CN102957478B - Radio frequency control lighting light source based visible light wireless communication system - Google Patents

Abstract

The present invention relates to a visible light wireless communication system based on radio frequency control of lighting sources, which includes a signal receiving and processing base station, a signal transceiving module, and an optical signal receiving and converting module arranged on a mobile terminal. The signal receiving and processing base station is used to convert received The information is converted into a radio frequency signal and sent out; the signal transceiver module is used to receive the radio frequency signal transmitted by the signal receiving and processing base station, and convert the radio frequency signal into an optical signal; the optical signal receiving conversion module is used to receive the optical signal signal, and convert the optical signal into a human-recognizable signal. By using radio frequency to control the lighting source, the present invention gives full play to the respective advantages of radio frequency communication and visible light wireless communication, so compared with radio frequency communication, it can reduce electromagnetic interference, and can be applied to occasions with strict requirements on electromagnetic waves.

Description

Visible light wireless communication system based on radio frequency control of lighting source

technical field

The present invention relates to a visible light wireless communication system, in particular to a visible light wireless communication system controlling an illumination light source based on radio frequency.

Background technique

Facing the rapid increase of users and people's demand for high-speed, broadband multimedia communication, the available frequency range of electromagnetic waves has become more and more limited. Due to the limited radio frequency spectrum resources, the currently allocated radio frequencies are seriously insufficient. In addition, radio frequency signals are harmful to the human body, cannot increase the transmission power without limit, and have characteristics such as electromagnetic interference. Therefore, electromagnetic wave communication technology is strictly restricted in hospitals and other occasions. With the development of all-optical access technology and people's requirements for wireless broadband communication, wireless optical communication technology has attracted great attention because of its large information capacity, flexible deployment, convenient maintenance, and security. The rapid deployment of the input provides a flexible solution with a wide range of applications.

Wireless optical communication technology is a broadband wireless access technology, which is the product of the combination of optical communication technology and wireless communication technology. It uses optical signals as the carrier and transmits optical signals through the atmosphere as the transmission medium.

The current wireless optical communication technologies mainly include the following: Free Space Optical Communication (FSO: Free Space Optical Communication), Indoor Infrared Communication and Visible Light Communication (VLC: Visible Light Communication). FSO generally uses infrared light with a wavelength of 850nm or 1550nm, indoor infrared communication generally uses LED infrared light, and VLC uses LED visible light. White light LED has the advantages of low power consumption, long service life, small size, green environmental protection, especially its high response sensitivity, so it is more commonly used in ultra-high-speed data communication. However, LED visible light wireless communication can only realize short-distance communication indoors, and cannot meet the needs of long-distance communication.

Contents of the invention

The technical problem to be solved by the present invention is to propose a visible light wireless communication system based on radio frequency control of the lighting source, which can reduce electromagnetic interference.

The technical solution adopted by the present invention to solve the technical problem is to propose a visible light wireless communication system based on radio frequency control of the lighting source, which includes a signal receiving and processing base station, a signal transmitting and receiving module, and an optical signal receiving and converting module installed on the mobile terminal. The signal receiving and processing base station is used to convert the received information into a radio frequency signal and transmit it; the signal transceiver module is used to receive the radio frequency signal transmitted by the signal receiving and processing base station, and convert the radio frequency signal into an optical signal; The optical signal receiving and converting module is used for receiving the optical signal and converting the optical signal into a signal recognizable by humans.

Further, the signal transceiving module is provided with an LED for emitting light signals.

Further, the signal receiving and processing base station includes a signal source, a microprocessor and a radio frequency transmitter, and the signal source is used to provide a signal to be transmitted, which can be a spontaneous signal or a signal received from the outside; the microprocessor The transmitter is used to compose the data received from the signal source into data packets according to the requirements of the radio frequency transmitter, and the radio frequency transmitter is used to transmit the data packets received from the microprocessor through radio frequency.

Further, the microprocessor is a single-chip microcomputer, ARM processor, FPGA processor or DSP processor.

Further, the radio frequency transmitter is nRF905.

Further, the radio frequency transmitter is connected with a board-mounted loop antenna or a monopole antenna.

Further, the signal transceiving module includes a radio frequency receiver, an LED light controller and an LED light, the radio frequency receiver is used for receiving signals, receiving and processing radio frequency signals transmitted by the base station, and the LED light controller is used for modulating the radio frequency receiver The output signal is used to control the brightness of the LED lamp according to the signal.

Further, the radio frequency receiver is nRF905.

Further, the optical signal receiving and converting module includes a photodetector, a signal amplifying module and a signal converting module, the photodetector is used to convert the optical signal emitted by the signal transceiving module into an electrical signal, and the signal amplifying module It is used to amplify the electrical signal output by the photodetector, and the signal conversion module is used to convert the electrical signal output by the signal amplifying module into a signal recognizable by humans.

Further, the human-identifiable signal output by the signal conversion module is image, sound, text or color.

In summary, the present invention combines radio frequency communication and visible light wireless communication by using radio frequency to control the lighting source, and fully utilizes the respective advantages of radio frequency communication and visible light wireless communication. Therefore, compared with radio frequency communication, it can reduce electromagnetic interference and can It is used in occasions with strict requirements on electromagnetic waves.

Description of drawings

FIG. 1 is a functional block diagram of a visible light wireless communication system based on radio frequency control of an illumination source according to the present invention.

FIG. 2 is a functional block diagram of a signal receiving and processing base station according to an embodiment of the present invention shown in FIG. 1 .

FIG. 3 is a functional block diagram of a signal transceiving module shown in FIG. 1 according to an embodiment of the present invention.

FIG. 4 is a functional block diagram of an optical signal receiving and converting module shown in FIG. 1 according to an embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Please refer to Fig. 1 and Fig. 2, the visible light wireless communication system based on radio frequency control lighting source of the present invention includes a signal receiving and processing base station 1, a signal transceiving module 2 and an optical signal receiving and converting module 3 arranged on a mobile terminal. The signal receiving and processing base station 1 is used to convert the received information into a radio frequency signal and transmit it, and it includes a signal source 11, a microprocessor 12 and a radio frequency transmitter 13, and the signal source 11 is used to provide a signal to be transmitted, In this embodiment, the signal source is a computer, so it is convenient to input and transmit the information to be transmitted. The microprocessor 12 is used to compose the data received from the signal source 11 into data packets according to the requirements of the radio frequency transmitter 13 , that is, to package the data output by the signal source 11 . The radio frequency transmitter 13 is connected with the onboard loop antenna 14 , and the radio frequency transmitter 13 is used to convert the data packet received from the microprocessor 12 into a radio frequency signal and transmit it through the onboard loop antenna 14 .

Please refer to FIG. 1 and FIG. 3, the signal transceiving module 2 is used to receive the radio frequency signal transmitted by the signal receiving and processing base station 1, and convert the radio frequency signal into an optical signal, which includes a radio frequency receiver 21, an LED lamp controller 22 and an LED light 23 , the radio frequency receiver 21 is used for receiving and processing radio frequency signals transmitted by the radio frequency transmitter 13 of the base station 1 , and the radio frequency receiver 21 is connected with a board-mounted loop antenna 24 . The LED light controller 22 is used to modulate the signal output by the radio frequency receiver 21, and control the light and shade of the LED light 23 according to the signal, that is, the LED light controller 22 sends a high signal to the LED light 23 The frequency of the square wave control signal makes the LED lamp 23 send out a high-speed bright and dark flashing light signal invisible to the naked eye.

In this embodiment, the microprocessor 12 and the LED lamp controller 22 are all AT89LV5 single-chip microcomputers, and the radio frequency transmitter 13 and the radio frequency receiver 21 are both nRF905, and the nRF905 is composed of a fully integrated frequency synthesizer with demodulation It is composed of receiver, power amplifier, crystal oscillator and modulator. It can obtain stable working frequency without external SAW filter. It has Shock Burst working mode, which can automatically generate preamble and CRC (cyclic redundancy Code verification), and use the SPI interface to communicate with the microcontroller, the configuration is very convenient. In addition, its power consumption is very low. When transmitting with an output power of -10dB mW, the current is only 11mA, and the current in receiving mode is 12.5mA. The built-in idle mode and shutdown mode are easy to realize energy saving. Since nRF905 is a 3.3V low-voltage power supply device, the microprocessor 12 and the LED lamp controller 22 also need to use the AT89LV5 single-chip microcomputer powered by low voltage, and adopt a low-voltage chip that can work at 3.3V, eliminating the need for an interface. A circuit for level shifting, so the structure is simple and the cost is low. By starting the power supply monitoring and watchdog circuit inside the microprocessor 12, the anti-interference performance of the whole circuit is greatly improved, and the operation is stable and reliable. In addition, the antennas for transmitting and receiving radio frequency signals are all board-mounted loop antennas, so the cost performance is relatively high.

Please refer to Fig. 1 and Fig. 4, described optical signal receiving conversion module 3 is used for receiving described optical signal, and optical signal is converted into the signal that can be recognized by human, and it comprises photodetector 31, signal amplifying module 32 and signal conversion module 33, the photodetector 31 is used to convert the optical signal emitted by the signal transceiving module 2 into an electrical signal, and the signal amplification module 32 is used to amplify the electrical signal output by the photodetector 31, the The signal converting module 33 is used for converting the electrical signal output by the signal amplifying module 32 into a signal recognizable by human beings. The human-identifiable signal output by the signal conversion module 33 may be image, sound, text or color. The signal conversion module 33 is an existing technology, and will not be repeated here.

When the present invention is applied to a communication system for notifying information in a hospital, the management plan information can be transmitted to the mobile terminal by manually inputting the management plan into the signal source 11 . Described management plan refers to the corresponding management measures that need to be taken in response to different passenger flow status grade numbers formulated for the hospital. It is correspondingly equivalent to the serial number of the grade number of the passenger flow status, and is automatically used according to the current passenger flow status grade.

When each department has different levels of management status, it broadcasts corresponding guidance prompts and guidance advice through the mobile phones of personnel entering the hospital as mobile terminals, large outdoor LED display screens, passenger flow indicators, and speakers. Guidance prompt is to display the saturation prediction of each department, and three colors represent normal, crowded, and full; guidance advice refers to the transmission of corresponding patterns, texts, Color advises, hints and warns. The invention is applied in the hospital to facilitate the staff to adjust their own time of seeing a doctor according to the notification information and the doctor's understanding of the number of patients. By combining radio frequency communication with visible light wireless communication, situations where radio frequency signals could interfere with signals in life-critical devices can thus be avoided.

In summary, the present invention combines radio frequency communication and visible light wireless communication by using radio frequency to control the lighting source, and fully utilizes the respective advantages of radio frequency communication and visible light wireless communication. Therefore, compared with radio frequency communication, it can reduce electromagnetic interference and can It is used in occasions with strict requirements on electromagnetic waves.

The preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection of the present invention.

Claims (9)

1. A visible light wireless communication system based on radio frequency control of lighting sources, characterized in that: it includes a signal receiving and processing base station, a signal transceiver module and an optical signal receiving conversion module arranged on a mobile terminal, and the signal receiving and processing base station is used to convert The received information is converted into a radio frequency signal and transmitted; the signal transceiver module is used to receive the radio frequency signal transmitted by the signal receiving and processing base station, and convert the radio frequency signal into an optical signal; the optical signal receiving conversion module is used to receive the Describe the optical signal and convert the optical signal into a signal recognizable by humans; The signal transceiving module includes a radio frequency receiver, an LED lamp controller and an LED lamp, and the radio frequency receiver is used for receiving and processing the radio frequency signal transmitted by the radio frequency transmitter of the base station; The LED light controller is used to modulate the signal output by the radio frequency receiver, and control the light and shade of the LED light according to the signal, which specifically includes: the LED light controller sends a square wave control signal to the LED light, so that The LED lamp emits bright and dark flickering light signals invisible to the naked eye. 2 . The visible light wireless communication system based on radio frequency control of the lighting source according to claim 1 , wherein the signal transceiving module is provided with an LED for emitting light signals. 3 . 3. The visible light wireless communication system based on radio frequency control of lighting sources according to claim 1 or 2, wherein the signal receiving and processing base station includes a signal source, a microprocessor and a radio frequency transmitter, and the signal source is used for Provide a signal that needs to be transmitted, which can be a spontaneous signal or a signal received from the outside; the microprocessor is used to compose the data received from the signal source into a data packet according to the requirements of the radio frequency transmitter, and the radio frequency transmitter is used to convert the data received from the signal source The data packets received by the microprocessor are transmitted through radio frequency. 4. The visible light wireless communication system based on radio frequency control of the lighting source according to claim 3, wherein the microprocessor is a single chip microcomputer, an ARM processor, an FPGA processor or a DSP processor. 5 . The visible light wireless communication system based on radio frequency control of lighting sources according to claim 3 , wherein the radio frequency transmitter is nRF905. 6 . The visible light wireless communication system based on radio frequency control of lighting sources according to claim 3 , wherein the radio frequency transmitter is connected with a board-mounted loop antenna or a monopole antenna. 7 . 7. The visible light wireless communication system based on radio frequency control of illumination light sources according to claim 1, wherein the radio frequency receiver is nRF905. 8. The visible light wireless communication system based on radio frequency control of the lighting source according to claim 1 or 2, wherein the optical signal receiving and converting module includes a photodetector, a signal amplifying module and a signal converting module, and the photodetecting The device is used to convert the optical signal emitted by the signal transceiving module into an electrical signal, the signal amplifying module is used to amplify the electrical signal output by the photodetector, and the signal conversion module is used to convert the signal amplifying module The output electrical signal is converted into a human-recognizable signal. 9. The visible light wireless communication system based on radio frequency control of the lighting source according to claim 1 or 2, wherein the human-recognizable signal output by the signal conversion module is image, sound, text or color.