MU-MIMO-OFDM with Analog Beamforming and Spreading Codes for User Separation

Kei Nakahara, Kosuke Terui, Yukitoshi Sanada

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

    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 on top of analog beamforming with analog-digital hybrid massive MIMO. Multiuser MIMO scheme suffers from interference among terminals caused by inaccurate information of channel responses. The channel state information (CSI) of the terminals are outdated owing to a Doppler shift if there is a time lag between channel estimation and CSI feedback. Thus, this paper proposes an MU-MIMO-OFDM scheme with analog-digital hybrid massive MIMO and orthogonal spreading codes that separates signals for mobile terminals. Numerical results obtained through computer simulation show that on WINNER II Umi NLOS channel the proposed scheme improves bit error rate (BER) performance by 1.0dB at a bit error rate of 10-3 in comparison with the conventional MU-MIMO.

    Original languageEnglish
    Title of host publicationISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages96-101
    Number of pages6
    ISBN (Electronic)9781538657713
    DOIs
    Publication statusPublished - 2018 Nov
    Event2018 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2018 - Ishigaki Island, Okinawa, Japan
    Duration: 2018 Nov 272018 Nov 30

    Publication series

    NameISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems

    Conference

    Conference2018 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2018
    CountryJapan
    CityIshigaki Island, Okinawa
    Period18/11/2718/11/30

    ASJC Scopus subject areas

    • Artificial Intelligence
    • Computer Networks and Communications
    • Computer Science Applications
    • Signal Processing

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  • Cite this

    Nakahara, K., Terui, K., & Sanada, Y. (2018). MU-MIMO-OFDM with Analog Beamforming and Spreading Codes for User Separation. In ISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems (pp. 96-101). [8923351] (ISPACS 2018 - 2018 International Symposium on Intelligent Signal Processing and Communication Systems). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISPACS.2018.8923351