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First Eigenmode Transmission by High Efficient CSI Estimation for Multiuser Massive MIMO Using Millimeter Wave Bands.

Kazuki Maruta1, Tatsuhiko Iwakuni2, Atsushi Ohta3

  • 1NTT Access Network Service Systems Laboratories, Nippon Telegraph and Telephone Corporation, 1-1 Hikarino-oka, Yokosuka-shi, Kanagawa 239-0847, Japan. maruta.kazuki@lab.ntt.co.jp.

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Summary

This study enhances multiuser massive MIMO for 5G millimeter wave communication by exploiting the first eigenmode to combat channel variations. A simplified beamforming scheme offers comparable performance, paving the way for practical, high-capacity systems.

Keywords:
channel estimationchannel time variationfirst eigenmodemassive MIMOmillimeter wavemultiuser MIMO

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Mobile Networks

Background:

  • 5th generation mobile communications (5G) require significant improvements in transmission rate and system capacity.
  • Millimeter wave (mmWave) bands offer rich spectrum but suffer from propagation loss, limiting coverage.
  • Massive MIMO and multiuser MIMO enhance capacity but are degraded by channel time variations and inter-user interference.

Purpose of the Study:

  • To investigate the effectiveness of multiuser massive MIMO using the first eigenmode for 5G mmWave systems.
  • To develop a simplified beamforming scheme for improved robustness against channel time variations.
  • To achieve high system capacity and practical millimeter wave communication.

Main Methods:

  • Exploiting the first eigenmode in multiuser massive MIMO transmission.
  • Utilizing the Line-of-Sight (LoS) component for beamforming in LoS-dominant channels.
  • Proposing a simplified beamforming scheme based on efficient channel state information (CSI) estimation.

Main Results:

  • The first eigenmode, dominated by the LoS component, enhances robustness against channel time variation in LoS environments.
  • The simplified beamforming scheme achieves throughput performance comparable to rigorous first eigenmode transmission.
  • The proposed scheme demonstrates effectiveness for multiuser massive MIMO in mmWave communication.

Conclusions:

  • Multiuser massive MIMO exploiting the first eigenmode is effective for 5G mmWave communication.
  • A simplified beamforming approach offers a practical solution for robust and high-capacity mmWave systems.
  • This research facilitates the deployment of practical millimeter wave communication with enhanced system capacity.