CN106921463A - A kind of anti-interference coding/decoding method and system - Google Patents
A kind of anti-interference coding/decoding method and system Download PDFInfo
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- CN106921463A CN106921463A CN201510994987.8A CN201510994987A CN106921463A CN 106921463 A CN106921463 A CN 106921463A CN 201510994987 A CN201510994987 A CN 201510994987A CN 106921463 A CN106921463 A CN 106921463A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/008—Registering or indicating the working of vehicles communicating information to a remotely located station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The present invention relates to a kind of anti-interference coding/decoding method and system, methods described includes：Base-band analog signal is sampled to obtain sampled signal；Pretreatment is filtered to sampled signal to remove the interference signal not in frequency band, the sampled signal that acquisition is pre-processed after filtering；The change edge of the sampled signal to pre-processing after filtering is identified generating data signal；The noise signal of data signal is removed to obtain by the data signal of shaping；Data signal by shaping is decoded, to obtain decoded signal and corresponding sampled clock signal；And decoded signal is parsed to generate communication data according to the corresponding sampled clock signal.The anti-interference for FM0 coded data solution code systems can be effectively improved using anti-interference coding/decoding method of the invention, the data receiver performance of system is effectively improved.
Description
Technical field
The present invention relates to wireless communication technology field, and encoded more particularly, to spacing between a kind of two-phase
FM0
The anti-interference coding/decoding method and system of coded data.
Background technology
At present, electronic charging（
ETC
,
Electronic Toll Collection
）System is the autoelectrinic Fare Collection System of main research and extension in the world, and it is usually as the vehicle toll solution under highway and the bridge tunnel environment of heavy traffic.Mobile unit（
OBU
,
On-Board Unit
）It is
ETC
The standard fitting of system, for the front windshield installed in vehicle.When vehicle passes through
ETC
During track,
OBU
With roadside unit（
RSU
,
Roadside Unit
）Deng device talk, completed by being not required to parking
ETC
Charge.
In the whole nation
ETC
Under the main trend of networking, in order to realize each province
ETC
Equipment interconnects,
RSU
With
OBU
Equipment must all is fulfilled for GB
GB/T 20851-2007
《Electronic charging DSRC》And Department of Transportation
2011
Year the
13
Number bulletin《Turn pike networked electronic non-parking charge technical requirements》In regulation.Clear stipulaties in above-mentioned standard and bulletin
RSU
With
OBU
Between
DSRC
The coded system of communication is spacing coding between two-phase
FM0
（
Bi-Phase Space Coding
）, and the bit rate of up-link is
512kbps
, the bit rate of downlink is
256kbps
。
FM0
The operation principle of coding is to represent logic using level change in single position window.If level does not overturn from the section start upset of position window in the middle of window in place, then it represents that logic "
1
”.If level except window in place section start overturn, window intermediate flipped also in place then represent logic "
0
”。
In actual use, wireless transmission signal would generally be influenceed by noises such as surrounding enviroment and equipment and cause signal quality to be deteriorated.
FM0
The data-signal of coding generally occurs that interference, the interference of signal burr, signal dutyfactor change, signal amplitude change and bit rate change for being superimposed other frequencies etc. cause the more severe situation of signal.
Due to carry out
ETC
The producer of equipment production is numerous, and each producer
ETC
There is certain inconsistency in structure in equipment.So cause
ETC
The inconsistency of equipment is superimposed with the influence of interference signal so that decoding device needs the decoding environment for facing more severe.
At present, usually used coding/decoding method is mainly, first by the base band data after demodulation by obtaining digital signal waveform after hardware comparator or directly using integrated chip obtaining digital signal waveform, then made decisions using selected judgement moment and decision threshold, according to signal a position（
bit
）Whether there is upset in time to determine to be somebody's turn to do
bit
For
0
Or
1
.This method signal environment it is relatively severe and disturb it is stronger in the case of, the bit error rate will be caused to rise, and cause call duration time to increase or even communication failure.
Therefore, needing one kind can to overcome in the prior art
ETC
The coding/decoding method and system of the influence of the inconsistency and interference signal of equipment, the anti-interference for effectively strengthening decoding algorithm and the success rate for improving communication.
The content of the invention
In order to solve the above problems, the present invention
Propose a kind of
FM0
The anti-interference coding/decoding method of coded data, using a series of filtering and shaping measure, can effectively strengthen the anti-interference of decoding algorithm, improve the success rate of communication.
According to the first aspect of the invention, there is provided a kind of anti-interference coding/decoding method, including：
Base-band analog signal is sampled to obtain sampled signal；
Pretreatment is filtered to sampled signal to remove the interference signal not in frequency band, the sampled signal that acquisition is pre-processed after filtering；
The change edge of the sampled signal to pre-processing after filtering is identified generating data signal；
The noise signal of data signal is removed to obtain by the data signal of shaping；
Data signal by shaping is decoded, to obtain decoded signal and corresponding sampled clock signal；And
Decoded signal is parsed to generate communication data according to the corresponding sampled clock signal
。
Preferably, exist
Base-band analog signal is sampled before obtaining sampled signal, primary signal to be demodulated to obtain base-band analog signal.
Preferably,
The change edge of the sampled signal to pre-processing after filtering is identified including：Signal value according to the continuous sampling point to sampled signal judges, determines that sampled signal is in first transition or last transition.
Preferably, wherein
When signal value of the sampled signal in first transition and subsequent continuous sampling point is changed into constantly reducing, judge whether the amount that signal value reduces reaches change threshold, the upset of sampled signal is determined if change threshold is reached；
When signal value of the sampled signal in last transition and subsequent continuous sampling point is changed into constantly increasing, judge whether the increased amount of signal value reaches change threshold, the upset of sampled signal is determined if change threshold is reached.
Preferably, also include
The communication data is stored.
According to another aspect of the present invention, there is provided a kind of
Anti-interference decoding device
,
Including：
AD
Sampling unit, is sampled to obtain sampled signal to base-band analog signal；
Filter preprocessing unit, pretreatment is filtered to sampled signal to remove the interference signal not in frequency band, the sampled signal that acquisition is pre-processed after filtering；
Digital comparator unit, the change edge of the sampled signal to pre-processing after filtering is identified generating data signal；
Shaping unit, removes the noise signal of data signal to obtain by the data signal of shaping；
Signal decoding unit, decodes to the data signal by shaping, to obtain decoded signal and corresponding sampled clock signal；And
Data resolution unit, is parsed to generate communication data according to the corresponding sampled clock signal to decoded signal
。
Preferably, it is described
Anti-interference decoding device with
Modem is connected, the modem
Primary signal is demodulated to obtain base-band analog signal, and the base-band analog signal is sent to anti-interference decoding device
AD
Sampling unit.
Preferably,
The change edge of sampled signal of the digital comparator unit to pre-processing after filtering is identified including：Signal value according to the continuous sampling point to sampled signal judges, determines that sampled signal is in first transition or last transition..
Preferably, wherein
When signal value of the sampled signal in first transition and subsequent continuous sampling point is changed into constantly reducing, judge whether the amount that signal value reduces reaches change threshold, the upset of sampled signal is determined if change threshold is reached；
When signal value of the sampled signal in last transition and subsequent continuous sampling point is changed into constantly increasing, judge whether the increased amount of signal value reaches change threshold, the upset of sampled signal is determined if change threshold is reached.
Preferably, the anti-interference decoding device also includes memory cell, the memory cell
The communication data is stored.
Brief description of the drawings
By reference to the following drawings, illustrative embodiments of the invention can be more fully understood by：
Figure
1
It is the structural representation of the anti-interference solution code system according to the preferred embodiment for the present invention；
Figure
2
It is the schematic diagram of the signal of filter preprocessing cell processing according to the preferred embodiment for the present invention；
Figure
3
It is the schematic diagram of the signal according to the treatment of the digital comparator unit of the preferred embodiment for the present invention；
Figure
4
It is the schematic diagram of the signal according to the treatment of the shaping unit of the preferred embodiment for the present invention；
Figure
5
It is the schematic diagram of the signal according to the treatment of the signal decoding unit of the preferred embodiment for the present invention；And
Figure
6
It is the flow chart of the anti-interference coding/decoding method according to the preferred embodiment for the present invention.
Specific embodiment
With reference now to accompanying drawing, introduce illustrative embodiments of the invention, but, the present invention can be implemented with many different forms, and it is not limited to embodiment described herein, these embodiments are provided it are to disclose at large and fully the present invention, and the scope of the present invention is fully passed on to person of ordinary skill in the field.It is not limitation of the invention for the term in the illustrative embodiments that are illustrated in the accompanying drawings.In the accompanying drawings, identical unit
/
Element uses identical reference.
Unless otherwise indicated, term used herein（Including scientific and technical terminology）Have to person of ordinary skill in the field and common understand implication.Further it will be understood that the term limited with usually used dictionary, being appreciated that the linguistic context in field associated therewith has consistent implication, and is not construed as Utopian or excessively formal meaning.
Figure
1
It is the anti-interference solution code system according to the preferred embodiment for the present invention
100
Structural representation.As schemed
1
It is shown, anti-interference solution code system
100
Including：
AD
Sampling unit
101
, filter preprocessing unit
102
, digital comparator unit
103
, shaping unit
104
, signal decoding unit
105
, data parsing
106
And memory cell
107
.Preferably, anti-interference solution code system
100
Using
A series of filtering and shaping measure, can effectively strengthen the anti-interference of decoding algorithm and improve the success rate of communication.
Preferably,
AD
Sampling unit
101
Base-band analog signal to being obtained after demodulation is sampled to obtain sampled signal.Preferably, anti-interference solution code system
100
Also include modem module（Figure
1
Not shown in
）, for the primary signal for receiving to be modulated or is demodulated.Modem module is demodulated to obtain base-band analog signal to the primary signal for receiving.Preferably, in order to as far as possible control in reduced levels the distortion level of primary signal,
AD
Sampling unit
101
On the basis of nyquist sampling theorem is met, properly increase sample frequency to retain the more information of primary signal.
At present,
ETC
System
FM0
Code rate is up to
512Kbps
（
The bit rate of up-link is
512kbps
, the bit rate of downlink is
256kbps
）.Preferably, in order to subsequent processing units can effectively filter out interference and burr etc., can be by
AD
Sampling unit
101
Sample frequency be set to
16.384MHz
.In this case, it is single
bit
Time in can sample
32
Individual point.Preferably, the present invention is only with sample frequency
16.384MHz
Illustrated as example, one of ordinary skill in the art it will be appreciated that
AD
Sampling unit
101
Sample frequency could be arranged to any rational numerical value.
Preferably, filter preprocessing unit
102
It is right
AD
Sampling unit
101
The sampled signal of output is filtered pretreatment to remove the interference of signal of the part not in frequency band.Preferably, filter preprocessing unit
102
Low pass or band logical can be used limit for length's unit impulse response（
FIR
,
Finite Impulse Response
）Wave filter.Generally, the speed of the data for decoding as needed, sets band connection frequency and stop-band frequency.The useful signal near the frequency of needs thus can be as much as possible retained in, and the interference signal of other frequencies is effective filtered out.Preferably, the method for being used is included but is not limited to
FIR
Filtering, signal peak clipping etc., can effective filter out the interference signal not in signal frequency range
Figure
2
It is the schematic diagram of the signal of filter preprocessing cell processing according to the preferred embodiment for the present invention.As schemed
2
Shown, upper waveform is pretreatment unit after filtering
102
The sampled signal waveform for the treatment of, lower waveform be by
AD
Sampling unit
101
The sampled signal waveform of sampling.Pretreatment unit after filtering
102
Afterwards, the noise and interference signal to other frequencies are effectively filtered out, and obtain smooth data signal waveforms.After pre-processing after filtering, signal is integrated with about
2bit
The time delay in cycle, size and the filter preprocessing unit of time delay
102
The computing capability of the filter preprocessing algorithm for being used and the processor for using is relevant.
Preferably, digital comparator unit
103
The change edge of the sampled signal for that will pre-process after filtering is reduced to generate digital signal waveform.Preferably, digital comparator unit
103
Sampled signal is processed for the method using sampling extreme point.Signal value according to the continuous sampling point to sampled signal judges, it is determined that being currently at first transition or last transition.For example, when the signal value of the continuous sampling point of sampled signal constantly increases, then can determine to be currently at first transition, and the signal value for working as the continuous sampling point of sampled signal constantly reduces, then can determine to be currently at last transition.
Preferably, digital comparator unit
103
It is provided for distinguishing change threshold when first transition and last transition alternating change.Change threshold when first transition is reached and last transition alternately changes, carries out the upset of signal.For example, when the first transition that the signal value of the continuous sampling point in sampled signal constantly increases and when the signal value of subsequent continuous sampling point occur and being changed into constantly reducing, judge whether the amount that signal value reduces reaches change threshold, the upset of sampled signal is determined if change threshold is reached.Similarly, when the continuous sampling point in sampled signal the ever-reduced last transition of signal value and when there is the signal value of subsequent continuous sampling point and being changed into constantly increasing, judge whether the increased amount of signal value reaches change threshold, the upset of sampled signal is determined if change threshold is reached.Preferably, rational change threshold can be set according to factors such as signal quality, interference strength, neighbouring environment.Wherein, the amount that signal value reduces refers to the difference of neighbouring highest signal value and currency, and the increased amount of signal value refers to signal value from neighbouring lowest signal value and the difference of currency.
Due to
FM0
Data can all be overturn at the edge of signal, therefore initial level is
0
Or
1
Signal is not influenceed in itself.Preferably, digital comparator unit
103
By the way of extreme value judgement, can more efficiently reflect primary signal
/
The change moment of sampled signal.Because the processing method of digital comparator unit can effectively reflect the change moment of primary signal, therefore the recovery capability to primary signal dutycycle can also be effectively improved.
Figure
3
It is the schematic diagram of the signal according to the treatment of the digital comparator unit of the preferred embodiment for the present invention.As schemed
3
Shown, upper waveform is by digital comparator unit
103
The digital signal waveform obtained after analog-to-digital conversion is carried out, lower waveform is filter preprocessing unit
102
The sampled signal waveform for pre-processing after filtering of output.Due to digital comparator unit
103
Analog-to-digital conversion is carried out by the way of signal trend is judged, the digital signal waveform being converted to can approach the change moment of primary signal, can obtain good dutycycle.
Preferably, shaping unit
104
To digital comparator unit
103
The digital signal waveform of output carries out shaping.Shaping unit
104
Effective filter out digital comparator unit
103
Burr signal in output waveform, can more accurately reduce clean primary signal.Generally, the width of burr signal is less than the width half of normal signal, therefore in order to distinguish normal signal and burr signal, it is necessary to carry out effectively filtering out for burr according to the threshold value for setting, without causing the influence to normal signal in the case of change in duty cycle etc..Preferably, rational threshold value can be set according to factors such as signal quality, interference strength, neighbouring environment.Due to shaping unit
104
Burr in data signal is filtered, the issuable erroneous judgement of subsequent cell can be processed in order to subsequent cell and be reduced.
Figure
4
It is the schematic diagram of the signal according to the treatment of the shaping unit of the preferred embodiment for the present invention.As schemed
4
Shown, the waveform of top is by digital comparator unit
103
The digital signal waveform obtained after analog-to-digital conversion is carried out, the waveform of lower section is by shaping unit
104
Digital signal waveform afterwards.Shaping unit
104
Burr signal for width less than certain threshold value, can effectively be filtered.
Preferably, signal decoding unit
105
To by shaping unit
104
The data signal of shaping is decoded, to obtain decoded signal and corresponding sampled clock signal.Signal decoding unit
105
Sampled clock signal follow the edge of decoded signal to generate, can be effectively prevented from accumulated error and tolerance bit rate skew, while can reduce signal bit rate change to solve code system influence.In addition signal decoding unit
105
Need to judge whether the signal for receiving meets
FM0
Coding rule, for being unsatisfactory for
FM0
The signal of coding rule, carries out error abnormality processing.
Figure
5
It is the schematic diagram of the signal according to the treatment of the signal decoding unit of the preferred embodiment for the present invention.As schemed
5
Shown, the top is by signal decoding unit
105
The decoded signal of decoding, centre is the sampled clock signal of generation, and bottom is by shaping unit
104
The signal of shaping.Due to signal decoding unit
105
The sampled clock signal for following decoded signal is generated, subsequent cell is obtained decoded signal, can effectively avoided accumulated error and reduce influence of the bit rate to decoding effect.
Preferably, data resolution unit
106
Using the corresponding sampled clock signal to signal decoding unit
105
Decoded signal obtained by decoding is parsed to obtain communication data.Preferably, communication data is communicating pair, for example
ETC
The data for information exchange transmitted between equipment communication side..Data are parsed and memory cell
106
Carry out data link layer except zero, enter abnormality processing if not being inconsistent normally, string turn is carried out if rule is met and is operated and is stored, be easy to subsequently carry out protocol processes.
Preferably, memory cell
107
To data resolution unit
106
The communication data of parsing is stored.Memory cell
107
Can be various types of storage mediums, for example,
ROM
Or
PROM
, flash memory device.
Preferably, anti-interference solution code system
100
By using filter preprocessing unit
102
, digital comparator unit
103
And shaping unit
104
So that the interference free performance of decoding algorithm is significantly improved.After by unit entire cascaded, the anti-interference decoding capability of whole system is set to be significantly improved.The present invention is as a result of above-mentioned anti-interference solution code system
100
, can be in system interference than in the case of more serious, the effective success rate for improving decoding.
Figure
6
It is the anti-interference coding/decoding method according to the preferred embodiment for the present invention
600
Flow chart.Preferably, anti-interference coding/decoding method
600
The influence that interference signal is caused to decoding can be effective filtered out, can effectively be recovered
FM0
Coded data.Anti-interference coding/decoding method
600
ABB data are passed through
AD
Sampled signal obtained by sampling is filtered pretreatment, and the change edge for then comparing the sampled signal that treatment will be pre-processed after filtering using numeral reduce obtaining data signal, so as to form digital signal waveform.Further, method
600
Shape correction is carried out to data signal to be disturbed to filter flash removed, and to being decoded by the data signal after Shape correction.Preferably, when being decoded to data signal, synchronized sampling clock can also be obtained except recovering primary signal.Then, carried out data parsing and stored analysis result with synchronized sampling clock and the primary signal recovered.
Preferably, filter preprocessing can filter the interference of other frequency signals, numeral and compare treatment and effectively the edge of reduction primary signal and keep that dutycycle, Shape correction can filter burr and signal decoding process can avoid accumulated error and tolerate that bit rate offsets.By above-mentioned multiple treatment so that the interference free performance of decoding algorithm is significantly improved.After by each treatment entire cascaded, the anti-interference decoding capability of whole decoding process is set to be significantly improved
As schemed
6
It is shown, anti-interference coding/decoding method
600
From step
601
Place starts.In step
601
, to after demodulation obtain base-band analog signal sampled to obtain sampled signal.Preferably, in step
601
Before, the primary signal for receiving is demodulated to obtain base-band analog signal.Preferably, in order to as far as possible control in reduced levels, step the distortion level of primary signal
601
On the basis of nyquist sampling theorem is met, properly increase sample frequency to retain the more information of primary signal.
Preferably, in order to subsequent treatment can effectively filter out interference and burr etc., sample frequency can be set to
16.384MHz
.In this case, it is single
bit
Time in can sample
32
Individual point.Preferably, the present invention is only with sample frequency
16.384MHz
Illustrated as example, one of ordinary skill in the art it will be appreciated that
AD
Sampling unit
101
Sample frequency could be arranged to any rational numerical value.
Then, into step
602
, pretreatment is filtered to sampled signal to remove the interference of signal of the part not in frequency band.Preferably, in step
602
, can be used low pass or band logical to have limit for length's unit impulse response（
FIR
,
Finite Impulse Response
）Wave filter.Generally, the speed of the data for decoding as needed, sets band connection frequency and stop-band frequency.The useful signal near the frequency of needs thus can be as much as possible retained in, and the interference signal of other frequencies is effective filtered out.
As schemed
2
Shown, upper waveform is the sampled signal waveform for pre-processing after filtering, and lower waveform is through the sampled signal data of over-sampling.After pre-processing after filtering, noise and interference signal to other frequencies are effectively filtered out, and obtain smooth data waveform.After pre-processing after filtering, signal is integrated with about
2bit
The time delay in cycle, size and the filter preprocessing unit of time delay
102
The computing capability of the filter preprocessing algorithm for being used and the processor for using is relevant.
Then, into step
603
, the change edge of the sampled signal for that will pre-process after filtering is reduced to generate digital signal waveform.Preferably, sampled signal is processed for the method using sampling extreme point.Signal value according to the continuous sampling point to sampled signal judges, it is determined that being currently at first transition or last transition.For example, when the signal value of the continuous sampling point of sampled signal constantly increases, then can determine to be currently at first transition, and the signal value for working as the continuous sampling point of sampled signal constantly reduces, then can determine to be currently at last transition.
Preferably, in step
603
, it is provided for distinguishing change threshold when first transition and last transition alternating change.Change threshold when first transition is reached and last transition alternately changes, carries out the upset of signal.For example, when the first transition that the signal value of the continuous sampling point in sampled signal constantly increases and when the signal value of subsequent continuous sampling point occur and being changed into constantly reducing, judge whether the amount that signal value reduces reaches change threshold, the upset of sampled signal is determined if change threshold is reached.Similarly, when the continuous sampling point in sampled signal the ever-reduced last transition of signal value and when there is the signal value of subsequent continuous sampling point and being changed into constantly increasing, judge whether the increased amount of signal value reaches change threshold, the upset of sampled signal is determined if change threshold is reached.Preferably, rational change threshold can be set according to factors such as signal quality, interference strength, neighbouring environment.Wherein, the amount that signal value reduces refers to the difference of neighbouring highest signal value and currency, and the increased amount of signal value refers to signal value from neighbouring lowest signal value and the difference of currency.
Due to
FM0
Data can all be overturn at the edge of signal, therefore initial level is
0
Or
1
Signal is not influenceed in itself.Preferably, in step
603
, by the way of extreme value judgement, can more efficiently reflect primary signal
/
The change moment of sampled signal.Because the processing method of digital comparator unit can effectively reflect the change moment of primary signal, therefore the recovery capability to primary signal dutycycle can also be effectively improved.
As schemed
3
Shown, upper waveform is the digital signal waveform by being obtained after analog-to-digital conversion, and lower waveform is the sampled signal waveform for pre-processing after filtering.Due to carrying out analog-to-digital conversion by the way of signal trend is judged, the digital signal waveform being converted to can approach the change moment of original signal waveform, can obtain good dutycycle.
Then, into step
604
, shaping is carried out to digital signal waveform, so as to effective filter out the burr signal in digital signal waveform, can more accurately reduce clean primary signal.Generally, the width of burr signal is less than the width half of normal signal, therefore in order to distinguish normal signal and burr signal, it is necessary to carry out effectively filtering out for burr according to the threshold value for setting, without causing the influence to normal signal in the case of change in duty cycle etc..Preferably, rational threshold value can be set according to factors such as signal quality, interference strength, neighbouring environment.Due to step
604
Burr in data signal is filtered, the issuable erroneous judgement of subsequent cell can be processed in order to subsequent cell and be reduced.
As schemed
4
Shown, the waveform of top is the digital signal waveform by being obtained after analog-to-digital conversion, and the waveform of lower section is by shaping unit
104
Digital signal waveform afterwards.Step
604
Burr signal for width less than certain threshold value, can effectively be filtered.
Then, into step
605
, the data signal by Shape correction is decoded, to obtain decoded signal and corresponding sampled clock signal.Sampled clock signal follows the edge of decoded signal to generate, and can be effectively prevented from accumulated error and tolerance bit rate skew, while the change of signal bit rate can be reduced to solving the influence of code system.Additionally, step
605
, it is necessary to judge whether the signal for receiving meets
FM0
Coding rule, for being unsatisfactory for
FM0
The signal of coding rule, carries out error abnormality processing.
As schemed
5
Shown, the top is the decoded signal by decoding, and centre is the sampled clock signal of generation, and bottom is by the signal of Shape correction.Due in step
605
The sampled clock signal for following decoded signal is generated, subsequent cell is obtained decoded signal, can effectively avoided accumulated error and reduce influence of the bit rate to decoding effect.
Then, into step
606
, decoded signal is parsed and the data to being obtained by parsing is stored.Additionally, step
606
Carry out data link layer except zero, enter abnormality processing if not being inconsistent normally, string turn is carried out if rule is met and is operated and is stored, be easy to subsequently carry out protocol processes.
Using anti-interference coding/decoding method of the invention can effectively improve for
FM0
The anti-interference of coded data solution code system, the effective receptivity for improving system.
Above to one kind provided by the present invention
FM0
The anti-interference coding/decoding method of coded data is described in detail, and the explanation of above example is only intended to help and understands the method for the present invention and its core concept.Simultaneously for those of ordinary skill in the art, thought of the invention will change in specific embodiments and applications, and in sum, this specification content should not be construed as limiting the invention.
Claims (10)
1. a kind of anti-interference coding/decoding method, including：
Base-band analog signal is sampled to obtain sampled signal；
Pretreatment is filtered to sampled signal to remove the interference signal not in frequency band, the sampled signal that acquisition is pre-processed after filtering；
The change edge of the sampled signal to pre-processing after filtering is identified generating data signal；
The noise signal of data signal is removed to obtain by the data signal of shaping；
Data signal by shaping is decoded, to obtain decoded signal and corresponding sampled clock signal；And
Decoded signal is parsed to generate communication data according to the corresponding sampled clock signal.
2. method according to claim 1, is being sampled before obtaining sampled signal, primary signal to be demodulated to obtain base-band analog signal to base-band analog signal.
3. method according to claim 1, the change edge of the sampled signal to pre-processing after filtering is identified including：Signal value according to the continuous sampling point to sampled signal judges, determines that sampled signal is in first transition or last transition.
4. method according to claim 3, wherein
When signal value of the sampled signal in first transition and subsequent continuous sampling point is changed into constantly reducing, judge whether the amount that signal value reduces reaches change threshold, the upset of sampled signal is determined if change threshold is reached；
When signal value of the sampled signal in last transition and subsequent continuous sampling point is changed into constantly increasing, judge whether the increased amount of signal value reaches change threshold, the upset of sampled signal is determined if change threshold is reached.
5. method according to claim 1, also including being stored to the communication data.
6. a kind of anti-interference decoding device, including：
AD sampling units, are sampled to obtain sampled signal to base-band analog signal；
Filter preprocessing unit, pretreatment is filtered to sampled signal to remove the interference signal not in frequency band, the sampled signal that acquisition is pre-processed after filtering；
Digital comparator unit, the change edge of the sampled signal to pre-processing after filtering is identified generating data signal；
Shaping unit, removes the noise signal of data signal to obtain by the data signal of shaping；
Signal decoding unit, decodes to the data signal by shaping, to obtain decoded signal and corresponding sampled clock signal；And
Data resolution unit, is parsed to generate communication data according to the corresponding sampled clock signal to decoded signal.
7. equipment according to claim 6, the anti-interference decoding device is connected with modem, the modem is demodulated to primary signal to obtain base-band analog signal, and the base-band analog signal is sent to the AD sampling units of anti-interference decoding device.
8. equipment according to claim 6, the change edge of sampled signal of the digital comparator unit to pre-processing after filtering is identified including：Signal value according to the continuous sampling point to sampled signal judges, determines that sampled signal is in first transition or last transition.
9. equipment according to claim 8, wherein
When signal value of the sampled signal in first transition and subsequent continuous sampling point is changed into constantly reducing, judge whether the amount that signal value reduces reaches change threshold, the upset of sampled signal is determined if change threshold is reached；
When signal value of the sampled signal in last transition and subsequent continuous sampling point is changed into constantly increasing, judge whether the increased amount of signal value reaches change threshold, the upset of sampled signal is determined if change threshold is reached.
10. equipment according to claim 6, the anti-interference decoding device also includes memory cell, and the memory cell is stored to the communication data.
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