
Today’s Spotlight features a photograph, taken by
M. Scott Brauer, of Dana Weinstein (right), the Steve and Renee Finn Career Development Assistant Professor of Electrical Engineering and Computer Science at MIT; and Laura Popa, a graduate student in physics.
The way in which radio spectrum is currently allocated to different wireless technologies can lead to gross inefficiencies. In some regions, for instance, the frequencies used by cellphones can be desperately congested, while large swaths of the broadcast‑television spectrum stand idle.
One solution to that problem is the 15‑year‑old idea of ‘cognitive radio,’ in which wireless devices would scan their environments for vacant frequencies and use these for transmissions.
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