January 01, 2017

Location-based Information Transmission Systems using Visible Light Communications

  • Chen C.
  • Jialong Duan
  • Siu-Wai Ho

Lighting systems are undergoing a revolution from fluorescent lamps or tubes to light emitting diodes. Light emitting diodes have greater energy efficiency and longer lifetime. Built on this new lighting system, this paper considers further using the light sources to provide other benefits. The resulting system has low deployment cost and most importantly, it uses the unique characteristics of visible light to complement the existing wireless communication systems. Using visible light communications, this paper outlines a system design which has three different features. Firstly, it provides a provable secure wireless communication. In particular, a user is authenticated according to his/her location. Secondly, it includes indoor positioning systems with high precision. Lastly, it also supports information broadcast with a high frequency reuse factor. This paper provides both the experimental and theoretical results, presents techniques for using VLC under different channel characteristics and signal processing approaches, and reports their fundamental limits.

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Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...