AU2021103344A4 - Multi-input multi-output visible light communication transmitting device with combined optical beams - Google Patents
Multi-input multi-output visible light communication transmitting device with combined optical beams Download PDFInfo
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- AU2021103344A4 AU2021103344A4 AU2021103344A AU2021103344A AU2021103344A4 AU 2021103344 A4 AU2021103344 A4 AU 2021103344A4 AU 2021103344 A AU2021103344 A AU 2021103344A AU 2021103344 A AU2021103344 A AU 2021103344A AU 2021103344 A4 AU2021103344 A4 AU 2021103344A4
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- 238000004891 communication Methods 0.000 title claims abstract description 67
- 230000003287 optical effect Effects 0.000 title claims abstract description 58
- 238000012545 processing Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000003491 array Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 description 27
- 238000005516 engineering process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- RICKKZXCGCSLIU-UHFFFAOYSA-N 2-[2-[carboxymethyl-[[3-hydroxy-5-(hydroxymethyl)-2-methylpyridin-4-yl]methyl]amino]ethyl-[[3-hydroxy-5-(hydroxymethyl)-2-methylpyridin-4-yl]methyl]amino]acetic acid Chemical group CC1=NC=C(CO)C(CN(CCN(CC(O)=O)CC=2C(=C(C)N=CC=2CO)O)CC(O)=O)=C1O RICKKZXCGCSLIU-UHFFFAOYSA-N 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910020346 SiS 2 Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000002153 concerted effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
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- Computer Networks & Wireless Communication (AREA)
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
The invention relates to the technical field of visible light communication, in particular to a
multi-input multi-output visible light communication transmitting device with combined
optical beams, which comprises a serial-parallel data conversion module and a plurality of
visible light communication transmitters, wherein each visible light communication transmitter
comprises an intermediate data processing unit and LED light source arrays, and the spatial
characteristics of optical beams of each LED light source array are different from each other.
The serial-parallel data conversion module is used for converting the original serial data stream
to be transmitted into a parallel data stream. The intermediate data processing unit loads the
modulate data to the LED light source array. The LED light source array emits optical beams
and emits the received modulated data through the optical beams. According to the invention,
the diversity of optical beams spatial characteristics of the LED light source array is utilized,
the limiting factors of the traditional technical scheme on the user receiving position are
eliminated, the stability of communication performance at different receiving positions is
improved on the premise of not changing the conventional lighting design size and the existing
light source arrangement mode, and the communication performance is compatible with the
existing receiver.
3/3
Photodetector
Demodulatig Light beam
Original datasams Phtdeco
H-1
Demoduat Light beam
original data sImsPotdtco
Deduati Light beam
Original datastemsgaPhodecr
FIG. 6
Conventional Symmetrical cup
Lambertian light shaped wave beam
wave beam source source
Visible light
Direct light communication
signal path receiverwithtwo
- -photodetectors
Working plane
where mobile
terminal is located
FIG. 7
Symmetricalcup- Non-rotationally
Long elliptical light shaped light wave symmetric light Conventional
wave beam source beam source wavebeam source Lambertian light wave
ean source
Direct light Visible light
signal path communication receiver
with four photodetecrors
Working plane
where mobile
terminal is located
FIG. 8
Description
3/3 Photodetector
Demodulatig Light beam
Original datasams Phtdeco
H-1 Demoduat Light beam original data sImsPotdtco
Deduati Light beam Original datastemsgaPhodecr
FIG. 6 Conventional Symmetrical cup Lambertian light shaped wave beam wave beam source source
Visible light Direct light communication signal path receiverwithtwo - -photodetectors Working plane where mobile terminal is located
FIG. 7
Symmetricalcup- Non-rotationally Long elliptical light shaped light wave symmetric light Conventional wave beam source beam source wavebeam source Lambertian light wave ean source
Direct light Visible light signal path communication receiver with four photodetecrors Working plane where mobile terminal is located
FIG. 8
Multi-input multi-output visible light communication transmitting device with
combined optical beams
The invention relates to the technical field of visible light communication, in particular to
a multi-input multi-output visible light communication transmitting device with
combined optical beams.
Visible light communication is to load the data electric signal onto the lighting
infrastructure based on LED through the driving circuit, and the light signal emitted by
the LED light source which is driven and lighted carries information, thus providing
wireless signal coverage for the area irradiated by the light source.
In order to provide sufficient power to the illumination area, the traditional LED light
source infrastructure generally uses LED lamps of the same kind of Lambert optical
beams to form a light source array. Although this method can multiply the transmission
capacity of the system compared with the single-input technology of visible light
communication on the premise of keeping the whole emitted light power unchanged, the
light source array and the multi-output acceptable photodetector will form a symmetrical
channel relationship at the center between the projections of different light sources and
the middle axis of other different light sources, as a result, the rank of the channel matrix
is reduced, and the channel uncorrelated condition cannot be met. The related process is
as follows:
Traditional 2x2MIMO technology uses two identical Lambert light sources, because of
the symmetry of optical beams of the two Lambert light sources. The emission angles
# of the two light sources are approximately equal, and the incident angles P of the two
receivers are also equal. Formula (1) is the channel DC gain formula, where i represents
the i-th LED light source and j represents the j-th receiver. A symmetrical spatial
geometric relationship is formed between the receiver and different light source arrays,
and the DC gain of symmetrical channels is basically equal.
Ai (m + 1)
In formula (1), A is the receiving range of the j-th receiver, d. is the distance
between the i-th LED light source and the j-th receiver, m is the Lambert coefficient, and
p, is the receiving field angle.
Because the DC gains of symmetric channels are equal, i.e. h=h 2 1 and h2 =h2 2 ,the
channel matrix H formed by the receiver cannot satisfy the full rank condition.
H =i ~ hI h22 1 (2)
Furthermore, the receiver cannot obtain the correct inverse matrix H-1 of the channel
matrix, and the multiplication of the received signal array R and the inverse matrix
cannot be completed normally. To obtain the inverse matrix H- 1 , a test signal sequence
can be sent at the sending end first, and the receiver can also obtain the test signal sequence. When the receiver gets the received signal, the receiver can calculate the inverse matrix H-1 of the channel matrix by the inverse operation of the matrix. When the receiver knows the inverse matrix H-1 of the channel matrix, the receiver will use the inverse matrix H-1 obtained by testing the next time it receives the signal. Because the main influencing factor of R is the channel matrix, the channel matrix error will cause demodulation error at the receiver.
R = PLED(H S) N (3)
In formula (3), S =(SiS 2 )T is the signal sent by LED light source, PLED is the average
probability of LED emission, y is the probability of probe response and N is the
average noise.
T = H-% R (4)
Informula(4),T =(T,T2) is the transmitted signal demodulated by the receiver.
Therefore, the traditional 2x2MIMO technology has the problem of parallel
communication deterioration caused by channel symmetry in the axial position of light
source projection, and the same problem exists when the traditional 2x2MIMO
technology is extended to the traditional 4x4MIMO technology, and the channel matrix
H is 4x4 matrix.
This traditional defect greatly restricts the support of traditional visible light
communication MIMO technology for mobility. However, the existing research and
discussion on visible light communication MIMO technology mainly focus on: (1)
Improving the performance gain of the system by means of imaging receiver. (2)
Improving the adaptability of the system by changing the spatial orientation of
photodetectors in the receiver. (3) Improving the capacity of visible light communication
MIMO technology system by means of singular value decomposition technology. The
inherent performance defects of traditional design schemes in the projection axis
positions of different light sources have not been fundamentally eliminated. If the spatial
orientation of different photoelectricity is changed, the emitter size will be further
increased, which will cause inconvenience to users. Therefore, a new technical scheme is
urgently needed to solve the above technical problems.
The invention provides a multi-input multi-output visible light communication
transmitting device with combined optical beams, which overcomes the defects of the
prior art and can effectively solve the technical problem that the existing visible light
communication transmitter technology has channel symmetry on the axis position of light
source projection, which causes the deterioration of parallel communication.
The technical scheme of the invention is realized by the following measures: the multi
input multi-output visible light communication transmitting device combining optical
beams comprises a serial-parallel data conversion module and a plurality of visible light
communication transmitters, each visible light communication transmitter comprises an
intermediate data processing unit and LED light source arrays, and the optical beams
spatial characteristics of each LED light source array are different from each other.
The serial-parallel data conversion module converts the original serial data stream to be
transmitted into a parallel data stream and sends the parallel data stream to each
intermediate data processing unit.
The intermediate data processing unit modulates that parallel data stream and load the
modulated data stream to the LED light source array.
The LED light source array loads the modulated data stream into the optical beams and
emits it through the optical beams.
The following content is a further optimization or/and improvement of the technical
scheme of the above invention:
There are two visible light communication transmitters. Among them, the LED light
source array in the first visible light communication transmitter includes a plurality of
LED lamps which can emit traditional Lambert optical beams light sources, and the half
power angle of each LED lamp is 60 degrees. The second LED light source array
comprise a plurality of LED lamps capable of emit symmetrical cup-shaped optical
beams light sources.
There are four visible light communication transmitters. The first LED light source array
comprises a plurality of LED lamps capable of emitting traditional Lambert optical
beams light sources, and the half power angle of each LED lamp is 60 degrees. The
second LED light source array comprise a plurality of LED lamps capable of emit
symmetrical cup-shaped optical beams light sources. The third LED light source array
comprises a plurality of LED lamps capable of emitting non-rotationally symmetric optical beams light sources. The fourth LED light source array comprises a plurality of
LED lamps capable of emitting long elliptical optical beams light sources.
The intermediate data processing unit comprises a data processing module and a driving
loading circuit, wherein the data processing module is connected with the driving loading
circuit, and the driving loading circuit is connected with the LED light source array.
The data processing module comprises an encoder and a modulator, the serial-parallel
data conversion module is connected with the encoder, the encoder is connected with the
modulator, and the modulator is connected with the driving loading circuit.
The driving loading circuit comprises a biasing device and a DC power supply module,
the data processing module and the DC power supply module are both connected with the
biasing device, and the biasing device is connected with the LED light source array.
The visible light communication transmitter further comprises an LED lamp, and the
LED light source array is installed in the LED lamp.
According to the invention, by utilizing the diversity of spatial characteristics of optical
beams of LED light sources and the natural difference of optical signal power radiation
intensity from different LED light source arrays, the symmetrical channel relationship
between different LED light source arrays and different photodetectors in a multi-output
receiver is broken, that is, the symmetrical channel direct current gains h, # h2 1 and
h2 * h22 in the 2x2MIMO channel and the 4x4MIMO channel can be obtained in the
same way. The relevance of different visible light MIMO channels is fundamentally
eliminated, the inherent performance defects of traditional design schemes in different
light source projection middle axis positions are eliminated, the performance consistency of visible light MIMO systems in different receiving positions is improved, and the probability of channel matrix rank reduction, i.e. the probability of channel matrix H being a full rank matrix, is greatly reduced or even avoided, and is compatible with the conventional lighting design size requirements of visible light communication MIMO technology transmitters and the aesthetics and usage habits of ordinary users.
Different from the way of changing the spatial orientation of photodetectors in the
receiver, this scheme concentrates the design changes on the transmitter end, which is
compatible with the requirements of existing mobile receiving terminals, and can not only
serve multiple users, but also reduce the transformation cost. According to the invention,
a higher spatial position freedom degree is provided for the receiver, the mobility
performance of the whole visible light communication multi-input multi-output
technology is improved, and the receiver can be installed at more positions to receive
signals, instead of only the normal direction of the light source.
Fig. 1 is a control block diagram of the two-input two-output visible light communication
circuit of the present invention.
Fig. 2 is a control block diagram of the four-input four-output visible light
communication circuit of the present invention.
Fig. 3 is a schematic structural diagram of the data processing module of the present
invention.
Fig. 4 is a control diagram of the driving loading circuit of the present invention.
Fig. 5 is a circuit block diagram of the two-input two-output visible light communication
receiving device of the present invention.
Fig. 6 is a circuit block diagram of the four-input four-output visible light communication
receiving device of the present invention.
Fig. 7 is a schematic diagram of the two-input two-output visible light communication
transmitting device scheme of the present invention.
Fig. 8 is a schematic diagram of the four-input four-output visible light communication
transmitting device scheme of the present invention.
The present invention is not limited by the following embodiments, and the specific
implementation mode can be determined according to the technical scheme and the actual
situation of the present invention.
The invention will be further described with reference to the following embodiments and
figures:
As shown in fig. 1, fig. 2, fig. 7 and fig. 8, the multi-input multi-output visible light
communication transmitting device with combined optical beams comprises a serial
parallel data conversion module and a plurality of visible light communication
transmitters, each of which comprises an intermediate data processing unit and an LED
light source array, and the optical beams spatial characteristics of each LED light source
array are different from each other.
The serial-parallel data conversion module converts the original serial data stream to be
transmitted into a parallel data stream and sends the parallel data stream to each
intermediate data processing unit.
The intermediate data processing unit modulates that parallel data stream and load the
modulated data stream to the LED light source array.
The LED light source array loads the modulated data stream into the optical beams and
emits it through the optical beams.
The original serial data stream to be transmitted is an original high-speed serial data
stream, and the serial-parallel data conversion module converts the original serial data
stream to parallel data streams, and the parallel data streams respectively enter a plurality
of visible light communication transmitters. According to the invention, a plurality of
visible light communication transmitters are arranged, each visible light communication
transmitter comprises an LED light source array, and the spatial characteristics of optical
beams of all LED light source arrays are different from each other, so that the
symmetrical channel relationship between different LED light source arrays and different
photodetectors in a plurality of receivers is broken by virtue of the different spatial
characteristics of different optical beams, namely symmetrical channel direct current
gains h, # h2 1 and h 2 h 22 in the 2x2MIMO channel. The 4x4MIMO channel can be
obtained in the same way, eliminating the correlation of different visible light MIMO
channels, eliminating the inherent performance defects of traditional design schemes in
different light source projection middle axis positions, improving the performance consistency of visible light MIMO systems in different receiving positions, and greatly reducing or even avoiding the probability of channel matrix rank reduction.
As shown in fig. 5, fig. 6, fig. 7 and fig. 8, the optical beams emitted by the LED light
source array are received by a visible light communication receiving device, which is
known in the art and can include an inverse matrix of a channel matrix, a plurality of
amplifiers, a plurality of low-pass filters, a plurality of decoders, a plurality of
demodulators and a plurality of photodetectors. The number of amplifiers, low-pass
filters, decoders, demodulators and photodetectors is the same as that of LED light source
arrays in the invention. Photodetectors convert optical signals into weak electrical signals,
then amplifiers amplify the weak electrical signals, and the amplified signals are
multiplied by inverse matrix H 1 to obtain transmission signals. The low-pass filters
filter out high-frequency signals and noises in the transmission signals, and the filtered
signals are demodulated by demodulators and decoded by decoders to obtain original data
streams. In which the inverse matrix of the channel matrix can be obtained from the
inverse matrix H 1 obtained from the test signal.
According to actual needs, the above multi-input multi-output visible light
communication transmitting device with combined optical beams can be further
optimized or/and improved:
As shown in fig. 1, there are two visible light communication transmitters. Among them,
the LED light source array in the first visible light communication transmitter includes a
plurality of LED lamps which can emit traditional Lambert optical beams light sources,
and the half power angle of each LED lamp is 60 degrees. And the second LED light source array comprise a plurality of LED lamps capable of emit symmetrical cup-shaped optical beams light sources.
The spatial characteristics of optical beams of the above two LED light source arrays are
different from each other. When the two LED light source arrays emit optical beams,
although the geometric relationship between different photodetectors and different light
sources on the visible light communication receiving device is still symmetrical, due to
the difference in radiation intensity from different light sources, the symmetry of visible
light channels between different receiving and transmitting ends is broken, so the
probability of rank reduction of multi-input multi-output channel matrix will be
significantly reduced, ensuring the adaptability of visible light communication multi
input multi-output system to different receiving positions. Among them, the normal
direction of all LED light source arrays still points vertically to the ground, and the
design scheme keeps smooth connection with the basic lighting function of light sources
and the traditional habits of users.
As shown in fig. 2, there are four visible light communication transmitters. The first LED
light source array comprises a plurality of LED lamps capable of emitting traditional
Lambert optical beams light sources, and the half power angle of each LED lamp is 60
degrees. The second LED light source array comprise a plurality of LED lamps capable
of emit symmetrical cup-shaped optical beams light sources. The third LED light source
array comprises a plurality of LED lamps capable of emitting non-rotationally symmetric
optical beams light sources. The fourth LED light source array comprises a plurality of
LED lamps capable of emitting long elliptical optical beams light sources.
The spatial characteristics of optical beams of the four LED light source arrays are
different from each other.
As shown in figs. 1 and 2, the intermediate data processing units all include a data
processing module and a driving loading circuit, wherein the data processing module is
connected with the driving loading circuit, and the driving loading circuit is connected
with the LED light source array.
As shown in fig. 3, the data processing module includes an encoder and a modulator, the
serial-parallel data conversion module is connected with the encoder, the encoder is
connected with the modulator, and the modulator is connected with the driving loading
circuit.
After the original serial data stream to be transmitted is concerted into a parallel data
stream by the serial-parallel data conversion module, the encoder encodes the parallel
data stream to obtain a suitable signal that can be transmitted in the channel, which
improves the error correction and anti-interference ability of the communication system.
The modulator modulates the signal so that the signal can be transmitted in a suitable
channel, thus increasing the effectiveness of the communication system.
As shown in fig. 4, the driving loading circuit includes a biasing device and a DC power
supply module, both of which are connected with the biasing device, and the biasing
device is connected with the LED light source array.
The modulate signal from the digital processing module and the direct current signal
provide by the direct current power supply module are respectively superimposed by the
direct current bias, so that the superimposed signal reach the threshold voltage of the
LED light source, and then a loading signal is output, thereby lighting the LED light
source array.
As shown in figs. 1 and 2, the visible light communication transmitter further comprises
an LED lamp, and the LED light source array is installed in the LED lamp.
The above technical features constitute an embodiment of the present invention, which
has strong adaptability and the best implementation effect, and can increase or decrease
unnecessary technical features according to actual needs to meet the needs of different
situations.
Claims (8)
1. A multi-input multi-output visible light communication transmitting device with
combined optical beams, which is characterized by comprising a serial-parallel data
conversion module and a plurality of visible light communication transmitters, each of
which comprises an intermediate data processing unit and an LED light source array, and
the spatial characteristics of optical beams of each LED light source array are different
from each other.
The serial-parallel data conversion module converts the original serial data stream to be
transmitted into a parallel data stream and sends the parallel data stream to each
intermediate data processing unit.
The intermediate data processing unit modulates that parallel data stream and load the
modulated data stream to the LED light source array.
The LED light source array loads the modulated data stream into the optical beams and
emits it through the optical beams.
2. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 1, characterized in that there are two visible
light communication transmitters. Among them, the LED light source array in the first
visible light communication transmitter includes a plurality of LED lamps which can emit
traditional Lambert optical beams light sources, and the half power angle of each LED
lamp is 60 degrees. The second LED light source array comprise a plurality of LED
lamps capable of emit symmetrical cup-shaped optical beams light sources.
3. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 1, characterized in that there are four visible
light communication transmitters. The first LED light source array comprises a plurality
of LED lamps capable of emitting traditional Lambert optical beams light sources, and
the half power angle of each LED lamp is 60 degrees. The second LED light source array
comprise a plurality of LED lamps capable of emit symmetrical cup-shaped optical
beams light sources. The third LED light source array comprises a plurality of LED
lamps capable of emitting non-rotationally symmetric optical beams light sources. The
fourth LED light source array comprises a plurality of LED lamps capable of emitting
long elliptical optical beams light sources.
4. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 1 or 2 or 3, characterized in that the
intermediate data processing unit comprises a data processing module and a driving
loading circuit, wherein the data processing module is connected with the driving loading
circuit, and the driving loading circuit is connected with the LED light source array.
5. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 4, characterized in that the data processing
module comprises an encoder and a modulator, the serial-parallel data conversion module
is connected with the encoder, the encoder is connected with the modulator, and the
modulator is connected with the driving loading circuit.
6. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 4, characterized in that the driving loading circuit comprises a biasing device and a DC power supply module, the data processing module and the DC power supply module are both connected with the biasing device, and the biasing device is connected with the LED light source array.
7. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 1, 2, 3, 5 or 6, characterized in that the visible
light communication transmitter further comprises an LED lamp, and the LED light
source array is installed in the LED lamp.
8. The multi-input multi-output visible light communication transmitting device with
combined optical beams according to claim 4, characterized in that the visible light
communication transmitter further comprises an LED lamp, and the LED light source
array is installed in the LED lamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021103344A AU2021103344A4 (en) | 2021-06-15 | 2021-06-15 | Multi-input multi-output visible light communication transmitting device with combined optical beams |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021103344A AU2021103344A4 (en) | 2021-06-15 | 2021-06-15 | Multi-input multi-output visible light communication transmitting device with combined optical beams |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021103344A4 true AU2021103344A4 (en) | 2021-08-05 |
Family
ID=77076062
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| AU2021103344A Ceased AU2021103344A4 (en) | 2021-06-15 | 2021-06-15 | Multi-input multi-output visible light communication transmitting device with combined optical beams |
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2021
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