Sparse code multiple access (SCMA) represents a paradigm shift from conventional multiple access concept and is considered as a promising candidate multiple access technique for the fifth generation (5G) wireless communication systems. In this paper, we investigates the downlink resource allocation problem in SCMA systems. Taking user fairness into account, we formulate a problem to maximize the sum of logarithmic user data rate by jointly optimizing the subcarrier assignment and power allocation. The formulated problem is combinatorial and non-convex. To tackle this problem, we first convert the power allocation problem into a standard convex problem by assuming the subcarrier assignment is fixed. Based on this, then the algorithm ``remove and reallocate'' for joint power allocation and subcarrier assignment is proposed with low complexity. Simulation results demonstrate that our proposal is near-optimal and can achieve good performance over both traditional OFDM systems and random subcarrier assignment in SCMA systems.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Joint Subcarrier Assignment and Power Allocation in Downlink SCMA Systems


    Beteiligte:
    Zhu, Wenfeng (Autor:in) / Qiu, Ling (Autor:in) / Chen, Zheng (Autor:in)


    Erscheinungsdatum :

    2017-09-01


    Format / Umfang :

    255079 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Downlink Power Allocation in SCMA with Finite-Alphabet Constraints

    Cui, Jingjing / Fan, Pingzhi / Lei, Xianfu et al. | IEEE | 2017



    Antenna-Resource-Based SCMA in Downlink Multiuser Transmission Systems

    Zhang, Yi-Peng / Yu, Qi-Yue / Liu, Zi-Jing et al. | IEEE | 2020



    Multi-Stage Message Passing Algorithm for SCMA Downlink Receiver

    Zhang, Han / Han, Shuai / Meng, Wei-Xiao | IEEE | 2016