AU2021104252A4 - A switchable optical beams based visible light communication transmitter and communication method - Google Patents
A switchable optical beams based visible light communication transmitter and communication method Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 271
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003491 array Methods 0.000 claims abstract description 45
- 230000001965 increasing effect Effects 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
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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
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
-
- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
-
- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
Abstract
The invention relates to the technical field of visible light communication, in particular to a
switchable optical beams based visible light communication transmitter and communication
method. The former includes transmitter uplink subsystem, basic data transceiving unit and
transmitter downlink subsystem. The transmitter downlink subsystem comprises a plurality of
LED light source sub-arrays and a plurality of driving circuits. The transmitter uplink
subsystem selects one or two optical beams with the highest optical signal intensity in the
sequence. The basic data transceiving unit includes one receiving antenna unit, one digital
demodulator and one data modulation unit. According to the invention, the modulated carrier
data stream can be added to the optical beam with the highest optical signal intensity, so that
the optical beam quality received by the transmitter uplink subsystem can concentrate the data
stream in the optical beam in the direction where the transmitter uplink subsystem is located
regardless of the position of the visible light communication cell, and the received optical beam
quality and communication quality are guaranteed.
1/8
FIGURES
Transmitter downlink subsystem
LED light source sub-array
Modulated data stream I Azimuth of light beam 0° 180°
----- --I drive circuit 1
oAzimuth of light beam 45° 225°
Modulated dat a steam:
Transmitter
Identification information cuplink
subsystem
Modulated dat a stream:
usse
dintfliaoli o~mitio dnive ciituit 3
Azimuth of light beam 90°270°
Modulated data streamI
IentifcatMion infonnati-on u vecrci
Azimuth of light beam 180° 360°
Paar basic circuit board
data stream -ai - at Radio frequency signal carrying identification information
transceiving unit
Fig.1
Transmitter downlink subsystem
- -- - - - - - ------------------------------Optical beam
Modulated I carrying
data stream iIidentification
driving signal LED light I information
- --- ----- - -- drive circuit source sub-arrav
Identification
information
Fig.2
Basic data transceiving unit
I -------- -------------------------------Radio frequency
Selected signal carying
Daa Identification identification iidentification
data stream oDuato information Digital information Receiving I information
moulatio demodulator antenna unit
Modulated Identification
data stream information
Fig.3
Description
1/8
Transmitter downlink subsystem LED light source sub-array
Modulated data streamI Azimuth of light beam 0° 180°
-------I drive circuit 1 oAzimuth of light beam 45° 225°
Modulated dat a steam: Transmitter Identification information cuplink subsystem usse Modulated dat a stream:
dintfliaoli o~mitio dnive ciituit 3 Azimuth of light beam 90°270°
Modulated data streamI
IentifcatMion infonnati-onu vecrci Azimuth of light beam 180° 360°
Paar basic circuit board
data stream -ai - at Radio frequency signal carrying identification information transceiving unit
Fig.1
Transmitter downlink subsystem
- -- - - - - - ------------------------------Optical beam Modulated I carrying data stream iIidentification driving signal LED light I information - --- ----- - -- drive circuit source sub-arrav Identification information
Fig.2
Basic data transceiving unit
I -- ---- -- -------------------------------Radio frequency Selected signal carying Daa Identification identification iidentification data stream oDuato information Digital information Receiving I information moulatio demodulator antenna unit
Modulated Identification data stream information
Fig.3
A switchable optical beams based visible light communication transmitter and
communication method
The invention relates to the technical field of visible light communication, in particular to
a switchable optical beams based visible light communication transmitter and
communication methods.
In indoor and outdoor scenes, visible light communication mainly loads data and
electrical signals to lighting infrastructure based on LED (generally LED array, in order
to ensure the emission power level) through driving circuit, and optical beams emitted by
LED light sources that are driven to light carry data information, thus providing wireless
signal coverage for the lamp and surrounding areas illuminated by the light sources.
Specifically, one single light source becomes a natural communication cell by
illuminating the covered indoor and outdoor areas. In small and medium-sized indoor
scenes, the number of light sources is relatively limited, and even sometimes only one
single LED light source is placed in the center of the ceiling of the room. The emitter
design conforming to Lambert optical beam LED is generally adopted in the existing
visible light communication technical scheme. With the spatial coincidence
characteristics of Lambert light source, with the increase of light exit angle, the
acceptance law of receiving plane decreases according to cosine law, which leads to the
vast majority of light power emitted by light source concentrated directly below the light source. In the edge area of visible light communication cell far away from the under-lamp area, the visible light communication signal that can be received by mobile terminals will be significantly reduced, which will eventually lead to insufficient coverage and even frequent interruption of communication links.
The invention provides a switchable optical beams based visible light communication
transmitter and communication method, which overcomes the defects of the prior art and
can effectively solve the problem that the quality of visible light communication signals
that can be received by one mobile terminal is low in the edge area far away from the
area under the lamp of the existing visible light communication planar transmitter.
One of the technical schemes of the invention is realized by the following measures: a
switchable optical beams based visible light communication transmitter, which comprises
one insulating shell, one transmitter uplink subsystem, one basic data transceiving unit
and one transmitter downlink subsystem.
The transmitter downlink subsystem comprises one planar basic circuit board arranged
outside the bottom of the insulating shell, a plurality of LED light source sub-arrays
arranged on the planar basic circuit board and a plurality of driving circuits arranged
inside the insulating shell, wherein the number of the driving circuits is the same as that
of the LED light source sub-arrays and corresponds to each other, and the driving circuits
control the corresponding LED light source sub-arrays to emit optical beams carrying
identification information or optical beams carrying modulated data streams, and the
optical beams carrying identification information emitted by each LED light source sub
array respectively point to different directions.
The transmitter uplink subsystem receives optical beams carrying identification
information, records the optical signal strength of each optical beam and the identification
information carried by each optical beam, obtains the strong and weak queuing order of
optical signal strength, selects one or two optical beams with the highest optical signal
strength, and sends the corresponding identification information to the basic data
transceiving unit.
The basic data transceiving unit comprises one receiving antenna unit, one digital
demodulator and one data modulation unit which are arranged inside the insulating shell,
wherein the receiving antenna unit receives identification information sent by the
transmitter uplink subsystem, the digital demodulator demodulates to obtain the
identification information, and the data modulation unit outputs a plurality of identical
identification information and a plurality of identical modulated data streams to each
driving circuit, and the numbers of the identification information, the modulated data
streams and the driving circuits are the same.
The following is a further optimization or/and improvement of one of the technical
schemes of the above invention:
The above-mentioned driving circuit comprises one switch module and one bias tee, and
each switch module corresponds to an identification information, the identification
information controls the switch module to open, the switch module is connected with the
bias tee, and the switch module controls the bias tee to load the modulated data stream.
The above-mentioned uplink subsystem comprises one photodetector, one amplifier, one
comparator, one digital modulator, one D/A converter, one radio frequency modulator
and one transmitting antenna, wherein the photodetector, the amplifier, the comparator, the digital modulator, the D/A converter, the radio frequency modulator and the transmitting antenna are sequentially connected to receive optical beams carrying identification information and transmit radio frequency signals carrying selected identification information.
The LED light source sub-array is an LED light source emitting single non-Lambert non
circularly symmetric optical beam.
The identification information comprises the total number of optical beams and an
identification number, and the identification number is a binary identification number.
The second technical scheme of the invention is realized by the following measures: a
communication method of the switchable optical beams based visible light
communication transmitter, which comprises:
Each driving circuit controls the corresponding LED light source sub-array to emit
optical beams carrying identification information, wherein each optical beam carrying
identification information points to different directions respectively, and the identification
information carried by each optical beam is different.
The transmitter uplink subsystem receives optical beams carrying identification
information, records the optical signal intensity of each optical beam and the
identification information carried by it, obtains the queuing order of the intensity of
optical signals, selects one or two optical beams with the highest optical signal intensity,
and sends the corresponding identification information to the basic data transceiving unit.
The receiving antenna unit receives the identification information sent by the transmitter
uplink subsystem, the digital demodulator demodulates to obtain the identification
information, and the data modulation unit outputs multiple identical identification information and multiple identical modulated data streams to each driving circuit, wherein the number of identification information, modulated data streams and driving circuits is the same.
Each driving circuit obtains one path of identification information and one path of
modulated data stream, starts the corresponding driving circuit through the identification
information, loads the modulated data stream to the corresponding LED light source sub
array, and the LED light source sub-array emits optical beams carrying the modulated
data stream.
The following is a further optimization or/and improvement of the second technical
scheme of the above invention:
The transmitter uplink subsystem receives optical beams carrying identification
information, and judging whether all optical beams carrying identification information
transmitted by all LED light source sub-arrays are received, comprises:
The transmitter uplink subsystem receives optical beams carrying identification
information for the first time, and records the optical signal intensity and identification
information of the optical beams. According to the identification information, the total
number Noptical beams emitted by the LED light source array is confirmed, wherein the
identification information includes the total number of optical beams and the
identification number. Noptical beams is the same as NLED light source sub-arrays.
The transmitter uplink subsystem continues to receive the optical beam with
identification information, records the optical signal strength and identification
information of the optical beam, and updates the queuing order of the optical signal
strength.
Judging whether the number of recorded identification information is less than Noptical
beams. If the response is no, stop receiving optical beams, and keep the recorded optical
signal strength, identification information and the strong and weak queuing order of
optical signal strength. If the response is yes, the recording times are increased by 1 to
judge whether the recording times reach the maximum value.
Judging whether the recording times reach the maximum value or not, if the response is
yes, stop receiving optical beams, and keep the recorded optical signal strength,
identification information and the strong and weak queuing order of the optical signal
strength. If the response is no, the transmitter uplink subsystem continues to receive the
optical beam carrying the identification information.
The transmitter uplink subsystem selects one or two optical beams with the highest
optical signal strength according to the queuing order of optical signal strength,
comprising:
Acquire the optical signal intensity Poptical beam i at the first position and the optical signal
intensity Poptical beam 2 at the second position in the strong and weak queuing order of
optical signal intensity, and judge whether the absolute value of the difference between
Poptical beam i and Poptical beam 2 is greater than APthreshold value.
If the response is yes, the identification information of the optical beam corresponding to
the optical signal intensity Poptical beam I is sent to the basic data transceiving unit.
If the response is no, the identification information of the optical beam corresponding to
the two opticalsignalstrengthsPoptical beam i and Poptical beam 2 is sent to the basic data
transceiving unit.
The above identification information starts the corresponding driving circuit, and the
driving circuit loads the modulated data stream to the corresponding LED light source
sub-array, and the LED light source sub-array emits the optical beam carrying the
identification information, comprising:
The receiving antenna unit receives the identification information sent by the transmitter
uplink subsystem, the digital demodulator demodulates to obtain the identification
information, the data modulation unit receives the data stream and the identification
information, and outputs a plurality of identical identification information and a plurality
of identical modulated data streams to each driving circuit, wherein the number of the
identification information, the modulated data stream and the driving circuit is the same.
Each driving circuit obtains one identification information and one modulation data
stream, and the identification information is matched with the switch module in the
driving circuit.
Activating the switch module which is successfully matched, loading the modulated data
stream to the corresponding LED light source sub-array, and emitting optical beams
loaded with the modulated data stream. Other switch modules with unsuccessful
matching are not activated, and the corresponding LED light source sub-arrays emit
optical beams loaded with DC driving signals.
When the transmitter uplink subsystem sends the identification information to the basic
data transceiving unit, it encodes the identification information and sends it to the basic
data transceiving unit in the form of radio frequency signals.
In the invention, the transmitter uplink subsystem receives the optical signal intensity and
identification data of optical beams transmitted by the transmitter downlink subsystem, and sorts the optical signal intensity of the received optical beams from strong to weak, and the basic data transceiving unit adds modulated carrier data to one or two optical beams with the highest optical signal intensity, thereby enhancing the optical beam quality received by the transmitter uplink subsystem. The data stream can be concentrated in the optical beam in the direction where the transmitter uplink subsystem is located, thus ensuring the optical beam quality and communication quality received by the transmitter and avoiding the introduction of additional transmission power consumption.
In addition, the invention is provided with one insulating shell, which is dustproof and
waterproof, and can effectively prolong the service life of the visible light communication
planar transmitter.
Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of the transmitter downlink subsystem in
Embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of the basic data transceiving unit in Embodiment
1 of the present invention.
Fig. 4 is a schematic structural diagram of the receiving antenna unit in Embodiment 1 of
the present invention.
Fig. 5 is a schematic structural diagram of the data modulation unit in Embodiment 1 of
the present invention.
Fig. 6 is a schematic structural diagram of the driving circuit in Embodiment 1 of the
present invention.
Fig. 7 is a schematic structural diagram of the transmitter uplink subsystem in
Embodiment 1 of the present invention.
Fig. 8 is a flowchart of Embodiment 2 of the present invention.
Fig. 9 is a flowchart of receiving optical beams by the transmitter uplink subsystem in
Embodiment 2 of the present invention.
Fig. 10 is a flowchart of selecting identification information of the transmitter uplink
subsystem in Embodiment 2 of the present invention.
Fig. 11 is a flowchart of transmitting optical beam carrying modulated data stream by the
transmitter downlink subsystem in Embodiment 2 of the present invention.
Fig. 12 is a schematic diagram of optical beam coverage in the square scene in
Embodiment 3 of the present invention.
Fig. 13 is a schematic diagram of beam coverage in the LED rectangular scene in
Embodiment 4 of the present invention.
Fig. 14 is a schematic diagram of optical beam coverage in edge area of LED rectangular
scene in Embodiment 4 of the present invention.
Fig. 15 is a schematic diagram of optical beam coverage in the center area of LED
rectangular scene in Embodiment 4 of the present invention.
Fig. 16 is a schematic diagram of LED triangular array light source in Embodiment 5 of
the present invention.
Fig. 17 is a schematic diagram of LED square array light source in Embodiment 6 of the
present invention.
Fig. 18 is a schematic diagram of LED circular arrangement light sources in Embodiment
7 of the present invention.
The present invention is not limited by the following embodiments, and the specific
implementation mode can be confirmed 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:
Embodiment 1, as shown in Figs. 1, 2, 3, 4, 5, the switchable visible light communication
transmitter based on optical beam includes one insulating shell, one transmitter uplink
subsystem, one basic data transceiving unit and one transmitter downlink subsystem.
The transmitter downlink subsystem comprises one planar basic circuit board arranged
outside the bottom of the insulating shell, a plurality of LED light source sub-arrays
arranged on the planar basic circuit board and a plurality of driving circuits arranged
inside the insulating shell, wherein the number of the driving circuits is the same as that
of the LED light source sub-arrays and corresponds to each other, and the driving circuits
control the corresponding LED light source sub-arrays to emit optical beams carrying
identification information or optical beams carrying modulated data streams, and the
optical beams carrying identification information emitted by each LED light source sub
array respectively point to different directions.
The transmitter uplink subsystem receives optical beams carrying identification
information, records the optical signal strength of each optical beam and the identification
information carried by each optical beam, obtains the strong and weak queuing order of
optical signal strength, selects one or two optical beams with the highest optical signal strength, and sends the corresponding identification information to the basic data transceiving unit.
The basic data transceiving unit comprises one receiving antenna unit, one digital
demodulator and one data modulation unit which are arranged inside the insulating shell,
wherein the receiving antenna unit receives identification information sent by the
transmitter uplink subsystem, the digital demodulator demodulates to obtain the
identification information, and the data modulation unit outputs a plurality of identical
identification information and a plurality of identical modulated data streams to each
driving circuit, and the numbers of the identification information, the modulated data
streams and the driving circuits are the same.
In the invention, the transmitter uplink subsystem receives the optical signal intensity and
identification data of optical beams transmitted by the transmitter downlink subsystem,
and sorts the optical signal intensity of the received optical beams from strong to weak,
and the basic data transceiving unit adds modulated carrier data to one or two optical
beams with the highest optical signal intensity, thereby enhancing the optical beam
quality received by the transmitter uplink subsystem. The data stream can be concentrated
in the optical beam in the direction where the transmitter uplink subsystem is located,
thus ensuring the optical beam quality and communication quality received by the
transmitter and avoiding the introduction of additional transmission power consumption.
In addition, the invention is provided with one insulating shell, which is dustproof and
waterproof, and can effectively prolong the service life of the visible light communication
planar transmitter.
In the above technical scheme, the LED light source sub-array can be an LED light
source emitting single non-Lambert non-circularly symmetric optical beam. The whole
LED light source is flat ellipsoid, showing obvious spatial directivity, and the emitted
non-Lambert optical beam has non-rotational symmetric spatial radiation characteristics.
Each LED light source sub-array is arranged on the planar basic circuit board, and each
LED light source sub-array emits optical beams in different directions, so that a plurality
of LED light source sub-arrays share the same emitter site position in space, which
greatly reduces the number of required sites, and can be applied to visible light
communication places where the total number of sites is obviously insufficient, even
places with only one single emitter site position (i.e., only one single light source
position), avoiding the significant increase in manufacturing cost caused by increasing
the size of LED light source arrays, and maintaining the advantages of the scheme in
manufacturing cost.
The optical beams carrying identification information emitted by each LED light source
sub-array point to different directions respectively, and the azimuth angles of each
direction can be equally spaced, so the two azimuth angles of the optical beams emitted
by the n(LED light source sub-array)-th can be calculated by the following formula:
3 On left side [Oinitial left side+( 60/(2NLED light source sub-arrays))x(nLED light source sub-arrays-1)
On right side [Oinitial left side+(360/( 2 NLED light source sub-arrays))x(nLED light source sub-arrays-1)]+1800
Wherein, Oinitial left side is the left azimuth angle of the pointing direction of the optical beam
emitted by the first LED light source sub-array, NLED light source sub-arrays is the total number
of LED LED lsourcesub-arraysintheLEDlight source array, nLED light source sub-arrays is the
n-th LED light source sub-array, n=2,...NLED light source sub-arrays.
Among them, 360 is 360 degrees, and 2NLED light source sub-arrays reflectsthe azimuth angle of
the optical beam pointing direction. For example, initial left side and Oinitial right side together
constitute the azimuth angle of the optical beam emitted by the first LED light source
1 sub-array, that is, initial right side initial left side+ 8 0 °. The covering horizontal azimuth
angles of optical beams emitted by other LED light source sub-arrays are the same.
The optical beams carrying identification information emitted by the plurality of LED
light source sub-arrays are unique in identification information of each optical beam, and
the identification information comprises the total number of optical beams and an
identification number, and the identification number can be a binary identification
number. Using binary bits as identification numbers can ensure that the information
amount of identification information is small, thus occupying less transmission resources.
If there are eight LED light source sub-arrays and emitting eight optical beams, only three
binary bits are needed to identify all optical beams. If there are four LED light source
sub-arrays emitting four optical beams, only two binary bits are needed to identify all
optical beams, and if there are two LED light source sub-arrays emitting two optical
beams, only one binary bit is needed to identify all optical beams.
In the above technical scheme, the transmitter uplink subsystem selects one or two optical
beams with the highest optical signal intensity, and can modulate the identification
information corresponding to the selected optical beams, load the identification
information into the radio frequency signal and send it to the basic data transceiving unit.
In the above technical scheme, the basic data transceiving unit outputs multiple identical
identification information and multiple modulated data streams to each driving circuit,
and the number of identification information, modulated data streams and driving circuits is the same. Each driving circuit obtains one path of identification information and one path of modulated data stream, and the identification information starts the corresponding driving circuit, so that the driving circuit loads the modulated data stream to the corresponding LED light source sub-array, and the LED light source sub-array emits an optical beam carrying the modulated data stream, thereby realizing the switching of the optical beam carrying the data stream.
In the above technical scheme, as shown in Fig. 4, the receiving antenna unit includes one
receiving antenna, one band-pass filter, one low noise amplifier, one mixer, one local
oscillator and one A/D converter, and is used for receiving the identification information
selected by the transmitter uplink subsystem. As shown in Fig. 5, the data modulation
unit includes one switch decider, one modulator and one power divider, wherein the
switch decider outputs one path of identification information as multiple paths of
identical identification information, and the modulator and the power divider output one
path of data stream as multiple paths of identical modulated data streams.
According to actual needs, the above-mentioned visible light communication planar
transmitter with switchable optical beams can be further optimized or/and improved:
As shown in Fig. 6, the driving circuit includes one switch module and one bias tee, and
each switch module corresponds to a kind of identification information, the identification
information controls the switch module to open, the switch module is connected with the
bias tee, and the switch module controls the bias tee to load the modulated data stream.
In the above technical scheme, the identification information includes the total number of
optical beams and identification numbers, each switch module corresponds to an
identification number, and the identification number controls the switch module to open, for example, the identification number is a binary code, and the binary code of the switch module is the same as its corresponding identification number. If the identification number acquired by the switch module is the same as the binary code of the switch module itself, the switch module is opened. The modulated data stream is loaded to the
LED light source sub-array by the bias tee. If the identification number obtained by the
switch module is different from the binary code of the switch module itself, the
modulated data stream cannot be loaded to the LED light source sub-array, and the LED
light source sub-array can only obtain the DC driving signal sent by the bias tee.
As shown in Fig. 7, the uplink subsystem includes photodetectors, amplifiers,
comparators, digital modulators, D/A converters, radio frequency modulators and
transmitting antennas, which are connected in sequence to receive optical beams carrying
identification information and transmit radio frequency signals carrying selected
identification information.
Embodiment 2, as shown in Fig. 8, the communication method based on the switchable
visible light communication transmitter is characterized by comprising:
Si, each driving circuit controls the corresponding LED light source sub-array to emit
optical beams carrying identification information, wherein each optical beam carrying
identification information points to different directions respectively, and the identification
information carried by each optical beam is different.
S2, the transmitter uplink subsystem receives optical beams carrying identification
information, records the optical signal strength of each optical beam and the identification
information carried by each optical beam, obtains the queuing order of the strength of the optical signal, selects one or two optical beams with the highest optical signal strength, and sends the corresponding identification information to the basic data transceiving unit.
S3, the receiving antenna unit receives the identification information sent by the
transmitter uplink subsystem, the digital demodulator demodulates to obtain the
identification information, and the data modulation unit outputs a plurality of identical
identification information and a plurality of identical modulated data streams to each
driving circuit, wherein the number of the identification information, the modulated data
streams and the driving circuits is the same.
S4, each driving circuit obtains one identification information and one modulation data
stream, starts the corresponding driving circuit through the identification information,
loads the modulation data stream to the corresponding LED light source sub-array, and
the LED light source sub-array emits optical beams carrying the modulation data stream.
In the above technical scheme, the LED light source sub-array emits optical beams
carrying identification information, wherein the identification information can come from
the switch module in the corresponding driving circuit, and all the optical beams
sequentially broadcast the carried identification information to the range covered by the
visible light communication cell in a time multiplexing manner.
In the above technical scheme, steps S2 and S3 sort all received optical beams according
to optical signal strength, select one or two optical beams with the highest optical signal
strength, load modulated data streams into one or two optical beams with the highest
optical signal strength through each driving circuit, and load DC driving signals into
other optical beams, thus ensuring illumination, realizing optical beam switching at the
same time, and enhancing the optical beam quality received by the transmitter uplink subsystem, so that the transmitter uplink subsystem of the user terminal can be located at any position in the visible light communication cell.
According to actual needs, the communication method of the above-mentioned
switchable optical beam visible light communication planar transmitter can be further
optimized or/and improved:
As shown in Fig. 9, the transmitter uplink subsystem receives optical beams carrying
identification information and judges whether all optical beams carrying identification
information transmitted by all LED light source sub-arrays are received, including:
S211, the transmitter uplink subsystem receives optical beams carrying identification
information for the first time, and records the optical signal intensity and identification
information of the optical beams. According to the identification information, the total
number Noptical beams emitted by the LED light source array is confirmed, wherein the
identification information includes the total number of optical beams and the
identification number. Noptical beams is the same as NLED light source sub-arrays.
S212, the transmitter uplink subsystem continues to receive the optical beam with
identification information, records the optical signal strength and identification
information of the optical beam, and updates the queuing order of the optical signal
strength.
S213, judging whether the number of recorded identification information is less than
Noptical beams. If the response is no, stop receiving optical beams, and keep the recorded
optical signal strength, identification information and the strong and weak queuing order
of optical signal strength. If the response is yes, the recording times are increased by 1 to
judge whether the recording times reach the maximum value.
S214, judging whether the recording times reach the maximum value or not, if the
response is yes, stop receiving optical beams, and keep the recorded optical signal
strength, identification information and the strong and weak queuing order of the optical
signal strength. If the response is no, the transmitter uplink subsystem continues to
receive the optical beam carrying the identification information.
In the step S211 of the above technical scheme, because NLED light source sub-arrays is the total
number of LED light source sub-arrays, and each LED light source sub-array is one LED
light source, Noptical beams is the same as NLED light source sub-arrays.
In step S212 of the above technical scheme, the transmitter uplink subsystem continues to
receive the optical beam carrying the identification information, records the optical signal
strength and identification information of the optical beam, and updates the queuing order
of the optical signal strength. In this process, if the currently recorded identification
information is the same as the already recorded identification information, the currently
recorded identification information will be automatically discarded. At the same time,
every time the optical signal intensity is recorded, the optical signal intensity is compared
with all the optical signal intensities in the existing strong and weak queuing order,
thereby updating the whole strong and weak queuing order of optical signal intensity.
In step S214 of the above technical scheme, if the number of recorded identification
information is less than Noptical beams and the recording times reach the maximum value, the
optical beam reception is stopped, and it is confirmed that the identification information
is missing, and the optical beam corresponding to the missing identification information
may be blocked, so that the downlink visible light communication link cannot be provided. At this time, the recorded optical signal strength and identification information are retained.
Since all optical beams broadcast the carried identification information cyclically to the
range covered by the visible light communication cell in a time multiplexing manner in
turn, the maximum recording times correspond to the time threshold of the cyclic
broadcasting to the range covered by the visible light communication cell in a time
multiplexing manner.
As shown in Fig. 10, the transmitter uplink subsystem selects one or two optical beams
with the highest optical signal strength according to the queuing order of the optical
signal strength, including:
S221, acquire the optical signal intensity Poptical beam i at the first position and the optical
signal intensity Poptical beam 2 at the second position in the strong and weak queuing order of
optical signal intensity, and judge whether the absolute value of the difference between
Poptical beam i and Poptical beam 2 is greater than APthreshold value.
S222, if the response is yes, the identification information of the optical beam
corresponding to the opticalsignalintensityPoptical beam I is sent to the basic data
transceiving unit.
S223, if the response is no, the identification information of the optical beam
corresponding to the two optical signal strengths Poptical beam i and Poptical beam 2 is sent to the
basic data transceiving unit.
In the above technical scheme, when the transmitter uplink subsystem sends the
identification information to the basic data transceiving unit, it can encode the identification information and send it to the basic data transceiving unit in the form of radio frequency signals.
As shown in Fig. 11, the identification information starts the corresponding driving
circuit, which loads the modulated data stream to the corresponding LED light source
sub-array, and the LED light source sub-array emits optical beams carrying identification
information, including:
S41, the receiving antenna unit receives the identification information sent by the
transmitter uplink subsystem, the digital demodulator demodulates to obtain the
identification information, the data modulation unit receives the data stream and the
identification information, and outputs multiple identical identification information and
multiple identical modulated data streams to each driving circuit, wherein the number of
identification information, modulated data stream and driving circuit is the same.
S42, each driving circuit obtains one path of identification information and one path of
modulation data stream, and the identification information is matched with the switch
module in the driving circuit.
S43, the switch module with successful matching is started, and the modulation data is
loaded into the corresponding LED light source sub-array through the bias tee. The LED
light source sub-array emits the light beam loaded with the modulation data stream. The
other switch modules that fail to match are not started, and the corresponding LED light
source sub-array emits the light beam loaded with DC driving signal.
Embodiment 3, as shown in Fig. 12, the scene is covered by one square visible light
communication planar emitter, which is provided with four LED light source sub-arrays,
and each LED light source sub-array emits single non-Lambert non-circularly symmetric optical beam (the azimuth angles of the optical beams of each LED light source sub-array are respectively (0180), (450 225), (90° 270°) and (135° 315). The single non
Lambert non-circularly symmetric optical beam emitted by each LED light source sub
array can enhance the directional optical beam of the transmitter uplink subsystem (i.e.,
the user) in the visible light communication cell. Compared with the traditional Lambert
optical beam, more optical power can be concentrated in the local area where the
transmitter uplink subsystem (i.e., the user) is located.
Embodiment 4, as shown in Figs. 13, 14, 15, the scene is covered by the rectangular
visible light communication planar emitters, and the scene has two visible light
communication planar emitters, each of which is composed of four LED sub-arrays. Each
LED light source sub-array emits single non-Lambert non-circularly symmetric optical
beam, and the azimuth angles of the optical beams corresponding to the four LED light
source sub-arrays are respectively (0180), (45 225), (900 270) and (1350 3150). The
configuration of two visible light communication planar emitters makes the
communication coverage of edge position more sufficient in this scene.
As shown in Fig. 14, when the user is at the edge position, a plurality of optical beams
emitted by two LED light source sub-arrays with optical beam azimuth angles of (135
315) and (450 225) can be received. According to the switchable mode, two optical
beams are selected for communication, that is, users receive two optical beams carrying
data streams at the same time.
As shown in Fig. 15, when a user is in the middle of two visible light communication
planar emitters, he can receive multiple optical beams emitted by LED light source sub
arrays with beam azimuth angles of (45 2250) and (1350 3150). According to the switchable mode, one or two optical beams are selected for communication, that is, the user respectively chooses to receive one optical beam carrying data stream, and can also receive two optical beams carrying data stream at the same time.
Embodiment 5, as shown in Fig. 16, the scene is covered by the square visible light
communication planar emitter, and the arrangement of LED light source sub-arrays no
longer adopts the square arrangement in Embodiment 3. Considering the actual situation,
all LED light source sub-arrays can be arranged in a triangular shape. And the number of
LED light source sub-arrays can be reasonably confirmed according to the size of the
lamp, and then the azimuth angle of the optical beam can be confirmed, so that the
coverage can be realized and the beam can be switched at the same time.
Embodiment 6, as shown in Fig. 17, the scene is covered by the square visible light
communication planar emitter, but the sub-array arrangement of LED light sources no
longer adopts the square arrangement of Embodiment 3. Considering the actual lighting
intensity, all LED light source sub-arrays can be arranged in a square shape. And the
number of LED light source sub-arrays can be reasonably confirmed according to the size
of the lamp, and then the azimuth angle of the optical beam can be confirmed, so that the
coverage can be realized and the beam can be switched at the same time.
Embodiment 7, as shown in Fig. 18, the scene is covered by the circular visible light
communication planar emitter, and all LED light source sub-arrays can be arranged in a
circle considering the actual illumination intensity of light sources. And the number of
LED light source sub-arrays can be reasonably confirmed according to the size of the
lamp, and then the azimuth angle of the optical beam can be confirmed, so that the
coverage can be realized and the beam can be switched at the same time.
The above technical features constitute the embodiments of the present invention, which
has strong adaptability and implementation effect, and can increase or decrease
unnecessary technical features according to actual needs to meet the needs of different
situations.
Claims (10)
1. A switchable optical beams based visible light communication transmitter,
characterized by comprising one insulating shell, one transmitter uplink subsystem, one
basic data transceiving unit and one transmitter downlink subsystem.
The transmitter downlink subsystem comprises one planar basic circuit board arranged
outside the bottom of the insulating shell, a plurality of LED light source sub-arrays
arranged on the planar basic circuit board and a plurality of driving circuits arranged
inside the insulating shell, wherein the number of the driving circuits is the same as that
of the LED light source sub-arrays and corresponds to each other, and the driving circuits
control the corresponding LED light source sub-arrays to emit optical beams carrying
identification information or optical beams carrying modulated data streams, and the
optical beams carrying identification information emitted by each LED light source sub
array respectively point to different directions.
The transmitter uplink subsystem receives optical beams carrying identification
information, records the optical signal strength of each optical beam and the identification
information carried by each optical beam, obtains the strong and weak queuing order of
optical signal strength, selects one or two optical beams with the highest optical signal
strength, and sends the corresponding identification information to the basic data
transceiving unit.
The basic data transceiving unit comprises one receiving antenna unit, one digital
demodulator and one data modulation unit which are arranged inside the insulating shell,
wherein the receiving antenna unit receives identification information sent by the
transmitter uplink subsystem, the digital demodulator demodulates to obtain the identification information, and the data modulation unit outputs a plurality of identical identification information and a plurality of identical modulated data streams to each driving circuit, and the numbers of the identification information, the modulated data streams and the driving circuits are the same.
2. The switchable optical beams based visible light communication transmitter according
to claim 1, characterized in that the driving circuit comprises one switch module and one
bias tee, and each switch module corresponds to an identification information, the
identification information controls the switch module to open, the switch module is
connected with the bias tee, and the switch module controls the bias tee to load the
modulated data stream.
3. The switchable optical beams based visible light communication transmitter according
to claim 1, characterized in that the uplink subsystem comprises one photodetector, one
amplifier, one comparator, one digital modulator, one D/A converter, one radio frequency
modulator and one transmitting antenna, wherein the photodetector, the amplifier, the
comparator, the digital modulator, the D/A converter, the radio frequency modulator and
the transmitting antenna are sequentially connected to receive optical beams carrying
identification information and transmit radio frequency signals carrying selected
identification information.
4. The switchable optical beams based visible light communication transmitter according
to claim 1, characterized in that the LED light source sub-array is an LED light source
emitting single non-Lambert non-circularly symmetric optical beam.
5. The switchable optical beams based visible light communication transmitter according
to any one of claims 1-4, characterized in that the identification information comprises the total number of optical beams and an identification number, and the identification number is a binary identification number.
6. The communication method of the switchable optical beams based visible light
communication transmitter according to any one of claims 1-5, characterized by
comprising:
Each driving circuit controls the corresponding LED light source sub-array to emit
optical beams carrying identification information, wherein each optical beam carrying
identification information points to different directions respectively, and the identification
information carried by each optical beam is different.
The transmitter uplink subsystem receives optical beams carrying identification
information, records the optical signal intensity of each optical beam and the
identification information carried by it, obtains the queuing order of the intensity of
optical signals, selects one or two optical beams with the highest optical signal intensity,
and sends the corresponding identification information to the basic data transceiving unit.
The receiving antenna unit receives the identification information sent by the transmitter
uplink subsystem, the digital demodulator demodulates to obtain the identification
information, and the data modulation unit outputs multiple identical identification
information and multiple identical modulated data streams to each driving circuit,
wherein the number of identification information, modulated data streams and driving
circuits is the same.
Each driving circuit obtains one path of identification information and one path of
modulated data stream, starts the corresponding driving circuit through the identification
information, loads the modulated data stream to the corresponding LED light source sub- array, and the LED light source sub-array emits optical beams carrying the modulated data stream.
7. The communication method of the switchable optical beams based visible light
communication transmitter according to claim 6, characterized in that the transmitter
uplink subsystem receives optical beams carrying identification information, and judging
whether all optical beams carrying identification information transmitted by all LED light
source sub-arrays are received, comprises:
The transmitter uplink subsystem receives optical beams carrying identification
information for the first time, and records the optical signal intensity and identification
information of the optical beams. According to the identification information, the total
number Noptical beams emitted by the LED light source array is confirmed, wherein the
identification information includes the total number of optical beams and the
identification number. Noptical beams is the same as NLED light source sub-array.
The transmitter uplink subsystem continues to receive the optical beam with
identification information, records the optical signal strength and identification
information of the optical beam, and updates the queuing order of the optical signal
strength.
Judging whether the number of recorded identification information is less than Noptical
beams. If the response is no, stop receiving optical beams, and keep the recorded optical
signal strength, identification information and the strong and weak queuing order of
optical signal strength. If the response is yes, the recording times are increased by 1 to
judge whether the recording times reach the maximum value.
Judging whether the recording times reach the maximum value or not, if the response is
yes, stop receiving optical beams, and keep the recorded optical signal strength,
identification information and the strong and weak queuing order of the optical signal
strength. If the response is no, the transmitter uplink subsystem continues to receive the
optical beam carrying the identification information.
8. The communication method of the switchable optical beams based visible light
communication transmitter according to claims 6 or 7, characterized in that the
transmitter uplink subsystem selects one or two optical beams with the highest optical
signal strength according to the queuing order of optical signal strength, comprising:
Acquire the optical signal intensity Poptical beam i at the first position and the optical signal
intensity Poptical beam 2 at the second position in the strong and weak queuing order of
optical signal intensity, and judge whether the absolute value of the difference between
Poptical beam i and Poptical beam 2 is greater than APthreshold value.
If the response is yes, the identification information of the optical beam corresponding to
the optical signal intensity Poptical beam I is sent to the basic data transceiving unit.
If the response is no, the identification information of the optical beam corresponding to
the two opticalsignalstrengthsPoptical beam i and Poptical beam 2 is sent to the basic data
transceiving unit.
9. The communication method of the switchable optical beams based visible light
communication transmitter according to any one of claims 6-8, characterized in that the
identification information starts the corresponding driving circuit, and the driving circuit
loads the modulated data stream to the corresponding LED light source sub-array, and the
LED light source sub-array emits the optical beam carrying the identification
information, comprising:
The receiving antenna unit receives the identification information sent by the transmitter
uplink subsystem, the digital demodulator demodulates to obtain the identification
information, the data modulation unit receives the data stream and the identification
information, and outputs a plurality of identical identification information and a plurality
of identical modulated data streams to each driving circuit, wherein the number of the
identification information, the modulated data stream and the driving circuit is the same.
Each driving circuit obtains one identification information and one modulation data
stream, and the identification information is matched with the switch module in the
driving circuit.
Activating the switch module which is successfully matched, loading the modulated data
stream to the corresponding LED light source sub-array, and emitting optical beams
loaded with the modulated data stream. Other switch modules with unsuccessful
matching are not activated, and the corresponding LED light source sub-arrays emit
optical beams loaded with DC driving signals.
10. The communication method of the switchable optical beams based visible light
communication transmitter according to any one of claims 6-9, characterized in that when
the transmitter uplink subsystem sends the identification information to the basic data
transceiving unit, it encodes the identification information and sends it to the basic data
transceiving unit in the form of radio frequency signals.
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| Application Number | Priority Date | Filing Date | Title |
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| AU2021104252A AU2021104252A4 (en) | 2021-07-16 | 2021-07-16 | A switchable optical beams based visible light communication transmitter and communication method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021104252A AU2021104252A4 (en) | 2021-07-16 | 2021-07-16 | A switchable optical beams based visible light communication transmitter and communication method |
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ID=77274292
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