CN110336766A - Time granularity selection method in high-speed industrial communication system based on ofdm communication system - Google Patents
Time granularity selection method in high-speed industrial communication system based on ofdm communication system Download PDFInfo
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- CN110336766A CN110336766A CN201910606581.6A CN201910606581A CN110336766A CN 110336766 A CN110336766 A CN 110336766A CN 201910606581 A CN201910606581 A CN 201910606581A CN 110336766 A CN110336766 A CN 110336766A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L27/26—Systems using multi-frequency codes
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Abstract
This application provides in the high-speed industrial communication system based on ofdm communication system time granularity selection method and device, based on high-speed industrial communication system, electronic equipment and the storage medium of ofdm communication system.The above method includes: to determine the length of the OFDM symbol according to the demand parameter of the high-speed industrial communication system；Length based on the OFDM symbol, in the case that OFDM symbol in the ofdm communication system has fixed-bandwidth in a frequency domain, the number that subcarrier included in each OFDM symbol in the ofdm communication system is selected in different numerical value, using the length of formation and the matched OFDM symbol of the demand parameter as the time granularity.High-speed industrial communication system of the present invention is mainly used to solve the problems, such as industry spot conventional bus low bandwidth, can not carry the real-time and non real-time and complicated network structure simultaneously, high-speed industrial communication system can support IPV6 address communication, it can support the industrial control communication of time trigger, it can support TSN, can support the security mechanisms such as white list, depth detection and data encryption.
Description
Technical field
The application belongs to high-speed industrial field of wireless communications, is related to a kind of high-speed industrial communication based on ofdm communication system
Time granularity selection method and device in system, the high-speed industrial communication system based on ofdm communication system, electronic equipment and
Storage medium.
Background technique
Existing high-speed industrial communication system is broadly divided into two classes, and one is with CAN (Controller Area
Network, controller local area network) bus be representative field high-speed industrial communication systems, transmission rate is lower, about
10kbps~1Mbps, therefore the real-time of data transmission is poor.
Another high-speed industrial communication system is real-time industrial ethernet fieldbus, when its list net node is more, meeting
There is data congestion phenomenon, the real-time for also resulting in data transmission is poor.Although can introduce interchanger within the system carries out bridge
It connects, to reduce the real-time of data congestion phenomenon and improve data transfer, but so, network topology structure will become complicated
And higher cost.Therefore, existing high-speed industrial communication system can not have high real-time in remote, high rate data transmission.
Summary of the invention
In order to solve the above problem occurred in the prior art, this application provides a kind of height based on ofdm communication system
Time granularity selection method in fast industrial communication systems, comprising:
According to the demand parameter of the high-speed industrial communication system, the length of the OFDM symbol is determined；
Based on the length of the OFDM symbol, the OFDM symbol in the ofdm communication system has fixation in a frequency domain
In the case where bandwidth, son included in each OFDM symbol in the ofdm communication system is selected to carry in different numerical value
The number of wave, using the length of formation and the matched OFDM symbol of the demand parameter as the time granularity.
According to one embodiment, the above method further include:
Based on the variation of the demand parameter, the length of the OFDM symbol is redefined；
Based on the length of the OFDM symbol redefined, institute in the OFDM symbol in the ofdm communication system is adjusted
The number for the subcarrier for including.
According to one embodiment, the length of subcarrier and the OFDM symbol included in the OFDM symbol meets
Following formula:
Subcarrier spacing × subcarrier number=fixed-bandwidth.
According to one embodiment, the demand parameter includes the data volume to be sent in the high-speed industrial communication system
And/or the maximum transmission distance of the high-speed industrial communication system.
According to one embodiment, each OFDM symbol in the ofdm communication system includes cyclic prefix, each
The length ratio that the cyclic prefix of OFDM symbol accounts for the OFDM symbol is identical.
According to one embodiment, each frame in the ofdm communication system is included OFDM symbol number and
Pilot configuration immobilizes.
According to one embodiment, of the length of the OFDM symbol and subcarrier included in the OFDM symbol
The directly proportional variation of number.
According to one embodiment, the length of the OFDM symbol is with a of subcarrier included in the OFDM symbol
Number is with the multiple variation of 2 integral number power.
According to the another aspect of the application, provide in a kind of high-speed industrial communication system based on ofdm communication system
Time granularity selection device, comprising:
Determination unit determines the length of the OFDM symbol according to the demand parameter of the high-speed industrial communication system；
Selecting unit, based on the length of the OFDM symbol, the OFDM symbol in the ofdm communication system is in frequency domain
In have fixed-bandwidth in the case where, institute in each OFDM symbol in the ofdm communication system is selected in different numerical value
The number for the subcarrier for including, using the length of formation and the matched OFDM symbol of the demand parameter as the time granularity.
According to the another aspect of the application, a kind of high-speed industrial communication system based on ofdm communication system is provided, is wrapped
Include time granularity selection device as described above.
According to the another aspect of the application, a kind of electronic equipment is provided, comprising:
Processor；
Memory connect with the processor communication, and is stored with computer instruction, when the computer instruction is described
When processor executes, so that the processor executes method as described above.
According to the application's in another aspect, providing a kind of non-transient computer readable storage medium, it is stored with calculating
Machine instruction, when the computer instruction is executed by processor, so that the processor executes method as described above.
For the problem in the prior art, the high-speed industrial communication system provided by the present application based on ofdm communication system
Time granularity selection method in system can realize that variable time granularity designs in high-speed industrial communication system, to meet difference
Different demands under scene, including the demand to communications real-time, flexibility and transmission range.High speed work of the present invention
Industry communication system is mainly used to solve industry spot conventional bus low bandwidth, can not carry real-time and non real-time and network simultaneously
The problem of structure is complicated, high-speed industrial communication system support IPV6 address communication, support the industrial control communication of time trigger, prop up
TSN is held, supports the security mechanisms such as white list, depth detection and data encryption.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is shown according to one embodiment of the application based in the high-speed industrial communication system of ofdm communication system
The flow chart of time granularity selection method.
The schematic diagram of the OFDM symbol for being included Fig. 2 shows a frame in ofdm communication system in the time domain.
Fig. 3 shows structural schematic diagram of the OFDM symbol on frequency domain in ofdm communication system.
Fig. 4 shows the schematic diagram of time granularity under different mode in ofdm communication system.
Fig. 5 is shown according to another embodiment herein based in the high-speed industrial communication system of ofdm communication system
Time granularity selection device schematic diagram.
Specific embodiment
The technical solution and advantage of the application in order to better understand, in the following with reference to the drawings and specific embodiments to the application
Content be described in further details.But specific embodiment described herein only to explain the application, is not used to limit
The application.In addition, technical characteristic involved in each embodiment of the application discussed below is except composition conflict each other
Except in the case of can be applied in combination, to constitute the other embodiments within the scope of the application.
Present applicant proposes orthogonal frequency division multiplexing (Orthogonal is introduced in the communication of high-speed industrial communication system
Frequency Division Multiplexing；Abridge OFDM) communication system.It can be realized high speed by frequency division multiplexing to go here and there
The parallel transmission of row data, the ability that it has preferable anti-multipath weak, can support multiple access.OFDM technology is more
One of implementation of carrier transmission scheme, its modulation and demodulation are to be based respectively on IFFT (Inverse Fast Fourier
Transform；Inverse fast Fourier transform) and FFT (Fast Fourier Transform；Fast Fourier Transform (FFT)) Lai Shixian
, be implementation complexity it is lower, using a kind of wider multi-carrier transmission scheme.
By time-frequency resource allocating to user by the way of time-frequency multiplexing, in the premise for not increasing structure complexity and cost
Under, enable to high-speed industrial communication system that there is high real-time and flexible dispatching in remote, high rate data transmission.
Fig. 1 is shown according to one embodiment of the application based in the high-speed industrial communication system of ofdm communication system
The flow chart of time granularity selection method.As shown in Figure 1, this method 100 includes step S110 and S120.In step s 110,
According to the demand parameter of high-speed industrial communication system, the length of OFDM symbol is determined.In high-speed industrial communication system, have more
A node (that is, usually said user or node device).Each node is in the high-speed industrial communication system applications scene
In a specific equipment, for example, sensor, camera, detector, mobile terminal etc..For different node devices, meeting
There are different data transfer demands, for example, the distance that the requirement to communication response time with real-time is different, data are transmitted is not
The data volume difference etc. of same, required transmission.Therefore, in high-speed industrial communication system, different node devices can all have
There is demand parameter.The demand parameter, which can be, to be preset in node device, and it is real in operation to be also possible to node device
Shi Gengxin's, it can also be and be manually entered by node device, or detected by other instruments or equipment.
In high-speed industrial communication system of the application using ofdm communication system, time granularity is an OFDM symbol,
And in order to adapt to the demand of different node devices, the length of the OFDM symbol is variable, that is, is determined based on demand parameter
's.
In the step s 120, based on the length of OFDM symbol, the OFDM symbol in ofdm communication system has in a frequency domain
In the case where having fixed-bandwidth, son included in each OFDM symbol in ofdm communication system is selected in different numerical value
The number of carrier wave, using the length of formation and the matched OFDM symbol of demand parameter as time granularity.In ofdm communication system,
The number of the subcarrier as included in the length and OFDM symbol of OFDM symbol has incidence relation, the length of OFDM symbol
It is number determination through IFFT of subcarrier included in OFDM symbol.Therefore, when OFDM has been determined in step s 110
After the length of symbol, the number of subcarrier included in OFDM symbol can be selected in different numerical value.Having selected OFDM
After the number of subcarrier included in symbol, the length with the matched OFDM symbol of demand parameter can be formed.As described above,
In high-speed industrial communication system of the application using ofdm communication system, an OFDM symbol is time granularity.
In addition, the OFDM symbol in ofdm communication system has fixing belt in a frequency domain in the technical solution of the application
Width, this is also that the application selects a premise of time granularity to impose a condition.
Under the precondition that the OFDM symbol in ofdm communication system has fixed-bandwidth in a frequency domain, accorded with based on OFDM
Number length, can be selected in different numerical value subcarrier included in each OFDM symbol in ofdm communication system
Number.Before practical operation, it can be preset a lot of according to the concrete application scene and possible demand of high-speed industrial communication system
A numerical value can be used as the number of subcarrier included in OFDM symbol.And specifically need which is selected in actual operation
Number of the numerical value as subcarrier included in OFDM symbol then needs to be selected according to the length of OFDM symbol.Selected
After the number of subcarrier included in OFDM symbol, the length with the matched OFDM symbol of demand parameter can be formed, with
As time granularity.
Orthogonal frequency division multiplexing (OFDM) communication system is introduced in high-speed industrial communication system communication as a result, it can be achieved that height
Variable time granularity designs in fast industrial communication systems, thus the different demands under meeting different scenes, including communication is passed
Defeated real-time, the demand of flexibility and transmission range.
The schematic diagram of the OFDM symbol for being included Fig. 2 shows a frame in ofdm communication system in the time domain.Such as Fig. 2 institute
Show, in the time domain, a frame is made of Nsym OFDM symbol, i.e., symbol 0, symbol 1, symbol 2, symbol 3 ... are until symbol
The length of Nsym-1, each OFDM symbol are Tsym, and frame length Tf, an OFDM symbol is the minimum unit in frame structure,
Therefore it is time granularity.
Fig. 3 shows structural schematic diagram of the OFDM symbol on frequency domain in ofdm communication system.As shown in figure 3,
In frequency domain, an OFDM symbol is made of Nc subcarrier.As described above, in this application, an OFDM symbol is in a frequency domain
Bandwidth immobilize.In ofdm communication system, the length of subcarrier and OFDM symbol included in OFDM symbol meets
Following formula:
Subcarrier spacing δ f × subcarrier number Nc=bandwidth B.
Since bandwidth immobilizes, subcarrier spacing δ f and subcarrier number Nc change in inverse ratio.And according to this Shen
Please, the other parameters in OFDM frame structure immobilize.For example, the OFDM symbol number Nsym of a frame is constant, pilot configuration is not
Become.
According to one embodiment of the application, this method 100 may also include that the variation based on demand parameter, redefine
The length of OFDM symbol；And based on the length of the OFDM symbol redefined, adjust the OFDM symbol in ofdm communication system
Included in subcarrier number.In actual operation, the node device in high-speed industrial communication system is likely due to send out
It gives birth to replacement or other reasons and its demand parameter is made to change.When demand parameter variation, can be redefined based on the variation
The length of OFDM symbol, and based on subcarrier included in the OFDM symbol in the length adjustment ofdm communication system
Number, to meet updated communication transmission needs, to realize the adaptive adjustment of system.
According to one embodiment of the application, the demand parameter may include the number to be sent in high-speed industrial communication system
According to the maximum transmission distance of amount and/or high-speed industrial communication system.The transmission range of high-speed industrial communication system is remoter, multipath
It is delayed also bigger, and the cyclic redundancy of longer OFDM symbol is longer, can fight bigger multipath delay.Longer OFDM
Symbol can carry more data, same data volume, and longer OFDM symbol is able to use the modulation system of more low order, has
Lower demodulation threshold.Under the same conditions, shorter OFDM symbol makes each user (that is, node device) to occupy bus
Time is shorter.Therefore, longer OFDM symbol mode is suitable for transmission range farther out, to communication response time and requirement of real-time
Slightly lower application scenarios；Shorter OFDM symbol mode is suitable for short distance, the applied field that the communication response time is fast, real-time is high
Scape.
According to one embodiment of the application, the demand parameter includes that user inputs parameter and/or parameter preset.In reality
In the operation of border, user (that is, node device) is allowed to input demand parameter in real time, and/or can also be pre- in node device
Equipped with demand parameter, to be used in step S110, so that the design of variable time granularity can be realized.
According to one embodiment of the application, each OFDM symbol in ofdm communication system includes cyclic prefix, often
The length ratio that the cyclic prefix of a OFDM symbol accounts for OFDM symbol is identical.As a result, due to the cyclic prefix of each OFDM symbol
The length ratio for accounting for OFDM symbol is identical, thus under different OFDM symbol long patterns, stored in OFDM symbol to
Data are sent to be positively correlated with OFDM symbol length.That is, OFDM symbol length is bigger, the data to be sent stored in OFDM symbol
It is more.To which parameter determines that the length of OFDM symbol just has practical significance according to demand in step s 110.
According to one embodiment of the application, the number of subcarrier included in the length and OFDM symbol of OFDM symbol
Directly proportional variation, this is determined by IFFT relationship between the two in ofdm communication system.According to one embodiment, OFDM
The length of symbol is changed with the number of subcarrier included in OFDM symbol with the multiple of 2 integral number power.For example, default
Mode in, the number Nc of subcarrier included in an OFDM symbol can be respectively 256,512,1024 etc.
Deng.
Fig. 4 shows the schematic diagram of time granularity under different mode in ofdm communication system.As shown in figure 4, a frame includes
64 OFDM symbols, there are two types of can match mode: mode 0 and mode 1.The bandwidth of the OFDM symbol of both of which in a frequency domain is not
Become, the parameter constants such as structure of pilot tone.The subcarrier spacing δ f and number Nc of mode 1 are 2 times and 1/2 times of mode 0 respectively.Mould
The OFDM symbol length of formula 0 is 62.5 μ s, and the OFDM symbol length of mode 1 is 31.25 μ s, i.e. the 1/2 of mode 0 times.It is transmitting
In the case that distance is less than 300m, it is desirable that mode 1 can be used in the scene that the communication response time is fast, real-time is high.In transmission range
More than or equal to 300m, mode 0 can be used to the scene that communication response time and requirement of real-time are slightly lower.
Fig. 5 is shown according to another embodiment herein based in the high-speed industrial communication system of ofdm communication system
Time granularity selection device schematic diagram.As shown in figure 5, device 200 may include determination unit 210 and selecting unit 220.Really
Order member 210 determines the length of the OFDM symbol according to the demand parameter of the high-speed industrial communication system.Selecting unit
220 length based on the OFDM symbol, the OFDM symbol in the ofdm communication system have fixed-bandwidth in a frequency domain
In the case where, subcarrier included in each OFDM symbol in the ofdm communication system is selected in different numerical value
Number, using the length of formation and the matched OFDM symbol of the demand parameter as the time granularity.
According to another embodiment herein, a kind of high-speed industrial communication system based on ofdm communication system is provided,
The system includes time granularity selection device as described above.
According to another embodiment herein, a kind of electronic equipment is provided, which may include communicatively connected to each other
Processor and memory, the memory are stored with computer instruction, when the computer instruction is executed by processor, so that at this
It manages device and executes method as described above.
According to another embodiment herein, a kind of non-transient computer readable storage medium is provided, is stored thereon
There is computer instruction, when the computer instruction is executed by processor, so that the processor executes method as described above.
It should be noted that each embodiment above by reference to described in attached drawing is only to illustrate the application rather than limits this
The range of application, those skilled in the art should understand that, it is right under the premise of not departing from spirit and scope
The modification or equivalent replacement that the application carries out, should all cover within the scope of the present application.In addition, signified unless the context
Outside, the word occurred in the singular includes plural form, and vice versa.In addition, unless stated otherwise, then any embodiment
All or part of in combination with any other embodiment all or part of come using.
Claims (12)
1. the time granularity selection method in a kind of high-speed industrial communication system based on ofdm communication system, comprising:
According to the demand parameter of the high-speed industrial communication system, the length of the OFDM symbol is determined；
Based on the length of the OFDM symbol, the OFDM symbol in the ofdm communication system has fixed-bandwidth in a frequency domain
In the case where, subcarrier included in each OFDM symbol in the ofdm communication system is selected in different numerical value
Number, using the length of formation and the matched OFDM symbol of the demand parameter as the time granularity.
2. according to the method described in claim 1, further include:
Based on the variation of the demand parameter, the length of the OFDM symbol is redefined；
Based on the length of the OFDM symbol redefined, adjust included in the OFDM symbol in the ofdm communication system
Subcarrier number.
3. according to the method described in claim 1, wherein subcarrier and the OFDM symbol included in the OFDM symbol
Length meet following formula:
Subcarrier spacing × subcarrier number=fixed-bandwidth.
4. according to the method described in claim 1, wherein the demand parameter include in the high-speed industrial communication system to
Send the maximum transmission distance of data volume and/or the high-speed industrial communication system.
5. according to the method described in claim 1, wherein each OFDM symbol in the ofdm communication system includes circulation
Prefix, the length ratio that the cyclic prefix of each OFDM symbol accounts for the OFDM symbol are identical.
6. according to the method described in claim 1, the OFDM symbol that wherein each frame in the ofdm communication system is included
Number number and pilot configuration immobilize.
7. according to the method described in claim 1, wherein
The variation directly proportional to the number of subcarrier included in the OFDM symbol of the length of the OFDM symbol.
8. according to the method described in claim 1, wherein
The length of the OFDM symbol is with the number of subcarrier included in the OFDM symbol with the multiple of 2 integral number power
Variation.
9. the time granularity selection device in a kind of high-speed industrial communication system based on ofdm communication system, comprising:
Determination unit determines the length of the OFDM symbol according to the demand parameter of the high-speed industrial communication system；
Selecting unit, based on the length of the OFDM symbol, the OFDM symbol in the ofdm communication system has in a frequency domain
In the case where having fixed-bandwidth, selected in different numerical value included in each OFDM symbol in the ofdm communication system
Subcarrier number, to be formed with the length of the matched OFDM symbol of the demand parameter as the time granularity.
10. a kind of high-speed industrial communication system based on ofdm communication system, including time granularity as claimed in claim 9 choosing
Select device.
11. a kind of electronic equipment, comprising:
Processor；
Memory connect with the processor communication, and is stored with computer instruction, when the computer instruction is by the processing
When device executes, so that the processor executes method as claimed in any one of claims 1-9 wherein.
12. a kind of non-transient computer readable storage medium, is stored with computer instruction, when the computer instruction is processed
When device executes, so that the processor executes such as method of any of claims 1-8.
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Cited By (1)
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| CN112839000A (en) * | 2020-12-30 | 2021-05-25 | 北京神经元网络技术有限公司 | High-speed industrial bus system with variable symbol bandwidth and method for changing symbol bandwidth |
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