experimental tests for outage analysis in siso li-fi indoor … · 2017-08-30 · motivation...
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Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Experimental Tests for Outage Analysis in SISO Li-FiIndoor Communication Environment
Atchutananda Surampudi
The Li-Fi Research Centre,Indian Institute of Technology Madras.
(13:50 - 14:15)Room 7 - Session 3 - Networking
August 28, 2017
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 1 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Presenter
Atchutananda Surampudi,Networks and Stochastic Systems Laboratory,Indian Institute of Technology Madras.(C/O Prof. Radha Krishna Ganti)
Areas of Research
Visible Light Communications, Stochastic Geometry,Interference in Optical Wireless Networks.
ee16s003@ee.iitm.ac.in
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 2 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Li-Fi Project
ERNET - I.I.T. Madras Joint Project.
Team of Professors and Students fromIITM.
This work - One part of project.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 3 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Overview of Presentation
1 Motivation
2 Resources for Testing
3 Test 1 (LOS)
4 Test 2 (LOS)
5 Test 3 (NLOS)
6 Conclusion
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 4 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The IEEE 802.11a - Wi-Fi
The Wireless Internet Access [1].
The Wireless Fidelity (Wi-Fi) usingRadio waves since 1999.
[1] O’hara, Bob, and Al Petrick. IEEE 802.11 handbook: a designer’s companion. IEEEStandards Association, 2005.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 5 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Electromagnetic Spectrum
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 6 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Why not Visible Light ?
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 7 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
History - The Photophone
Sir Alexander Graham Bell (1880) atthe University Of Edinburgh, U.K [2]
[2] Bell, Alexander Graham. ”The photophone.” Journal of the Franklin Institute 110.4(1880): 237-248.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 8 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Light Fidelity (Li-Fi)
Prof Harald Hass (2011) at theUniversity Of Edinburgh, U.K [3].
[3] Haas, Harald. Harald Haas: Wireless data from every light bulb. TED, 2011.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 9 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Things to know about Li-Fi
Downlink − The Internet to user
Uplink − User to the Internet
LED - Transmitter andPhotodiode - Receiver(for both uplink anddownlink)
Energy efficientillumination
High speed data access
Secure Communications
Safe for Humans
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 10 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Optical Wireless Channel
Free space optics.
Static and time invariant channel [4].
Fading is absent. Only attenuation.
No Particular analytical theory for outage characterization.
Experimental tests are required
[4] Tsonev, Dobroslav, Stefan Videv, and Harald Haas. ”Light fidelity (Li-Fi): towardsall-optical networking.” Proc. SPIE. Vol. 9007. 2013.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 11 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Main Objectives of the work
Downlink performance in Single Input Single Output (SISO).
Tests to characterize outage in LOS and NLOS. Where the outageoccurs, for a given set of parameters ?
Does it work in Non Line of Sight communication ?
Outage
The situation when the Li-Fi Receiver Photodiode is not in theillumination region of the transmitter LED.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 12 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Li-Fi Research Laboratory @ERNET IITM R Park
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 13 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Testing Equipments
Component Product Name Quantity
Li-Fi downlink transmitter Luxspace DN561B 1Modem board Modem board 1Xitanium 20W LED power driver LBRD1514-1 1Uplink IR Receiver LBRD14016-3 1Li-Fi Dongel Li-Fi Dongel 1
Table: COMPONENTS : This table shows the Li-Fi communication componentsreceived from The Philips, Eindhoven
NOTE : Exact data sheet values not provided by the Philips.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 14 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The System Model (Schematic)
(0, 0)
Receiver Photodiode (PD)
Transmitter LED
(0, h)
h
z
l
θh
(HPSA)θ0,t
θ0,r
θf
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 15 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
The Tests for Outage Characterisation
Test I - Outage using Line Of Sight (LOS) received optical power(w.r.t the Photodiode).
Test II - LOS outage distance on ground (w.r.t the LED).
Test III - Outage in NLOS Communication
Tests are validated using [5].
[5] Lighting, Philips. Lighting manual. Phillips Lighting Company, 1981.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 16 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Test I (Line of Sight received optical power)
Fixed - LED at height h, HPSAof LED.
Variable - Position of thePhotodiode over R3, Colour ofthe LED - Red, Blue, Green(RGB).
To Measure - Received OpticalPower or Intensity.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 17 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
0 50 100 1500
1
2
3
4
5
6x 10
−4
Height in cm
Po
wer in
w
atts
Power received Vs height from source, 0 degree
y = red color
y = green color
y = blue color
y = white color
0 20 40 60 80 100 120 1400
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6x 10
−4
Height in cm
Po
wer in
w
atts
Power received Vs height from source, 30 degree
y = red color
y = green color
y = blue color
y = white color
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 18 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
0 20 40 60 80 100 1200
1
x 10−4
Height in cm
Po
wer in
w
atts
Power received Vs height from source, 40 degree
y = red color
y = green color
y = blue color
y = white color
5 10 15 20 25 30 350
0.5
1
1.5
2
2.5
3x 10
−5
Height in cm
Po
wer in
w
atts
Power received Vs distance from source, 50 degrees
y = red color
y = green color
y = blue color
y = white color
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 19 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Test II (Outage distance on Ground)
Fixed - HPSA of LED.
Variable - Height of the LED,Position of the Photodiode overthe ground R2, Colour of theLED - Red, Blue, Green (RGB).
To Measure - Received OpticalPower or Intensity at outage.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 20 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
40 60 80 100 120 140 160 180 20040
60
80
100
120
140
160
180
Height from ground in cm
Co
vera
ge d
ista
nce in
cm
Coverage distance Vs Source height from ground
y=red color
y=green color
y=blue color
y=white color
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 21 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
Test III (Non Line Of Sight Communication)
(0, 0)
Coloured Reflector
ds
dr
θsθr
LED transmitter
Receiver Photodiode
Fixed - θs = 0 ,θr = 0.
Variable - ds , drand colour ofreflector - Red,Green, Blue,White, Black.
To Measure -Outage distance(dr ,outage).
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 22 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
30 40 50 60 70 80 90 100 110 120 1300
50
100
150
200
250
300
350
400
Distance of source from reflector in cm
Ou
tag
e d
ista
nce in
cm
Outage distance Vs source distance from reflector
y=red reflector
y=green reflector
y=blue reflector
y=white reflector
y=black reflector
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 23 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
In a nut shell..
Advantages
Standard tests to characterisethe optical wireless channel.
Useful in multi LED - multipleuser interference scenario.
Useful for large scale deploymentconstraints and allocation.
Future Work
Improve the tests / standardiseover wider range of Li-Fiproducts.
Non Line of Sight (NLOS) TestIII for θs 6= 0, θr 6= 0.
Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 24 / 25
Motivation Resources for Testing Test 1 (LOS) Test 2 (LOS) Test 3 (NLOS) Conclusion
”Light can change the world.”, Prof. Harald Hass
;Atchutananda Surampudi (I.I.T. Madras) APAN 44, Dalian August 28, 2017 25 / 25
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