A precoding approach for reduced complexity channel estimation for OFDM systems with transmit diversity is presented. Two different OFDM schemes that employ the precoding are investigated: the first one is based on space-time coding, the second is based on a transmit diversity using an optimal design of symbols for channel estimation. The first scheme reduces the size of the inverse matrix in channel estimation to half of the existing method at the expense of slightly degraded BER performance. The second does not require any matrix inversion and hence achieves much complexity saving but has a BER performance degradation at moderate and high SNR and a better BER performance at low SNR.
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