CN112653512B - Ultraviolet light communication device and method - Google Patents
Ultraviolet light communication device and method Download PDFInfo
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- CN112653512B CN112653512B CN202011538000.9A CN202011538000A CN112653512B CN 112653512 B CN112653512 B CN 112653512B CN 202011538000 A CN202011538000 A CN 202011538000A CN 112653512 B CN112653512 B CN 112653512B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an ultraviolet light communication device and an ultraviolet light communication method, wherein the ultraviolet light communication device comprises: the system comprises a control and data processing module, a debugging and transmitting module, a detecting and receiving module, an audio module and a human-computer interface module; the control and data processing module is used for decoding the input digital electric signal from the detection receiving module to obtain output audio data and output instruction data, transmitting the output audio data to the audio module and transmitting the output instruction data to the human-computer interface module; after the input audio data from the audio module and the input instruction data of the human-computer interface module are coded, an output digital electric signal is obtained, and the output digital electric signal is transmitted to the debugging and transmitting module; the detection receiving module is used for converting the input ultraviolet light signal into an input digital electric signal; and the debugging transmitting module is used for converting the output digital electric signal into an output ultraviolet signal.
Description
Technical Field
The invention belongs to the technical field of ultraviolet light communication, and mainly relates to ultraviolet light communication equipment and an ultraviolet light communication method.
Background
At present, the traditional wireless communication technology is easily subjected to reconnaissance and interference, so that the wiretapping or interruption of communication is caused, and reliable communication is difficult to achieve under a special scene. However, in the conventional spatial optical communication process, the accuracy of information transmission can be ensured only by aligning a transmitting party and a receiving party, how to make the strict alignment criterion of the transmitting party and the receiving party is the difficulty of the spatial optical communication technology, but a general communication device is difficult to realize the strict alignment, is difficult to detect weak optical signals, and cannot judge the weak optical signals, so that the optical communication device in the prior art has low capability of judging the transmission signals.
Disclosure of Invention
Technical problem to be solved
The invention can at least partially solve the problem of low accuracy of information transmission caused by low discrimination capability of the optical communication device on the transmission signal in the prior art.
(II) technical scheme
An ultraviolet light communication device comprising: the device comprises a control and data processing module, a debugging and transmitting module, a detection and receiving module, an audio module and a human-computer interface module; the control and data processing module is used for decoding the input digital electric signal from the detection receiving module to obtain output audio data and output instruction data, transmitting the output audio data to the audio module and transmitting the output instruction data to the human-computer interface module; after the input audio data from the audio module and the input instruction data of the human-computer interface module are coded, an output digital electric signal is obtained and transmitted to the debugging and transmitting module; the detection receiving module is in communication connection with the control and data processing module and is used for receiving an input ultraviolet signal from a communication counterpart and converting the input ultraviolet signal into an input digital electric signal; the debugging transmitting module is in communication connection with the control and data processing module and is used for converting the output digital electric signals from the control and data processing module into output ultraviolet signals and transmitting the output ultraviolet signals to a communication counterpart; the audio module is in communication connection with the control and data processing module and is used for acquiring an external input voice signal and converting the input voice signal into input audio data; and the voice conversion module is used for receiving the output audio data from the control and data processing module and converting the output audio data into an output voice signal; and the human-computer interface module is in communication connection with the control and data processing module and is used for performing instruction data interaction with the control and data processing module, and the instruction data comprises output instruction data and input instruction data.
According to an embodiment of the present invention, the debug transmitting module includes: a light source; and the driving chip is in communication connection with the light source and is used for converting the output digital electric signal into an output ultraviolet signal and transmitting the output ultraviolet signal out through the light source.
According to an embodiment of the present invention, the debugging transmission module further comprises: and the collimating lens is arranged on one side of the emergent direction of the light source.
According to an embodiment of the present invention, a probe receiving module includes: the ultraviolet detector is used for receiving an input ultraviolet signal and converting the input ultraviolet signal into an input analog electrical signal; the operational amplifier is in communication connection with the ultraviolet detector and is used for amplifying the input analog electric signal from the ultraviolet detector; an analog-to-digital converter, communicatively coupled to the operational amplifier, for converting the amplified input analog electrical signal to an input digital electrical signal.
According to an embodiment of the present invention, the probe receiving module further includes: and the optical filter is arranged on one side of the receiving direction of the ultraviolet array detector.
According to an embodiment of the present invention, an audio module includes: a vocoder, communicatively coupled to the control and data processing module, for converting input voice signals into input audio data and for converting output audio data into output voice signals; the microphone is in communication connection with the vocoder and is used for collecting input voice signals; the audio operational amplifier is in communication connection with the vocoder and is used for amplifying the output voice signal output by the vocoder; and the loudspeaker is connected with the audio operational amplifier in a communication way and is used for playing and outputting the voice signal.
A method for ultraviolet light communication using the above ultraviolet light communication apparatus, comprising:
receiving an input ultraviolet signal from a communication counterpart through a detection receiving module, converting the input ultraviolet signal into an input digital electric signal, and transmitting the input digital electric signal to a control and data processing module; processing the input digital electric signal through a control and data processing module to obtain counting pulse data, processing the counting pulse data, and determining the optimal synchronous position of the counting pulse data, wherein the counting pulse data comprises a synchronous sequence; generating a local clock according to the optimal synchronization position through a control and data processing module, determining a starting point of a counting time through the local clock, calculating the average pulse number of the symbol "1" in the synchronization sequence in the symbol duration, taking the average pulse number as a discrimination threshold of the pulse number of the symbol "1" in the symbol duration, calculating the average pulse number of the symbol "0" in the synchronization sequence in the symbol duration, and taking the average pulse number as the discrimination threshold of the pulse number of the symbol "0" in the symbol duration; and according to the judgment threshold value of the pulse number of the symbol '1' in the symbol duration and the judgment threshold value of the pulse number of the symbol '0' in the symbol duration, carrying out symbol detection of a channel and decoding the input digital electric signal from the detection receiving module.
According to an embodiment of the present invention, processing the count pulse data, determining an optimal synchronization position where the count pulse of the count pulse data arrives, includes: performing frequency multiplication sampling on the counting pulse data within the symbol duration of the synchronous sequence, and continuously refreshing and calculating the total number of pulses within the latest symbol duration through a frequency multiplication clock; performing correlation calculation on the synchronous sequence and a comparison sequence, and if the result of the correlation calculation is greater than a preset threshold value of the result of the correlation calculation, judging that the position is an initial synchronous position, wherein the comparison sequence is a sequence which is generated according to the total number of pulses in the continuous multiple symbol duration and has the same number with the synchronous sequence symbols; and taking the initial synchronization position as a starting point, and continuously performing correlation calculation within the search length of the given number of symbols to obtain the position with the maximum correlation, and determining the position as the optimal synchronization position.
According to the embodiment of the invention, the control and data processing module processes the input digital electric signal to obtain counting pulse data, and the method comprises the following steps: and performing binarization processing on the input digital electric signal through a control and data processing module to obtain counting pulse data.
According to an embodiment of the present invention, the binarization processing includes: the control and data processing module is used for judging the amplitude of the input digital electric signal through a preset amplitude judgment threshold; if the amplitude of the input digital electric signal is larger than a preset amplitude discrimination threshold, judging the input digital electric signal as counting pulse data; and if the amplitude of the input digital electric signal is smaller than a preset amplitude discrimination threshold, judging the input digital electric signal as clutter data and filtering the clutter data.
(III) advantageous effects
The ultraviolet communication equipment provided by the embodiment of the invention adopts ultraviolet communication, because the ultraviolet wavelength is short, the ultraviolet communication equipment is easy to be strongly scattered by molecules and particles in the atmosphere, and the ultraviolet communication transceiving ends do not need to be aligned strictly like the traditional space optical communication and can also realize effective communication, therefore, the ultraviolet communication equipment can realize communication without establishing a chain and aligning strictly, reduces the use difficulty, can detect optical signals at a photon level, has ultrahigh receiving sensitivity, ensures the accuracy of information transmission of a transmitting party and a receiving party, solves the problems of lower receiving sensitivity of an optical communication device to the transmission signals and lower accuracy of information transmission in the prior art, and realizes voice communication under the condition of non-strict alignment between the equipment. In addition, according to the ultraviolet communication device provided by the embodiment of the invention, the ultraviolet signal reaches the receiving end through atmospheric scattering, the signal generating source is difficult to monitor, compared with the existing microwave wireless communication technology, the device has higher confidentiality and good electromagnetic interference resistance, cannot interfere with other microwave communication devices in the using process, can reliably communicate in a complex electromagnetic environment, and provides a new choice for communication modes in extreme environments and complex electromagnetic environments.
Drawings
Fig. 1 is a block diagram of an ultraviolet light communication device according to an embodiment of the present invention;
fig. 2 is a block diagram of a debug transmitting module according to an embodiment of the present invention;
fig. 3 is a block diagram of a probe receiving module according to an embodiment of the present invention;
fig. 4 is a block diagram of an audio module according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for ultraviolet light communication according to an embodiment of the present invention.
Description of the reference numerals
110. A control and data processing module; 120. debugging a transmitting module; 130. a detection receiving module; 140. an audio module; 150. and a human-machine interface module.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 is a block diagram of an ultraviolet light communication device according to an embodiment of the present invention.
As shown in fig. 1, the ultraviolet light communication apparatus includes: a control and data processing module 110, a debugging transmitting module 120, a detecting receiving module 130, an audio module 140 and a human-machine interface module 150; the respective modules are described as follows:
the control and data processing module 110 is configured to decode the input digital electrical signal from the detection receiving module 130 to obtain output audio data and output instruction data, transmit the output audio data to the audio module 140, and transmit the output instruction data to the human-computer interface module 150; and encoding the input audio data from the audio module 140 and the input instruction data from the human-computer interface module 150 to obtain an output digital electrical signal, and transmitting the output digital electrical signal to the debugging and transmitting module 120.
According to an embodiment of the present invention, the control and data processing module 110 may be selected as: the FPGA processor and the auxiliary circuit thereof; or a DSP processor and its accessory circuits; or a single chip microcomputer and an auxiliary circuit thereof; or other chips and their accompanying circuitry. Specifically, an FPGA processor and an auxiliary circuit thereof can be selected, and the model of the FPGA is selected to be xc7k325tffg676-2 of Xilinx Kintex-7 system. According to the embodiment of the invention, the encoding process and the decoding process of the transmitting end are mutually corresponding, and an interleaving encoding mode can be selected to reduce the error rate.
And a detection receiving module 130, which is in communication connection with the control and data processing module 110, and is used for receiving the input ultraviolet light signal from the communication counterpart and converting the input ultraviolet light signal into an input digital electrical signal.
And the debugging emission module 120, which is in communication connection with the control and data processing module 110, and is configured to convert the output digital electrical signal from the control and data processing module 110 into an output ultraviolet signal and emit the output ultraviolet signal to a communication counterpart.
The audio module 140 is in communication connection with the control and data processing module 110, and is used for acquiring an external input voice signal and converting the input voice signal into input audio data; and for receiving output audio data from the control and data processing module 110 and converting the output audio data into an output voice signal.
And the human-machine interface module 150 is in communication connection with the control and data processing module 110 and is used for performing instruction data interaction with the control and data processing module 110, wherein the instruction data comprises output instruction data and input instruction data.
The ultraviolet communication equipment provided by the embodiment of the invention adopts ultraviolet communication, and because the wavelength of ultraviolet light is short, the ultraviolet light is strongly scattered by each particle in the atmosphere, so that the ultraviolet communication transceiving end does not need to be aligned strictly like the traditional space optical communication, and effective communication can also be realized. Moreover, according to the ultraviolet communication device provided by the embodiment of the invention, the ultraviolet signal reaches the receiving end through atmospheric scattering, the signal generating source is difficult to monitor, compared with the existing microwave wireless communication technology, the high confidentiality is achieved, the good electromagnetic interference resistance is achieved, the device cannot interfere with other microwave communication devices in the using process, reliable communication can be carried out in a complex electromagnetic environment, and a new choice is provided for the communication mode in an extreme environment and the complex electromagnetic environment.
Fig. 2 is a block diagram of a debug transmitting module 120 according to an embodiment of the present invention.
As an alternative embodiment, as shown in fig. 2, the debug transmitting module 120 includes: light source, driver chip, wherein, communication connection between driver chip and the light source, driver chip is used for outputting digital electrical signal conversion and is exported the ultraviolet light signal to will export the ultraviolet light signal and launch away through the light source. The light source is a solar blind band ultraviolet light source device, and can be selected from a laser, an LED, an ultraviolet gas lamp and the like. From the viewpoint of downsizing the apparatus, it is optional to employ a laser diode or an LED array as the light source device.
As an alternative embodiment, the debug transmitting module 120 further comprises: and the collimating lens is arranged on one side of the emergent direction of the light source. The collimating lens is used for converging and collimating the light beams. The collimating lens can be selected as a single lens or a lens array, the output ultraviolet light signal is emitted out according to a certain angle through the collimating lens, and the specific divergence angle is set according to the use environment.
As an example, the debugging emission module uses an ultraviolet LED array as a light source, uses a collimating lens capable of transmitting ultraviolet band to collimate ultraviolet light, uses UC2708 as a driving chip, and directly adjusts data to be sent to the ultraviolet LED array in an OOK manner.
Fig. 3 is a block diagram of a probe receiving module 130 according to an embodiment of the present invention.
As an alternative embodiment, as shown in fig. 3, the probe receiving module 130 includes: the ultraviolet detector is used for receiving an input ultraviolet signal and converting the input ultraviolet signal into an input analog electrical signal; the operational amplifier is in communication connection with the ultraviolet detector and is used for amplifying the input analog electric signal from the ultraviolet detector; and the analog-to-digital converter is in communication connection with the operational amplifier and is used for converting the amplified input analog electric signal into an input digital electric signal.
As an alternative embodiment, the detection receiving module 130 further includes an optical filter disposed on the receiving direction side of the ultraviolet detector for filtering out noise.
As an alternative embodiment, the detection receiving module 130 further includes a lens, which is located between the optical filter and the ultraviolet detector, and is used for converging the light beam onto the photosensitive surface of the ultraviolet detector.
In view of the high sensitivity required of the detection-receiving module 130, the uv detector may be selected to use a photomultiplier tube or an avalanche photodiode responsive to solar blind uv light.
As an example, the optical part of the detection receiving module 130 adopts a solar blind PMT of hamamatsu H10720 or H10721 system as an ultraviolet detector, a solar blind filter which can transmit a corresponding wavelength band is added on one side of the receiving direction of the ultraviolet detector, in addition, the electric part of the detection receiving module 130 realizes amplification of an input analog electric signal of the ultraviolet detector by an amplifying circuit, and an analog-to-digital converter ADC converts the amplified input analog electric signal into an input digital electric signal.
Fig. 4 is a block diagram of an audio module 140 according to an embodiment of the present invention.
As an alternative embodiment, as shown in fig. 4, the audio module 140 includes: a vocoder, communicatively connected to the control and data processing block 110, for converting an input voice signal into input audio data and for converting output audio data into an output voice signal; the microphone is in communication connection with the vocoder and is used for collecting input voice signals; the audio operational amplifier is in communication connection with the vocoder and is used for amplifying the output voice signal output by the vocoder; and the loudspeaker is in communication connection with the audio operational amplifier and is used for playing and outputting the voice signal. The audio module 140 and the control and data processing module 110 may communicate with each other through a serial port. Optionally, the audio operational amplifier amplifies the output voice signal output by the vocoder using, for example, SSM 2211.
An application scenario of the ultraviolet communication device according to the embodiment of the present invention is as follows:
by using the ultraviolet communication equipment, under the condition that the ultraviolet communication equipment of both sides does not need to be aligned strictly, the both sides of the communication use the human-computer interface module 150 to start communication, a user of the equipment selects a corresponding instruction button, the human-computer interface module 150 performs instruction data interaction with the control and data processing module 110 after receiving an instruction of the user of the equipment, and the both sides can use the audio module 140 to collect or play sound under the condition of need; the two communication parties transmit the packed and coded data packet to the communication party through the control and data processing module 110 by the debugging transmitting module 120, or receive information from the communication party by the detection receiving module 130, thereby realizing information transmission between the two communication parties.
Specifically, the following three operation modes can be applied through the human-machine interface module 150:
(1) A voice intercom mode. In this mode, real-time voice communication between the two communicating parties is enabled using the ultraviolet light communication device. The active calling party and the passive calling party use the human-computer interface module 150 to start a voice talkback mode by selecting corresponding instruction buttons, the two parties use the audio module 140 to record voice, and the two communication parties alternately occupy channels in a time division multiplexing mode to transmit voice data.
(2) And a voice recording and playing mode. In this mode, using the ultraviolet light communication device, information can be transmitted cyclically between two communicating parties in a rotating emission manner to each other. The transmitting party uses the human-computer interface module 150 to start the voice recording and broadcasting mode by selecting a corresponding instruction button, the transmitting party records voice through the audio module 140 and circularly sends voice information to the opposite party, and the receiving party can feed back received information to the transmitting party after successfully receiving the voice information and informs the transmitting party of stopping sending the voice information.
(3) One-key shortcut mode. In this mode, both communication parties can quickly transmit a fixed short command signal to each other using the ultraviolet communication apparatus. The two parties start the one-key shortcut mode by selecting the corresponding instruction button using the human-machine interface module 150, and after the human-machine interface module 150 receives the instruction of the device user, the control and data processing module 110 directly transmits the data packet which is well packed and coded to the communication counterpart through the debugging transmission module 120.
An embodiment of the present invention further provides a method for performing ultraviolet light communication by using the above ultraviolet light communication device, fig. 5 is a flowchart of the method for ultraviolet light communication provided in the embodiment of the present invention, and as shown in fig. 5, the method is implemented by operations S501 to S504:
in operation S501, receiving an input ultraviolet signal from a communication partner through a detection receiving module, converting the input ultraviolet signal into an input digital electrical signal, and transmitting the input digital electrical signal to a control and data processing module;
in operation S502, the control and data processing module processes the input digital electrical signal to obtain counting pulse data, and processes the counting pulse data to determine an optimal synchronization position where a counting pulse of the counting pulse data arrives, where the counting pulse data includes a synchronization sequence;
in operation S503, generating a local clock according to the optimal synchronization position through the control and data processing module, determining a starting point of a counting time through the local clock, calculating an average number of pulses of the symbol "1" in the synchronization sequence within the symbol duration, and using the average number of pulses of the symbol "1" in the synchronization sequence as a decision threshold of the number of pulses of the symbol "1" in the symbol duration, and calculating an average number of pulses of the symbol "0" in the synchronization sequence within the symbol duration, and using the average number of pulses of the symbol "0" in the synchronization sequence as a decision threshold of the number of pulses of the symbol "0" in the symbol duration;
in operation S504, symbol detection of a channel is performed according to the decision threshold of the number of pulses of the symbol "1" within the symbol duration and the decision threshold of the number of pulses of the symbol "0" within the symbol duration, and an input digital electrical signal from the probe receiving module is decoded.
As an alternative embodiment, in operation S502, the processing of the count pulse data, and the determining of the optimal synchronization position where the count pulse of the count pulse data arrives includes: performing frequency multiplication sampling on the counting pulse data within the symbol duration of the synchronous sequence, and continuously refreshing and calculating the total number of pulses within the latest symbol duration through a frequency multiplication clock; performing correlation calculation on the synchronous sequence and a comparison sequence, and if the result of the correlation calculation is greater than a preset threshold value of the result of the correlation calculation, judging that the position is an initial synchronous position, wherein the comparison sequence is a sequence which is generated according to the total number of pulses in the continuous multiple symbol duration and has the same number with the synchronous sequence symbols; and taking the initial synchronization position as a starting point, and continuously performing correlation calculation within the search length of the given number of symbols to obtain the position with the maximum correlation, and determining the position as the optimal synchronization position.
As an alternative embodiment, in operation S502, the processing the input digital electrical signal by the control and data processing module to obtain the count pulse data includes: and performing binarization processing on the input digital electric signal through a control and data processing module to obtain counting pulse data.
As an alternative embodiment, the binarization processing includes: the control and data processing module is used for judging the amplitude of the input digital electric signal through a preset amplitude judgment threshold; if the amplitude of the input digital electric signal is larger than a preset amplitude discrimination threshold, judging the input digital electric signal as counting pulse data; and if the amplitude of the input digital electric signal in unit time is smaller than a preset amplitude discrimination threshold, judging the input digital electric signal as clutter data and filtering the clutter data.
It should be noted that the ultraviolet light communication method provided in the embodiment of the present invention may be a communication method implemented based on the ultraviolet light communication device described in fig. 1 to fig. 4, and for specific description of the ultraviolet light communication method provided in the embodiment of the present invention, reference may be made to the description of the ultraviolet light communication device in the above embodiment, and details are not repeated here.
According to the method for ultraviolet light communication provided by the embodiment of the invention, as the synchronous position and the threshold value of each frame of data are changed according to the signal receiving condition of the synchronous sequence, and the judgment of each frame of data has relative real-time performance, more accurate symbol judgment of ultraviolet scattering communication can be realized under the condition of dynamic change of the intensity of the ultraviolet light signal, and the accuracy of data recovery is ensured. In addition, because both communication parties can detect optical signals at a photon level, the ultraviolet light communication method can distinguish the signals under weak signal light, and has higher communication sensitivity and stronger environmental adaptability.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method of ultraviolet light communication using an ultraviolet light communication device, the ultraviolet light communication device comprising: the system comprises a control and data processing module, a debugging and transmitting module, a detecting and receiving module, an audio module and a human-computer interface module; wherein
The control and data processing module is used for decoding the input digital electric signal from the detection receiving module to obtain output audio data and output instruction data, transmitting the output audio data to the audio module and transmitting the output instruction data to the human-computer interface module; after the input audio data from the audio module and the input instruction data of the human-computer interface module are coded, an output digital electric signal is obtained and transmitted to the debugging and transmitting module;
the detection receiving module is in communication connection with the control and data processing module and is used for receiving an input ultraviolet signal from a communication counterpart and converting the input ultraviolet signal into the input digital electric signal;
the debugging emission module is in communication connection with the control and data processing module and is used for converting the output digital electric signal from the control and data processing module into an output ultraviolet signal and emitting the output ultraviolet signal to a communication counterpart;
the audio module is in communication connection with the control and data processing module and is used for acquiring an external input voice signal and converting the input voice signal into the input audio data; and a processing module for receiving said output audio data from said control and data processing module and converting said output audio data into an output speech signal;
the human-computer interface module is in communication connection with the control and data processing module and is used for performing instruction data interaction with the control and data processing module, and the instruction data comprises the output instruction data and the input instruction data;
the method for ultraviolet light communication comprises the following steps:
receiving an input ultraviolet signal from a communication counterpart through the detection receiving module, converting the input ultraviolet signal into an input digital electric signal, and transmitting the input digital electric signal to the control and data processing module;
processing the input digital electric signal through the control and data processing module to obtain counting pulse data, processing the counting pulse data, and determining the optimal synchronous position of the counting pulse data, wherein the counting pulse data comprises a synchronous sequence;
generating a local clock according to the optimal synchronization position through the control and data processing module, determining a counting time starting point through the local clock, calculating the average pulse number of the symbol "1" in the synchronization sequence within the symbol duration, and taking the average pulse number as a judgment threshold of the pulse number of the symbol "1" within the symbol duration, and calculating the average pulse number of the symbol "0" in the synchronization sequence within the symbol duration, and taking the average pulse number as a judgment threshold of the pulse number of the symbol "0" within the symbol duration;
according to the distinguishing threshold value of the pulse number of the symbol '1' in the symbol duration and the distinguishing threshold value of the pulse number of the symbol '0' in the symbol duration, carrying out symbol detection on a channel, and decoding an input digital electric signal from the detection receiving module;
wherein, processing the counting pulse data, and determining the optimal synchronous position of the counting pulse data comprises:
performing frequency multiplication sampling on the counting pulse data within the symbol duration of the synchronous sequence, and continuously refreshing and calculating the total number of pulses within the latest symbol duration through a frequency multiplication clock;
performing correlation calculation on the synchronous sequence and a comparison sequence, and if the correlation calculation result is greater than a preset correlation calculation result threshold value, determining that the position is an initial synchronous position, wherein the comparison sequence is a sequence which is generated according to the total number of pulses in the continuous multiple symbol duration and has the same number of symbols as the synchronous sequence;
and taking the initial synchronization position as a starting point, and continuously performing the correlation calculation within the search length of a given number of symbols to obtain a position with the maximum correlation, and determining the position as the optimal synchronization position.
2. The method for ultraviolet light communication according to claim 1, wherein the commissioning transmitting module comprises:
a light source;
and the driving chip is in communication connection with the light source and is used for converting the output digital electric signal into the output ultraviolet signal and transmitting the output ultraviolet signal out through the light source.
3. The method for ultraviolet light communication according to claim 2, wherein in the ultraviolet light communication device, the commissioning launch module further comprises:
and the collimating lens is arranged on one side of the emergent direction of the light source.
4. The method of claim 1, wherein the detection receiving module comprises:
an ultraviolet detector for receiving the input ultraviolet light signal and converting the input ultraviolet light signal into an input analog electrical signal;
the operational amplifier is in communication connection with the ultraviolet detector and is used for amplifying the input analog electric signal from the ultraviolet detector;
an analog-to-digital converter, communicatively coupled to the operational amplifier, for converting the amplified input analog electrical signal to the input digital electrical signal.
5. The method for ultraviolet light communication according to claim 4, wherein in the ultraviolet light communication device, the detection receiving module further comprises:
and the optical filter is arranged on one side of the receiving direction of the ultraviolet detector.
6. The method of ultraviolet light communication according to claim 1, wherein the audio module comprises:
a vocoder, communicatively coupled to the control and data processing module, for converting the input voice signal to the input audio data and for converting the output audio data to the output voice signal;
the microphone is in communication connection with the vocoder and is used for collecting the input voice signal;
the audio operational amplifier is in communication connection with the vocoder and is used for amplifying an output voice signal output by the vocoder;
and the loudspeaker is communicated with the audio operational amplifier and is used for playing the output voice signal.
7. The method of claim 1, wherein the processing the input digital electrical signal by the control and data processing module to obtain count pulse data comprises:
and carrying out binarization processing on the input digital electric signal through the control and data processing module to obtain counting pulse data.
8. The method for ultraviolet light communication according to claim 7, wherein the binarization processing comprises:
the control and data processing module judges the amplitude of the input digital electric signal through a preset amplitude judgment threshold; if the amplitude of the input digital electric signal is larger than the preset amplitude discrimination threshold, judging the input digital electric signal as the counting pulse data; and if the amplitude of the input digital electric signal is smaller than the preset amplitude discrimination threshold, judging the input digital electric signal as clutter data and filtering the clutter data.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611501A (en) * | 2012-03-21 | 2012-07-25 | 北京邮电大学 | Ultraviolet light communication method and ultraviolet light communication system |
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| CN209448930U (en) * | 2018-10-16 | 2019-09-27 | 常州市巨泰电子有限公司 | Acousto-optic driver and acousto-optic device |
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| CN105515661A (en) * | 2015-12-04 | 2016-04-20 | 武汉邮电科学研究院 | Digital voice communication system and method based on visible light communication technology |
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