Simple and robust transmit diversity based free-space optical communications for 5G and beyond networks

A contemporary survey on free space optical communication: Potentials, technical challenges, recent advances and research direction

“…Recently, numerous research works conducted focusing on MIMO-OSTBC FSO applications due to higher diversity gain and wide range of FSO applications [402]- [405]. Besides the OSTBC, the RC scheme outperforms than OSTBC in terms of diversity gain but the RC applications with MIMO is challenging because of timing asynchronous alignment between transceivers and thereby, resulting the time difference of signal propagation [406]. The use of repetition coding in MIMO FSO systems endeavoring to combat turbulence effects by introducing redundancy is studied in [407].…”