LiFi: Novel Digital Modulation Techniques for Li-Fi

Li-Fi (Light-Fidelity) is high speed wireless communications through light emitting diodes (LEDs). Li-Fi has first been coined by Prof. Haas in his TED talk:

We investigate Li-Fi in the context of novel 5G technologies to solve the looming spectrum crisis in wireless communications. Transmission speeds of up to 10 Gbps have been demonstrated in our lab and it has also been shown that Li-Fi does not required line-of-sight. Therefore, we are now studying wireless system concepts based on Li-Fi technology. We refer to a cellular Li-Fi network as an attocell network as the cell sizes are smaller than in a typical radio frequency (RF) femtocell network potentially unlocking very high area spectral efficiencies.

Novel Digital Modulation Techniques for Li-Fi

Li-Fi uses intensity modulation and direct detection. Therefore, the signals must be strictly real valued and positive. These constraints pose limitation on digital modulation techniques. These limitations result in spectrum-efficiency or power-efficiency losses. This project investigates novel digital modulation techniques for Li-Fi that help overcome these limitations. The project will initially compare state-of-the-art techniques such as multicarrier transmission techniques such as orthogonal frequency division multiplexing (OFDM), pulse-amplitude modulation (PAM) and carrier-less amplitude modulation (CAP).

Further Information: 

Alexander Graham Bell building, King's Buildings Campus, University of Edinburgh
The Li-Fi R&D Centre is located within the Alexander Graham Bell building, University of Edinburgh

Principal Supervisor: 


Minimum entry qualification - an Honours degree at 2:1 or above (or International equivalent) in a relevant science or engineering discipline, possibly supported by an MSc Degree. Further information on English language requirements for EU/Overseas applicants.


Strong candidates may be considered for full EPSRC funding - open to UK/EU candidates only.

Further information and other funding options.

Closing Date: 

Monday, June 1, 2015