CN110166400A - Synchronous method, device, the network equipment and the storage medium of high-speed industrial communication system - Google Patents
Synchronous method, device, the network equipment and the storage medium of high-speed industrial communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
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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
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2671—Time domain
Abstract
The embodiment of the present application discloses a kind of for the synchronous method of high-speed industrial communication system, device, the network equipment and storage medium.Device broadcasts frame head synchronizing pilot signal is controlled, frame head synchronizing pilot signal includes continuous two synchronous OFDM symbols, and the subcarrier in frequency domain of two synchronous OFDM symbols loads same pilot sequence.Synchronous method includes: to extract continuous first and second object synchronizations OFDM symbol according to emission mode；Time domain auto-correlation computation is done to the synchronous OFDM symbol of first object；Signal initial time is determined according to the result of time domain auto-correlation computation.Industry spot conventional bus low bandwidth can be solved the problems, such as according to the high-speed industrial communication system and method for the application, can not carry the real-time and non real-time and complicated network structure simultaneously, support IPV6 address communication, it supports the industrial communication of time trigger, supports the security mechanisms such as TSN, white list, depth detection and data encryption.
Description
Technical field
The invention relates to industrial communications and control field, the more particularly, to synchronization of high-speed industrial communication system
Method, apparatus, the network equipment and storage medium.
Background technique
It is usually mounted on industrial circle, high-speed industrial control bus multiple industrial equipments (such as measuring instrumentss), while every
A industrial equipment can be communicated by high-speed industrial control bus, such as transmission of control signals, for control industrial equipment into
Row industrial production activities.
High-speed industrial control bus is higher to the requirements of real time of data, and industrial equipment needs to carry out time synchronization
(for example, time synchronization, clock are synchronous, carrier frequency synchronization), to realize high-precision industrial production activities.High-speed industrial at present
Control bus mostly uses Network Time Protocol (Network Time Protocol, NPT) or Institute of Electrical and Electronics Engineers
The IEEE 1588 of (Institute of Electrical and Electronics Engineers, IEEE), by stamping
The mode of timestamp realizes network time synchronization.
With big data development and smart machine it is universal, in high-speed industrial control, the data that need to transmit
It is more and more, and transmission rate request is higher.Meanwhile the complexity of data and transmission difficulty also greatly increase.For above-mentioned
Problem, NPT are influenced by factors such as queue time delay, switching delay and medium access time delays, and the error of time synchronization becomes larger, Wu Faman
The demand of the current real-time data transmission of foot.Meanwhile IEEE1588 is by oscillator frequency error, network symmetry and network delay
Deng influence, the error of time synchronization becomes larger, without the demand for being also unable to satisfy current real-time data transmission.
Summary of the invention
The embodiment of the present application provide it is a kind of for the synchronous method of high-speed industrial communication system, device, the network equipment and
Storage medium can be improved the synchronous precision of high-speed industrial control, meet the needs of real-time data transmission.
According to the application in a first aspect, providing a kind of for the same of high-speed industrial terminal in communication system node device
One step process, the high-speed industrial communication system include control equipment and the end node devices, the high-speed industrial communication system
System provides OFDM symbol time width different a variety of emission modes, the physical layer signal frame packet of the high-speed industrial communication system
The frame head synchronizing pilot signal of the control device broadcasts is included, the frame head synchronizing pilot signal includes continuous two synchronizations
The subcarrier in frequency domain of OFDM symbol, described two synchronous OFDM symbols loads same pilot sequence, the preceding synchronization of time-domain position
The subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions, the synchronous method packet in OFDM symbol
It includes:
According to emission mode, the synchronous OFDM symbol of continuous first object and the second object synchronization OFDM symbol, institute are extracted
The synchronous OFDM symbol time-domain position of first object is stated preceding；
Time domain auto-correlation computation is done to the synchronous OFDM symbol of the first object；
Signal initial time is determined according to the result of the time domain auto-correlation computation.
According to the application second aspect, a kind of synchronous method for high-speed industrial communication system, the high speed work are provided
Industry communication system includes control equipment and the end node devices, and the high-speed industrial communication system provides the OFDM symbol time
A variety of emission modes of different size, the synchronous method include: according to emission mode, and the control device broadcasts frame head is synchronous
Pilot signal, the frame head synchronizing pilot signal include continuous two synchronous OFDM symbols, described two synchronous OFDM symbols
Subcarrier in frequency domain load same pilot sequence, the subcarrier in frequency domain of even number position in the preceding synchronous OFDM symbol of time-domain position
Zero setting or the subcarrier in frequency domain zero setting of odd positions.
According to the application third aspect, a kind of frame head structure is provided, is applied to during high-speed industrial communication system communication
Physical layer signal frame, comprising: continuous two synchronous OFDM symbol resources, the synchronous OFDM symbol resource for carry lead
Frequency signal；Wherein, the corresponding pilot frequency sequence to be loaded of described two synchronous OFDM symbol resources is identical, and time-domain position is preceding
Synchronization OFDM symbol resource in the subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions.
According to the application fourth aspect, a kind of synchronous dress for high-speed industrial terminal in communication system node device is provided
It sets, the high-speed industrial communication system includes that control equipment and the end node devices, the high-speed industrial communication system mention
For the different a variety of emission modes of OFDM symbol time width, the physical layer signal frame of the high-speed industrial communication system includes institute
The frame head synchronizing pilot signal of control device broadcasts is stated, the frame head synchronizing pilot signal includes continuous two synchronous OFDM symbols
Number, the subcarrier in frequency domain of described two synchronous OFDM symbols loads same pilot sequence, the preceding synchronous OFDM symbol of time-domain position
The subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions in number, the synchronizing device include: to extract
Module, for extracting the synchronous OFDM symbol of continuous first object and the second object synchronization OFDM symbol, institute according to emission mode
The synchronous OFDM symbol time-domain position of first object is stated preceding；Related operation module, for the synchronous OFDM symbol of the first object
Number do time domain auto-correlation computation；Determination module, for determining signal initial time according to the result of the time domain auto-correlation computation.
According to the 5th aspect of the application, a kind of network equipment is provided, including memory, processor and storage are on a memory
And the instruction that can be executed on a processor, which is characterized in that state realized when processor executes described instruction it is aforementioned any described
Synchronous method.
According to the 6th aspect of the application, a kind of machine readable storage medium is provided, computations are stored thereon with, the calculating
Aforementioned any synchronous method is realized in instruction when being executed by processor.
The embodiment of the present application in high-speed industrial communication system using synchronous OFDM frequency pilot sign, realize time synchronization and when
Clock is synchronous, and the time synchronization of high-speed industrial communication system and the precision that clock is synchronous can be improved, pass in real time to meet data
Defeated demand.
Therefore, according to the high-speed industrial communication system and method for the application can solve industry spot conventional bus low bandwidth,
The problem of real-time and non real-time and complicated network structure can not be carried simultaneously, supports IPV6 address communication, supports time trigger
Industrial communication, support the security mechanisms such as TSN, white list, depth detection and data encryption.
Detailed description of the invention
Fig. 1, which is shown, can apply the network topology of the high-speed industrial communication system of the synchronous method according to the embodiment of the present application to show
It is intended to；
Fig. 2 shows the communication protocol stack frameworks that the embodiment of the present application uses；
Fig. 3 shows the structure and OFDM symbol for the signal frame that the embodiment of the present application uses；
Fig. 4 shows the block diagram for the signal of communication frame that the embodiment of the present application uses；
Fig. 5 shows the transmitting of signal according to example embodiment and receives the physical layer procedure schematic diagram of system；
Fig. 6 shows scrambler sequence according to example embodiment and generates schematic diagram；
Fig. 7 a shows the convolution coder that code rate according to example embodiment is 1/2；
Fig. 7 b shows m-sequence generator according to example embodiment；
Fig. 8, which is shown, can be used for the same of aforementioned high-speed industrial terminal in communication system node device according to the embodiment of the present application
One step process；
Fig. 9 shows the autocorrelation performance schematic diagram of OFDM symbol according to the embodiment；
Figure 10 shows the synchronizing device for high-speed industrial terminal in communication system node device according to example embodiment；
Figure 11 shows the structural schematic diagram of the network equipment according to the embodiment of the present application.
Specific embodiment
The application is further discussed in detail with reference to the accompanying drawings and examples.However, example embodiment can
Implement in a variety of forms, and is not understood as limited to implementation set forth herein.There is provided these embodiments is to make this
Apply comprehensive and detailed, and the design of example embodiment is comprehensively communicated to those skilled in the art.It is identical in figure
Appended drawing reference indicates same or similar part, thus omits repetition thereof sometimes.
In following introductions, term " first ", " second " only for descriptive purposes, and should not be understood as instruction or dark
Show relative importance.Following introductions provide multiple embodiments of the application, can replace or merge between different embodiments
Combination, therefore the application is it is also contemplated that all possible combinations comprising documented identical and/or different embodiments.Thus, such as
Fruit one embodiment include feature A, B, C, another embodiment include feature B, D, then the application also should be regarded as include containing
A, the every other possible combined embodiment of one or more of B, C, D, although the embodiment may be in the following contents
In have specific literature record.
Following description provides example, and does not carry out to range, applicability described in claims or example
Limitation.The function and arrangement of the element of description can be made a change in the case where not departing from the range of teachings herein.Respectively
Various processes or component can suitably be omitted, substitute or be added to a example.Such as described method can be with described suitable
Sequence different sequence executes, and can add, omits or combine various steps.Furthermore, it is possible to will be retouched about some examples
The feature stated is combined in other examples.
Fig. 1, which is shown, can apply the network topology of the high-speed industrial communication system of the synchronous method according to the embodiment of the present application to show
It is intended to.
As shown in Figure 1, the communication system is a kind of use unbridged medium of two lines, 254 effective nodes can be supported,
In one be control node, other are terminal node.Control node is responsible for managing, distributes, recycles each system resource, and gives in real time
All node supplying system configurations, distribution communication bandwidth etc..Bus type networking can be used in the communication system, prewired by system
The mode set or dynamically applied provides fixed-bandwidth data service and supports the bandwidth varying data service of bursty data.It is described
Communication system is directed to periodic samples data, paroxysmal control, alarm and ISO/IEC/IEEE 8802-3 ethernet format
IPv4/IPv6 data can provide reliably with deterministic carrying.The function that the communication system has high precision clock synchronous
Can, it is provided based on time trigger and provides deterministic data transport service to time sensitivity and non-temporal sensitive services.
The communication system protocol trestle structure is as shown in Fig. 2, include physical layer, data link layer and application layer three parts.
Physical layer, which can be, realizes fieldbus of the creation based on share medium on two lines based on OFDM technology, completes
The conversion of physical signal is to ensure high reliability transport, but the application is without being limited thereto.Physics is carried out in OFDM time domain and frequency domain
The division and management of resource, to carry the data of data link layer.Physical layer to data link layer provide Clock management service,
Data transport service and physical layer management service three categories interface.OFDM (orthogonal frequency division multiplexing, Orthogonal Frequency
Division Multiplexing) destination channel is divided into multiple subchannels by technology, and these subchannels are orthogonal in frequency domain
's.In addition, the different modes that can be used on every sub-channels are modulated, actually data-signal is converted into counting by OFDM
It is transmitted according to flowing and being modulated on every sub-channels.Carrier wave is the periodical oscillator signal in channel, for being adjusted
Useful signal is transmitted after system.OFDM technology is in order to improve spectrum of carrier utilization rate, or in order to improve to multicarrier
Modulation and generate, since each subcarrier is mutually orthogonal, the frequency spectrum after alloing band spectrum modulation is overlapped, this reduces
Intercarrier interferes with each other.
By application OFDM, it can be achieved that having multinode, high bandwidth, the high-speed industrial communication system of time-sensitive, it is used for
The real time data of automation controls industry spot and the transmission of non-real-time data and application such as process control and discrete control, and can
The applications such as compatible ISO/IEC/IEEE 8802-3 Ethernet, IPv6.The communication system has high bandwidth high in real time, remote
The characteristic of high reliability transport, wiring and installation are simple, provide convenient network operation, support the benefit to existing cable assets
With.
Data link layer (DLL) mainly includes LLC sublayer and two layers of media access control sublayer.LLC sublayer includes LLC, time synchronization mould
Block and ISO/IEC/IEEE 8802-3LLC module.Media access control sublayer includes MAC and support ISO/IEC/IEEE 8802-3MAC
Media access control sublayer.Data link layer provides data link services, data link management service and three kinds of clock synchronous service to application layer
Service interface.
Application layer (AL) includes data service module and system administration services mould based on real-time application and non real-time application
Block, Time Service module, the TCP/UDP module based on IPv4/IPv6.Data service module provides user and completes real-time and non-reality
When related service processing, distinguish in real time and non-real-time service data buffer zone.System is opened up in the realization of system administration services module
It flutters, the management and maintenance of state.Time Service module provides the services such as synchronous, the clock inquiry of clock.
The communication system uses the physical layer design based on OFDM technology, can support time division multiplexing and frequency division multiple simultaneously
Operating mode.On frequency domain, the communication system can provide such as four kinds of different emission modes (0,1,2,3).User
Different emission modes can be selected according to the signal-to-noise ratio condition under the conditions of practical application.Under corresponding different emission modes, an OFDM
Symbol time width can be respectively such as 64us, 32us, 16us, 8us.
In the communication system, it can fix using such as 64 OFDM symbols as a frame, but the application is not limited to
This.Emission mode according to user's selection is different, and the frame period of the communication system can be differed from 500us to 4.0ms, the parameter
The needs of configuring under the conditions of can meeting different application to Different sampling period.Correspondence parameter under each mode of system can be such as 1 institute of table
Show.
Table 1
In the communication system, RS of the digital code stream that data link layer is sent out Jing Guo physical layer is encoded, convolution is compiled
After code and QAM mapping, respectively correspond on physical resource as defined in OFDM symbol and subcarrier, and carry out FFT modulation, then
It is emitted on cable after forming physical layer signal frame.Receiving end recovers digital signal and data flow by opposite process.
The sampling interval of the communication system in the time domain is for example are as follows: I.e. in different emission modes, the sampling interval is all fixed value, in the communication system, TSIt can value
10.17ns。
The basic unit of the communication system physical layer signal is OFDM symbol, such as 64 OFDM symbols form a letter
Number frame.Each OFDM symbol is equally divided into upper side band and lower sideband two parts again in subcarrier in frequency domain.High-frequency subcarrier portion
(for example, 16.896-32.256MHz) are divided to be known as upper side band, low frequency sub-carrier portions (for example, 1.536-16.896MHz) claim
For lower sideband.In the communication system assignment channel resource, upper and lower sideband can distribute to different device nodes.Signal
The structure and OFDM symbol of frame can be as shown in Figure 3.
Fig. 4 shows the block diagram of the communication system signal frame.
As shown in figure 4, the decomposable member of communication system signal frame is known as: frame pilot signal, can distribute downlink subframe
Resource etc..
Beginning of the frame pilot signal to identify a signal frame has the function of signal frame synchronization and frame head positioning.Frame
Pilot signal can for example be fixed on the sideband portion (frame pilot portion in such as Fig. 4) of the 1st, 2 OFDM symbol of every frame.
Downlink subframe can be used for being sent to the data and information of each terminal node from control node, it may include such as channel, band
Wide distribution condition, system maintenance information, multiple contents such as transmission data.Downlink subframe may include the following of >=2 OFDM symbols
Band part (descender in such as Fig. 4).
Allowable resource minimum unit can be half sideband (when selection use pattern A) of 1 OFDM symbol or 2 OFDM symbols
Number half sideband when use pattern B (selection).All blank parts are system allowable resource in Fig. 4, control node and
Each terminal node can apply for corresponding resource according to demand and be used to transmit related data.
Mode A is data not only to be transmitted in single half sideband of OFDM, but also transmit pilot signal, wherein pilot signal and data
The ratio of the number of subcarriers of occupancy is such as 1:8.
Mode B is to transmit pilot signal in first half sideband of OFDM of the allowable resource applied, and subsequent
1 to n OFDM symbol in transmit data.
Due to needing to distinguish and confirm by pilot frequency information the starting of a resource in the communication system, it removes
It needs to send outside frame pilot signal in the start-up portion of each signal frame, allowable resource is being distributed into control node or each
After a terminal node, it is also required to be inserted into pilot frequency information according to particular form in this resource, so that receiving end can be fast and accurately
Decode corresponding informance.Allowable resource supports two kinds of use patterns, such as Mode A and Mode B.The difference of two kinds of use patterns
It is to be inserted into the mode of pilot signal and data carrying structure difference.Use pattern A is typically used as the transmission of periodic cycle data
Application use, if maximum can support 8 user intervals to make in the communication system using the working method of use pattern A
With；Meanwhile use pattern A also supports the mode of multi-user cross interval resource mean allocation.Use pattern B both may be used as the period
Property circulation fixed rate data transmission use, be also used as variable-speed data transmission.
The physical layer of the communication system can configure multiple-working mode when carrying data in link layer.Different
Operating mode adapts to different channel circumstance and data transportation requirements.Emission mode, frame format under every kind of operating mode, modulation
Coding strategy can all influence the relationship of physical resource with the valid data amount that can be carried.
Data in link layer is that physical layer is transferred in the form of bit stream, these bit streams are encoded according to corresponding RS
It is divided into the RS code block of different length.RS code block is a unit of physical layer data processing, and an OFDM symbol carries effective
Byte number is the integral multiple of code block effective word joint number.The communication system altogether supports 22 kinds of operating modes, wherein in use pattern A
10 kinds of operating modes of lower support support 12 kinds of operating modes at use pattern B.
Fig. 5 shows the communication system transmitting according to example embodiment and receives the physical layer procedure schematic diagram of system.
As shown in figure 5, during the launch process, data flow difference is scrambled, RS is encoded, carries out data friendship after convolutional encoding
It knits, then forms ofdm signal after modulating by 16QAM, 64QAM or 256QAM, be combined into data according to different emission modes
Launch on cable after frame.Reception system is the inverse process of emission system, to from line coding signal by data
Stream is accurately decoded, is restored.
The transmission of physical layer signal is modulated using OFDM, and the core process for generating ofdm signal is IFFT (fast Fourier
Inverse transformation), reduction ofdm signal processing then corresponds to FFT (Fast Fourier Transform (FFT)).In given system bandwidth and sampling interval
In the case of, different FFT/IFFT sampling numbers can obtain different subcarrier spacing and OFDM symbol length.System is supported
0,1,2,3 totally four kinds of different emission modes, respectively correspond 4096,2048,1024,512 sampled points.
In order to avoid continuous 0,1 occurs, before the coding, the bit stream for including by MAC layer transmission block can be scrambled.
Scrambler sequence is the m-sequence that length is 11, generator polynomial x11+x2+ 1, intialization phase 11111111111.Sequence is raw
It grows up to be a useful person and is reinitialized when each code block starts.Scrambler sequence generating process is as shown in fig. 6, wherein enable indicates control
Switch, data are the bit stream to be scrambled of input, and output is the scrambled bit stream of output.
Physical layer coding can be used that such as Internal Code is convolutional code and outer code is the concatenated code of RS code.By the biography of CRC check
Defeated piece initially enters outer code coder and carries out RS coding, then enters back into interior code coder and carries out convolution coding.After coding
Bit enter bit interleaver and be interleaved processing.
RS code using original RS (255,247), RS (255,239), RS (255,223) systematic code shortening code, it is original
RS code length is 255 bytes, and it is the cyclic code based on finite field gf (256) that check byte length, which is 8,16 or 32 bytes, domain
Generator polynomial is p (x)=x8+x4+x3+x2+1.When RS code generator polynomial isL is verification bit length,
Input message sequence multinomial isK is information bit length, then systematic code exports multinomialWherein
Each byte is mapped as 8 bits by the principle that the transmission data that RS is encoded preferentially are sent according to high order bit
Stream, is sent into encoder for convolution codes, and code rate is respectively such as 1/2,2/3 and 3/4.Convolution coder is 7, code rate using constraint length
For 1/2 convolution coder, generator polynomial is such as G1=1718And G0=1338, as shown in Figure 7a.The displacement of encoder is posted
Storage initial value may be configured as the last corresponding value of 6 information bits of inlet flow, so that shift register is initial and final
State is identical.According to Fig. 7 a, coded bit stream is according to A, B Sequential output.By deleting coded-bit, available code rate is 2/
3 and 3/4 convolutional encoding.
Bit stream needs after coding are interleaved.Bit stream with NCBIBIt is grouped for interleaving block, in downlink,
All encoded data bits interweave all in the half son of an OFDM symbol with progress.Intertexture is divided into the displacement of two steps, sets for the first time
Changing ensures adjacent encoder bit map to non-conterminous subcarrier, and displacement ensures that adjacent coded-bit is alternately mapped for the second time
To the high significance bit and low order bit of constellation.Specific interlacing rule is for example are as follows:
It replaces for the first time:
I=(NCBIB/NCOL)(kmodNCOL)+floor(k/NCOL) k=0,1 ... NCBIB, N hereCBIBIt is long for interleaving block
Degree, k are the coded-bit serial number before replacing for the first time, and i is the coded-bit serial number after replacing for the first time.
Second of displacement:
J=s*floor (i/s)+(i+NCBIB-floor(i*NCOL/NCBIB)) mods i=0,1 ... NCBIBS=max
(NBPS/ 2,1) the coded-bit serial number after, j replaces here for second, NBPSBit corresponding to one modulation symbol
Number.Downlink intertexture configuration parameter is as shown in table 6, wherein the optional intertexture mode 3,4 of use pattern A, the optional intertexture mould of use pattern B
Formula 0,1,2.
Binary digit 0,1 as inputting, is generated complex modulation output symbol x by modulation mapper.Modulate mapping scheme
For tri- kinds of modes of 16QAM, 64QAM, 256QAM.Binary number obtains constellation point Z according to modulation system, is then normalized
To correct complex modulation symbols x.
The communication system supports various code modulation modes, and the primary modulation at use pattern A and use pattern B is compiled
Code strategy is as shown in table 2 and table 3.
Table 2: the modulating-coding strategy under use pattern A
Table 3: the modulating-coding strategy under use pattern B
Pilot frequency sequence is x by such as generator polynomial11+x8+x5+x2+ 1 m-sequence generates, and generative circuit can be such as Fig. 7 b institute
Show.
BPSK modulation can be carried out to the m-sequence that Fig. 7 b is obtained, obtain pilot frequency sequence r (m).
For frequency pilot sign, pilot frequency sequence r (m) is mapped to resource element (k, l), main basis:
ak,l=r (8*l+k) l=0,1
I.e. pilot tone should be mapped to the 0th, 1 OFDM symbol of frame, and r (m) should be mapped from k=0, m=8*l+k with ascending order
Even subcarriers are only used for frequency pilot sign 0 to resource element (k, l), i.e. k takes even number.
Fig. 8, which is shown, can be used for the same of aforementioned high-speed industrial terminal in communication system node device according to the embodiment of the present application
One step process.As previously mentioned, the high-speed industrial communication system includes control equipment and the end node devices, the high speed work
Industry communication system provides OFDM symbol time width different a variety of emission modes.In addition, the high-speed industrial communication system
Physical layer signal frame includes the frame head synchronizing pilot signal of the control device broadcasts, and the frame head synchronizing pilot signal includes connecting
The subcarrier in frequency domain of the synchronous OFDM symbol of continuous two, described two synchronous OFDM symbols loads same pilot sequence, time domain position
Set the subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions in preceding synchronous OFDM symbol.The dress
Setting can be used the mode of software and/or hardware and realizes, and generally can be in integrated electronics.The frame head synchronizing pilot signal can
For pseudo-random sequence.The signal frame of the present embodiment, high-speed industrial communication system, control equipment, target OFDM symbol, frame head resource
The description of front can be referred to by distributing information, synchronous time-frequency domain resources and synchronization sub-carriers etc..
Referring to Fig. 8, the synchronous OFDM symbol of continuous first object and the second target are extracted according to emission mode in S810
Synchronous OFDM symbol, the synchronous OFDM symbol time-domain position of the first object is preceding.As previously mentioned, on frequency domain, the system
It can provide such as four kinds of different emission modes (0,1,2,3).User can select according to the signal-to-noise ratio condition under the conditions of practical application
Select different emission modes.Under corresponding different emission modes, an OFDM symbol time width can be such as 64us respectively,
32us, 16us, 8us.End node devices can extract object synchronization pilot signal according to emission mode.For example, according to energy and
Emission mode extracts object synchronization pilot signal, but the application is without being limited thereto.
In S820, time domain auto-correlation computation is done to the synchronous OFDM symbol of the first object.
First frequency pilot sign frequency domain only has even number or odd subcarriers data, show as in the time domain two sections it is identical
Time-domain signal.Therefore, the autocorrelation performance that can use frequency pilot sign finds signal initial time by time-domain correlated detection,
To carry out time synchronization.
In S830, signal initial time is determined according to the result of the time domain auto-correlation computation.For example, according to the correlation
The related spike result of operation determines signal initial time.
The related spike result of related operation indicates that target OFDM symbol autocorrelation is most strong, the corresponding time location of spike
The as initial time of signal, as shown in Figure 9.
In addition, determining time synchronization estimated value by configuring a variety of relevant calculations, the spirit of time synchronization calculating can be increased
Activity.
According to example embodiment, after determining signal initial time according to the result of the time domain auto-correlation computation, also
It is synchronous with the correlation of the second object synchronization OFDM symbol preliminary clock of progress using the synchronous OFDM symbol of the first object, from
And time synchronization estimated value can be quickly obtained to the scene of time poor synchronization, but precision is lower.
According to example embodiment, the phase of the first object synchronous OFDM symbol and the second object synchronization OFDM symbol is utilized
When putting the preliminary clock of row into and synchronizing including being carried out to the synchronous OFDM symbol of the first object and the second object synchronization OFDM symbol
Domain relevant calculation or frequency domain correlation.
It according to example embodiment, can after determining signal initial time according to the result of the time domain auto-correlation computation
Next synchronous OFDM symbol is obtained, it is related to next synchronous OFDM symbol using the second object synchronization OFDM symbol
It carries out synchronizing finer clock synchronization than preliminary clock.
It according to example embodiment, can after determining signal initial time according to the result of the time domain auto-correlation computation
Obtain and be spaced at least one frame of two synchronous OFDM symbols, using the correlation of described two synchronous OFDM symbols carry out than it is preliminary when
It is synchronous that clock synchronizes finer clock.
The method fuzziness that both the above further synchronizes is poor.Come in fact it is therefore possible to use two methods are used in combination
Current clock is synchronous.
Optionally, determine initial time to complete it is synchronous after, can also include: according to frame resource allocation information,
Determine the data time-frequency domain resources distributed in the signal frame by the end node devices, the data time-frequency domain resources
Positioned at the frame of the signal frame, and for carrying the data-signal and/or pilot signal that the end node devices are sent；?
When detecting that meeting data sends condition, using at least one data subcarrier resource matched with the OFDM data symbol,
Generate OFDM data symbol to be sent；It is sent out in the signal frame at the matched time-domain position of data time-frequency domain resources
Send the OFDM data symbol, wherein the OFDM data symbol is used to indicate the equipment being mounted in the communication system and passes
Transmission of data.
Data time-frequency domain resources can be used for specifying the time-frequency domain resources for carrying valid data, and data time-frequency domain is located at letter
The frame of number frame.Data time-frequency domain resources may include one, two or more continuous OFDM symbol resources.Data time-frequency domain
Resource can be used for specifying any appliance (control equipment or end node devices) in high-speed industrial communication system in a time slot
Under multiple subcarriers for being able to use and each subcarrier to send the type of signal be that data-signal or pilot tone are believed
Number.
Data send condition and send valid data for judging whether, it may include the specified time slot of data time-frequency domain resources with
Present system time matching.Data subcarrier is used for carry data signals or pilot signal.Data-signal includes valid data；It leads
Frequency signal can be used for channel estimating.
Using with the matched data subcarrier of data time-frequency domain resources, generate OFDM data symbol to be sent.It can will make
Matched data subcarrier is modulated with data-signal or pilot signal, and modulated data subcarrier is overlapped, is formed
OFDM data symbol.To which data-signal or pilot tone letter can be demodulated after other equipment receive OFDM data symbol
Number, it is used for subsequent processing.
By configuring frame resource allocation information, any appliance in high-speed industrial communication system is specified to generate data OFDM
Symbol carries valid data, to realize the real-time data transmission of high-speed industrial communication system.
The target OFDM symbol that the embodiment of the present application is sent by end node devices receiving control apparatus, and it is used for the time
It is synchronous, the precision of time synchronization is improved, to realize the real-time Transmission of data.
According to another embodiment, a kind of synchronous method for high-speed industrial communication system is provided, the high-speed industrial is logical
Letter system includes control equipment and the end node devices, and the high-speed industrial communication system provides OFDM symbol time width
Different a variety of emission modes, the synchronous method include: the control device broadcasts frame head synchronizing pilot according to emission mode
Signal, the frame head synchronizing pilot signal include continuous two synchronous OFDM symbols, the frequency of described two synchronous OFDM symbols
Domain subcarrier loads same pilot sequence, the subcarrier in frequency domain zero setting of even number position in the preceding synchronous OFDM symbol of time-domain position
Or the subcarrier in frequency domain zero setting of odd positions.
Therefore, according to embodiment, the application also proposes a kind of frame head structure, is applied to high-speed industrial communication system communication mistake
Physical layer signal frame in journey, including continuous two synchronous OFDM symbol resources, the synchronous OFDM symbol resource is for holding
Carry pilot signal；Wherein, the corresponding pilot frequency sequence to be loaded of described two synchronous OFDM symbol resources is identical, and time-domain position
The subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions in preceding synchronous OFDM symbol resource.
Figure 10 shows the synchronizing device for high-speed industrial terminal in communication system node device according to example embodiment.
The high-speed industrial communication system includes control equipment and the end node devices, and the high-speed industrial communication system provides
The different a variety of emission modes of OFDM symbol time width, the physical layer signal frame of the high-speed industrial communication system include described
The frame head synchronizing pilot signal of device broadcasts is controlled, the frame head synchronizing pilot signal includes continuous two synchronous OFDM symbols
Number, the subcarrier in frequency domain of described two synchronous OFDM symbols loads same pilot sequence, the preceding synchronous OFDM symbol of time-domain position
The subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions in number.The synchronizing device 1000 includes mentioning
Modulus block 1010 extracts the synchronous OFDM symbol of continuous first object and the second object synchronization OFDM symbol, the first object
Synchronous OFDM symbol time-domain position is preceding；Related operation module 1020, when for being done to the synchronous OFDM symbol of the first object
Domain auto-correlation computation；Judgment module 1030, for determining signal initial time according to the result of the time domain auto-correlation computation.Institute
It states device and executes the function similar with method provided above, details are not described herein again.
Figure 11 shows the structural schematic diagram of the network equipment according to the embodiment of the present application.
As shown in figure 11, the network equipment 12 is showed in the form of universal computing device.The component of the network equipment 12 can wrap
Include but be not limited to: one or more processor or processing unit 16, system storage 28 connect different system component (packets
Include system storage 28 and processing unit 16) bus 18.The network equipment 12, which can be, to be articulated in high-speed industrial communication system
Equipment.
Bus 18 indicates one of a few class bus structures or a variety of, including memory bus or Memory Controller,
Peripheral bus, graphics acceleration port, processor or the local bus using any bus structures in a variety of bus structures.It lifts
For example, these architectures include but is not limited to industry standard architecture (Industry
StandardArchitecture, ISA) bus, microchannel architecture (Micro Channel Architecture, MCA)
Bus, enhanced isa bus, Video Electronics Standards Association (Video Electronics Standards Association,
VESA) local bus and peripheral component interconnection (Peripheral Component Interconnect, PCI) bus.
The network equipment 12 typically comprises a variety of machine system readable mediums.These media can be it is any can be by network
The usable medium that equipment 12 accesses, including volatile and non-volatile media, moveable and immovable medium.
System storage 28 may include the machine system readable medium of form of volatile memory, such as arbitrary access is deposited
Reservoir (RAM) 30 and/or cache memory 32.The network equipment 12 may further include other removable/nonremovable
, volatile, nonvolatile machine system storage medium.
Instruction/utility 40 with one group of (at least one) instruction module 42 can store and store in such as system
In device 28, such instruction module 42 include --- but being not limited to --- operating system, one or more application instruction, it is other
It may include the realization of network environment in instruction module and director data, each of these examples or certain combination.Refer to
Module 42 is enabled usually to execute function and/or method in embodiments described herein.
The network equipment 12 can also be with one or more external equipments 14 (such as keyboard, sensing equipment, display 24 etc.)
Communication, can also be enabled a user to one or more equipment interact with the network equipment 12 communicate, and/or with make the net
Any equipment (such as network interface card, modem etc.) that network equipment 12 can be communicated with one or more of the other calculating equipment
Communication.This communication can be carried out by input/output (Input/Output, I/O) interface 22.Also, the network equipment 12 is also
Can by network adapter 20 and one or more network (such as local area network (Local Area Network, LAN), extensively
Domain net (Wide Area Network, WAN) communication.As shown, network adapter 20 passes through bus 18 and the network equipment 12
Other module communications.It should be understood that although being not shown in Figure 11, other hardware and/or soft can be used in conjunction with the network equipment 12
Part module, including but not limited to: microcode, device driver, redundant processing unit, external disk drive array,
(Redundant Arrays of Inexpensive Disks, RAID) system, tape drive and data backup storage system
System etc..
Processing unit 16 by the instruction that is stored in system storage 28 of operation, thereby executing various function application and
Data processing, such as realize synchronous method provided by the application any embodiment.
The application also provides a kind of computer readable storage medium, is stored thereon with computer program, and the program is processed
The step of above method is realized when device executes.Wherein, computer readable storage medium can include but is not limited to any kind of
Disk, including floppy disk, CD, DVD, CD-ROM, mini drive and magneto-optic disk, ROM, RAM, EPROM, EEPROM, DRAM,
VRAM, flash memory device, magnetic or optical card, nanosystems (including molecular memory IC), or be suitable for store instruction and/
Or any kind of medium or equipment of data.
The embodiment of the present application also provides a kind of computer program product, which includes storage computer journey
The non-transient computer readable storage medium of sequence, the computer program are operable to execute computer such as above method implementation
Any one recorded in example is for some or all of wide-angle lens 3D distortion correction method step.
Those skilled in the art can be understood that the technical solution of the application can be come by software and/or hardware
It realizes." unit " and " module " in this specification refers to complete independently or cooperates with other component complete specific function
Software and/or hardware, wherein hardware for example can be field programmable gate array (Field-ProgrammaBLE Gate
Array, FPGA), integrated circuit (Integrated Circuit, IC) etc..
It should be noted that for the various method embodiments described above, for simple description, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the application is not limited by the described action sequence because
According to the application, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, related actions and modules not necessarily the application
It is necessary.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed device, it can be by another way
It realizes.For example, the apparatus embodiments described above are merely exemplary, such as the division of the unit, it is only a kind of
Logical function partition, there may be another division manner in actual implementation, such as multiple units or components can combine or can
To be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit,
It can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer-readable access to memory.Based on this understanding, the technical solution of the application substantially or
Person says that all or part of the part that contributes to existing technology or the technical solution can body in the form of software products
Reveal and, which is stored in a memory, including some instructions are used so that a computer equipment
(can be personal computer, server or network equipment etc.) executes all or part of each embodiment the method for the application
Step.And memory above-mentioned includes: USB flash disk, read-only memory (Read-Only Memory, ROM), random access memory
The various media that can store program code such as (Random Access Memory, RAM), mobile hard disk, magnetic or disk.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can store in a computer-readable memory, memory
It may include: flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access
Memory, RAM), disk or CD etc..
As described above, the only exemplary embodiment of the disclosure cannot limit the scope of the present disclosure with this.I.e. in every case according to
The disclosure instruct made by equivalent changes and modifications, all still belong in the range of the disclosure covers.Those skilled in the art are considering
Specification and after practicing disclosure herein, will readily occur to other embodiments of the disclosure.This application is intended to cover the disclosure
Any variations, uses, or adaptations, the generality that these variations, uses, or adaptations follow the disclosure is former
The common knowledge or conventional techniques in the art managed and do not recorded including the disclosure.Description and embodiments only by
It is considered as illustratively, the scope of the present disclosure and spirit are defined by the claims.
Claims (13)
1. a kind of synchronous method for high-speed industrial terminal in communication system node device, which is characterized in that the high speed work
Industry communication system includes control equipment and the end node devices, and the high-speed industrial communication system provides the OFDM symbol time
A variety of emission modes of different size, the physical layer signal frame of the high-speed industrial communication system include the control device broadcasts
Frame head synchronizing pilot signal, the frame head synchronizing pilot signal includes continuous two synchronous OFDM symbols, described two same
The subcarrier in frequency domain for walking OFDM symbol loads same pilot sequence, even number position in the preceding synchronous OFDM symbol of time-domain position
Subcarrier in frequency domain zero setting or the subcarrier in frequency domain zero setting of odd positions, the synchronous method include:
According to emission mode, the synchronous OFDM symbol of continuous first object and the second object synchronization OFDM symbol are extracted, described the
One object synchronization OFDM symbol time-domain position is preceding；
Time domain auto-correlation computation is done to the synchronous OFDM symbol of the first object；
Signal initial time is determined according to the result of the time domain auto-correlation computation.
2. synchronous method according to claim 1, which is characterized in that true in the result according to the time domain auto-correlation computation
After determining signal initial time, further includes:
It is synchronous with the correlation of the second object synchronization OFDM symbol preliminary clock of progress using the synchronous OFDM symbol of the first object.
3. synchronous method according to claim 2, which is characterized in that described to utilize the synchronous OFDM symbol of the first object
It is synchronous that preliminary clock is carried out with the correlation of the second object synchronization OFDM symbol, comprising:
Time domain relevant calculation or frequency domain phase are carried out to the synchronous OFDM symbol of the first object and the second object synchronization OFDM symbol
Close operation.
4. synchronous method according to claim 1, which is characterized in that true in the result according to the time domain auto-correlation computation
After determining signal initial time, further includes:
Next synchronous OFDM symbol is obtained, the second object synchronization OFDM symbol and next synchronous OFDM symbol are utilized
It is synchronous that correlation carries out fine clock.
5. synchronous method according to claim 1, which is characterized in that true in the result according to the time domain auto-correlation computation
After determining signal initial time, further includes:
It obtains and is spaced at least one frame of two synchronous OFDM symbols, related using described two synchronous OFDM symbols carries out finely
Clock is synchronous.
6. synchronous method according to claim 1, which is characterized in that the result according to the time domain auto-correlation computation
Determine signal initial time, comprising:
Signal initial time is determined according to the related spike result of time domain auto-correlation computation.
7. synchronous method according to claim 1 to 6, which is characterized in that the frame head synchronizing pilot signal is
Pseudo-random sequence.
8. a kind of synchronous method for high-speed industrial communication system, which is characterized in that the high-speed industrial communication system includes
Control equipment and the end node devices, the high-speed industrial communication system provides OFDM symbol time width different a variety of
Emission mode, the synchronous method include:
According to emission mode, the control device broadcasts frame head synchronizing pilot signal, the frame head synchronizing pilot signal includes connecting
The subcarrier in frequency domain of the synchronous OFDM symbol of continuous two, described two synchronous OFDM symbols loads same pilot sequence, time domain position
Set the subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions in preceding synchronous OFDM symbol.
9. a kind of frame head structure, which is characterized in that applied to the signal frame in the communication process of high-speed industrial communication system, packet
It includes:
Continuous two synchronous OFDM symbol resources, the synchronous OFDM symbol resource is for carrying pilot signal；
Wherein, the corresponding pilot frequency sequence to be loaded of described two synchronous OFDM symbol resources is identical, and time-domain position is preceding
The subcarrier in frequency domain zero setting of even number position or the subcarrier in frequency domain zero setting of odd positions in synchronous OFDM symbol resource.
10. frame head structure according to claim 9, which is characterized in that the pilot signal is pseudo-random sequence.
11. a kind of synchronizing device for high-speed industrial terminal in communication system node device, which is characterized in that the high speed work
Industry communication system includes control equipment and the end node devices, and the high-speed industrial communication system provides the OFDM symbol time
A variety of emission modes of different size, the physical layer signal frame of the high-speed industrial communication system include the control device broadcasts
Frame head synchronizing pilot signal, the frame head synchronizing pilot signal includes continuous two synchronous OFDM symbols, described two same
The subcarrier in frequency domain for walking OFDM symbol loads same pilot sequence, even number position in the preceding synchronous OFDM symbol of time-domain position
Subcarrier in frequency domain zero setting or the subcarrier in frequency domain zero setting of odd positions, the synchronizing device include:
Extraction module, for extracting the synchronous OFDM symbol of continuous first object and the second object synchronization according to emission mode
OFDM symbol, the synchronous OFDM symbol time-domain position of the first object is preceding；
Related operation module, for doing time domain auto-correlation computation to the synchronous OFDM symbol of the first object；
Determination module, for determining signal initial time according to the result of the time domain auto-correlation computation.
12. a kind of network equipment including memory, processor and stores the finger that can be executed on a memory and on a processor
It enables, which is characterized in that the processor realizes such as synchronous method described in any one of claims 1-8 when executing described instruction.
13. a kind of machine readable storage medium, is stored thereon with computations, which is characterized in that the computations are by processor
Such as synchronous method described in any one of claims 1-8 is realized when execution.
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| CN112468425A (en) * | 2019-09-09 | 2021-03-09 | 北京东土科技股份有限公司 | Frame header structure and system time synchronization method |
| CN112469126A (en) * | 2019-09-09 | 2021-03-09 | 北京东土科技股份有限公司 | Real-time communication method, device, computer equipment and storage medium |
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| CN112491445B (en) * | 2019-09-12 | 2022-09-20 | 北京东土科技股份有限公司 | Industrial control bus signal-to-noise ratio calculation method |
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| CN112543085A (en) * | 2019-09-23 | 2021-03-23 | 北京东土科技股份有限公司 | Method, device, equipment and storage medium for selecting subcarriers for transmission |
| CN112583676B (en) * | 2019-09-27 | 2022-05-17 | 北京东土科技股份有限公司 | Information transmission method |
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