Performance Study of SCMA Codebook Design

Mehmood Alam, Qi Zhang

    Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperConference articleResearchpeer-review


    Sparse code multiple access (SCMA) is a non- orthogonal codebook (CB) based multiple access scheme, proposed to cope with the heterogeneous and challenging performance requirements for mission critical communication and massive machine-type communication (MTC) in the fifth Generation (5G) wireless system. In this paper, the performance of SCMA has been studied and analyzed, considering the impact of the energy diversity and minimum Euclidean distance of the mother constellation, overloading of the system and the layer specific operators for codebooks generation. An optimized codebooks generation method for four ring star QAM based signaling constellation is proposed. It is demonstrated that by selecting the optimum design parameters, the bit error rate (BER) can be improved. Moreover, an overloading technique is also proposed to enable higher connectivity at lower decoding complexity.

    Original languageEnglish
    JournalI E E E Wireless Communications and Networking Conference. Proceedings
    Number of pages5
    Publication statusPublished - 2017
    Event2017 IEEE Wireless Communications and Networking Conference: WCNC - Hyatt Regency San Francisco, San Francisco, United States
    Duration: 19 Mar 201722 Mar 2017


    Conference2017 IEEE Wireless Communications and Networking Conference
    LocationHyatt Regency San Francisco
    Country/TerritoryUnited States
    CitySan Francisco
    Internet address


    • 5G
    • Multiple access
    • Overloading
    • SCMA codebook


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