Sequence Block based Compressed Sensing Multiuser Detection for 5G

Mehmood Alam, Qi Zhang

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


    Compressed sensing based multiuser detection (CSMUD) is a promising candidate to cope with the massive connectivity requirements of the massive machine type communication (mMTC) in the fifth generation (5G) wireless communication system. It facilitates grant-free non-orthogonal code division multiple access (CDMA) to accommodate massive number of IoT devices. In non-orthogonal CDMA, the users are assigned with non-orthogonal sequences which serve as their signatures. However, the activity detection which is based on the correlation between the spreading sequences, degrades with increase in the number of users, especially in the lower SNR region. In this paper, to improve the performance of the CSMUD, we propose a sequence block based CSMUD, in which block of sequences is used as signature of the user instead of single sequence. A sequence block based group orthogonal matching pursuit algorithm is proposed to jointly detect the activity and data. The proposed scheme reduces the detection error rate (DER) by a magnitude of two at SNR = 10 dB in a system where the number of users are three times more than the number of available resources with each user having activity probability of 0.1. The DER of the proposed scheme is below 10 {-2} even at activity probability of 0.16 for sequence length of 20 and overloading factor of 300\%. Furthermore, at SNR = 10 dB, the DER of the proposed scheme outperforms the conventional scheme by a magnitude of one for a system with overloading factor of 500\%.

    Original languageEnglish
    Title of host publication2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings
    Number of pages6
    Publication date2018
    Article number8647750
    ISBN (Print)978-1-5386-4727-1
    ISBN (Electronic)9781538647271
    Publication statusPublished - 2018
    Event2018 IEEE Global Communications Conference - Abu Dhabi National Exhibition Centre (ADNEC), Abu Dhabi, United Arab Emirates
    Duration: 9 Dec 201813 Dec 2018


    Conference2018 IEEE Global Communications Conference
    LocationAbu Dhabi National Exhibition Centre (ADNEC)
    Country/TerritoryUnited Arab Emirates
    CityAbu Dhabi
    Internet address
    SeriesIEEE Global Communications Conference (GLOBECOM)


    • 5G
    • Compressive sensing
    • NOMA
    • massive machine type communication
    • multiuser detection
    • sporadic activity


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