This article addresses two key challenges in the multibeam multicast nonorthogonal multiple access (MB-MC-NOMA) scheme and respective beamforming design problems in satellite systems. Achieving the max-min fairness and maximum sum-rate among multiple multicast groups of users are jointly considered in a theoretical information framework. It is assumed that each frame contains information of multiple users in multicast transmission. Therefore, contrary to the unicast linear precoding, we have developed the multicast linear precoding with mapping function considering tradeoffs to deal with the lack of the spatial degree of freedom. In our proposed scheme, each beamforming vector conveys information to more than one group of users in an NOMA framework, relying on the superposition techniques at the transmitters and successive interference cancellation (SIC) at the receivers. We have derived the capacity rates achievable in each beam, proposing the methods to maximize the minimum rate and weighted sum-rate. Considering the dependency of the broadcasting power and the respective achievable rates, the equivalent channel and water-filling algorithm for the MB-MC-NOMA is developed; as such, the optimal transmit power density for the groups of users within multiple beams are efficiently computed. The extensive simulation results confirm the proposed theoretical findings, providing a considerable boost in both minimum-rate and sum-rate with respect to state-of-the-art MB-MC satellite systems.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    On Optimal Power Allocation in Multibeam Multicast NOMA for Satellite Communication Systems


    Beteiligte:


    Erscheinungsdatum :

    01.10.2023


    Format / Umfang :

    2231685 byte




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    EFFECTS OF CHANNEL PHASE IN MULTIBEAM MULTICAST SATELLITE PRECODING SYSTEMS

    Artiga, Xavier / Vazquez, Miguel Angel | TIBKAT | 2021



    A Genetic Algorithm for Joint Power and Bandwidth Allocation in Multibeam Satellite Systems

    Paris, Aleix / Del Portillo, Inigo / Cameron, Bruce et al. | IEEE | 2019