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Submission
doc.: IEEE 802.15-15-0243-007a
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Kookmin University Response to 15.7r1 CFA: Applications of OCC]
Date Submitted: [March, 2015]
Source: [Md. Shareef Ifthekhar, Trang Nguyen, Nirzhar Saha, Nam Tuan Le, Mohammad Arif Hossain,
Chang Hyun Hong and Yeong Min Jang]
[Kookmin University]
Address [Kookmin University, Seoul, Korea]
Voice:[82-2-910-5068], FAX: [82-2-910-5068], E-Mail:[yjang@kookmin.ac.kr]
Re: []
Abstract:
Purpose: Call for Application Response
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for
discussion and is not binding on the contributing individual(s) or organization(s). The material
in this document is subject to change in form and content after further study. The contributor(s)
reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE
and may be made publicly available by P802.15.
March 2015
Yeong Min Jang, Kookmin University
Submission
doc.: IEEE 802.15-15-0243-007a March 2015
Slide 2
Kookmin University Response to 15.7r1 CFA:
Applications of OCC
Yeong Min Jang
yjang@kookmin.ac.kr
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 3
March 2015
Contents
Data decoding procedure of OCC
OCC issues to be solved
Optical MIMO
D2D based display to display communication
Conclusion
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 4
March 2015
Data Decoding Procedure of OCC
1s
1/30s
#1 #2 #30 #29 ….. …..
#15
Frame sampling
LED must transmit more than
100 Hz to avoid flickering
Commercially available
camera frame rate 30
frames/sec
Proposed block diagram for OCC system
Data decoding procedure
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 5
March 2015
OCC Issues to be solved
Uplink transmission development with reliable and simultaneous communication:
IR based uplink, LED Flash, and Smart Phone Screen
Line-of-sight interruption problem
Need to improve link switching scheme for seamless connectivity
Cell overlap region:
Could communicate in two adjacent cell overlap region using subcarrier modulation
Need link switching
Backhaul network & Supporting network:
Light fixture needs to plugged into wire network
Power line communication (PLC)
VLC-IR combination for downlink-uplink communication
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 6
March 2015
Optical MIMO
Low data rate due to low frame rate can be overcome using optical MIMO
Spatial separation of multiple LED at receiver side
Transmitter:
Multiple arrays of LEDs
should be considered
Each LED or group of
LEDs can be used as
transmitting antenna.
Receiver:
Either camera or image
sensor (IS) can be used as
receiver
Transmitter Receiver
M
N
Image Sensor
Plane
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 7
March 2015
802.15.7r1 (Various)
Challenges for MIMO OCC System Combining multiplexing and diversity for OCC
Objective: Capacity enhancement (for speed) and robust communication link (for
reliability)
Problem: To achieve optimum gain when both diversity and multiplexing are
combined
Remark: To introduce MIMO coding schemes (V-BLAST and STBC) into OCC
Spatial Separation of pixels (channels)
Objective: Distinguish the multi-channel by successful pixel separation
Problem: Pixels may overlap and result inter-symbol interference
Remark: Efficient algorithm to distinguish pixel. Selection and combining schemes
(e.g. MRC, generalized selection combining etc.) can be used in OCC to select
channels (pixels) with highest SNR values
Transmitter and receiver alignment problem
Objective: To increase the number of rank of the channel matrix
Problem: Placing receiver in corner of the room reduce the channel rank to one,
therefore it is impossible to achieve diversity as well as multiplexing
Remark: To introduce angle diversity and tilting receiver arrangement
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 8
March 2015
MIMO OCC and multi-colors transmission
(a) Angle of Capturing (b) Perspective Distortion
Design of LEDs transmitter to mitigate
Perspective Distortion:
16x16 LEDs Transmitter with 8 colors used
Multiple colors transmission in MIMO
system
Interference between color channels
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 9
March 2015
MIMO OCC and multi-colors transmission
OCC Transmitter OCC Receiver
User Interface of multi colors-MIMO-OCC transmitter
PC application of Screen-to-Camera
Smartphone application of Screen-to-Camera
OCC Transmitter
Data rate = 3 bits x (16 x16 LEDs) x 2/3 x 30(fps)
= 15360 [bps] = 15 [kbps]
Asynchronous Scheme is applied to mitigate Variation in Camera frame rate
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 10
March 2015
D2D based Display-to-Camera Communication
front-Camera
Screen
Encoder
Image processing
Decoder
Data to transmit
Received Data
Syn
ch
ron
ize
an
d
Co
ntr
ol
Device #1 Device #2 Bidirectional Communications of Transceiver-to-Transceiver:
• Uplink: Transmit data using Screen
• Downlink: Receive data using front-Camera
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 11
March 2015
D2D based Display-to-Camera Communication
Unidirectional D2D Communications using Display-to-Camera
Optical link
One-way Communications with
• Transmitter: Screen of Device #1
• Receiver: Camera of Device #2
Submission
doc.: IEEE 802.15-15-0243-007a
Slide 12
March 2015
802.15.7r1 (Various)
Conclusion
OCC will be the new paradigm in the IEEE 802.15.7r1 OWC
Need PHY for bidirectional and unidirectional communication
Need to solve pixel overlap issues due to perspective distortion to
support MIMO
Need some directions for switching between multiplexing and
diversity mode in MIMO