Post on 21-Mar-2020
transcript
LiFi: Making Fibre Wireless
Mohamed Sufyan Islim and Harald Haas
http://www.lifi.eng.ed.ac.uk/
@dlarah15
© 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.
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
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.
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