公开(公告)号：US20190326997A1

公开(公告)日：2019-10-24

申请号：US16069844

申请日：2016-11-28

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min JANG ,  Van Trang NGUYEN ,  Chang Hyun HONG

IPC: H04B10/556 ,  H04B10/116

Abstract: A DSM-PSK optical wireless transmission method includes the steps of: receiving a binary data signal, allowing a modulator to convert the binary data signal into a global phase shift signal, generating a reference signal group including M number of pulse signals having the same period, the same duty ratio of d/M, mutually different phases, and a determined sequence, generating a data signal group including M number of pulse signals having a determined sequence, the pulse signals having been obtained by phase-shifting the reference signal group according to the global phase shift signal, flickering each light source of a reference light source group including M number of light sources having a determined sequence, according to each pulse signal of the reference signal group, and flickering each light source of a data light source group including M number of light sources having a determined sequence, according to each pulse signal of the data signal group.

公开(公告)号：US20180159624A1

公开(公告)日：2018-06-07

申请号：US15551561

申请日：2016-01-15

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min JANG ,  Van Nguyen TRANG ,  Chang Hyun HONG

IPC: H04B10/116 ,  H04B10/556 ,  H04N5/353 ,  H04B10/67

CPC classification number: H04B10/116 ,  H04B10/5563 ,  H04B10/676 ,  H04N5/3532

Abstract: The present invention relates to an image sensor communication (ISC) system and method for enabling communication between an LED and a rolling shutter camera using a rolling shutter modulation method. The image sensor communication system according to an embodiment of the present invention comprises: a coding unit for coding transmission data to be transmitted; an LED which is turned on/off according to the transmission data coded in the coding unit; a rolling shutter camera for continuously photographing, at each of a plurality of rows in a rolling shutter manner, on/off images according to the on/off of the LED; an image processing unit for generating brightness signals according to brightness values of the on/off images of the LED photographed at each of the plurality of rows by the rolling shutter camera; and a data extraction unit for extracting the transmission data from the brightness signals of the on/off images of the LED generated by the image processing unit.

公开(公告)号：US20190356385A1

公开(公告)日：2019-11-21

申请号：US16069822

申请日：2016-11-28

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min JANG ,  Van Trang NGUYEN ,  Chang Hyun HONG

IPC: H04B10/116 ,  H04B10/556 ,  H04B10/67 ,  H04N7/22

Abstract: An optical wireless communication apparatus includes: a modulator for generating a reference signal including periodically repeating binary zeros and ones, receiving an input of a first binary data signal, and outputting a second binary data signal, wherein the second binary data signal has the same frequency as the reference signal, and has the same phase as the reference signal when the first binary data signal comprises binary zeros and has an opposite phase to the reference signal when the first binary data signal comprises binary ones, or has the same phase as the reference signal when the first binary data signal comprises binary ones and has an opposite phase to the reference signal when the first binary data signal comprises binary zeros, and a transmitter for turning a first light source on or off according to the reference signal, and turning a second light source on or off according to the second binary data signal.