Designing optimum mother constellation and codebooks for SCMA

Mehmood Alam, Qi Zhang

    Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review


    Sparse code multiple access (SCMA) is a nonorthogonal codebook based multiple access scheme, proposed to cope with the heterogeneous and challenging performance requirements for mission critical communication and massive machine-type communication in the fifth generation wireless system. In SCMA the codebooks are the main sources of performance improvement, which are generated based on the mother constellation. In this paper, a systematic sub-optimal approach of designing the mother constellation is proposed and a unified metric is derived to obtain the optimum codebooks using a specific mother constellation. It is demonstrated that the new mother constellation outperforms the existing mother constellations in terms of bit error rate (BER) performance. Moreover, it is shown that the optimum codebook obtained based on the unified metric can guarantee the optimum BER performance of the system.

    Original languageEnglish
    Title of host publication2017 IEEE International Conference on Communications, ICC 2017 : ICC
    EditorsDavid Gesbert, Merouane Debbah, Abdelhamid Mellouk
    Number of pages6
    Publication date2017
    Article number7996539
    ISBN (Electronic)978-1-4673-8999-0
    Publication statusPublished - 2017
    EventIEEE International Conference on Communications 2017 - Palais des Congrès - Porte Maillot, Paris, France
    Duration: 21 May 201725 May 2017


    ConferenceIEEE International Conference on Communications 2017
    LocationPalais des Congrès - Porte Maillot
    Internet address
    SeriesIEEE International Conference on Communications


    • 5G
    • Non-orthogonal multiple access
    • machine type communication


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