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School of Electrical and Computer Engineering

SARL's mission: Application of MIMO and adaptive arrays to enhance wireless networks

Research & Projects

Channel Sounding

For performance analysis of links with multiple-antenna (e.g. MIMO or adaptive array) or directional antenna terminals, the channel description should include spatial information. Wideband or frequency selective channels, for OFDM for example, must include delay (time) information. We have measured the space-time channel for a variety of indoor and outdoor-to-indoor scenarios. Our virtual array measurement system enables study of the effects of array geometry at both terminals of the indoor channel. Fast or time-selective channels must have Doppler information. The new 802.11p (WAVE/DSRC) standard applies to channels with double selectivity (time and frequency). We have also measured the Doppler-delay (scattering function) for the vehicle-to-vehicle channel.

Channel Modeling

Our physical layer models are primarily geometric stochastic models, which enable convenient evaluation of links that have directional antennas, MIMO or adaptive arrays. For MAC protocol analysis, we have developed realistic ns2 models for the MIMO physical layer.

Performance Analysis and Algorithm Development

We analyze links in terms of bit error rate (BER), packet error rate (BER), and ergodic capacity. We consider imperfect synchronization. We also perform MAC layer analysis using ns2, with metrics including throughput and delay. Examples of algorithm development include novel antenna selection schemes for MIMO and new MAC protocols that exploit the interference cancellation and nulling capability of MIMO receivers.

Prototyping

We welcome opportunities to test designs and algorithms with prototypes. Prototyping gives us insight into the cost drivers and performance bottlenecks in real systems. Recent examples include a high-speed indoor MIMO-OFDM link and an adaptive array LEO ground station.

Current Projects

  • National Science Foundation, "NETS-NOSS: Cooperative Communication for Wireless Sensor Networks," with Ragupathy Sivakumar, August 2007-July 2010
  • National Science Foundation, "NETS-NOSS: Cross Layered Solutions for Correlated Data Gathering in Wireless Networks," with Ragupathy Sivakumar, Faramarz Fekri, Ian Akyildiz, August 2005-July 2009

Past Projects

  • ARINC, "Certification Test Development for DSRC," July 2005-December 2007, Measurements and modeling for the vehicle-to-vehicle channel, including the definition and demonstration of the motion-related certification test for IEEE 802.11p WAVE/DSRC equipment.
  • National Science Foundation, "ITR: A Cross-layer PHY/MAC Solution for Ad-Hoc Networks with Multiple-Element Arrays," with Ragupathy Sivakumar, July 2003-June 2007.
  • NASA Goddard Space Flight Center, "Exploring Array Reception of the EO-1 Downlink,"  with Thomas Pratt, Paul Steffes, and John Langley, April 2003-March 2006.
  • Georgia Tech Broadband Institute (GTBI), "Quality-of-Service and Security of Voice-over IP (VoIP): An End-to-End Approach for Multi-Network Environments," with Mustaque Ahamad, Yucel Altunbasak, Douglas M. Blough, Chuanyi Ji, Wenke Lee, and Henry Owen, and Ragupathy Sivakumar, Jan 2006-Dec 2006.
  • Georgia Tech Broadband Institute (GTBI), "Cooperative Transmission Analysis," July 2007-December 2007. Seed funding to begin exploring cooperative transmission for ad hoc networks.

 

Last revised on April 21, 2006.