CN108039910A - A kind of visible light communication equipment transmitting modulating performance measuring device and method - Google Patents
A kind of visible light communication equipment transmitting modulating performance measuring device and method Download PDFInfo
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- CN108039910A CN108039910A CN201711436486.3A CN201711436486A CN108039910A CN 108039910 A CN108039910 A CN 108039910A CN 201711436486 A CN201711436486 A CN 201711436486A CN 108039910 A CN108039910 A CN 108039910A
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
-
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
-
- 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
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
Abstract
The invention discloses a kind of visible light communication equipment transmitting modulating performance measuring device and method, the device to include：Equipment positioning fixture, illumination multistage attenuation module, single shaft mobile module, modulating performance analysis module, control and data transmission module and cabinet.The described method includes：Adjusting makes light signal receiving be in normal operating conditions, controls VLC light sources to be measured to send flashlight, and frequency sweep obtains amplitude versus frequency characte figure, calculates modulation bandwidth, and inband flatness is analyzed in assigned frequency band.The measurement of visible light communication equipment modulation bandwidth and inband flatness is the method achieve, can be adapted for the modulating performance evaluation of various visible light communication equipment, applicability is good.
Description
Technical field
The invention belongs to visible light communication detection technique field, more particularly to a kind of visible light communication equipment transmitting modularity
Can measuring device and method.
Background technology
The modulation bandwidth of light source and inband flatness used in visible light communication equipment are two weights in visible light communication field
Index is wanted, the quality of these indexs is for visible light signal transmission quality, transmission speed important role.
The test of modulation of source performance used in visible light communication equipment, mainly includes two side of test device and test method
Face.Test device such as patent CN107104733A etc., realizes visible light source difference wick modulation, the processing of more data branches
With reception, single visible light source multichannel data transmitting-receiving is realized.Test method such as patent CN107124380A, CN102638319A
Deng, sampled by A/D, then numeric field to signal carry out variable-frequency filtering, conversion, using channel gain compensation and phase compensation
Measurement data measurement is obtained after processing and measurement filter filtering.
Above-mentioned specific Patent Reference and pertinent literature are：
1), " a kind of data transmission method for uplink based on visible light communication, apparatus and system ", patent No. CN107104733A.
The patent provides a kind of more data branch dispensing devices, including serioparallel exchange unit, for the data to be sent progress to acquisition
Serioparallel exchange processing；Modulation unit, for being modulated processing respectively to parallel branch data, obtains modulated signal；Transmitting
Unit, for the modulated signal to be separately input to corresponding wick；Signal receiving unit, for receiving visible light source
The optical signal sent.It is similar to remove part of module, test device of the present invention is also moved comprising illumination multistage attenuation module and single shaft
Module, it can be ensured that brightness value is in normal range of operation at test optical signal receiving device；Control and data transmission module, can
Realize Electronic control test process, human-computer interaction and data display record and storage.
2), " a kind of modulating performance test method of aeronautical satellite binary offset carrier (AltBOC) signal ", the patent No.
CN102638319A.The invention proposes a kind of test method of signal modulation performance, and this method carries out A/D to modulated signal and adopts
Sample, variable-frequency filtering, Hilbert transform, quadrature demodulation, channel gain compensation and phase compensation processing and etc. after measured
Data.Filter to obtain reference data by carrying out measurement data symbol detection, reference signal generation processing and reference filter.
Reference data and measurement data are calculated, you can the parameter and signal graph of reflection baseband modulation performance are obtained, including：Vector
Range error EVM, vector phase error E VP, the spectrogram of error vector, error vector time domain waveform etc..Modularity of the present invention
Energy parameter and above-mentioned difference, are modulation bandwidth and inband flatness, since the size of modulation bandwidth determines that visible light communication is set
The speed of standby signal transmission, and due to the uncertainty of whole test system signal decay, body can not be carried out using range error
Existing modulating performance, therefore select inband flatness to characterize the size of signal different frequency amplitude deviation.
3), " a kind of method and system for improving LED channel widths in visible light communication ", patent No. CN107124380A.
The invention provides a kind of method for improving LED channel widths in visible light communication, the described method includes：The frequency for obtaining LED is rung
Characteristic is answered, according to the frequency response characteristic of the LED of acquisition, the corresponding frequency of frequency response characteristic for obtaining the LED is rung
Answer curve；According to the corresponding frequency response curve of frequency response characteristic of the obtained LED, frequency response characteristic and institute are obtained
State the opposite FIR filters of LED；Pre-equalization process is carried out to the signal to be sent of reading so that in the signal to be sent
Low frequency component is decayed, high fdrequency component enhancing.For bandwidth, the present invention emphatically how tested automatically by algorithm by host computer by description
Go out modulation bandwidth, substitute traditional manual testing, improve testing efficiency.
4), be rather published in the merchant of Guangdong University of Science ＆ Technology 2016 volume 6《Communicate the world》On《In visible light communication
LED frequency characteristic test technique studies》, this article proposes LED frequency characteristic test schemes in visible light communication system, using showing
Ripple device shows that photodetector receives the waveform of the signal after processing, measures amplitude and depicts the amplitude versus frequency characte of LED point by point,
Evaluation index using three dB bandwidth as LED frequency characteristics.The amplitude versus frequency characte figure that the present invention is obtained for test, proposes to be based on declining
Limit A is born in volume reduction0Modulation bandwidth measuring method, realization device according to algorithm and test for decay tolerance the limit difference will
Ask, automatically, quickly and accurately measure modulation bandwidth value.
The content of the invention
To be surveyed in order to solve the above technical problems, the object of the present invention is to provide a kind of visible light communication equipment transmitting modulating performance
Measure device and method.
The purpose of the present invention is realized by following technical solution：
A kind of visible light communication equipment launches modulating performance measuring device, including：The multistage decay of equipment positioning fixture, illumination
Module, single shaft mobile module, modulating performance analysis module, control and data transmission module and cabinet；It is described
Equipment positioning fixture, for fixing VLC light sources and light signal receiving to be measured；
Illumination multistage attenuation module, for controlling light illumination attenuation percentage；
Single shaft mobile module, for the mobile light signal receiving being installed on the bank of modules and VLC light to be measured
Distance between source；
Modulating performance analysis module, for controlling, measuring and analysis measurement data；
Control and data transmission module, for human-computer interaction and data transfer；
Cabinet, for blocking external disturbing rays.
A kind of visible light communication equipment launches modulating performance measuring method, including：
A, illumination E is worked normally according to the VLC device to be measured of inputw, mould is moved by illumination multistage attenuator and single shaft
Block adjusts the position at light signal receiving；
B, the frequency modulating signal on VLC light sources to be measured is loaded, and from compared with small frequency ftlStart to be incremented by side to be segmented equal difference
Formula is until reach measurement upper limiting frequency ftu, then dock received signal progress frequency sweep after treatment and obtain amplitude versus frequency characte
Figure, so as to obtain lower limiting frequency flWith upper cut off frequency fu, according to lower limiting frequency flWith upper cut off frequency fuCalculate modulation band
Wide BWm, centre frequency foWith modulation band Fm；
C, using centre frequency as fo, bandwidth is input value BWfFrequency band FfIt is interior, to frequency band FfInterior point interpolation processing, obtains
FfThe identical 2N of interior each consecutive points frequency intervali+ 1 point, each point amplitude are Ai[1], Ai[2] ... ..., Ai[Ni], Ai[Ni+ 1],
Ai[Ni+ 2] ... ..., Ai[2Ni+ 1], center frequency points amplitude is Ai[Ni+1]；
D, measuring signal inband flatness is drawn according to each point amplitude and center frequency point amplitude, according to inband flatness, meter
Calculation draws inband flatness peak-to-peak value.
Compared with prior art, one or more embodiments of the invention can have the following advantages that：
Test device of the present invention includes illumination multistage attenuation module and single shaft mobile module, it can be ensured that test optical signal connects
Receive brightness value at device and be in normal range of operation；Control is with data transmission module, it can be achieved that Electronic control test process, man-machine
Interaction and data display record and storage.
Modulating performance parameter is modulation bandwidth and inband flatness, since the size of modulation bandwidth determines visible light communication
The speed of device signal transmission, and due to the uncertainty of whole test system signal decay, range error can not be used
Modulating performance is embodied, therefore selects inband flatness to characterize the size of signal different frequency amplitude deviation.
For bandwidth, how description by algorithm tests out modulation bandwidth to the present invention automatically by host computer emphatically, substitutes and passes
The manual testing of system, improves testing efficiency.
The amplitude versus frequency characte figure obtained for test, proposes based on decay tolerance limit A0Modulation bandwidth measuring method, it is real
Existing device is automatic, quickly and accurately measure modulation bandwidth according to different the requiring of algorithm and test for the decay tolerance limit
Value.
Brief description of the drawings
Fig. 1 is the function structure chart of visible light communication equipment transmitting modulating performance measuring device；
Fig. 2 is visible light communication equipment transmitting modulating performance measuring method flow chart；
Fig. 3 is visible light communication equipment transmitting modulation bandwidth and the test flow chart of inband flatness measuring method.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and attached drawing to this hair
It is bright to be described in further detail.
As shown in Figure 1, launch the modular structure of modulating performance measuring device for visible light communication equipment, including：Equipment is determined
Position fixture, illumination multistage attenuation module, single shaft mobile module, modulating performance analysis module, control and data transmission module and machine
Case；The equipment positioning fixture, for fixing VLC light sources and light signal receiving to be measured；Illumination multistage attenuation module, is used for
Control light illumination attenuation percentage；Single shaft mobile module, receives for the mobile optical signal being installed on the bank of modules
Distance between device and VLC light sources to be measured；Modulating performance analysis module, for controlling, measuring and analysis measurement data；Control with
Data transmission module, for human-computer interaction and data transfer；Cabinet, for blocking external disturbing rays.
Described device light propagation path is that the light that the VLC light sources to be measured being installed on light source base are sent vertically shines
It is mapped on multistage attenuator, by the hole on hole and light barrier thereon, is irradiated on light signal receiving, completes optical signal
Transmitting, decay, filtering and reception.
As shown in Fig. 2, the present embodiment additionally provides a kind of visible light communication equipment transmitting modulating performance measuring method, the party
Method includes：
Step 10 works normally illumination E according to the VLC device to be measured of inputw, moved by illumination multistage attenuator and single shaft
Dynamic model block adjusts the position at light signal receiving；
Step 20 loads the frequency modulating signal on VLC light sources to be measured, and from compared with small frequency ftlStart to pass to be segmented equal difference
Increasing mode is until reach measurement upper limiting frequency ftu, then dock received signal progress frequency sweep after treatment and obtain amplitude-frequency spy
Property figure, so as to obtain lower limiting frequency flWith upper cut off frequency fu, according to lower limiting frequency flWith upper cut off frequency fuCalculate modulation
Bandwidth BWm, centre frequency foWith modulation band Fm；
Step 30 is using centre frequency as fo, bandwidth is input value BWfFrequency band FfIt is interior, to frequency band FfInterior point interpolation processing,
Obtain FfThe identical 2N of interior each consecutive points frequency intervali+ 1 point, each point amplitude are Ai[1], Ai[2] ... ..., Ai[Ni], Ai[Ni+
1], Ai[Ni+ 2] ... ..., Ai[2Ni+ 1], center frequency points amplitude is Ai[Ni+1]；
Step 40 draws measuring signal inband flatness according to each point amplitude and center frequency point amplitude, according to interior flat
Degree, is calculated inband flatness peak-to-peak value.
As shown in figure 3, visible light communication equipment transmitting modulation bandwidth and the testing process bag of inband flatness measuring method
Include：
Above-mentioned steps 10 specifically include：After each equipment is normally connected and worked, workbench is moved to apart from light source
Distalmost end, while rotating illumination multistage attenuation module makes the hole of transmitance maximum go to highest point, completes workbench and illumination
After the initialization of multistage attenuation module, rotating illumination multistage attenuation module makes highest point attenuator by the descending change of transmitance
Change, until the received light of light signal receiving, detects that brightness value is less than EwWhen, control workbench is to close to be measured
VLC light source directions move, until detecting that brightness value is equal to E at light signal receivingw。
Limit A is tolerated according to input attenuation in above-mentioned steps 200, the N number of point of amplitude versus frequency characte figure frequency f [n] (n=1,
2 ... ..., N) and amplitude A [n] (n=1,2 ... ..., N), modulation bandwidth BW can be calculatedm, centre frequency foWith modulation band Fm,
Including：
Remember ApkFor maximum in A [n], then lower limiting frequency point position nlWith upper cut off frequency point position nuMeet：
It is hereby achieved that lower limiting frequency flWith upper cut off frequency fu：
Calculate modulation bandwidth BWm, centre frequency foWith modulation band Fm：
Above-mentioned steps 40 specifically include：According to Ai[n] (n=1,2 ..., 2Ni+ 1) and centre frequency amplitude Ai[Ni+ 1],
Draw measuring signal inband flatness：
ΔAi[n]=Ai[n]-Ai[Ni+ 1] (n=1,2 ..., 2Ni+1)
According to inband flatness, inband flatness peak-to-peak value is drawn：
Wherein max () represents the maximum in one group of number, and min () represents the minimum value in one group of number.
According to modulation bandwidth BWmWith inband flatness peak-to-peak valueJudge visible light communication equipment transmitting modulating performance
Measurement result.
Although disclosed herein embodiment as above, the content only to facilitate understand the present invention and adopt
Embodiment, is not limited to the present invention.Any those skilled in the art to which this invention pertains, are not departing from this
On the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But the scope of patent protection of the present invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (6)
1. a kind of visible light communication equipment launches modulating performance measuring device, it is characterised in that described device includes：Equipment positions
Fixture, illumination multistage attenuation module, single shaft mobile module, modulating performance analysis module, control and data transmission module and cabinet；
It is described
Equipment positioning fixture, for fixing VLC light sources and light signal receiving to be measured；
Illumination multistage attenuation module, for controlling light illumination attenuation percentage；
Single shaft mobile module, between the mobile light signal receiving being installed on the bank of modules and VLC light sources to be measured
Distance；
Modulating performance analysis module, for controlling, measuring and analysis measurement data；
Control and data transmission module, for human-computer interaction and data transfer；
Cabinet, for blocking external disturbing rays.
2. visible light communication equipment as claimed in claim 1 launches modulating performance measuring device, it is characterised in that described to be measured
VLC light sources are installed on light source base, and the light vertical irradiation that sends of VLC light sources to be measured is on illumination multistage attenuator, and
Source light is irradiated on optical signal receiver by the hole set on illumination multistage attenuator and the hole set on light barrier,
To complete the transmitting of optical signal, decay, filtering and reception.
3. a kind of visible light communication equipment launches modulating performance measuring method, it is characterised in that the described method includes：
A, illumination E is worked normally according to the VLC device to be measured of inputw, adjusted by illumination multistage attenuator and single shaft mobile module
Position at light signal receiving；
B, the frequency modulating signal on VLC light sources to be measured is loaded, and from compared with small frequency ftlStart straight to be segmented equal difference incremental manner
Upper limiting frequency f is measured to reachingtu, then dock received signal progress frequency sweep after treatment and obtain amplitude versus frequency characte figure, from
And obtain lower limiting frequency flWith upper cut off frequency fu, according to lower limiting frequency flWith upper cut off frequency fuCalculate modulation bandwidth BWm、
Centre frequency foWith modulation band Fm；
C, using centre frequency as fo, bandwidth is input value BWfFrequency band FfIt is interior, to frequency band FfInterior point interpolation processing, obtains FfIt is interior
The identical 2N of each consecutive points frequency intervali+ 1 point, each point amplitude are Ai[1], Ai[2] ... ..., Ai[Ni], Ai[Ni+ 1], Ai[Ni
+ 2] ... ..., Ai[2Ni+ 1], center frequency points amplitude is Ai[Ni+1]；
D, measuring signal inband flatness is drawn according to each point amplitude and center frequency point amplitude, according to inband flatness, calculated
Go out inband flatness peak-to-peak value.
4. visible light communication equipment as claimed in claim 3 launches modulating performance measuring method, it is characterised in that the step
In A, workbench is moved to apart from light source distalmost end, while rotating illumination multistage attenuation module turns the hole of transmitance maximum
To highest point, the initialization of workbench and illumination multistage attenuation module is completed, rotating illumination multistage attenuation module makes highest point
Attenuator presses the descending change of transmitance, until the received light of light signal receiving, detects that brightness value is less than EwWhen,
Workbench is controlled to be moved to close to VLC light source directions to be measured, until detecting that brightness value is equal to E at light signal receivingw。
5. visible light communication equipment as claimed in claim 3 launches modulating performance measuring method, it is characterised in that in step B,
Modulation bandwidth BWm, centre frequency foWith modulation band FmCalculating be that limit A is tolerated according to the decay of input0, amplitude versus frequency characte figure N
The frequency f [n] of a point, wherein n=1,2 ... ..., N and amplitude A [n], wherein n=1,2 ... ..., N are calculated, specific bag
Include：
Remember ApkFor maximum in A [n], then lower limiting frequency point position nlWith upper cut off frequency point position nuMeet：
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It is hereby achieved that lower limiting frequency flWith upper cut off frequency fu：
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Calculate modulation bandwidth BWm, centre frequency foWith modulation band Fm：
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6. visible light communication equipment as claimed in claim 3 launches modulating performance measuring method, it is characterised in that the step
In D, according to Ai[n], wherein n=1,2 ... ..., 2Ni+ 1 and centre frequency amplitude Ai[Ni+ 1], draw flat in measuring signal band
The calculation formula of degree：
ΔAi[n]=Ai[n]-Ai[Ni+ 1] (n=1,2 ..., 2Ni+1)
According to inband flatness, inband flatness peak-to-peak value is drawn：
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According to modulation bandwidth BWmWith inband flatness peak-to-peak valueJudge the measurement of visible light communication equipment transmitting modulating performance
As a result.
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| CN201711436486.3A CN108039910B (en) | 2017-12-26 | 2017-12-26 | Method for measuring emission modulation performance of visible light communication equipment |
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| CN201711436486.3A CN108039910B (en) | 2017-12-26 | 2017-12-26 | Method for measuring emission modulation performance of visible light communication equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943779A (en) * | 2019-12-24 | 2020-03-31 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Visible light communication equipment test system |
| CN111565128A (en) * | 2020-04-07 | 2020-08-21 | 中国信息通信研究院 | Synchronous equivalent bandwidth testing method and device |
| CN111917465A (en) * | 2020-06-12 | 2020-11-10 | 中山大学 | Screening method and device for communication and illumination shared LED device |
| CN113467418A (en) * | 2021-06-25 | 2021-10-01 | 河北工业大学 | Method for measuring performance index of control loop |
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| CN111917465B (en) * | 2020-06-12 | 2023-03-31 | 中山大学 | Screening method and device for communication and illumination shared LED device |
| CN113467418A (en) * | 2021-06-25 | 2021-10-01 | 河北工业大学 | Method for measuring performance index of control loop |
| CN113467418B (en) * | 2021-06-25 | 2022-06-28 | 河北工业大学 | Method for measuring performance index of control loop |
| CN114401042A (en) * | 2022-01-19 | 2022-04-26 | 东莞信大融合创新研究院 | Visible light communication device characteristic measurement analysis system |
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