CN105812055B - The method and system of the half-duplex time-division two-way visible light communication of RGB LED modules - Google Patents

The method and system of the half-duplex time-division two-way visible light communication of RGB LED modules Download PDF

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CN105812055B
CN105812055B CN201610200828.0A CN201610200828A CN105812055B CN 105812055 B CN105812055 B CN 105812055B CN 201610200828 A CN201610200828 A CN 201610200828A CN 105812055 B CN105812055 B CN 105812055B
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rgb led
data
bias voltage
splitter
module
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CN105812055A (en
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李上宾
徐正元
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University of Science and Technology of China USTC
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University of Science and Technology of China USTC
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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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission

Abstract

The invention discloses a kind of method and system of the two-way visible light communication of half-duplex time-division RGB LED module, RGB LED operations are in a half-duplex mode, light source can be used as to send data, can also be used as photodetector to receive data, save the cost of extra photodetector；Compared with infrared light or Wifi offer uplink services are utilized in existing visible light communication, the present invention is carried out data transmission without extra transmission medium, uplink and downlink using visible ray, effectively reduces the complexity of system realization.

Description

The method and system of the half-duplex time-division two-way visible light communication of RGB LED modules
Technical field
The present invention relates to visible light communication field, more particularly to a kind of two-way visible ray of half-duplex time-division RGB LED module The method and system of communication.
Background technology
Visible light communication technology is that strength signal is modulated on visible LED by one kind, is carried out using photoelectric detection equipment The communication technology of detection.LED is because of its higher light efficiency, low-power consumption, longer service life, green energy conservation, it is more likely that becomes New lighting source.The illumination advantage of LED has on the one hand been played with reference to the visible light communication technology of LED, while by communication function It is combined with lighting engineering, has attracted extensive concern and the research of scientific circles.As what visible light communication technology was studied gos deep into With progressively maturation, it is seen that optical communication technique has also progressively attracted the attention of industrial quarters.
At present, how the research to visible light communication improves in the transmission rate of communication system if being mostly focused on, limitation It is, LED therein is mostly as transmission light source, there is provided the data transport service of uni-directional downlink.Actual communication system, Downlink is not only needed, while the data transport service of uplink must also be provided.Existing relevant research, utilizes infrared light Or Wifi, there is provided the data transport service of uplink, as one kind auxiliary of visible light communication technology, in fact, this more The communication system implementation complexity of mould is undoubtedly very high.In addition, though there are literature research R/G/B LED while be used as signal Send and signal receiver part.But the R/G/B LED modules with different colors in these documents all independently drives, and independently drives The interference of optical signal can be produced between LED modules with different colors, reduces the Signal to Interference plus Noise Ratio of visible light communication system.
The content of the invention
The object of the present invention is to provide a kind of two-way visible light communication of half-duplex time-division RGB LED module method and be System, has the advantages that low complex degree and low cost.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of method of the two-way visible light communication of half-duplex time-division RGB LED module, including：
Two isometric isochronous surfaces are divided the time into using time-multiplexed mode, one of isochronous surface carries out The data transfer of line link, another isochronous surface carry out the data transfer of downlink；
In the data transfer of downlink, by increasing certain forward bias voltage on the first RGB LED, So that light source characteristic is presented in the first RGB LED, and modulated signal is loaded via the first splitter again by the first drive module Onto the first RGB LED, the transmission of data is completed；By increasing certain reverse bias voltage on the 2nd RGB LED, So that photodetector characteristic is presented in the 2nd RGB LED, the first RGB LED data-signals sent are detected, then via Second splitter is completed the reception of data-signal by the second receiving module；
In the data transfer of uplink, by increasing certain forward bias voltage on the 2nd RGB LED, So that light source characteristic is presented in the 2nd RGB LED, and modulated signal is loaded via the second splitter again by the second drive module Onto the 2nd RGB LED, the transmission of data is completed；By increasing certain reverse bias voltage on the first RGB LED, So that photodetector characteristic is presented in the first RGB LED, the 2nd RGB LED data-signals sent are detected, then via First splitter is completed the reception of data-signal by the first receiving module.
Further, first and second RGB LED is formed by three color RGB LED being connected in series.
Further, first and second splitter includes a switch chip, and comprising tri- ports of A, B, C, wherein, port A is connected with switch chip, and port B and C are connected by the rise of switch chip with full state with port A.
Further, it is more than 90 that RGB LED, which send colour developing, when forward bias voltage drives, colour temperature 3000K-5000K White light.
Further, the photoelectric conversion efficiency of RGB LED is more than 0.4A/W when reverse bias voltage drives.
A kind of system of the two-way visible light communication of half-duplex time-division RGB LED module, including：
The first RGB LED being made of the first splitter, the first RGB LED, the first receiving module and the first drive module Module, and the 2nd RGB LED being made of the second splitter, the 2nd RGB LED, the second receiving module and the second drive module Module；
Two isometric isochronous surfaces are divided the time into using time-multiplexed mode, one of isochronous surface carries out The data transfer of line link, another isochronous surface carry out the data transfer of downlink；
In the data transfer of downlink, the first RGB LED modules are as data sending terminal, the 2nd RGB LED modules As data receiver；By increasing certain forward bias voltage on the first RGB LED so that the first RGB LED Light source characteristic is presented, and modulated signal is loaded on the first RGB LED via the first splitter again by the first drive module, Complete the transmission of data；By increasing certain reverse bias voltage on the 2nd RGB LED so that the 2nd RGB LED Photodetector characteristic is presented, the first RGB LED data-signals sent are detected, then via the second splitter by second Receiving module completes the reception of data-signal；
In the data transfer of uplink, the 2nd RGB LED modules are as data sending terminal, the first RGB LED modules As data receiver；By increasing certain forward bias voltage on the 2nd RGB LED so that the 2nd RGB LED Light source characteristic is presented, and modulated signal is loaded on the 2nd RGB LED via the second splitter again by the second drive module, Complete the transmission of data；By increasing certain reverse bias voltage on the first RGB LED so that the first RGB LED Photodetector characteristic is presented, the 2nd RGB LED data-signals sent are detected, then via the first splitter by first Receiving module completes the reception of data-signal.
Further, first and second RGB LED is formed by three color RGB LED being connected in series.
Further, first and second splitter includes a switch chip, and comprising tri- ports of A, B, C, wherein, port A is connected with switch chip, and port B and C are connected by the rise of switch chip with full state with port A.
Further, it is more than 90 that RGB LED, which send colour developing, when forward bias voltage drives, colour temperature 3000K-5000K White light.
Further, the photoelectric conversion efficiency of RGB LED is more than 0.4A/W when reverse bias voltage drives.
As seen from the above technical solution provided by the invention, RGB LED operations in a half-duplex mode, can conduct Light source sends data, can also be used as photodetector to receive data, save the cost of extra photodetector；With it is existing can See that providing uplink service using infrared light or Wifi in optic communication compares, the present invention is without extra transmission medium, uplink Link and downlink are all carried out data transmission using visible ray, effectively reduce the complexity of system realization.In addition, this programme The LED of middle R/G/B LED different colours is one another in series together, and this structure can improve R/G/B LED while as wireless Optical signal is sent and the antijamming capability of the visible light communication system of wireless optical signal receiving terminal.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this For the those of ordinary skill in field, without creative efforts, other can also be obtained according to these attached drawings Attached drawing.
Fig. 1 is a kind of principle of the two-way visible light communication of half-duplex time-division RGB LED module provided in an embodiment of the present invention Schematic diagram；
Fig. 2 is splitter schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the signal of data receiver provided in an embodiment of the present invention and data sending terminal time synchronization establishment stage Figure；
Fig. 4 is the schematic diagram of bi-directional link establishment stage provided in an embodiment of the present invention.
Embodiment
With reference to the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on this The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained without making creative work Example, belongs to protection scope of the present invention.
The method that the embodiment of the present invention provides a kind of two-way visible light communication of half-duplex time-division RGB LED module, it includes：
Two isometric isochronous surfaces are divided the time into using time-multiplexed mode, one of isochronous surface carries out The data transfer of line link, another isochronous surface carry out the data transfer of downlink；
As shown in Figure 1, in the data transfer of downlink, by increasing necessarily just on the first RGB LED To bias voltage so that the first RGB LED present light source characteristic, and by modulated signal by the first drive module again via first Splitter is loaded on the first RGB LED, completes the transmission of data；It is certain anti-by increasing on the 2nd RGB LED To bias voltage so that photodetector characteristic is presented in the 2nd RGB LED, and the data-signal that the first RGB LED are sent is carried out Detection, then the reception via the second splitter by the second receiving module completion data-signal；
In the data transfer of uplink, by increasing certain forward bias voltage on the 2nd RGB LED, So that light source characteristic is presented in the 2nd RGB LED, and modulated signal is loaded via the second splitter again by the second drive module Onto the 2nd RGB LED, the transmission of data is completed；By increasing certain reverse bias voltage on the first RGB LED, So that photodetector characteristic is presented in the first RGB LED, the 2nd RGB LED data-signals sent are detected, then via First splitter is completed the reception of data-signal by the first receiving module.
In the embodiment of the present invention, first and second RGB LED is formed by three color RGB LED being connected in series；This knot Structure can improve R/G/B LED while be sent and the visible light communication system of wireless optical signal receiving terminal as wireless optical signal Antijamming capability.
As shown in Fig. 2, first and second splitter includes a switch chip, and comprising tri- ports of A, B, C, wherein, end Mouthful A is connected with switch chip, and port B and C are connected by the rise of switch chip with full state with port A.
It is more than 90 that RGB LED, which send colour developing, in the embodiment of the present invention, when forward bias voltage drives, colour temperature 3000K- The white light of 5000K；The photoelectric conversion efficiency of RGB LED is more than 0.4A/W when reverse bias voltage drives.
Preferably, before carrying out data transmission, it is also necessary to the time synchronization of data receiver and data sending terminal is carried out, Its process is as shown in Figure 3.And then establish bi-directional link as shown in Figure 4 and carry out data transmission.
On the other hand, the embodiment of the present invention also provides and a kind of corresponding half-duplex time-division RGB LED moulds of preceding method The system of the two-way visible light communication of group, it includes：
Using time-multiplexed mode by the first splitter, the first RGB LED, the first receiving module and the first drive module First RGB LED modules of composition, and by the second splitter, the 2nd RGB LED, the second receiving module and the second drive module 2nd RGB LED modules of composition；
Two isometric isochronous surfaces are divided the time into, one of isochronous surface carries out the data transfer of uplink, Another isochronous surface carries out the data transfer of downlink；
See also Fig. 1, in the data transfer of downlink, the first RGB LED modules are as data sending terminal, and second RGB LED modules are as data receiver；By increasing certain forward bias voltage on the first RGB LED so that Light source characteristic is presented in first RGB LED, and modulated signal is loaded into the via the first splitter again by the first drive module On one RGB LED, the transmission of data is completed；By increasing certain reverse bias voltage on the 2nd RGB LED so that Photodetector characteristic is presented in 2nd RGB LED, and the first RGB LED data-signals sent are detected, then via second Splitter is completed the reception of data-signal by the second receiving module；
In the data transfer of uplink, the 2nd RGB LED modules are as data sending terminal, the first RGB LED modules As data receiver；By increasing certain forward bias voltage on the 2nd RGB LED so that the 2nd RGB LED Light source characteristic is presented, and modulated signal is loaded on the 2nd RGB LED via the second splitter again by the second drive module, Complete the transmission of data；By increasing certain reverse bias voltage on the first RGB LED so that the first RGB LED Photodetector characteristic is presented, the 2nd RGB LED data-signals sent are detected, then via the first splitter by first Receiving module completes the reception of data-signal.
In the embodiment of the present invention, first and second RGB LED is formed by three color RGB LED being connected in series.
See also Fig. 2, first and second splitter includes a switch chip, and comprising tri- ports of A, B, C, wherein, Port A is connected with switch chip, and port B and C are connected by the rise of switch chip with full state with port A.
It is more than 90 that RGB LED, which send colour developing, in the embodiment of the present invention, when forward bias voltage drives, colour temperature 3000K- The white light of 5000K；The photoelectric conversion efficiency of RGB LED is more than 0.4A/W when reverse bias voltage drives.
Preferably, before carrying out data transmission, it is also necessary to the time synchronization of data receiver and data sending terminal is carried out, Its process is referring to Fig. 3.And then establish bi-directional link as shown in Figure 4 and carry out data transmission.
In addition, it will be understood by those skilled in the art that the embodiment of the present invention occur first, second be only used for distinguish phase Same device.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can readily occur in, It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims Subject to enclosing.

Claims (8)

  1. A kind of 1. method of the two-way visible light communication of half-duplex time-division RGB LED module, it is characterised in that including：
    Two isometric isochronous surfaces are divided the time into using time-multiplexed mode, one of isochronous surface carries out uplink The data transfer on road, another isochronous surface carry out the data transfer of downlink；
    In the data transfer of downlink, by increasing certain forward bias voltage on the first RGB LED so that Light source characteristic is presented in first RGB LED, and modulated signal is loaded into the via the first splitter again by the first drive module On one RGB LED, the transmission of data is completed；By increasing certain reverse bias voltage on the 2nd RGB LED so that Photodetector characteristic is presented in 2nd RGB LED, and the first RGB LED data-signals sent are detected, then via second Splitter is completed the reception of data-signal by the second receiving module；
    In the data transfer of uplink, by increasing certain forward bias voltage on the 2nd RGB LED so that Light source characteristic is presented in 2nd RGB LED, and modulated signal is loaded into the via the second splitter again by the second drive module On two RGB LED, the transmission of data is completed；By increasing certain reverse bias voltage on the first RGB LED so that Photodetector characteristic is presented in first RGB LED, and the 2nd RGB LED data-signals sent are detected, then via first Splitter is completed the reception of data-signal by the first receiving module；
    Wherein, first and second RGB LED is formed by three color RGB LED being connected in series.
  2. 2. according to the method described in claim 1, it is characterized in that, first and second splitter includes a switch chip, and bag Containing tri- ports of A, B, C, wherein, port A is connected with switch chip, port B and rises and full state of the C by switch chip To connect with port A.
  3. 3. according to the method described in claim 1, it is characterized in that, RGB LED send colour developing and are when forward bias voltage drives More than 90, colour temperature is the white light of 3000K-5000K.
  4. 4. according to the method described in claim 1, it is characterized in that, when reverse bias voltage drives RGB LED opto-electronic conversion Efficiency is more than 0.4A/W.
  5. A kind of 5. system of the two-way visible light communication of half-duplex time-division RGB LED module, it is characterised in that including：
    The first RGB LED modules being made of the first splitter, the first RGB LED, the first receiving module and the first drive module, And the 2nd RGB LED modules being made of the second splitter, the 2nd RGB LED, the second receiving module and the second drive module；
    Two isometric isochronous surfaces are divided the time into using time-multiplexed mode, one of isochronous surface carries out uplink The data transfer on road, another isochronous surface carry out the data transfer of downlink；
    In the data transfer of downlink, the first RGB LED modules are as data sending terminal, the 2nd RGB LED module conducts Data receiver；By increasing certain forward bias voltage on the first RGB LED so that the first RGB LED are presented Light source characteristic, and modulated signal is loaded on the first RGB LED via the first splitter again by the first drive module, complete The transmission of data；By increasing certain reverse bias voltage on the 2nd RGB LED so that the 2nd RGB LED are presented Photodetector characteristic, is detected the first RGB LED data-signals sent, then is received via the second splitter by second Module completes the reception of data-signal；
    In the data transfer of uplink, the 2nd RGB LED modules are as data sending terminal, the first RGB LED module conducts Data receiver；By increasing certain forward bias voltage on the 2nd RGB LED so that the 2nd RGB LED are presented Light source characteristic, and modulated signal is loaded on the 2nd RGB LED via the second splitter again by the second drive module, complete The transmission of data；By increasing certain reverse bias voltage on the first RGB LED so that the first RGB LED are presented Photodetector characteristic, is detected the 2nd RGB LED data-signals sent, then is received via the first splitter by first Module completes the reception of data-signal；
    Wherein, first and second RGB LED is formed by three color RGB LED being connected in series.
  6. 6. system according to claim 5, it is characterised in that first and second splitter includes a switch chip, and wraps Containing tri- ports of A, B, C, wherein, port A is connected with switch chip, port B and rises and full state of the C by switch chip To connect with port A.
  7. 7. system according to claim 5, it is characterised in that RGB LED send colour developing and are when forward bias voltage drives More than 90, colour temperature is the white light of 3000K-5000K.
  8. 8. system according to claim 5, it is characterised in that the opto-electronic conversion of RGB LED when reverse bias voltage drives Efficiency is more than 0.4A/W.
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