Analysis of NOMA-Based Retransmission Schemes for Factory Automation Applications

New use cases and applications in factory automation scenarios impose demanding requirements for traditional industrial communications. In particular, latency reliability are considered as some of the most representative Key Performance Indicators (KPI) that limit technological choices addressing wireless Indeed, there is a considerable research effort ongoing area systems, not only from academia, but also companies, towards novel solutions fit Industry 4.0 KPIs. A major limitation architectures related to harsh nature propagation channel. Accordingly, this paper addresses these challenges by studying performance joint different retransmission schemes combination with Non-Orthogonal Multiple Access (NOMA) techniques. Two general have been tested: time-based spatial diversity-based retransmissions. An adaptive injection level NOMA solution has combined improve critical information. all cases, particular set simulations carried out varying main parameters, such modulation, code rate level. Moreover, impact number transmitters relation communication analyzed. Results show retransmissions overcome considerably obtained time-domain while maintaining assumable rates.