Publications

Overview of Optical Wireless Communications Using the Visible Spectrum

  • N. Chi, H. Haas, M. Kavehrad, T.D.C. Little, X.L. Huang, “Visible Light Communications: Demand Factors, Benefits, and Opportunities,” Guest Editorial, IEEE Wireless Communications, IEEE 22 (2), pp. 5-7, 2015.

Beam Steering/Directional Communications

  • M.B. Rahaim and T.D.C. Little, “Ultra-Dense IoT Architecture using Hybrid CSMA with Sector Based Scheduling (CSMA/SS) via Visible Light Communications,” ACM MadCom, Proc. Intl. Conf. on Embedded Wireless Systems and Networks (EWSN), Uppsala, Sweden, Feb. 20-22, 2017.
  • J. Morrison, M.B. Rahaim, Y. Miao, M. Imboden, T.D.C. Little, V.J. Koomson, and D.J. Bishop, “Directional visible light communication signal enhancement using a varifocal micromirror with four degrees of freedom,” Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 99540C, September 7, 2016.
  • J. Morrison, M. Imboden, T.D.C. Little, and D.J. Bishop, “Electrothermally Actuated Tip-Tilt-Piston Micromirror with Integrated Varifocal Capability,” Optics Express, 2015.
  • M.B. Rahaim and T.D.C. Little, “SINR Analysis and Cell Zooming with Constant Illumination for Indoor VLC Networks,” Proc. 2nd Intl. Workshop on Wireless Optical Communications (IWOW) 2013, Northumbria University, Newcastle Upon Tyne, UK, October 21, 2013.
  • M.B. Rahaim, G.B. Prince, and T.D.C. Little, “State Estimation and Motion Tracking for Spatially Diverse VLC Networks,” Proc. 3rd IEEE Workshop on Optical Wireless Communications, Anaheim, CA, December 2012.

Modulation

  • A. Mirvakilli, H. Elgala, T.D.C. Little, V.J. Koomson, “Dimming and Modulation for VLC-Enabled Lighting,” in Optical Wireless Communications, M Uysal, C. Capsoni, Z. Ghassemlooy, A. Boucouvalas, E. Udvary (eds.), pp. 409-430, 2016.
  • H. Elgala and T.D.C. Little, “Polar-Based OFDM and SC-FDE Links towards Energy-Efficient Gbps Transmission under IM-DD Optical System Constraints [Invited],” to appear in J. Optical Communications and Networking,, Vol. 7, No. 2, January 2015.
  • H. Elgala, S.K. Wilson, and T.D.C. Little, “Optical Polar OFDM: on the Effect of Time-Domain Power Allocation Under Power and Dynamic Range Constraints,” to appear in Proc. IEE WCNC 2015, 2015 IEEE Wireless Communications and Networking Conference (WCNC) – Track 1: PHY and Fundamentals, 2015.
  • H. Elgala and T.D.C. Little, “SEE-OFDM: Spectral and Energy Efficient OFDM for Optical IM/DD Systems,” in Proc. IEEE Intl. Symp. on Personal, Indoor and Mobile Radio Communications (PIMRC 2014),Sept. 2-5, 2014, Washington DC.
  • M. Biagi, A.M. Vegni, S. Pergoloni, P. Butala, and T.D.C. Little, “Trace-Orthogonal PPM-Space Time Block Coding Under Rate Contstraints for Visible Light Communication,” J. of Lightwave Technology, January 2015.
  • H. Elgala, and T.D.C. Little, “P-OFDM: Spectrally Efficient Unipolar OFDM,” Proc. Optical Fiber Communication Conference and Exposition (OFC), March 13, 2014, San Francisco, CA, 2014.
  • T.D.C. Little and H. Elgala, “Adaptation of OFDM under Visible Light Communications and Illumination Constraints,” to appear in Proc. Asilomar Conference on Signals, Systems, and Computers, November 2-5, 2014, CA.
  • M. Biagi, T. Borogovac, and T.D.C. Little, “Adaptive Receiver for Indoor Visible Light Communications,” IEEE/OSA J. of Lightwave Technology, 2014.
  • T.D.C. Little and Hany Elgala, “SEE-OFDM: Spectral and Energy Efficient OFDM for Optical IM/DD Systems”, submitted.
  • J. Gancarz, H. Elgala, and T.D.C. Little, “Impact of Lighting Requirements on VLC Systems,” IEEE Communications Magazine, Special Issue on Visible Light Communications December 2013.
  • H. Elgala and T.D.C. Little, “Reverse Polarity Optical-OFDM (RPO-OFDM): Dimming Compatible OFDM for Gigabit VLC Links,” Optics Express, Vol. 21, Issue 20, pp. 24288-24299 (2013).
  • H. Elgala, and T.D.C. Little, “P-OFDM: Spectrally Efficient Unipolar OFDM,” Optical Fiber Communication Conference and Exposition (OFC), March 13, 2014, San Francisco, CA, 2014.
  • T.D.C. Little, H. Elgala, Provisional patent application: Optical Orthogonal Frequency Division Multiplexing (O-OFDM) Combined with Pulse-Width Modulation (PWM) Dimming.

OW MIMO

  • J.C. Chau, C. Morales, and T.D.C. Little, “Using Spatial Light Modulators within MIMO Visible Light Receivers to Dynamically Control the Optical Channel,” Proc. MadCOM 2016, Graz Austria, April 2016.
  • Chau and T.D.C. Little, “Analysis of CMOS Active Pixel Sensors as Linear Shift-Invariant Receivers,” Proc. IEEE ICC 2015 — 1st Workshop on Visible Light Communications and Networking (VLCN), June 2015.
  • P.M. Butala, H. Elgala, T.D.C. Little, and P. Zharkesh-Ha, “Multiwavelength Visible Light Communications System Design,” in Proc. IEEE Globecom Workshop on Optical Wireless Communications, December 2014.
  • J.C. Chau and T.D.C. Little, “Scalable Imaging VLC Receivers with Token-Based Pizel Selection for Spatial Multiplexing,” Proc. 1st ACM Mobicom Workshop on Visible Light Communication Systems, Maui, HI, September 2014.
  • P. Butala, H. Elgala, T.D.C. Little, “Sample Indexed Spatial Orthogonal Frequency Division Multiplexing,” Chinese Optics Letters, Volume 12 Issue 9, 2014.
  • P. Butala, H. Elgala, and T.D.C. Little, “Performance of Optical Spatial Modulation and Spatial Multiplexing with Imaging Receiver,” Proc. IEEE Wireless Communications and Networking Conference (WCNC) 2014, Istanbul, Turkey, April 6, 2014.
  • P. Butala, H. Elgala, T.D.C. Little, “Sample Indexed Spatial Orthogonal Frequency Division Multiplexing,” Chinese Optics Letters, Volume 12 Issue 9, 2014 (to appear)
  • P. Butala, H. Elgala, and T.D.C. Little, “Performance of Optical Spatial Modulation and Spatial Multiplexing with Imaging Receiver,’’ Proc. IEEE Wireless Communications and Networking Conference (WCNC) 2014, Istanbul, Turkey, April 6, 2014.
  • P. Butala, H. Elgala, and T.D.C. Little, “SVD-VLC: A Novel Capacity Maximizing VLC MIMO System Architecture Under Illumination Constraints,” in Proc. IEEE Globecom Workshop on Optical Wireless Communications, December 2013.

Small Cells/Mobility

  • M.B. Rahaim and T.D.C. Little, “Optical Small Cells, RF/VLC HetNets, and Software Defined VLC,” Visible Light Communications: Theory and Applications, 1st Edition, June 2017.
  • M.B. Rahaim and T.D.C. Little, “Reconciling Approaches to SNR Analysis in Optical Wireless Communications,” Proc. IEEE WCNC 2017.
  • M.B. Rahaim and T.D.C. Little, “Ultra-Dense IoT Architecture using Hybrid CSMA with Sector Based Scheduling (CSMA/SS) via Visible Light Communications,” ACM MadCom, Proc. Intl. Conf. on Embedded Wireless Systems and Networks (EWSN), Uppsala, Sweden, Feb. 20-22, 2017.
  • M.B. Rahaim and T.D.C. Little, “Bounding SINR with the constraints of an optical wireless channel,” Proc. 2016 IEEE International Conference on Communications Workshops (ICC), Kuala Lumpur, 2016, pp. 417-422.
  • M. Ayyash, H. Elgala, A. Khreishah, V. Jungnickel, T.D.C. Little, S. Shao, M. Rahaim, D. Schulz, R. Freund, “Coexistence of WiFi and LiFi Towards 5G: Concepts, Opportunities, and Challenges,” IEEE Communications Magazine, 54(2), January 2016.
  • M.B. Rahaim and T.D.C. Little, “Integration of RF and VLC Systems,” R. Karlicek et al. (eds.) Handbook of Advanced Lighting Technology, Springer, 2016.
  • A. Aldalbahi, M.B. Rahaim, A. Khreishah, M. Ayyash, R. Ackerman, J. Basuino, W. Berreta, and T.D.C. Little,” Extending ns3 to simulate visible light communication at network-level,” 2016 23rd Intl. Conf. on Telecommunications (ICT), Thessaloniki, 2016, pp. 1-6.
  • S. Shao, A. Khreishah, M. Ayyash, M.B. Rahaim, H. Elgala, V. Jungnickel, D. Schulz, T.D.C. Little, J. Hilt, and R. Freund, “Design and Analysis of a Visible-Light-Communication Enhanced WiFi System,” Journal of Optical Communications and Networking, Vol. 7, No. 10, pp. 960-973, 2015.
  • S. Shao, A. Khreishah, M. Rahaim, H. Elgala, T.D.C. Little, and M. Ayyash, “An Indoor Hybrid WiFi-VLC Internet Access System,” in Proc. Workshop of CellulAR Traffic Offloading to Opportunistic Networks (CARTOON) Philadelphia, PA, October 2014.
  • M.B. Rahaim, T.D.C. Little, “Evaluation of Signal to Noise Ratio in Heterogeneous RF/OW Networks,” submitted to IEEE JSAC- 2014 Special Issue on Optical Wireless Communication, 2014.
  • M.B. Rahaim and T.D.C. Little, “SINR Analysis and Cell Zooming with Constant Illumination for Indoor VLC Networks,” Proc. 2nd Intl. Workshop on Wireless Optical Communications (IWOW) 2013, Northumbria University, Newcastle Upon Tyne, UK, October 21, 2013.
  • M.B. Rahaim, G.B. Prince, and T.D.C. Little, “State Estimation and Motion Tracking for Spatially Diverse VLC Networks,” Proc. 3rd IEEE Workshop on Optical Wireless Communications, Anaheim, CA, December 2012
  • M.B. Rahaim, A.M. Vegni, and T.D.C. Little, “A Hybrid Radio Frequency and Broadcast Visible Light Communication System,” Proc. IEEE Globecom 2011 2nd Workshop on Optical Wireless Communications (OWC 2011), pp. 818-822, Dec. 5-9, 2011, Houston TX, USA.

Testbed

  • H. Elgala, M.B. Rahaim, T.D.C. Little, A. Mirvakili, and V. Koomson, “Wireless Access Testbed through Visible Light and Dimming Control,” to appear in Proc. IEE WCNC 2015, 2015 IEEE Wireless Communications and Networking Conference (WCNC) – Track 4: Services, Applications, and Business, 2015.
  • S. Shao, A. Khreishah, M.B. Rahaim, H. Elgala, T.D.C. Little, and M. Ayyash, “An Indoor Hubrid WiFi-VLC Internet Access System,” in Proc. Workshop of CellulAR Traffic Offloading to Opportunistic Networks (CARTOON) Philadelphia, PA, October 2014.
  • M.B. Rahaim, M. Hella, A. Mirvakilli, S. Ray, V.J. Koomson, and T.D.C. Little, “Software Defined Visible Light Communication,” Proc. Wireless Innovation Forum Conference on Communications Technologies and Software Defined Radio (SDR-WinnComm 2014), April 2014.
  • T.D.C. Little and H. Elgala, “Adaptation of OFDM under Visible Light Communications and Illumination Constraints”, the Asilomar Conference on Signals, Systems, and Computers, November 2-5, 2014, CA.
  • H. Elgala and T.D.C. Little, “Reverse Polarity Optical-OFDM (RPO-OFDM): Dimming Compatible OFDM for Gigabit VLC Links,” Optics Express, Vol. 21, Issue 20, pp. 24288-24299 (2013).
  • M. Rahaim, M. Hella, A. Mirvakilli, S. Ray, V.J. Koomson,  and T.D.C. Little, “Software Defined Visible Light Communication,” Proc. Wireless Innovation Forum Conference on Communications Technologies and Software Defined Radio (SDR-WinnComm 2014), April 2014.
  • M.B. Rahaim, J. Carruthers, and T.D.C. Little, “Accelerated Impulse Response Calculation for Indoor Optical Communication Channels,” Proc. IEEE International Conference on Wireless Information Technology and Systems (ICWITS 2012), Maui, HI November 2012.

2011 and Previous

  • T. Borogovac, M. Rahaim, M. Tuganbayeva, and T.D.C. Little, “Lights-off’ Visible Light Communications,” Proc. IEEE Globecom 2011 2nd Workshop on Optical Wireless Communications (OWC 2011), pp. 823-827, Dec. 5-9, 2011, Houston TX, USA.
  • M. Rahaim, A. Mirvakili, T. Borogovac, T.D.C. Little, and V. Joyner, “Demonstration of a Software Defined Visible Light Communication System,” Mobicom 2011, Poster and Demonstration Competition, September 2011.
  • A. Mostafa, A.M. Vegni, R. Singoria, T. Oliveira, T.D.C. Little, and D.P. Agrawal, “A V2X-based approach for reduction of delay propagation in Vehicular Ad-Hoc Networks,” Proc. Intl. Workshop on Seamless Connectivity in Vehicular Networks (SCVN 2011), part of the 11th IEEE International Conference on ITS Telecommunications (ITST 2011), Saint-Petersburg, Russia, August 23-25, 2011.
  • T.D.C. Little, A. Agarwal, J. Chau, M. Figueroa, A. Ganick, J. Lobo, T. Rich, P. Schimitsch, “Directional Communication System for Short-Range Vehicular Communications,” Proc. 2nd IEEE Vehicular Networking Conf. (VNC 2010), Jersey City, December 15, 2010.
  • A. Agarwal and T.D.C. Little, “Role of Directional Wireless Communication in Vehicular Networks,” in Proc. Intelligent Vehicles Symposium (IV’10), San Diego, CA, June 2010.
  • A.M. Vegni, C. Vegni, and T.D.C. Little, “Opportunistic Vehicular Networks by Satellite Links for Safety Applications,” in Proc. of the Fully Networked Car Workshop, Geneva International Motor Show, Geneva, Switzerland, March 3-4, 2010.
  • A.M. Vegni and T.D.C. Little, “A Message Propagation Model for Hybrid Vehicular Communication Protocols,” in Proc. 2nd Intl. Workshop on Communication Technologies for Vehicles (Nets4Cars), in the 7th IEEE Int. Symp. on Communication Systems, Networks and DSP, (CSNDSP 2010), Newcastle, UK, July 2010.
  • Z. Wu and T.D.C. Little, “Network Solutions for the LOS Problem of New Indoor Free Space Optical System,” in Proc. IEEE, IEE Intl. Symp. on Communciations Systems, Networks, and Digital Signal Processing 2010, Newcastle, UK, July 2010.
  • M. Rahaim, T. Borogovac and J. B. Carruthers,”CandLES: Communications and Lighting Emulation Software” WiNTECH 10: Proc. 5th ACM International Workshop on Wireless Network Testbeds, Experimental Evaluation and Characterization. ACM, 2010.
  • T. Borogovac, M. Rahaim and J. B. Carruthers,”Spotlighting for Visible Light Communications and Illumination”, Proc. 1st IEEE Workshop on Optical Wireless Communications. GLOBECOM, 2010.
  • A. Ganick, M. Figueroa, J. Lobo, P. Schimitsch, T. Rich, and T.D.C. Little, “Vehicular Networking Using Optical Transceivers,” Poster and Demonstration Program, MobiSys 2010, San Francisco, CA, June 15, 2010.
  • J. Chau, K. Matarese, and T.D.C. Little, “IP-Enabled LED Lighting Supporting Indoor Mobile and Wireless Communications,” Poster and Demonstration Program, MobiSys 2010, San Francisco, CA, June 15, 2010.
  • Michael Rahaim, Tarik Borogovac and Jeff Carruthers, “CandLES – Communication and Lighting Emulation Software,” CISE Technical Report # 2010-IR-0006, 9 June 2010.
  • A. Agarwal and T.D.C. Little, “Role of Directional Wireless Communication in Vehicular Networks,” in Proc. Intelligent Vehicles Symposium (IV’10), San Diego, CA, June 2010.
  • A.M. Vegni, C. Vegni, and T.D.C. Little, “Opportunistic Vehicular Networks by Satellite Links for Safety Applications,” in Proc. of the Fully Networked Car Workshop, Geneva International Motor Show, Geneva, Switzerland, March 3-4, 2010.
  • T.D.C. Little, P. Dib, K. Shah, N. Barraford, and B. Gallagher, “Using LED Lighting for Ubiquitous Indoor Wireless Networking,” Proc. 4th IEEE Intl. Conf. on Wireless and Mobile Computing, Networking and Communications (WiMob 2008) October, 2008, Avignon, France.
  • T.D.C. Little and A. Agarwal “Connecting Vehicles to ‘The Grid,'” Proc. NITRD National Workshop on High-Confidence Automotive Cyber-Physical Systems, April 3-4, 2008, Troy, MI.
  • A. Agarwal, D Starobinski, and T.D.C. Little, “Exploiting Downstream Mobility to Achieve Fast Upstream Message Propagation in Vehicular Ad Hoc Networks,” Proc. Mobile Networking for Vehicular Environments 2007, Infocom 2007, Anchorage, AK, May 2007.
  • T.D.C. Little and A. Agarwal, “Prospects for Networked Vehicles of the Future,” Proc. Workshop on Smart Transportation, 13th IEEE Real-Time and Embedded Technology and Applications Symposium, Bellevue, WA, April 2007.

Other topics/vintage papers found here