CN105245278B - A kind of synchronous reception device of visible light communication subcarrier multiplexing clock - Google Patents
A kind of synchronous reception device of visible light communication subcarrier multiplexing clock Download PDFInfo
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- CN105245278B CN105245278B CN201510705934.XA CN201510705934A CN105245278B CN 105245278 B CN105245278 B CN 105245278B CN 201510705934 A CN201510705934 A CN 201510705934A CN 105245278 B CN105245278 B CN 105245278B
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- reception device
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Abstract
The present invention discloses a kind of synchronous reception device of visible light communication subcarrier multiplexing clock, including the photodetector and demultiplexer being sequentially connected electrically, the demultiplexer has been electrically connected clock generator and decoder, clock generator and the decoder electrical connection, the photodetector is converted to the subcarrier signal of multiplexing for the optical carrier at spontaneous emission in future end, the demultiplexer is used to the subcarrier signal of multiplexing being separated into multiple subcarrier signals, the clock generator is used to subcarrier signal reverting to local clock pulses, the decoder is used to subcarrier signal is carried out to decode and output data.The present invention solves clock marks and is combined together with data, under the influence of amplitude noise, can can not provide enough voltage jumps is used for recovered clock, or the clock recovered is the problem of occur phase jitter, clock is set still to be kept with data and the stability of synchronization as transmitting terminal, the apparatus structure of the present invention is simple, and communication reliability is high.
Description
Technical field
The present invention relates to visible light communication field, and in particular to a kind of visible light communication subcarrier multiplexing clock is synchronously received
Device.
Background technology
LED has good modulated property, can possess LED/light source logical using the flicker of LED high speeds light and shade come transmission information
Letter ability.As communication system, receiving terminal must be consistent with transmitting terminal clock could accurately recover data, and due to visible
Optical communication system only one of which physical channel, it is impossible to individually send clock, therefore need to use in the side of receiving terminal recovered clock
Method.It is to transmit an obvious clock marks to receiving terminal, the time in transmitting terminal in the common methods of receiving terminal recovered clock
Mark is included in packet, and the voltage jump for recovered clock is produced in an encoding process, and receiving terminal is indicated using this
Produce reference signal to drive phaselocked loop, tranmitting data register is recovered by phaselocked loop.But the clock marks are combined one with data
Rise, under the influence of amplitude noise, can not provide enough voltage jumps is used for recovered clock, or phase occurs in the clock recovered
Position shake.
The content of the invention
It is synchronous there is provided a kind of visible light communication subcarrier multiplexing clock present invention aim to address the defect of prior art
Reception device, the technical scheme of use is as follows：
A kind of synchronous reception device of visible light communication subcarrier multiplexing clock, including the photodetector being electrically connected to each other and
Demultiplexer, the demultiplexer has been electrically connected clock generator and decoder, clock generator and the decoder electricity
Connection, the photodetector is converted to the subcarrier signal of multiplexing, the solution for the optical carrier at spontaneous emission in future end
Multiplexer is used to the subcarrier signal of multiplexing being separated into multiple subcarrier signals, and the clock generator is used to believe subcarrier
Local clock pulses number are reverted to, the decoder is used to subcarrier signal is carried out to decode and output data.
In visible light communication subcarrier multiplexing system, transmitting terminal by data and clock synchronously be loaded on multichannel subcarrier
And launched by LED/light source, receiving terminal demultiplexes subcarrier, correction and recovered clock by the device of the present invention.By this hair
Bright device, solves clock marks and is combined together with data, under the influence of amplitude noise, can not provide enough voltage
Saltus step is used for recovered clock, or the clock recovered is the problem of occur phase jitter, clock is still kept and transmitting terminal with data
The same stability of synchronization, and the apparatus structure of the present invention is simple, communication reliability is higher.
Preferably, present invention additionally comprises filtering apparatus, the filtering apparatus is used to filter out the light carrier from transmitting terminal
Veiling glare in signal, improves optical signal signal to noise ratio.
Preferably, the filtering apparatus is optical filter, the free transmission range of the optical filter is 380nm ~ 780nm.
Preferably, the photodetector is electrically connected by bandpass filter with demultiplexer.
Photodetector is converted to optical carrier after the subcarrier signal of multiplexing, and the subcarrier signal of multiplexing is first passed through
Bandpass filter inputs to demultiplexer again, and bandpass filter can further improve signal to noise ratio with decaying dc and noise signal.
Preferably, the bandpass filter is second order or high-order band-pass filterses.
Preferably, the demultiplexer includes more than one multiplier.
Preferably, the multiplier has electrically connected narrow band filter.
Subcarrier signal F0~FnAnd reference signal f0~fnBy multiplier output and frequency and difference frequency signal, then pass through arrowband
Bandpass filter output difference frequency signal S0~Sn, wherein frequency S0= F0-f0, frequency S1 = F1-f1, frequency Sn = Fn-fn, pass through
Reasonable set subcarrier frequency and reference signal frequency so that all difference frequency signals are with frequency, and narrow band filter is unified to be set
Centre frequency can separate multichannel subcarrier.The present invention presets S0For non-modulation carrier signal, clock is inputted to
Output local clock is used as the clock of decoder, f after maker, correction phase0~fnAs reference signal, it can be this that it, which is originated,
Ground reference clock, can also external reference clock.Decoder is to multiple subcarrier signal S1~SnDecoded and export final number
According to DATA.In the present invention, multiplier is by after subcarrier signal frequency reducing, by bandpass filter, to obtain narrower passband and more
High signal to noise ratio.
Preferably, the narrow band filter can only be by the subcarrier signal of a frequency.
Preferably, the clock generator includes the phase shifter and phaselocked loop being electrically connected to each other, the phase shifter is used for
Phase correction is carried out to the signal that demultiplexer is exported, the signal after correction will control phaselocked loop to export local clock, locally
Clock as decoder clock, to multiple subcarrier signal S1~SnDecoded and export final data DATA.
Preferably, the photodetector is photovoltaic type or photoconduction type photodetector.
Compared with prior art, beneficial effects of the present invention：By the device of the present invention, clock marks and data are solved
It is combined together, under the influence of amplitude noise, can not provide enough voltage jumps is used for recovered clock, or the clock recovered
Phase jitter occurs, make clock still kept with data with the stability of synchronization as transmitting terminal, and the present invention apparatus structure
Simply, communication reliability is higher.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is subcarrier signal decoding timing diagram of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Embodiment：As shown in figure 1, a kind of synchronous reception device of visible light communication subcarrier multiplexing clock, including mutually electricity
The photodetector 3 and demultiplexer 5 of connection, the demultiplexer 5 have been electrically connected clock generator 8 and decoder 10,
The clock generator 8 and decoder 10 are electrically connected, and the optical carrier that the photodetector 3 is used for spontaneous emission in future end turns
The subcarrier signal of multiplexing is changed to, the demultiplexer 5 is used to the subcarrier signal of multiplexing being separated into multiple subcarrier signals,
The clock generator 8 is used to subcarrier signal reverting to local clock pulses, and the decoder 10 is used to believe subcarrier
Number decode and output data.
The present embodiment also includes filtering apparatus 2, and the filtering apparatus 2 is used to filter out the optical carrier 1 from transmitting terminal
In veiling glare, improve optical signal signal to noise ratio.
The filtering apparatus 2 is optical filter, and the free transmission range of the optical filter is 380nm ~ 780nm.
The photodetector 3 is electrically connected by bandpass filter 4 with demultiplexer 5.
Photodetector 3 is converted to optical carrier after the subcarrier signal of multiplexing, and the subcarrier signal of multiplexing is first passed through
Cross bandpass filter 4 and input to demultiplexer 5 again, bandpass filter 4 can further improve letter with decaying dc and noise signal
Make an uproar ratio.
The bandpass filter 4 is second order or high-order band-pass filterses.
The demultiplexer 5 includes more than one multiplier 6.
The multiplier 6 has electrically connected narrow band filter 7.
Subcarrier signal F0~FnAnd reference signal f0~fnBy multiplier output and frequency and difference frequency signal, then pass through arrowband
Bandpass filter output difference frequency signal S0~Sn, wherein frequency S0= F0-f0, frequency S1 = F1-f1, frequency Sn = Fn-fn, pass through
Reasonable set subcarrier frequency and reference signal frequency so that all difference frequency signals are with frequency, and narrow band filter is unified to be set
Centre frequency can separate multichannel subcarrier.S is preset in the present embodiment0For non-modulation carrier signal, it is inputted to
Output local clock is used as the clock of decoder, f after clock generator, correction phase0~fnAs reference signal, it is originated can be with
It is local reference clock, can also external reference clock.Decoder is to multiple subcarrier signal S1~SnDecoded and exported most
Whole data DATA.In the present invention, multiplier is by after subcarrier signal frequency reducing, by bandpass filter, to obtain narrower passband
Higher signal to noise ratio.
The narrow band filter 7 can only be by the subcarrier signal of a frequency.
The clock generator 8 includes the phase shifter 11 and phaselocked loop 12 that are electrically connected to each other, and the phase shifter 11 is used for pair
The signal that demultiplexer 5 is exported carries out phase correction, and the signal after correction will control phaselocked loop 12 to export local clock pulses
9, local clock 9 is decoded to multiple channel subcarrier S1 ~ Sn as the clock of decoder 10 and exports final data.
The photodetector 3 is Photovoltaic Detectors.
Multichannel subcarrier decodes timing diagram as shown in Fig. 2 reading S in CLOCK rising edges1~SnLevel, phase shifter makes signal
Sequential meets enough retention time hold time, and wherein subcarrier signal low level is defined as 0, and high level is defined as 1.Fig. 2
In as can be seen that S1、S2、SnDecoding data is respectively 0b10101101,0b01001010,0b11001101, can it is parallel or
Serial output, the total transmission bandwidth of system is S1~SnSum.
In visible light communication subcarrier multiplexing system, transmitting terminal by data and clock synchronously be loaded on multichannel subcarrier
And launched by LED/light source, receiving terminal demultiplexes subcarrier, correction and recovered clock by the device of the present invention.By this reality
The device of example is applied, clock marks is solved and is combined together with data, under the influence of amplitude noise, enough electricity can not be provided
Press saltus step be used for recovered clock, or recover clock phase jitter occurs, make clock still kept with data with as transmitting terminal
The stability of synchronization, and the apparatus structure of the present embodiment is simple, and communication reliability is higher.
Claims (10)
1. the synchronous reception device of a kind of visible light communication subcarrier multiplexing clock, it is characterised in that including the light being electrically connected to each other
Electric explorer and demultiplexer, the demultiplexer have been electrically connected clock generator and decoder, the clock generator
With decoder electrical connection, the photodetector is converted to the subcarrier letter of multiplexing for the optical carrier at spontaneous emission in future end
Number, the demultiplexer is used to the subcarrier signal of multiplexing being separated into multiple subcarrier signals, and the clock generator is used for
Subcarrier signal is reverted into local clock pulses, the decoder is used to subcarrier signal is carried out to decode and output data.
2. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 1, it is characterised in that
Also include filtering apparatus, the filtering apparatus is used to filter out veiling glare, improves the optical carrier signal to noise ratio from transmitting terminal.
3. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 2, it is characterised in that
The filtering apparatus is optical filter, and the free transmission range of the optical filter is within 380nm ~ 780nm.
4. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 1, it is characterised in that
The photodetector is electrically connected by bandpass filter with demultiplexer.
5. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 4, it is characterised in that
The bandpass filter is second order or high-order band-pass filterses.
6. a kind of synchronous reception device of visible light communication subcarrier multiplexing clock according to claim 1 or 4, its feature exists
In the demultiplexer includes more than one multiplier.
7. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 6, it is characterised in that
The multiplier has electrically connected narrow band filter.
8. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 7, it is characterised in that
The narrow band filter can only be by the subcarrier signal of a frequency.
9. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 1, it is characterised in that
The clock generator includes the phase shifter and phaselocked loop being electrically connected to each other, and the phase shifter is used for the letter exported to demultiplexer
Number carry out phase correction, after correction signal control phaselocked loop output local clock.
10. a kind of visible light communication subcarrier multiplexing clock synchronization reception device according to claim 1, its feature exists
In the photodetector is photovoltaic type or photoconduction type photodetector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510705934.XA CN105245278B (en) | 2015-10-27 | 2015-10-27 | A kind of synchronous reception device of visible light communication subcarrier multiplexing clock |
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| CN201510705934.XA CN105245278B (en) | 2015-10-27 | 2015-10-27 | A kind of synchronous reception device of visible light communication subcarrier multiplexing clock |
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| CN105245278B true CN105245278B (en) | 2017-08-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999049435A1 (en) * | 1998-03-20 | 1999-09-30 | Versitech Ltd. | CONCURRENT DISPLAY AND DATA COMMUNICATING USING LEDs |
| US6667994B1 (en) * | 2000-06-09 | 2003-12-23 | Scientific-Atlanta, Inc. | Multiplexing digital communication system |
| CN1761321A (en) * | 2004-10-14 | 2006-04-19 | 安捷伦科技有限公司 | Fiber optic connection for digital displays |
| CN102725982A (en) * | 2010-02-05 | 2012-10-10 | 诺基亚西门子通信有限责任两合公司 | Clock recovery method and clock recovery arrangement for coherent polarisation multiplex receivers |
| CN205039822U (en) * | 2015-10-27 | 2016-02-17 | 广东省科技基础条件平台中心 | Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier |
-
2015
- 2015-10-27 CN CN201510705934.XA patent/CN105245278B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999049435A1 (en) * | 1998-03-20 | 1999-09-30 | Versitech Ltd. | CONCURRENT DISPLAY AND DATA COMMUNICATING USING LEDs |
| US6667994B1 (en) * | 2000-06-09 | 2003-12-23 | Scientific-Atlanta, Inc. | Multiplexing digital communication system |
| CN1761321A (en) * | 2004-10-14 | 2006-04-19 | 安捷伦科技有限公司 | Fiber optic connection for digital displays |
| CN102725982A (en) * | 2010-02-05 | 2012-10-10 | 诺基亚西门子通信有限责任两合公司 | Clock recovery method and clock recovery arrangement for coherent polarisation multiplex receivers |
| CN205039822U (en) * | 2015-10-27 | 2016-02-17 | 广东省科技基础条件平台中心 | Multiplexing clock synchronization receiving arrangement of visible light communication subcarrier |
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Inventor after: Zhao Xiaomeng Inventor after: Fang Shaoliang Inventor after: Luo Liang Inventor after: Lu Zhixing Inventor after: Li Qiushi Inventor after: Fang Junbin Inventor before: Zhao Xiaomeng Inventor before: Fang Shaoliang Inventor before: Luo Liang Inventor before: Lu Zhixing |
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