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March 28, 2011

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Michael Elling

Brough,

As a wireless analyst speaking about capacity issues and as an investment banker raising money for a femto-cell company I used to explain that all wireless gets reused, with wifi, based on a 300 ft radius, being almost infinite reuse.

All spectrum is essentially shared.

Michael

brough

Michael, the license-exempt spectrum that Wi-Fi uses certainly gets reused, spatially, and in many other ways, e.g. it's also shared with Bluetooth, Zigbee, microwave ovens, etc. Most important, the use of advanced modulations, directional antennas, MIMO, beam steering and so forth means the amount of sharing that is possible is increasing every year. Typically we see these technology advances deployed in the license-exempt bands first, as that's where anyone can do (almost) anything. So that's the spectrum where we see the most innovation.

Unfortunately, the license exempt bands represent a small fraction of the available spectrum. Most spectrum is reserved for specific licensees and dedicated for use with legacy (i.e. inefficient) technologies. What's worse, most spectrum is not even utilized most of the time in most places, including even downtown urban areas. See slides 17, 18, 19 here:
http://www.slideshare.net/Brough/open-spectrum-physics-engineering-commerce-and-politics-1465804

Thanks, Brough

Camarad

Thanks for the information! As a wireless analyst speaking about capacity issues and as an investment banker raising money for a femto-cell company I used to explain that all wireless gets reused, with wifi, based on a 300 ft radius, being almost infinite reuse.

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