BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:On the Equivalence of TCM Encoders - Frederik Brannstrom\, Assista
 nt Professor at the Department of Signals and Systems\, Chalmers Universit
 y of Technology\, Gothenburg\, Sweden
DTSTART:20120223T100000Z
DTEND:20120223T110000Z
UID:TALK36514@talks.cam.ac.uk
CONTACT:Rachel Fogg
DESCRIPTION:Optimal trellis-coded modulation (TCM) schemes are obtained by
  jointly designing the convolutional encoder and the binary labeling of th
 e constellation. Unfortunately this approach is infeasible for large encod
 er memories or constellation sizes. Traditional TCM designs circumvent thi
 s problem by using a labeling that follows the set-partitioning principle 
 and by performing an exhaustive search over the encoders. Therefore\, trad
 itional TCM schemes are not necessarily optimal. In this paper\, we study 
 binary labelings for TCM and show how they can be grouped into classes\, w
 hich considerably reduces the search space in a joint design. For the part
 icular case of 8-ary modulation the search space is reduced from 40320 to 
 240. Using this classification\, we formally prove that for any channel it
  is always possible to design a TCM system based on the binary-reflected G
 ray code with identical performance to the one proposed by Ungerboeck in 1
 982. Moreover\, the classification is used to tabulate asymptotically opti
 mal TCM schemes.\n \nFredrik Brännström is an Assistant Professor at the
  Department of Signals and Systems\, Chalmers University of Technology\, G
 othenburg\, Sweden. He received his Ph.D. degree in communication theory f
 rom the Department of Computer Engineering\, Chalmers University of Techno
 logy\, Gothenburg\, Sweden\, in 2004. From 2004 to 2006\, he had a Postdoc
 toral position in the Communication Systems Group at the Department of Sig
 nals and Systems\, Chalmers University of Technology. From 2006 to 2010 he
  was a Senior Algorithm Engineer and Principal Design Engineer at Quantenn
 a Communications\, Fremont\, CA. At Quantenna he was part of the system te
 am that developed the PHY layer for the world’s first WiFi 802.11n chip 
 with 4x4 MIMO and LDPC codes operating at 600 Mbps. His research interests
  in communication theory and information theory include coding\, modulatio
 n\, and efficient iterative processing.\n
LOCATION:LR12\, Engineering\, Department of
END:VEVENT
END:VCALENDAR