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

Abstract

The invention discloses a half-duplex time-division RGB LED module two-way visible light communication method and system. The RGB LED works in the half-duplex mode and can not only send data as a light source, but also receive data as a photoelectric detector, saving additional The cost of the photodetector; compared with the use of infrared light or Wifi to provide uplink services in the existing visible light communication, the present invention does not need an additional transmission medium, and both uplink and downlink use visible light for data transmission, effectively reducing the complexity of the system implementation.

Description

Half-duplex time-division RGB LED module two-way visible light communication method and system

technical field

The present invention relates to the field of visible light communication, in particular to a half-duplex time-division RGB LED module two-way visible light communication method and system.

Background technique

Visible light communication technology is a communication technology that modulates intensity signals onto visible light LEDs and uses photoelectric detection equipment for detection. Due to its high light efficiency, low power consumption, long service life, and green energy saving, LED is likely to become a new lighting source. On the one hand, the visible light communication technology combined with LED has given full play to the lighting advantages of LED, and at the same time, it combines the communication function with lighting technology, which has attracted extensive attention and research from the scientific community. With the deepening and gradual maturity of research on visible light communication technology, visible light communication technology has gradually attracted the attention of the industry.

At present, most of the research on visible light communication is focused on how to increase the transmission rate of the communication system. The limitation is that most of the LEDs are used as transmitting light sources to provide one-way downlink data transmission services. The actual communication system not only needs the downlink, but also needs to provide the data transmission service of the uplink. There have been related researches that use infrared light or Wifi to provide uplink data transmission services as an auxiliary of visible light communication technology. In fact, the implementation complexity of this multi-mode communication system is undoubtedly very high. In addition, although there have been literatures that have studied R/G/B LEDs as signal sending and signal receiving devices at the same time. However, the R/G/B LEDs of different colors in these documents are driven independently, and the interference of optical signals will be generated between independently driven LEDs of different colors, which reduces the signal-to-interference-noise ratio of the visible light communication system.

Contents of the invention

The purpose of the present invention is to provide a half-duplex time-division RGB LED module two-way visible light communication method and system, which has the advantages of low complexity and low cost.

The purpose of the present invention is achieved through the following technical solutions:

A half-duplex time-division RGB LED module two-way visible light communication method, comprising:

Time division multiplexing is used to divide time into two time slices of equal length, one of which is for uplink data transmission, and the other time slice is for downlink data transmission;

In the data transmission of the downlink, by adding a certain forward bias voltage to the first RGB LED, the first RGB LED exhibits light source characteristics, and the modulated signal passes through the first driving module and then through the first branch The router is loaded on the first RGB LED to complete the data transmission; by increasing a certain reverse bias voltage on the second RGB LED, the second RGB LED exhibits the characteristics of a photodetector, and the first RGB LED is sent The data signal is detected, and then the data signal is received by the second receiving module through the second splitter;

In the data transmission of the uplink, by adding a certain forward bias voltage to the second RGB LED, the second RGB LED exhibits the characteristics of a light source, and the modulated signal passes through the second driving module and then through the second branch The router is loaded on the second RGB LED to complete the sending of data; by adding a certain reverse bias voltage on the first RGB LED, the first RGB LED exhibits the characteristics of a photodetector, and the second RGB LED sends The data signal is detected, and then the data signal is received by the first receiving module through the first splitter.

Further, both the first and the second RGB LEDs are composed of three-color RGB LEDs connected in series.

Further, the first and second splitters contain a switch chip, and include three ports A, B, and C, wherein port A is connected to the switch chip, and ports B and C are controlled by the rising and falling states of the switch chip. to communicate with port A.

Further, when driven by a forward bias voltage, the RGB LED emits white light with a color rendering of over 90 and a color temperature of 3000K-5000K.

Further, the photoelectric conversion efficiency of the RGB LED is greater than 0.4A/W when driven by a reverse bias voltage.

A half-duplex time-division RGB LED module two-way visible light communication system, including:

The first RGB LED module composed of the first splitter, the first RGB LED, the first receiving module and the first driving module, and the second splitter, the second RGB LED, the second receiving module and the second A second RGB LED module composed of a driving module;

Time division multiplexing is used to divide time into two time slices of equal length, one of which is for uplink data transmission, and the other time slice is for downlink data transmission;

In the data transmission of the downlink, the first RGB LED module is used as the data sending end, and the second RGB LED module is used as the data receiving end; by adding a certain forward bias voltage on the first RGB LED, so that The first RGB LED presents light source characteristics, and the modulated signal is loaded to the first RGB LED through the first drive module and then through the first splitter to complete the data transmission; by adding a certain reflective signal to the second RGB LED To the bias voltage, so that the second RGB LED presents the characteristics of a photodetector, detects the data signal sent by the first RGB LED, and then completes the reception of the data signal by the second receiving module through the second splitter;

In the data transmission of the uplink, the second RGB LED module is used as the data sending end, and the first RGB LED module is used as the data receiving end; by adding a certain forward bias voltage on the second RGB LED, so that The second RGB LED presents the characteristics of the light source, and the modulated signal is loaded to the second RGB LED through the second drive module and then through the second splitter to complete the data transmission; by adding a certain reflective signal to the first RGB LED The bias voltage is applied so that the first RGB LED exhibits the characteristics of a photodetector, and the data signal sent by the second RGB LED is detected, and then the data signal is received by the first receiving module through the first splitter.

Further, both the first and the second RGB LEDs are composed of three-color RGB LEDs connected in series.

Further, the first and second splitters contain a switch chip, and include three ports A, B, and C, wherein port A is connected to the switch chip, and ports B and C are controlled by the rising and falling states of the switch chip. to communicate with port A.

Further, when driven by a forward bias voltage, the RGB LED emits white light with a color rendering of over 90 and a color temperature of 3000K-5000K.

Further, the photoelectric conversion efficiency of the RGB LED is greater than 0.4A/W when driven by a reverse bias voltage.

It can be seen from the above-mentioned technical solution provided by the present invention that the RGB LED works in half-duplex mode, and can not only send data as a light source, but also receive data as a photodetector, which saves the cost of an additional photodetector; Compared with using infrared light or Wifi to provide uplink services in visible light communication, the present invention does not require an additional transmission medium, and both uplink and downlink use visible light for data transmission, which effectively reduces the complexity of system implementation. In addition, in this solution, LEDs of different colors of R/G/B LEDs are connected in series with each other. This structure can improve the anti-interference ability of the visible light communication system where R/G/B LEDs are simultaneously used as wireless optical signal transmission and wireless optical signal receiving ends. .

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is a schematic diagram of the principle of bidirectional visible light communication of a half-duplex time-division RGB LED module provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a splitter provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a time synchronization establishment stage between a data receiving end and a data sending end provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of a bidirectional link establishment phase provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a half-duplex time-division RGB LED module two-way visible light communication method, which includes:

Time division multiplexing is used to divide time into two time slices of equal length, one of which is for uplink data transmission, and the other time slice is for downlink data transmission;

As shown in Figure 1, in the downlink data transmission, by adding a certain forward bias voltage to the first RGB LED, the first RGB LED exhibits light source characteristics, and the modulated signal is passed through the first drive The module is then loaded onto the first RGB LED via the first splitter to complete the data transmission; by adding a certain reverse bias voltage to the second RGB LED, the second RGB LED exhibits photodetector characteristics, Detect the data signal sent by the first RGB LED, and then complete the reception of the data signal by the second receiving module through the second splitter;

In the data transmission of the uplink, by adding a certain forward bias voltage to the second RGB LED, the second RGB LED exhibits the characteristics of a light source, and the modulated signal passes through the second driving module and then through the second branch The router is loaded on the second RGB LED to complete the sending of data; by adding a certain reverse bias voltage on the first RGB LED, the first RGB LED exhibits the characteristics of a photodetector, and the second RGB LED sends The data signal is detected, and then the data signal is received by the first receiving module through the first splitter.

In the embodiment of the present invention, both the first and the second RGB LEDs are composed of three-color RGB LEDs connected in series; this structure can improve the visible light communication system in which the R/G/B LEDs simultaneously serve as wireless optical signal sending and wireless optical signal receiving ends anti-interference ability.

As shown in Figure 2, the first and second shunts contain a switch chip and include three ports A, B, and C, wherein port A is connected to the switch chip, and ports B and C are connected to each other by raising the switch chip. Connect to port A with the down state.

In the embodiment of the present invention, when driven by a forward bias voltage, the RGB LED emits white light with a color rendering of over 90 and a color temperature of 3000K-5000K; when driven by a reverse bias voltage, the photoelectric conversion efficiency of the RGB LED is greater than 0.4A/W.

Preferably, before data transmission, time synchronization between the data receiving end and the data sending end needs to be performed, and the process is shown in FIG. 3 . Afterwards, a bidirectional link as shown in FIG. 4 is established for data transmission.

On the other hand, the embodiment of the present invention also provides a half-duplex time-division RGB LED module two-way visible light communication system corresponding to the aforementioned method, which includes:

The first RGB LED module composed of the first splitter, the first RGB LED, the first receiving module, and the first driving module in a time-division multiplexing manner, and the second splitter, the second RGB LED, and the second RGB LED module A second RGB LED module composed of a second receiving module and a second driving module;

Divide time into two time slices of equal length, one of which is for uplink data transmission, and the other time slice is for downlink data transmission;

Referring also to Fig. 1, in the data transmission of the downlink, the first RGB LED module is used as the data sending end, and the second RGB LED module is used as the data receiving end; by adding a certain positive direction to the first RGB LED Bias voltage, so that the first RGB LED exhibits light source characteristics, and the modulation signal is loaded on the first RGB LED through the first drive module and then through the first splitter to complete the transmission of data; through the second RGB LED Add a certain reverse bias voltage on the LED, so that the second RGB LED exhibits the characteristics of a photodetector, detect the data signal sent by the first RGB LED, and then complete the reception of the data signal by the second receiving module through the second splitter ;

In the data transmission of the uplink, the second RGB LED module is used as the data sending end, and the first RGB LED module is used as the data receiving end; by adding a certain forward bias voltage on the second RGB LED, so that The second RGB LED presents the characteristics of the light source, and the modulated signal is loaded to the second RGB LED through the second drive module and then through the second splitter to complete the data transmission; by adding a certain reflective signal to the first RGB LED The bias voltage is applied so that the first RGB LED exhibits the characteristics of a photodetector, and the data signal sent by the second RGB LED is detected, and then the data signal is received by the first receiving module through the first splitter.

In the embodiment of the present invention, both the first and the second RGB LEDs are composed of three-color RGB LEDs connected in series.

Also referring to Fig. 2, the first and second shunts contain a switch chip and include three ports A, B, and C, wherein port A is connected to the switch chip, and ports B and C are connected to each other through the rising and closing of the switch chip. Fall state to communicate with port A.

In the embodiment of the present invention, when driven by a forward bias voltage, the RGB LED emits white light with a color rendering of over 90 and a color temperature of 3000K-5000K; when driven by a reverse bias voltage, the photoelectric conversion efficiency of the RGB LED is greater than 0.4A/W.

Preferably, before data transmission, time synchronization between the data receiving end and the data sending end needs to be performed, and the process is shown in FIG. 3 . Afterwards, a bidirectional link as shown in FIG. 4 is established for data transmission.

In addition, those skilled in the art can understand that the first and second in the embodiment of the present invention are only used to distinguish the same device.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

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.