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."
Logitech’s MX Keys [Amazon] is what it finally took to lure me away from mechanical keyboards. It’s a slim yet solidly-constructed full-size model that’s similar to and superior to Apple’s Magic Keyboard. It’s flat, minimalist, heavy, solid and low-profile, with large backlit keys typeset in something similar to Futura Light. The keys are square with […]
Microsoft is to shut shop on the high streets and malls of America, permanently closing its 116 retail stores. Only 10 were overseas; flagship stores in New York City, London, Sydney, and Redmond will be remain as showrooms that do not sell the products. There will be no layoffs, Microsoft reports. Alarm bells rang when […]
Traintrackr is a powered circuit board showing a map of the London Underground, lighting up in real time to show train positions on 333 stations on all 12 main lines. It connects to the tube’s API for live location data every second. The board is 400mm x 300mm and sells for £249. (There’s also the […]
With all due respect to our vegetarian friends, there might be nothing more intrinsically linked to the 4th of July holiday than a big ole cookout. Sure, fireworks and celebrating the birth of a constitutional republic are great too, but showing off your cooking prowess with a brilliantly seared, mouth-watering slab of grade-A American beef […]
We’re at the midway point of 2020. So…how’s the year going for you so far? Yeah…we can guess. But while there’s a lot about 2020 we can’t directly control, maybe a little retail therapy can help make you feel better. Sure, the 39 items we gathered together can absolutely bring a smile to your face. […]
When revved-up kids used to dribble a basketball through the kitchen or practice their footwork with a soccer ball in front of the television, exasperated parents would often just send ‘em outside to play. But these days, sending kids out might not be the best course of action. Despite all the changes, many budding young […]