Communication equipment based on visible light and short-distance fusion

Abstract

The invention provides a communication device based on visible light and short-distance fusion, the communication device is provided with an electromagnetic signal communication module, an electromagnetic induction module and a visible light signal communication module, the electromagnetic signal communication module is used for sending an electromagnetic signal carrying communication device authentication information, receiving and analyzing electromagnetic signals sent by other communication equipment to obtain authentication information of the other communication equipment; the electromagnetic induction module is used for generating a variable magnetic field, inducing variable magnetic fields generated by other communication equipment to generate induction current, and determining whether the distance between the two pieces of communication equipment meets a distance transmission condition or not based on the generated induction current; and the visible light signal communication module is used for generating and sending a visible light signal carrying data, and receiving and analyzing visible light signals sent by other communication equipment to obtain the data sent by the other communication equipment.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, in particular to the field of wireless short-range communications technology, and more particularly to a communication device based on visible light and short-range fusion. Background Art

[0002] Short-range communication technology plays a crucial role in modern digital life and industrial production, and is widely used in consumer electronics, smart homes, industrial manufacturing, smart transportation, and many other fields. Whether it's data exchange between everyday mobile phones and computers, the interconnection of smart home appliances, or the collaborative operation of equipment on industrial production lines, short-range communication technology is essential. It provides the foundation for data transmission and information exchange between various devices.

[0003] Existing short-range communication technologies are mainly divided into two categories: wired and wireless. Wired communication is represented by data interfaces and cables such as USB / Type-C. With its high-speed and stable data transmission capabilities, it can quickly transfer large-capacity files and supports hot plugging. It is widely compatible with various devices such as computers and mobile phones. The Type-C interface also has a two-way charging function. Among wireless communication technologies, NFC and RFID have a shorter transmission distance of about 10cm-1m. NFC is highly secure and suitable for mobile payments, while RFID is mostly used for object identification and tracking. Bluetooth, WiFi, and Star Flash technologies have transmission distances ranging from 10m to 100m, and the transmission rate covers a wide range. Bluetooth is often used for peripheral device connections, while WiFi is used for network access. Star Flash is a new generation of innovative wireless connection technology. However, these short-range communication technologies all have certain limitations. Wired communication requires reserved interfaces on devices, places higher demands on device size design, and users need to carry data cables, making it inconvenient to use. NFC and RFID have low transmission rates, supporting only hundreds of kbps, and the air interface performance cannot meet high-speed transmission requirements. Bluetooth, WiFi, and Star Flash have the risk of information leakage when transmitting in open spaces. Wireless spectrum resources are in short supply, and systems are prone to mutual interference, which can even lead to communication interruption under strong interference.

[0004] In summary, existing short-range communication technologies have many shortcomings in terms of convenience, transmission rate, security, resource utilization and anti-interference ability. Wired technology is limited by physical connection, and wireless technology faces multiple technical bottlenecks such as speed, security, resources and interference. It is difficult to meet the growing demand for diversified and high-quality data transmission. Therefore, a communication method with high transmission efficiency and guaranteed communication security is urgently needed.

[0005] It should be noted that this background information is provided solely to introduce relevant information of the present invention to facilitate understanding of the technical solution of the present invention. It does not necessarily constitute prior art. In the absence of evidence demonstrating that the relevant information was disclosed prior to the filing date of the present invention, the relevant information should not be considered prior art. Summary of the Invention

[0006] Therefore, the purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a communication device based on visible light and short-range fusion.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] According to a first aspect of the present invention, a communication device based on the fusion of visible light and short distance is proposed, wherein the communication device is configured with an electromagnetic signal communication module, an electromagnetic induction module and a visible light signal communication module, wherein: the electromagnetic signal communication module is used to send electromagnetic signals carrying authentication information of the communication device, and receive and parse electromagnetic signals sent by other communication devices to obtain authentication information of other communication devices; the electromagnetic induction module is used to generate a changing magnetic field, and sense the changing magnetic field generated by other communication devices to generate an induced current, and determine whether the distance between the two communication devices meets the distance transmission condition based on the generated induced current; the visible light signal communication module is used to generate and send visible light signals carrying data, and receive and parse visible light signals sent by other communication devices to obtain data sent by other communication devices.

[0009] Preferably, the electromagnetic signal communication module is a communication module implemented using any one of WiFi, Star Flash and Bluetooth communication methods.

[0010] Preferably, the electromagnetic signal communication module includes at least one electromagnetic signal generating unit and one electromagnetic signal receiving unit, wherein the electromagnetic signal generating unit is used to generate and send electromagnetic signals carrying authentication information of the communication device, and the electromagnetic signal receiving unit is used to receive and analyze electromagnetic signals sent by other communication devices to obtain authentication information of other communication devices.

[0011] Preferably, the electromagnetic induction module is configured with at least one magnetic field generating unit and one magnetic field sensing unit, wherein the magnetic field generating unit is used to generate a changing magnetic field, and the magnetic field sensing unit is used to sense the changing magnetic field generated by other communication devices to generate an induced current, and determine whether the distance between the two communication devices meets the distance transmission condition based on the magnitude of the generated induced current.

[0012] Preferably, the visible light signal communication module includes at least a visible light signal generating unit and a visible light signal demodulating unit, wherein the visible light signal generating unit is used to generate and send visible light signals carrying data, and the visible light signal demodulating unit is used to receive and demodulate visible light signals sent by other communication devices to obtain data sent by other communication devices.

[0013] Preferably, the visible light signal generating unit is configured with an LED light source, and the visible light signal generating unit is configured to: based on the data to be transmitted, use any one of on-off keying, differential pulse position modulation, color shift keying and orthogonal frequency division multiplexing to control the LED light source to convert the data into a corresponding visible light signal.

[0014] According to a second aspect of the present invention, a data sending method based on the communication device according to any one of the first aspects of the present invention is proposed, and the sending method includes: in response to a data sending demand, the sender performs the following steps to send data to the receiver: step S1, sending an electromagnetic signal containing its own authentication information to the receiver, and upon receiving the identity authentication success information returned by the receiver, performing identity authentication on the receiver; step S2, when receiving the identity authentication success information returned by the receiver, sending an electromagnetic induction signal containing distance sensing request information to the receiver so as to perform electromagnetic induction with the receiver to generate an induced current, and when the induced current is less than or equal to a preset current threshold, sending a randomly generated visible light signal to the receiver and testing the data transmission rate; step S3, when the data transmission rate is greater than or equal to the preset rate threshold, sending a visible light signal carrying data information to the receiver.

[0015] Preferably, in step S2, the preset current threshold is 100 mA.

[0016] Preferably, in step S3, the preset rate threshold is 1 Mb / s.

[0017] According to a third aspect of the present invention, a data receiving method based on the communication device according to any one of the first aspects of the present invention is proposed, and the sending method includes: in response to a data receiving demand, the receiving party performs the following steps to receive data sent by the sender: step T1, in response to the electromagnetic signal containing authentication information sent by the sender, the sender is authenticated, and when the authentication is successful, an electromagnetic signal carrying its own authentication information and identity authentication success information is sent to the sender; step T2, when the electromagnetic induction signal sent by the sender is received, a changing magnetic field is generated so that the sender can perform electromagnetic induction; step T3, a randomly generated visible light signal is received from the sender so that the sender can test the data transmission rate; step T4, the visible light signal carrying data information sent by the sender is received and parsed to obtain the data sent by the sender.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The present invention improves existing communication equipment and designs a communication device that can transmit data securely and efficiently by integrating visible light and short-range communication technologies. In addition, the present invention proposes a communication scheme based on the communication device. The scheme first realizes communication authentication through wireless short-range communication and realizes transmission distance judgment by electromagnetic induction technology, and then realizes large-capacity data transmission by visible light communication technology, providing a secure and efficient solution for large-capacity data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0021] Figure 1 Schematic diagram of a communication device based on visible light and short-range fusion according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the locations of a sending device and a receiving device according to an embodiment of the present invention;

[0023] Figure 3 The figure is a schematic diagram of a communication method of a communication device based on visible light and short-range fusion according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] As mentioned in the background technology section, existing short-range communication technologies have many shortcomings in terms of convenience, transmission rate, security, resource utilization and anti-interference ability. Wired technology is limited by physical connections, and wireless technology faces multiple technical bottlenecks such as speed, security, resources and interference, making it difficult to meet the growing demand for diversified and high-quality data transmission.

[0026] To solve the above problems, the present invention proposes a design scheme for a communication device based on the fusion of visible light and short-range communication. This scheme improves the existing communication equipment and integrates visible light and short-range communication to design a communication device that can transmit data securely and efficiently. Furthermore, the present invention proposes a communication scheme based on the improved communication device. This scheme first realizes communication authentication through wireless short-range communication and realizes transmission distance judgment through electromagnetic induction technology, and then realizes large-capacity data transmission through visible light communication technology.

[0027] According to one embodiment of the present invention, the present invention proposes a design scheme for a communication device based on visible light and short-range fusion. In this scheme, an electromagnetic signal communication module, an electromagnetic induction module and a visible light signal communication module are configured in the communication device. Figure 1 The electromagnetic signal communication module is used to send electromagnetic signals carrying authentication information of the communication device, and to receive and analyze electromagnetic signals sent by other communication devices to obtain authentication information of other communication devices; the electromagnetic induction module is used to generate a changing magnetic field, and to sense the changing magnetic field generated by other communication devices to generate an induced current, and to determine whether the distance between the two communication devices meets the distance transmission condition based on the generated induced current; the visible light signal communication module is used to generate and send visible light signals carrying data, and to receive and analyze visible light signals sent by other communication devices to obtain data sent by other communication devices. It should be understood that the present invention does not limit the number of electromagnetic signal communication modules, electromagnetic induction modules and visible light signal communication modules in each communication device.

[0028] According to one embodiment of the present invention, the electromagnetic signal communication module in the present invention is a communication module implemented by any one of WiFi, Star Flash and Bluetooth. It should be understood that the three electromagnetic signal short-distance communication methods listed above are only illustrative and not exhaustive. Other short-distance communication methods using electromagnetic signals as transmission carriers can also be used to implement the electromagnetic signal communication module of the present invention.

[0029] According to one embodiment of the present invention, the electromagnetic signal communication module in the present invention includes at least one electromagnetic signal generating unit and one electromagnetic signal receiving unit, wherein the electromagnetic signal generating unit is used to generate and send electromagnetic signals carrying authentication information of the communication device, and the electromagnetic signal receiving unit is used to receive and analyze electromagnetic signals sent by other communication devices to obtain authentication information of other communication devices.

[0030] According to one embodiment of the present invention, the electromagnetic induction module is configured with at least one magnetic field generating unit and one magnetic field sensing unit. The magnetic field generating unit is used to generate a changing magnetic field, and the magnetic field sensing unit is used to sense the changing magnetic field generated by another communication device to generate an induced current. Based on the magnitude of the generated induced current, the electromagnetic induction module determines whether the distance between the two communication devices meets the distance transmission condition. For communication devices with wireless charging capabilities, the wireless charging module can be functionally configured to implement the functions of the electromagnetic induction module.

[0031] According to one embodiment of the present invention, the visible light signal communication module of the present invention includes at least one visible light signal generating unit and a visible light signal demodulating unit, wherein the visible light signal generating unit is used to generate and send visible light signals carrying data, and the visible light signal demodulating unit is used to receive and demodulate visible light signals sent by other communication devices to obtain data sent by other communication devices. Visible light communication has high-speed transmission capabilities. Compared with traditional wireless communication technologies, such as WiFi or 5G networks, the spectrum resources of visible light signals are more sufficient and can support higher transmission rates, which are more than ten times higher than the currently commonly used wireless communication technologies. In addition, compared with other wireless communication technologies, the signals of visible light communication technology are subject to spatial constraints and will not penetrate non-transparent devices, which can effectively avoid information transmission leakage. Therefore, the use of visible light communication to achieve large-capacity data transmission can reduce the risk of information leakage and hacker attacks, thereby ensuring the security and reliability of information transmission.

[0032] According to one embodiment of the present invention, the visible light signal generating unit is configured with an LED light source, and the visible light signal generating unit is configured to: based on the data to be transmitted, use any one of the coding methods of on-off keying, differential pulse position modulation, color shift keying and orthogonal frequency division multiplexing to control the LED light source to convert the data into a corresponding visible light signal, wherein each coding method is implemented as follows: (1) On-off keying, first directly maps the bit 1 / 0 to the on / off light intensity of the LED. The transmitter only needs to drive the high-speed switch to convert the binary data into a visible light signal, and the receiver parses the visible light signal to obtain the binary data. (2) Differential pulse position modulation, encodes n bits into the time interval between two consecutive narrow pulses. The transmitter only sends one pulse in each symbol period, and the receiver measures the interval between adjacent pulses to decode. (3) Color shift keying, using multi-color LEDs such as RGB, by adjusting the current of each color channel, the light spot in the chromaticity diagram is switched to a preset color point to carry data. The receiver uses a color separation detector to measure the color coordinates and make the nearest point judgment. (4) Orthogonal frequency division multiplexing: Data is first assigned to a set of orthogonal subcarriers. After generating a time domain signal through IFFT (Inverse Fast Fourier Transform), a DC bias is added or the negative half-wave is clipped to ensure the waveform is non-negative before driving the LED. After sampling at the receiving end, the subcarriers are restored through FFT (Fast Fourier Transform) and channel equalization and demodulation are performed. The main components of the visible light signal modulation unit in the present invention are a light detector, an amplifier, a filter, and a signal processing circuit. The received visible light signal is converted into an electrical signal using a decoding method corresponding to the encoding method of the visible light signal modulation unit.

[0033] According to one embodiment of the present invention, the present invention is based on the above-mentioned data transmission method implemented by a communication device based on visible light and short-range fusion. The transmission method includes: in response to a data transmission request, a sender (communication device sending data) performs the following steps to send data to a receiver: Step S1: sending an electromagnetic signal containing its own authentication information to the receiver, and upon receiving a successful identity authentication message returned by the receiver, performing identity authentication on the receiver; Step S2: upon receiving the successful identity authentication message returned by the receiver, sending an electromagnetic induction signal containing distance sensing request information to the receiver to generate an induced current through electromagnetic induction with the receiver, and when the induced current is less than or equal to a preset current threshold, sending a randomly generated visible light signal to the receiver and testing the data transmission rate. Preferably, the preset current threshold is 100 mA; Step S3: when the data transmission rate is greater than or equal to a preset rate threshold, sending a visible light signal carrying data information to the receiver. Preferably, the preset rate threshold is 1 Mb / s. It should be understood that the values ​​of the above-mentioned current threshold and rate threshold are only illustrative and non-exhaustive, and the values ​​of the current threshold and rate threshold can be configured by the implementer according to needs.

[0034] According to one embodiment of the present invention, the present invention is based on the above-mentioned data sending method implemented by a communication device based on visible light and short-range fusion. The sending method includes: in response to data receiving requirements, the receiving party performs the following steps to receive data sent by the sender: step T1, in response to the electromagnetic signal containing authentication information sent by the sender, the sender is authenticated, and when the identity authentication is successful, an electromagnetic signal carrying its own authentication information and identity authentication success information is sent to the sender; step T2, when the electromagnetic induction signal sent by the sender is received, a changing magnetic field is generated so that the sender can perform electromagnetic induction; step T3, the randomly generated visible light signal sent by the sender is received so that the sender can test the data transmission rate; step T4, the visible light signal carrying data information sent by the sender is received and parsed to obtain the data sent by the sender.

[0035] In order to better understand the communication method of the communication device proposed in the present invention, the following is described with reference to the accompanying drawings and examples. Figure 2 First, place two devices A and B that need to communicate together so that the visible light communication module of device A (sender) is aligned with the visible light communication module of device B (receiver), and then enable device A to communicate with device B. The communication steps are as follows: Figure 3Specifically, the communication steps include: Step H1, when device A generates data to be transmitted, it first sends an authentication signal to device B through the electromagnetic signal communication module, and the signal includes a shared key set by the device. In step H2, device B receives the authentication signal sent by device A and authenticates the identity of device A through the shared key. If the authentication is successful, a device authentication success message and the key information of device B are sent to device A. If the authentication fails, an authentication failure message is sent to device A. In step H3, device A receives the information sent by device B. If the received signal is an authentication failure message, or no authentication success message is received within 50ms, the data sending process is stopped and step H1 is re-executed. If the received signal is an authentication success message, the key information of device B is authenticated. If device A successfully authenticates device B, a success feedback signal is sent to device B through the electromagnetic signal communication module and the communication condition authentication link is entered. If device A fails to authenticate device B, a failure feedback signal is sent to device B through the electromagnetic signal communication module and the data sending process is stopped. In step H4, device A and device B detect whether the communication distance and relative position meet the transmission conditions through the built-in electromagnetic induction module to perform communication condition authentication. Specifically, device B generates a changing magnetic field through current excitation. Device A senses this changing magnetic field and generates an induced current. Device A samples the generated induced current in real time and compares it with a preset threshold. If the average value of the sampled induced current is greater than or equal to 15mA for 100ms, devices A and B perform a visible light communication test. Otherwise, a communication failure signal is fed back. The visible light communication test is as follows: Devices A and B transmit random signals through their visible light communication modules and detect the real-time data transmission rate every 1ms. The average data transmission rate over 100ms is calculated. If the average transmission rate reaches 1Mb / s, it indicates that devices A and B meet the communication conditions, that is, the optical transmitter module of device A is aligned with the optical receiver module of device B. If the transmission rate does not reach 1Mb / s, it indicates that the visible light communication module of device A is not aligned with the visible light communication module of device B. The relative positions of devices A and B need to be adjusted to align the optical transmitter module of device A with the optical receiver module of device B.In step H5, when the induced current is greater than or equal to 15mA and the transmission rate reaches 1Mb / s, the visible light communication module of device A processes the data to be transmitted and modulates the signal on the LED light source. The modulation method includes but is not limited to traditional on-off keying, differential pulse position modulation, color shift keying, and orthogonal frequency division multiplexing. The binary data is quickly encoded into a light signal and the data is transmitted to device B using the visible light band as a carrier. In step H6, the optical communication module of device B receives the visible light signal sent by device A, demodulates the visible light signal using a corresponding demodulation method, recovers the data, and performs data verification. During the data transmission process, devices A and B use the electromagnetic induction module to detect whether the communication distance meets the conditions. Device B provides real-time feedback on the communication environment detection results and the data transmission rate, that is, whether the induced current exceeds the threshold of 15mA and whether the data transmission rate exceeds 1Mb / s. If both conditions are met, device A continues to send data packets; otherwise, a failure signal is fed back and device A terminates the data transmission process. In step H7, after all data transmission is completed, device A terminates the transmission process.

[0036] To sum up, the present invention proposes a design scheme for a communication device based on the fusion of visible light and short-range communication. This scheme improves the existing communication equipment and designs a communication device that can transmit data safely and efficiently by integrating visible light and short-range communication technologies. Furthermore, the present invention proposes a communication scheme based on the communication device. This scheme first realizes communication authentication through wireless short-range communication and realizes transmission distance judgment through electromagnetic induction technology, and then realizes large-capacity data transmission through visible light communication technology, providing a safe and efficient solution for large-capacity data transmission.

[0037] While various embodiments of the present invention have been described above, the above descriptions are intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A communication device based on visible light and short-range fusion, characterized in that: The communication device is configured with an electromagnetic signal communication module, an electromagnetic induction module and a visible light signal communication module, wherein: The electromagnetic signal communication module is used to send electromagnetic signals carrying authentication information of the communication device, and receive and analyze electromagnetic signals sent by other communication devices to obtain authentication information of other communication devices; The electromagnetic induction module is used to generate a changing magnetic field, and to sense the changing magnetic field generated by other communication devices to generate an induced current, and to determine whether the distance between the two communication devices meets the distance transmission condition based on the generated induced current; The visible light signal communication module is used to generate and send visible light signals carrying data, and to receive and analyze visible light signals sent by other communication devices to obtain data sent by other communication devices.

2. The communication device according to claim 1, wherein The electromagnetic signal communication module is a communication module implemented by any one of WiFi, Star Flash and Bluetooth communication methods.

3. The communication device according to claim 2, wherein: The electromagnetic signal communication module includes at least one electromagnetic signal generating unit and one electromagnetic signal receiving unit, wherein the electromagnetic signal generating unit is used to generate and send electromagnetic signals carrying authentication information of the communication device, and the electromagnetic signal receiving unit is used to receive and analyze electromagnetic signals sent by other communication devices to obtain authentication information of other communication devices. The communication device according to claim 1 , wherein: The electromagnetic induction module is configured with at least one magnetic field generating unit and one magnetic field sensing unit, wherein the magnetic field generating unit is used to generate a changing magnetic field, and the magnetic field sensing unit is used to sense the changing magnetic field generated by other communication devices to generate an induced current, and determine whether the distance between the two communication devices meets the distance transmission condition based on the magnitude of the generated induced current. The communication device according to claim 1 , wherein: The visible light signal communication module includes at least a visible light signal generating unit and a visible light signal demodulating unit, wherein the visible light signal generating unit is used to generate and send visible light signals carrying data, and the visible light signal demodulating unit is used to receive and demodulate visible light signals sent by other communication devices to obtain data sent by other communication devices. The communication device according to claim 5 , wherein: The visible light signal generating unit is configured with an LED light source, and the visible light signal generating unit is configured to: based on the data to be transmitted, use any one of on-off keying, differential pulse position modulation, color shift keying and orthogonal frequency division multiplexing to control the LED light source to convert the data into a corresponding visible light signal.

7. A data transmission method based on the communication device according to any one of claims 1 to 6, characterized in that: The sending method includes: in response to a data sending request, a sender performs the following steps to send data to a receiver: Step S1: Send an electromagnetic signal containing its own authentication information to the recipient, and authenticate the recipient upon receiving the identity authentication success information returned by the recipient; Step S2: upon receiving the identity authentication success information returned by the recipient, sending an electromagnetic induction signal containing distance sensing request information to the recipient to generate an induced current through electromagnetic induction with the recipient, and when the induced current is less than or equal to a preset current threshold, sending a randomly generated visible light signal to the recipient and testing the data transmission rate; Step S3: When the data transmission rate is greater than or equal to a preset rate threshold, a visible light signal carrying data information is sent to a receiver.

8. A data receiving method based on the communication device according to any one of claims 7, characterized in that: In step S2, the preset current threshold is 100 mA.

9. The method according to claim 7, characterized in that In step S3, the preset rate threshold is 1 Mb / s.

10. A data receiving method based on the communication device according to any one of claims 1 to 6, characterized in that: The sending method includes: in response to a data receiving request, the receiving party performs the following steps to receive data sent by the sending party: Step T1: In response to the electromagnetic signal containing authentication information sent by the sender, the sender is authenticated, and when the authentication is successful, the sender is sent an electromagnetic signal carrying its own authentication information and authentication success information; Step T2: When receiving the electromagnetic induction signal sent by the sender, a changing magnetic field is generated to facilitate electromagnetic induction by the sender; Step T3: receiving a randomly generated visible light signal sent by the sender so that the sender can test the data transmission rate; Step T4: Receive and analyze the visible light signal carrying data information sent by the sender to obtain the data sent by the sender.

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