values of three delays；
The related accumulated value of each one, two or three delay postponed in related accumulated value group is subjected to operation, and right The absolute value of the product calculation result carries out peak detection；
If the result of a certain group of peak detection meets preset condition, it is determined that it is received to there is expectation in the baseband signal Leading symbol.
For example, defining above-mentioned N1 is that certain fixes value when leading symbol transmits Q bit signalling using different N1 Delay sliding be related as one group.Every group includes the related accumulated value of above-mentioned 3 delays.Receiving end carries out 2 simultaneouslyQThe different N1 of kind take The above-mentioned delay relevant group of value, then from 2QA U2'(n)·U3'*(n) or U1'(n-NA+N1)·U2'(n)·U3'*(n) exhausted To in value, judging whether there is desired leading symbol.
If any one absolute value is all not above threshold value thresholding, show received there is no it is expected in baseband signal Signal.Such as with N1 be 504 or 520 identified to transmit 1 bit emergency alarm or broadcast system when, wherein N1=520 is expressed as Normal leading symbol, N1=504 are expressed as emergency alarm or broadcast system, then carry out 2 groups of above-mentioned delay relevant group.
That group that emergency alarm broadcast flag is 0, i.e. N1=520 take
To carry out sliding related to signal is received for receiving signal delayed 1024 sampled points；
It is related that receiving signal delayed 1528 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
It is related that receiving signal delayed 504 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
That group that emergency alarm broadcast flag is 1, i.e. N1=504 take
It is related that receiving signal delayed 1024 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
It is related that receiving signal delayed 1544 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
It is related that receiving signal delayed 520 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding.If N1=520's That group of maximum value is more than threshold value thresholding, then shows that baseband signal is desired signal, and leading symbol occurs, EAS_flag=0；Phase Instead, if that group of maximum value of N1=504 is more than threshold value thresholding, show EAS_flag=1；If 2 groups are all not above threshold value door Limit, then show that the baseband signal is not desired signal.
Signaling information entrained by the leading symbol is solved in the step S13 to include the following steps: to utilize leading symbol All or part of time domain waveform and/or all or part of time domain waveform of the leading symbol obtained after Fourier transformation Frequency-region signal, to solve signaling information entrained by the leading symbol.
Specifically, in this step, (time-domain OFDM symbol of modulated signal length is intercepted since transmitting terminal can use N1 In different initial positions) transmit signaling information, also can use in the corresponding frequency-domain OFDM symbol of time-domain OFDM symbol Signaling sequence subcarrier transmits signaling information.Therefore, receiving end will be based on the above two different side for transmitting signaling information Formula correspondingly solves signaling information, the specific implementation process is as follows:
Transmitting terminal transmits signaling information using N1:
As described above, receiving end can be in the case where being, to solve entrained by the leading symbol according to above-mentioned judging result Signaling information.If the result of a certain group of peak detection meets preset condition, the start bit of the corresponding modulated signal section of the group Setting corresponding signaling is to transmit signaling.
Transmitting terminal transmits signaling using the signaling sequence subcarrier in the corresponding frequency-domain OFDM symbol of time-domain OFDM symbol Information:
Specifically, the corresponding frequency-domain OFDM symbol of time-domain OFDM symbol includes: effective subcarrier and null sequence subcarrier, Middle null sequence subcarrier is located at the two sides of effective subcarrier；Effective subcarrier includes that fixed sequence program subcarrier and signaling sequence carry Wave, and fixed sequence program subcarrier and the arrangement of signaling sequence subcarrier oem character set.I.e. fixed sequence program is filled (or odd to even subcarrier Subcarrier) on position, correspondingly, signaling sequence is filled to odd subcarrier (or even subcarrier) position, thus having in frequency domain Imitate the distribution that fixed sequence program and the arrangement of signaling sequence oem character set are presented on subcarrier.And work as fixed sequence program and signaling sequence Length it is inconsistent when, can be realized by way of zero padding sequence subcarrier fixed sequence program and signaling sequence oem character set row Column.
Wherein, the generation method of signaling sequence and fixed sequence program, which may is that, selects one from all optional fixed sequence programs A fixed sequence program, and the signaling sequence set with good autocorrelation and cross correlation is generated, and be based on the fixed sequence program With OFDM symbol composed by signaling sequence any in signaling sequence set required by the satisfaction after inverse fourier transform Power PAR.
One specific embodiment is,
Fixed sequence program length is 353, amplitude 1, as following formula indicates:
Wherein, ωnValue it is as shown in the table by rows from left to right in order:
The number of signaling sequence is 512, and the signaling sequence set includes 4 signaling sequence subclass, each signaling It includes 128 signaling sequences that sequence subset, which closes, and the length L of signaling sequence is 353.
The generation formula method of signaling sequence:
Digit (the q of cyclic shifti,ki, i=0~2N- 1) wherein N=7 indicates that each signaling sequence subclass includes 128 A signaling sequence, altogether 4 subclass totally 512 signaling sequences；
Firstly, generating CAZAC sequence:
Then, cyclic shift is carried out to it:
si *(n)=[s (ki-1),s(ki),...,S(root-1),s(0),...,s(ki-1)]
Finally, intercepted length is the sequence of L since the head of above-mentioned sequence:
SCi(n)=si *(n), n=0~L-1
Obtained sequence SCiIt (n) is i-th required of signaling sequence.
R is the average power ratio of fixed sequence program and signaling sequence, is 1. in this example
1) the root value of first signaling sequence subclass is 353；
The value of q value is all numerical value in following table:
1 9 10 16 18 21 28 29 32 35 49 51 53 54 55
57 59 60 61 65 68 70 74 75 76 77 78 82 84 85
86 88 90 95 96 103 113 120 123 125 126 133 134 135 137
138 140 141 142 145 147 148 150 151 155 156 157 161 163 165
167 170 176 178 179 181 182 184 185 187 194 200 201 204 209
210 217 222 223 224 225 229 232 234 235 237 239 241 244 246
247 248 249 251 252 253 254 255 262 270 272 273 280 282 290
291 306 307 308 309 311 313 314 315 317 320 326 327 330 331
333 336 338 340 342 345 347 349
The digit of cyclic shift is all numerical value in following table:
105 244 172 249 280 251 293 234 178 11 63 217 83 111 282
57 85 134 190 190 99 180 38 191 22 254 186 308 178 251
277 261 44 271 265 298 328 282 155 284 303 113 315 299 166
342 133 115 225 13 26 326 148 195 145 185 121 58 162 118
151 182 230 39 249 305 309 144 188 181 265 140 212 137 10
298 122 281 181 267 178 187 177 352 4 353 269 38 342 288
277 88 124 120 162 204 174 294 166 157 56 334 110 183 131
171 166 321 96 37 261 155 34 149 156 267 332 93 348 300
245 101 186 117 329 352 215 55
2) the root value of second signaling sequence subclass is 367；
The value of q value is all numerical value in following table:
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80
119 120 121 123 140 142 151 154 162 166 171 184 186 188 190
191 193 194 195 198 203 204 207 208 209 210 211 212 214 215
219 220 221 222 223 224 226 228 230 232 233 235 236 237 239
240 241 243 245 249 250 252 254 257 259 260 261 262 263 264
265 266 267 269 271 272 273 275 276 277 278 281 282 283 284
285 286 289 294 297 299 302 303 306 307 310 311 312 313 314
316 317 321 322 323 326 327 329 331 332 334 338 340 342 344
345 347 349 351 356 361 363 366
The digit of cyclic shift is all numerical value in following table:
198 298 346 271 345 324 160 177 142 71 354 290 69 144 28
325 100 55 237 196 271 210 187 277 8 313 53 53 194 294
36 202 69 25 18 179 318 149 11 114 254 191 226 138 179
341 366 176 64 50 226 23 181 26 327 141 244 179 74 23
256 265 223 288 127 86 345 304 260 139 312 62 360 107 201
301 263 257 184 329 300 81 121 49 196 201 94 147 346 179
59 212 83 195 145 3 119 152 310 31 134 54 187 131 63
276 294 142 246 54 181 121 273 276 36 47 16 199 243 235
194 348 95 262 52 210 115 250
3) the root value of third signaling sequence subclass is 359；
The value of q value is all numerical value in following table:
1 3 5 6 9 12 14 22 29 30 32 34 60 63 65
67 72 74 76 78 83 84 87 88 89 90 91 92 94 95
96 99 112 115 123 124 128 137 141 143 145 149 152 153 154
155 159 164 165 169 175 179 183 186 187 188 189 192 197 199
201 202 203 211 215 219 220 221 223 226 227 228 229 230 234
237 238 239 243 246 248 249 250 252 254 257 258 261 262 273
274 280 282 284 286 288 290 297 298 300 303 308 309 310 312
313 314 317 318 319 320 321 322 323 324 326 333 334 335 336
339 341 342 344 349 351 352 355
The digit of cyclic shift is all numerical value in following table:
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20
18 226 165 320 339 352 316 241 336 119 166 258 273 302 275
46 26 259 330 206 46 10 308 165 195 314 330 208 148 275
15 214 251 8 27 264 169 128 207 21 246 14 291 345 114
306 179 109 336 322 149 270 253 207 152 26 190 128 137 196
268 36 40 253 29 264 153 221 341 116 24 55 60 171 25
100 202 37 93 115 174 239 148 170 37 328 37 253 237 355
39 288 225 223 140 163 145 264 75 29 282 252 270 30 262
271 305 122 78 27 127 92 6
4) the root value of the 4th signaling sequence subclass is 373；
The value of q value is all numerical value in following table:
26 28 29 34 38 40 43 49 54 57 58 62 64 65 79
80 81 83 85 86 87 101 102 187 189 190 191 193 194 195
196 198 199 200 202 204 205 206 208 209 211 213 214 216 217
218 219 220 221 222 223 224 225 227 228 230 232 233 236 237
241 243 245 246 247 248 249 250 251 252 253 255 256 259 260
261 262 263 265 266 267 275 276 280 282 283 284 285 289 295
297 300 301 302 303 305 307 317 320 322 323 325 327 328 332
338 341 342 343 348 349 351 352 353 355 356 357 358 359 360
361 362 363 364 367 369 370 372
The digit of cyclic shift is all numerical value in following table:
333 337 177 125 169 270 254 88 123 310 96 273 120 239 157
224 62 119 19 235 136 117 237 100 244 181 295 249 356 9
289 139 82 171 178 292 158 308 257 42 55 210 320 294 100
75 79 163 195 80 303 97 271 179 359 178 241 281 367 58
91 7 179 39 267 245 213 286 349 172 35 301 361 102 301
155 1 34 96 293 202 87 176 248 319 301 168 280 154 244
215 370 260 117 30 329 42 149 112 125 50 249 197 273 230
13 142 244 335 57 21 261 48 370 110 296 326 224 77 112
31 262 121 38 283 323 93 94
This 4 signaling sequence subclass are merged, signaling sequence t easet ofasubcarriers are obtained.
Therefore, it includes: by the inclusion of signaling sequence subcarrier that receiving end, which solves signaling information entrained by the leading symbol, Corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers time-domain signal of signal carry out operation, to solve The signaling information as entrained by signaling sequence subcarrier in the leading symbol.
Wherein, the signal comprising signaling sequence subcarrier includes: all or part of of the leading symbol received Time domain waveform, or the frequency-domain OFDM symbol obtained after being fourier transformed from interception time-domain OFDM symbol in leading symbol.Letter Enable sequence t easet ofasubcarriers be filled by signaling sequence each in signaling sequence set on effective subcarrier and the set that is formed.
Specifically, the N of corresponding ODFM symbol main body is interceptedAThe time-domain signal of length obtains frequency domain after carrying out Fourier transform OFDM symbol；Then, zero carrier is removed, the frequency domain signaling sub-carriers received are taken out according to signaling sub-carriers position.By its with Above-mentioned channel estimation value and known signaling sub-carriers collection carry out specific mathematical operation, complete frequency domain decoding function.
For example, setting i=0:M-1, M is signaling sub-carriers number, j=0:2P- 1, P, which are that frequency domain is transmitted, enables bit number, i.e., Corresponding signaling sub-carriers collection shares 2PA element, and each element corresponds to the sequence that length is M, HiFor each signaling sub-carriers pair The channel estimation value answered, SC_reciFor the frequency domain signaling sub-carriers value received,J-th of element is concentrated for signaling sub-carriers In i-th of value.ThenTake max (corrj) corresponding to j, Obtain the signaling information of frequency-domain transmission.
In other embodiments, the above process can also carry out in the time domain, using known signaling sub-carriers collection through in Fu Corresponding time domain signaling waveform collection is directly synchronized with the time-domain received signal for obtaining multipath accurate location after leaf inverse transformation Correlation takes correlation maximum absolute value that, can also solve the signaling information of frequency-domain transmission, which is not described herein again.
Further, receiving end can also do integer frequency offset estimation or channel estimation using fixed sequence program.
Specifically, the present embodiment further includes following steps: 1) according to determine leading symbol position in physical frame, Signal of the interception comprising fixed subcarrier；It 2) include the signal and frequency domain stator carrier wave sequence or the frequency for fixing subcarrier by this Stator carrier wave sequence corresponding time-domain signal in domain carries out operation, to obtain integer frequency offset estimation or channel estimation.
Wherein, the signal comprising fixed subcarrier includes: all or part of time domain of the leading symbol received Waveform, or the frequency-domain OFDM symbol obtained after being fourier transformed from interception time-domain OFDM symbol in leading symbol.
The two methods that receiving end carries out integer frequency offset estimation are detailed below.
Method 1:
According to position of the leading symbol detected in physical frame, the time domain waveform of the leading symbol received is intercepted All or part.By the way of frequency sweep, i.e., with fixed frequency variation step diameter (for example, between corresponding integer frequency offset Every), after the upper different frequency deviation of part time domain waveform modulation, obtain several time-domain signals:T is sampling period, fsFor sample frequency.And known frequency domain fixed sequence program It is A2 that carrier wave, which carries out the corresponding time-domain signal of inverse fourier transform, using A2 as known signal and each A1yIt is related to carry out sliding, Choose that A1 for maximum correlation peaks occury, then the frequency deviation value y modulated to it is integer frequency offset estimation value.
Wherein, the frequency deviation region fought required for swept frequency range correspondence system, for example, needing to fight the frequency of positive and negative 500K Partially, and systematic sampling rate be 9.14M, leading symbol main body be 1K length, then swept frequency range beI.e. [- 57, 57]。
Method 2:
Frequency-domain OFDM is obtained after corresponding to the time-domain signal progress Fourier transform of ODFM symbol main body in interception leading symbol The frequency-domain OFDM symbol that transformation obtains is carried out the cyclic shift of above-mentioned swept frequency range, and is multiplied every 2 difference by symbol, and with Known fixed sequence subcarrier carries out related operation every 2 difference multiplied values, obtains a series of correlations, chooses maximal correlation It is worth corresponding cyclic shift, can accordingly obtains available integer frequency offset estimation value.
Using the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier received and/or its into The corresponding time-domain signal of row inverse fourier transform completes channel estimation, equally can choose time domain carry out and/or frequency domain into Row, details are not described herein.
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 (23)

1. the receiving handling method of leading symbol in a kind of physical frame, which comprises the steps of:
The digital signal received is handled to obtain baseband signal；
Utilize the delay of cyclic prefix, time-domain OFDM symbol and the modulated signal it is expected in received leading symbol between any two Relationship and frequency modulation relationship carry out delay sliding correlation and/or demodulation frequency deviation to baseband signal, are based on postponing related accumulated value It performs mathematical calculations, is judged in the baseband signal based on peak detection with the presence or absence of the received leading symbol of expectation, wherein institute Stating the received leading symbol of expectation is based on time-domain OFDM symbol, and front has modulation with cyclic prefix, the rear part The spatial structure of signal；
In the case where above-mentioned judging result, which is, is, determines position of the leading symbol in physical frame and solve the leading symbol Entrained signaling information.
2. the receiving handling method of leading symbol in physical frame as described in claim 1, which is characterized in that judge the base band Include: with the presence or absence of the received leading symbol of expectation in signal
According to the delay of cyclic prefix, time-domain OFDM symbol and the modulated signal it is expected in received leading symbol between any two Relationship and frequency modulation relationship carry out delay sliding correlation and/or demodulation frequency deviation to baseband signal, related to obtain three delays Accumulated value；
Postpone one, two or three in related accumulated value based on these three to perform mathematical calculations, and to the operation result Absolute value carry out peak detection；
If the result of peak detection meets preset condition, it is determined that exist in the baseband signal and it is expected received leading symbol.
3. the receiving handling method of leading symbol in physical frame as claimed in claim 2, which is characterized in that determine leading symbol Position in physical frame includes:
Position of the leading symbol in physical frame is determined based on the result for the peak detection for meeting preset condition.
4. the receiving handling method of leading symbol in physical frame as described in claim 1, which is characterized in that solve the leading character Signaling information entrained by number includes the following steps:
Pass through Fu using all or part of time domain waveform of leading symbol and/or all or part of time domain waveform of the leading symbol In the frequency-region signal that obtains after leaf transformation, to solve signaling information entrained by the leading symbol.
5. the receiving handling method of leading symbol in physical frame as described in claim 1, which is characterized in that the expectation receives Leading symbol have the property that 1) from the time-domain OFDM symbol interception circulating prefix-length time-domain OFDM symbol conduct Cyclic prefix；2) time-domain OFDM symbol of the circulating prefix-length based on above-mentioned interception generates modulated signal；
Wherein, in the time-domain OFDM symbol for intercepting circulating prefix-length, different initial positions is selected to intercept modulated signal The time-domain OFDM symbol of length generates modulated signal, so that finally formed leading symbol passes through the different initial position To transmit signaling information；
Include: with the presence or absence of the received leading symbol of expectation in the judgement baseband signal
Based on different initial positions, modulated signal several different and cyclic prefix and modulated signal and time domain OFDM are generated The delay relationship of symbol is judged in the baseband signal with this with the presence or absence of the received leading symbol of expectation.
6. the receiving handling method of leading symbol in physical frame as claimed in claim 5, which is characterized in that
In the case where above-mentioned judging result, which is, is, determines position of the leading symbol in physical frame and solve the leading symbol Entrained signaling information.
7. the receiving handling method of leading symbol in physical frame as claimed in claim 5, which is characterized in that described based on difference Initial position, the delay for generating modulated signal several different and cyclic prefix and modulated signal and time-domain OFDM symbol closes System, to judge to include: with the presence or absence of the received leading symbol of expectation in the baseband signal
According to modulated signal several different and cyclic prefix and the delay relationship of modulated signal and time-domain OFDM symbol, in turn Obtain several and postpone related accumulated value group, every group include to baseband signal according to the circulation it is expected in received leading symbol before Sew, time-domain OFDM symbol and modulated signal delay relationship between any two and/or frequency modulation relationship carry out delay sliding phase Frequency deviation is closed and demodulates, to obtain the related accumulated values of three delays；
By the related accumulated value progress operation of each one, two or three delay postponed in related accumulated value group, and to being obtained The absolute value of the product calculation result obtained carries out peak detection；
If the result of a certain group of peak detection meets preset condition, it is determined that it is received leading to there is expectation in the baseband signal Symbol.
8. the receiving handling method of leading symbol in physical frame as claimed in claim 7, which is characterized in that
If the result of a certain group of peak detection meets preset condition, corresponding to the initial position of the corresponding modulated signal section of the group Signaling be transmit signaling information.
9. the receiving handling method of leading symbol in physical frame as described in claim 1, which is characterized in that the time domain OFDM The corresponding frequency-domain OFDM symbol of symbol includes:
Effective subcarrier and null sequence subcarrier, wherein null sequence subcarrier is located at the two sides of effective subcarrier；Effective subcarrier Including fixed sequence program subcarrier and signaling sequence subcarrier, and fixed sequence program subcarrier and signaling sequence subcarrier oem character set are arranged Column；
It is described to solve signaling information entrained by the leading symbol and include:
By the inclusion of the signal and signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers pair of signaling sequence subcarrier The time-domain signal answered carries out operation, to solve the signaling information as entrained by signaling sub-carriers in the leading symbol.
10. the receiving handling method of leading symbol in physical frame as described in claim 1, which is characterized in that further include as follows Step:
According to position of the leading symbol in physical frame is determined, interception includes the signal of fixed sequence program subcarrier；
The signal that this includes fixed sequence program subcarrier is carried with known frequency domain fixed sequence program subcarrier or frequency domain fixed sequence program The corresponding time-domain signal of wave carries out operation, to obtain integer frequency offset estimation or channel estimation.
11. the receiving handling method of leading symbol in physical frame as claimed in claim 10, which is characterized in that described comprising solid The signal of sequencing column subcarrier includes: all or part of time domain waveform of the leading symbol received, or from leading symbol The frequency-domain OFDM symbol that middle interception time-domain OFDM symbol obtains after being fourier transformed.
12. the receiving handling method of leading symbol in physical frame as claimed in claim 9, which is characterized in that described to include letter Enable sequence subcarrier signal include: the leading symbol received all or part of time domain waveform, or from leading symbol The frequency-domain OFDM symbol that middle interception time-domain OFDM symbol obtains after being fourier transformed.
13. the receiving handling method of leading symbol in physical frame as claimed in claim 10, which is characterized in that the integral multiple It is poor that the frequency-domain OFDM symbol that offset estimation is obtained after being fourier transformed based on interception time-domain OFDM symbol in leading symbol carries out Split-phase is closed and cyclic shift and known frequency domain fixed sequence program subcarrier to carry out difference related, and according to the result of the two into Row operation and obtain.
14. the receiving handling method of leading symbol in physical frame as claimed in claim 10, which is characterized in that the integral multiple Offset estimation is corresponding with known frequency domain fixed sequence program subcarrier in a manner of frequency sweep based on the time-domain OFDM symbol in leading symbol Time-domain signal operation and obtain.
15. the receiving handling method of leading symbol in physical frame as claimed in claim 9, which is characterized in that described to solve this Signaling information entrained by leading symbol includes:
The all or part of time domain waveform of leading symbol based on certain the multipath accurate location of acquisition received and known letter It enables the corresponding time-domain signal of sequence t easet ofasubcarriers synchronize related operation one by one, utilizes that of correlation maximum absolute value To solve corresponding signaling information.
16. the receiving handling method of leading symbol in physical frame as claimed in claim 9, which is characterized in that described to solve this Signaling information entrained by leading symbol includes:
The frequency-domain OFDM symbol and channel estimation obtained after being fourier transformed based on interception time-domain OFDM symbol in leading symbol Value and known signaling sequence subcarrier collection carry out conjugation and multiply accumulating mathematical operation, to solve in the leading symbol by signaling Signaling information entrained by carrier wave.
17. the receiving handling method of leading symbol in physical frame as claimed in claim 2, which is characterized in that described according to the phase Hope cyclic prefix, time-domain OFDM symbol and modulated signal in received leading symbol delay relationship between any two and/or Frequency modulation relationship, carrying out delay sliding correlation to baseband signal includes:
By receiving signal delayed 1024 sampled points, to carry out sliding related to obtain the first delay correlation accumulated value to signal is received；
Receiving signal delayed 1528 sampled points or 1536 sampled points the reception signal to the rear with JieDuHuaYu II Decoction are slided Correlation is to obtain the second delay correlation accumulated value；
Receiving signal delayed 504 sampled points or 512 sampled points the reception signal to the rear with JieDuHuaYu II Decoction are subjected to sliding phase It closes to obtain third and postpone related accumulated value.
18. the receiving handling method of leading symbol in physical frame as claimed in claim 7, which is characterized in that
Comprising the related accumulated value group of two delays, corresponding emergency alarm broadcast flag is 0 or is 1；
That group that emergency alarm broadcast flag is 0 takes following delay sliding relevant treatment:
To carry out sliding related to signal is received for receiving signal delayed 1024 sampled points；
It is related that receiving signal delayed 1528 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
It is related that receiving signal delayed 504 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
That group that emergency alarm broadcast flag is 1 takes following delay sliding relevant treatment:
It is related that receiving signal delayed 1024 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
It is related that receiving signal delayed 1544 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding；
It is related that receiving signal delayed 520 sampled points to the reception signal that JieDuHuaYu II Decoction is to the rear carry out sliding.
19. the receiving handling method of leading symbol in physical frame as claimed in claim 2, which is characterized in that
Peak detection is carried out based on value of the related accumulated value after mathematical operation is postponed, and big using peak maximum or peak value Several values carry out fractional part of frequency offset estimation.
20. the receiving handling method of leading symbol in physical frame as claimed in claim 10, which is characterized in that integer frequency offset For being the subcarrier spacing based on OFDM symbol.
21. the receiving handling method of leading symbol in physical frame as claimed in claim 19, which is characterized in that fractional part of frequency offset For being the subcarrier spacing based on OFDM symbol.
22. the receiving handling method of leading symbol in physical frame as claimed in claim 9, which is characterized in that the signaling sequence Column t easet ofasubcarriers are by following characteristic:
The number of signaling sequence is 512, and the signaling sequence t easet ofasubcarriers include 4 signaling sequence subclass, Mei Gexin Sequence subset is enabled to close comprising 128 signaling sequences, the length L of signaling sequence is 353；
The generation formula method of signaling sequence:
Digit (the q of cyclic shifti,ki, i=0~2N- 1) wherein N=7 indicates that each signaling sequence subclass includes 128 letters Sequence is enabled, altogether 4 subclass totally 512 signaling sequences；
Firstly, generating CAZAC sequence:
Then, cyclic shift is carried out to it:
si *(n)=[si(ki-1),si(ki),...,si(root-1),si(0),...,si(ki-1)]
Finally, intercepted length is the sequence of L since the head of above-mentioned sequence:
SCi(n)=si *(n), n=0~L-1
Obtained sequence SCiIt (n) is i-th required of signaling sequence；
R is the average power ratio of fixed sequence program and signaling sequence；
1) the root value of first signaling sequence subclass is 353；
The value of q value is all numerical value in following table:
1 9 10 16 18 21 28 29 32 35 49 51 53 54 55 57 59 60 61 65 68 70 74 75 76 77 78 82 84 85 86 88 90 95 96 103 113 120 123 125 126 133 134 135 137 138 140 141 142 145 147 148 150 151 155 156 157 161 163 165 167 170 176 178 179 181 182 184 185 187 194 200 201 204 209 210 217 222 223 224 225 229 232 234 235 237 239 241 244 246 247 248 249 251 252 253 254 255 262 270 272 273 280 282 290 291 306 307 308 309 311 313 314 315 317 320 326 327 330 331 333 336 338 340 342 345 347 349
The digit of cyclic shift is all numerical value in following table:
105 244 172 249 280 251 293 234 178 11 63 217 83 111 282 57 85 134 190 190 99 180 38 191 22 254 186 308 178 251 277 261 44 271 265 298 328 282 155 284 303 113 315 299 166 342 133 115 225 13 26 326 148 195 145 185 121 58 162 118 151 182 230 39 249 305 309 144 188 181 265 140 212 137 10 298 122 281 181 267 178 187 177 352 4 353 269 38 342 288 277 88 124 120 162 204 174 294 166 157 56 334 110 183 131 171 166 321 96 37 261 155 34 149 156 267 332 93 348 300 245 101 186 117 329 352 215 55
2) the root value of second signaling sequence subclass is 367；
The value of q value is all numerical value in following table:
8 9 10 15 19 21 31 34 39 49 58 59 71 76 80 119 120 121 123 140 142 151 154 162 166 171 184 186 188 190 191 193 194 195 198 203 204 207 208 209 210 211 212 214 215 219 220 221 222 223 224 226 228 230 232 233 235 236 237 239 240 241 243 245 249 250 252 254 257 259 260 261 262 263 264 265 266 267 269 271 272 273 275 276 277 278 281 282 283 284 285 286 289 294 297 299 302 303 306 307 310 311 312 313 314 316 317 321 322 323 326 327 329 331 332 334 338 340 342 344 345 347 349 351 356 361 363 366
The digit of cyclic shift is all numerical value in following table:
198 298 346 271 345 324 160 177 142 71 354 290 69 144 28 325 100 55 237 196 271 210 187 277 8 313 53 53 194 294 36 202 69 25 18 179 318 149 11 114 254 191 226 138 179 341 366 176 64 50 226 23 181 26 327 141 244 179 74 23 256 265 223 288 127 86 345 304 260 139 312 62 360 107 201 301 263 257 184 329 300 81 121 49 196 201 94 147 346 179 59 212 83 195 145 3 119 152 310 31 134 54 187 131 63 276 294 142 246 54 181 121 273 276 36 47 16 199 243 235 194 348 95 262 52 210 115 250
3) the root value of third signaling sequence subclass is 359；
The value of q value is all numerical value in following table:
The digit of cyclic shift is all numerical value in following table:
300 287 80 119 68 330 93 359 17 93 355 308 106 224 20 18 226 165 320 339 352 316 241 336 119 166 258 273 302 275 46 26 259 330 206 46 10 308 165 195 314 330 208 148 275 15 214 251 8 27 264 169 128 207 21 246 14 291 345 114 306 179 109 336 322 149 270 253 207 152 26 190 128 137 196 268 36 40 253 29 264 153 221 341 116 24 55 60 171 25 100 202 37 93 115 174 239 148 170 37 328 37 253 237 355 39 288 225 223 140 163 145 264 75 29 282 252 270 30 262 271 305 122 78 27 127 92 6
4) the root value of the 4th signaling sequence subclass is 373；
The value of q value is all numerical value in following table:
26 28 29 34 38 40 43 49 54 57 58 62 64 65 79 80 81 83 85 86 87 101 102 187 189 190 191 193 194 195 196 198 199 200 202 204 205 206 208 209 211 213 214 216 217 218 219 220 221 222 223 224 225 227 228 230 232 233 236 237 241 243 245 246 247 248 249 250 251 252 253 255 256 259 260 261 262 263 265 266 267 275 276 280 282 283 284 285 289 295 297 300 301 302 303 305 307 317 320 322 323 325 327 328 332 338 341 342 343 348 349 351 352 353 355 356 357 358 359 360 361 362 363 364 367 369 370 372
The digit of cyclic shift is all numerical value in following table:
This 4 signaling sequence subclass are merged, signaling sequence t easet ofasubcarriers are obtained.
23. the receiving handling method of leading symbol in physical frame as claimed in claim 10, which is characterized in that the fixed sequence Column t easet ofasubcarriers are by following characteristic:
Fixed sequence program length is 353, amplitude 1, as following formula indicates:
Wherein, ωnValue it is as shown in the table by rows from left to right in order:
5.43 2.56 0.71 0.06 2.72 0.77 1.49 6.06 4.82 2.10 5.62 4.96 4.93 4.84 4.67 5.86 5.74 3.54 2.50 3.75 0.86 1.44 3.83 4.08 5.83 1.47 0.77 1.29 0.16 1.38 4.38 2.52 3.42 3.46 4.39 0.61 4.02 1.26 2.93 3.84 3.81 6.21 3.80 0.69 5.80 4.28 1.73 3.34 3.08 5.85 1.39 0.25 1.28 5.14 5.54 2.38 6.20 3.05 4.37 5.41 2.23 0.49 5.12 6.26 3.00 2.60 3.89 5.47 4.83 4.17 3.36 2.63 3.94 5.13 3.71 5.89 0.94 1.38 1.88 0.13 0.27 4.90 4.89 5.50 3.02 1.94 2.93 6.12 5.47 6.04 1.14 5.52 2.01 1.08 2.79 0.74 2.30 0.85 0.58 2.25 5.25 0.23 6.01 2.66 2.48 2.79 4.06 1.09 2.48 2.39 5.39 0.61 6.25 2.62 5.36 3.10 1.56 0.91 0.08 2.52 5.53 3.62 2.90 5.64 3.18 2.36 2.08 6.00 2.69 1.35 5.39 3.54 2.01 4.88 3.08 0.76 2.13 3.26 2.28 1.32 5.00 3.74 1.82 5.78 2.28 2.44 4.57 1.48 2.48 1.52 2.70 5.61 3.06 1.07 4.54 4.10 0.09 2.11 0.10 3.18 3.42 2.10 3.50 4.65 2.18 1.77 4.72 5.71 1.48 2.50 4.89 4.04 6.12 4.28 1.08 2.90 0.24 4.02 1.29 3.61 4.36 6.00 2.45 5.49 1.02 0.85 5.58 2.43 0.83 0.65 1.95 0.79 5.45 1.94 0.31 0.12 3.25 3.75 2.35 0.73 0.20 6.05 2.98 4.70 0.69 5.97 0.92 2.65 4.17 5.71 1.54 2.84 0.98 1.47 6.18 4.52 4.44 0.44 1.62 6.09 5.86 2.74 3.27 3.28 0.55 5.46 0.24 5.12 3.09 4.66 4.78 0.39 1.63 1.20 5.26 0.92 5.98 0.78 1.79 0.75 4.45 1.41 2.56 2.55 1.79 2.54 5.88 1.52 5.04 1.53 5.53 5.93 5.36 5.17 0.99 2.07 3.57 3.67 2.61 1.72 2.83 0.86 3.16 0.55 5.99 2.06 1.90 0.60 0.05 4.01 6.15 0.10 0.26 2.89 3.12 3.14 0.11 0.11 3.97 5.15 4.38 2.08 1.27 1.17 0.42 3.47 3.86 2.17 5.07 5.33 2.63 3.20 3.39 3.21 4.58 4.66 2.69 4.67 2.35 2.44 0.46 4.26 3.63 2.62 3.35 0.84 3.89 4.17 1.77 1.47 2.03 0.88 1.93 0.80 3.94 4.70 6.12 4.27 0.31 4.85 0.27 0.51 2.70 1.69 2.18 1.95 0.02 1.91 3.13 2.27 5.39 5.45 5.45 1.39 2.85 1.41 0.36 4.34 2.44 1.60 5.70 2.60 3.41 1.84 5.79 0.69 2.59 1.14 5.28 3.72 5.55 4.92 2.64
。
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