Abstract
In multiple input single output (MISO) systems, two out of N transmit antennas are selected using delayed feedback. Assuming Alamouti transmit diversity and flat Rayleigh fading channel, we derive expressions of symbol error rate (SER) considering two modulation schemes MPSK and MQAM in simple form. Further, we derive expressions of probability of outage for the considered sub-optimum AS scheme. All the expressions are derived as a function of correlation coefficient (ρ), where ρ denotes correlation between perfect channel state information (CSI) and delayed version of it. We discuss some special cases of the considered system and compare with the prevailing systems. Furthermore, it is proved analytically that the diversity order of the considered system reduces to two for ρ ≠ 1 (not selecting antennas using perfect CSI). We also present simulation results and show that the analytical results are closely matching with them.
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