Visible light communication system and its transmitter, receiver and method

Abstract

The present invention provides a visible light communication system and a transmitting end, a receiving end and a method thereof. The transmitting end of the visible light communication system comprises: an illumination device for providing illumination light; a first polarizer, which is arranged on the propagation path of the illumination light in a variable frequency rotation manner and is used to frequency modulate the illumination light passing therethrough so that the illumination light carries a communication signal; and an actuator, which is transmission-connected to the first polarizer to drive the first polarizer to rotate. The visible light communication system and the transmitting end, the receiving end and the method thereof of the present invention can make the illumination light emitted by the illumination device carry a communication signal without coding the driving of the illumination device, and the technology is simple and the cost is low.

Description

Technical Field

[0001] The present invention relates to optical communication technology, and in particular to a visible light communication system and a transmitting end, a receiving end and a method thereof. Background Art

[0002] Optical communication is a communication method that uses light waves as carrier waves, while visible light communication (VLC) refers to a communication method that uses high-speed light and dark flickering signals emitted by lighting devices such as fluorescent lamps that are imperceptible to the naked eye as communication signals to transmit information.

[0003] In some visible light communication technologies in the prior art, in order to superimpose the communication signal waves on the light waves emitted by the lighting device in the visible light communication system, it is necessary to encode and modify the driving of the lighting device, which is technically complex and costly.

[0004] Therefore, how to provide a visible light communication system that can enable the illumination light emitted by the illumination device to carry the communication signal without encoding the driver of the illumination device has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] An object of the present invention is to provide a visible light communication system and a transmitting end, a receiving end and a method thereof that at least partially solve the above-mentioned problems.

[0006] A further object of the present invention is to provide a visible light communication system and a transmitter, a receiver and a method thereof, which can enable the illumination light emitted by the illumination device to carry a communication signal without encoding the driver of the illumination device.

[0007] A further object of the present invention is to enable the illumination light of the visible light communication system to carry the communication signal during the propagation process.

[0008] Another further object of the present invention is to improve the scalability of a visible light communication system.

[0009] A further object of the present invention is to enable the visible light communication system to control multiple receiving terminals at the same time, thereby improving the degree of intelligence.

[0010] A further object of the present invention is to enable a visible light communication system to transmit communication signals while maintaining good lighting functions.

[0011] According to one aspect of the present invention, there is provided a transmitting end of a visible light communication system, comprising: an illumination device for providing illumination light; a first polarizer, rotatably arranged at a variable frequency on a propagation path of the illumination light, for frequency modulating the passing illumination light so that the illumination light carries a communication signal; and an actuator, transmission-connected to the first polarizer, to drive the first polarizer to rotate.

[0012] Optionally, the plane where the first polarizer is located is perpendicular to the propagation direction of the illumination light; and the rotation axis of the first polarizer is perpendicular to the plane where the first polarizer is located.

[0013] Optionally, the actuator is a variable frequency motor, which is arranged outside the lighting device; and the actuator has a rotating shaft, and the first polarizer is transmission-connected to the rotating shaft.

[0014] Optionally, the transmitting end of the visible light communication system further includes: a control device, configured to send a control instruction to the actuator, so as to drive the actuator to drive the first polarizer to rotate at a set rotation frequency according to the control instruction.

[0015] Optionally, the first polarizer is arranged outside the lighting device.

[0016] According to another aspect of the present invention, a receiving end of a visible light communication system is provided, comprising: a demodulation device, arranged on a propagation path of an illumination light, wherein the illumination light has been frequency modulated to carry a communication signal, and the demodulation device is used to demodulate the communication signal carried by the illumination light to generate a communication instruction corresponding to the communication signal; and a receiving terminal, communicatively connected to the demodulation device, for receiving the communication instruction from the demodulation device.

[0017] Optionally, the demodulation device includes a second polarizer for preliminarily demodulating the communication signal carried by the illumination light.

[0018] Optionally, the second polarizer is fixedly arranged.

[0019] Optionally, the demodulation device also includes a demodulator, which is arranged downstream of the second polarizer and is communicatively connected to the receiving terminal, for parsing the communication signal after preliminary demodulation by the second polarizer to generate a communication instruction corresponding to the communication signal and transmit the communication instruction to the receiving terminal.

[0020] Optionally, there are multiple receiving terminals.

[0021] According to another aspect of the present invention, a visible light communication system is provided, comprising: a transmitting end of the visible light communication system as described in any one of the above items; and a receiving end of the visible light communication system as described in any one of the above items.

[0022] According to another aspect of the present invention, there is also provided a control method for the transmitting end of any of the above-mentioned visible light communication systems, comprising: driving the lighting device to start to provide illumination light; driving the actuator to drive the first polarizer to rotate at a variable frequency to frequency modulate the illumination light passing through the first polarizer so that the illumination light carries a communication signal.

[0023] According to another aspect of the present invention, there is also provided a control method for a receiving end of a visible light communication system as described above, comprising: driving a demodulation device to demodulate a communication signal carried by an illumination light to generate a communication instruction corresponding to the communication signal; and controlling a receiving terminal according to the communication instruction.

[0024] The visible light communication system and its transmitting end, receiving end and method of the present invention, the transmitting end of the visible light communication system includes an illumination device, a first polarizer, and an actuator. The first polarizer is arranged on the propagation path of the illumination light in a variable frequency rotation manner, and is used to frequency modulate the illumination light passing through so that the illumination light carries the communication signal, thereby making the illumination light emitted by the illumination device carry the communication signal without coding the driving of the illumination device, and the technology is simple and the cost is low.

[0025] Furthermore, in the visible light communication system and its transmitting end, receiving end and method of the present invention, the first polarizer and the actuator are both arranged outside the lighting device, and the illumination light emitted by the lighting device is frequency modulated by the first polarizer when passing through the first polarizer, so that the illumination light of the visible light communication system of the present invention carries the communication signal during the propagation process.

[0026] Furthermore, the visible light communication system and its transmitter, receiver and method of the present invention perform frequency modulation on the illumination light emitted by the illumination device outside the illumination device so that the illumination light carries the communication signal. This can be achieved by only installing a first polarizer and an actuator outside the illumination device. This not only reduces the complexity of the visible light communication system, but also improves the scalability of the visible light communication system.

[0027] Furthermore, the visible light communication system and its transmitting end, receiving end and method of the present invention can have multiple receiving terminals, and multiple receiving terminals can share a demodulation device. The communication instructions generated by the demodulation device after demodulating the communication signal carried by the illumination light can be transmitted to multiple receiving terminals at the same time, so that the visible light communication system of the present invention can control multiple receiving terminals at the same time, thereby improving the degree of intelligence.

[0028] Furthermore, in the visible light communication system and its transmitter, receiver and method of the present invention, the illumination of the lighting device is greater than a preset first threshold, so that the visible light communication system of the present invention can both transmit communication signals and maintain good lighting functions.

[0029] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0031] Figure 1 is a schematic block diagram of a visible light communication system according to an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Schematic diagram of the principle of the visible light communication system shown;

[0033] Figure 3 is a schematic diagram of a visible light communication system according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of a control method of a transmitting end of a visible light communication system according to an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of a control method for a receiving end of a visible light communication system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Figure 1 is a schematic diagram of a visible light communication system 10 according to an embodiment of the present invention.

[0037] The visible light communication system 10 of this embodiment can be used in working environments with large-scale lighting equipment, such as libraries, laboratories, gymnasiums, and museums, to support interconnection between various devices in the working environment, for example, to control or locate various devices.

[0038] The visible light communication system 10 may generally include a transmitting end and a receiving end. The transmitting end may include an illumination device 200, a first polarizer 400, an actuator 300, and may further include a control device 100. The receiving end may include a demodulation device 500 and a receiving terminal 600. The transmitting end forms a signal transmitting end of the visible light communication system 10, which is used to generate a communication signal. The receiving end forms a signal receiving end of the visible light communication system 10, which is used to parse the communication signal to generate a corresponding communication instruction. The demodulation device 500 may include a second polarizer 510 and a demodulator 520.

[0039] Figure 2 yes Figure 1 The schematic diagram of the visible light communication system 10 is shown.

[0040] The illumination light provided by the illumination device 200 is a sine wave. Figure 2 As shown in the dotted frame 101. When the first polarizer 400 performs frequency conversion rotation, the frequency of the illumination light passing through is modulated, so that the frequency of the sine wave after passing through the first polarizer 400 is changed to generate a communication signal. Figure 2 The sine wave encircled by the dotted frame 102 shows the communication signal modulated by the first polarizer, and the illumination light modulated by the first polarizer 400 carries the communication signal. After receiving the illumination light modulated by the first polarizer 400, the second polarizer 510 will perform preliminary demodulation on the communication signal carried by the illumination light, so that the communication signal carried by the illumination light is frequency demodulated. Figure 2 The middle dashed box 103 shows the communication signal demodulated by the second polarizer 210. The demodulator 520 can analyze the communication signal preliminarily demodulated by the second polarizer 510 to generate a communication instruction corresponding to the communication signal, and transmit the communication instruction to the receiving terminal 600.

[0041] Figure 3 is a schematic diagram of a visible light communication system 10 according to an embodiment of the present invention, in which the arrow direction shows the propagation direction of the illumination light.

[0042] The lighting device 200 is used to provide lighting light. In this embodiment, the lighting device 200 can be an LED lamp or a fluorescent lamp, or any other type of lighting device 200, which is not specifically limited here. The optical parameters and electrical parameters of the lighting device 200 can be selected according to the spatial size of the working environment and the installation position of the lighting device 200. The illumination of the lighting device 200 is greater than the preset first threshold, that is, the light intensity per unit area in the working environment is greater than the first threshold. The first threshold can be pre-set according to the spatial size of the working environment and the spatial position of the lighting device 200 in the working environment. For example, the first threshold can be any value in the range of 5 to 20lx. Luminous flux is a key factor affecting illumination. Based on the understanding of illumination, the spatial size of the working environment and the spatial position of the lighting device 200 in the working environment, those skilled in the art are familiar with the method of selecting the luminous flux size, so no specific examples are given here.

[0043] In this embodiment, the luminous flux of the lighting device 200 is greater than a preset first threshold value, so that the visible light communication system 10 of this embodiment can both transmit communication signals and maintain a good lighting function.

[0044] The first polarizer 400 is arranged on the propagation path of the illumination light in a variable frequency rotatable manner, and is used to frequency modulate the illumination light passing through so that the illumination light carries the communication signal. The plane where the first polarizer 400 is located is perpendicular to the propagation direction of the illumination light. And the rotation axis of the first polarizer 400 is perpendicular to the plane where the first polarizer 400 is located.

[0045] In this embodiment, the first polarizer 400 is disposed outside the lighting device 200, and the distance between the first polarizer 400 and the lighting device 200 is less than the preset second threshold. The second threshold can be any value in the range of 0.5 to 2 cm, for example, 0.5 cm, 1 cm, 1.5 cm or 2 cm.

[0046] For example, the lighting device 200 can be ceiling-mounted, the first polarizer 400 can be arranged below the lighting device 200, the plane where the first polarizer 400 is located can extend in the horizontal direction, and the distance between the first polarizer 400 and the lighting device 200 can be approximately 1 cm, and the rotation axis of the first polarizer 400 can extend in the vertical direction.

[0047] The size of the first polarizer 400 can be adapted to the size of the lighting device 200 , so that almost all of the illumination light emitted by the lighting device 200 can pass through the first polarizer 400 .

[0048] The actuator 300 is in transmission connection with the first polarizer 400 to drive the first polarizer 400 to rotate. In this embodiment, the actuator 300 can be a variable frequency motor, which is arranged outside the lighting device 200. The actuator 300 has a rotating shaft, and the first polarizer 400 is in transmission connection with the rotating shaft, so that the rotation frequency of the first polarizer 400 is consistent with the rotation frequency of the rotating shaft.

[0049] In some optional embodiments, the visible light communication system 10 may further include a first base for mounting a first polarizer 400. The first polarizer 400 may be mounted on the first base and fixedly connected to the first base, and the rotating shaft of the actuator 300 may be transmission-connected to the first base to drive the first base to rotate, so that the first polarizer 400 may rotate indirectly driven by the actuator 300. The first base may be substantially a rotatable support platform.

[0050] The first polarizer 400 and the actuator 300 of this embodiment are both arranged outside the lighting device 200. The illumination light emitted by the lighting device 200 is frequency modulated by the first polarizer 400 when passing through the first polarizer 400, so that the illumination light of the visible light communication system 10 of this embodiment carries the communication signal during the propagation process.

[0051] By frequency modulating the illumination light emitted by the illumination device 200 outside the illumination device 200 so that the illumination light carries a communication signal, this can be achieved by only installing a first polarizer 400 and an actuator 300 outside the illumination device 200. This not only reduces the complexity of the visible light communication system 10, but also improves the scalability of the visible light communication system 10.

[0052] The demodulation device 500 is arranged on the propagation path of the illumination light, wherein the illumination light has been frequency modulated to carry the communication signal. In this embodiment, the demodulation device 500 can be located downstream of the first polarizer 400. The demodulation device 500 is used to demodulate the communication signal carried by the illumination light to generate a communication instruction corresponding to the communication signal. In this embodiment, the demodulation device 500 can also transmit the communication instruction to the receiving terminal 600.

[0053] The second polarizer 510 of the demodulation device 500 can be arranged downstream of the first polarizer 400 to perform preliminary demodulation on the communication signal carried by the illumination light. Here, "downstream" refers to the propagation path of the illumination light. The second polarizer 510 being arranged downstream of the first polarizer 400 means that the illumination light first passes through the first polarizer 400 and then passes through the second polarizer 510.

[0054] The second polarizer 510 is fixedly arranged, that is, the second polarizer 510 is in a stationary state. The present embodiment does not specifically limit the arrangement position of the second polarizer 510, as long as the second polarizer 510 can be irradiated by the illumination light. For example, the second polarizer 510 can be arranged below the first polarizer 400. The plane where the second polarizer 510 is located can be parallel to the plane where the first polarizer 400 is located.

[0055] After receiving the illumination light modulated by the first polarizer 400, the second polarizer 510 will preliminarily demodulate the communication signal carried by the illumination light, so that the communication signal carried by the illumination light passing through the second polarizer 510 is frequency demodulated.

[0056] The demodulator 520 is disposed downstream of the second polarizer 510 and is in communication connection with the receiving terminal 600 for parsing the communication signal preliminarily demodulated by the second polarizer 510 to generate a communication instruction corresponding to the communication signal and transmit the communication instruction to the receiving terminal 600 .

[0057] The receiving terminal 600 is connected in communication with the demodulation device 500, and is used to receive the communication instruction from the demodulation device 500. The receiving terminal 600 can establish a communication connection with the demodulator 520. There are one or more receiving terminals 600. The receiving terminal 600 can be any terminal device in the visible light communication system 10. In some optional embodiments, the receiving terminal 600 can be a mobile terminal, such as a mobile phone, etc.; in other optional embodiments, the receiving terminal 600 can also be a fixed terminal, such as other lighting devices in the visible light communication system 10, such as LED lights, etc.

[0058] In this embodiment, each receiving terminal 600 may be configured with one demodulation device 500 , and the number of receiving terminals 600 may be the same as the number of demodulation devices 500 . That is, each demodulation device 500 establishes a communication connection with only one receiving terminal 600 .

[0059] In some optional embodiments, multiple receiving terminals 600 may share one demodulation device 500, that is, the same demodulation device 500 may simultaneously establish communication connections with multiple receiving terminals 600. The communication instructions generated by the demodulation device 500 after demodulating the communication signal carried by the illumination light may be transmitted to multiple receiving terminals 600 at the same time, so that the visible light communication system 10 of this embodiment can control multiple receiving terminals 600 at the same time, thereby improving the degree of intelligence.

[0060] The control device 100 can be a main control chip, which is used to send a control instruction to the actuator 300 to drive the actuator 300 to drive the first polarizer 400 to rotate at a set rotation frequency according to the control instruction, that is, to control the working parameters of the actuator 300, such as the start and stop of the actuator 300, and the rotation frequency. The actuator 300 can rotate according to the set rotation frequency indicated by the control instruction, and the set rotation frequency indicated by the control instruction refers to the rotation frequency corresponding to each moment or each time period after the actuator 300 starts running. The connection method between the actuator 300 and the main control chip can be arbitrarily set according to actual conditions. For example, the actuator 300 can be connected to the main control chip through an external pin. In other words, the actuator 300 is controlled to start under the drive of the control device 100, and rotates according to the instruction issued by the control device 100, wherein the set rotation frequency of the actuator 300 is specified in the instruction issued by the control device. In this embodiment, the control device 100 can also control the lighting device 200 to start up, so that the lighting device 200 provides lighting light.

[0061] The control device 100 may be disposed in the lighting device 200. In some other optional embodiments, the control device 100 may also be disposed outside the lighting device 200.

[0062] The control device 100 may include a memory 120 and a processor 110. Among them, a control program 121 is stored in the memory 120, and when the control program 121 is executed by the processor 110, it is used to implement the control method of the transmitting end of the visible light communication system 10 of any of the following embodiments. The processor 110 may be a central processing unit (CPU), or a digital processing unit (DSP), etc. The memory 120 is used to store the program executed by the processor 110. The memory 120 may be any medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited to this. The memory 120 may also be a combination of various memories 120. Since the control program 121 implements the various processes of the following method embodiments when it is executed by the processor 110, and can achieve the same technical effect, it will not be repeated here to avoid repetition.

[0063] Figure 4 is a schematic diagram of a control method of a transmitting end of a visible light communication system 10 according to an embodiment of the present invention. The control method may generally include:

[0064] Step S402: driving the lighting device 200 to start up to provide lighting light. The control device 100 may send a start signal to the lighting device 200 according to a preset start-stop cycle, so that the lighting device 200 enters a working state to emit lighting light. For example, the control device 100 may send a start signal to the lighting device 200 at 8:00 am every day.

[0065] In step S404, the actuator 300 is driven to drive the first polarizer 400 to rotate at a variable frequency, so as to frequency modulate the illumination light passing through the first polarizer, so that the illumination light carries the communication signal.

[0066] The actuator 300 may be preset with multiple rotation schemes, each of which specifies the corresponding relationship between the rotation frequency and time. Each communication signal may correspond to a rotation scheme. In other words, the actuator 300 may perform variable frequency rotation according to different rotation schemes, so that the illumination light may carry different communication signals.

[0067] In some optional embodiments, the control device 100 may also establish a communication connection with a receiving end of the visible light communication system 10. When the control device 100 is executed by the processor 110, it may also be used to implement a control method of a receiving end of the visible light communication system 10 of any of the following embodiments. Figure 5 is a schematic diagram of a control method of a receiving end of a visible light communication system 10 according to an embodiment of the present invention. The control method may generally include:

[0068] Step S502 : driving the demodulation device 500 to demodulate the communication signal carried by the illumination light to generate a communication instruction corresponding to the communication signal. In this embodiment, the demodulation device 500 may also transmit the communication instruction to the receiving terminal 600 .

[0069] The demodulation device 500 may include a second polarizer 510 and a demodulator 520. The second polarizer 510 is disposed downstream of the first polarizer 400 and is used to perform preliminary demodulation on the communication signal carried by the illumination light. The demodulator 520 may parse the communication signal after preliminary demodulation by the second polarizer 510 to generate a communication instruction corresponding to the communication signal, and transmit the communication instruction to the receiving terminal 600.

[0070] Step S504, controlling the receiving terminal 600 according to the communication instruction. After receiving the communication instruction, the receiving terminal 600 can perform the corresponding function according to the communication instruction. For example, if the receiving terminal 600 is other lighting equipment in the visible light communication system 10, and the communication instruction is a "light-on instruction", the receiving terminal 600 can automatically start and emit light after receiving the communication instruction to illuminate at least a part of the area where the receiving terminal 600 is located.

[0071] The visible light communication system 10 and its control method are described in detail below by taking the visible light communication system 10 suitable for libraries as an example. Those skilled in the art should be fully capable of expanding the application scenarios based on their understanding of this embodiment, and examples will not be given one by one here.

[0072] The lighting device 200 may be a ceiling lamp arranged in a certain area of ​​the library, and the ceiling lamp may be an intelligent lamp. The receiving terminal 600 may be a plurality of lighting lamps arranged in other areas of the library. When it is necessary to send a "light-on command" to a plurality of lighting lamps, the control device 100 drives the lighting device 200 to start to provide lighting light. The actuator 300 drives the first polarizer 400 to perform frequency conversion rotation according to the rotation scheme corresponding to the "light-on command" to frequency modulate the passing lighting light so that the lighting light carries the communication signal corresponding to the "light-on command". The second polarizer 510 frequency demodulates the communication signal carried by the passing lighting light, and the demodulator 520 analyzes the communication signal preliminarily demodulated by the second polarizer 510 to generate a communication command corresponding to the communication signal, i.e., the "light-on command", and transmits the "light-on command" to the receiving terminal 600 to control the multiple lighting lamps of the receiving terminal 600 to automatically start and emit light to illuminate at least a part of the area where the receiving terminal 600 is located.

[0073] The visible light communication system 10 and its transmitting end, receiving end and method of this embodiment include an illumination device 200, a first polarizer 400, an actuator 300, a demodulation device 500 and a receiving terminal 600. The first polarizer 400 is arranged on the propagation path of the illumination light in a variable frequency rotation manner, and is used to frequency modulate the illumination light passing through so that the illumination light carries the communication signal, thereby making the illumination light emitted by the illumination device 200 carry the communication signal without coding the driving of the illumination device 200, which is simple in technology and low in cost.

[0074] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A transmitting end of a visible light communication system, characterized in that: include: A lighting device for providing lighting light; A first polarizer is rotatably arranged on the propagation path of the illumination light and is used to frequency modulate the passing illumination light so that the illumination light carries the communication signal; an actuator, drivingly connected to the first polarizer to drive the first polarizer to rotate; The actuator is a variable frequency motor, which is arranged outside the lighting device; and The actuator has a rotating shaft, and the first polarizer is transmission-connected to the rotating shaft; The transmitting end of the visible light communication system further includes: The control device is used to send a control instruction to the actuator to drive the actuator to drive the first polarizer to rotate at a set rotation frequency according to the control instruction.

2. The transmitting end of the visible light communication system according to claim 1, characterized in that: The plane where the first polarizer is located is perpendicular to the propagation direction of the illumination light; and The rotation axis of the first polarizer is perpendicular to the plane where the first polarizer is located.

3. The transmitting end of the visible light communication system according to claim 1, characterized in that: The first polarizer is arranged outside the lighting device.

4. A receiving end of a visible light communication system, characterized in that: include: A demodulation device is arranged on the propagation path of the illumination light, wherein the illumination light has been frequency modulated to carry a communication signal, and the demodulation device is used to demodulate the communication signal carried by the illumination light to generate a communication instruction corresponding to the communication signal; A receiving terminal, connected to the demodulation device for receiving the communication instruction from the demodulation device; The demodulation device includes a second polarizer for preliminarily demodulating the communication signal carried by the illumination light; The demodulation device also includes a demodulator, which is arranged downstream of the second polarizer and is communicatively connected to the receiving terminal, and is used to parse the communication signal after preliminary demodulation by the second polarizer to generate the communication instruction corresponding to the communication signal, and transmit the communication instruction to the receiving terminal.

5. The receiving end of the visible light communication system according to claim 4, characterized in that: The second polarizer is fixedly arranged.

6. The receiving end of the visible light communication system according to claim 4, characterized in that: There are multiple receiving terminals.

7. A visible light communication system, characterized in that: include: A transmitting end of a visible light communication system as claimed in any one of claims 1 to 3; and A receiving end of a visible light communication system as claimed in any one of claims 4 to 6.

8. A control method for a transmitter of a visible light communication system according to any one of claims 1 to 3, characterized in that: include: Driving the lighting device to start up to provide lighting light; The actuator is driven to drive the first polarizer to rotate with variable frequency, so as to frequency modulate the illumination light passing through the first polarizer, so that the illumination light carries a communication signal.

9. A control method for a receiving end of a visible light communication system according to any one of claims 4 to 6, characterized in that: include: Driving the demodulation device to demodulate the communication signal carried by the illumination light to generate a communication instruction corresponding to the communication signal; The receiving terminal is controlled according to the communication instruction.

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