CN110098871B - Working method of indoor VLC multi-stream spatial modulation system based on color space - Google Patents

Working method of indoor VLC multi-stream spatial modulation system based on color space Download PDF

Info

Publication number
CN110098871B
CN110098871B CN201910379114.4A CN201910379114A CN110098871B CN 110098871 B CN110098871 B CN 110098871B CN 201910379114 A CN201910379114 A CN 201910379114A CN 110098871 B CN110098871 B CN 110098871B
Authority
CN
China
Prior art keywords
signal
transmitting
receiving
color
modulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910379114.4A
Other languages
Chinese (zh)
Other versions
CN110098871A (en
Inventor
白智全
郭蒙
庞珂
杨颖超
寇晓辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong University
Original Assignee
Shandong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong University filed Critical Shandong University
Priority to CN201910379114.4A priority Critical patent/CN110098871B/en
Publication of CN110098871A publication Critical patent/CN110098871A/en
Application granted granted Critical
Publication of CN110098871B publication Critical patent/CN110098871B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse 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
    • H04B10/541—Digital intensity or amplitude modulation

Abstract

A working method of an indoor VLC multi-stream spatial modulation system based on a color space belongs to the field of wireless optical communication. This scheme utilizes the color space provided by the laser diode LD consisting of four colored laser sources to carry the information bits. The communication process of the system is divided into three steps, firstly, information bits of a sending end are converted into three parts through serial-parallel conversion and enter a signal modulation module, the first part is used for selecting an LD activation mode, the second part is mapped into a PAM modulation signal, the two parts are jointly mapped into a modulation signal s, the third part is mapped into a color signal s' of an LD, the three parts jointly form a sending signal x and the selected LD is sent to a receiving end through a visible light channel, and finally the receiving end demodulates the received signal by adopting a maximum likelihood detection method to restore an original signal. The scheme utilizes the freedom degrees of the color domain and the space domain, effectively improves the transmission rate of the system and perfects the performance of the system.

Description

Working method of indoor VLC multi-stream spatial modulation system based on color space
Technical Field
The invention relates to a working method of an indoor VLC multi-stream spatial modulation system based on a color space, and belongs to the field of wireless optical communication.
Background
In recent years, with the vigorous development of communication technology in China, the demand of terminal users is increasing, and users have higher requirements on the speed and quality of wireless transmission, so that the spectrum resources in the communication field are increasingly in short supply. As a novel wireless communication technology, a Visible Light Communication (VLC) technology has the advantages of high communication capacity, large transmission bandwidth, high transmission rate, strong anti-interference capability, good confidentiality and the like, and a VLC system has two functions of illumination and communication, so that the illumination function of the system needs to be ensured while data transmission is performed. The Space Modulation (SM) technology is used as a novel Multiple Input Multiple Output (MIMO) transmission technology, one antenna is activated at a transmitting end to transmit data, so that the problems of inter-channel interference (ICI) and inter-antenna synchronization (IAS) can be effectively avoided, and the spectrum efficiency is greatly improved while the advantages of the SM are maintained by Generalized Space Modulation (GSM), so that the MSM has great research value in VLC communication. In recent years, Laser Diodes (LDs) have been proposed to replace Light Emitting Diodes (LEDs) due to their higher power efficiency in lighting and communications, where the bandwidth of the LDs is about 10 times that of the LEDs, and higher bit rates can be achieved. In addition, high optical power and convergence of the beam make LDs more popular than LEDs. The LD takes red, green, yellow and blue four colors as light sources, can provide higher transmission rate, has no flicker, and has stable luminous intensity. The indoor VLC multi-stream spatial modulation system based on the color space makes full use of the visible light communication technology and the generalized spatial modulation technology, effectively improves the performance of the system, can further improve the transmission rate of the system, and is a research hotspot in the technical field of current wireless light communication transmission.
R.mesleh et al (see r.mesleh, r.mehmod, h.elgala, and h.haas, "Indoor MIMO optical wireless communication using modulation," proc.ieee ICC 2010, pp.1-5, May 2010) introduces SM as a simplified MIMO scheme that provides higher transmission rates by carrying transmission information bits on specific antenna indices as compared to MIMO systems. In order to further improve the spectral efficiency of SM, s.p. alaka et al (see s.p. alaka, t.l. narasiman and a.chockalingap, "Generalized Spatial Modulation in Indoor Wireless Visible Light Communication," in proc.ieee GLOBECOM, pp.1-7, dec.2015) proposed an Indoor VLC scheme based on GSM, derived the theoretical upper bound of the error rate of the GSM maximum likelihood detection in VLC system, analyzed that the performance of the VLC scheme based on GSM is significantly better than other MIMO schemes in case of high signal to noise ratio. An Enhanced SM VLC system is proposed in y.shan et al (see y.shann, m.li, and m.jin, "Enhanced Spatial Light Communication", journal.of inf.and comm.conv.eng., vol.13, pp.1-6, mar.2015) that activates two LEDs simultaneously, thereby reducing the intensity level of Pulse Amplitude Modulation (PAM), analyzing the performance of the system at high and low correlation channels, respectively, which improves system performance compared to conventional optical Spatial Modulation schemes. The above schemes are limited in terms of transmission rate and spectrum efficiency of the system, respectively, and cannot effectively improve the performance of the system.
Disclosure of Invention
According to the defects and shortcomings of the prior art and solutions, the working method of the indoor VLC multi-stream spatial modulation (CS-MSM) system based on the color space is stronger in adaptability and better in performance.
The technical scheme of the invention is as follows:
a working method of an indoor VLC (visible light communication) multi-stream spatial modulation system based on a color space comprises NtA transmitting laser diode LD and NrEach receiving photoelectric detector PD is composed of laser sources of four colors of red, green, yellow and blue, and the data transmission process is mainly divided into three steps: first, input information bits are converted from serial to parallel into three parts, the first part is used to select NaA transmitting LD, wherein 1 is not more than Na≤Nt(ii) a The second part is mapped to an M-order light-weighted modulation signal (PAM signal) expressed by
Figure GDA0002993492960000021
m and I are respectively the light intensity level number and the average light power, and the first two parts are jointly mapped into a modulation signal s; the third part is mapped to the color signal s' of the LD, and the three parts jointly form a sending signal x; then by the selected NaThe LD transmits x to the PD at the receiving end through a visible light channel; finally, the receiving end demodulates and restores the received signal of the PD to obtain an original signal, and the method specifically comprises the following steps:
1) first, the sending end will
Figure GDA0002993492960000022
The bit information is converted into three parts by serial-parallel grouping to enter the signal modulation of the transmitting endModule of which symbols
Figure GDA0002993492960000023
Respectively representing a down rounding operation and a binomial coefficient operation; front side
Figure GDA0002993492960000024
One bit of information is used to select NaA transmission LD, Nalog2M bit information is used for mapping into an M-order PAM signal, and then the two parts are jointly mapped into a modulation signal s; last 2NaThe bit information is used for selecting one color of four laser sources of the transmitting LD, namely mapping the color into a signal s ', and then multiplying x ═ ss ', namely s and s ', to obtain a transmitting signal x;
2) in a visible light channel, the energy of a line-of-sight link, that is, an LOS link signal, is much larger than that of a spread link signal, only channels under the LOS link are considered, and assuming that a transmitting end is completely synchronous, a signal received at a receiving end is represented as y-rHx + w-rH (ss ') + w, where x is a transmission signal, s is a joint modulation signal, and s' is a color signal; r is a photoelectric conversion coefficient of the photodetector PD; h is an Nr×NtIs expressed as a VLC channel matrix of
Figure GDA0002993492960000025
hijIs VLC channel coefficient expressed as
Figure GDA0002993492960000026
Wherein A denotes an effective receiving area of a receiving-end photodetector, dijIndicates the effective distance, phi, from the jth transmitting LD to the ith receiving PDijRepresents the top view angle from the jth transmission LD to the ith reception PD,
Figure GDA0002993492960000027
Represents the elevation angle from jth sending LD to ith receiving PD, and m' represents Lambert radiation number of the sending end, and the expression is
Figure GDA0002993492960000028
Wherein phi1/2Denotes the power half angle, Ψ, of the transmitting LDcRepresents the angle of view of the receiving PD; w represents the channel noise from the transmitting end to the receiving end;
3) the receiving end utilizes a maximum likelihood detection algorithm to the received signal of the PD, and the expression is
Figure GDA0002993492960000029
Detecting and demodulating to recover the original signal, wherein the symbol | · | | non-woven phosphorF、
Figure GDA00029934929600000210
argmin respectively represents the F-norm of the matrix, the square of the F-norm of the matrix and the minimum value, and the expression represents that the transmitted signal with the minimum distance between the received signal and all the transmitted signals is the detected signal;
Figure GDA00029934929600000211
the theoretical expression of the symbol error rate of the system under the VLC channel, which is obtained by derivation analysis of the transmitting signal of the transmitting end obtained by the maximum likelihood detection, is
Figure GDA00029934929600000212
Wherein
Figure GDA00029934929600000213
Indicating the number of all possible transmitted modulated signals, sqDenotes the q-th modulation signal, s'q’Representing the q' th color signal, skDenotes the k-th modulation signal, s'k’Represents the k' color signal, sigma is the noise standard deviation, Q () is the right tail function of the standard normal distribution, and the expression is
Figure GDA00029934929600000214
Where t ═ u, denotes the distance between the detection signal and the transmission signal.
Based on indoor VLC communication, the invention provides an indoor VLC multi-stream spatial modulation scheme based on color space, and compared with the traditional VLC scheme based on SM and the VLC scheme based on GSM, the scheme has higher transmission rate and spectrum utilization rate and has more obvious performance improvement.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention.
Fig. 2 is a simulation comparison diagram of the symbol error rate performance of the system of the present invention. It can be seen from fig. 2 that the symbol error rate performance in the signal-to-noise ratio range shown in the system of the present invention is significantly better than the system performance of the conventional SMVLC and GSMVLC.
Detailed Description
The present invention is further described below with reference to the following drawings and examples, but is not limited thereto.
Example (b):
a working method of an indoor VLC multi-stream spatial modulation system based on color space comprises NtA transmitting laser diode LD and NrEach receiving photoelectric detector PD is composed of laser sources of four colors of red, green, yellow and blue, and the data transmission process is mainly divided into three steps: first, input information bits are converted from serial to parallel into three parts, the first part is used to select NaA transmitting LD, wherein 1 is not more than Na≤Nt(ii) a The second part is mapped to an M-order light-weighted modulation signal (PAM signal) expressed by
Figure GDA0002993492960000031
m and I are respectively the light intensity level number and the average light power, and the first two parts are jointly mapped into a modulation signal s; the third part is mapped to the color signal s' of the LD, and the three parts jointly form a sending signal x; then by the selected NaThe LD transmits x to the PD at the receiving end through a visible light channel; finally, the receiving end demodulates and restores the received signal of the PD to obtain an original signal, and the method specifically comprises the following steps:
1) first, the sending end will
Figure GDA0002993492960000032
The bit information is converted into three parts through serial-parallel grouping to enter a signal modulation module of a sending end, wherein symbols
Figure GDA0002993492960000033
Respectively representing a down rounding operation and a binomial coefficient operation; front side
Figure GDA0002993492960000034
One bit of information is used to select NaA transmission LD, Nalog2M bit information is used for mapping into an M-order PAM signal, and then the two parts are jointly mapped into a modulation signal s; last 2NaThe bit information is used to select one color of the four laser sources of the transmitting LD, i.e. mapped as signal s ', and then multiplied by x ═ ss ', i.e. s and s ', to obtain the transmitted signal x.
2) In a visible light channel, the energy of a line-of-sight link, that is, an LOS link signal, is much larger than that of a spread link signal, only channels under the LOS link are considered, and assuming that a transmitting end is completely synchronous, a signal received at a receiving end is represented as y-rHx + w-rH (ss ') + w, where x is a transmission signal, s is a joint modulation signal, and s' is a color signal; r is a photoelectric conversion coefficient of the photodetector PD; h is an Nr×NtIs expressed as a VLC channel matrix of
Figure GDA0002993492960000035
hijIs VLC channel coefficient expressed as
Figure GDA0002993492960000036
Wherein A denotes an effective receiving area of a receiving-end photodetector, dijIndicates the effective distance, phi, from the jth transmitting LD to the ith receiving PDijRepresents the top view angle from the jth transmission LD to the ith reception PD,
Figure GDA0002993492960000037
Represents the elevation angle from jth sending LD to ith receiving PD, and m' represents Lambert radiation number of the sending end, and the expression is
Figure GDA0002993492960000038
Wherein phi1/2Indicating the work of sending LDHalf angle of power, ΨcRepresents the angle of view of the receiving PD; w represents the channel noise from the transmitting end to the receiving end;
3) the receiving end utilizes a maximum likelihood detection algorithm to the received signal of the PD, and the expression is
Figure GDA0002993492960000039
Detecting and demodulating to recover the original signal, wherein the symbol | · | | non-woven phosphorF、
Figure GDA00029934929600000310
argmin respectively represents the F-norm of the matrix, the square of the F-norm of the matrix and the minimum value, and the expression represents that the transmitted signal with the minimum distance between the received signal and all the transmitted signals is the detected signal;
Figure GDA00029934929600000311
the theoretical expression of the symbol error rate of the system under the VLC channel, which is obtained by derivation analysis of the transmitting signal of the transmitting end obtained by the maximum likelihood detection, is
Figure GDA0002993492960000041
Wherein
Figure GDA0002993492960000042
Indicating the number of all possible transmitted modulated signals, sqDenotes the q-th modulation signal, s'q’Representing the q' th color signal, skDenotes the k-th modulation signal, s'k’Represents the k' th color signal, σ is the noise standard deviation, and Q (. -) is the right tail function of the normal distribution and is represented as
Figure GDA0002993492960000043
Where t ═ u, denotes the distance between the detection signal and the transmission signal.

Claims (1)

1. A working method of an indoor VLC (visible light communication) multi-stream spatial modulation system based on a color space comprises NtA transmitting laser diode LD and NrEach receiving photoelectric detector PD is composed of laser sources of four colors of red, green, yellow and blue, and the data transmission process is mainly divided into three steps: first, input information bits are converted from serial to parallel into three parts, the first part is used to select NaA transmitting LD, wherein 1 is not more than Na≤Nt(ii) a The second part is mapped to an M-order light-weighted modulation signal (PAM signal) expressed by
Figure FDA0002993492950000011
m and I are respectively the light intensity level number and the average light power, and the first two parts are jointly mapped into a modulation signal s; the third part is mapped to the color signal s' of the LD, and the three parts jointly form a sending signal x; then by the selected NaThe LD transmits x to the PD at the receiving end through a visible light channel; finally, the receiving end demodulates and restores the received signal of the PD to obtain an original signal, and the method specifically comprises the following steps:
1) first, the sending end will
Figure FDA0002993492950000012
The bit information is converted into three parts through serial-parallel grouping to enter a signal modulation module of a sending end, wherein symbols
Figure FDA0002993492950000013
Figure FDA0002993492950000014
Respectively representing a down rounding operation and a binomial coefficient operation; front side
Figure FDA0002993492950000015
One bit of information is used to select NaA transmission LD, Nalog2M bit information is used for mapping into an M-order PAM signal, and then the two parts are jointly mapped into a modulation signal s; last 2NaThe bit information is used for selecting one color of four laser sources of the transmitting LD, namely mapping the color into a signal s ', and then multiplying x ═ ss ', namely s and s ', to obtain a transmitting signal x;
2) in a visible light channel, the energy of a line-of-sight link, that is, an LOS link signal, is much larger than that of a spread link signal, only channels under the LOS link are considered, and assuming that a transmitting end is completely synchronous, a signal received at a receiving end is represented as y-rHx + w-rH (ss ') + w, where x is a transmission signal, s is a joint modulation signal, and s' is a color signal; r is a photoelectric conversion coefficient of the photodetector PD; h is an Nr×NtIs expressed as a VLC channel matrix of
Figure FDA0002993492950000016
hijIs VLC channel coefficient expressed as
Figure FDA0002993492950000017
Wherein A denotes an effective receiving area of a receiving-end photodetector, dijIndicates the effective distance, phi, from the jth transmitting LD to the ith receiving PDijRepresents the top view angle from the jth transmission LD to the ith reception PD,
Figure FDA0002993492950000018
Represents the elevation angle from jth sending LD to ith receiving PD, and m' represents Lambert radiation number of the sending end, and the expression is
Figure FDA0002993492950000019
Wherein phi1/2Denotes the power half angle, Ψ, of the transmitting LDcRepresents the angle of view of the receiving PD; w represents the channel noise from the transmitting end to the receiving end;
3) the receiving end utilizes a maximum likelihood detection algorithm to the received signal of the PD, and the expression is
Figure FDA00029934929500000110
Detecting and demodulating to recover the original signal, wherein the symbol | · | | non-woven phosphorF、
Figure FDA00029934929500000111
The argmin representing the matrices respectivelyF-norm, square of matrix F-norm, minimum value, the expression represents that the transmitting signal with the minimum distance between the receiving signal and all the transmitting signals is the detected signal;
Figure FDA00029934929500000112
the theoretical expression of the symbol error rate of the system under the VLC channel, which is obtained by derivation analysis of the transmitting signal of the transmitting end obtained by the maximum likelihood detection, is
Figure FDA00029934929500000113
Wherein
Figure FDA00029934929500000114
Indicating the number of all possible transmitted modulated signals, sqDenotes the q-th modulation signal, s'q’Representing the q' th color signal, skDenotes the k-th modulation signal, s'k’Represents the k' th color signal, σ is the noise standard deviation, and Q (. -) is the right tail function of the normal distribution and is represented as
Figure FDA00029934929500000115
Where t ═ u, denotes the distance between the detection signal and the transmission signal.
CN201910379114.4A 2019-05-08 2019-05-08 Working method of indoor VLC multi-stream spatial modulation system based on color space Active CN110098871B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910379114.4A CN110098871B (en) 2019-05-08 2019-05-08 Working method of indoor VLC multi-stream spatial modulation system based on color space

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910379114.4A CN110098871B (en) 2019-05-08 2019-05-08 Working method of indoor VLC multi-stream spatial modulation system based on color space

Publications (2)

Publication Number Publication Date
CN110098871A CN110098871A (en) 2019-08-06
CN110098871B true CN110098871B (en) 2021-06-22

Family

ID=67447254

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910379114.4A Active CN110098871B (en) 2019-05-08 2019-05-08 Working method of indoor VLC multi-stream spatial modulation system based on color space

Country Status (1)

Country Link
CN (1) CN110098871B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111245511B (en) * 2020-01-15 2022-03-18 山东大学 Working method of self-adaptive visible light communication system based on generalized spatial modulation
CN115441954A (en) * 2022-08-04 2022-12-06 武汉邮电科学研究院有限公司 Probability shaping pulse amplitude modulation method, device and system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105072065A (en) * 2015-07-20 2015-11-18 东南大学 Precoding and drive current joint optimization method for four-color visible light communication system
CN106506079A (en) * 2016-11-29 2017-03-15 东南大学 Polarization code Optimization Design in four color visible light communication systems
WO2017188030A1 (en) * 2016-04-26 2017-11-02 富士フイルム株式会社 Image processing device and image processing method
CN108092717A (en) * 2017-12-26 2018-05-29 东莞信大融合创新研究院 A kind of multicolor visible light communication illumination and transceiver combined optimization technology

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9571312B2 (en) * 2013-11-26 2017-02-14 University Of Virginia Patent Foundation Expurgated pulse position modulation for communication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105072065A (en) * 2015-07-20 2015-11-18 东南大学 Precoding and drive current joint optimization method for four-color visible light communication system
WO2017188030A1 (en) * 2016-04-26 2017-11-02 富士フイルム株式会社 Image processing device and image processing method
CN106506079A (en) * 2016-11-29 2017-03-15 东南大学 Polarization code Optimization Design in four color visible light communication systems
CN108092717A (en) * 2017-12-26 2018-05-29 东莞信大融合创新研究院 A kind of multicolor visible light communication illumination and transceiver combined optimization technology

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Joint Colour-and-Spatial Modulation Aided Visible Light Communication System;Yufa Chen;《 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring)》;20160707;全文 *
Multi‐colour LED specified bipolar colour shift keying scheme for visible light communications;Xu Wei;《Electronics Letters》;20160101;全文 *

Also Published As

Publication number Publication date
CN110098871A (en) 2019-08-06

Similar Documents

Publication Publication Date Title
Chi et al. Visible light communication in 6G: Advances, challenges, and prospects
Le Minh et al. Indoor gigabit optical wireless communications: challenges and possibilities
CN107040310B (en) The working method of FSO communication system based on IHDAF agreement
Vučić et al. High-speed visible light communications: State-of-the-art
CN111245511B (en) Working method of self-adaptive visible light communication system based on generalized spatial modulation
CN110098871B (en) Working method of indoor VLC multi-stream spatial modulation system based on color space
CN110061777B (en) Relay cooperation indoor visible light communication method and system based on NOMA
CN103346835B (en) High speed visible light multiple-input multiple-output system and communication means thereof
CN104092518A (en) Indoor visible light MIMO transmission scheme integrating spatial modulation and space multiplexing technology
CN106452582A (en) Close-range high-speed bidirectional data transmission system based on wavelength division multiplexing RGB-LED light source
CN110474684B (en) Generalized dimming control method based on multi-LED visible light communication system
CN109981178A (en) The working method of generalized spatial modulation system based on gamut keying modulation
Ndjiongue et al. Closed-Form BER Expressions for HSV-Based ${M} $ PSK-CSK Systems
Deng et al. Software defined adaptive MIMO visible light communications after an obstruction
CN109831253B (en) Visible light MIMO antenna selection method based on multi-color CSK modulation
CN204810271U (en) Led visible light communication system
Chen et al. Joint colour-and-spatial modulation aided visible light communication system
CN110166120A (en) The two-way visible light communication system of intelligence suitable for multiple-quality water
CN115333634B (en) High-bandwidth multi-freedom-degree wireless optical communication system suitable for commercial illumination LED
CN108494484B (en) Working method of indoor VLC (visible light communication) spatial modulation system based on IHDAF (Internet short message interface) protocol
CN107181531B (en) Bit mapping method when LED number is any in light spatial modulation communication system
Xiao et al. High-Speed visible light communication chipset based multi-color MIMO system
Khan et al. Perspective on light-fidelity and visible light communication
Kong et al. A PPM-based four-dimensional modulation scheme for visible light communications
CN112332916A (en) Visible light communication system and folding fan

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant