Overview of Space-Time Wireless Communications in Quasi-Static Rayleigh Flat Fading Channels
October 2004
Robert M. Taylor, Jr., The MITRE Corporation
ABSTRACT
This paper presents a brief overview of spacetime
algorithms for communication systems operating
in quasi-static Rayleigh flat fading environments. The
space-time algorithms exploit a multi-input multi-output
(MIMO) channel and are designed to meet criteria
for optimality under three different channel state
information (CSI) conditions: 1) CSI at receiver and
transmitter, 2) CSI at receiver but not transmitter, and
3) CSI at neither receiver or transmitter. We analyze
the theoretical capacities of the MIMO channels and
give the design criteria for space-time codes (STC)
under each condition. We briefly describe Grassmannian
beamforming (quantized beamforming), space-time block
coding (STBC), space-time trellis coding (STTC), and
unitary space-time modulation (USTM) for a 2 x 2 MIMO
system operating at a spectral efficiency of 2 bps/Hz. We
show through simulation the comparative performance of
each of the space-time transmission schemes presented.
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Additional Search Keywords
space-time coding, performance comparison,
space-time block codes, space-time trellis codes,
unitary space-time modulation
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