Princeton-Rutgers Seminar Series in Information Sciences & Systems

Title: On the Optimality of LAttice Space-Time (LAST) Coding

Speaker: Hesham El Gamal, Ohio State University

Date: March 15, 2004, 4:00 - 5:00pm

Location: DIMACS Center, CoRE Bldg, Room 431, Rutgers University, Busch Campus, Piscataway, NJ


In this talk, we will introduce the class of LAttice Space-Time (LAST) codes and show that this class achieves the optimal diversity-vs-multiplexing tradeoff under lattice decoding and minimum delay. This result settles the open problem posed by Zheng and Tse and sheds more light on the structure of optimal coding/decoding techniques in delay limited MIMO channels. In particular; 1) we show that MMSE-GDFE plays a fundamental role in approaching the limits of delay limited MIMO channels in the high SNR regime, unlike the AWGN channel case and 2) our random coding arguments represent a major departure from traditional space-time code designs based on the rank and/or mutual information design criteria. Finally, we will discuss the potential impact that our results may have on the design of future MIMO systems.

This is a joint work with Giuseppe Caire and Oussama Damen.


Hesham El Gamal received the B.S. and M.S. degrees in Electrical Engineering from Cairo University, Cairo, Egypt, in 1993 and 1996, respectively, and the Ph.D. degree in Electrical and Computer Engineering from the University of Maryland at College Park, MD, in 1999. From 1993 to 1996, he served as a Project Manager in the Middle East Regional Office of Alcatel Telecom. From 1996 to 1999, he was a Research Assistant in the Department of Electrical and Computer Engineering, the University of Maryland at College Park, MD. From February 1999 to December 2000, he was with the Advanced Development Group, Hughes Network Systems (HNS), Germantown, MD, as a Senior Member of the Technical Staff. In the Fall of 1999, he served as a lecturer at the University of Maryland at College Park. Since January 2001 he has been an Assistant Professor in the Electrical Engineering Department at the Ohio State University in Columbus, Ohio. He held visiting appointments at UCLA (Fall 2002, Winter 2003) and Eurecome Institute (Summer 2003)

He is a recipient of the HNS Annual Achievement Award (2000), the OSU College of Engineering Lumley Research Award (2003), the OSU Electrical Engineering Department FARMER Young Faculty Development Fund (2003-2008), and the National Science Foundation CAREER Award (2004). He holds 5 patents and has 8 more applications pending. He is a Senior Member of the IEEE, currently serves as an Associate Editor for ``Space-Time Coding and Spread Spectrum'' for the IEEE Transactions on Communications, and is a member of the SP4COM technical committee.