Performance comparisons of open-loop transmit diversity schemes for DFT-precoded OFDMA in uplink frequency-selective fading channels

This paper presents performance comparisons based on the block error rate (BLER) of open-loop transmit diversity schemes considering a cubic metric (CM) for discrete Fourier transform (DFT)-Precoded orthogonal frequency division multiple access (OFDMA) in uplink frequency-selective fading channels. The open-loop transmit diversity schemes assumed in the paper are space-time block code (STBC), space-frequency block code (SFBC), single-carrier (SC)-SFBC, cyclic delay diversity (CDD), and frequency switched transmit diversity (FSTD) for two antennas and their combinations for four antennas. We derive the most appropriate open-loop transmit diversity scheme for SC transmission with QPSK and 16QAM modulations and with various channel coding rates employing turbo coding under various propagation channel conditions including the fading maximum Doppler frequency and root mean square (r.m.s.) delay spread, and fading correlation between transmitter/receiver antennas.