In Airshark: Detecting Non-WiFi RF Devices using Commodity WiFi Hardware (PDF), researchers from U Wisconsin (Madison) document a firmware for WiFi access points that can detect and dynamically adjust to interference from vacuum cleaners, baby monitors, and other non-WiFi devices that operate in WiFi's radio spectrum. This kind of thing is the backbone of the theory of cognitive radio: devices that can use software defined radio, phased-array antennas, and cleverness to route around other devices in the band, which may, eventually, enable the a lot more data to occupy the radio spectrum. In Airshark's case, the cleverness is in using the wireless cards on the computers and other devices as a sensing array to triangulate on interference.
Airshark taps into the application programming interface of wireless cards used on access points to gather data about radio frequencies in the surrounding environment. The software has been trained to recognize signatures of various devices, and can pick them out from the ambient radio noise with more than 90% accuracy even if signals from multiple such devices are present.
False positives were .39% for environments with four or more interfering devices and using various signal strengths. The researchers found the rate was .068% for signals stronger than -80dBm. "We also found its performance to be comparable to a commercial signal analyzer," according to their research paper "Airshark: Detecting Non-WiFi RF Devices using Commodity WiFi Hardware."
A flashlight review that begins with the promise “I’m about to hike through a remote canyon to an abandoned mine, and I gotta tell you there’s a storm raging outside” should end on an interesting note, and this one does. [via] Disturbing, strange sounds. That’s exactly what I caught on video while filming and documenting […]
Reflectacles, the hyper-reflective Ray Ban-style $75 glasses frames that Scott Urban is Kickstarting have a new feature: now you can get ones doped with materials that reflect the infrared light that CCTVs kick out to let them capture images in low light, which blind cameras’ sensors. Cool!
Typewriter historian Martin Howard (previously) writes, “I was able to pick up a rare and exquisite Waverley typewriter (1896) this summer in Scotland and have just the other day posted it to my website all cleaned and ready to show.”
The Pocket Tripod PRO had massive Kickstarter success in 2013, raising almost $85,000 in a single month. But this isn’t just another case of pre-release product hype. This ingenious little device folds out from a credit-card-shaped plastic slab into a sturdy stand with a surprisingly wide range of motion. In portrait orientation, your phone slides […]
Loot Crate is a totally different kind of subscription service that mails subscribers monthly boxes filled with curated geek, pop culture, and gamer paraphernalia. Its cult following awaits a box every month filled with everything from bobble heads to T-shirts to special edition collectibles. But nothing gets Loot Crate fans as excited as the limited […]
The ARMOR-X Mini Flexible Phone Tripod is a smartphone tripod that is designed with flexible legs to rest on virtually any type of surface. Other tripods have proved useless unless I conveniently have a flat surface in front of me, which is why this particular tripod was appealing enough to try out. The ARMOR-X is compact and easy […]