CN106411358A - Power line channel characteristic simulation and evaluation method - Google Patents
Power line channel characteristic simulation and evaluation method Download PDFInfo
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- CN106411358A CN106411358A CN201610830260.0A CN201610830260A CN106411358A CN 106411358 A CN106411358 A CN 106411358A CN 201610830260 A CN201610830260 A CN 201610830260A CN 106411358 A CN106411358 A CN 106411358A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Abstract
The invention discloses a power line channel characteristic simulation and evaluation method and belongs to the technical field of power line channel communication. Various complicated characteristics of a power line channel are automatically simulated. The characteristics comprise a noise characteristic, a load characteristic and an attenuation characteristic. The noise characteristic comprises four noise environments: a noiseless environment, a white noise environment, a pulse noise environment and a custom noise environment. The load characteristic comprises two kinds of load characteristics: a constant standard load environment and a constant heavy load environment. According to the attenuation characteristic, an attenuation model of a power line for a signal is represented by directly adopting a lumped attenuator. The attenuation characteristic also comprises performance of two algorithms for communication performance evaluation of a power line carrier communication system. The performance comprises process steps of a limit attenuation characteristic progressive increase algorithm and the process steps of a limit attenuation characteristic approximation algorithm. Special power line channel characteristics are positioned.
Description
Technical field
The present invention relates to a kind of simulation of power line channel characteristic and appraisal procedure, belong to power line channel technical field.
Background technology
Power line environment is a time-varying system, and its various characteristic is sufficiently complex, can use the equivalent mould of distributed constant of time-varying
Type approaching, thus leading to real power line environment to be also very difficult for the impact of power-line carrier communication system communication performance
With assessment.In actual power line environment, test cannot directly obtain the performance indications of communication system.The actual electricity of research
The line of force characteristic of channel is unfavorable for catching its principal character for communication systems leverage, not with practical value.
Content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of simulation of power line channel characteristic and appraisal procedure.
A kind of simulation of power line channel characteristic and appraisal procedure, the various complex characteristics of automatic imitation power line channel,
Including noise characteristic, load characteristic and attenuation characteristic；Wherein noise characteristic comprises four kinds of noise circumstances：Noise-free environment, white noise
Acoustic environment, impulse noise environment and self-defined noise circumstance；Load characteristic comprises two kinds of load characteristics：Constant standard termination environment
And constant heavy duty environment；Attenuation characteristic directly to characterize the attenuation model for signal for the electric lines of force using the attenuator of lump；
Wherein attenuation characteristic also comprises two kinds of incremental calculations of ultimate damping characteristics being directed to power-line carrier communication system Communication Performance Evaluation
Method process step and ultimate damping characteristic approximate algorithm process step, position specific power line channel feature.
It is an advantage of the invention that：Can be used for the characteristic of channel under limit communicativeness of power-line carrier communication system
Simulation and assessment.Real power line transmission characteristics simplified is the mathematical model of lumped parameter by this algorithm.In this mathematical model
In consider the equivalent simulation for electric force lines distribution parameter for three kinds of time-varying factors.Three kinds of characteristics include：Noise characteristic, load is special
Property, attenuation characteristic.This algorithm can be automatically performed assessment and the simulation of above characteristic, by attenuation characteristic automatic search algorithm,
Position specific electric lines of force attenuation channel feature.
Brief description
When considered in conjunction with the accompanying drawings, by referring to detailed description below, can more completely more fully understand the present invention with
And easily learn the adjoint advantage of many of which, but accompanying drawing described herein is used for providing a further understanding of the present invention,
Constitute the part of the present invention, the schematic description and description of the present invention is used for explaining the present invention, does not constitute to this
Bright improper restriction, such as figure are wherein：
Fig. 1 is the ultimate damping characteristic add algorithm flow chart of the present invention.
Fig. 2 is the ultimate damping characteristic approximate algorithm flow chart of the present invention.
The present invention is further described with reference to the accompanying drawings and examples.
Specific embodiment
Obviously, those skilled in the art belong to the guarantor of the present invention based on the many modifications and variations that spirit of the invention is done
Shield scope.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " " used herein, "
Individual ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that wording " bag used in this specification
Include " refer to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that exist or add one or
Other features multiple, integer, step, operation, element, assembly and/or their group.It should be understood that when title element, assembly quilt
When ' attach ' to another element, assembly, it can be directly connected to other elements or assembly, or can also there is cental element
Part or assembly.Wording "and/or" used herein includes one or more associated any cell of item and complete listed
Portion combines.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (include technology art
Language and scientific terminology) there is general understanding identical meaning with the those of ordinary skill in art of the present invention.Also should
It is understood by, those terms defined in such as general dictionary should be understood that the meaning having with the context of prior art
The consistent meaning of justice, and unless defined as here, will not be explained with idealization or excessively formal implication.
For ease of the understanding to the embodiment of the present invention, explanation will be further explained below, and each embodiment will be not
Constitute the restriction to the embodiment of the present invention.
Embodiment 1：As shown in Figure 1 and Figure 2, a kind of simulation of power line channel characteristic and appraisal procedure, containing following step
Suddenly；
The various complex characteristics of automatic imitation power line channel, including noise characteristic, load characteristic and attenuation characteristic；
Wherein noise characteristic comprises four kinds of noise circumstances：Noise-free environment, white noise environment, impulse noise environment and make by oneself
Adopted noise circumstance；
Load characteristic comprises two kinds of load characteristics：Constant standard termination environment and constant heavy duty environment；
Attenuation characteristic directly to characterize the attenuation model for signal for the electric lines of force using the attenuator of lump；
Wherein attenuation characteristic also comprises two kinds of ultimate dampings spies being directed to power-line carrier communication system Communication Performance Evaluation
Property searching algorithm, position specific power line channel feature；
First, ultimate damping characteristic add algorithm process step, containing following steps；
The qualified test index of step 1, setting communication performance and search initialization value；
Wherein qualified index includes two parameters：
1), the communication total degree T of single test；
2), the permission communication failure number of times F of single test；
Search initialization value includes two parameters：
1), primary channel pad value A；
2), stepping pad value S；
Step 2, communication system two-way communication, are now state 1 for system；
Step 3, judge communication whether success；If system communicates successfully, the basic pad value A=A+S of system, jump to
Step 2, if system communication is unsuccessful, jumps to step 4；
Step 4, the permission communication failure number of times F=F-1 of the single test of system, judge whether F is less than zero, if very then
Jump to step 2, if vacation then jumps to step 5；
Step 5, setting primary channel pad value A=A-1, and the permission communication failure number of times F value of single test is initial
Change, define the successfully frame number S1=0 that communicates；
Step 6, communication system two-way communication, are now state 2 for system；
Step 7, judge communication whether success；If system communicates successfully, jump to step 8, otherwise jump to step 9；
Step 8, successful frame number S1=S1+1, and judge whether S1 is equal to the communication total degree T of single test, if false
Then jump to step 6, if very then jumping to step 10；
Step 9, the permission communication failure number of times F=F-1 of the single test of system, judge whether F is less than zero, if very then
Jump to step 5, if vacation then jumps to step 6；
Step 10, end, output limit attenuation characteristic A.
2nd, ultimate damping characteristic approximate algorithm process step, containing following steps；
The qualified test index of step 1, setting communication performance and search initialization value；
Wherein qualified index includes two parameters：
1), the communication total degree T of single test；
2), the permission communication failure number of times F of single test；
Search initialization value includes three parameters：
1), maximum attenuation value MAX；
2), minimal attenuation value MIN；3) current attenuation value A=MIN；
Step 2, communication system two-way communication, are now state 1 for system；
Step 3, judge communication whether success, if success, jump to step 4, otherwise jump to step 18；
Step 4, setting current attenuation value A=MAX；
Step 5, communication system two-way communication, are now state 2 for system；
Step 6, judge communication whether success, if success, jump to step 18, otherwise jump to step 7；
Step 7, setting current attenuation value be A=ceil ((MAX+MIN)/2) (characterize for MAX and MIN meansigma methodss to
On round)；
Step 8, judge that whether MAX-A is equal to 1, if very, then jump to step 11, if vacation then jumps to step 9；
Step 9, communication system two-way communication, are now state 3 for system；
Step 10, judge communication whether success, if success, A value is assigned to MIN, and jumps to step 7, if failing
Then A value is assigned to MAX, and jumps to step 7；
Step 11, definition communicate successfully frame number S1=0；
Step 12, communication system two-way communication, are now state 4 for system；
Step 13, judge communication whether success；If system communicates successfully, jump to step 14, otherwise jump to step 15；
Step 14, successful frame number S1=S1+1, and judge whether S1 is equal to the communication total degree T of single test, if
Vacation then jumps to step 12, if very then jumping to step 18；
Step 15, the permission communication failure number of times F=F-1 of the single test of system, judge whether F is less than zero, if very
Then jump to step 16, if vacation then jumps to step 12；
Step 16, communicate successfully frame number S1=0；
Step 17, setting primary channel pad value A=A-1, and the permission communication failure number of times F value of single test is initial
Change, communicate successfully frame number S1=0；
Step 18, end, output limit pad value is A.
Embodiment 2：A kind of simulation of power line channel characteristic and appraisal procedure, containing following steps；For automatic imitation
The various complex characteristics of power line channel, by attenuation characteristic automatic search algorithm, position specific power line channel feature.Should
Algorithm can be used for the simulation of the characteristic of channel under limit communicativeness and the assessment of power-line carrier communication system.
Specific power line noise is used for simulating complicated real power line noise characteristic states, simplifies it irregular
Property, but most of characteristic can be covered.Using it, Communication Performance Evaluation of power-line carrier communication system can be obtained very
Good quantizating index.Wherein comprise following several noise circumstance：
Noise-free environment, this environment is used for characterizing the test environment of supersilent, and the limit being capable of test receiver connects
Receive performance；
White noise environment, this environment is used for the electric power wire loop that analog spectrum covers the noise of communication system modulation frequency range
Border, can be with the strength simulation of Regulate signal more actual noise state；
Impulse noise environment, this environment is used for simulating common impulse type power line noise, the week of scalable pulse signal
Phase and strength simulation more actual noise state；
Self-defined noise circumstance, this environment is used for simulating the power line noise environment of actual acquisition, can be used to assessment electricity
Communication performance under real noise state for the powerline carrier communication system；
Electric lines of force load characteristic is simulated, because the load equipment real-time change on electric lines of force, the load of electric lines of force is special
Levy and also there is time variation, for the carrier communication frequency range of 5K～500K, its load changes generally in the range of certain, such as 1～
50 ohm.This simulation algorithm to simulate the electric lines of force load characteristic of reality using two states load module, including：
Constant standard termination, this environment is used for simulating more satisfactory transmission line characteristics, can be used to assessment in electric lines of force
The communication performance of channel loading characteristic ideally power-line carrier communication system；
Constant heavy duty, this environment be used for simulate electric power linear load much under desired transmission characteristic, for assessing in electricity
Line of force channel loading characteristic is the communication performance of power-line carrier communication system under the heavy duty of region；
Electric lines of force attenuation characteristic is simulated, the loss for signal that the resistance for simulating electric lines of force itself produces, this damage
Consumption is also to be difficult to precisely assess due to the complexity of electric force lines distribution.This simulation algorithm directly to characterize electricity using the attenuator of lump
The line of force is for the attenuation model of signal.
For power-line carrier communication system, this model also includes two kinds of attenuation characteristic automatic search algorithms, can be used to
Simulate and assess the ultimate damping characteristic for power line carrier transmitting-receiving system.Pad value simulation and assessment searching algorithm comprise two
Kind：
Ultimate damping characteristic add algorithm, this algorithm is used for the ultimate damping characteristic of test system, using pad value progressively
Increase to determine the thought of the ultimate damping characteristic for this power line carrier transmitting-receiving system.
Ultimate damping characteristic approximate algorithm, this algorithm be used for test system ultimate damping characteristic, using two way classification come by
Step determines the thought of final attenuation characteristic.
As described above, being explained to embodiments of the invention, but as long as essentially without depart from this
Bright inventive point and effect can have a lot of deformation, and this will be readily apparent to persons skilled in the art.Therefore, this
The variation of sample is also integrally incorporated within protection scope of the present invention.
Claims (3)
1. a kind of simulation of power line channel characteristic and appraisal procedure it is characterised in that automatic imitation power line channel various multiple
Miscellaneous characteristic, including noise characteristic, load characteristic and attenuation characteristic；Wherein noise characteristic comprises four kinds of noise circumstances：Noiseless ring
Border, white noise environment, impulse noise environment and self-defined noise circumstance；Load characteristic comprises two kinds of load characteristics：Constant standard
Load environment and constant heavy duty environment；Attenuation characteristic directly to characterize electric lines of force using the attenuator of lump and to decline for signal
Subtract model；Wherein attenuation characteristic also comprises two kinds of algorithms enforcements being directed to power-line carrier communication system Communication Performance Evaluation：Pole
Limit attenuation characteristic add algorithm process step and ultimate damping characteristic approximate algorithm process step, position specific power line channel
Feature.
2. a kind of simulation of power line channel characteristic according to claim 1 and appraisal procedure are it is characterised in that the limit declines
Subtract characteristic add algorithm process step, containing following steps；
The qualified test index of step 1, setting communication performance and search initialization value；
Wherein qualified index includes two parameters：
1), the communication total degree T of single test；
2), the permission communication failure number of times F of single test；
Search initialization value includes two parameters：
1), primary channel pad value A；
2), stepping pad value S；
Step 2, communication system two-way communication, are now state 1 for system；
Step 3, judge communication whether success；If system communicates successfully, the basic pad value A=A+S of system, jump to step
2, if system communication is unsuccessful, jump to step 4；
Step 4, the permission communication failure number of times F=F-1 of the single test of system, judge whether F is less than zero, if very then redirecting
To step 2, if vacation then jumps to step 5；
Step 5, setting primary channel pad value A=A-1, and the permission communication failure number of times F value initialization of single test, fixed
The adopted successfully frame number S1=0 that communicates；
Step 6, communication system two-way communication, are now state 2 for system；
Step 7, judge communication whether success；If system communicates successfully, jump to step 8, otherwise jump to step 9；
Step 8, successful frame number S1=S1+1, and judge whether S1 is equal to the communication total degree T of single test, if vacation is then jumped
Go to step 6, if very then jumping to step 10；
Step 9, the permission communication failure number of times F=F-1 of the single test of system, judge whether F is less than zero, if very then redirecting
To step 5, if vacation then jumps to step 6；
Step 10, end, output limit attenuation characteristic A.
3. a kind of simulation of power line channel characteristic according to claim 1 and appraisal procedure are it is characterised in that the limit declines
Subtract characteristic approximate algorithm process step, containing following steps；
The qualified test index of step 1, setting communication performance and search initialization value；
Wherein qualified index includes two parameters：
1), the communication total degree T of single test；
2), the permission communication failure number of times F of single test；
Search initialization value includes three parameters：
1), maximum attenuation value MAX；
2), minimal attenuation value MIN；
3), current attenuation value A=MIN；
Step 2, communication system two-way communication, are now state 1 for system；
Step 3, judge communication whether success, if success, jump to step 4, otherwise jump to step 18；
Step 4, setting current attenuation value A=MAX；
Step 5, communication system two-way communication, are now state 2 for system；
Step 6, judge communication whether success, if success, jump to step 18, otherwise jump to step 7；
Step 7, setting current attenuation value are that A=ceil ((MAX+MIN)/2) (characterizes the meansigma methodss for MAX and MIN to take upwards
Whole)；
Step 8, judge that whether MAX-A is equal to 1, if very, then jump to step 11, if vacation then jumps to step 9；
Step 9, communication system two-way communication, are now state 3 for system；
Step 10, judge communication whether success, if success, A value is assigned to MIN, and jumps to step 7, if failing, by A
Value is assigned to MAX, and jumps to step 7；
Step 11, definition communicate successfully frame number S1=0；
Step 12, communication system two-way communication, are now state 4 for system；
Step 13, judge communication whether success；If system communicates successfully, jump to step 14, otherwise jump to step 15；
Step 14, successful frame number S1=S1+1, and judge whether S1 is equal to the communication total degree T of single test, if vacation is then
Jump to step 12, if very then jumping to step 18；
Step 15, the permission communication failure number of times F=F-1 of the single test of system, judge whether F is less than zero, if very then jumping
Go to step 16, if vacation then jumps to step 12；
Step 16, communicate successfully frame number S1=0；
Step 17, setting primary channel pad value A=A-1, and the permission communication failure number of times F value initialization of single test,
Communicate successfully frame number S1=0；
Step 18, end, output limit pad value is A.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113032190A (en) * | 2019-12-09 | 2021-06-25 | 圣邦微电子（北京）股份有限公司 | IIC interface time sequence parameter testing method and IIC interface time sequence parameter testing device |
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