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Weighted Space Time Turbo Trellis Codes

Researchers: Branka Vucetic, Yohghui Li, Jinhong
Yuan and Agus Santoso
Support: ARC Discovery Grant, Norman I Price
Scholarship and Girling Watson Fellowship
Space-time coding, carried out in both the time and space
domains, is a practical technique that enables to approach
the MIMO system capacity bounds. The simplest example
of space-time coding is the Alamouti scheme, which has
been adopted as a standard for the third generation of WCDMA
cellular radio networks and IEEE 802.16
broadband wireless access systems. It is simple to
implement but has no coding gain and its performance is
far from the MIMO system capacity limit. Space-time
trellis codes achieve substantial coding and diversity
gains and are simple to implement for small numbers of
transmit antennas. Layered space-time codes (LST), with
time domain coding only, achieve high coding and
diversity gains but the detection/decoding is quite
challenging for a large number of transmit antennas.
Space-time turbo trellis coded modulation schemes,
outperform the other known ST codes. All these space-
Telecommunications Laboratory
time coding schemes use channel state information (CSI)
at the receiver only. Substantial further improvements are
possible by exploiting CSI both at the transmitter and the
receiver, as demonstrated in our recent results in MIMO
systems with transmit antenna selection. In this project
the performance and design of space-time turbo trellis
codes with variable power across transmit antennas if
both full and partial CSI are available at the transmitter
will be investigated.