Zq. Liu et al., Transmit-antennae space-time block coding for generalized OFDM in the presence of unknown multipath, IEEE J SEL, 19(7), 2001, pp. 1352-1364
Transmit antenna diversity has been exploited recently to develop high-perf
ormance space-time coders and simple maximum-likelihood decoders for transm
issions over flat fading channels. Relying on block preceding, this paper d
evelops generalized space-time coded multicarrier transceivers appropriate
for wireless propagation over frequency-selective multipath channels, Multi
carrier preceding maps the frequency-selective channel into a set of flat f
ading subchannels, whereas space-time encoding/decoding facilitates equaliz
ation and achieves performance gains by exploiting the diversity available
with multiple transmit antennas, When channel state information is unknown
at the receiver, it is acquired blindly based on a deterministic variant of
the constant-modulus algorithm that exploits the structure of space-time b
lock codes, To benchmark performance, the Cramer-Rao bound of channel estim
ates is also derived, System performance is evaluated both analytically and
with simulations.