Visible light wireless communication system based on radio frequency control lighting source
Technical field
The present invention relates to a kind of visible light wireless communication system, relate in particular to a kind of visible light wireless communication system based on radio frequency control lighting source.
Background technology
In the face of the user increase sharply and people at a high speed, the demand of wideband multimedia communication, electromagnetic available band scope has become more and more limited.Because Radio Spectrum Resource is limited, the current radio frequency wretched insufficiency that can distribute.In addition, radiofrequency signal is harmful, can not unrestrictedly increase transmitting power, have the characteristics such as electromagnetic interference, thereby the electromagnetic communication technology is subject to strict restriction in occasions such as hospitals.Along with the development of all optical access technology and the people requirement to wireless broadband communication, the wireless light communication technology is large because of its information capacity, flexible, easy to maintenance, the safe and secret very big concern that has obtained people of deployment, it provides a kind of flexibly solution for the rapid deployment of WiMAX access, and its range of application is more extensive.
The wireless light communication technology is a kind of wireless access wide band technology, is the product that optical communication technique and wireless communication technology combine, and it carries out light signal by atmosphere as transmission medium and transmit take light signal as carrier.
The current wireless optical communication technique mainly contains following several: free space optical communication (FSO:Free Space Optical Communication), the communication of indoor infrared line and visible light communication (VLC:Visible Light Communication).FSO general using wavelength is the infrared light of 850nm or 1550nm, indoor infrared communication general using LED infrared light, and VLC then utilizes the LED visible light.That white light LEDs has is low in energy consumption, long service life, size are little, environmental protection, particularly its response sensitivity advantages of higher, thereby is usually used in carrying out in the Ultrahigh speed data communication.Yet LED visible light radio communication only can at indoor realization short haul connection, can't satisfy the needs of long haul communication.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, proposes a kind of visible light wireless communication system based on radio frequency control lighting source, and it can reduce and is subjected to electromagnetic interference.
The technical solution adopted for the present invention to solve the technical problems is, a kind of visible light wireless communication system based on radio frequency control lighting source is proposed, it comprises signal reception ﹠ disposal base station, signal transmitting and receiving module and the light signal that is arranged on the portable terminal receives modular converter, and described signal reception ﹠ disposal base station is used for that the information that receives is converted to emission of radio frequency signals and goes out; Described signal transmitting and receiving module is used for receiving the radiofrequency signal of described signal reception ﹠ disposal base station emission, and converts radiofrequency signal to light signal; Described light signal receives modular converter and is used for receiving described light signal, and with the discernible signal of light signal conversion adult.
Further, described signal transmitting and receiving module is provided with the LED for the utilizing emitted light signal.
Further, described signal reception ﹠ disposal base station comprises signal source, microprocessor and radiofrequency launcher, and described signal source is used for providing the signal that needs transmission, and this signal can be from the signal that signals or receive from the outside; Described microprocessor is used for the data that will receive from signal source and forms packet according to the requirement of radiofrequency launcher, and described radiofrequency launcher is used for and will goes out by radio-frequency transmissions from the packet of described microprocessor reception.
Further, described microprocessor is single-chip microcomputer, arm processor, FPGA processor or dsp processor.
Further, described radiofrequency launcher is nRF905.
Further, described radiofrequency launcher is connected with plate and carries loop antenna or monopole type antenna.
Further, described signal transmitting and receiving module comprises radio frequency receiver, LED lamp controller and LED lamp, described radio frequency receiver be used for to receive the radiofrequency signal of signal reception ﹠ disposal base station emission, and described LED lamp controller is used for modulating the signal of described radio frequency receiver output and according to the light and shade of the described LED lamp of this signal controlling.
Further, described radio frequency receiver is nRF905.
Further, described light signal receives modular converter and comprises photodetector, signal amplification module and signal conversion module, the light signal that described photodetector is used for described signal transmitting and receiving module is launched converts the signal of telecommunication to, described signal amplification module is used for the signal of telecommunication of described photodetector output is amplified, and described signal conversion module is used for the discernible signal of signal of telecommunication conversion adult with described signal amplification module output.
Further, the discernible signal of people of described signal conversion module output is image, sound, literal or color.
In sum, the present invention is by utilizing radio frequency control lighting source, radio communication and visible light radio communication are combined, give full play to radio communication and visible light radio communication advantage separately, thereby compare with radio communication, can reduce being subjected to electromagnetic interference, can be applicable to the occasion that electromagnetic wave is had strict demand.
Description of drawings
Fig. 1 is the theory diagram that the present invention is based on the visible light wireless communication system of radio frequency control lighting source.
Fig. 2 is the theory diagram of the signal reception ﹠ disposal base station of an embodiment of the present invention shown in Figure 1.
Fig. 3 is the theory diagram of the signal transmitting and receiving module of an embodiment of the present invention shown in Figure 1.
Fig. 4 is the theory diagram that the light signal of an embodiment of the present invention shown in Figure 1 receives modular converter.
Embodiment
The present invention will be further described below in conjunction with drawings and the specific embodiments:
See also Fig. 1 and Fig. 2, the visible light wireless communication system that the present invention is based on radio frequency control lighting source comprises signal reception ﹠ disposal base station 1, signal transmitting and receiving module 2 and the light signal that is arranged on the portable terminal receives modular converter 3.Described signal reception ﹠ disposal base station 1 is used for that the information that receives is converted to emission of radio frequency signals and goes out, it comprises signal source 11, microprocessor 12 and radiofrequency launcher 13, described signal source 11 is used for providing the signal that needs transmission, in the present embodiment, described signal source is computer, thereby is convenient to input information and transmission with the needs transmission.Described microprocessor 12 is used for the data that will receive from signal source 11 and forms packet according to the requirement of radiofrequency launcher 13, namely to the processing of packing of the data of signal source 11 outputs.Described radiofrequency launcher 13 is connected with plate and carries loop antenna 14, and described radiofrequency launcher 13 is used for converting to from the packet that described microprocessor 12 receives radiofrequency signal and carries loop antenna 14 by described plate and launch.
See also Fig. 1 and Fig. 3, described signal transmitting and receiving module 2 is used for receiving the radiofrequency signal of described signal reception ﹠ disposal base station 1 emission, and convert radiofrequency signal to light signal, it comprises radio frequency receiver 21, LED lamp controller 22 and LED lamp 23, described radio frequency receiver 21 is used for the radiofrequency signal of radiofrequency launcher 13 emissions of reception signal reception ﹠ disposal base station 1, and described radio frequency receiver 21 is connected with plate and carries loop antenna 24.Described LED lamp controller 22 is used for modulating the signal of described radio frequency receiver 21 outputs, and according to the light and shade of the described LED lamp 23 of this signal controlling, be described LED lamp controller 22 by sending high-frequency square wave control signal to described LED lamp 23, the high speed light and shade blinking light that described LED lamp 23 is sent be invisible to the naked eye.
In the present embodiment, described microprocessor 12 and LED lamp controller 22 are the AT89LV5 single-chip microcomputer, described radiofrequency launcher 13 and radio frequency receiver 21 are nRF905, nRF905 is comprised of fully-integrated frequency synthesizer, receiver, power amplifier, crystal oscillator and modulator with demodulation, need not add Surface Acoustic Wave Filter, just can obtain stable operating frequency, himself possesses Shock Burst mode of operation, can automatically produce lead code and CRC (CRC), and use SPI interface and single chip communication, configure very convenient.In addition, its power consumption is very low, and during with the power output emission of-10dB mW, electric current only has 11mA, and the electric current when working in receiving mode is 12.5mA, and built-in idle pulley and shutdown mode are easy to realize energy-conservation.Because nRF905 is 3.3V low voltage power supply device, therefore described microprocessor 12 and LED lamp controller 22 also will adopt the AT89LV5 single-chip microcomputer of low voltage power supply, and the low voltage chip that employing can be worked under 3.3V voltage has saved the circuit of interface level conversion, thereby simple in structure, cost is low.By starting Power Supply Monitoring and the watchdog circuit of microprocessor 12 inside, in order to increase substantially the interference free performance of whole circuit, working stability is reliable.In addition, the described antenna that transmits and receives radiofrequency signal is plate and carries loop antenna, thereby cost performance is higher.
See also Fig. 1 and Fig. 4, described light signal receives modular converter 3 and is used for receiving described light signal, and with the discernible signal of light signal conversion adult, it comprises photodetector 31, signal amplification module 32 and signal conversion module 33, the light signal that described photodetector 31 is used for described signal transmitting and receiving module 2 is launched converts the signal of telecommunication to, described signal amplification module 32 is used for the signal of telecommunication of described photodetector 31 outputs is amplified, and described signal conversion module 33 is used for the discernible signal of signal of telecommunication conversion adult with described signal amplification module 32 outputs.The discernible signal of people of described signal conversion module 33 outputs can be image, sound, literal or color etc.Described signal conversion module 33 is prior art, does not repeat them here.
When the present invention is applied in the communication system of informing information in the hospital, can by manually management scenario being inputted described signal source 11, just described management scenario information can be sent to described portable terminal.The control measures that the corresponding needs of the different passenger flow situation number of degrees of reply that described management scenario refers to formulate for hospital are taked, control measures are decided to be several controlled state number of degrees successively by the size of the reply volume of the flow of passengers, the sequence number of the sequence number of controlled state number of degrees and passenger flow situation number of degrees is corresponding equity, and according to the employing of automatically checking the number of current passenger flow situation grade.
Each section office are when different controlled state number of degrees, by report corresponding indication and guiding advice as the mobile phone that enters hospital personnel, large LED outdoor display screen, passenger flow indicator light, the loudspeaker of portable terminal.Indication is the saturation prediction that shows each section office, is represented respectively normally, crowds, is had a full house by three colors; Guiding is advised and to be referred to that transmitting corresponding pattern, literal, color by described mobile phone, large LED outdoor display screen, passenger flow indicator light, loudspeaker carries out suggestion, prompting and warning.The present invention is applied in is convenient to the personnel of seeing a doctor according to the time to diagnose the illness of informing information adjustment oneself and the doctor understanding to the number of seeing a doctor in the hospital.By radio communication is combined with the visible light radio communication, thereby can avoid radiofrequency signal may disturb the situation of the signal in the vital equipment.
In sum, the present invention is by utilizing radio frequency control lighting source, radio communication and visible light radio communication are combined, give full play to radio communication and visible light radio communication advantage separately, thereby compare with radio communication, can reduce being subjected to electromagnetic interference, can be applicable to the occasion that electromagnetic wave is had strict demand.
The above is described preferred embodiment of the present invention by reference to the accompanying drawings; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.