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Digital Beamforming Algorithm for 5G Low-SHF Band Massive MIMO

Shohei YOSHIOKA, Satoshi SUYAMA, Tatsuki OKUYAMA, Jun MASHINO, Yukihiko OKUMURA

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Summary :

Towards furthering the industrial revolution, the concept of a new cellular network began to be drawn up around 2010 as the fifth generation (5G) mobile wireless communication system. One of the main differences between the fourth generation (4G) mobile communication system Long Term Evolution (LTE) and 5G new radio (NR) is the frequency bands utilized. 5G NR assumes higher frequency bands. Effective utilization of the higher frequency bands needs to resolve the technical issue of the larger path-loss. Massive multiple-input multiple-output (Massive MIMO) beamforming (BF) technology contributes to overcome this problem, hence further study of Massive MIMO BF for each frequency band is necessary toward high-performance and easy implementation. In this paper, then, we propose a Massive MIMO method with fully-digital BF based on two-tap precoding for low super high frequency (SHF) band downlink (DL) transmissions (called as Digital FBCP). Additionally, three intersite coordination algorithms for Digital FBCP are presented for multi-site environments and one of the three algorithms is enhanced. It is shown that Digital FBCP achieves better throughput performance than a conventional algorithm with one-tap precoding. Considering performance of intersite coordination as well, it is concluded that Digital FBCP can achieve around 5 Gbps in various practical environments.

Publication
IEICE TRANSACTIONS on Communications Vol.E102-B No.8 pp.1371-1381
Publication Date
2019/08/01
Publicized
2019/02/20
Online ISSN
1745-1345
DOI
10.1587/transcom.2018TTP0020
Type of Manuscript
Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category

Authors

Shohei YOSHIOKA
  NTT DOCOMO, INC.
Satoshi SUYAMA
  NTT DOCOMO, INC.
Tatsuki OKUYAMA
  NTT DOCOMO, INC.
Jun MASHINO
  NTT DOCOMO, INC.
Yukihiko OKUMURA
  NTT DOCOMO, INC.

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