CN105743573A - Visible light communication device and visible light communication method - Google Patents
Visible light communication device and visible light communication method Download PDFInfo
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Abstract
The invention discloses a visible light communication device and a visible light communication method. The method comprises the following steps. The number of terminals of the coverage of each of the plurality of visible light sources is calculated, and the visible light sources include a first visible light source and a second visible light source. The number of sub-bands of a plurality of sub-bands is determined according to the number of terminals, and the sub-bands comprise a first sub-band and a second sub-band. Allocating a first sub-band to the first visible light source and a second sub-band to the second visible light source according to the number of terminals of the respective coverage areas of the visible light sources, wherein the first sub-band and the second sub-band are different. Bandwidth is allocated to each terminal according to the allocated sub-bands or user requirements. Modulating transmission data on one of the first sub-band and the second sub-band.
Description
Technical field
The present invention relates to a kind of visible light communication equipment and a kind of visible light communication method.
Background technology
Visible light communication (visiblelightcommunication, VLC) is to use visible ray as carrier to carry modulation information.Specifically, can pass through modulation for the visible ray of irradiation position and carry information, so that the electronic equipment being in the coverage of visible ray can from carrying the visible ray of information via modulation to receive information.Light emitting diode (light-emittingdiode, LED) can be used for providing visible ray.Because the original applications of light is irradiation position and visible ray has diffusivity (pervasive), so using visible ray to communicate need not significantly change existing framework.The advantage of VLC is in that: have safe communication port；Relative to other forms communication to interference relative immunity；And do not find to cause electromagnetic failure at present.
Use Mb-ofdm (OrthogonalFrequency-DivisionMultiplexing, OFDM) to carry out modulation light emitting diodes different in VLC system (LED) non-linear distortion to be reduced and transfer rate can be improved.Part VLC technology can accomplish to increase the transfer rate in light source overlapping region, but the transfer rate in other regions is still on the low side.Additionally, due to the frequency response of LED light source and output are limited, the technique effect performing LED drive circuit and receiving terminal circuit optimization (optimization) is limited.Other then have trial to add blue color filter in the receiving end, but these technology improve the cost of receiver module because adding optical filter.On the other hand, wavelength-division multiplex (wavelengthdivisionmultiplexing, WDM) transmission technology needs the rgb light source of costliness and wavelength to select optical filter in the receiving end.
Therefore, the present invention provides VLC device and the VLC method of improvement.
Summary of the invention
The present invention proposes a kind of visible light communication equipment and a kind of visible light communication method.
In an one exemplary embodiment of the present invention, the present invention provides a kind of VLC device, and it at least includes, but is not limited to multiple visible light source and controller.Controller is couple to these visible light sources, the terminal quantity of the respective coverage according to these visible light sources determines the number of sub-bands of multiple sub-band, these sub-bands include the first sub-band and the second sub-band, and these visible light sources include the first visible light source and the second visible light source.First visible light source uses the first sub-band；And second visible light source use the second sub-band, and the first sub-band and the second sub-band differ.Controller receives transmission data, and controller, the first visible light source or the second visible light source will transmit data-modulated on the first sub-band and one of them sub-band of the second sub-band.
In an one exemplary embodiment of the present invention, the present invention provides a kind of visible light communication method, comprising: calculate the terminal quantity of the respective coverage of multiple visible light source, these visible light sources include the first visible light source and the second visible light source；Determine the number of sub-bands of multiple sub-band according to terminal quantity, wherein these sub-bands include the first sub-band and the second sub-band；The terminal quantity of the respective coverage according to these visible light sources, distributes the first sub-band and to the first visible light source and distributes the second sub-band to the second visible light source, and wherein the first sub-band and the second sub-band differ；Assigned bandwidth is carried out to each terminal according to the sub-band distributed or user demand；And data-modulated will be transmitted on the first sub-band and one of them sub-band of the second sub-band.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of visible light communication (VLC) equipment of the present invention one one exemplary embodiment.
Fig. 2 is the schematic diagram of the VLC device of the present invention one one exemplary embodiment.
Fig. 3 is power and the frequency relation figure of the sub-band of the VLC device of Fig. 2 one exemplary embodiment.
Fig. 4 is the schematic diagram of the VLC device of another one exemplary embodiment of the present invention.
Fig. 5 illustrates power and the frequency relation figure of the sub-band of the VLC device of Fig. 4 one exemplary embodiment.
Fig. 6 is the flow chart of steps of the visible light communication method of the present invention one one exemplary embodiment.
Fig. 7 is SNR and the frequency relation figure of the experimental result of the VLC device of the present invention one one exemplary embodiment.
Fig. 8 is data rate increment rate and the number of frequency bands graph of a relation of the experimental result of the VLC device of the present invention one one exemplary embodiment.
Fig. 9 is bit error rate and the number of frequency bands graph of a relation of the experimental result of the VLC device of the present invention one one exemplary embodiment.
Description of reference numerals
100,200,400: visible light communication equipment
110: communicator
120,220,420: controller
122,222,422: terminal computing unit
123,223,423: subband allocation unit
124,224,424: bandwidth allocation element
125,225,425: digital signal processor
126: digital analog converter
128:LED light source
130: terminal
230,430: the one DAC
232,432: the two DAC
234,434: the three DAC
240,440: the first LED light source
242,442: the second LED light source
244,444: the three LED light source
250,450: first terminal
252,452: the second terminal
454: third terminal
456: the four terminals
DATA1: transmission data
SB1: the first sub-band
SB2: the second sub-band
SB3: the three sub-band
S602, S604, S606, S608, S610: step
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the schematic diagram of visible light communication (visiblelightcommunication, the VLC) equipment of the present invention one one exemplary embodiment.Refer to Fig. 1, VLC device 100 includes controller 120 and multiple visible light source, it is seen that radiant such as light emitting diode (light-emittingdiode, LED) light source led 1, LED2 ..., LEDN128.In the present embodiment, controller 120 is via digital analog converter (digital-to-analogconverter, DAC) DAC126 is couple to LED light source 128, and controller 120 receives transmission data DATA1 from communicator 110, communicator 110 can be any kind of server unit known in the art, and transmission data DATA1 is sent to VLC device 100.LED light source 128 can be assigned to use different sub-bands (sub-band) according to terminal (terminal) quantity.For example, the first sub-band is assigned to LED1, and the second sub-band is assigned to LED2.For example, the first sub-band and the second sub-band can be visible frequency band, and the first sub-band and the second sub-band can differ.Controller 120 may be used to the terminal T1 in the coverage according to each LED light source 128, T2 ..., TY130 quantity by transmission data DATA1 modulation (modulate) on the first sub-band and one of them sub-band of the second sub-band.But, in another embodiment, controller 120 can also be used with to transmit data DATA1 modulation on the first sub-band and the second sub-band.In another embodiment, controller 120 may be used to transmission data DATA1 modulation on the first sub-band and the second sub-band.In one embodiment, sub-band can be the visible frequency band mutually not overlapped.
In the present embodiment, controller 120 includes terminal computing unit 122, subband allocation unit 123, bandwidth allocation element 124 and digital signal processor (digitalsignalprocessor, DSP) 125.But, in this one exemplary embodiment, controller 120 is not limited to disclosed element.For example, DSP125 can be replaced processor or circuit.Terminal computing unit 122 is in order to calculate the quantity of terminal T1 in the coverage of each LED light source 128, T2 ..., TY130.Subband allocation unit 123 is in order to carry out determiner number of frequency bands according to terminal quantity.Additionally, in certain embodiments, subband allocation unit 123 also distributes sub-band to each LED light source 128 in order to the quantity of the terminal 130 in the coverage according to each LED light source 128.In the present embodiment, bandwidth allocation element 124 in order to carry out assigned bandwidth to each terminal 130 according to the sub-band distributed by subband allocation unit 123.In certain embodiments, can pass through the quantity of the terminal 130 in the coverage of each LED light source 128 and determine the signal quality (signalquality) (such as, data rate) of each sub-band distributed.
In the present embodiment, controller 120 may also include digital signal processor (DSP) 125.DSP125 in order to according to number of sub-bands and bandwidth by transmission data DATA1 modulation on subbands, can be referred to as modulation function on subbands by transmission data-modulated.In certain embodiments, VLC device 100 can also include being coupled between controller 120 and LED light source 128 multiple digital analog converter DAC1, DAC2 ..., DACN126.Modulated transmission data DATA1 can be converted to the multiple analogue signals for driving LED light source 128 by DAC126.In certain embodiments, the number of sub-bands that the quantity of the DAC126 used determines to subband allocation unit 123 is relevant.Additionally, corresponding to each LED light source 128 in coverage without terminal 130, controller 120 can make each of which DAC126 decommission (disable).In certain embodiments, the quantity of DAC126 can the maximum quantity of determiner frequency band.
In order to further illustrate principles of the invention, below enumerate embodiment and illustrate, and with reference to accompanying drawing.Fig. 2 is the schematic diagram of the VLC device of the present invention one one exemplary embodiment, and Fig. 3 illustrates the power of sub-band of VLC device and the frequency relation figure of Fig. 2 one exemplary embodiment.Refer to Fig. 2 and Fig. 3, in the present embodiment, VLC device 200 is similar to the VLC device 100 of Fig. 1 depicted.Difference between VLC device 200 and VLC device 100 is such as in that, VLC device 200 has the first LED light source (LED1) the 240, second LED light source (LED2) the 242, the 3rd LED light source (LED3) 244.First LED light source the 240, second LED light source 242 and the 3rd LED light source 244 correspond respectively to a DAC230, the 2nd DAC232 and the three DAC234.Because not having terminal to be in the coverage of the 3rd LED light source 244, so the modulation function of the 3rd DAC234 and the three LED light source 244 is arranged in park mode.In this one exemplary embodiment, modulation function can be implemented by the different elements in VLC device 200.In certain embodiments, modulation function can be implemented by the DSP225 in controller 220, and therefore can be arranged in park mode by the modulation function implemented by DSP225.In other embodiments, modulation function may be implemented in first LED light source the 240, second LED light source 242 and the 3rd LED light source 244, and therefore the modulation function in LED light source can be closed (turnoff).In the present embodiment, controller 220 receives transmission data DATA1 to carry out (enable) VLC transmission multi-band OFDM (OrthogonalFrequency-DivisionMultiplexing) framework (framework) from communicator 110.Terminal computing unit 222 calculates has two terminals (such as in the coverage of the first LED light source 240, first terminal (T1) 250 and the second terminal (T2) 252), the coverage of the second LED light source 242 has a terminal (such as, second terminal 252), and there is no terminal in the coverage of the 3rd LED light source 244.Quantity (such as, have terminal in the coverage of two LED light sources) according to terminal, subband allocation unit 223 determines the number of sub-bands (such as, two sub-band SB1 and SB2) of LED light source.
In certain embodiments, because there is no terminal in the coverage of the 3rd LED light source 244, so subband allocation unit 223 also can by the modulating signal function setting of the 3rd DAC234 and the three LED244 in park mode, the oblique line on the 3rd DAC234 and the three LED light source 244 as Figure 2 illustrates is indicated.Pass through the modulating signal function setting of the 3rd DAC234 and the three LED244 in park mode, the power consumption (powerconsumption) of VLC device 200 can be saved.Subband allocation unit 223 also distributes sub-band SB1 and SB2 to each light source in LED light source 240 and 242 in order to the quantity of the terminal 250 and 252 in the coverage according to LED light source 240 and 242.That is, as shown in Figure 2, because having both first terminal 250 and the second terminal 252 in the coverage of the first LED light source 240, so subband allocation unit 223 can assign the first sub-band SB1 that signal quality data rate better, transmissible (datarate) is higher to the first LED light source 240.Additionally, because only have the second terminal 252 in the coverage of secondary light source LED242, so subband allocation unit 223 can assign relatively low the second sub-band SB2 of signal data rate second-rate, transmissible to the second LED light source 242, as shown in Figure 3.That is, because the terminal quantity in the coverage of the first LED light source 240 is more than the terminal quantity in the coverage of the second LED light source 242, the first sub-band SB1 can be assigned to the first LED light source 240, and assign the second sub-band SB2 to the second LED light source 242, so that the first sub-band SB1 provides higher data rate.Bandwidth allocation element 224 carrys out assigned bandwidth to each terminal in terminal T1 and T2 according to sub-band SB1 and the SB2 distributed by subband allocation unit 223.As shown in Figure 3, first terminal T1 receives the part of the bandwidth of the first sub-band SB1 (such as, illustrate the region of point-like), and the second terminal T2 receives the bandwidth of a part of the first sub-band SB1 and the second sub-band SB2 (such as, illustrate horizontal region), this is because the second terminal T2 can receive signal from both the first LED light source 240 and the second LED light source 242 simultaneously.
Controller 220 can also include DSP225.DSP225 is in order to the quantity according to sub-band SB1 and SB2 and bandwidth, by transmission data DATA1 modulation on the sub-band of LED light source 240 and 242.In certain embodiments, modulated transmission data DATA1 can be converted to the multiple analogue signals for driving the first LED light source 240 and the second LED light source 242 by DAC230 and the two DAC232.As shown in Figures 2 and 3, the quantity of the digital analog converter used in VLC device 200 is relevant to the quantity of sub-band SB1 and SB2 that subband allocation unit 223 determines, and through being arranged in park mode by the modulation function of the 3rd DAC3234 and the three LED light source 244, make VLC device 200 can save electric power.Additionally, through using the multi-band OFDM shown in Fig. 2, the transmittability of VLC device 200 can be improved, and each terminal can receive equal transmittability.Therefore, VLC device 200 can improve the phenomenon that part VLC device transmittability is uneven.Additionally, VLC device 200 only needs to increase extra functional unit in controller 220, and the quantity of DAC can be increased to increase the maximum quantity of sub-band.These characteristics (attribute) allow VLC device 200 dynamically assigned resources.Owing to received signal can be considered as single frequency band, therefore need not increasing extra cost on the receive side by receiving terminal when solving modulation (demodulation).
Fig. 4 is the schematic diagram of the VLC device of another one exemplary embodiment of the present invention, and Fig. 5 is the power of sub-band of VLC device and the frequency relation figure of Fig. 4 one exemplary embodiment.Refer to Fig. 4 and Fig. 5, in the present embodiment, VLC device 400 is similar to the VLC device 200 of Fig. 2 depicted.Difference between VLC device 400 and VLC device 200 is such as in that, VLC device 400 has first LED light source the 440, second LED light source the 442, the 3rd LED light source 444.First LED light source the 440, second LED light source 442 and the 3rd LED light source 444 correspond respectively to a DAC430, the 2nd DAC432 and the three DAC434.In the present embodiment, controller 420 receives transmission data DATA1 to carry out VLC transmission multi-band OFDM from communicator 110.Terminal computing unit 422 calculates has two terminals (such as in the coverage of the first LED light source 440, first terminal 450 and the second terminal 452), the coverage of the second LED light source 442 has two terminals (such as, second terminal 452 and third terminal (T3) 454), and there are three terminals (such as, the second terminal 452, third terminal 454 and the 4th terminal (T4) 456) in the coverage of the 3rd LED light source 444.Quantity according to terminal is (such as, three LED light sources have terminal in coverage), subband allocation unit 423 determines the number of sub-bands (such as, three sub-band SB1, SB2 and SB3) of first LED light source the 440, second LED light source 442 and the 3rd LED light source 444.
Subband allocation unit 223 also distributes sub-band SB1, SB2 and SB3 to each light source in LED light source 440,442 and 444 in order to the quantity of the terminal 450,452,454 and 456 in the coverage according to LED light source 440,442 and 444.That is, as shown in Figure 4, because there is the most multiple terminal (such as, the second terminal 452, third terminal 454 and the 4th terminal 456) in the coverage of the 3rd LED light source 444, so the first sub-band SB1 is assigned to the 3rd LED light source 444 by subband allocation unit 423.The coverage of the first LED light source 440 and the second LED light source 442 respectively have two terminals, second sub-band SB2 can be assigned to the second LED light source 442 by subband allocation unit 423, this is because the second LED light source 442 is relatively close to intensive (populated) region (such as, the region of terminal 452,454 and 456) of terminal.And the 3rd sub-band SB3 is assigned to the first LED light source 440 by subband allocation unit 423.In the present embodiment, as it is shown in figure 5, the first sub-band SB1 has the highest data rate, the 3rd sub-band SB3 has minimum data rate, and the second sub-band SB2 has the data rate between the first sub-band SB1 and the three sub-band SB3.First sub-band SB1 is assigned to the 3rd LED light source 444 by subband allocation unit 423.Bandwidth allocation element 424 carrys out assigned bandwidth to each terminal in terminal 450,452,454 and 456 according to the sub-band SB1, SB2 and the SB3 that are distributed by subband allocation unit 423.As shown in Figure 5, first terminal 450 receives the part of the bandwidth of the 3rd sub-band SB3 (such as, figure has the region of point-like), second terminal 452 receives the part of the bandwidth of sub-band SB2 and SB3 (such as, figure has horizontal region), third terminal 454 receives the part of the bandwidth of sub-band SB1 and SB2 (such as, figure has the region of straight line cross figure), and the 4th terminal 456 receives a part (such as, having the region of diagonal cross figure in figure) for the bandwidth of the first sub-band SB1.In another embodiment, the second terminal 452 can receive a part for the bandwidth of sub-band SB1, SB2 and SB3.In this one exemplary embodiment, bandwidth allocation element 424 also can according to user's request (userrequirement) by bandwidth allocation to terminal 450,452,454 and 456, or bandwidth allocation can uniform distribution between four terminals, but the invention is not restricted to this.
Controller 420 can also include DSP425.DSP425 in order to according to sub-band SB1, the quantity of SB2 and SB3 and bandwidth will transmission data DATA1 modulation on the sub-band of LED light source 440,442 and 444.In certain embodiments, DAC430,432 and 434 modulated transmission data DATA1 can be converted to multiple analogue signals for driving LED light source 440,442 and 444.As shown in Figure 4 and Figure 5, the quantity of the digital analog converter used in VLC device 400 is relevant to the quantity of sub-band SB1, SB2 and SB3 that subband allocation unit 423 determines.It is similar to the VLC device 200 of Fig. 2, through using the multi-band OFDM shown in Fig. 4, the transmittability of VLC device 400 can be improved, and each terminal can receive enough transmission quantities.Therefore, VLC device 400 also can improve the phenomenon that part VLC device transmission quantity is uneven.Additionally, VLC device 400 only needs to increase extra functional unit in controller 420, and the quantity of DAC can be increased to increase the maximum quantity of sub-band.These characteristics allow also to VLC device 400 dynamically assigned resources.Because received signal can be considered as single sub-band when solving modulation by receiving terminal, so need not increase extra cost on the receive side.
Along with the disclosure of aforementioned VLC device 200 and VLC device 400, the present invention is a kind of open visible light communication method also.Fig. 6 is the flow chart of steps of the visible light communication method of the present invention one one exemplary embodiment.In step S602, calculating the terminal quantity of the respective coverage of multiple LED light source, wherein these LED light sources include the first LED light source and the second LED light source.In step s 604, determining the number of sub-bands of multiple sub-band according to terminal quantity, wherein these sub-bands include the first sub-band and the second sub-band.In step S606, according to the terminal quantity in the respective coverage of these LED light sources, distribute the first sub-band and to the first LED light source and distribute the second sub-band to the second LED light source.Described first sub-band and described second sub-band differ.In step S608, carry out assigned bandwidth to each terminal according to the sub-band distributed or user demand.In the present embodiment, in step S610, data-modulated will be transmitted on the first sub-band and one of them sub-band of the second sub-band.In another embodiment, can by transmission data-modulated on the first sub-band and the second sub-band.In another embodiment, can by transmission data-modulated on the first sub-band and the second sub-band.In certain embodiments, can pass through the terminal quantity in the respective coverage of these LED light sources, determine the signal quality of each sub-band distributed.In other embodiments, DSP is in order to carry out modulation transmission data according to number of sub-bands and bandwidth.In certain embodiments, multiple DAC are arranged between controller and these LED light sources.Modulated transmission data are converted to the multiple analogue signals being respectively used to drive these LED light sources by DAC, and wherein the quantity of digital analog converter is relevant to number of sub-bands.In other embodiments, can pass through the terminal quantity in the respective coverage of these LED light sources, determine the signal quality of each sub-band distributed.In other embodiments, would correspond to do not have each digital analog converter of each LED light source of any terminal to be arranged at park mode in coverage.In certain embodiments, the modulation function not having each LED light source of any terminal in coverage is arranged at park mode.
Fig. 7 is signal noise ratio (Signal-to-noiseratio, SNR) and the frequency relation figure of the experimental result of the VLC device of the present invention one one exemplary embodiment.Fig. 8 illustrates data rate increment rate and the number of frequency bands graph of a relation of the experimental result of the VLC device of the present invention one one exemplary embodiment.Fig. 9 is bit error rate (biterrorrate, BER) and the number of frequency bands graph of a relation of the experimental result of the VLC device of the present invention one one exemplary embodiment.In Fig. 7, " 1 frequency band " represents number of frequency bands is 1；" 2-1 frequency band " represents the first sub-band in 2 frequency bands (number of frequency bands is 2), and " 2-2 frequency band " represents the second sub-band in 2 frequency bands；" 3-1 frequency band " represents the first sub-band in 3 frequency bands (number of frequency bands is 3), and " 3-2 frequency band " represents the second sub-band in 3 frequency bands, and " 3-3 frequency band " represents the 3rd sub-band in 3 frequency bands.As shown in the experimental result of Fig. 7, along with the quantity of sub-band becomes big, the SNR of OFDM subcarrier (subcarrier) also increases.The reason causing this phenomenon is the low peak due to sub-band and average power ratio (peak-to-averagepowerratio, PAPR), can improve modulation energy, and therefore receiving terminal can obtain big reception signal, and is obtained good SNR.The Comparison of experiment results of Fig. 8 under different light intensities, the data rate of its different number of sub-bands and increment rate thereof.In fig .9, the data rate of Comparison of experiment results difference sub-band number and bit error rate.In Fig. 9, " data: 1 " represent accessible data rate when number of frequency bands is 1, " data: 2 " represent the data rate that when number of frequency bands is 2, each sub-band respectively reaches, and " data: 3 " represent the data rate that when number of frequency bands is 3, each sub-band respectively reaches；" BER:1 " represents number of frequency bands is bit error rate when 1, and " BER:2 " represents each sub-band bit error rate respectively when number of frequency bands is 2, and " BER:3 " represents each sub-band bit error rate respectively when number of frequency bands is 3.As it is shown in figure 9, the data rate of single frequency band is more than the data rate of the sub-band of other quantity.But, although the data rate of each respective sub-bands of other quantity sub-bands is likely lower than single frequency band, but in this one exemplary embodiment, the summation of the data rate of multiple sub-bands is more than the data rate of single frequency band.Additionally, due to the sub-band at different sub-band places has different frequency responses, therefore the data rate of each sub-band is differing from each other.Therefore, the experimental result of Fig. 9 shows that the sane mechanism of good visible light communication needs is to assign transmittability and resource.
In view of foregoing teachings, through the visible light communication equipment and the visible light communication method that adopt one exemplary embodiment, it may be achieved multi-band OFDM modulation, the transmittability of VLC device can be improved, and each user terminal can receive enough transmission quantities.VLC device also can improve the phenomenon that part VLC device transmittability is uneven.Additionally, the framework of VLC device and method only needs to increase extra functional unit in the controller, and the quantity of DAC can increase according to the quantity of sub-band.These characteristics allow VLC device and method to reduce the time calculating receiving terminal and dynamically assigned resources.Because received signal is considered as during modulation as single frequency band solving by receiving terminal, so need not increase extra cost on the receive side.
Unless the present invention clearly states, otherwise it is disclosed in the element in the detailed description of one exemplary embodiment, action or instruction and should not be construed as purposes of the invention for definitely crucial or necessary element, action or instruction.Further, the word " " used in the present invention can include one or more than.If only referring to a project, then the present invention will use " single " or similar word.In addition, in the present invention, word before the list of multiple projects and/or multiple project kind " in any one ", it includes described project and/or project kind individually or in conjunction with sundry item and/or sundry item kind " in any one ", " in any combination ", " in any number of " and/or " in multiple any combinations ".Additionally, in the present invention, word " set " includes any amount of set element, also includes zero.Additionally, in the present invention, word " quantity " includes any quantity, also includes zero.
Those skilled in the art will appreciate that, without departing from the scope or spirit of the invention, the framework of disclosed one exemplary embodiment can carried out various modifications and variations.In view of the foregoing, the present invention contains its modifications and variations, and described modifications and variations each fall within the scope of right and equivalence thereof.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only specific embodiments of the invention; it is not limited to the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Additionally, unless present invention statement is limited to disclosed order or element, otherwise right should not be considered limited to disclosed order or element.
Claims (18)
1. a visible light communication equipment, it is characterised in that including:
Multiple visible light sources；And
Controller, is couple to these visible light sources, and the terminal quantity being configured to the respective coverage according to these visible light sources determines the number of sub-bands of multiple sub-band, and wherein these sub-bands include the first sub-band and the second sub-band,
Wherein these visible light sources include:
First visible light source, is configured to use described first sub-band；And
Second visible light source, is configured to use described second sub-band, and described first sub-band and described second sub-band differs,
Wherein, described controller be configured to receive transmission data, and described controller, described first visible light source or described second visible light source by described transmission data-modulated on described first sub-band and described one of them sub-band of second sub-band.
2. visible light communication equipment according to claim 1, wherein said controller includes:
Terminal computing unit, is configured to calculate the described terminal quantity of the respective coverage of these visible light sources；
Subband allocation unit, it is configured to determine described number of sub-bands according to described terminal quantity, and according to described terminal quantity, distribute described first sub-band and to described first visible light source and distribute described second sub-band to described second visible light source；And
Bandwidth allocation element, is configured to according to described first sub-band and described second sub-band or carrys out assigned bandwidth to each described terminal according to user demand.
3. visible light communication equipment according to claim 1, wherein through the described terminal quantity of the respective coverage of these visible light sources, determines the signal quality of each sub-band distributed.
4. visible light communication equipment according to claim 2, described controller also includes:
Digital signal processor, be configured to according to described number of sub-bands and described bandwidth by described transmission data-modulated on described first sub-band and described one of them sub-band of second sub-band.
5. visible light communication equipment according to claim 4, also includes:
Multiple digital analog converters, are coupled between described controller and corresponding these visible light sources described, and described modulated transmission data are converted to the multiple analogue signals for driving these visible light sources by described digital analog converter.
6. visible light communication equipment according to claim 5, wherein said controller would correspond to do not have each described digital analog converter of each described visible light source of terminal to be arranged at park mode in coverage.
7. visible light communication equipment according to claim 1, wherein coverage be there is no to each described visible light source of terminal, corresponding modulation function is arranged at park mode by described controller, wherein this modulation function in order to by described transmission data-modulated at described sub-band.
8. visible light communication equipment according to claim 7, does not wherein have each described visible light source of terminal for coverage, and this corresponding modulation function is arranged at park mode by described subband allocation unit.
9. visible light communication equipment according to claim 1, wherein these visible light sources also include the 3rd visible light source, these sub-bands also include the 3rd sub-band, described 3rd visible light source is configured to use described 3rd sub-band, and wherein said first sub-band, described second sub-band and described 3rd sub-band differ.
10. visible light communication equipment according to claim 1, wherein said controller in order to by described transmission data-modulated on described first sub-band and described second sub-band.
11. a visible light communication method, it is characterised in that including:
Calculating the terminal quantity of the respective coverage of multiple visible light source, wherein these visible light sources include the first visible light source and the second visible light source；
Determine the number of sub-bands of multiple sub-band according to described terminal quantity, wherein these sub-bands include the first sub-band and the second sub-band；
The described terminal quantity of the respective coverage according to these visible light sources, distributing described first sub-band and to described first visible light source and distribute described second sub-band to described second visible light source, wherein said first sub-band and described second sub-band differ；
Assigned bandwidth is carried out to each described terminal according to the sub-band distributed or user demand；And
Data-modulated will be transmitted on described first sub-band and described one of them sub-band of second sub-band.
12. visible light communication method according to claim 11, wherein through the described terminal quantity of the respective coverage of these visible light sources, determine the signal quality of each sub-band distributed.
13. visible light communication method according to claim 11, wherein described transmission data-modulated step on described first sub-band and described one of them sub-band of second sub-band is included:
According to described number of sub-bands and described bandwidth, through digital signal processor by described transmission data-modulated on described first sub-band and described one of them sub-band of second sub-band.
14. visible light communication method according to claim 13, also include:
Through multiple digital analog converters, described modulated transmission data are converted to the multiple analogue signals for driving these visible light sources.
15. visible light communication method according to claim 14, wherein would correspond to do not have each described digital analog converter of each described visible light source of terminal to be arranged at park mode in coverage.
16. visible light communication method according to claim 11, wherein coverage be there is no to each described visible light source of terminal, corresponding modulation function is arranged at park mode, wherein this modulation function in order to by described transmission data-modulated at described sub-band.
17. visible light communication method according to claim 11, wherein these visible light sources also include the 3rd visible light source, these sub-bands also include the 3rd sub-band, described visible light communication method also includes: distributing described 3rd sub-band to described 3rd visible light source, wherein said first sub-band, described second sub-band and described 3rd sub-band differ.
18. visible light communication method according to claim 11, wherein by described transmission data-modulated on described first sub-band and described second sub-band.
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| US14/583,811 US9432117B2 (en) | 2014-12-29 | 2014-12-29 | Visible light communication apparatus and method of visible light communication |
| US14/583,811 | 2014-12-29 | ||
| TW104119565A TWI573408B (en) | 2014-12-29 | 2015-06-17 | Visible light communication apparatus and method of visible light communication |
| TW104119565 | 2015-06-17 |
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