CN205039822U - Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier - Google Patents
Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier Download PDFInfo
- Publication number
- CN205039822U CN205039822U CN201520838252.1U CN201520838252U CN205039822U CN 205039822 U CN205039822 U CN 205039822U CN 201520838252 U CN201520838252 U CN 201520838252U CN 205039822 U CN205039822 U CN 205039822U
- Authority
- CN
- China
- Prior art keywords
- clock
- visible light
- light communication
- signal
- subcarrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
The utility model discloses a multiplexing clock synchronization receiving arrangement of visible light communication subcarrier, photoelectric detector and demultiplexer including electricity connection in proper order, demultiplexer electricity has respectively connected clock generator and decoder, clock generator and decoder electricity are connected, photoelectric detector is used for the smooth carrier signal of the end of spontaneous emission in the future to convert multiplexing vice carrier signal into, demultiplexer is used for being a plurality of vice carrier signal with multiplexing vice carrier signal separation, the clock generator is used for reverting to local clock signal with vice carrier signal, the decoder is used for vice carrier signal decode and output data. The utility model provides a clock sign combine together with data, the amplitude noise influence down, can't provide sufficient voltage jump recovered clock, or phase jitter's problem can appear in the clock that resumes, messenger's clock and data still keep the synchronization stability the same with the transmitting terminal, the utility model discloses a device simple structure, communication reliability is high.
Description
Technical field
The utility model relates to visible light communication field, is specifically related to a kind of visible light communication subcarrier multiplexing clock synchronous receiving system.
Background technology
LED have good can modularity, LED high speed light and shade can be utilized to glimmer transmission of information, make LED light source possess communication capacity.As communication system, receiving terminal must be consistent and accurately could recover data with transmitting terminal clock, and only has a physical channel due to visible light communication system, clock cannot be sent separately, therefore needs to adopt the method in receiving terminal recovered clock.Transmit an obvious clock marks to receiving terminal at transmitting terminal in the common methods of receiving terminal recovered clock, this time tag is included in packet, produce the voltage jump being used for recovered clock in an encoding process, receiving terminal utilizes this mark to produce reference signal to drive phase-locked loop, recovers tranmitting data register by phase-locked loop.But this clock marks and data combine, under amplitude noise impact, enough voltage jump can cannot be provided for recovered clock, or the clock recovered there will be phase jitter.
Utility model content
The purpose of this utility model addresses the deficiencies of the prior art, and provide a kind of visible light communication subcarrier multiplexing clock synchronous receiving system, the technical scheme of employing is as follows:
A kind of visible light communication subcarrier multiplexing clock synchronous receiving system, comprise the photodetector and demodulation multiplexer that are electrically connected to each other, described demodulation multiplexer has been electrically connected clock generator and decoder respectively, described clock generator and decoder electrical connection, the optical carrier that described photodetector is used for the end of spontaneous emission is in the future converted to multiplexing subcarrier signal, described demodulation multiplexer is used for multiplexing subcarrier signal to be separated into multiple subcarrier signal, described clock generator is used for subcarrier signal to revert to local clock pulses, described decoder is used for decoding to subcarrier signal and exporting data.
In visible light communication subcarrier multiplexing system, data and clock synchronous to be loaded on multichannel subcarrier and to be launched by LED light source by transmitting terminal, and receiving terminal is by device demultiplexing subcarrier of the present utility model, rectification and recovered clock.By device of the present utility model, solve clock marks and data combine, under amplitude noise impact, enough voltage jump can cannot be provided for recovered clock, or the clock recovered there will be the problem of phase jitter, make the stability of synchronization that clock and data still keep the same with transmitting terminal, and apparatus structure of the present utility model is simple, communication reliability is higher.
As preferably, the utility model also comprises filtering apparatus, and described filtering apparatus is used for filtering from the stray light in the optical carrier of transmitting terminal, improves light signal signal to noise ratio.
As preferably, described filtering apparatus is filter, and the free transmission range of described filter is 380nm ~ 780nm.
As preferably, described photodetector is electrically connected with demodulation multiplexer by band pass filter.
After optical carrier is converted to multiplexing subcarrier signal by photodetector, multiplexing subcarrier signal first inputs to demodulation multiplexer again through band pass filter, and band pass filter can decaying dc and noise signal, improves signal to noise ratio further.
As preferably, described band pass filter is second order or high-order band-pass filters.
As preferably, described demodulation multiplexer comprises more than one multiplier.
As preferably, described multiplier has been electrically connected narrow band filter.
Subcarrier signal F
0~ F
nand reference signal f
0~ f
nexport and frequency and difference frequency signal through multiplier, then export difference frequency signal S by narrow band filter
0~ S
n, its medium frequency S
0=F
0-f
0, frequency S
1=F
1-f
1, frequency S
n=F
n-f
n, by reasonable set subcarrier frequency and reference signal frequency, make all difference frequency signals with frequently, multichannel subcarrier can be separated by narrow band filter unified setting centre frequency.The utility model presets S
0for non-modulation carrier signal, inputed to clock generator, after correcting phase place, exported the clock of local clock as decoder, f
0~ f
nas reference signal, its source can be local reference clock, also can external reference clock.Decoder is to multiple subcarrier signal S
1~ S
ncarry out decoding and export final data DATA.In the utility model, multiplier by after subcarrier signal frequency reducing, by band pass filter, to obtain narrower passband and the signal to noise ratio of Geng Gao.
As preferably, described narrow band filter can only by the subcarrier signal of a frequency.
As preferably, described clock generator comprises the phase shifter and phase-locked loop that are electrically connected to each other, the signal that described phase shifter is used for demodulation multiplexer exports carries out phase place rectification, signal after rectification will control phase-locked loop and export local clock, local clock as the clock of decoder, to multiple subcarrier signal S
1~ S
ncarry out decoding and export final data DATA.
As preferably, described photodetector is photovoltaic type or photoconduction type photodetector.
Compared with prior art, the beneficial effects of the utility model: by device of the present utility model, solve clock marks and data combine, under amplitude noise impact, enough voltage jump can cannot be provided for recovered clock, or the clock recovered there will be phase jitter, makes the stability of synchronization that clock and data still keep the same with transmitting terminal, and apparatus structure of the present utility model is simple, communication reliability is higher.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the utility model subcarrier signal decoding sequential chart.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment: as shown in Figure 1, a kind of visible light communication subcarrier multiplexing clock synchronous receiving system, comprise the photodetector 3 and demodulation multiplexer 5 that are electrically connected to each other, described demodulation multiplexer 5 has been electrically connected clock generator 8 and decoder 10 respectively, described clock generator 8 and decoder 10 are electrically connected, described photodetector 3 is converted to multiplexing subcarrier signal for the optical carrier of spontaneous emission in future end, described demodulation multiplexer 5 is for being separated into multiple subcarrier signal by multiplexing subcarrier signal, described clock generator 8 is for reverting to local clock pulses by subcarrier signal, described decoder 10 is for decoding to subcarrier signal and exporting data.
The present embodiment also comprises filtering apparatus 2, and described filtering apparatus 2 from the stray light in the optical carrier 1 of transmitting terminal, improves light signal signal to noise ratio for filtering.
Described filtering apparatus 2 is filter, and the free transmission range of described filter is 380nm ~ 780nm.
Described photodetector 3 is electrically connected with demodulation multiplexer 5 by band pass filter 4.
After optical carrier is converted to multiplexing subcarrier signal by photodetector 3, multiplexing subcarrier signal first inputs to demodulation multiplexer 5 again through band pass filter 4, and band pass filter 4 can decaying dc and noise signal, improves signal to noise ratio further.
Described band pass filter 4 is second order or high-order band-pass filters.
Described demodulation multiplexer 5 comprises more than one multiplier 6.
Described multiplier 6 has been electrically connected narrow band filter 7.
Subcarrier signal F
0~ F
nand reference signal f
0~ f
nexport and frequency and difference frequency signal through multiplier, then export difference frequency signal S by narrow band filter
0~ S
n, its medium frequency S
0=F
0-f
0, frequency S
1=F
1-f
1, frequency S
n=F
n-f
n, by reasonable set subcarrier frequency and reference signal frequency, make all difference frequency signals with frequently, multichannel subcarrier can be separated by narrow band filter unified setting centre frequency.S is preset in the present embodiment
0for non-modulation carrier signal, inputed to clock generator, after correcting phase place, exported the clock of local clock as decoder, f
0~ f
nas reference signal, its source can be local reference clock, also can external reference clock.Decoder is to multiple subcarrier signal S
1~ S
ncarry out decoding and export final data DATA.In the utility model, multiplier by after subcarrier signal frequency reducing, by band pass filter, to obtain narrower passband and the signal to noise ratio of Geng Gao.
Described narrow band filter 7 can only by the subcarrier signal of a frequency.
Described clock generator 8 comprises the phase shifter 11 and phase-locked loop 12 that are electrically connected to each other, described phase shifter 11 carries out phase place rectification for the signal exported demodulation multiplexer 5, signal after rectification will control phase-locked loop 12 and export local clock pulses 9, local clock 9, as the clock of decoder 10, is decoded to multiple channel subcarrier S1 ~ Sn and exports final data.
Described photodetector 3 is Photovoltaic Detectors.
Multichannel subcarrier decoding sequential chart as shown in Figure 2, reads S at CLOCK rising edge
1~ S
nlevel, phase shifter makes signal sequence meet enough retention time holdtime, and wherein subcarrier signal low level is defined as 0, and high level is defined as 1.Can find out in Fig. 2, S
1, S
2, S
ndecoded data is respectively 0b10101101,0b01001010,0b11001101, can be walked abreast or Serial output, and the total transmission bandwidth of system is S
1~ S
nand.
In visible light communication subcarrier multiplexing system, data and clock synchronous to be loaded on multichannel subcarrier and to be launched by LED light source by transmitting terminal, and receiving terminal is by device demultiplexing subcarrier of the present utility model, rectification and recovered clock.By the device of the present embodiment, solve clock marks and data combine, under amplitude noise impact, enough voltage jump can cannot be provided for recovered clock, or the clock recovered there will be phase jitter, make the stability of synchronization that clock and data still keep the same with transmitting terminal, and the apparatus structure of the present embodiment is simple, communication reliability is higher.
Claims (10)
1. a visible light communication subcarrier multiplexing clock synchronous receiving system, it is characterized in that, comprise the photodetector and demodulation multiplexer that are electrically connected to each other, described demodulation multiplexer has been electrically connected clock generator and decoder respectively, described clock generator and decoder electrical connection, the optical carrier that described photodetector is used for the end of spontaneous emission is in the future converted to multiplexing subcarrier signal, described demodulation multiplexer is used for multiplexing subcarrier signal to be separated into multiple subcarrier signal, described clock generator is used for subcarrier signal to revert to local clock pulses, described decoder is used for decoding to subcarrier signal and exporting data.
2. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 1, is characterized in that, also comprise filtering apparatus, and described filtering apparatus is used for filtering stray light, improves the optical carrier signal to noise ratio from transmitting terminal.
3. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 2, it is characterized in that, described filtering apparatus is filter, and the free transmission range of described filter is within 380nm ~ 780nm.
4. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 1, it is characterized in that, described photodetector is electrically connected with demodulation multiplexer by band pass filter.
5. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 4, it is characterized in that, described band pass filter is second order or high-order band-pass filters.
6. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 1 or 4, it is characterized in that, described demodulation multiplexer comprises more than one multiplier.
7. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 6, it is characterized in that, described multiplier has been electrically connected narrow band filter.
8. a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 7, is characterized in that, described narrow band filter can only by the subcarrier signal of a frequency.
9. according to a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 1, it is characterized in that, described clock generator comprises the phase shifter and phase-locked loop that are electrically connected to each other, the signal that described phase shifter is used for demodulation multiplexer exports carries out phase place rectification, and the signal controlling phase-locked loop after rectification exports local clock.
10., according to a kind of visible light communication subcarrier multiplexing clock synchronous receiving system according to claim 1, it is characterized in that, described photodetector is photovoltaic type or photoconduction type photodetector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520838252.1U CN205039822U (en) | 2015-10-27 | 2015-10-27 | Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520838252.1U CN205039822U (en) | 2015-10-27 | 2015-10-27 | Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205039822U true CN205039822U (en) | 2016-02-17 |
Family
ID=55298689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520838252.1U Withdrawn - After Issue CN205039822U (en) | 2015-10-27 | 2015-10-27 | Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205039822U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245278A (en) * | 2015-10-27 | 2016-01-13 | 广东省科技基础条件平台中心 | Visible light communication subcarrier multiplexing clock synchronization receiving device |
-
2015
- 2015-10-27 CN CN201520838252.1U patent/CN205039822U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245278A (en) * | 2015-10-27 | 2016-01-13 | 广东省科技基础条件平台中心 | Visible light communication subcarrier multiplexing clock synchronization receiving device |
| CN105245278B (en) * | 2015-10-27 | 2017-08-25 | 广东省科技基础条件平台中心 | A kind of synchronous reception device of visible light communication subcarrier multiplexing clock |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101753269B (en) | Information processing apparatus and signal transmission method | |
| CN101729471A (en) | Composite transmission communication method of analogue signal and digital signal of broadcast communication system | |
| CN102255683A (en) | Clock recovery method for high-speed optical time-division multiplexing system | |
| CN101506718A (en) | Mach-Zehnder light modulator, Mach-Zehnder light modulating method, light transmitter, light modulator, light transmitting apparatus, and light receiving apparatus | |
| CN103067697A (en) | Method removing video graphics array (VGA) signal vibration based on optical fiber transmission | |
| CN205039822U (en) | Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier | |
| CN103763090A (en) | Data transmission device and method | |
| CN205179051U (en) | Visible light communication's fast signal restore circuit | |
| CN106303486A (en) | A kind of reception device utilizing Double-strand transmission super large resolution and superelevation frame per second video signal | |
| CN103199981B (en) | A kind of digital synchronization pulse signal picosecond level vibration transmission method | |
| CN105245278A (en) | Visible light communication subcarrier multiplexing clock synchronization receiving device | |
| CN101729195B (en) | Analogue signal and digital information combined transmission communication method | |
| CN108599844A (en) | A kind of synchronous translation apparatus and its working method based on visible light communication technology | |
| CN2751314Y (en) | Digital video-audio optical fiber transmission system | |
| CN206149419U (en) | Utilize twisted -pair transmission super large resolution ratio and superelevation frame per second video signal's receiving arrangement | |
| CN201479127U (en) | Energy extraction and data clock recovery device for active balise | |
| CN105703828A (en) | Infrared laser communication system | |
| CN86105925A (en) | Big capacity channels is digital signal group's transmission method and receiving system on the satellite transmits channel especially | |
| CN202406095U (en) | High-speed parallel interface circuit | |
| CN106027442B (en) | Modem based on scattered pilot | |
| CN202261374U (en) | High-efficiency synchronous demodulation device based on QPSK (Quadrature Phase Shift Keying) | |
| CN204945791U (en) | A kind of single rotor wing unmanned aerial vehicle flight control system | |
| CN103401747A (en) | Distributed floating controller local area network communication system | |
| CN114126129A (en) | Visible light communication fused smart city street lamp system | |
| CN202094873U (en) | Interface structure for serial communication data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160217 Effective date of abandoning: 20170825 |