David "Cognitive Radio" Reed has posted his comments on spectrum allocation to the FCC on his website. Reed is part of a group of sharp technologists who are advocating that the FCC needs to radically reconsider the way that the RF spectrum is divided up for uses like TV, radio, cellular etc. Reed argues that by switching over to an Internet-like packet-radio network where nearby radios cooperate to share the task to getting all the wireless data -- including video and voice -- to where it needs to be.
Internetworking (on which the Internet is based) consists in understanding that information is independent of the medium that carries it, and can be represented in a universal digital representation – the bit. What the Internet has taught us is that we need not design communications systems for voice bits that differ fundamentally from systems for video bits – instead, by carrying all kinds of traffic over whatever links are available, we can achieve a high degree of efficiency, both technically and economically. Interoperation between networks removes unnecessary transaction costs, enabling new applications to reach economically viable scale without the overhead of purpose-built networks for each new application, and enabling existing applications to be improved in an upward compatible way while allowing legacy versions to coexist.
Digital signal processing is the use of extremely inexpensive and rapidly improving digital technology to handle all aspects of processing signals, including tuning, modulation, coding, and compression, among other functions. Since digital technology enables complex and adaptive algorithms we are able to approach closer and closer to the theoretical limits involved in manipulating and perceiving aspects of the physical world – in the case of radio, directly manipulating and sensing the electromagnetic fields that can be manipulated to carry information. The result has been a dramatic reduction in costs to implement efficient and adaptive techniques such as CDMA, spread spectrum, ultra-wideband radio, agile radio, power management, etc. At the limit, radio technology approaches the point where each radio is a “Cognitive Radio” that can sense its electromagnetic environment directly and modulate electromagnetic fields directly in time and amplitude.
Alex Wood is an addict but won’t give up his smartphone. But he has five strategies for limiting its control over him: “I used to wake up tired. My body would ache and my head felt sore, like waking up with a hangover. Finally, I took control, like attending an AA class for addicts, I […]
We just got the Sport model of the EPIKGO hoverboard at my office. Besides being terribly chic, it’s apparently bulletproof.
Ok, it’s not just solar powered. It’s also an anti-theft, waterproof marvel that keeps my phone’s power bar from ever getting into the red.Sure the idea seems obvious now – tuck a gigantic solar powered battery pack into an exposed slot and turn the wearer into a walking energy harvester. Simple maybe, but I didn’t […]
Yeah, Bluetooth audio is pretty common these days, so why should you care about these earbuds? Look how happy that woman up above looks. She’s got FRESHeBUDS in. Boom. There’s your reason. She’s also at the beach and it appears to be a very nice day.But for the sake of promotion, wireless earbuds are fast becoming the […]
“Gets stuff done,” is a good way to be described by anybody. Especially by coworkers or bosses. Because whether you’re in finance or a children’s librarian, stuff needs to get done. But how do you make sure stuff gets done? You definitely can’t do all the stuff yourself, unless your company/organization/government office consists entirely of you. And […]
Even the most expensive pair of hi-fi headphones can’t match the feeling of bass rumbling through your body at a live show. That’s why music aficionados designed The Basslet, an accessory that reproduces that sensation from your wrist. Does it make your whole body shake with deep subs? Not really, because that would be terrifying, but […]