LiFi: Making Fibre Wireless - PhoxTroT · LiFi: Making Fibre Wireless Mohamed Sufyan Islim and...
Transcript of LiFi: Making Fibre Wireless - PhoxTroT · LiFi: Making Fibre Wireless Mohamed Sufyan Islim and...
LiFi: Making Fibre Wireless
Mohamed Sufyan Islim and Harald Haas
http://www.lifi.eng.ed.ac.uk/
@dlarah15
Wireless data demandGlobal Mobile Data Traffic
© 2010 mylerdude – Flickr. This work is licensed under Creative Commons Attribution 2.0 Generic.
© 2010 mylerdude – Flickr. This work is licensed under Creative Commons Attribution 2.0 Generic.
Path loss
𝐿 ∝ 𝑓2Friis equation:
Additional path loss
3 GHz 60 GHz: 26 dB !
The electromagnetic spectrum
What LiFi is NOT only
Why not use existing infrastructure?
LiFi for 5G and beyond
[1] Haas, H., “High-speed wireless networking using visible light, SPIE Newsroom, Online: http://spie.org/x93593.xml (invited)
[2] Haas, H., and Cheng Chen, “What is LiFi?”, ECOC 2015, 27 Sep. – 1 Oct. 2015 (invited)
[3] Haas, H., Wang, Y., Cheng Chen, and Yin, L., “What is LiFi?”, Journal of Lightwave Technology, vol. 3, iss. 8, April 2016 (invited)
[4] Tsonev, D.; Videv, S.; and Haas, H.; “Light fidelity (Li-Fi): towards all-optical networking,” Proc. SPIE 9007, Broadband Access Communication
Technologies VIII, 900702, 1 Feb. 2014
5
• Security
• Energy Efficiency
• Localization
• Data density
• Safety
LiFi: Competitive Advantages
Common Misconceptions
Is this a line-of-sight technology? What about flickering?
A: Let’s do an experiment.Will there be interference from sunlight?
Performance comparison Dark Room
Sunlight Irradiance
Sunlight + Blue Filter
S86
64
-50
K[1
9.6
mm
2]
Average SNR [dB] 17.57 12.42 16.64
SNR degradation compared to Dark Room 0% 29.33% 5.32%
Data rate @ BER< 3.8e-3 [Mbps] 416.44 313.35 396.71
Degradation of data rates compared to Dark Room.
0% 24.8% 4.7%
S86
64
-05
K[0
.19
mm
2]
Average SNR [dB] 18.58 16.42 17.36
SNR degradation compared to Dark Room 0% 11.6% 1.7%
Data rate @ BER< 3.8e-3 [Mbps] 1139.26 1015 1122.34
Degradation of data rates compared to Dark Room.
0% 10.9% 1.5%
Misconception: Interference from sunlightLa
rge
AP
DSm
all
AP
D
Misconception: There are no components
LED technology
Data rate / Gbps
RGB LEDPhosphor coated blue LED
GaN micro LED
0.1
1
10
100
RGB laser LEDs
Other common misconceptions...• Lights cannot be dimmed.
• This is for downlink only.
• Lights need to be on so this is inefficient.
Is it only for short distance?
1.1 Gbps @ 10 m
10 m1.1 Gbps
19
Towards 100 Gbps
1 m2
3 m
Data
Rate
[G
b/
s]
Averag
eB
ER
Req
uir
ed
D
evic
es
per 1
m2
Co
verag
e
Ilu
min
ati
on
[lx
]
14 6.07E-4 89 x 3 844
100 2.04E-3 9 x 36 971
3.5 2.33E-3 3 21
http://spectrum.ieee.org/tech-talk/semiconductors/optoelectronics/laser-
lifi-could-blast-100-gigabits-per-second
Tsonev, et al, Optics Express, 2015
Transmitter and receiver ASICsTransmitter LiFi MIMO ASICReceiver LiFi MIMO ASIC
Jalajakumari, A.V.N.; Tsonev, D.; Cameron, K.; Haas, H.; Henderson, R., "An energy efficient high-speed digital LED driver for visible light communications," ICC 2015, doi: 10.1109/ICC.2015.7249125
16 Channel integrated transmitter ASIC
Light as a Service
Conclusion
Generations ParadigmShifts
Service pull Impact
1G 2G Analogue to digital
Mobile telephony Revolution
2G 3GSmall cell concept
Mobile Internet Evolution3G 4G
4G 5G RF to Light? LaaS and Internet of Things?
Revolution?