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