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ITU Journal on Future and Evolving Technologies, Volume 2 (2021), Issue 6
[11] H. Ogawa, G. K. Tran, K. Sakaguchi, and [22] 3GPP TR 38.901, “3rd Generation Partnership
T. Haustein, “Traffic Adaptive Formation of Project; Technical Specification Group Radio
mmWave Meshed Backhaul Networks,” IEEE Access Network; Study on channel model for
ICC, May 2017. frequencies from 0.5 to 100 GHz
(Release 15)”, V15.0.0, Jun. 2018.
[12] 3GPP TS 38.174, “NR; Integrated Access and
Backhaul (IAB) radio transmission and [23] T. Bai and R. W. Heath, Jr., “Coverage and rate
reception (Release 16)”, V16.1.0, Jan. 2021. analysis for millimeter-wave cellular
networks,” IEEE Trans. Wireless Commun.,
[13] J. Du, E. Onaran, D. Chizhik, S. Venkatesan, and
R. A. Valenzuela, "Gbps user rates using vol. 14, no. 2, pp. 1100-1114, Feb. 2015.
mmWave relayed backhaul with high-gain [24] Y. Zeng and R. Zhang, “Millimeter wave MIMO
antennas", IEEE J. Sel. Areas Commun., vol. 35, with lens antenna array: A new path division
no. 6, pp. 1363-1372, Jun. 2017. multiplexing paradigm,” IEEE Trans.
Commun., vol. 64, no. 4, pp. 1557-1571,
[14] S. Gong, X. Lu, D. T. Hoang, D. Niyato, L.Shu,
D. I. Kim, and Y. Liang, "Toward Smart Apr. 2016.
Wireless Communications via Intelligent
Reflecting Surfaces: A Contemporary Survey," AUTHORS
IEEE Commun. Surv. Tutor., vol. 22, no. 4, Kei Sakaguchi received an M.E.
pp. 2283-2314, 2020. degree in information processing
[15] G. Yang and M. Xiao, "Performance Analysis of from Tokyo Institute of
Millimeter-Wave Relaying: Impacts of Technology in 1998, and a Ph.D
Beamwidth and Self-Interference", IEEE degree in electrical & electronics
Trans. Commun., vol. 66, issue 2, Feb. 2018. engineering from Tokyo Institute
of Technology in 2006. Currently,
[16] H. Abbas and K. Hamdi, "Millimeter Wave he is working at the Tokyo
Communications over Relay Networks", IEEE Institute of Technology in Japan as a dean in Tokyo
WCNC, Apr. 2018. Tech Academy for Super Smart Society and as a
[17] Y. Sugihara and K. Sakaguchi, “mmWave professor in the School of Engineering. At the same
massive analog relay MIMO for improvement time, he is working for oRo Co.,Ltd. in Japan as an
of channel capacity”, IEEE WCNCW, Apr. 2020. outside director. He received the Outstanding Paper
Awards from SDR Forum and IEICE in 2004 and
[18] F. Sohrabi and W. Yu, “Hybrid Analog and 2005 respectively, and three Best Paper Awards
Digital Beamforming for mmWave OFDM from IEICE communication society in 2012, 2013,
Large-Scale Antenna Arrays,” IEEE J. on Sel. and 2015. He also received the Tutorial Paper
Areas in Commun., vol. 35, no. 7, Award from IEICE communication society in 2006.
pp. 1432-1443, Jul. 2017. His current research interests are in B5G cellular
[19] Z. Shen, R. Chen, J. G. Andrews, R. W. Heath, networks, millimeter-wave communications,
and B. L. Evans, “Low complexity user wireless energy transmission, V2X for automated
selection algorithms for multiuser MIMO driving, and super smart society. He is a fellow of
systems with block diagonalization,” IEEE IEICE, and a senior member of IEEE.
Trans. Signal Process., vol. 54, no. 9, Takumi Yoneda received a
pp. 3658-3663, Sep. 2006. B.E. degree in electrical and
[20] Y. Chang and K. Araki, “Simplified capacity- electronic engineering from
based user scheduling algorithm for Tokyo Institute of Technology
multiuser MIMO systems with block in 2020. He is currently
diagonalization,” IEICE Trans. Commun., vol. pursuing his M.E. degree in the
E940B, no. 10, pp. 2837-2846, Oct. 2011. Department of Electrical &
Electronic Engineering, Tokyo
[21] E. W. Dijikstra, “A note on two problems in Instiitute of Technology. His
connection with graphs”, Numerishe current research interests are millimeter-wave
Mathmatik, vol. 1, no. 1, pp. 269-271, 1959. communications and cellular networks. He is a
student member of IEICE and IEEE.
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