CN108512599A - Visible light communication device and method - Google Patents

Visible light communication device and method Download PDF

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Publication number
CN108512599A
CN108512599A CN201810184463.6A CN201810184463A CN108512599A CN 108512599 A CN108512599 A CN 108512599A CN 201810184463 A CN201810184463 A CN 201810184463A CN 108512599 A CN108512599 A CN 108512599A
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CN
China
Prior art keywords
visible light
time block
light source
block codes
orthogonal space
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CN201810184463.6A
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Chinese (zh)
Inventor
鲍晶晶
卞建勇
麦强
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Dongguan Polytechnic
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Dongguan Polytechnic
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Priority to CN201810184463.6A priority Critical patent/CN108512599A/en
Publication of CN108512599A publication Critical patent/CN108512599A/en
Pending legal-status Critical Current

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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
    • 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
    • H04B10/516—Details of coding or modulation
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0625—Transmitter arrangements
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0668—Orthogonal systems, e.g. using Alamouti codes

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a kind of visible light communication device and methods, wherein visible light communication device includes transmitting terminal, transmitting terminal includes modulator, orthogonal space-time block codes device and the N number of transmitting light source that can send out visible light, N number of transmitting light source is connected in parallel, and orthogonal space-time block codes device is for encoding the information data Jing Guo modulators modulate using orthogonal space-time block codes criterion；N number of transmitting light source is electrically connected with orthogonal space-time block codes device, for sending N number of information code that orthogonal space-time block codes device exports by optical channel in each transmit cycle；Information-data packet is mapped to spatial domain and time-domain by the visible light communication device with above structure in transmitting terminal using orthogonal space-time block codes device, generate orthogonal code sequence, then emit the information data after coding simultaneously by N number of transmitting light source, to make message transmission rate improve N times in the case where losing a small amount of signal-to-noise ratio, while the error performance in communication process is effectively ensured.

Description

Visible light communication device and method
Technical field
The present invention relates to technical field of visible light communication more particularly to a kind of visible light based on orthogonal space time packet are logical T unit and method.
Background technology
Visible light communication has that broadband high-speed, frequency spectrum are abundant, high confidentiality, electromagnetic-radiation-free, density are high, at low cost etc. excellent Point is a kind of emerging wireless access technology to be grown up based on LED technology, following by having as traditional wireless communication technology Effect supplement.With the arrival of the Internet of things era, demand of the people to message capacity constantly increases, it is seen that the high-speed transfer of optic communication Problem increasingly attracts attention.
Currently, mainly have using the method that modulation coding techniques improve visible light communication transmission rate：One, it is based on RGB The multichannel wave division multiplex mode of LED；Two, dual modulation mode, modulation system such as based on QAM and MPPM are based on ASK and FSK Modulation system etc..Based on the multichannel wave division multiplex mode of RGB LED in practical application by receiving terminal device volume and cost Limitation, only a kind of optical signal of color is modulated mostly, the light of other colors only supplemented by midwifery life white light make normal shine Bright use, therefore fail to make full use of the polychrome resource of RGB LED.Dual modulation mode is mostly the light intensity of modulated signal and break-make Combine, realizes the raising of visible light communication transmission rate, but it tends not to the error performance of guarantee system.
Based on the above issues, with the continuous development of MIMO technology, the more of wireless communication system are realized by more antennas Hair to be received, and is made full use of space resources, can be effectively improved the channel capacity and reliability of system, and existing illumination LED is mostly by more A lamp bead composition, so visible light communication system is natural multiple entry system, still, the scarce order of channel makes MIMO technology Application be extremely restricted.
Invention content
The object of the present invention is to provide a kind of visible light communication devices, are passed in the data for effectively promoting visible light communication system While defeated rate, moreover it is possible to ensure system error performance.
It is a further object of the present invention to provide a kind of visible light communication methods, in the number for effectively promoting visible light communication system While according to transmission rate, moreover it is possible to ensure system error performance.
To achieve the goals above, the invention discloses a kind of visible light communication device, including transmitting terminal, the transmitting terminals Including modulator, orthogonal space-time block codes device and the N number of transmitting light source that can send out visible light, N number of transmitting light source is connected in parallel, The orthogonal space-time block codes device is used to carry out the information data Jing Guo the modulators modulate using orthogonal space-time block codes criterion Coding；N number of transmitting light source is electrically connected with the orthogonal space-time block codes device, and being used in each transmit cycle will be described N number of information code of orthogonal space-time block codes device output is sent by optical channel, wherein N>=2, N are even number.
Compared with prior art, visible light communication device of the present invention uses orthogonal space-time block codes device Information Number in transmitting terminal It is mapped to spatial domain and time-domain according to grouping, generates orthogonal code sequence, it is then same by N number of transmitting light source for sending out visible light When transmitting coding after information data, to making message transmission rate improve N times in the case where losing a small amount of signal-to-noise ratio, together When error performance in communication process has been effectively ensured.
Preferably, the orthogonal space-time block codes device using orthogonal matrix X to N number of tune for being taken out from the modulator every time Symbol processed is encoded, the matrixWherein, ()*Representing matrix is total Yoke.
Preferably, the transmitting terminal further includes D/A converter module and light source driver module, the D/A converter module with The output end of the orthogonal space-time block codes device is electrically connected, and the Digital message code that the orthogonal space-time block codes device exports is converted into Analog information code, the output end of the D/A converter module are electrically connected with the light source driver module；The light source drives mould Block is for driving N number of transmitting light source luminescent and emitting information code.
Preferably, the visible light communication device further includes the receiving terminal to match with the transmitting terminal, the receiving terminal Including optical signal detector, analog-to-digital conversion module, decoder and demodulator；The optical signal detector was used in each signal week Interim detection simultaneously receives the N number of information code launched from N number of transmitting light source；The analog-to-digital conversion module is used for the light The analog information code of signal detector detection is converted into Digital message code and is used for the decoder；The input terminal of the decoder It is electrically connected with the output end of the analog-to-digital conversion module, the information code for being detected to the optical signal detector is translated Code operation；The input terminal of the demodulator and the output end of the decoder are electrically connected.
Preferably, the decoder uses maximum-likelihood decoding criterion into row decoding.
Preferably, the transmitting light source is LED lamp bead.
The invention also discloses a kind of visible light communication method, including launching technique, the launching technique includes：
1) information data to be emitted is modulated by, modulation step by modulator；
2), coding step is performed the encoding operation using orthogonal space-time block codes device, and each encoding operation is from the modulator N number of modulation symbol is taken, is then encoded according to the encoding scheme in the orthogonal space-time block codes device, wherein N>=2, N are even Number；
3) information code belonging to N number of modulation symbol after encoding operation is respectively mapped to N by, step of transmitting It is a be connected in parallel send out on the transmitting light source of visible light, the information code encoded is passed through into light by N number of transmitting light source Channel emission is gone out.
Preferably, the orthogonal space-time block codes device using orthogonal matrix X to N number of tune for being taken out every time from the modulator Symbol processed performs the encoding operation, the matrixWherein, ()*Indicate square Battle array conjugation.
Preferably, the information code of N number of modulation symbol of the orthogonal space-time block codes device output is in continuous N number of symbol week Emit simultaneously from N number of transmitting light source respectively in phase.
Preferably, the visible light communication method further includes method of reseptance, the method for reseptance includes：
1), signal detection step, the information code sent out to N number of transmitting light source using optical signal detector are detected And reception；
2), decoding procedure, the information code received to the signal detector according to orthogonal space-time block codes rule are translated Code operation；
3), demodulation step carries out data recovery according to the modulating rule of the modulator to the information code by decoding.
Preferably, in decoding procedure, using maximum-likelihood decoding criterion into row decoding operation.
Description of the drawings
Fig. 1 is the system block diagram of visible light communication device transmitting terminal of the embodiment of the present invention.
Fig. 2 is the specific implementation structural schematic diagram of visible light communication device transmitting terminal of the present invention.
Fig. 3 is the specific implementation structural schematic diagram of visible light communication device receiving terminal of the present invention.
Specific implementation mode
For technology contents, structure feature, realization principle and the objects and the effects that the present invention will be described in detail, tie below It closes embodiment and attached drawing is explained in detail.
The invention discloses a kind of visible light communication devices for embodiment 1, as shown in Figure 1, including transmitting terminal, transmitting terminal includes Modulator 10, orthogonal space-time block codes device 11 and the N number of transmitting light source 12 that can send out visible light, N number of transmitting light source 12 are connected in parallel, Orthogonal space-time block codes device 11 is used to encode the information data modulated by modulator 10 using orthogonal space-time block codes criterion, N number of transmitting light source 12 is electrically connected with orthogonal space-time block codes device 11, is used for orthogonal space-time block codes in each transmit cycle N number of information code that device 11 exports is sent by optical channel 16, wherein N>=2, N are even number.
Visible light communication device of the present invention is mapped to information-data packet using orthogonal space-time block codes device 11 in transmitting terminal Spatial domain and time-domain, generate orthogonal code sequence, then by N number of transmitting light source 12 for sending out visible light while emitting coding Information data afterwards is effectively ensured simultaneously to make message transmission rate improve N times in the case where losing a small amount of signal-to-noise ratio Error performance in communication process.Preferably, orthogonal space-time block codes device 11 using orthogonal matrix X to every time from modulator 10 The N number of modulation symbol taken out is encoded, matrixWherein, ()*Table Show that Matrix Conjugate, transmitting light source 12 are LED lamp bead.
The present invention will be described in detail so that the transmitting light source 12 of transmitting terminal is LED light of the band there are two LED lamp bead as an example below can The emission process of light-exposed communication device.It please refers to Fig.1 and Fig. 2, modulator 10 uses in the modulation systems such as OOK, ASK, PAM, QAM It is any, under the control of transmitting terminal digital signal processor 15, in orthogonal space-time block codes device 11, each encoding operation from Two modulation symbol x are taken in modulator 101, x2, the encoder matrix X then provided according to the following formula encodes them, then leads to Cross two lamp bead LED that the information code after coding is respectively mapped to LED light by D/A converter module 13 and light source driver module 14 In lamp bead 1 and LED lamp bead 2.
The coded identification that orthogonal space-time block codes device 11 exports is within two continuous symbol periods from LED lamp bead 1 and LED lamp bead 2 launch.As shown in table 1 below, in first symbol period, symbol x1And x2Divide simultaneously from LED lamp bead 1 and LED lamp bead 2 Do not emit, in second symbol period, symbolWithEmit respectively from LED lamp bead 1 and LED lamp bead 2 simultaneously.The coding Scheme was not only encoded in spatial domain but also in time-domain.X is used respectively1And x2Indicate the transmitting sequence in LED lamp bead 1 and LED lamp bead 2 Row,
Table 1
The transmitting sequence for being mainly characterized by LED lamp bead 1 and LED lamp bead 2 of orthogonal space time packet is orthogonal, i.e. sequence x1And x2Inner product be 0,
Visible light communication device of the present invention further includes a receiving terminal to match with above-mentioned transmitting terminal, as shown in figure 3, receiving End includes optical signal detector 20, analog-to-digital conversion module 21, decoder 22 and demodulator 23.Optical signal detector 20 is used for every It is detected in a signal period and receives the N number of information code launched from N number of transmitting light source 12, analog-to-digital conversion module 21 is used for light Signal detector 20 detect analog information code be converted into Digital message code for decoder 22 use, the input terminal of decoder 22 with The output end of analog-to-digital conversion module 21 is electrically connected, and the information code for being detected to optical signal detector 20 is made into row decoding Industry, the input terminal of demodulator 23 are electrically connected with the output end of decoder 22.
The detailed process that above-mentioned receiving terminal receives signal is：The information of the detection transmitting terminal transmitting in real time of optical signal detector 20 The information data received is carried out analog-to-digital conversion, decoding by data successively under the control of receiving terminal digital signal processor 24 And demodulation.H is used respectively from the channel fading coefficient of LED lamp bead 1 and LED lamp bead 2 to optical signal detector 20 in t moment1(t) And h2(t) it indicates, and assumes h1(t) and h2(t) constant in two continuous symbol transmit cycles, then receiving terminal is in t and t+T The reception optical signal at quarter is expressed as
r1=h1x1+h2x2+n1
Wherein, n1And n2It is additive white Gaussian noise.
For receiving terminal using maximum-likelihood decoding criterion into row decoding, decoding complexity is low.
The invention also discloses a kind of visible light communication method, including launching technique and method of reseptance, such as Fig. 1 for embodiment 2 Shown, launching technique includes：
1) information data to be emitted is modulated by, modulation step by modulator 10；
2), coding step is performed the encoding operation using orthogonal space-time block codes device 11, and each encoding operation is from modulator 10 N number of modulation symbol is taken, is then encoded according to the encoding scheme in orthogonal space-time block codes device 11, wherein N>=2, N are even Number；
3), step of transmitting, by the information code belonging to N number of modulation symbol after encoding operation be respectively mapped to it is N number of simultaneously Sending out on the transmitting light source 12 of visible light for connection connection, passes through optical channel by N number of transmitting light source 12 by the information code encoded Launch.
Preferably, orthogonal space-time block codes device 11 uses the orthogonal matrix X such as embodiment 1 to being taken out every time from modulator 10 N number of modulation symbol perform the encoding operation.
As shown in figure 3, method of reseptance includes：
1), signal detection step, the information code sent out to N number of transmitting light source 12 using optical signal detector 20 are detected And reception；
2), decoding procedure, the information code received to optical signal detector 20 according to orthogonal space-time block codes rule are translated Code operation；
3), demodulation step carries out data recovery according to the modulating rule of modulator 10 to the information code by decoding.
The known mistake of specific work process and 1 visible light communication device of embodiment about visible light communication method of the present invention Cheng Xiangtong, details are not described herein.
To sum up, visible light communication device of the present invention designs the coding and interpretation method of more LED lamp bead parallel transmissions, is ensureing Effectively improve the message transmission rate of visible light communication system on the basis of system error performance, at the same transmitting terminal pass through it is existing The light carrying information that each lamp bead is sent out in illumination LED had not only taken full advantage of visible light resource but also will not excessively change existing illumination The structure of LED.
Above disclosed is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly It encloses, therefore according to equivalent variations made by scope of the present invention patent, still falls within the range that the present invention is covered.

Claims (11)

1. a kind of visible light communication device, including transmitting terminal, which is characterized in that when the transmitting terminal includes modulator, orthogonal space Encoder and the N number of transmitting light source that can send out visible light, N number of transmitting light source are connected in parallel, the orthogonal space-time block codes device For being encoded to the information data Jing Guo the modulators modulate using orthogonal space-time block codes criterion；N number of transmitting light Source is electrically connected with the orthogonal space-time block codes device, for exporting the orthogonal space-time block codes device in each transmit cycle N number of information code sent by optical channel, wherein N>=2, N are even number.
2. visible light communication device according to claim 1, which is characterized in that the orthogonal space-time block codes device is using orthogonal Matrix X encodes the N number of modulation symbol taken out from the modulator every time, the matrix
Wherein, ()*Representing matrix is conjugated.
3. visible light communication device according to claim 1, which is characterized in that the transmitting terminal further includes digital-to-analogue conversion mould Block and light source driver module, the D/A converter module and the output end of the orthogonal space-time block codes device are electrically connected, will be described The Digital message code of orthogonal space-time block codes device output is converted into analog information code, the output end of the D/A converter module with it is described Light source driver module is electrically connected；The light source driver module is for driving N number of transmitting light source luminescent and emitting information code.
4. visible light communication device according to claim 2, which is characterized in that further include matching with the transmitting terminal Receiving terminal, the receiving terminal include optical signal detector, analog-to-digital conversion module, decoder and demodulator；The optical signal detecting Device is used to detect and receive in each signal period the N number of information code launched from N number of transmitting light source；The modulus turns Mold changing block is used for the analog information code that the optical signal detector detects to be converted into Digital message code for the decoder； The input terminal of the decoder and the output end of the analog-to-digital conversion module are electrically connected, for being examined to the optical signal detector The information code measured is into row decoding operation；The input terminal of the demodulator and the output end of the decoder are electrically connected.
5. visible light communication device according to claim 2, which is characterized in that the decoder uses maximum-likelihood decoding Criterion is into row decoding.
6. visible light communication device according to claim 1, which is characterized in that the transmitting light source is LED lamp bead.
7. a kind of visible light communication method, which is characterized in that including launching technique, the launching technique includes：
1) information data to be emitted is modulated by, modulation step by modulator；
2), coding step is performed the encoding operation using orthogonal space-time block codes device, and each encoding operation takes N from the modulator Then a modulation symbol is encoded, wherein N according to the encoding scheme in the orthogonal space-time block codes device>=2, N are even number；
3), step of transmitting, by the information code belonging to N number of modulation symbol after encoding operation be respectively mapped to it is N number of simultaneously Sending out on the transmitting light source of visible light for connection connection, passes through optical channel by N number of transmitting light source by the information code encoded Launch.
8. visible light communication method according to claim 7, which is characterized in that the orthogonal space-time block codes device is using orthogonal Matrix X performs the encoding operation the N number of modulation symbol taken out every time from the modulator, the matrix
Wherein, ()*Representing matrix is conjugated.
9. visible light communication method according to claim 8, which is characterized in that the institute of the orthogonal space-time block codes device output The information code of N number of modulation symbol is stated in continuous N number of symbol period respectively from N number of transmitting light source while to emit.
10. visible light communication method according to claim 8, which is characterized in that further include method of reseptance, the recipient Method includes：
1), signal detection step, the information code sent out to N number of transmitting light source using optical signal detector are detected and are connect It receives；
2), decoding procedure makees the information code that the signal detector receives into row decoding according to orthogonal space-time block codes rule Industry；
3), demodulation step carries out data recovery according to the modulating rule of the modulator to the information code by decoding.
11. visible light communication method according to claim 10, which is characterized in that in decoding procedure, seemingly using maximum Right coding guideline is into row decoding operation.
CN201810184463.6A 2018-03-06 2018-03-06 Visible light communication device and method Pending CN108512599A (en)

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