Personal Information

  • Name: Naoki Ishikawa (石川 直樹)
  • Nationality: Japan
  • Membership: Member of IEEE and IEICE.
  • Society: IEEE ComSoc and VTS. IEICE CS.
  • Email: contact [at]
  • Address: 3-4-1, Ohzuka-higashi, Asaminami-ku, Hiroshima-shi, Japan.


I was born in Kanagawa, Japan, in 1991. In March 2014, I obtained a B.E. degree with highest distinction in Computer and Information Sciences from Tokyo University of Agriculture and Technology, Tokyo, Japan. I also gained an M.E. degree with highest distinction from the same university in March 2015 and graduated one year ahead of the normal schedule. In March 2017, I completed a Ph.D. degree in Electronic and Information Engineering under the supervision of Dr. Shinya Sugiura and Dr. Keiichi Kaneko, as a research fellow of the Japan Society for the Promotion of Science. I am currently an assistant professor in the Graduate School of Information Sciences, Hiroshima City University, Japan.

I have worked on the differential MIMO encoding, which dispenses with the channel estimation overhead of wireless systems. My research topic also includes the index-modulation for millimeter wave, optical, and multicarrier communications. Please check my publications list for further details.

Curriculum Vitae (PDF) Google Scholar ResearchGate ORCiD

Research Topics

A Survey on Spatial Modulation

[1] IEEE COMST 2018.

Differential Spatial Modulation

[2] IEEE TSP 2018. [3] IEEE TCOM 2017.
[4] IEEE TVT 2017. [5] IEEE WCL 2014.

Massive Differential Spatial Modulation

[6] IEEE TCOM 2018. [7] IEEE TWC 2017.

Subcarrier-Index Modulation

[8] IEEE Access 2016.

Millimeter-Wave Communications

[9] IEEE TVT 2016.

Visible Light Communications

[10] J. Lightwave Technol. 2015.

Popular Contents

IEEE journal & magazine papers published by research institutions in Japan

This web page summarizes a list of IEEE papers published by researchers in Japan.


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