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."
The Economist reports that a tech startup sells a surveillance and control badge for the workforce. The device monitors workers’ conversations and tracks their movements. You can even use it to make them sit straight. A technology company has created an electronic badge that can monitor workers' conversations, posture and even time spent in the […]
Digital thermometers are a great tool when slow cooking meat. It is pretty easy to under or overcook meat on the grill. Monitoring the internal temperature of your food, as you cook it, is a really good way to be sure that food is as done as you want it and no more. This affordable […]
MacRumors, which is usually correct, reports on China Economic Daily’s news of the imminent launch of Apple AirPods Pro with noise-cancelling functionality and a $260 price. The new AirPods Pro won’t look anything like the image above, although it’d be cool if they did. From MacRumors: According to China Economic Daily, Apple’s third-generation AirPods will […]
Everybody could use a little improvement, especially those of us on the hunt for new careers. Each job requires a different set of skills, and that list can change from year to year or even month to month as new technologies emerge. When you’re in that race and need to learn fast, the old model […]
In recent years, natural language processing technology and language translation technology have advanced greatly. The trouble is, language translation software typically comes in the form of apps. And while your mileage may vary on their usefulness, they share one thing in common: a serious drain on the battery for your smartphone, the very thing you’ll […]
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