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This paper analyzes the performance of low earth orbit (LEO) satellites basedinternet-of-things (IoT) network where each IoT node makes use of multiplesatellites to communicate with the ground station (GS). In this work, weconsider fixed and variable gain amplify-and-forward (AF) relaying protocol ateach satellite where the received signal from each IoT node is amplified beforetransmitting to the terrestrial GS for data processing. To analyze theperformance of this novel LEO satellites based direct access architecture, theclosed-form expressions for outage probability are derived considering twocombining schemes at the GS: (i) selection combining; (ii) maximal ratiocombining. Further, to gain more insights for diversity order and coding gain,asymptotic outage probability analysis at high SNR for both schemes is alsoperformed. Finally, simulation results are presented to validate the analyticalresults derived and also to develop several interesting insights into thesystem performance.

Performance Analysis of Novel Direct Access Schemes for LEO Satellites Based IoT Network