CN107395286A - Optical communication system and modulator approach based on CDMA Yu CSK dual modulations - Google Patents
Optical communication system and modulator approach based on CDMA Yu CSK dual modulations Download PDFInfo
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- CN107395286A CN107395286A CN201710597900.2A CN201710597900A CN107395286A CN 107395286 A CN107395286 A CN 107395286A CN 201710597900 A CN201710597900 A CN 201710597900A CN 107395286 A CN107395286 A CN 107395286A
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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
- H04B10/5161—Combination of different modulation schemes
-
- 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
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
-
- 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
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
Abstract
The invention discloses a kind of optical communication system based on CDMA Yu CSK dual modulations, including：Transmitting subsystem, transmission subsystem and the receiving subsystem being sequentially connected, described transmitting subsystem include：Embedded system, 4 × 4RGB LED arrays, LED drive circuit.It is a kind of to be applied to the modulator approach based on CDMA Yu the optical communication system of CSK dual modulations, comprise the following steps：1st, it is converted into the data signal P for representing tri- kinds of color color depths of RGBR、PGAnd PB；2nd, to the data signal P of gainedR、PGAnd PBOrthogonal intersection is respectively adopted to be spread, the spread-spectrum signal of the different user for belonging to same color of gained is added again, and add an appropriate offset for the spread-spectrum signal after being added so that the value of each of the spread-spectrum signal always exported is between 0 255.The advantages that present invention has broad application prospects.
Description
Technical field
The present invention relates to technical field of visible light communication, more particularly to a kind of light based on CDMA and CSK dual modulations leads to
Letter system and modulator approach.
Background technology
In recent years, as the rapid development of LED illumination industry, LED are widely used in all trades and professions, progressively take
For traditional incandescent lighting.Compared with the light sources such as traditional incandescent lamp, LED has low small volume, power consumption, long lifespan, brightness
The advantages that high, green.Importantly, LED, which also has, responds the advantages of sensitive, modulating performance is good, this to be based on LED
The visible light communication technology of light source is possibly realized.
With traditional radio frequency compared with the communication technology such as infrared, VLC have influence to human body and precision instrument it is small, need not
Apply for frequency spectrum resource, the advantages that confidentiality is high.And because high-frequency modulation causes human eye None- identified, thus VLC systems
Communication and illumination dual-use function are had concurrently.
However, traditional visible light communication system uses OOK modulation techniques, it is respectively with fluorescent material LED, photodiode
Luminescent device and light detecting device, there are many limitations.First, traditional OOK modulation, each signal can only transmit 1bit's
Data so that the capacity of VLC systems is relatively low, further encounters monochromatic relevant and is easily asked by ambient light interference in addition
Topic.In addition, although PD can realize highly sensitive photoelectric respone, so as to realize high speed visible light communication, also easily simultaneously
Disturbed by ambient light, it is difficult to increase the bit error rate of VLC systems with avoiding.Further, traditional use OOK is modulated
Same data can only be transmitted in the visible light communication system same time of technology to one or more users.
The content of the invention
In order to overcome the disadvantages mentioned above of prior art and deficiency, primary and foremost purpose of the invention is that proposing one kind is based on
CDMA and the optical communication system of CSK dual modulations, the optical communication system add CDMA modulation skills on the basis of CSK modulation
Art so that multi-user can access VLC systems simultaneously and obtain different data.
In order to overcome the disadvantages mentioned above of prior art and deficiency, another object of the present invention is to propose one kind to be applied to
Modulator approach based on CDMA Yu the optical communication system of CSK dual modulations.
The primary and foremost purpose of the present invention is achieved through the following technical solutions：A kind of light based on CDMA and CSK dual modulations leads to
Letter system, including：Transmitting subsystem, transmission subsystem and the receiving subsystem being sequentially connected, it is characterised in that described transmitting
Subsystem includes：Embedded system, 4 × 4RGB-LED arrays, LED drive circuit；Described receiving subsystem includes：Multiple bands
There are the mobile terminal of cmos image sensor, infrared filter, cmos image sensor, ADC analog-digital converters, CDMA solution mode transfers
Block and CSK decoder modules；The embedded system includes：CSK modulation modules, CDMA modulation modules and DAC digital-to-analogue converters；
The CSK modulation modules, CDMA modulation modules, DAC digital-to-analogues converter, LED drive circuit and 4 × 4RGB-LED battle arrays
Row are sequentially connected；4 × 4RGB-LED arrays connect infrared filter by transmission subsystem；The infrared filter,
Cmos image sensor, ADC analog-digital converters and CDMA demodulation modules and CSK decoder modules are sequentially connected；
Described LED drive circuit is current signal transfer to 4 × 4RGB-LED array phases；Described transmission subsystem will
The visible light signal that dual modulation is carried out by CSK modulation modules and CDMA modulation modules passes to cmos image sensor；Institute
The embedded system stated is by programming, to initial data progress CDMA and CSK dual modulation, by the original number of dual modulation
Turn into analog signal according to DAC digital analog converters are first passed through, then current signal, the electric current letter are converted into by LED drive circuit
Number driving 4 × 4RGB-LED arrays to send visible light signal, described cmos image sensor and 4 × 4RGB-LED arrays it
Between coupled by visible light signal, described cmos image sensor will be seen that optical signal is converted into electric signal, the electricity
Signal is converted to data signal by ADC analog-digital converters, and the data signal passes through CDMA demodulation modules and CSK decoder modules
Signal demodulation is carried out, to obtain final reception signal.
Described embedded system will be transferred to the data progress CSK and CDMA of different user dual modulation, with
To spread-spectrum signal；Described spread-spectrum signal becomes analog signal by DAC digital analog converters, and the analog signal driving 4 ×
4RGB-LED arrays send visible light signal.The visible light signal that the transmission subsystem is transmitted, is filtered by infrared filter
Cmos image sensor is transferred to after ripple again.The transmission subsystem can be free space, have ring in the free space
Disturb light in border.The cmos image sensor is when will be seen that optical signal is converted into analog electrical signal, the 256 of tri- components of RGB
Rank color depth is judged using certain spacing as indexing.When a certain component color depth of visible light signal that receiving subsystem receives exists
When between 50-70,60 can be taken to be used as reception value.
The specific modulation system of the CDMA modulation modules is：In each intelligent terminal, when spread-spectrum signal removes modulation
Added offset, then the orthogonal intersection with each being held carry out inner product operation, acquired results again divided by spreading code length
Degree, then obtain the color depth of required tri- kinds of colors of RGB by CSK modulation.
The specific modulation system of the CSK modulation modules is：The value of the color depth of tri- kinds of colors of RGB is modulated according to CSK
Coded system is decoded, that is, obtains the binary data finally transmitted to the user.
Another object of the present invention is achieved through the following technical solutions：One kind is applied to based on CDMA and CSK dual modulations
Optical communication system modulator approach, specifically may comprise steps of：
Step 1, in embedded systems, transmits every two of the binary data to different user by certain coding staff
Formula, it is separately converted to represent the data signal P of tri- kinds of color color depths of RGBR、PGAnd PB；
Step 2, the data signal P to gainedR、PGAnd PBOrthogonal intersection is respectively adopted to be spread, then the category by gained
It is added in the spread-spectrum signal of the different user of same color, and an appropriate compensation is added for the spread-spectrum signal after being added
Value so that the value of each of the spread-spectrum signal always exported is between 0-255.
The present invention represents the color depth of tri- kinds of colors of RGB using the data of 8, and the color depth of each color has 28Individual grade,
I.e.：256 rank color depths.
The CDMA modulation of the present invention is CDMA, and data are provided simultaneously for multiple users using the orthogonality of spread spectrum coding
Transmission.The CSK, i.e. gamut keying, difference is represented using the different ratio of RGB-LED lamp red, green, blue three primary colours color depths
Binary data, recycle CDMA modulation by different data transfers into multi-user's hand.Modulated compared to traditional OOK,
The data volume that CSK modulation is included by adding each clock cycle signal, so as to add the capacity of VLC systems；It is a variety of
The application of color it also avoid monochromatic coherence problems；CSK modulation also has the lower bit error rate than traditional OOK modulation,
Especially in the environment of high s/n ratio.And the application of CDMA modulation for multi-user while accesses VLC systems and provides a kind of solution
Certainly scheme, and add the antijamming capability of VLC systems.
Compared with prior art, the present invention has advantages below and beneficial effect：
1st, the present invention uses the mobile terminal with cmos image sensor camera as receiving terminal, and at present on the market
Smart mobile phone nearly all equipped with this camera, smart mobile phone is in China's quite popularization.Compared to traditional VLC systems
System uses PD, and as light detecting device, for the present invention without specially building receiving subsystem again, this causes the cost of the VLC systems
It is greatly lowered and application surface also greatly extends, has broad application prospects.
2nd, CSK modulation techniques of the present invention, compared with traditional OOK modulation techniques, included per optical signal
Data volume adds, so as to add the capacity of VLC systems.
3rd, the present invention adds CDMA modulation in CSK modulation techniques, is caused using the orthogonality of CDMA modulation spreading codes more
User can access same VLC systems and receive different data.
4th, CDMA the and CSK dual modulation technologies that the present invention uses, compared with traditional OOK modulation, there is lower mistake
Code check, especially under conditions of high signal/noise ratio.
Brief description of the drawings
Fig. 1 is system block diagram described in the invention.
Fig. 2 a are the diagram of the CSK modulation and demodulation processes of the present invention.
The diagram of the CDMA modulation and demodulation processes of Fig. 2 b present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in figure 1, a kind of optical communication system based on CDMA Yu CSK dual modulations, including：Transmitting being sequentially connected
System, transmission subsystem and receiving subsystem, described transmitting subsystem include：Embedded system, 4 × 4RGB-LED arrays,
LED drive circuit；Described receiving subsystem includes：Infrared filter, cmos image sensor, ADC analog-digital converters, CDMA
Demodulation module and CSK decoder modules；The embedded system includes：CSK modulation modules, CDMA modulation modules and DAC digital-to-analogues turn
Change device；The CSK modulation modules, CDMA modulation modules, DAC digital-to-analogues converter, LED drive circuit and 4 × 4RGB-LED arrays
It is sequentially connected；4 × 4RGB-LED arrays connect infrared filter by transmission subsystem；The infrared filter, CMOS
Imaging sensor, ADC analog-digital converters and CDMA demodulation modules and CSK decoder modules are sequentially connected；Described LED drive circuit
Current signal transfer to 4 × 4RGB-LED array phases；Described transmission subsystem will pass through CSK modulation modules and CDMA is modulated
The visible light signal that module carries out dual modulation passes to cmos image sensor；Described embedded system is right by programming
Initial data carries out CDMA and CSK dual modulation, and the initial data by dual modulation, which first passes through DAC digital analog converters, to be turned into
Analog signal, then current signal is converted into by LED drive circuit, the current signal drives 4 × 4RGB-LED arrays to send out
Go out visible light signal, coupled between described cmos image sensor and 4 × 4RGB-LED arrays by visible light signal,
Described cmos image sensor will be seen that optical signal is converted into electric signal, and the electric signal is changed by ADC analog-digital converters
For data signal, the data signal carries out signal demodulation by CDMA demodulation modules and CSK decoder modules, to obtain most terminating
The collection of letters number.
The embedded system of the present invention uses STM32, and the mobile terminal with cmos image sensor uses smart mobile phone.
As shown in table 1, among STM32, the binary data stream 1,2 for belonging to user 1,2 is entered in units of each two position
Row CSK is modulated.In the present embodiment, STM32 transmits binary data 00 to user 1, and binary data 11 is transmitted to user two.
It is exactly to transmit color 1, corresponding (60,40,0) to user 1；Color 4, corresponding (0,60,20) are transmitted to user 2.
Table 1
In STM32, by the recurrence formula of hadamard matrix：
Produce mutually orthogonal Walsh codes (1 1-1-1), (1-1-1 1).Wherein H2nFor the Hadamard square of 2n ranks
Battle array, n >=1, n are positive integer, order：
H1=1,
Then, as n=1, have：
Have as n=2：
Take above-mentioned 4 rank hadamard matrix the 3rd, the 4th behavior vector as the Walsh codes in this example.With mutually orthogonal
Walsh codes are multiplied by the color of tri- kinds of colors of RGB of color 1 and color 4 as spreading code (1 1-1-1), (1-1-1 1) respectively
It is deep, such as PB, obtain spread-spectrum signal (40 40-40-40), (60-60-60 60).Further, by each spread-spectrum signal
Everybody is added, and obtains (100-20-100 20).Further, the spread-spectrum signal after will add up adds an offset+120,
The size of offset is determined on a case-by-case basis, and the value of each is caused after addition between 0-255, the numeral always exported
Signal is (220 100 20 140), and total process of CDMA and CSK dual modulations is as shown in Figure 2 a.
The data signal always exported is converted into analog electrical signal by described DAC digital analog converters, in LED drive circuit
Drive corresponding PR、PG、PBSend visible light signal.
In the smart mobile phone of user 1 and user 2, the visible light signal that 4 × 4RGB-LED arrays are sent is through receiving and distributing
The infrared filter filtering that machine camera carries, then will be seen that light is believed respectively by cmos image sensor, ADC analog-digital converters
Number it is converted into analog electrical signal, analog electrical signal is converted into digital spread spectrum signal (220 100 20 140).
As shown in Figure 2 b, for user 1, its corresponding spreading code is (1 1-1-1).Offset 120 is removed first to obtain
To (100-20-100 20), it is 160 with the inner product of corresponding spreading code.Again by the length 4 of 160 divided by Walsh codes, obtain
40, the as P corresponding to color 1G.And then CSK can be carried out by decoding process corresponding to upper table and demodulate to obtain binary number
According to 00.Similarly, for user 2, its corresponding spreading code is (1-1-1 1), first remove compensation be worth to (100-20-
100 20), and it is 240 with the inner product of corresponding spreading code, divided by the length 4 of spreading code obtains 60, P as corresponding to color 2G。
CSK can be similarly carried out to demodulate to obtain binary data 11.
Above-described embodiment is only one embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplify it is equal
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of optical communication system based on CDMA Yu CSK dual modulations, including：Transmitting subsystem, transmission being sequentially connected
System and receiving subsystem, it is characterised in that described transmitting subsystem includes：Embedded system, 4 × 4RGB-LED arrays,
LED drive circuit；Described receiving subsystem includes：Infrared filter, cmos image sensor, ADC analog-digital converters, CDMA
Demodulation module and CSK decoder modules；The embedded system includes：CSK modulation modules, CDMA modulation modules and DAC digital-to-analogues turn
Change device；
The CSK modulation modules, CDMA modulation modules, DAC digital-to-analogues converter, LED drive circuit and 4 × 4RGB-LED arrays according to
Secondary connection；4 × 4RGB-LED arrays connect infrared filter by transmission subsystem；The infrared filter, CMOS figures
As sensor, ADC analog-digital converters and CDMA demodulation modules and CSK decoder modules are sequentially connected；
Described LED drive circuit is current signal transfer to 4 × 4RGB-LED array phases；Described transmission subsystem will pass through
The visible light signal that CSK modulation modules and CDMA modulation modules carry out dual modulation passes to cmos image sensor；Described
Embedded system is by programming, and to initial data progress CDMA and CSK dual modulation, the initial data by dual modulation is first
Analog signal is turned into by DAC digital analog converters, then current signal is converted into by LED drive circuit, the current signal drives
Dynamic 4 × 4RGB-LED arrays are led to sending visible light signal between described cmos image sensor and 4 × 4RGB-LED arrays
Cross visible light signal to be coupled, described cmos image sensor will be seen that optical signal is converted into electric signal, the electric signal
Data signal is changed into by ADC analog-digital converters, the data signal is carried out using CDMA demodulation modules and CSK decoder modules
Signal demodulates, to obtain final reception signal.
2. the optical communication system according to claim 1 based on CDMA Yu CSK dual modulations, it is characterised in that described
Embedded system will be transferred to the data progress CSK and CDMA of different user dual modulation, to obtain spread-spectrum signal；It is described
Spread-spectrum signal analog signal is become by DAC digital analog converters, analog signal driving 4 × 4RGB-LED arrays are sent can
See optical signal.
3. the optical communication system according to claim 1 based on CDMA Yu CSK dual modulations, it is characterised in that the biography
The visible light signal that defeated subsystem is transmitted, is transferred to cmos image sensor again after being filtered by infrared filter.
4. the optical communication system according to claim 1 based on CDMA Yu CSK dual modulations, it is characterised in that the biography
Defeated subsystem is free space, has environmental disturbances light in the free space.
5. the optical communication system according to claim 1 based on CDMA Yu CSK dual modulations, it is characterised in that CMOS schemes
As sensor is when will be seen that optical signal is converted into analog electrical signal, the 256 rank color depths of tri- components of RGB using certain spacing as
Indexing is judged.
6. the optical communication system according to claim 5 based on CDMA Yu CSK dual modulations, it is characterised in that work as reception
When a certain component color depth of visible light signal that subsystem receives is between 50-70,60 are taken to be used as reception value.
7. the optical communication system according to claim 1 based on CDMA Yu CSK dual modulations, it is characterised in that its feature
It is, the specific modulation system of the CDMA modulation modules is：In each intelligent terminal, spread-spectrum signal removes added during modulation
Offset, then the orthogonal intersection with each being held carry out inner product operation, acquired results again divided by spreading code length, then
Obtain the color depth of required tri- kinds of colors of RGB by CSK modulation.
8. the optical communication system according to claim 1 based on CDMA Yu CSK dual modulations, it is characterised in that its feature
It is, the specific modulation system of the CSK modulation modules is：The coding that the value of the color depth of tri- kinds of colors of RGB is modulated according to CSK
Mode is decoded, that is, obtains the binary data finally transmitted to the user.
9. a kind of modulator approach based on CDMA Yu the optical communication system of CSK dual modulations applied to described in claim 1, its
It is characterised by, comprises the following steps：
Step 1, in embedded systems, every two bit binary data to different user is transmitted by certain coded system, point
The data signal P for representing tri- kinds of color color depths of RGB is not converted intoR、PGAnd PB；
Step 2, the data signal P to gainedR、PGAnd PBOrthogonal intersection is respectively adopted to be spread, then belonging to for gained is same
A kind of spread-spectrum signal of different user of color is added, and adds an appropriate offset for the spread-spectrum signal after being added, and is made
The value of each of the spread-spectrum signal always exported is obtained between 0-255.
10. modulator approach according to claim 9, it is characterised in that in step 1, RGB is represented using the data of 8
The color depth of three kinds of colors, the color depth of each color have 28Individual grade, i.e.,：256 rank color depths.
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| CN108134630A (en) * | 2017-12-27 | 2018-06-08 | 南京邮电大学 | A kind of multi-user's MAC channel access methods based on hopping pattern |
| CN108521298A (en) * | 2018-05-05 | 2018-09-11 | 华南理工大学 | A kind of integrated VLC method and system of holding high office based on image segmentation |
| CN110649966A (en) * | 2019-08-22 | 2020-01-03 | 杭州电子科技大学 | Method for realizing near-distance optical communication based on visible light and mobile phone camera imaging characteristics |
| CN113395113A (en) * | 2021-06-11 | 2021-09-14 | 桂林电子科技大学 | Differential demodulation method based on color shift keying |
| CN114624746A (en) * | 2022-03-07 | 2022-06-14 | 天津凯芯科技有限公司 | CSK modulation symbol decoding method, device, chip and satellite receiver |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039912A (en) * | 2017-12-12 | 2018-05-15 | 中山大学 | A kind of multilayer gamut key modulation method of achievable non-orthogonal multiple access |
| CN108039912B (en) * | 2017-12-12 | 2020-04-21 | 中山大学 | Multilayer color shift keying modulation method capable of realizing non-orthogonal multiple access |
| CN108134630A (en) * | 2017-12-27 | 2018-06-08 | 南京邮电大学 | A kind of multi-user's MAC channel access methods based on hopping pattern |
| CN108521298A (en) * | 2018-05-05 | 2018-09-11 | 华南理工大学 | A kind of integrated VLC method and system of holding high office based on image segmentation |
| CN110649966A (en) * | 2019-08-22 | 2020-01-03 | 杭州电子科技大学 | Method for realizing near-distance optical communication based on visible light and mobile phone camera imaging characteristics |
| CN113395113A (en) * | 2021-06-11 | 2021-09-14 | 桂林电子科技大学 | Differential demodulation method based on color shift keying |
| CN113395113B (en) * | 2021-06-11 | 2022-07-26 | 桂林电子科技大学 | Differential demodulation method based on color shift keying |
| CN114624746A (en) * | 2022-03-07 | 2022-06-14 | 天津凯芯科技有限公司 | CSK modulation symbol decoding method, device, chip and satellite receiver |
| CN114624746B (en) * | 2022-03-07 | 2023-01-17 | 北京凯芯微科技有限公司 | CSK modulation symbol decoding method, device, chip and satellite receiver |
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