CN108075829B - A kind of variable slot pulse position modulation device, method and laser communication system - Google Patents
A kind of variable slot pulse position modulation device, method and laser communication system Download PDFInfo
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- CN108075829B CN108075829B CN201711324983.4A CN201711324983A CN108075829B CN 108075829 B CN108075829 B CN 108075829B CN 201711324983 A CN201711324983 A CN 201711324983A CN 108075829 B CN108075829 B CN 108075829B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
Abstract
The present invention relates to a kind of variable slot pulse position modulation device, method and laser communication systems, what is solved is the low technical problem of safety, by using including sequentially connected data base-band coding input module, variable slot coding processing unit and laser module；Variable slot pulse position modulation device receives data information, it carries out being encoded to TTL signal using data base-band coding input module, a frame data time slot allocation is instructed using different leading codes, data information is loaded on into the pulse code of the pulse position composition of different time-gap number to control laser transmitting laser, it is added in the front end for sending data and shows that the leading code of data slot type forms communication frame, recipient judges the data slot type being currently received by leading code, the technical solution for the real data that subsequent pulse represents is judged further according to time slot position state, preferably resolve the problem, it can be used in the laser communications such as atmospheric channel or extra large gas channel.
Description
Technical field
The present invention relates to laser communication fields, and in particular to a kind of variable slot pulse position modulation device, method and swashs
Optical communication system.
Background technique
Using the communication technology of light carrier have quickly, electromagnetism interference, mobility be strong, high reliablity, be substantially carried out number
According to, image transmitting, in each field extensive application.It is to pass through nothing for field and particular surroundings, such as subsurface communication feature
Line mode transmits instruction type information, and information content is small, but needs safety and reliability high, and the laser of various modulation systems is logical
Letter technology is applied.
The pulse position modulation of existing use, i.e. PPM modulation have high optical power and band efficiency, can improve transmission
The anti-interference ability of channel, it is that information coding is indicated using time slot position variation, and transmission can for opposite wireless communications environment
It is stronger by property and safety, but this PPM modulation mode is the transmission mode of fixed time slot, and there are the low technologies of safety to ask
Topic.Therefore one kind highly-safe pulse position modulation device, method and laser communication system are provided with regard to necessary.
Summary of the invention
The technical problem to be solved by the present invention is to safety low technical problems existing in the prior art.It provides a kind of new
Variable slot pulse position modulation device, the variable slot pulse position modulation device with high security the characteristics of.
In order to solve the above technical problems, the technical solution adopted is as follows:
A kind of variable slot pulse position modulation device, the variable slot pulse position modulation device include being sequentially connected
Data base-band coding input module, variable slot coding processing unit and laser module；The data base-band coding input mould
Block is used for the byte code and level conversion of information；The variable slot coding processing unit is used for received baseband coding
Signal processing is that time slot frame combinational code controls laser module；The laser module is controlled by the realization of variable slot coding processing unit
Laser signal output.
The working principle of the invention: using time-gap pulsing position modulation is become, by the way that digital information is loaded on different time-gap
The pulse code of several pulse position compositions emits laser to control laser module, guarantees certain pulsed laser energy, is sending out
Send the front end of data that the leading code composition communication frame for showing data slot type is added, recipient is currently connect by the judgement of leading code
The data slot type received judges the real data that subsequent pulse represents further according to time slot position state, makes communicating pair
The reliability and confidentiality of information are centainly ensured, mention the security reliability that information is transmitted under open channel environment further
Height, communication have more practicability with control technology.
Above scheme, for optimization, further, the variable slot coding processing unit is using single-chip microcontroller as core, monolithic
Machine is generated for completing timeslot number processing, the distribution of leading code, time slot code combination and modulation pulse zero code.
The present invention also provides a kind of variable slot pulse position modulating method, the variable slot pulse position modulating method
Based on variable slot pulse position modulation device, modulator approach the following steps are included:
Step 1: data base-band coding input module will input information and carry out byte code and level conversion, obtain base band volume
Code signal；
Step 2: variable slot coding processing unit defines multi-slot typelib, defines leading code pulse spacing and multi-slot
The functional relation of type；
Step 3: variable slot coding processing unit carries out timeslot number processing, and timeslot number processing includes generating leading
Code selectes corresponding multi-slot type according to leading code and function relationship, according to multi-slot type and base in multi-slot typelib
Band encoded signal carries out byte bit grouping, obtains time slot frame combinational code, successively connects into leading code and time slot frame combinational code
The modulation pulse of different frame structures, modulation pulse are TTL data pulse；
Step 4: modulation pulse being sent to laser module, laser module is controlled by modulation pulse and issues laser signal；
Step 5: variable slot coding processing unit generates leading code, repeats step 3- step 4, until modulation terminates.
Include the pulse position modulation coding structure of multi-slot type using single byte, becomes according to fixed or random time slot
Changing rule is that unit carries out framing according to byte to data information, exports and is suitble to driving high power laser module serial code element, real
The pulse position coded modulation of existing laser；Since the type and quantity of the pulse position modulation signal that is included in single byte be not solid
Fixed, so this frame structure is a kind of random length frame format in the time domain, i.e. the frame length of different data transmission is not fixed.It will count
The mode for becoming time slot accordingly carries out pulse position modulation, designs reasonable communications data frame composite structure, further increases communication
Level security；Frame leading code is added before the data, so that recipient's judgement is currently received the timeslot number type of pulse,
Accurately data are demodulated.
Further, the definition multi-slot typelib includes several multi-slot types, and the multi-slot type is PPM
At least one optional mode in modulation system, the sum of corresponding place value of selected PPM modulation mode are 8；Wherein, PPM modulation side
Formula has 4PPM modulation, 8PPM modulation, 16PPM modulation and 256PPM modulation；The position of place value t1=2, the 8PPM modulation of 4PPM modulation
The place value t4=8 of place value t3=4, the 256PPM modulation of value t2=3,16PPM modulation.
Further, the width in the leading code pulse spacing is greater than the repetition period of the laser module, is less than simultaneously
The effective time pulse width of data slot signal.
Further, the modulation pulse is zero code TTL serial structure.
Further, the byte code includes that will input information preservation for array, and each of array number is defined
For a byte, each frame in array is arranged according to the sequence of big-endian.
Further, the target level of the level conversion is Transistor-Transistor Logic level.
The present invention also provides a kind of laser communication system, the laser communication system includes variable slot pulse above-mentioned position
Modulating device is set, the input terminal of the variable slot pulse position modulation device is connected with data source；The data source is for defeated
Enter information；The variable slot pulse position modulation device uses variable slot pulse position modulating method above-mentioned.Wherein, may be used
Become the transmitting terminal that time-gap pulsing position modulation device is located at laser communication system, accordingly, the receiving end of laser communication system is
Variable slot pulse position demodulating equipment, variable slot pulse position demodulating equipment principle and variable slot pulse position modulation fill
Set it is similar, demodulating process be modulated process reverse direction.
Laser communication system in the present invention is mainly used for atmospheric channel or extra large gas channel.Extra large gas channel is seawater and atmosphere
Mixed channel.
Beneficial effects of the present invention:
Data are carried out in a manner of becoming time slot pulse position modulation, design the communications data frame of specific change by effect one
Composite structure improves the safety and confidentiality of communication；
Effect two, laser module drive module improve laser module driving capability, and it is defeated to complete laser module modulation time slot code
Out, and then high-power communication is realized；
Effect three can reduce the bit error rate by the limitation for leading code interval, improve communication stability.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1, variable slot pulse position modulation schematic device.
Fig. 2, variable slot pulse position modulating method schematic diagram.
Fig. 3, variable slot pulse position modulating method endless form schematic diagram.
Fig. 4, leading code schematic diagram.
Fig. 5, laser communication system schematic diagram.
Fig. 6, variable slot pulse position modulation device workflow schematic diagram.
Fig. 7, embodiment 1 transmit the frame schematic diagram of data 01010011.
Fig. 8, embodiment 2 transmit the frame schematic diagram of data 01010011.
Fig. 9, embodiment 3 transmit the frame schematic diagram of data 01010011.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
Embodiment 1
The present embodiment provides a kind of variable slot pulse position modulation device, such as Fig. 1, the variable slot pulse position tune
Device processed includes sequentially connected data base-band coding input module, variable slot coding processing unit and laser module；It is described
Data base-band coding input module is used for the byte code and level conversion of information；The variable slot coding processing unit is used
In by received baseband coding signal processing be time slot frame combinational code control laser module；When the laser module is controlled by variable
Gap coding processing unit realizes laser signal output.
The workflow of the present embodiment: such as Fig. 6, variable slot pulse position modulation device receives data information as input
Information, including voice, picture character etc. carry out being encoded to baseband coding signal using data base-band coding input module, pass through
Level conversion, baseband coding signal become Transistor-Transistor Logic level signal, using the pulse leading code of different time intervals come guide data
Framing swashs the pulse code that data information loads on the pulse position composition of different time-gap number to control laser module transmitting
Light.It is added in the front end for sending data and shows that the leading code of data slot type forms communication frame, recipient is sentenced by leading code
The disconnected data slot type being currently received judges the real data that subsequent pulse represents further according to time slot position state, makes
The reliability and confidentiality of communicating pair information are centainly ensured, the security reliability that information is transmitted under open channel environment is made
It further increases, communication has more practicability with control technology.
Wherein, the variable slot coding processing unit is using single-chip microcontroller as core, and single-chip microcontroller is for completing at timeslot number
Reason, the distribution of leading code and time slot code combination.
The present embodiment also provides a kind of variable slot pulse position modulating method, and the modulator approach is based on above-mentioned variable
Time-gap pulsing position modulation device, such as Fig. 2, modulator approach the following steps are included:
Step 1: data base-band coding input module will input information and carry out byte code and level conversion, obtain base band volume
Code signal；
Step 2: variable slot coding processing unit defines multi-slot typelib, defines leading code pulse spacing and multi-slot
The functional relation of type；
Step 3: variable slot coding processing unit carries out timeslot number processing, and timeslot number processing includes generating leading
Code selectes corresponding multi-slot type according to leading code and function relationship, according to multi-slot type and base in multi-slot typelib
Band encoded signal carries out byte bit grouping, obtains time slot frame combinational code, successively connects into leading code and time slot frame combinational code
The modulation pulse of long-frame structure when different, modulation pulse are TTL data pulse；
Step 4: modulation pulse being sent to laser module, laser module is controlled by modulation pulse and issues laser signal；
Step 5: variable slot coding processing unit generates leading code, repeats step 3- step 4, until modulation terminates.
The modulator approach can greatly improve the complexity of modulated signal, rely on the time slot type of variation, and seem
Irregular time slot variation, it is ensured that intercepted and captured by other side and be still difficult to decode.
In detail, the multi-slot structure of the leading code is that the data slot type of a frame is characterized with its pulse spacing, such as
Fig. 4, the interval time of 2 leading codes are Δ t, relationship one function library of composition of Δ t and multi-slot type.Define multi-slot class
The rule in type library is to select at least one in PPM modulation mode, and the sum of corresponding place value of selected PPM modulation mode is 8, right
Answering a byte is 8bit.
Accordingly, using 1 byte 8bit as unit framing.Then each sending time slots correspond to 2bit data for 4PPM modulation,
8PPM modulation then sends 3bit data every time, and 16PPM modulation then sends 4bit data every time, and 256PPM modulation is then sent every time
8bit data.Therefore, it defines 4PPM and modulates corresponding place value t1=2,8PPM modulates corresponding place value t2=3, and 16PPM modulates corresponding position
Value t3=4,256PPM modulate corresponding place value t4=8.Therefore, multi-slot types of database includes 2bit, 2bit, 4bit；2bit,
4bit, 2bit；4bit, 2bit, 2bit；2bit, 3bit, 3bit；3bit, 3bit, 2bit；3bit, 2bit, 3bit；4bit,
4bit；8bit；Multi-slot types of database and Δ t are established into functional relation, then have Δ t1=2bit, 2bit, 4bit；Δ t2=
2bit, 4bit, 2bit；Δ t3=4bit, 2bit, 2bit；Δ t4=2bit, 3bit, 3bit；Δ t5=3bit, 3bit,
2bit；Δ t6=3bit, 2bit, 3bit；Δ t7=4bit, 4bit；Δ t8=8bit.
Wherein, the byte code includes saving the signal of input with array form, and each of array number is fixed
Justice is a byte, and each frame in array is arranged according to the sequence of big-endian.
In the present embodiment, it is 20ms that the pulse spacing Δ t of leading code, which takes Δ t1, then corresponding multi-slot type is 2bit,
2bit, 4bit.Assuming that the corresponding byte code of a number of the quasi- transmission of the present embodiment is 01010011, then according to multi-slot type
Rule, baseband coding signal are divided into 01,01,0011.According to PPM modulation principle, 4PPM modulation then indicates that position has 00,
01,10,11；8PPM modulation indicates that there is 000,001...111 in position；Similarly 16PPM modulation indicates that position has 0000,
0001...1111；256PPM modulation indicates that there is 00000000,00000001...11111111 in position.And the present embodiment transmission
2 are 01 before baseband coding Signal coding, and the position that corresponding data time-gap pulsing occurs is after second end-of-pulsing of leading code
01 position in the 4PPM modulating-coding sequence of beginning；Similarly, the third position of baseband coding, the 4th then appear in first
01 position in 4PPM modulating-coding sequence after time-gap pulsing；The 5th of baseband coding then appears in the 8th
0011 position in 16PPM modulating-coding sequence after two time-gap pulsings.Therefore, the present embodiment is by the number of a byte
It is believed that ceasing time slot frame pulse structure such as Fig. 7 after using variable slot pulse position modulating method to encode for not comprising leading code
When, a frame code position sequence is arranged as 00,01,00,01,0000,0001,0010,0011.Wherein behind the 0011 of frame end then into
The leading code of the next data frame of row.
For the interference for avoiding leading code from identifying data, it is preferable that the pulse spacing width of the leading code should be greater than swashing
The optical module repetition period, and it is less than the effective time pulse width of data slot signal.Wherein the laser module repetition period represents
The highest modulating performance of laser module causes laser speed not catch up with tune if leading code interval is less than the laser repetition period
Speed processed is likely to result in loss of data, correspondingly, is limited its interval again by receiving end sampling rate and should be less than data slot letter
Number effective time pulse width.When leading code meets the condition simultaneously, then this data transfer mode can effectively reduce mistake
Code rate.
Wherein, the modulation pulse is zero code TTL serial structure.
Using variable slot pulse position modulation device above-mentioned and modulator approach, a laser communication system may be constructed
System, such as Fig. 5, laser communication system further include the data source for being connected to front end, and data source is used to input data information and gives data base
Band coding input module carries out the pretreatment such as encoding.
Wherein, laser communication system can more play the excellent of its high security and confidentiality for atmospheric channel or extra large gas channel
Point.
Embodiment 2
The present embodiment further illustrates that the different leading code pulse spacings select different multi-slot classes on the basis of embodiment 1
Type will will lead to the different data frame of length, to improve the safety of data.
Wherein, the data of this transmission remain as 01010011.It is 24ms that the pulse spacing Δ t of leading code, which takes Δ t2, then
Corresponding multi-slot type is 2bit, 4bit, 2bit.Then according to multi-slot typing rule, baseband coding signal is divided into 01,
0100,11.According to PPM modulation principle, 4PPM modulation then indicates that position has 00,01,10,11；8PPM modulation indicates that position has
000,001...111；Similarly 16PPM modulation indicates that there is 0000,0001...1111 in position；256PPM modulation indicates that position has
00000000,00000001...11111111.And the baseband coding Signal coding of the present embodiment transmission is 01010011, preceding 2
Position is 01, and the 4PPM modulating-coding that the position that corresponding data time-gap pulsing occurs starts after second end-of-pulsing of leading code is suitable
01 position in sequence；Similarly, the third position of baseband coding Signal coding to and the 6th data pulse then appear in first
0100 position in 16PPM modulating-coding sequence after a time-gap pulsing；Last two data of baseband coding signal
Pulse then appear in second time-gap pulsing after 4PPM modulation order in 11 positions.Therefore, the present embodiment is by one
The data information of byte use variable slot pulse position modulating method encode after time slot frame pulse structure such as Fig. 8 for not comprising
When leading code, a frame code position sequence is arranged as 00,01,0000,0001,0010,0011,0100,00,01,10,11.Wherein
Then enter the leading code of next data frame behind the 11 of frame end.
Embodiment 3
The present embodiment further illustrates that the different leading code pulse spacings select different multi-slot classes on the basis of embodiment 1
Type will will lead to the different data frame of length, to improve the safety of data.
Wherein, the data of this transmission remain as 01010011.It is 27ms that the pulse spacing Δ t of leading code, which takes Δ t7, then
Corresponding multi-slot type is 4bit, 4bit.Then according to multi-slot typing rule, baseband coding signal is divided into 0101,
0011.According to PPM modulation principle, 4PPM modulation then indicates that position has 00,01,10,11；8PPM modulation indicates that position has 000,
001...111；Similarly 16PPM modulation indicates that there is 0000,0001...1111 in position；256PPM modulation indicates that position has
00000000,00000001...11111111.And the baseband coding Signal coding of the present embodiment transmission is 01010011, preceding 4
Position is 0101, and the 16PPM modulation that the position that corresponding data time-gap pulsing occurs starts after second end-of-pulsing of leading code is compiled
0101 position in code sequence；Similarly, four data pulses then appear in first time slot after baseband coding Signal coding
0011 position in 16PPM modulating-coding sequence after end-of-pulsing.Therefore, the present embodiment adopts the data information of a byte
When with time slot frame pulse structure such as Fig. 9 after variable slot pulse position modulating method coding for not comprising leading code, a frame code
Sequence of positions is arranged as 0000,0001,0010,0011,0100,0101,0000,0001,0010,0011.Wherein frame end
Then enter the leading code of next data frame after 0011.
It can be seen that by the comparison of embodiment 1, embodiment 2 and embodiment 3, even if being in time the same baseband coding signal, choosing
It with different leading codes, that is, selects the different leading code pulse spacings, then the length of the data frame exported is variation.To,
A possibility that data are decrypted by violence, the safety of improve data transfer can be greatly lowered.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the range of specific embodiment, to the common skill of the art
For art personnel, as long as long as various change the attached claims limit and determine spirit and scope of the invention in, one
The innovation and creation using present inventive concept are cut in the column of protection.
Claims (10)
1. a kind of variable slot pulse position modulation device, it is characterised in that: the variable slot pulse position modulation device packet
Include sequentially connected data base-band coding input module, variable slot coding processing unit and laser module；
The data base-band coding input module is used for the byte code and level conversion of information；
The variable slot coding processing unit, for being that the control of time slot frame combinational code swashs by received baseband coding signal processing
Optical module, the time slot frame combinational code include the pulse position of different time-gap number；
The laser module is controlled by variable slot coding processing unit and realizes laser signal output.
2. variable slot pulse position modulation device according to claim 1, it is characterised in that: the variable slot coding
Processing unit is using single-chip microcontroller as core, and single-chip microcontroller is for completing timeslot number processing, the distribution of leading code, time slot combination and modulation arteries and veins
Rush zero code generation.
3. a kind of variable slot pulse position modulating method, it is characterised in that: the variable slot pulse position modulating method base
In any variable slot pulse position modulation device of claim 1-2, modulator approach the following steps are included:
Step 1: data base-band coding input module will input information and carry out byte code and level conversion, obtain baseband coding letter
Number；
Step 2: variable slot coding processing unit defines multi-slot typelib, defines leading code pulse spacing and multi-slot type
Functional relation；
Step 3: variable slot coding processing unit carries out timeslot number processing, and timeslot number processing includes generating leading code, root
Corresponding multi-slot type is selected in multi-slot typelib according to leading code and function relationship, according to multi-slot type and baseband coding
Signal carries out byte bit grouping, obtains time slot frame combinational code, and leading code and time slot frame combinational code are successively connected into different frame
The modulation pulse of structure, modulation pulse are TTL data pulse；
Step 4: modulation pulse being sent to laser module, laser module is controlled by modulation pulse and issues laser signal；
Step 5: variable slot coding processing unit generates leading code, repeats step 3- step 4, until modulation terminates.
4. variable slot pulse position modulating method according to claim 3, it is characterised in that: the multi-slot of the definition
Typelib includes several multi-slot types, and the multi-slot type is at least one optional mode in PPM modulation mode, selected
The sum of corresponding place value of PPM modulation mode is 8；
Wherein, PPM modulation mode has 4PPM modulation, 8PPM modulation, 16PPM modulation and 256PPM modulation；The place value of 4PPM modulation
The place value t4=8 of place value t3=4, the 256PPM modulation of place value t2=3, the 16PPM modulation of t1=2,8PPM modulation.
5. variable slot pulse position modulating method according to claim 4, it is characterised in that: between the leading code pulse
Every width be greater than the laser module the repetition period, while be less than data slot signal effective time pulse width.
6. variable slot pulse position modulating method according to claim 4, it is characterised in that: the modulation pulse is to return
Zero code TTL serial structure.
7. variable slot pulse position modulating method according to claim 4, it is characterised in that: the byte code includes
Will input information preservation be array, by each of array number be defined as a byte, by each frame in array according to by
The sequence of a high position to low level arranges.
8. variable slot pulse position modulating method according to claim 4, it is characterised in that: the mesh of the level conversion
Marking level is Transistor-Transistor Logic level.
9. a kind of laser communication system, it is characterised in that: the laser communication system includes of any of claims 1 or 2 variable
The input terminal of time-gap pulsing position modulation device, the variable slot pulse position modulation device is connected with data source；The number
According to source for inputting information；
The modulator approach of the variable slot pulse position modulation device is using the variable slot any in claim 3-8
Pulse position modulating method.
10. laser communication system according to claim 9, it is characterised in that: the laser communication system is believed for atmosphere
Road or extra large gas channel.
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| JP2004528784A (en) * | 2000-11-17 | 2004-09-16 | アロプティック、インク． | Point-to-multipoint passive optical network using variable length packets and variable length upstream time slots |
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| DE602007004063D1 (en) * | 2007-02-06 | 2010-02-11 | Oerlikon Space Ag | Optical high-rate pulse position modulation scheme and optical communication system based thereon |
| CN103501201B (en) * | 2013-09-03 | 2016-01-06 | 华南理工大学 | A kind of frequency hopping arteries and veins position based on linear FM signal coding underwater acoustic communication method |
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| CN105119655A (en) * | 2015-08-31 | 2015-12-02 | 华南理工大学 | Visible light communication method based on QAM and MPPM and system thereof |
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