Systems Seminar
Optimal Space-Time Group Codes
Prof. Nigel Boston
UW Math & ECE Departments
Abstract
Hassibi, Hochwald, Shokrollahi, and Sweldens proposed that for MIMO
space-time coding for an unknown channel, a constellation of unitary matrices
that form a group should be used.
Design criteria suggested that fixed-point-free
groups are best, and one with three antennas was implemented in a corridor at
Lucent Technologies and performed well. Later Shokrollahi discovered an eight
antenna constellation of size 4896 that performed better than fpf groups at
reasonable SNR. This work, which is joint work with Sirin Nitinawarat, takes
advantage of the fact that all finite groups of n-by-n complex matrices are
known for small n, to obtain for a given number of transmit antennas, rate,
and SNR, the best space-time group code.
Time and Place: Wed., Oct. 27, at 3:30 in 4610 Engr. Hall.
SYSTEMS SEMINAR WEB PAGE:
http://homepages.cae.wisc.edu/~gubner/seminar/