Seminar: What have we learned so far about MIMO in mobile systems?

Monday, February 8, 2010 - 11:00am - 12:00pm EST

  • Location:Dibner Building, LC 400
    Five MetroTech Center

    Brooklyn, New York
  • Price:

Speaker: Dr. Bertrand M. Hochwald

Faculty Host: Professor Elza Erkip


Fourth-generation mobile wireless multiuser systems such as WiMax are now being deployed with multiple-antennas at both the transmitter and receiver. These multiple-input-multiple-output (MIMO) deployments are modest in the number of antennas, typically two at the basestation and two at the mobile. We have had some time now to evaluate the effectiveness of MIMO in live mobile networks, and what have we learned?

Once MIMO is enabled it is rarely turned off again.  It "sells well" and performs even better.  The promise of high spectral efficiencies often dominates MIMO discussions, but there are other perhaps less-obvious reasons why MIMO is is being welcomed.  I will discuss what we have learned so far using field data from our deployments, and speculate on the role of MIMO in systems to come.


Bertrand M. Hochwald was born in New York, NY. He received his undergraduate education from Swarthmore College, Swarthmore, PA. He received a M.S. degree in electrical engineering from Duke University, Durham, NC, and a M.A. degree in statistics and the Ph.D. degree in electrical engineering from Yale University, New Haven, CT.

From 1986 to 1989, he worked for the Department of Defense, Fort Meade, MD. After completing graduate school he was a Research Associate and Visiting Assistant Professor at the Coordinated Science Laboratory, University of Illinois, Urbana-Champaign.  In September 1996, he joined the Mathematics of Communications Research Department at Bell Laboratories, Lucent Technologies, Murray Hill, NJ where he was a Distinguished Member of the Technical Staff.

In 2005 he joined Beceem Communications, Santa Clara, CA, as their Chief Scientist, and in 2009 as Vice-President of Systems Engineering.  He is also currently a Consulting Professor in Electrical Engineering at Stanford University, Palo Alto, CA.

He has several patents in the field of wireless communication and is the recipient of several achievement awards while employed at the Department of Defense and the Prize Teaching Fellowship at Yale University.  He has taught at the University of Illinois and Columbia University.  He has served as an Editor for several IEEE journals and given plenary and invited talks on various aspects of signal processing and communications.  He has co-invented several well-known multiple-antenna techniques, including a differential method, linear dispersion codes, and multi-user methods.  His papers have been listed by Thomson ISI as most-cited in multiple years.

In 2006, he received the Stephen O. Rice Prize for the best paper published in the IEEE Transactions on Communications.  He is a Fellow of the IEEE.