CN112491445B - Industrial control bus signal-to-noise ratio calculation method - Google Patents

Industrial control bus signal-to-noise ratio calculation method Download PDF

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CN112491445B
CN112491445B CN201910867078.6A CN201910867078A CN112491445B CN 112491445 B CN112491445 B CN 112491445B CN 201910867078 A CN201910867078 A CN 201910867078A CN 112491445 B CN112491445 B CN 112491445B
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signal
pilot
noise ratio
signal frame
zero
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CN112491445A (en
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王欣海
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Kyland Technology Co Ltd
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Kyland Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • 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
    • H04L27/261—Details of reference signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention discloses a method for calculating the signal-to-noise ratio of an industrial control bus, which is applied to a signal frame, wherein the signal frame comprises allocable resources, the allocable resources comprise pilot symbols of user node subframes, and the method comprises the following steps: determining a pilot frequency symbol of a user node subframe according to a pilot frequency sequence; setting effective subcarriers in the pilot symbols to zero or non-zero; and generating and transmitting a signal frame according to the pilot symbols, and determining the signal-to-noise ratio according to the effective subcarriers in the signal frame. The signal-to-noise ratio can be calculated by carrying out the way of completely or partially setting zero on the effective subcarriers in the signal frame, and the resource utilization rate is improved.

Description

Industrial control bus signal-to-noise ratio calculation method
Technical Field
The embodiment of the invention relates to a communication technology, in particular to a method for calculating the signal-to-noise ratio of an industrial control bus.
Background
At present, buses such as CAN, BUS and the like are adopted for BUS transmission, but data transmitted by the buses are data formed by 0 and 1 generally, the signal-to-noise ratio cannot be directly calculated, and the resource utilization rate is low.
Disclosure of Invention
The invention provides a method for calculating the signal-to-noise ratio of an industrial control bus, which is used for calculating the signal-to-noise ratio according to a signal frame and improving the resource utilization rate.
In a first aspect, an embodiment of the present invention provides a method for calculating a signal-to-noise ratio of an industrial control bus, where the method is applied to a signal frame, the signal frame includes allocable resources, and the allocable resources include pilot symbols of subframes of user nodes, and the method includes:
determining a pilot frequency symbol of a user node subframe according to a pilot frequency sequence;
setting effective subcarriers in the pilot symbols to zero or non-zero;
and generating and transmitting a signal frame according to the pilot symbols, and determining the signal-to-noise ratio according to the effective subcarriers in the signal frame.
In a second aspect, an embodiment of the present invention further provides an industrial control bus signal-to-noise ratio calculation apparatus, where the method is applied to a signal frame, where the signal frame includes allocable resources, and the allocable resources include pilot symbols of user node subframes, and the method includes:
the user pilot frequency symbol determining module is used for determining the pilot frequency symbol of the user node subframe according to the pilot frequency sequence;
a zero setting module, configured to set a zero or non-zero to an effective subcarrier in the pilot symbol;
a signal frame generating module for generating a signal frame according to the pilot symbol;
and the signal-to-noise ratio calculation module is used for transmitting the signal frame and determining the signal-to-noise ratio according to the effective subcarriers in the signal frame.
In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for calculating the signal-to-noise ratio of the industrial control bus according to the first aspect.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the industrial control bus signal-to-noise ratio calculation method as shown in the first aspect.
The industrial control bus signal-to-noise ratio calculation method provided by the embodiment of the invention determines the pilot symbols of the user node sub-frames according to the pilot sequence; setting effective subcarriers in the pilot symbols to zero or non-zero; the signal frame is generated and transmitted according to the pilot symbols, the signal-to-noise ratio is determined according to the effective subcarriers in the signal frame, the signal-to-noise ratio can be calculated in a mode of carrying out complete or partial zero setting on the effective subcarriers in the signal frame, and the resource utilization rate is improved.
Drawings
FIG. 1 is a flow chart of a method for calculating a signal-to-noise ratio of an industrial control bus according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for calculating signal-to-noise ratio of an industrial control bus in an embodiment of the invention;
FIG. 3 is a schematic view of a computational model in an embodiment of the invention;
FIG. 4 is a flow chart of another method for calculating signal-to-noise ratio of an industrial control bus in an embodiment of the invention;
FIG. 5 is a schematic structural diagram of an industrial control bus SNR calculation apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a method for calculating an industrial control bus signal-to-noise ratio by Orthogonal Frequency Division Multiplexing (OFDM) modulation according to an embodiment of the present invention, where the embodiment is applicable to the case of calculating an industrial bus signal-to-noise ratio, the method may be executed by an electronic device for calculating a signal-to-noise ratio, where the electronic device may be a personal computer, a mobile terminal, a server, or the like, and the method provided by the embodiment of the present invention is applied to a process of transmitting a signal frame. In the high-speed industrial control bus communication system, the basic unit of a system physical layer signal is an OFDM symbol, and 64 OFDM symbols form a signal frame. Each OFDM symbol is equally divided into an upper half sub-band and a lower half sub-band on a frequency domain sub-carrier, and when a high-speed industrial control bus communication system distributes channel resources, the upper sub-band and the lower sub-band can be distributed to different equipment nodes. The signal frame decomposable elements of the high-speed industrial control bus comprise: frame header pilot signals, downlink subframes, allocable resources and the like. The allocable resource is composed of pilot symbols of the user node sub-frame and data symbols of the user node, and the signal-to-noise ratio can be estimated according to the zero setting data and the non-zero setting data carried in the pilot symbols. The pilot signal of the user node sub-frame is fixed in the sub-band part of the 1 st symbol of the sub-frame (uplink sub-frame or downlink sub-frame). The method specifically comprises the following steps:
and step 110, determining a pilot symbol of the user node subframe according to the pilot sequence.
The pilot sequence may be calculated according to a preset formula when determining the pilot symbols, and the specific calculation process is described in the following embodiments. The pilot sequence may also be a pre-calculated inherent sequence. A pilot sequence may be used to determine multiple pilot symbols, which may be pilot symbols in multiple signal frames for the same user. The pilot symbol is an excerpt in the pilot sequence. The data field of the same length may be truncated from the pilot sequence as the pilot symbols according to the length of the pilot symbols.
And step 120, setting the effective subcarriers in the pilot symbols to zero or non-zero.
In one implementation, some of the active subcarriers in the pilot symbols are set to zero, and another portion of the active subcarriers in the pilot symbols are set to non-zero.
When calculating the signal-to-noise ratio, the signal-to-noise ratio needs to be calculated according to the powers of the nulled position and the non-nulled position. The embodiment of the invention provides a method for configuring zero setting of partial effective subcarriers in a pilot symbol, and further calculating the signal-to-noise ratio according to the power of the zero set effective subcarriers and the non-zero set effective subcarriers in the pilot symbol. Some effective subcarriers in the pilot symbols may be intermittently set to zero, and the remaining effective subcarriers are non-zero.
Illustratively, the effective subcarriers contained in the pilot symbols are divided into N effective subcarrier groups; in each effective sub-carrier grouping, the number of the effective sub-carriers with zero setting accounts for 1/M of the total number of the effective sub-carriers in the effective sub-carrier grouping.
Wherein N is an integer power of 2. Wherein M is an integer of 2 or more. Alternatively, M may be an integer greater than 2 and M is an integer power of 2 to simplify the calculation.
N may be 1, 2, 4, 8, etc. In the obtained N groups of effective subcarrier groups, the number of the effective subcarriers with zeros contained in each group of effective subcarrier groups is 1/M of the total number of the effective subcarriers contained in each group. When M is 2, 50% of the active subcarriers in the active subcarrier group are set to zero, and 50% of the active subcarriers are non-zero. When M is 4, 25% of the active subcarriers in the active subcarrier group are set to zero, and 75% of the active subcarriers are non-zero. The number of non-zero effective subcarriers spaced between the effective subcarriers to be zeroed can be determined according to M, and then the effective subcarriers to be zeroed are sequentially determined according to the number of the non-zero effective subcarriers spaced between the effective subcarriers to be zeroed.
Further, in each effective subcarrier group, the zero-set effective subcarriers are randomly configured.
For the same user or different users, after grouping to obtain a plurality of effective subcarrier groups, the position of the effective subcarrier with zero in each effective subcarrier group is random. That is, the positions of the nulled effective subcarriers are different among the effective subcarrier groups, so that the frame synchronization of the interference signal can be avoided.
In another implementation, all the effective subcarriers in the pilot symbols are set to zero; or all effective subcarriers in the pilot symbols are set to be nonzero.
At a receiving end, respectively counting the power of non-zero subcarriers and zero-set subcarriers, wherein for the part of the non-zero subcarriers, the counted power of signals containing noise interference is the power of the signals containing the noise interference; for the zero-setting subcarrier part, the signal power is zero due to zero setting, and the statistic is the noise power. The signal power and the noise power are calculated to obtain the signal-to-noise ratio of the channel, namely the signal-to-noise ratio from the user node to the receiving node.
Step 130, generating and transmitting a signal frame according to the pilot symbols, and determining a signal-to-noise ratio according to effective subcarriers in the signal frame.
In one implementation, a first signal frame is generated and transmitted according to pilot symbols, a signal-to-noise ratio is calculated according to a first power of a null-set effective subcarrier and a second power of a non-null effective subcarrier in the first signal frame, a part of effective subcarriers in the pilot symbols of the first signal frame are set to be null, and another part of effective subcarriers in the pilot symbols are set to be non-null.
And configuring the effective subcarriers with zero in the pilot symbols to obtain a signal frame. After a sending end sends a signal frame to a receiving end, the receiving end reads first power of a null-set effective subcarrier in a pilot symbol of a user node subframe in the signal frame and second power of an effective subcarrier which is not null-set in the pilot symbol of the user subframe. A signal-to-noise ratio is estimated based on the first power and the second power.
In another implementation mode, all effective subcarriers in the pilot symbols are set to zero, and a second signal frame is generated and transmitted;
setting all effective subcarriers in the pilot symbols to zero, and generating and transmitting a third signal frame; and calculating the signal-to-noise ratio according to the third power of the second signal frame and the fourth power of the third signal frame.
Illustratively, the effective subcarriers may be completely set to zero, and then the noise power is counted at the receiving end; then, all the effective subcarriers are set to be 1, then the signal power containing noise interference is counted at a receiving end, and the signal-to-noise ratio from the user node to the receiving node is obtained through a calculation interface.
Further, in order to avoid the statistical error occurring in the random case, i.e. the situation of enhancing or weakening the noise burst in the channel, the above embodiment may be implemented multiple times, and then averaged, thereby reducing the statistical error.
Further, before transmitting the signal frame, the method further includes:
and determining a frame header pilot symbol according to the pilot sequence, wherein the frame header pilot symbol and the pilot symbol of the user node subframe are selected from different positions in the pilot sequence.
A header pilot symbol of the signal frame may be determined using a pilot sequence used to determine pilot symbols of the user node sub-frame. The method can intercept characters with the same length from the pilot sequence according to the length of the frame header pilot symbol to obtain the frame header pilot symbol.
The pilot frequency symbol of the user sub-frame and the pilot frequency symbol of the frame header use the same pilot frequency sequence, which can avoid interfering the synchronization of the signal frame header.
The industrial control bus signal-to-noise ratio calculation method provided by the embodiment of the invention determines the pilot symbols of the user node sub-frames according to the pilot sequences, and sets the effective sub-carriers in the pilot symbols to be zero or non-zero; the signal frame is generated and transmitted according to the pilot symbols, the signal-to-noise ratio is determined according to the effective subcarriers in the signal frame, the signal-to-noise ratio can be calculated in a mode of carrying out complete or partial zero setting on the effective subcarriers in the signal frame, and the resource utilization rate is improved. In addition, a signal frame is generated and transmitted according to the pilot symbols, the signal-to-noise ratio is calculated according to the first power of the effective subcarriers with the zero setting and the second power of the effective subcarriers with the non-zero setting, the pilot signals and the user data can be simultaneously transmitted in the signal frame, the signal-to-noise ratio can be calculated according to the first power of the effective subcarriers with the zero setting and the second power of the effective subcarriers with the non-zero setting in the pilot symbols of the user node sub-frames in the signal frame, the signal-to-noise ratio can be calculated according to the signal frame, and the resource utilization rate can be further improved.
Fig. 2 is a flowchart of another method for calculating a signal-to-noise ratio of an industrial control bus according to an embodiment of the present invention, which is used to further describe the above embodiment, and includes:
and 210, generating an initial pilot frequency sequence according to a preset formula.
The initial pilot sequence, also referred to as an m-sequence, may be generated using the following formula.
x 11 +x 8 +x 5 +x 2 +1 (formula one)
The analog circuit diagram corresponding to equation one is shown in fig. 3, where D is a unit of data corresponding to x raised to the power. And adding the power of 2 of X to the power of zero of X, performing modular addition operation with the power of 5 of X, performing modular addition operation with the power of 8 of X, performing modular addition operation with the power of 11 of X, and outputting (output) to obtain an m sequence.
Step 220, the initial pilot sequence is modulated to obtain a pilot sequence.
The m sequence is subjected to Binary Phase Shift Keying (BPSK) modulation to obtain a pilot sequence r (m).
And step 230, determining a pilot symbol of the user node subframe according to the pilot sequence.
And step 240, setting zero to a part of effective subcarriers in the pilot symbols, and setting nonzero to another part of effective subcarriers in the pilot symbols.
And step 250, generating and transmitting a signal frame according to the pilot symbols, and calculating the signal-to-noise ratio according to the first power of the effective sub-carrier subjected to zero setting and the second power of the effective sub-carrier not subjected to zero setting.
On the basis of the embodiment, the pilot frequency sequence can be calculated according to the preset formula, so that the generation of the pilot frequency sequence is more accurate and controllable, and the reliability is improved.
Fig. 4 is a flowchart of another method for calculating a signal-to-noise ratio of an industrial control bus according to an embodiment of the present invention, which is used to further describe the above embodiment, and includes:
step 301, determining a pilot symbol of a user node subframe according to a pilot sequence;
step 302, obtaining the position information of the target effective subcarrier, where the position information includes the number of the OFDM symbol of the target effective subcarrier and the serial number of the target effective subcarrier in the effective subcarrier packet.
And acquiring the number of the OFDM symbol of the target effective subcarrier, and assigning the number of the OFDM symbol of the target effective subcarrier to l. And acquiring the serial number of the target effective subcarrier in the effective subcarrier group, and assigning the serial number of the target effective subcarrier in the effective subcarrier group to k.
And step 303, determining assignment of the target effective subcarrier according to the position information of the target effective subcarrier.
For the pilot symbol, after obtaining the pilot sequence r (m), the pilot sequence r (m) may be mapped to the resource element (k, l) according to formula two, to obtain an assignment of the resource element a (k, l), that is, the assignment may be set to zero or non-zero, and formula two is as follows:
a 2*k,l ＝r(8*l+2*k)*(1-floor((1-r(1280+k))/2))
a2*k+1,l＝r(8*l+2*k+1)*floor((1-r(1280+k))/2)
in the next cycle, ak, l is assigned r (8 × l + k) and l is assigned l + 1.
The pilots are mapped to the i, i +1 th OFDM symbol of the frame. r (m) maps the resource elements (k, l) starting from k-0, m-8 l + k, and the mapping of the resource elements (k, l) should be performed in an ascending order of m.
And 304, generating and transmitting a signal frame according to the pilot symbols, and calculating the signal-to-noise ratio according to the first power of the effective sub-carrier subjected to zero setting and the second power of the effective sub-carrier subjected to non-zero setting.
The industrial control bus signal-to-noise ratio calculation method provided by the embodiment of the invention can calculate the zero position in the pilot frequency symbol according to the formula II, so that the pilot frequency symbol is transmitted while the user data symbol is transmitted, the sub-carrier wave of the effective sub-carrier wave part of the frequency domain of the pilot frequency symbol is set to be zero, and the receiving end realizes the signal-to-noise ratio estimation through the power statistics of the non-zero sub-carrier wave and the zero sub-carrier wave.
Fig. 5 is a schematic structural diagram of an industrial control bus signal-to-noise ratio calculation apparatus according to an embodiment of the present invention, where the apparatus is used for transmitting a signal frame and calculating an electronic device of a signal-to-noise ratio, and includes: a user pilot symbol determination module 41, a zero setting module 42, a signal frame generation module 43, and a signal-to-noise ratio calculation module 44.
A user pilot symbol determining module 41, configured to determine a pilot symbol of a user node subframe according to a pilot sequence;
a zero setting module 42, configured to set zero or non-zero to the effective subcarriers in the pilot symbols;
a signal frame generating module 43, configured to generate a signal frame according to the pilot symbols;
and the signal-to-noise ratio calculation module 44 is configured to transmit a signal frame, and determine a signal-to-noise ratio according to the effective subcarriers in the signal frame.
On the basis of the above embodiment, the zeroing module 42 is configured to: and setting a part of effective subcarriers in the pilot symbols to be zero, and setting another part of effective subcarriers in the pilot symbols to be nonzero. Accordingly, the signal frame generating module 43 is configured to generate and transmit a first signal frame according to the pilot symbols; the snr calculating module 44 is configured to calculate an snr according to a first power of a null-set effective subcarrier and a second power of a non-zero effective subcarrier in the first signal frame, where a part of effective subcarriers in pilot symbols of the first signal frame are null-set, and another part of effective subcarriers in the pilot symbols are non-zero.
On the basis of the above embodiment, the zeroing module 42 is configured to: setting all effective subcarriers in the pilot symbols to zero; or all effective subcarriers in the pilot symbols are set to be nonzero. Correspondingly, the signal frame generating module 43 is configured to set all the effective subcarriers in the pilot symbols to zero, and generate and transmit a second signal frame; setting all effective subcarriers in the pilot symbols to zero to generate and transmit a third signal frame; the signal-to-noise ratio calculating module 44 is configured to calculate a signal-to-noise ratio according to the third power of the second signal frame and the fourth power of the third signal frame.
On the basis of the above embodiment, the zeroing module 42 is configured to:
dividing effective subcarriers contained in the pilot symbols into N effective subcarrier groups;
in each effective sub-carrier grouping, the number of the effective sub-carriers with zero setting accounts for 1/M of the total number of the effective sub-carriers in the effective sub-carrier grouping.
On the basis of the above embodiment, N is an integer power of 2.
In addition to the above embodiments, M is an integer of 2 or more.
On the basis of the above embodiment, in each effective subcarrier group, the null-set effective subcarriers are randomly configured.
On the basis of the above embodiment, the method further includes a pilot sequence determination module. The pilot sequence determination module is configured to:
generating an initial pilot frequency sequence according to a preset formula;
and modulating the initial pilot frequency sequence to obtain a pilot frequency sequence.
On the basis of the above embodiment, the method further includes a frame header pilot symbol determining module. The frame header pilot symbol determining module is used for:
and determining a frame header pilot symbol according to the pilot sequence, wherein the frame header pilot symbol and the pilot symbol of the user node subframe are selected from different positions in the pilot sequence.
On the basis of the above embodiment, the zeroing module 42 is configured to:
acquiring position information of a target effective subcarrier, wherein the position information comprises the number of an OFDM symbol of the target effective subcarrier and the serial number of the target effective subcarrier in an effective subcarrier group;
and determining the assignment of the target effective subcarrier according to the position information of the target effective subcarrier.
In the device for calculating the signal-to-noise ratio of the industrial control bus provided by the embodiment of the invention, the user pilot symbol determining module 41 determines the pilot symbols of the user node sub-frames according to the pilot sequence; the zero setting module 42 sets the effective sub-carriers in the pilot symbols to zero or non-zero; the signal frame generating module 43 generates and transmits a signal frame according to the pilot symbols, the signal-to-noise ratio calculating module 44 transmits the signal frame, determines the signal-to-noise ratio according to the effective subcarriers in the signal frame, can realize the simultaneous transmission of the pilot signals and the user data in the signal frame, and can calculate the signal-to-noise ratio according to the first power of the effective subcarriers with zero and the second power of the effective subcarriers with non-zero in the pilot symbols of the user node subframes in the signal frame, thereby realizing the calculation of the signal-to-noise ratio according to the signal frame and improving the resource utilization rate. In addition, a signal frame is generated and transmitted according to the pilot symbols, the signal-to-noise ratio is calculated according to the first power of the effective subcarriers with the zero setting and the second power of the effective subcarriers with the non-zero setting, the pilot signals and the user data can be simultaneously transmitted in the signal frame, the signal-to-noise ratio can be calculated according to the first power of the effective subcarriers with the zero setting and the second power of the effective subcarriers with the non-zero setting in the pilot symbols of the user node sub-frames in the signal frame, the signal-to-noise ratio can be calculated according to the signal frame, and the resource utilization rate can be further improved.
The device can execute the methods provided by all the embodiments of the invention, and has corresponding functional modules and beneficial effects for executing the methods. For details not described in detail in this embodiment, reference may be made to the methods provided in all the foregoing embodiments of the present invention.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. FIG. 6 illustrates a block diagram of an electronic device 312 suitable for use in implementing embodiments of the present invention. The electronic device 312 shown in fig. 6 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present invention. The device 312 is typically a personal computer, tablet, or smartphone for data desensitization.
As shown in fig. 6, electronic device 312 is in the form of a general purpose computing device. The components of the electronic device 312 may include, but are not limited to: one or more processors 316, a storage device 328, and a bus 318 that couples the various system components including the storage device 328 and the processors 316.
Bus 318 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures can include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, an enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.
Electronic device 312 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by electronic device 312 and includes both volatile and nonvolatile media, removable and non-removable media.
Storage 328 may include computer system readable media in the form of volatile Memory, such as Random Access Memory (RAM) 330 and/or cache Memory 332. The electronic device 312 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 334 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 6, and commonly referred to as a "hard drive"). Although not shown in FIG. 6, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a Compact disk-Read Only Memory (CD-ROM), a Digital Video disk (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to bus 318 by one or more data media interfaces. Storage 328 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
Program 336 having a set (at least one) of program modules 326 may be stored, for example, in storage 328, such program modules 326 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which may comprise an implementation of a network environment, or some combination thereof. Program modules 326 generally carry out the functions and/or methodologies of embodiments of the present invention as described herein.
Electronic device 312 may also communicate with one or more external devices 314 (e.g., keyboard, pointing device, camera, display 324, etc.), with one or more devices that enable a user to interact with electronic device 312, and/or with any devices (e.g., network card, modem, etc.) that enable electronic device 312 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interfaces 322. Also, the electronic device 312 may communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN), and/or a public Network, such as the internet) via the Network adapter 320. As shown, the network adapter 320 communicates with the other modules of the electronic device 312 over the bus 318. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 312, including but not limited to: microcode, device drivers, Redundant processing units, external disk drive Arrays, disk array (RAID) systems, tape drives, and data backup storage systems, to name a few.
The processor 316 executes programs stored in the storage device 328 to perform various functional applications and data processing, such as implementing the signal-to-noise ratio calculation method of the industrial control bus provided by the above-mentioned embodiment of the present invention.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for calculating the signal-to-noise ratio of the industrial control bus provided in an embodiment of the present invention.
Of course, the computer program stored on the computer-readable storage medium provided by the embodiments of the present invention is not limited to the method operations shown above, and may also perform related operations in the industrial control bus signal-to-noise ratio calculation method provided by any embodiments of the present invention.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.

Claims (2)

1. An industrial control bus signal-to-noise ratio calculation method is applied to a signal frame, wherein the signal frame comprises allocable resources, and the allocable resources comprise pilot symbols of a user node subframe, and the method is characterized by comprising the following steps:
determining a pilot frequency symbol of the user node subframe according to a pilot frequency sequence;
setting all effective subcarriers in the pilot symbols to zero to generate and transmit a second signal frame;
setting all effective subcarriers in the pilot symbols to be one, and generating and transmitting a third signal frame;
and calculating the signal-to-noise ratio according to the third power of the second signal frame and the fourth power of the third signal frame.
2. The signal-to-noise ratio calculation method for the industrial control bus according to claim 1, wherein before the signal frame is transmitted, the method further comprises:
and determining a frame header pilot symbol according to the pilot sequence, wherein the frame header pilot symbol and the pilot symbol of the user node subframe are selected from different positions in the pilot sequence.
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