What Is "Super Wi-Fi"?

Illustration for article titled What Is "Super Wi-Fi"?

The FCC just cleared a path for a new generation of "Super Wi-Fi" technologies. Sounds great! But what the heck is Super Wi-Fi?


Super Wi-Fi is still Wi-Fi...

It's not as though Super Wi-Fi is some entirely alien concept. For all intents and purposes, it's Wi-Fi! The same kind of wireless data transmission you use around your apartment or at the office or waiting in line at Starbucks. It's just much, much more powerful.

...but on a new spectrum...

As John explained previously, pretty much all Wi-Fi activity takes place on the same 2.4GHz or 5GHz frequencies. For the first time in 25 years, though, the FCC has opened up a sizable new block of unlicensed spectrum, this time between 50MHz and 700MHz.

...that lives in between your TV channels...

Ever since television went entirely digital, folks like Google have been lobbying, literally, to free up the airwaves between channels. The so-called "white spaces" would otherwise have been lying around unused or been subject to prohibitive regulatory precautions.


...that's much more powerful than what we have today...

Unlike current Wi-Fi airwaves, whose reach can be measured in feet, the spectrum that would carry Super Wi-Fi would be able to travel for several miles because of that lower frequency. Through brick walls, even—something your Linksys really struggles with. You can also anticipate download speeds of 15Mbps to 20Mbps—about as fast as a cable modem.


...that shouldn't interfere with your regularly scheduled programming...

Back in 2008, when the white space plan was first approved, the biggest concern was that using these airwaves for data transmission could interfere with TV signals. To mitigate those fears, white space devices will be required to query a special geolocation database, ensuring no signals are crossed.


...and that will have (literally) far-reaching benefits...

The advantages are already apparent. Google, for instance, already has a trial running in a Logan, Ohio hospital that's giving first responders and the hospital grounds alike super-speedy broadband. Wilmington, NC uses white-space to send real-time feeds from traffic and security cameras. And eventually, you would potentially be able to access your home Wi-Fi from several blocks away.


...though maybe not for a while.

So far, most of what we know about how the white space will be used is based on conjecture. There may be some proof-of-concept devices early next year at CES, and there may be more mass production of products in a year or two. But the first Super Wi-Fi projects are likely to be medical, municipal, large-scale. How long it takes for us to be always connected from anywhere and anything? That's up to the inventors and entrepreneurs to decide. [FCC (pdf)]

Illustration by Sam Spratt (reference from The Incredibles). Check out Sam's portfolio and become a fan of his Facebook Artist's Page.




I remember when one of the original members of the ATSC consortium came and talked to a class i had, he made mention of this bandwidth and spectrum. He told us that something that was used as a push for digital tv was that this bandwidth in the low frequencies could be freed up for other uses (at the time it was considered for emergency services and responders). He told us this was smoke and mirrors, strait up.

As a PhD in Antenna design he said that to effectively harness low frequency digital spectrum would require a very large, very ungainly antenna. The laws of physics require it. Broadcast of low frequency bandwidth requires large antennae, he argued, and those physics wouldn't change just because the signal was digital.

I mean, have you seen a broadcast tower? Granted they are using high power, but the physics of the antena design are the same, according to him. It will be interesting how small routers are supposed to be able to conquer this physical limitation. Maybe they should talk to Apple, I here they are Antena experts.