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WO2018169354A1 - Système hybride occ et lifi - Google Patents

Système hybride occ et lifi Download PDF

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Publication number
WO2018169354A1
WO2018169354A1 PCT/KR2018/003104 KR2018003104W WO2018169354A1 WO 2018169354 A1 WO2018169354 A1 WO 2018169354A1 KR 2018003104 W KR2018003104 W KR 2018003104W WO 2018169354 A1 WO2018169354 A1 WO 2018169354A1
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WO
WIPO (PCT)
Prior art keywords
cells
light source
modulation scheme
photodiode
imaging
Prior art date
Application number
PCT/KR2018/003104
Other languages
English (en)
Korean (ko)
Inventor
장영민
응웬반장
Original Assignee
국민대학교 산학협력단
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 국민대학교 산학협력단 filed Critical 국민대학교 산학협력단
Priority to KR1020197029993A priority Critical patent/KR102259055B1/ko
Publication of WO2018169354A1 publication Critical patent/WO2018169354A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • H04L5/0083—Timing of allocation at predetermined intervals symbol-by-symbol

Definitions

  • the present invention relates to hybrid OCC and LiFi systems.
  • VLC Visible Light Communication
  • PD photo diode
  • OWC Optical Wirelesss Communications
  • the present inventor is leading the OWC international standardization by submitting many articles on the OWC technology as the chairman of the IEEE 802.15.7m OWC TG international standardization organization. Relates to a LiFi system.
  • the present invention provides a hybrid OCC and LiFi system.
  • a hybrid image sensor is characterized in that it comprises a plurality of imaging cells arranged on the light receiving surface, and a plurality of photo diode cells arranged on the light receiving surface.
  • the plurality of photodiode cells are arranged between the plurality of imaging cells.
  • An optical wireless receiver includes a receiver configured to receive data continuously photographing a blinking state of a light source from a hybrid image sensor including imaging cells and photodiode cells, and images captured by the imaging cells.
  • the flashing state of the light source is demodulated according to a first modulation scheme to generate RoI information
  • the blinking state of the light source photographed by the photodiode cells based on the RoI information is demodulated according to a second modulation scheme to transmit data. It characterized in that it comprises a demodulator to restore.
  • the imaging cells and photodiode cells are arranged on one light receiving surface.
  • the photodiode cells are arranged between the imaging cells.
  • the RoI information characterized in that the information on a plurality of RoI.
  • the first modulation method is characterized in that the S2-PSK method.
  • the second modulation scheme is one of DCO-OFDM and ACO-OFDM.
  • the present invention includes a computer program stored on a recording medium for executing the method according to an embodiment of the present invention on a computer.
  • the present invention includes a computer readable recording medium having recorded thereon a program for executing the method according to an embodiment of the present invention on a computer.
  • FIG. 1 is a view schematically illustrating a hybrid image sensor and an operation thereof according to an embodiment of the present invention.
  • FIG. 2 is a diagram schematically showing the configuration of an optical wireless communication system using a hybrid image sensor according to an embodiment of the present invention.
  • FIG. 3 is a view schematically showing an S2-PSK scheme using four light sources according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an example of an S2-PSK scheme using four light sources according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example in which an optical wireless transmission apparatus according to an embodiment transmits data using the S2-PSK scheme as a first modulation scheme.
  • FIG. 6 is a diagram illustrating an example in which an optical wireless transmission apparatus according to an embodiment uses a baseband modulation scheme as a second modulation scheme.
  • FIG. 7 is a diagram illustrating an example in which an optical wireless transmission apparatus according to an embodiment uses a MIMO-OFDM modulation scheme as a second modulation scheme.
  • FIG 8 and 9 are diagrams schematically showing the overall configuration of an optical wireless transmission system according to an embodiment of the present invention.
  • a hybrid image sensor includes a plurality of imaging cells and a plurality of photo diode cells arranged on a light receiving surface.
  • the plurality of photodiode cells may be arranged between the plurality of imaging cells to detect one image image with the imaging cell or with the photodiode cell.
  • Photodiode cells can detect an image only for a particular portion RoI.
  • Imaging cells may be implemented in CCD or CMOS.
  • the hybrid image sensor enables OCC communication by imaging cells and LiFi communication by photodiode cells. LiFi communication can achieve data rates above 10Gbps.
  • the optical wireless transmission apparatus 100 modulates first data by a first modulation scheme, modulates second data by a second modulation scheme, and transmits the second data through the light source 300.
  • the light source 300 may be one light source or may include a plurality of light sources.
  • the first data may be identification information of the light source 300.
  • the first data may be low speed data and the second data may be high speed data.
  • the receiver 210 of the optical wireless receiver 200 receives images from the hybrid image sensor 400 continuously photographing the blinking state of the light source 300.
  • the blinking state of the light source does not necessarily indicate only on / off, and may include all of adjusting brightness or color of the light source.
  • the demodulator 220 of the optical wireless receiver 200 restores the first data by demodulating the flashing state of the light source photographed by the imaging cells according to the first modulation method, and flashes the light source photographed by the photodiode cells.
  • the state is demodulated according to the second modulation scheme to restore the second data.
  • the optical wireless receiver 200 demodulates the flashing state of the light source photographed by the imaging cells according to the first modulation scheme to generate RoI information, and flashes the light source photographed by the photodiode cells based on the generated RoI information.
  • the state can be demodulated according to the second modulation scheme to restore the transmission data. That is, RoI is determined by the OCC method, and photodiode cells may perform high-speed data demodulation through a technique such as LiFi based on the determined RoI.
  • RoI information may be information about a plurality of RoI.
  • the first modulation scheme may be a Temporal 2-PSK, UPSOOK, S2-PSK, or SM-PSK scheme.
  • Temporal 2-PSK or UPSOOK is preferable when the light source 300 is one individual light source
  • S2-PSK is preferable when it includes two individual light sources
  • S2-PSK when it includes four individual light sources.
  • S8-PSK is preferred. Since the global shutter image sensor has a low frame rate, the low-speed data transmission may be performed using this first modulation scheme. This is particularly advantageous in a moving environment such as a car. Undersampling is an important technology for global shutter image sensor based OCC communication.
  • the Temporal 2-PSK scheme transmits pulse waves of the same phase in the continuous first and second intervals when the transmission data bit is 0, and in the continuous first and second intervals when the transmission data bit is 1. This can be achieved by transmitting pulse waves of opposite phases to each other.
  • FIG. 3 is a view schematically showing an S2-PSK scheme using four light sources according to an embodiment of the present invention.
  • the optical wireless transmission apparatus 100 may use the S2-PSK method of FIG. 3 as the first modulation method.
  • Each symbol contains two bits.
  • Each symbol may be n repetitions of (A A ') as follows.
  • FIG. 4 is a diagram illustrating an example of an S2-PSK scheme using four light sources according to an embodiment of the present invention.
  • the optical wireless transmission apparatus 100 may divide the electronic display board 300 into four parts and use each divided section as an individual light source.
  • 5 is a diagram illustrating an example in which the optical wireless transmission apparatus 100 according to an embodiment of the present invention transmits data using the S2-PSK scheme as a first modulation scheme using a tail light of an automobile.
  • the optical wireless transmission apparatus 100 according to an exemplary embodiment may use the left tail light and the right tail light of an automobile as individual light sources.
  • the second modulation scheme may be a baseband modulation scheme.
  • the second modulation scheme may include DSM-PSK, DCO-OFDM, ACO-OFDM, or DWT-OFDM.
  • the second modulation scheme may be a scheme of simultaneously using any one of DSM-PSK, DCO-OFDM, ACO-OFDM, and DWT-OFDM.
  • the second modulation scheme may include unipolar, enhanced unipolar OFDM, or flip OFDM.
  • Single carrier FDMA SC-FDMA
  • SC-FDMA Single carrier FDMA
  • FIG. 6 is a diagram illustrating an example in which the optical wireless transmission apparatus 100 according to the embodiment uses a baseband modulation method as a second modulation method.
  • FIG. 7 is a diagram illustrating an example in which the optical wireless transmission apparatus 100 according to an embodiment uses the MIMO-OFDM modulation method as the second modulation method.
  • FIGS. 8 and 9 are diagrams schematically showing the overall configuration of an optical wireless transmission system according to an embodiment of the present invention.
  • a multiple RoI based OCC signaling technique for a multi-link OCC system with multiple access is shown.
  • a light source of interest can be detected from a distance, and LiFi communication can be performed on the detected RoI to form multiple links in units of Gbps or Tbps.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un dispositif de réception sans fil optique, selon un mode de réalisation de la présente invention, qui comprend : une unité de réception pour recevoir des données, dans lesquelles l'état de papillotement d'une source de lumière est photographié en continu, à partir d'un capteur d'image hybride comprenant des cellules d'imagerie et des cellules de photodiode; et une unité de démodulation pour générer des informations de RoI par la démodulation de l'état de papillotement de la source de lumière, qui a été photographié au moyen des cellules d'imagerie, conformément à un premier schéma de modulation, et pour restaurer des données de transmission au moyen de la démodulation, conformément à un second schéma de modulation, l'état de papillotement de la source de lumière qui a été photographié au moyen des cellules de photodiode sur la base des informations de RoI.
PCT/KR2018/003104 2017-03-16 2018-03-16 Système hybride occ et lifi WO2018169354A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020197029993A KR102259055B1 (ko) 2017-03-16 2018-03-16 하이브리드 occ 및 lifi 시스템

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0033384 2017-03-16
KR20170033384 2017-03-16

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WO2018169354A1 true WO2018169354A1 (fr) 2018-09-20

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102256869B1 (ko) * 2019-12-27 2021-05-26 국민대학교산학협력단 하이브리드 광학 무선 통신 신호의 변복조 방법 및 장치
KR102412462B1 (ko) * 2020-11-23 2022-06-22 국민대학교산학협력단 S2-psk 및 ofdm에 기반한 하이브리드 파형을 이용한 통신 장치 및 통신 방법
US11496224B2 (en) 2020-11-25 2022-11-08 Kookmin University Industry Academy Cooperation Foundation Communication device for adjusting communication channel depending on optical communication environment and communication method using the same
KR102389176B1 (ko) * 2020-11-25 2022-04-20 국민대학교산학협력단 광통신 환경에 따라 통신 방식을 조절하는 통신 제어 장치 및 이를 이용한 통신 제어 방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130251374A1 (en) * 2012-03-20 2013-09-26 Industrial Technology Research Institute Transmitting and receiving apparatus and method for light communication, and the light communication system thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130251374A1 (en) * 2012-03-20 2013-09-26 Industrial Technology Research Institute Transmitting and receiving apparatus and method for light communication, and the light communication system thereof

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CHANG HYUN HONG: "Modulation and Coding Scheme (MCS) for Indoor Image Sensor Communication System", WIRELESS PERSONAL COMMUNICATION, vol. 93, 4 February 2017 (2017-02-04), pages 987 - 1003, XP036192794, DOI: doi:10.1007/s11277-017-3977-x *
JAESANG CHA: "Offset Variable Pulse Width Modulation for Smart Device Flash Light", IEEE 802.15.15-16-0026-01-007A, January 2016 (2016-01-01), pages 3 - 8, XP068105500 *
JEON, CHANWOO ET AL.,: "A Hybrid Wireless Optical Communication for both VLC & OCC", PROCEEDINGS OF THE KOREAN INSTITUTE OF COMMUNACATIONS AND INFORMATION SCIENCES (KICS), June 2015 (2015-06-01), pages 1465 - 1466 *
MOHAMED SUFYAN ISLIM: "Modulation Techniques for Li-Fi", ZTE COMMUNICATIONS, vol. 14, 13 April 2016 (2016-04-13), pages 29 - 40, XP055608745 *

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KR20190122852A (ko) 2019-10-30
KR102259055B1 (ko) 2021-06-01

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