Systems Seminar
Efficient Signaling Schemes for Wideband Space-Time Wireless Channels
Using Channel State Information
Prof. Barry D. Van Veen
UW ECE Department
Abstract
An orthogonal decomposition of a general wideband space-time
multipath channel is presented. Antenna arrays are assumed at both
the transmitter and receiver. When channel state is known at the
transmitter, this decomposition provides a flexible framework for
managing and exploiting the available degrees of freedom in the
wireless channel. Signaling schemes that trade throughput for bit
error rate are presented. The scheme that minimizes bit error rate
for a single user is shown to be a rank-one space-time beamformer
which couples the transmitted signal to the most dominant channel
mode. Multi-stream transmission is implemented using space-time
beamformers to couple the different streams into orthogonal channel
modes. A power allocation scheme that maximizes throughput subject
to a maximum bit error rate constraint is also proposed. Issues that
arise in multiuser applications of this framework are noted.
Time and Place: Wed., Apr. 4, at noon in 4610 Engr. Hall.
******* NOTE SPECIAL TIME ^^^^
SYSTEMS SEMINAR WEB PAGE:
http://www.cae.wisc.edu/~gubner/seminar/