What is LiFi? Harald Haas, and Cheng Chen.

Transcription

1 What is LiFi? Harald Haas, and Cheng Chen

2 What LiFi is NOT 2

3 LiFi attocells: A new layer in HetNets Tsonev, D.; Videv, S.; and Haas, H.; Light fidelity (Li-Fi): towards all-optical networking, Proc. SPIE 9007, Broadband Access Communication Technologies VIII, , 10 pages, 1 February 2014 Rahaim, M.B.; Little, T.D.C., "Toward practical integration of dual-use VLC within 5G networks," in IEEE Wireless Communications, vol.22, no.4, August

4 A real world optical attocell network Mobile World Congress,

5 The LiFi technology eco system Example: TOUCAN VLC 5

6 The LiFi technology eco system Example: TOUCAN LiFi VLC 6

7 LiFi competitive advantages Data density Security Energy efficiency *Li-1 st Safety Use of existing infrastructure *Li-Flame 7

8 Data density 8

9 Modelling optical attocellular networks 9

10 Data rates and area spectral efficiency 100 Mbps using off-the-shelf LEDs 10 Gbps using multicolour micro LEDs mixed into white light 100 Gbps using multi colour incoherent laser LEDs with diffuser to produce safe white light and desired coverage (e.g., head light in BMW i8) improved area data rate compared to radio frequency femtocellular networks LiFi LiFi LiFi LiFi hex 10

11 Security 11

12 Security WiFi LiFi WiFi WiFi LiFi LiFi WiFi LiFi Li-Fi Li-Fi Networks 12

13 Energy Efficiency 13

14 Energy Efficiency WiFi AP. Light / LiFi AP Scenario Parameter Value Total Area (m 2 ) 5000 Room Size (m 2 ) 100 Num. Rooms 50 Num. Users variable Light Coverage Area (m 2 ) 10 Light Power (W) 15 WiFi AP Parameter Data Rate (Mbps) 1000 Coverage Area (m 2 ) 200 Power (W) 12 LiFi AP Parameter Data Rate (Mbps) 50 Coverage Area (m 2 ) 10 Power (W) 5 14

15 Energy Efficiency Number of Users WiFi Rate per user (Mbps) WiFi capacity (Mbps) LiFi Rate per user (Mbps) LiFi capacity (Mbps) ASE EE (bits/m 2 /W) (bits/user/w) Ratio Ratio

16 Common misconceptions... Lights cannot be dimmed. The lights flicker. This is for downlink only. There will be interference from sunlight. Lights need to be on so this is inefficient. This is a line-of-sight technology. 16

17 Misconception number one: LoS 17

18 Delivering the LiFi Vision: LiFi R&D Centre Internet -of- Things Security Defence Transport Lighting Big data Health 5G Smart Environments 18

19 Research highlights 19

20 3 Gbps from single 5 mw micro LED Tsonev, et al., PTL,

21 m 10 m 1.1 Gbps 21

22 Data Rate [Gb/s] Average BER Required Devices per Ilumination [lx] Towards 100 Gbps 1 m 2 1 m 2 Coverage 3 m Tsonev, et al, Optics Express, E E E-3 89 x x

23 LiFi Tx chip Parameter Specification Type Current Steering Segmented # DACs per Chip 4 Resolution 8 bits Current Drive Adjustable, 30mA 255mA Sampling rate Up to 500 MS/s Nyquist rate Up to 250MHz Advantages Current to Light Multi channel No amplifier circuitry V-I can be avoided Clock+ Data I/F Configuration I/F 500MHz LVDS 1MHz serial interface Chip Area ~ 30 Sq. mm Additional Features GANG/MIMO operation Adjustable offset current (0 120mA) 23

24 Efficiency (%) Performance comparison Power Efficiency vs Data Rate [2] [1] [3] [4] Data Rate (Mbps) This Work [1] - Dual Purpose Off-line LED Driver Kumar et.al, IEEE Transactions on Industry Applications [2] - A Dimmable LED Driver Zhao et.al, Applied Power Electronics Conference anexposition (APEC), 2013 Twenty-Eighth Annual [3] - High Efficiency LED Driver Design Mirvakili et.al, Photonics Society Summer Topical Meeting Series, 2012 [4] - A 237mW adsl2+ CO Line Driver Serneels et.al, Solid-State Circuits Conference, IEEE International 24

25 LiFi Rx chip 25

26 1 2 m 26

27 Fully integrated transmitter chip 27

28 Single photon avalanche detector (SPAD) Li, et al, PTL,

29 Turning off-the-shelf solar cell into LiFi receivers Lighting + data LEDs Energy harvesting + data solar cells 29

30 Solar cells receive up to 50 Mbps Wang, Tsonev, Haas, et al. On the Design of a Solarpanel Receiver for Optical Wireless Communications with Simultaneous Energy Harvesting, JSAC, 2015 Zhang, Tsonev, Haas, et al. Organic solar cells as high-speed data detectors for visible light communication, Optica,

31 Solar cells receive up to 50 Mbps Wang, Tsonev, Haas, et al. On the Design of a Solarpanel Receiver for Optical Wireless Communications with Simultaneous Energy Harvesting, JSAC, 2015 Zhang, Tsonev, Haas, et al. Organic solar cells as high-speed data detectors for visible light communication, Optica, TEDGlobal, 29 Sep. 2015, London

32 Hybrid Li-Fi / Wi-Fi Networks 32

33 Hybrid Li-Fi / Wi-Fi Networks - results Wang, et al. Dynamic Load Balancing with Handover in Hybrid Li-Fi 33and Wi-Fi Networks, JLT (to appear)

34 Summary LiFi is complete wireless network using light instead of radio LiFi attocell network achieves: times improved area data rates, 50 times improved energy efficiency First LiFi MIMO capable transmitter and receiver IC developed in UP-VLC project Micro LEDs integrated on CMOS Tx chip for IoT Programmable optical attocell layer enabled by SDN (TOUCAN project) 34