The Curious Case of the MMSE Receiver

Event Date: April 25, 2013
Speaker: Professor Aria Nosratinia
Speaker Affiliation: The University of Texas at Dallas
Sponsor: Communications, Networking, Signal & Image Processing
Time: 10:30 AM
Location: MSEE 239
Contact Name: Professor David Love
Contact Phone: (765) 496-6797
Contact Email:

The error curves for digital modulations such as PSK and QAM have a familiar quality: as transmission rate is increased, the curves migrate to higher SNR but their shape is essentially unchanged. For many years it was widely believed that communication systems in general behave in the same way: higher rates require higher SNR, but do not produce qualitatively different behavior.  However, in 2002 an example was discovered where the multi-antenna MMSE (Minimum Mean Squared Error) receiver does not follow this pattern, specifically, its diversity performance significantly degrades at certain rates.  This is especially important considering the popularity of MMSE receivers. This talk describes the evolution of our understanding in the last decade about the performance of MMSE receivers and equalizers in various single-antenna and multi-antenna scenarios. Among the notable successes one can name the exact characterization of the behavior of MMSE single-carrier frequency domain equalizer (SC-FDE), which is used in the uplink of the LTE-advanced wireless standard.  In addition to reviewing recent results in this area, this talk also highlights several open problems.


Aria Nosratinia is Jonsson Distinguished Professor and associate head of the Electrical Engineering Department at the University of Texas at Dallas. He received his Ph.D. in Electrical and Computer Engineering from the University of Illinois at Urbana-Champaign in 1996. He has held visiting appointments at Princeton University, Rice University, and UCLA.  His interests lie in the broad area of information theory and signal processing, with applications in wireless communications. He was the secretary of the IEEE Information Theory Society in 2010-2011 and the treasurer for ISIT 2010 in Austin, Texas. He is currently an area editor for the IEEE Transactions on Wireless Communications, and in the past has served as editor for the IEEE Transactions on Information Theory, IEEE Transactions on Wireless Communications, IEEE Signal Processing Letters, IEEE Transactions on Image Processing, and IEEE Wireless Communications (Magazine). He has been the recipient of the National Science Foundation career award, and is a fellow of IEEE.