Emily Lam

About           Research           Projects           Other  

I work under Prof. Thomas D.C. Little in the Multimedia Communications Lab (MCL) and the Center for Lighting Enabled Systems & Applications (LESA), formerly known as the NSF Smart Lighting Engineering Research Center. My overarching themes are in Visible Light Communication (VLC) and networked smart spaces and technology. I tend toward projects with application with societal benefits. My most recent efforts have focused on spectral and energy efficient VLC modulation techniques as well as visible light positioning. Collaborators include Prof. Hany Elgala and Prof. Sarah Kate Wilson.


Dimmable VLC

This video demostrates data transmission and dimability using the Reverse Polarity Optical Orthogonal Frequnecy Division Multiplexing (RPO-OFDM) modulation scheme. The demo cycles through 8 discrete intensity values. The first figure shows the RPO-OFDM signal, the second figure shows the symbols being sent, the third figure shows the received signal, the fourth figure shows the time-domain OFDM signal, the fifth figure shows the received symbols, and the sixth figure shows the bit-error-rate (BER). The change in intensity isn't distinctly noticable to the human eye until the changes in the low intensity region. This is due to the fact that the human eye does not detect brightness linearly.

RPO-OFDM paper by Hany Elgala and Thomas D.C. Little

Tracking using IR Cameras

This video networks Optitrack, a retroreflective-based IR camera system, and a DMX controlled steerable beam to track users in the room. The system server is multithreaded and uses TCP client/server networking interface as well as the NatNet api and a DMX library provided by TinkerKit. This is preliminary work geared toward exploring applications for future positioning systems based on Visible Light Positioning (VLP).

Code for the system server and beam client can found on my GitHub.

FYI, you're on the mobile version.