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High reliability will be required even in Internet of Things (IoT) communications in the near future for control purposes. To enhance reliability, both uplink (UL) and downlink (DL) communication quality must be considered. In this paper, we focus on the improvement of DL physical layer communication. To enhance the reliability of DL, the use of spatial diversity is a promising technique. We deal with two transmit diversity (TD) techniques, space-time block coding (STBC) and cyclic delaydoi:10.1587/comex.2020xbl0037 fatcat:utpo4e3jazcftkczobhpu3ra7m