AoD-adaptive subspace codebook for channel feedback in FDD massive MIMO systems

Wenqian Shen, Linglong Dai, Guan Gui, Zhaocheng Wang, Robert W. Heath, Fumiyuki Adachi

    研究成果: Conference contribution

    16 被引用数 (Scopus)

    抄録

    Channel feedback is essential for frequency division duplex (FDD) massive multiple-input multiple-output (MIMO) systems to realize precoding and power allocation. Traditional codebooks for channel feedback, where the required number of feedback bits is proportional to the number of base station (BS) antennas, can not scale up with massive MIMO due to the large number of BS antennas. To solve this problem, in this paper, we propose an angle-of-departure (AoD) adaptive subspace codebook to reduce the codebook size and feedback overhead. Specifically, by leveraging the concept of angle coherence time, which implies that the path AoDs vary much slower than path gains, we propose an AoD-adaptive subspace codebook to quantize the channel vector in a more accurate way. We also provide performance analysis of the proposed AoD-adaptive subspace codebook, where we prove that the required number of feedback bits only scales linearly with the number of resolvable AoDs, which is much smaller than the number of BS antennas. This quantitative result is also verified by simulations.

    本文言語English
    ホスト出版物のタイトル2017 IEEE International Conference on Communications, ICC 2017
    編集者Merouane Debbah, David Gesbert, Abdelhamid Mellouk
    出版社Institute of Electrical and Electronics Engineers Inc.
    ISBN(電子版)9781467389990
    DOI
    出版ステータスPublished - 2017 7月 28
    イベント2017 IEEE International Conference on Communications, ICC 2017 - Paris, France
    継続期間: 2017 5月 212017 5月 25

    出版物シリーズ

    名前IEEE International Conference on Communications
    ISSN(印刷版)1550-3607

    Other

    Other2017 IEEE International Conference on Communications, ICC 2017
    国/地域France
    CityParis
    Period17/5/2117/5/25

    ASJC Scopus subject areas

    • コンピュータ ネットワークおよび通信
    • 電子工学および電気工学

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