CN107070831A - The receiving handling method of leading symbol in physical frame - Google Patents
The receiving handling method of leading symbol in physical frame Download PDFInfo
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- CN107070831A CN107070831A CN201611169449.6A CN201611169449A CN107070831A CN 107070831 A CN107070831 A CN 107070831A CN 201611169449 A CN201611169449 A CN 201611169449A CN 107070831 A CN107070831 A CN 107070831A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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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
Abstract
The invention provides a kind of receiving handling method of leading symbol in physical frame, including to being handled the data signal received to obtain baseband signal；Judge with the presence or absence of the leading symbol for expecting to receive in the baseband signal, wherein, the leading symbol for expecting to receive is that, based on time-domain OFDM symbol, its front portion has the spatial structure of modulated signal with cyclic prefix, its rear portion；In above-mentioned judged result in the case of being, determine position of the leading symbol in physical frame and solve the signaling information entrained by the leading symbol, the technical program is solved in current DVB_T2 standards and other standards, and leading symbol low complex degree receiving algorithm under complex frequency Selective Fading Channel detects the problem of probability of failure occur.
Description
The application is the divisional application of original bill, the application number 201410326504.2 of original bill, July 10 2014 applying date
Day, invention and created name《The receiving handling method of leading symbol in physical frame》.
Technical field
The present invention relates to wireless broadcast communication technical field, the reception processing of leading symbol in more particularly to a kind of physical frame
Method.
Background technology
The data transmitted by transmitting terminal are correctly demodulated generally for the receiving terminal for enabling ofdm system, ofdm system is necessary
Realize between transmitting terminal and receiving terminal accurately and reliably time synchronized.Simultaneously as ofdm system is very quick to the frequency deviation of carrier wave
Sense, the receiving terminal of ofdm system it is also required to provide the carrier spectrum method of estimation of precise and high efficiency, accurate to be carried out to carrier wave frequency deviation
Estimation and correction.
At present, realize the transmitting terminal method synchronous with destination time substantially based on leading symbol come real in ofdm system
Existing.Leading symbol is all known symbol sebolic addressing of transmitting terminal and receiving terminal of ofdm system, and leading symbol is as physical frame
Start (being named as P1 symbols), only occur a P1 symbol in each physical frame or multiple P1 symbols continuously occur, it indicates
The beginning of the physical frame.The purposes of P1 symbols includes：
1) whether make receiving terminal rapidly detect to determine to transmit in channel is the signal for expecting to receive；
2) basic configured transmission (such as FFT points, frame type information) is provided so that receiving terminal can carry out after continued access
Receipts processing；
3) original carrier frequency deviation and timing error are detected, frequency and Timing Synchronization are reached after compensating；
4) emergency alarm or broadcast system wake up.
The P1 Design of Symbols based on CAB spatial structures is proposed in DVB_T2 standards, above-mentioned functions are preferably realized.But
It is still to have some limitations on low complex degree receiving algorithm.For example, 1024, the long multipath letter of 542 or 482 symbols
During road, being timed using CAB structures slightly synchronously can occur relatively large deviation, cause to estimate that carrier wave integer frequency offset occurs on frequency domain
Mistake.In addition, in complex frequency Selective Fading Channel, such as during long multipath, DBPSK differential decodings be able to may also fail.
Being additionally, since in DVB_T2 spatial structures does not have cyclic prefix, and if need carry out channel estimation frequency-domain structure combination, will make
The problem of into its channel estimation in frequency domain performance degradation.
The content of the invention
During the problem of present invention is solved is current DVB_T2 standards and other standards, leading symbol is in complex frequency selectivity
The problem of there is probability of failure in the detection of low complex degree receiving algorithm under fading channel.
To solve the above problems, the embodiments of the invention provide a kind of receiving handling method of leading symbol in physical frame,
Comprise the following steps：The data signal received is handled to obtain baseband signal；Judge in the baseband signal whether
In the presence of the leading symbol for expecting to receive, wherein, the leading symbol for expecting to receive is based on time-domain OFDM symbol, before it
There is cyclic prefix, its rear portion to have the spatial structure of modulated signal in portion；In the case where above-mentioned judged result is to be, it is determined that should
Position of the leading symbol in physical frame simultaneously solves the 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 (being obtained after treatment to the physical frame received) received is received with the presence or absence of expectation
Leading symbol, wherein, leading symbol is that, based on time-domain OFDM symbol, there is cyclic prefix, its rear portion to have for its front portion
The spatial structure of modulated signal.And in the case where the judgment result is yes, determine position and solution of the leading symbol in physical frame
Go out the signaling information entrained by the leading symbol, so that 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 terminal
The peak value that correlation may be significantly.Also, the modulated signal of time-domain OFDM symbol can avoid receiving terminal dry by continuous wave
Disturb either mono-tone interference or occur long with protection interval in the isometric multipath channel of modulated signal length, or reception signal
There is error detection peak value when identical with the length of modulated signal in degree.
Further, the corresponding frequency-domain OFDM symbol of time-domain OFDM symbol in leading symbol includes：Effective subcarrier and
Null sequence subcarrier, wherein null sequence subcarrier are located at the both sides of effective subcarrier；Effective subcarrier includes fixed sequence program and carried
Ripple and signaling sequence subcarrier, and fixed sequence program subcarrier and the arrangement of signaling sequence subcarrier oem character set.By so specific
Frequency-domain structure design, wherein fixed sequence program can be as the pilot tone in physical frame, consequently facilitating receiving terminal is to the thing that receives
Manage leading symbol in frame and carry out decoding demodulation.
Brief description of the drawings
Fig. 1 is the CAB structural representations of leading symbol in a kind of physical frame of the invention；
Fig. 2 is a kind of CAB structural representations of the leading symbol of transmission signaling information of the present invention；
Fig. 3 is that the flow of the embodiment of the receiving handling method of leading symbol in a kind of physical frame of the invention is shown
It is intended to.
Embodiment
Inventor has found in current DVB_T2 standards and other standards that leading symbol is in complex frequency Selective Fading Channel
The problem of there is probability of failure in lower low complex degree receiving algorithm detection.
In view of the above-mentioned problems, inventor is by research, there is provided 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 and the structure of time-domain OFDM symbol of time-domain OFDM symbol
It ensure that and utilize the related peak value that may be significantly of delay in receiving terminal.Also, the modulated signal of time-domain OFDM symbol can be with
Avoid receiving terminal by continuous wave CO_2 laser either mono-tone interference or occur with the isometric multipath channel of modulated signal length, or
Person, which is received when protection interval length is identical with the length of modulated signal in signal, there is error detection peak value.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
As shown in Fig. 1 in a kind of physical frame of the invention leading symbol CAB structural representations.With reference to Fig. 1, A sections
Time-domain OFDM symbol is represented, C segment tables show cyclic prefix, and B segment tables show modulated signal.
Time-domain OFDM symbol is that transmitting terminal is made to obtain after inverse discrete fourier transform to frequency-domain OFDM symbol.For example, right
P1_XiMake to obtain time-domain OFDM symbol after inverse discrete fourier transform：
Wherein, M is the number of effective non-zero sub-carriers.
Time-domain OFDM symbol from time-domain OFDM symbol interception circulating prefix-length is as cyclic prefix, the circulation
Prefix length is equal to or less than the length of time-domain OFDM symbol.The determination 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 spatial structure transmits any of bit number of signaling or many factors to determine.If only needing to transmit in frequency-domain structure
Signaling, and spatial structure is fixed and need not transmit signaling, then only needs to consider to need the multipalh length resisted, system to receive minimum
Can be obtained during thresholding one of minimum length of robust correlation peak or two.Generally, the length of cyclic prefix is longer, right
The performance of anti-long multipath is better, and the length and modulated signal length of cyclic prefix are longer, and it postpones related peak value and gets over robust.
Generally, 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 generation modulated signal of the circulating prefix-length based on above-mentioned interception.
In actual applications, can be by setting a frequency deviation sequence, 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 the circulating prefix-length of determination, LenBFor modulated signal length.
Frequency deviation sequence isWherein fSHThe corresponding subcarrier in frequency domain of time-domain OFDM symbol can be chosen for
It is spaced (i.e. 1/NAT), wherein T is sampling period, NAFor the length of time-domain OFDM symbol.In this example, NAFor 1024, f is takenSH
=1/1024T.In other instances, in order that correlation peak is sharp, fSHIt can also select 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 some window sequences simplified
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 multiplied by frequency deviation sequence M (t) to obtain, i.e., P1_B (t) is：
Wherein, N1 is copied to modulated signal section for selection
The sampled point sequence number of the corresponding time-domain OFDM symbol of starting point.
Modulated signal length is determined by system can obtain the minimum length of robust correlation peak in minimum threshold level.
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., which set N1, is copied to the starting point corresponding time-domain OFDM symbol of modulated signal section as selection and adopts
Sample point number, N2 is copied to the corresponding time-domain OFDM symbol sampled point sequence number of terminal of modulated signal section for selection.Wherein,
N2=N1+LenB-1
For the ease of description, time-domain OFDM symbol is divided into 2 parts, first paragraph is not intercept the part as cyclic prefix
Time-domain OFDM symbol (the generally front portion of the time-domain OFDM symbol), second segment is part time domain of the interception as cyclic prefix
OFDM symbol (the generally rear portion of the time-domain OFDM symbol).If intercepting time-domain OFDM symbol all as cyclic prefix, the
One section of length is 0.N1 necessarily falls in second segment, that is, selects the scope of the part time-domain OFDM symbol to modulated signal section
Without departing from scope of the interception as the part time-domain OFDM symbol of cyclic prefix.
Modulated signal is only to have modulated frequency deviation or other signals, therefore can be related to cyclic prefix using modulated signal
The correlation of value and modulated signal and time-domain OFDM symbol does Timing Synchronization and small inclined estimation.In actual applications, modulate
The general length without departing from cyclic prefix part of signal length.Modulated signal receiving terminal can be avoided by continuous wave CO_2 laser or
Mono-tone interference, either 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, the cyclic prefix is spliced in the anterior as protection interval of the time-domain OFDM symbol, and will
Modulated signal splicing is at the rear portion of the OFDM symbol as frequency modulation sequence to generate the leading symbol of CAB structures.
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 the leading symbol ultimately formed
Also it is different, so as to during leading symbol of the receiving terminal in the physical frame that demodulation is received, delay related operation can be made to it, and
The delays different according to setting is attempted, wherein length of delay only have the design parameter of matching leading symbol, can just obtain obvious phase
Peak value is closed, different leading symbols are distinguished with this, to reach the purpose of the spatial structure transmission signaling information in leading symbol.
The embodiments of the invention provide a kind of in the time-domain OFDM symbol for intercepting circulating prefix-length, selection is different
The time-domain OFDM symbol of original position interception modulated signal length produce modulated signal so that the leading symbol ultimately formed
Signaling information is transmitted by the different original position.
So that the signaling information of transmission is emergency alarm or broadcast system mark EAS_flag as an example.
For example, the length of the time-domain OFDM symbol is 1024, NCPFor 512+L, LenBFor 512-L, whole leading symbol
Length be 2048, wherein frequency modulation value fSH=1/1024T, by selecting different original position N1 to be used for transmitting 1 bit
Denoting signaling emergency alarm or broadcast system mark EAS_flag.
If EAS_flag=1, N1=512-L is taken, i.e., NAFor 1024 OFDM symbol corresponding serial number 512-L~
B is generated after 1023-2L sampled point and frequency modulation sequence, A rear portion is put into.
If EAS_flag=0, N1=512+L is taken, i.e., NAFor 1024 OFDM symbol corresponding serial number 512+L~
B is generated after 1023 sampled point and frequency modulation sequence, A rear portion is put into.
With reference to shown in Fig. 2 is the leading symbol that another transmission emergency alarm or broadcast system identify EAS_flag
CAB structural representations.Wherein, L value is 8.
Time-domain expression is：
If EAS_flag=1
If EAS_flag=0
In another example, the predetermined length is 1024, NCPFor 512+15*L, LenB512+i*L, 0≤i ＜ are can use for 512, N1
16, then can represent 16 kinds it is different follow the example of, transmit 4bit signaling informations.For example, different emitters can be different by taking
N1 can also be changed N1 transmitting the corresponding mark TXID of the emitter, same emitter by timesharing and send transmission
Parameter.Preferably, L takes 16.
In another example, the predetermined length is 1024, NCPFor 512+7*L, LenB512+i*L, 0≤i ＜ are can use for 512, N1
7, transmit 3bit signaling informations.Preferably, L takes 16.
Above is in the embodiment of the present invention leading symbol of the generation method of leading symbol and CAB structures characteristic.Connecing
Receiving end, it is possible to use the characteristic of above-mentioned leading symbol is come the baseband signal that judges to receive (to the physical frame that receives at
Obtained after reason) with the presence or absence of the signal for expecting to receive, and in the case where the judgment result is yes, determine leading symbol in physical frame
In position and solve the signaling information entrained by the leading symbol so that the instruction decoding subsequent data frame according to signaling information
Information.
As shown in Fig. 3 in a kind of physical frame of the invention the receiving handling method of leading symbol embodiment
Schematic flow sheet.With reference to Fig. 3, receiving handling method comprises the following steps：
Step S11：The physical frame received is handled to obtain baseband signal；
Step S12：Judge with the presence or absence of the leading symbol for expecting to receive in the baseband signal, wherein, the expectation connects
The leading symbol of receipts be based on time-domain OFDM symbol, its front portion with cyclic prefix, its rear portion have modulated signal when
Domain structure；
Step S13：In the case where above-mentioned judged result is to be, position and solution of the leading symbol in physical frame are determined
Go out the signaling information entrained by the leading symbol.
As described in step S11, the physical frame received is handled to obtain baseband signal.Usual receiving terminal
The signal received is analog signal, it is therefore desirable to first carry out analog-to-digital conversion to it to obtain data signal, then be filtered, under
Baseband signal is obtained after the processing such as sampling.If it should be noted that what receiving terminal received is intermediate-freuqncy signal, passing through mould to it
Also need to carry out frequency spectrum shift after number conversion process, be then filtered again, obtain baseband signal after the processing such as down-sampling.
As described in step S12, judge with the presence or absence of the leading symbol for expecting to receive in the baseband signal, wherein, it is described
It is that, based on time-domain OFDM symbol, there is cyclic prefix, its rear portion there is modulation to believe for its front portion to expect the leading symbol received
Number spatial structure.
Specifically, first, receiving terminal will determine that in the baseband signal received with the presence or absence of the leading character for expecting to receive
Number, that is, whether the signal received meets reception standard, and such as receiving terminal needs to receive the data of DVB_T2 standards, then needs to sentence
Whether whether the signal that disconnecting is received be (such as, to be had based on DVB_T2 standards in physical frame in the leading of DVB_T2 forms
Symbol).
In the present embodiment, judge that the leading symbol in the baseband signal with the presence or absence of expectation reception includes following step
Suddenly：
Step S12A：According to cyclic prefix, time-domain OFDM symbol and the modulated signal in the leading symbol for expecting to receive
Delay relation and frequency modulation relation between any two, delay is carried out to baseband signal and slides related and demodulation frequency deviation, to obtain
The related accumulated value of three delays；
Step S12B：Performed mathematical calculations based on one, two or three in the related accumulated value of these three delays, and
Peakvalue's checking is carried out to the absolute value of the mathematical operation result；
Step S12C：If the result of peakvalue's checking meets preparatory condition, it is determined that connect in the baseband signal in the presence of expectation
The signal of receipts.
Specifically, with reference to foregoing embodiments, the time-domain expression of leading symbol is：
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 sequence 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.
Because the leading symbol for expecting to receive is that, based on time-domain OFDM symbol, its front portion has cyclic prefix, thereafter
Portion has the spatial structure of modulated signal.So receive in signal if comprising the expectation leading symbol, then its include
Or every multipath all has said structure in a plurality of multipath.
Delay relation based on cyclic prefix and time-domain OFDM symbol, will receive signal and carry out delay slip correlation, it prolongs
Slow associated expression U1And the related accumulated value U of delay (n)1' (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 relation and frequency modulation value based on modulated signal and cyclic prefix, will receive signal and carry out delay slip phase
Close and demodulate frequency deviation, notice that it postpones associated expression U2And the related accumulated value U of delay (n)2' (n) as follows：
It is same to may be selected to U2' (n) carry out energy normalized obtain U2s'(n)。
Delay relation based on modulated signal and time-domain OFDM symbol and and frequency modulation value, signal will be received and postponed
Slide related, its delay associated expression U3And the related accumulated value U of delay (n)3' (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 take LenBTo cause peak value 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) leading symbol capture is carried out, judged in baseband signal with the presence or absence of expecting
The signal of reception.
Such as NA=1024, Ncp=520, LenBWhen=504, N1=520,
Receiving signal delayed 1024 sampled points and reception signal are entered into line slip related tired to obtain the first delay correlation
It is value added；
Receiving signal delayed 1528 sampled points and the reception signal that JieDuHuaYu II Decoction is to the rear are entered into line slip related to obtain
The related accumulated value of two delays；
Receiving signal delayed 504 sampled points and the reception signal that JieDuHuaYu II Decoction is to the rear are entered into line slip related to obtain the 3rd
The related accumulated value of delay.
And for example NA=1024, Ncp=512, LenBWhen=512, N1=512,
Receiving signal delayed 1024 sampled points and reception signal are entered into line slip related tired to obtain the first delay correlation
It is value added；
Receiving signal delayed 1536 sampled points and the reception signal that JieDuHuaYu II Decoction is to the rear are entered into line slip related to obtain
The related accumulated value of two delays；
Receiving signal delayed 512 sampled points and the reception signal that JieDuHuaYu II Decoction is to the rear are entered into line slip related to obtain the 3rd
The related accumulated value of delay.
When leading symbol occurs, U2'(n)·U3'*Or U (n)1'(n-NA+N1)·U2'(n)·U3'*(n) absolute
Peak value occurs in value.Therefore can be by U2'(n)·U3'*Or U (n)1'(n-NA+N1)·U2'(n)·U3'*(n) or
U after energy normalized2s'(n)·U3s'*Or U (n)1s'(n-NA+N1)·U2s'(n)·U3s'*(n), using various peak values
The algorithm of detection come judge in baseband signal with the presence or absence of expect receive signal.If the result of peakvalue's checking meets default bar
Part, it is determined that there is the leading symbol for expecting to receive and the signal for expecting reception in the baseband signal.Such as, it is maximum with peak value
Value is compared with fixed threshold, be there is the leading symbol and signal for expecting to receive if more than threshold value, is otherwise not present.
Determine that position of the leading symbol in physical frame includes in the step S12：Based on the peak value for meeting preparatory condition
The result of detection determines position of the leading symbol in physical frame.
Specifically, if there is the leading symbol for expecting to receive, before being determined according to the big part value of peak value or maximum
Lead the position that symbol occurs in physical frame.
Fractional part of frequency offset estimation can also be carried out using the result of peakvalue's checking, can be by taking the big value of peak value by following 2
The value weighting that the method for kind is calculated is obtained.
Method 1：
Wherein, NfRefer to the points of the peak value of participation statistics greatly, expression takes how many points on peak value to participate in computing, also can only taken
Maximum is calculated.
Method 2：
Wherein, k, which takes, makes U1' (k) maximum absolute value point.
Further, because transmitting terminal can be using N1 (in the time-domain OFDM symbol for intercepting modulated signal length
Different original positions) transmit signaling information, then, the leading symbol for expecting to receive has the property that：
1) time-domain OFDM symbol for intercepting circulating prefix-length from the time-domain OFDM symbol is used as cyclic prefix；
2) the time-domain OFDM symbol generation modulated signal of the circulating prefix-length based on above-mentioned interception；
Wherein, in the time-domain OFDM symbol for intercepting circulating prefix-length, different original position interception modulation are selected
The time-domain OFDM symbol of signal length produces modulated signal, so that the leading symbol ultimately formed passes through the different starting
Signaling information is transmitted in position；
In this case, based on different original positions, produce several different modulated signals and cyclic prefix and
The delay relation of modulated signal and time-domain OFDM symbol, is judged in the baseband signal with the presence or absence of the leading of expectation reception with this
Symbol.In the case where above-mentioned judged result is to be, position of the leading symbol in physical frame is determined.
According to several different modulated signals and cyclic prefix and modulated signal and the delay relation of time-domain OFDM symbol,
And then the related accumulated value group of several delays is obtained, every group is included to baseband signal according to following in the leading symbol for expecting to receive
The delay relation and frequency modulation relation progress delay slip phase of ring prefix, time-domain OFDM symbol and modulated signal between any two
Close and demodulation frequency deviation, to obtain the related accumulated value of three delays；
The related accumulated value of one, two or three delay in the related accumulated value group of each delay is subjected to computing, and it is right
The absolute value of the product calculation result carries out peakvalue's checking；
If the result of a certain group of peakvalue's checking meets preparatory condition, it is determined that exist in the baseband signal and expect what is received
Leading symbol.
For example, when leading symbol transmits Q bit signallings using different N1, it is certain fixation value to define above-mentioned N1
Delay slide be related as one group.Every group includes the related accumulated value of above-mentioned 3 delays.Receiving terminal carries out 2 simultaneouslyQDifferent N1 are planted to take
The above-mentioned delay relevant group of value, then from 2QIndividual U2'(n)·U3'*Or U (n)1'(n-NA+N1)·U2'(n)·U3'*(n) exhausted
To in value, judging whether desired leading symbol.
If any one absolute value is all not above threshold value thresholding, shows to be not present in baseband signal and expect what is received
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 is expressed as emergency alarm or broadcast system, then carries out 2 groups of above-mentioned delay relevant group.
Emergency alarm broadcast flag is 0 that group, i.e. N1=520 takes
It is related that receiving signal delayed 1024 sampled points enter line slip to reception signal；
It is related that receiving signal delayed 1528 sampled points enter line slip to the reception signal that JieDuHuaYu II Decoction is to the rear；
It is related that receiving signal delayed 504 sampled points enter line slip to the reception signal that JieDuHuaYu II Decoction is to the rear；
Emergency alarm broadcast flag is 1 that group, i.e. N1=504 takes
It is related that receiving signal delayed 1024 sampled points enter line slip to the reception signal that JieDuHuaYu II Decoction is to the rear；
It is related that receiving signal delayed 1544 sampled points enter line slip to the reception signal that JieDuHuaYu II Decoction is to the rear；
It is related that receiving signal delayed 520 sampled points enter line slip to the reception signal that JieDuHuaYu II Decoction is to the rear.If N1=520's
That group of maximum exceedes threshold value thresholding, then shows baseband signal for desired signal, and leading symbol occurs, EAS_flag=0；Phase
Instead, if N1=504 that group of maximum exceedes threshold value thresholding, EAS_flag=1 is shown；If 2 groups are all not above threshold value door
Limit, then it is not desired signal to show the baseband signal.
The signaling information solved in the step S13 entrained by the leading symbol comprises the following steps：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 the signaling information entrained by the leading symbol.
Specifically, in this step, because transmitting terminal (can intercept the time-domain OFDM symbol of modulated signal length using N1
In different original positions) transmit signaling information, can also utilize in time-domain OFDM symbol corresponding frequency-domain OFDM symbol
Signaling sequence subcarrier transmits signaling information.Therefore, receiving terminal is by based on the different side for transmitting signaling information of above two
Formula correspondingly solves signaling information, implements process as follows：
Transmitting terminal transmits signaling information using N1：
As described above, in the case that receiving terminal can be according to above-mentioned judged result, solving entrained by the leading symbol
Signaling information.If the result of a certain group of peakvalue's checking meets preparatory condition, the start bit of the corresponding modulated signal section of the group
It is transmission signaling to put corresponding 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, its
Middle null sequence subcarrier is located at the both sides of effective subcarrier；Effective subcarrier includes fixed sequence program subcarrier and signaling sequence is carried
Ripple, and fixed sequence program subcarrier and the arrangement of signaling sequence subcarrier oem character set.I.e. fixed sequence program is filled (or strange to even subcarrier
Subcarrier) on position, correspondingly, signaling sequence is filled to strange subcarrier (or even subcarrier) position, so that 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 when 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
Row.
Wherein, the generation method of signaling sequence and fixed sequence program can be：One is selected from all optional fixed sequence programs
Individual fixed sequence program, and the signaling sequence set with good autocorrelation and cross correlation is generated, and based on the fixed sequence program
Meeting required after inverse fourier transform with the OFDM symbol that any signaling sequence is constituted in signaling sequence set
Power PAR.
One specific embodiment is,
Fixed sequence program length is 353, and amplitude is 1, as following formula is represented：
Wherein, ωnValue it is as shown in the table by rows from left to right in order：
The number of signaling sequence is 512, and the signaling sequence set includes 4 signaling sequence subclass, each signaling
Sequence subset is closed comprising 128 signaling sequences, and the length L of signaling sequence is 353.
The generation formula method of signaling sequence：
Digit (the q of cyclic shifti,ki, i=0~2N- 1) wherein N=7, represents that each signaling sequence subclass includes 128
Individual signaling sequence, altogether 4 subclass totally 512 signaling sequences；
First, CAZAC sequences are generated：
Then, cyclic shift is carried out to it：
si *(n)=[s (ki-1),s(ki),...,S(root-1),s(0),...,s(ki-1)]
Finally, intercepted length is L sequence since the head of above-mentioned sequence：
SCi(n)=si *(n), n=0~L-1
Resulting sequence SCi(n) it is i-th required of signaling sequence.
It in the average power ratio of fixed sequence program and signaling sequence, this example is 1. that R, which is,
1) the root values of first signaling sequence subclass are 353；
The value of q values is all numerical value in following form：
| 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 form：
| 105 | 244 | 172 | 249 | 280 | 251 | 293 | 234 | 178 | 11 | 63 | 217 | 83 | 111 | 282 |
| 57 | 85 | 134 | 190 | 190 | 99 | 180 | 38 | 191 | 22 | 254 | 186 | 308 | 178 | 251 |
| 277 | 261 | 44 | 271 | 265 | 298 | 328 | 282 | 155 | 284 | 303 | 113 | 315 | 299 | 166 |
| 342 | 133 | 115 | 225 | 13 | 26 | 326 | 148 | 195 | 145 | 185 | 121 | 58 | 162 | 118 |
| 151 | 182 | 230 | 39 | 249 | 305 | 309 | 144 | 188 | 181 | 265 | 140 | 212 | 137 | 10 |
| 298 | 122 | 281 | 181 | 267 | 178 | 187 | 177 | 352 | 4 | 353 | 269 | 38 | 342 | 288 |
| 277 | 88 | 124 | 120 | 162 | 204 | 174 | 294 | 166 | 157 | 56 | 334 | 110 | 183 | 131 |
| 171 | 166 | 321 | 96 | 37 | 261 | 155 | 34 | 149 | 156 | 267 | 332 | 93 | 348 | 300 |
| 245 | 101 | 186 | 117 | 329 | 352 | 215 | 55 |
2) the root values of second signaling sequence subclass are 367；
The value of q values is all numerical value in following form：
The digit of cyclic shift is all numerical value in following form：
| 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 values of the 3rd signaling sequence subclass are 359；
The value of q values is all numerical value in following form：
| 1 | 3 | 5 | 6 | 9 | 12 | 14 | 22 | 29 | 30 | 32 | 34 | 60 | 63 | 65 |
| 67 | 72 | 74 | 76 | 78 | 83 | 84 | 87 | 88 | 89 | 90 | 91 | 92 | 94 | 95 |
| 96 | 99 | 112 | 115 | 123 | 124 | 128 | 137 | 141 | 143 | 145 | 149 | 152 | 153 | 154 |
| 155 | 159 | 164 | 165 | 169 | 175 | 179 | 183 | 186 | 187 | 188 | 189 | 192 | 197 | 199 |
| 201 | 202 | 203 | 211 | 215 | 219 | 220 | 221 | 223 | 226 | 227 | 228 | 229 | 230 | 234 |
| 237 | 238 | 239 | 243 | 246 | 248 | 249 | 250 | 252 | 254 | 257 | 258 | 261 | 262 | 273 |
| 274 | 280 | 282 | 284 | 286 | 288 | 290 | 297 | 298 | 300 | 303 | 308 | 309 | 310 | 312 |
| 313 | 314 | 317 | 318 | 319 | 320 | 321 | 322 | 323 | 324 | 326 | 333 | 334 | 335 | 336 |
| 339 | 341 | 342 | 344 | 349 | 351 | 352 | 355 |
The digit of cyclic shift is all numerical value in following form：
| 300 | 287 | 80 | 119 | 68 | 330 | 93 | 359 | 17 | 93 | 355 | 308 | 106 | 224 | 20 |
| 18 | 226 | 165 | 320 | 339 | 352 | 316 | 241 | 336 | 119 | 166 | 258 | 273 | 302 | 275 |
| 46 | 26 | 259 | 330 | 206 | 46 | 10 | 308 | 165 | 195 | 314 | 330 | 208 | 148 | 275 |
| 15 | 214 | 251 | 8 | 27 | 264 | 169 | 128 | 207 | 21 | 246 | 14 | 291 | 345 | 114 |
| 306 | 179 | 109 | 336 | 322 | 149 | 270 | 253 | 207 | 152 | 26 | 190 | 128 | 137 | 196 |
| 268 | 36 | 40 | 253 | 29 | 264 | 153 | 221 | 341 | 116 | 24 | 55 | 60 | 171 | 25 |
| 100 | 202 | 37 | 93 | 115 | 174 | 239 | 148 | 170 | 37 | 328 | 37 | 253 | 237 | 355 |
| 39 | 288 | 225 | 223 | 140 | 163 | 145 | 264 | 75 | 29 | 282 | 252 | 270 | 30 | 262 |
| 271 | 305 | 122 | 78 | 27 | 127 | 92 | 6 |
4) the root values of the 4th signaling sequence subclass are 373；
The value of q values is all numerical value in following form：
| 26 | 28 | 29 | 34 | 38 | 40 | 43 | 49 | 54 | 57 | 58 | 62 | 64 | 65 | 79 |
| 80 | 81 | 83 | 85 | 86 | 87 | 101 | 102 | 187 | 189 | 190 | 191 | 193 | 194 | 195 |
| 196 | 198 | 199 | 200 | 202 | 204 | 205 | 206 | 208 | 209 | 211 | 213 | 214 | 216 | 217 |
| 218 | 219 | 220 | 221 | 222 | 223 | 224 | 225 | 227 | 228 | 230 | 232 | 233 | 236 | 237 |
| 241 | 243 | 245 | 246 | 247 | 248 | 249 | 250 | 251 | 252 | 253 | 255 | 256 | 259 | 260 |
| 261 | 262 | 263 | 265 | 266 | 267 | 275 | 276 | 280 | 282 | 283 | 284 | 285 | 289 | 295 |
| 297 | 300 | 301 | 302 | 303 | 305 | 307 | 317 | 320 | 322 | 323 | 325 | 327 | 328 | 332 |
| 338 | 341 | 342 | 343 | 348 | 349 | 351 | 352 | 353 | 355 | 356 | 357 | 358 | 359 | 360 |
| 361 | 362 | 363 | 364 | 367 | 369 | 370 | 372 |
The digit of cyclic shift is all numerical value in following form：
| 333 | 337 | 177 | 125 | 169 | 270 | 254 | 88 | 123 | 310 | 96 | 273 | 120 | 239 | 157 |
| 224 | 62 | 119 | 19 | 235 | 136 | 117 | 237 | 100 | 244 | 181 | 295 | 249 | 356 | 9 |
| 289 | 139 | 82 | 171 | 178 | 292 | 158 | 308 | 257 | 42 | 55 | 210 | 320 | 294 | 100 |
| 75 | 79 | 163 | 195 | 80 | 303 | 97 | 271 | 179 | 359 | 178 | 241 | 281 | 367 | 58 |
| 91 | 7 | 179 | 39 | 267 | 245 | 213 | 286 | 349 | 172 | 35 | 301 | 361 | 102 | 301 |
| 155 | 1 | 34 | 96 | 293 | 202 | 87 | 176 | 248 | 319 | 301 | 168 | 280 | 154 | 244 |
| 215 | 370 | 260 | 117 | 30 | 329 | 42 | 149 | 112 | 125 | 50 | 249 | 197 | 273 | 230 |
| 13 | 142 | 244 | 335 | 57 | 21 | 261 | 48 | 370 | 110 | 296 | 326 | 224 | 77 | 112 |
| 31 | 262 | 121 | 38 | 283 | 323 | 93 | 94 |
This 4 signaling sequence subclass are merged, signaling sequence t easet ofasubcarriers are obtained.
Therefore, the signaling information that receiving terminal is solved entrained by the leading symbol includes：By including signaling sequence subcarrier
Corresponding with signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers time-domain signal of signal carry out computing, to solve
As the signaling information entrained by signaling sequence subcarrier in the leading symbol.
Wherein, the signal comprising signaling sequence subcarrier includes：The leading symbol received it is all or part of
Time domain waveform, or the frequency-domain OFDM symbol obtained after time-domain OFDM symbol is fourier transformed is intercepted from leading symbol.Letter
Making sequence t easet ofasubcarriers is gathered as formed by filling to effective subcarrier each signaling sequence in signaling sequence set.
Specifically, the N of correspondence ODFM symbol main bodys is interceptedAThe time-domain signal of length obtains frequency domain after carrying out Fourier transform
OFDM symbol；Then, zero carrier is removed, the frequency domain signaling sub-carriers received are taken out according to signaling sub-carriers position.By its with
Above-mentioned channel estimation value and known signaling sub-carriers collection carry out specific mathematical operation, complete frequency domain decoding function.
For example, setting i=0:M-1, M are signaling sub-carriers number, j=0:2P- 1, P make bit number for frequency domain is transmitted, i.e.,
Correspondence signaling sub-carriers collection has 2PIndividual element, and the sequence that each element correspondence length is M, HiFor each signaling sub-carriers pair
The channel estimation value answered, SC_reciFor the frequency domain signaling sub-carriers value received,J-th of element is concentrated for signaling sub-carriers
In i-th of value.ThenJ=0:2P- 1, take max (corrj) corresponding to j, i.e.,
Obtain the signaling information of frequency-domain transmission.
In other embodiments, said process can also be carried out in time domain, using known signaling sub-carriers collection through in Fu
Corresponding time domain signaling waveform collection is directly synchronized with obtaining the time-domain received signal of multipath accurate location after leaf inverse transformation
Correlation, takes that of correlation maximum absolute value, can also solve the signaling information of frequency-domain transmission, repeat no more here.
Further, receiving terminal can also do integer frequency offset estimation or channel estimation using fixed sequence program.
Specifically, the present embodiment also comprises the following steps：1) according to determining position of the leading symbol in physical frame,
Interception includes the signal of fixed subcarrier；2) this is included to the signal and frequency domain stator carrier wave sequence or the frequency of fixed subcarrier
Stator carrier wave sequence corresponding time-domain signal in domain carries out computing, to obtain integer frequency offset estimation or channel estimation.
Wherein, the signal comprising fixed subcarrier includes：The all or part of time domain of the leading symbol received
Waveform, or the frequency-domain OFDM symbol obtained after time-domain OFDM symbol is fourier transformed is intercepted from leading symbol.
The two methods that receiving terminal carries out integer frequency offset estimation are detailed below.
Method 1：
According to position of the leading symbol detected in physical frame, intercept the leading symbol received time domain waveform it is complete
Portion or a part.By the way of frequency sweep, i.e., with fixed frequency change step footpath (such as, correspondence integer frequency offset interval), by this
After the upper different frequency deviation of part time domain waveform modulation, several time-domain signals are obtained：
T is sampling period, fsFor sample frequency.And known frequency domain fixed sequence program subcarrier carries out the corresponding time domain letter of inverse fourier transform
Number be A2, regard A2 as known signal and each A1yEnter line slip correlation, choose that A1 for maximum correlation peaks occury, then
The frequency deviation value y modulated to it is integer frequency offset estimation value.
Wherein, the frequency deviation region of confrontation required for swept frequency range correspondence system, such as, it is necessary to resist positive and negative 500K frequency deviation,
And systematic sampling rate is 9.14M, leading symbol main body is 1K length, then swept frequency range isThat is [- 57,57].
Method 2：
The time-domain signal of correspondence ODFM symbol main bodys obtains frequency-domain OFDM after carrying out Fourier transform in interception leading symbol
Symbol, will convert the cyclic shift of the obtained above-mentioned swept frequency range of frequency-domain OFDM symbol progress, and is multiplied every 2 difference, and with
Known fixed sequence subcarrier carries out related operations every 2 difference multiplied values, obtains a series of correlations, chooses maximal correlation
It is worth corresponding cyclic shift, you can accordingly obtain that integer frequency offset estimation value can be obtained.
Using the signal comprising fixed sequence program subcarrier and known frequency domain fixed sequence program subcarrier that receive and/or its enter
The corresponding time-domain signal of row inverse fourier transform completes channel estimation, can equally select to carry out and/or in frequency domain enter in time domain
OK, it will not be repeated here.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and techniques content of the disclosure above to this hair
Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention
Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention
Protection domain.
Claims (10)
1. the receiving handling method of leading symbol in a kind of physical frame, it is characterised in that comprise the following steps：
The data signal received is handled to obtain baseband signal；
Judge with the presence or absence of the leading symbol for expecting to receive in the baseband signal, wherein, the leading symbol for expecting to receive
It is the spatial structure with cyclic prefix, modulated signal based on time-domain OFDM symbol；
In above-mentioned judged result in the case of being, to determine 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 claimed in claim 1, it is characterised in that judge the base band
Include in signal with the presence or absence of the leading symbol for expecting to receive：
According to the delay of cyclic prefix, time-domain OFDM symbol and the modulated signal in the leading symbol for expecting to receive between any two
Relation and frequency modulation relation, delay is carried out to baseband signal and slides related and/or demodulation frequency deviation, related to obtain three delays
Accumulated value；
Performed mathematical calculations based on one, two or three in the related accumulated value of these three delays, and to the operation result
Absolute value carry out peakvalue's checking；
If the result of peakvalue's checking meets preparatory condition, it is determined that there is the leading symbol for expecting to receive in the baseband signal.
3. the receiving handling method of leading symbol in physical frame as claimed in claim 1, it is characterised in that solve the leading character
Signaling information entrained by number comprises 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 the signaling information entrained by the leading symbol.
4. the receiving handling method of leading symbol in physical frame as claimed in claim 1, it is characterised 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 are located at the both 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 row
Row.
5. the receiving handling method of physical frame as claimed in claim 1, it is characterised in that also comprise the following steps：
The signaling information solved entrained by the leading symbol includes：
Pass through the signal comprising signaling sequence subcarrier and signaling sequence t easet ofasubcarriers or the signaling sequence t easet ofasubcarriers pair
The time-domain signal answered carries out computing, to solve in the leading symbol as the signaling information entrained by signaling sub-carriers.
6. the receiving handling method of physical frame as claimed in claim 1, it is characterised in that also comprise the following steps：
According to position of the leading symbol in physical frame is determined, interception includes the signal of fixed sequence program subcarrier；
The signal comprising 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 ripple carries out computing, to obtain integer frequency offset estimation or channel estimation.
7. the receiving handling method of leading symbol in physical frame as claimed in claim 10, it is characterised 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 is carried out
Split-phase is closed and cyclic shift, and known frequency domain fixed sequence program subcarrier carries out difference correlation, and is entered according to the result of both
Row computing and obtain.
8. the receiving handling method of leading symbol in physical frame as claimed in claim 6, it is characterised in that the integer frequency
Partially estimation based on the time-domain OFDM symbol in leading symbol in the way of frequency sweep it is corresponding with known frequency domain fixed sequence program subcarrier
Time-domain signal computing and obtain.
9. the receiving handling method of leading symbol in physical frame as claimed in claim 5, it is characterised in that described to solve before this
Leading the signaling information entrained by symbol includes：
The all or part of time domain waveform and known letter of leading symbol based on certain the multipath accurate location of acquisition received
Make the corresponding time-domain signal of sequence t easet ofasubcarriers synchronize related operation one by one, utilize that of correlation maximum absolute value
To solve corresponding signaling information.
10. the receiving handling method of leading symbol in physical frame as claimed in claim 5, it is characterised 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 specific mathematical operation, to solve in the leading symbol by signaling sub-carriers
Entrained signaling information.
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| 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 |
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