CN110995346A - Light source for multi-channel visible light communication system - Google Patents
Light source for multi-channel visible light communication system Download PDFInfo
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- CN110995346A CN110995346A CN201911172752.5A CN201911172752A CN110995346A CN 110995346 A CN110995346 A CN 110995346A CN 201911172752 A CN201911172752 A CN 201911172752A CN 110995346 A CN110995346 A CN 110995346A
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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
Abstract
The invention relates to a light source for a multichannel visible light communication system, which comprises a signal processing module, an LED driving module, an LED emitting module, an optical emitting antenna and a power supply module, wherein the signal processing module receives an external signal and generates a corresponding modulation signal; the power supply module supplies power to the signal processing module and the LED driving module. The light source can simultaneously emit multiple paths of different light signals and can realize uniform illumination of any color.
Description
Technical Field
The invention relates to the technical field of visible light communication, in particular to a light source for a multi-channel visible light communication system.
Background
With the advent of the mobile internet era and the emergence of new applications of various new contents, the intelligent mobile terminal is popular all over the world, and the number of mobile users and data traffic are explosively increased. In addition, the rapid development of emerging industries such as the internet of things and the like puts forward the requirements of ultra-large capacity and ultra-high speed on a communication system, and some novel wireless communication technologies appear in succession to improve the system capacity and the frequency spectrum utilization rate. The visible light communication technology is developed in the environment, and is taken as an important mode which can effectively solve the problem of the shortage of the current radio frequency communication frequency band and simultaneously solve the problem of last-mile wireless communication.
Compared with the traditional radio frequency communication technology, the visible light communication technology which gives consideration to both illumination and communication has the advantages of large potential bandwidth, no spectrum license, no electromagnetic radiation, strong anti-electromagnetic interference capability, higher safety and confidentiality, capability of realizing high-speed and high-efficiency transmission and the like. Therefore, the electromagnetic interference shielding material is suitable for indoor home and places sensitive to electromagnetic interference, such as hospitals, aircrafts and the like.
In a visible light communication system, a wavelength division multiplexing technology can form a multi-channel visible light communication system by increasing the number of signal channels, thereby greatly improving the communication speed of the system. Most of the current multi-channel visible light communication systems are based on an RGB three-color LED chip or an RGBA four-color LED chip, only 4-path signal communication can be realized at most, and the spectrum resources of visible light are not fully utilized.
Disclosure of Invention
The invention aims to provide a multi-channel visible light communication light source which is based on a single-color LED, can simultaneously send multiple paths of visible light signals and is provided with an optical transmitting antenna.
The technical solution is as follows:
a light source for a multi-channel visible light communication system comprises a signal processing module, an LED driving module, an LED emitting module, an optical emitting antenna and a power supply module, wherein the light source can emit multiple paths of different light signals at the same time and can realize uniform illumination of any color; the signal processing module is used for receiving external data signals, generating a plurality of paths of modulation signals with corresponding frequencies and modulation modes according to input signals, and then respectively sending the modulated signals to the plurality of LED driving modules; the LED driving module is used for receiving the modulation signal, converting the modulation signal into a current signal required by the corresponding LED, and then sending the current signal to the LED transmitting module; the LED transmitting module is used for converting the electric signal into an optical signal and sending the optical signal to the outside; the optical transmitting antenna is used for mixing the colors of the monochromatic lights to obtain illuminating light with uniform color, so that the output light has a communication function while realizing uniform illumination; the power module is used for converting 220V alternating current into a low-voltage direct current power supply and supplying power to the signal processing module and the LED driving module.
The signal processing module comprises an SMA signal interface, an FPGA processor, a FLASH memory and a power circuit; the SMA signal interface is used for accessing an external signal; the FPGA processor is used for processing and modulating signals; the FLASH memory is used for storing data; the power circuit is connected with the power module and used for supplying power to each submodule of the signal processing module.
The LED driving module comprises a D/A conversion circuit, an alternating current driving circuit, a direct current driving circuit, a Bias-tee signal coupling circuit and a power circuit; the D/A conversion circuit realizes digital-to-analog conversion of the modulation signal; the alternating current driving circuit is used for converting the modulation signal into an alternating current signal which can be superposed on direct current; the direct current driving circuit is used for outputting constant direct current to drive the LED to emit light; the Bias-tee signal coupling circuit is used for finishing superposition of output signals of direct current drive and alternating current drive so as to drive the LED to emit light and communicate; the power circuit is connected with the power module and is used for supplying power to each sub-module of the LED driving module; the LED driving module is provided with a plurality of independent LED driving modules.
The LED emitting module comprises a plurality of single-color LED chips and an LED fixing and radiating structure; the multiple single-color LED chips are all positioned in a visible light spectrum range (400-760nm) and are used for respectively transmitting multi-path modulation signals;
the optical transmitting antenna comprises an optical integrating rod, a Fresnel mirror and a shell; the optical integrating rod is used for mixing the colors of the multiple paths of monochromatic light to realize uniform light illumination; the Fresnel lens is used for improving the system gain so as to meet the requirements of illumination and communication; the shell is used for fixing the optical integrator rod and the Fresnel mirror.
Compared with the prior multi-channel visible light communication system light source, the invention has the following advantages:
(1) based on a single-color LED, the LED can simultaneously emit multiple paths of visible light signals, and is not limited by the limitation that a multicolor LED chip can only emit 4 paths of light signals at most;
(2) the spectrum coverage range is the whole visible light spectrum range (400-760nm), and the colors of all paths of signal light can be freely combined;
(3) the color of the light source can be controlled by adjusting the proportion of each monochromatic light, so that the illumination of any color light is realized;
(4) the structure of the optical integrating rod can better mix the colors of the multiple monochromatic lights to realize uniform light illumination;
(5) the structure of the Fresnel mirror is adopted, and the emergent surface of the light homogenizing rod is transmitted to the signal receiving surface in an imaging mode, so that the system gain can be improved, and the requirements on illumination and communication are met.
Drawings
Fig. 1 is a schematic view of a light source of the present invention.
Fig. 2 is a schematic view of an LED structure according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the optical transmitting antenna according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of an LED arrangement according to embodiment 1 of the present invention.
Fig. 5 is a schematic diagram of an LED arrangement according to embodiment 2 of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1:
as shown in fig. 1, a light source for a multichannel visible light communication system includes a signal processing module 1, an LED driving module 2, an LED emitting module 3, an optical emitting antenna 4, and a power supply module 5. In the light source, a signal processing module receives an external data signal through an SMA signal interface and generates 4 paths of modulation signals with specific frequency and modulation modes. The 4 modulated signals are sent to 4 LED driver modules. The 4 LED driving modules respectively convert the received modulation signals into current signals required by the 4 monochromatic LEDs and then send the current signals to the LED modules. The LED emission module is distributed with 4 single-color LEDs and is provided with a corresponding fixing and heat dissipation structure. The 4 LEDs convert the received current signals into 4 paths of optical signals to be sent out. The optical transmitting antenna mixes the colors of the monochromatic lights to obtain illuminating light with uniform color, so that the output light has a communication function while realizing uniform illumination; the power supply module is used for converting 220V alternating current into a low-voltage direct current power supply and supplying power to the signal processing module and the LED driving module.
In the present embodiment, the 4 kinds of monochrome LEDs are selected from monochrome LEDs of a color LED series manufactured by LUXEON Rebel corporation. The series of single-color LEDs have excellent power efficiency, color stability, flux density and color saturation, and are the best choice for the single-color LED light source of the multi-channel visible light communication system. The models of the four monochromatic LEDs are LXM2-PD01-0050 (red lamp with 627nm central wavelength), LXML-PM01-0100 (green lamp with 531nm central wavelength), LXML-PB02 (blue lamp with 470nm central wavelength) and LXML-PL01-0060 (yellow lamp with 590nm central wavelength).
Referring to fig. 2, the outline structure of the 4 kinds of single-color LEDs includes a light emitting chip 6 and a substrate 7. The light emitting chip is a circle with a radius of 1.58mm, and the substrate is a rectangle with a radius of 4.61mm multiplied by 3.17 mm.
With reference to fig. 4, the 4 kinds of monochromatic LEDs are closely arranged in a 2 × 2 manner, and the circle center intervals of the circular light emitting areas of two adjacent LEDs are both 4.3 mm.
In this embodiment, the LED driving module includes a D/a conversion circuit, an ac driving circuit, a dc driving circuit, a Bias-tee signal coupling circuit, and a power circuit. The D/A conversion circuit takes the chips AD780 and LTC1655 as cores, and realizes digital-to-analog conversion on the modulation signals; the alternating current driving circuit adopts MOS driving, takes a chip ADP3624 as a core and converts a modulation signal into an alternating current signal which can be superposed on direct current; the direct current driving circuit adopts a DC/DC voltage reduction circuit and outputs constant direct current to drive the LED to emit light; the Bias-tee signal coupling circuit mainly comprises an inductor and a capacitor, and completes the superposition of output signals of direct current drive and alternating current drive so as to drive the LED to emit light and communicate; the power supply circuit adopts a power supply chip TPS75003 to provide corresponding direct current power supply for each submodule of the LED driving module. The LED driving modules are totally 4 and independent from each other.
Referring to fig. 3, the optical transmitting antenna includes an optical integrator rod 8, a fresnel mirror 9, and a housing 10. The optical integrating rod adopts a hexagonal light homogenizing rod structure which is 5cm in length, 0.8cm in aperture and made of BK7 material, and 4 paths of monochromatic light are subjected to color mixing to realize uniform light illumination; the Fresnel mirror is made of acrylic materials, two Fresnel mirrors with the focal length of 25mm, the caliber of 25.4mm and the thickness of 1.5mm are selected, and the emergent surface of the light homogenizing rod is transmitted to a signal receiving surface in an imaging mode to improve the system gain so as to meet the requirements of illumination and communication; the total size of the shell is 6.6cm, and the optical integrating rod and the Fresnel mirror are fixed by the clamping groove in the shell, so that the stability of the optical transmitting antenna is ensured.
Example 2:
as shown in fig. 1, a light source for a multichannel visible light communication system includes a signal processing module 1, an LED driving module 2, an LED emitting module 3, an optical emitting antenna 4, and a power supply module 5. In the light source, a signal processing module receives an external data signal through an SMA signal interface and generates 5 paths of modulation signals with specific frequency and modulation modes. The 5 modulated signals are sent to 5 LED driver modules. The 5 LED driving modules respectively convert the received modulation signals into current signals required by 5 monochromatic LEDs and then send the current signals to the LED modules. The LED emission module is distributed with 5 single-color LEDs and is provided with corresponding fixing and heat dissipation structures. The 5 LEDs convert the received current signals into 5 paths of optical signals to be sent out. The optical transmitting antenna mixes the colors of the monochromatic lights to obtain illuminating light with uniform color, so that the output light has a communication function while realizing uniform illumination; the power supply module is used for converting 220V alternating current into a low-voltage direct current power supply and supplying power to the signal processing module and the LED driving module.
Referring to fig. 2, the outline structure of the 5 kinds of single-color LEDs includes a light emitting chip 6 and a substrate 7. The light emitting chip is a circle with a radius of 1.58mm, and the substrate is a rectangle with a radius of 4.61mm multiplied by 3.17 mm.
In connection with fig. 5, the 5 single color LEDs are closely arranged in a regular pentagonal manner. Compared with embodiment 1, embodiment 2 provides a 5-channel visible light communication system light source. The 5 kinds of single-color LEDs belong to single-color LEDs of a color LED series produced by LUXEON Rebel company, and are respectively LXM2-PD01-0050 (red lamp, central wavelength 627nm), LXML-PM01-0100 (green lamp, central wavelength 531nm), LXML-PB02 (blue lamp, central wavelength 570nm), LXML-PL01-0060 (yellow lamp, central wavelength 590nm) and LXM2-PH01-0060 (orange lamp, central wavelength 617 nm). The number of the LED driving modules is 5.
In this embodiment, the LED driving module includes a D/a conversion circuit, an ac driving circuit, a dc driving circuit, a Bias-tee signal coupling circuit, and a power circuit. The D/A conversion circuit takes the chips AD780 and LTC1655 as cores, and realizes digital-to-analog conversion on the modulation signals; the alternating current driving circuit adopts MOS driving, takes a chip ADP3624 as a core and converts a modulation signal into an alternating current signal which can be superposed on direct current; the direct current driving circuit adopts a DC/DC voltage reduction circuit and outputs constant direct current to drive the LED to emit light; the Bias-tee signal coupling circuit mainly comprises an inductor and a capacitor, and completes the superposition of output signals of direct current drive and alternating current drive so as to drive the LED to emit light and communicate; the power supply circuit adopts a power supply chip TPS75003 to provide corresponding direct current power supply for each submodule of the LED driving module. The number of the LED driving modules is 5 and is independent.
Referring to fig. 3, the optical transmitting antenna includes an optical integrator rod 8, a fresnel mirror 9, and a housing 10. The optical integrator rod has a length of 8cm and an aperture of 2 cm. The hexagonal light homogenizing rod structure made of BK7 materials is used for mixing 5 paths of monochromatic light in color to realize light homogenizing illumination; the Fresnel mirror is made of acrylic materials, two Fresnel mirrors with the focal length of 25mm, the caliber of 25.4mm and the thickness of 1.5mm are selected, and the emergent surface of the light homogenizing rod is transmitted to a signal receiving surface in an imaging mode to improve the system gain so as to meet the requirements of illumination and communication; the total size of the shell is 6.6cm, and the optical integrating rod and the Fresnel mirror are fixed by the clamping groove in the shell, so that the stability of the optical transmitting antenna is ensured.
The technical contents not described in the above embodiments can be implemented by taking or referring to the existing technologies.
It should be noted that the present disclosure describes only a preferred embodiment of the present invention, and the above embodiment is only used to illustrate the technical solution of the present invention and not to limit the present invention. Those skilled in the art can obtain technical solutions through logical analysis, reasoning or limited experiments according to the concepts of the present invention, and all such technical solutions are within the scope of the present invention.
Claims (5)
1. The utility model provides a light source for multichannel visible light communication system, includes signal processing module, LED drive module, LED emission module, optics transmitting antenna, power module which characterized in that: the light source can simultaneously emit multiple paths of different light signals and can realize uniform illumination of any color;
the signal processing module is used for receiving external data signals, generating a plurality of paths of modulation signals with corresponding frequencies and modulation modes according to input signals, and then respectively sending the modulated signals to the plurality of LED driving modules;
the LED driving module is used for receiving the modulation signal, converting the modulation signal into a current signal required by the corresponding LED, and then sending the current signal to the LED transmitting module;
the LED transmitting module is used for converting the electric signal into an optical signal and sending the optical signal to the outside;
the optical transmitting antenna is used for mixing the colors of the monochromatic lights to obtain illuminating light with uniform color, so that the output light has a communication function while realizing uniform illumination;
the power module is used for converting 220V alternating current into a low-voltage direct current power supply and supplying power to the signal processing module and the LED driving module.
2. A light source for a multichannel visible light communication system according to claim 1, characterized in that: the signal processing module comprises an SMA signal interface, an FPGA processor, a FLASH memory and a power circuit; the SMA signal interface is used for accessing an external signal; the FPGA processor is used for processing and modulating signals; the FLASH memory is used for storing data; the power circuit is connected with the power module and used for supplying power to each submodule of the signal processing module.
3. A light source for a multichannel visible light communication system according to claim 1, characterized in that: the LED driving module comprises a D/A conversion circuit, an alternating current driving circuit, a direct current driving circuit, a Bias-tee signal coupling circuit and a power circuit; the D/A conversion circuit realizes digital-to-analog conversion of the modulation signal; the alternating current driving circuit is used for converting the modulation signal into an alternating current signal which can be superposed on direct current; the direct current driving circuit is used for outputting constant direct current to drive the LED to emit light; the Bias-tee signal coupling circuit is used for finishing superposition of output signals of direct current drive and alternating current drive so as to drive the LED to emit light and communicate; the power circuit is connected with the power module and is used for supplying power to each sub-module of the LED driving module; the LED driving module is provided with a plurality of independent LED driving modules.
4. A light source for a multichannel visible light communication system according to claim 1, characterized in that: the LED emitting module comprises a plurality of single-color LED chips and an LED fixing and radiating structure; the multiple single-color LED chips are all in the visible light spectrum range (400-760nm) and are used for respectively transmitting the multi-path modulation signals.
5. A light source for a multichannel visible light communication system according to claim 1, characterized in that: the optical transmitting antenna comprises an optical integrating rod, a Fresnel mirror and a shell; the optical integrating rod is used for mixing the colors of the multiple paths of monochromatic light to realize uniform light illumination; the Fresnel lens is used for improving the system gain so as to meet the requirements of illumination and communication; the shell is used for fixing the optical integrator rod and the Fresnel mirror.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113141689A (en) * | 2021-04-12 | 2021-07-20 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | MIMO high-speed array type blue-green LED light source for optical communication |
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| CN113141689B (en) * | 2021-04-12 | 2022-10-18 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | MIMO high-speed array type blue-green LED light source for optical communication |
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