Description: Many papers have extended STBC design to frequency-selective
channels. In [6], STBC has been proposed for single-carrier transmission, which can achieve maximum space-delay diversity in rich
scattering channels. The transmission formats proposed in [6] subsume
those of [7], [8], which present time-reversal STBC at the transmitter
to achieve transmit diversity. Multicarrier transmission systems have
been considered in [9]–[11]. A space–time–multipath coded system is
developed in [12] using digital phase sweeping (DPS) in the frequency
domain or circular delaying in the time domain, which guarantees
the maximum possible space-delay diversity, and has full rate for any
number of transmit–receive antennas. Note that the aforementioned
algorithms all require the channel to be constant over the entire
space–time codeword
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