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Fujii Lab
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The lab studies mobile communications that make effective use of limited frequency spectrum.
AboutAbout the lab
Research on mobile communications that use frequencies effectively
Fujii Lab studies how to advance mobile communications, such as mobile phones and wireless LANs, from a variety of perspectives.
As wireless systems multiply and frequency bandwidth runs short, the lab studies topics such as cognitive radio, which recognizes the surrounding radio environment and uses bands that are not being effectively utilized.
Wireless ad hoc networks, in which terminals autonomously form a network among themselves, and wireless protocols, which define the rules of transmission procedures, are also research topics.
As a lab policy, students carry out world-class research from their fourth year of undergraduate study.
Key terms
- Cognitive radio
- A wireless technology that recognizes the surrounding radio environment, autonomously changes its settings, and makes secondary use of unused frequency bands
- Wireless ad hoc network
- A communication network that terminals form autonomously. Terminals along the way relay data to terminals outside direct communication range
- Protocol
- Rules of transmission procedure that define what kind of packets to send and when
- Wireless sensing
- A technology that grasps the state of the surrounding radio environment and estimates its parameters
NewsLab news
View More ↗ResearchResearch themes
This lab conducts research from a variety of perspectives to advance mobile communications, as represented by mobile phones and wireless LANs. This is a field in which achieving high-capacity communication inexpensively and efficiently, and making effective use of frequencies, a limited resource, are required.
*Illustrative imageWireless using unused frequencies
The lab studies cognitive radio, which makes secondary use of unused frequency bands, including technologies for recognizing the surrounding radio environment and parameter settings for secondary use.
*Illustrative imageBuilding radio environment databases
The lab works on radio environment databases that cognitive radio uses to recognize its surroundings. It studies methods of obtaining information through wireless sensing and algorithms for building the databases.
*Illustrative imageWireless networks formed by terminals themselves
The lab tackles the problem of how to coordinate multiple terminals in wireless ad hoc networks that terminals build autonomously. It also studies networks that support multiple frequencies.
*Illustrative imageRules for wireless communication (protocols)
The lab studies wireless protocols, which define the rules of transmission procedures: what kind of packets to send and when. It considers effective use of radio resources and adaptability to applications.
MembersFaculty
The members of Fujii Lab are faculty, a secretary, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTakeo Fujii
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “RADWIN-point-to-point-wireless-Huntington-Beach” 1-555-confide / CC BY-SA 4.0 (cropped)
- Wireless using unused frequencies: “3D battery charger RF spectrum over time” Spekki2000 / CC BY-SA 4.0 (cropped)
- Building radio environment databases: “Radio map example” Grelolaconico / CC0 (cropped)
- Wireless networks formed by terminals themselves: “OLPC-mesh network-friends view” OLPC user: Eben / CC BY-SA 2.5 (cropped)
- Rules for wireless communication (protocols): “Wi-Fi Channels 1,5,9,13 hexagonal reuse pattern” GliderMaven / CC BY-SA 4.0 (cropped)
- Related lab (Ohzahata Lab): “Cellular network antenna mount Haringey London” Acabashi / CC BY-SA 4.0 (cropped)
- Related lab (Ohama-Santoso Lab): “NASA secure communication console at National Cryptologic Museum.agr” ArnoldReinhold / CC BY-SA 4.0 (cropped)
- Related lab (Ichino Lab): “Fingerprint reader 2” Flanoz / CC0 (cropped)
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