MU-MIMO-OFDM with spreading codes for user separation

Kei Nakahara, Kosuke Terui, Yukitoshi Sanada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    This paper presents a multiuser (MU)-multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) scheme that realizes signal separation among mobile terminals by spreading codes. In conventional multi-user MIMO systems, the most significant problem is co-channel interference among mobile terminals. The calculation of weight coefficients requires the channel state information (CSI) of all the terminals. Owing to a Doppler shift, the accurate CSI is difficult to obtain for mobile terminals. Signals to the other stationary terminals cause severe interference and beam nulling can not be realized appropriately. Thus, this paper proposes an MU-MIMO-OFDM scheme with orthogonal spreading codes that separates signals for mobile terminals. Numerical results obtained through computer simulation show that the proposed scheme improves bit error rate (BER) performance by 2.5dB at a BER of 10-3 in comparison with the conventional MU-MIMO on a Rayleigh fading channel.

    Original languageEnglish
    Title of host publication2017 IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
    Subtitle of host publicationEngaged Citizens and their New Smart Worlds, PIMRC 2017 - Conference Proceedings
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages1-6
    Number of pages6
    Volume2017-October
    ISBN (Electronic)9781538635315
    DOIs
    Publication statusPublished - 2018 Feb 14
    Event28th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2017 - Montreal, Canada
    Duration: 2017 Oct 82017 Oct 13

    Other

    Other28th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2017
    CountryCanada
    CityMontreal
    Period17/10/817/10/13

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Fingerprint Dive into the research topics of 'MU-MIMO-OFDM with spreading codes for user separation'. Together they form a unique fingerprint.

  • Cite this

    Nakahara, K., Terui, K., & Sanada, Y. (2018). MU-MIMO-OFDM with spreading codes for user separation. In 2017 IEEE International Symposium on Personal, Indoor and Mobile Radio Communications: Engaged Citizens and their New Smart Worlds, PIMRC 2017 - Conference Proceedings (Vol. 2017-October, pp. 1-6). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PIMRC.2017.8292172