Near Maximum Likelihood Blind Detection of Space-Time Coded Modulations

Zhi Ding
University of California, Davis

Thursday, May 6, 2010 at 1:00pm
Engr IV 57-124 Maxwell Room

Abstract

Space-time block codes have been established as powerful tools that provide robust wireless communication links with high diversity for wireless multi-input-multi-output (MIMO) channels. It should be noted that MIMO channels require longer training to estimate. To overcome the need of training data for channel estimation, we present a new approach to blind equalization for generalized orthogonal space-time block codes. Existing algorithms are unable to estimate channels when applied with full-rate orthogonal space time codes such as the popular Alamouti code. Unlike these known methods, our proposal does not suffer from such limitations. This new method takes the form of linear programming and is globally convergent. We exploit the implicit structure of orthogonal space-time block codes to cast the problem as linear programming to be solved efficiently. Analysis of the proposed algorithms establishes full diversity without channel knowledge with detection performance comparable to the optimum maximum-likelihood (ML) detection. Moreover, for suitably designed space-time block codes, we can integrate the dependency of zero-forcing detectors to simultaneously recover multiple encoded data streams.

Biography
Zhi Ding is the Child Family Endowed Professor of Engineering and Entrepreneurship at the University of California, Davis. He received his Ph.D. degree in Electrical Engineering from Cornell University in 1990. From 1990 to 1998, he was a faculty member of Auburn University. From 1998-2000, he was a faculty member of Electrical and Computer Engineering at the University of Iowa. He joined the University of California, Davis in 2000 as a professor of Electrical and Computer Engineering. Currently, he is also a guest Changjiang Chair Professor of the Southeast University in Nanjing, China.

Prof. Ding is a Fellow of the IEEE. Professor Ding served as associate editor for IEEE Transactions on Signal Processing from 1994-1997 and 2001-2004. He served as associate editor for IEEE Signal Processing Letters from 2002-2005. He was a member of the Editorial Board of the IEEE Signal Processing Magazine. He served as the Technical Program Chair for COMSOC's Globecom-2006. Prof. Ding was a member of IEEE Signal Processing Society's Technical Committee on Statistical Signal and Array Processing (1994-1998) and a member of Technical Committee on Signal Processing for Communications (1998-2003). He also served on the IEEE Signal Processing Society Technical Committee on Multi-Media Signal Processing (2002-2005). Prof. Ding was named as 2004-6 Distinguished Lecturer by the Circuits and Systems Society and is a Distinguished Lecturer of the IEEE Communications Society for the term 2008-09.