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According to foreign media reports, computer scientists and electronics engineers at the University of Washington recently developed a new Wi-Fi technology - passive Wi-Fi. This passive Wi-Fi device can transmit the traditional Wi-Fi device with extremely weak power, and consumes only one ten-thousandth of the power consumption of traditional Wi-Fi devices.
This passive Wi-Fi technology can realize the transmission function of traditional Wi-Fi devices with extremely weak power, and consumes only one ten-thousandth of the power consumption of traditional Wi-Fi devices.
Wi-Fi is a technology that can connect terminals such as laptops, smartphones, and printers to each other wirelessly. The advantage is that users can get rid of the complicated and chaotic cable. However, the disadvantages of Wi-Fi are also obvious. Using a Wi-Fi network consumes a lot of power, and the various devices connected to the Wi-Fi network consume very much power.
In the passive Wi-Fi architecture, some of the power-hungry analog functions are given to a separate device in the network that is powered up. Passive sensors communicate with routers, smartphones, and other Wi-Fi devices with virtually no power.
A research team of computer scientists and electronics engineers at the University of Washington recently developed a new Wi-Fi technology called Passive Wi-Fi. Researchers have shown that passive Wi-Fi systems use Wi-Fi signals to consume 1000 times less power than traditional wireless communication platforms (such as low-power Bluetooth, Zigbee, etc.). Researchers will report on the details of the research at the 13th USENIX Network System Design and Implementation Symposium in March. This research result was also named one of the “Top Ten Breakthrough Technologies in 2016†by MIT Science and Technology Review.
“I want to know if Wi-Fi signal transmission can be achieved with almost no power,†said Hiam Grakota, an assistant professor of computer science and engineering at the University of Washington. “This is passive Wi-Fi. -Fi development concept. We have realized Wi-Fi transmission, and the power consumption is 10,000 times smaller than the best existing Wi-Fi equipment." Passive Wi-Fi first realizes Wi-Fi signal transmission The rate is up to 11 megabits per second. Although this rate is smaller than the current maximum Wi-Fi rate, it is 11 times faster than Bluetooth transmission.
In addition to saving the battery life of various wireless terminal devices, passive Wi-Fi will also help the realization of the Internet of Things, because this technology allows all home devices and wearable sensors to be connected via Wi-Fi. No need to worry about the loss of electricity. In order to achieve low-power Wi-Fi transmission, the research team must reduce the digital and analog operations in the radio transmission process. In the past 20 years, the digital side of computing has become extremely energy efficient, while analog components still consume a lot of power. In the passive Wi-Fi architecture, some of the power-hungry analog functions are given to a separate device in the network that is powered up. A set of sensors simply uses a digitizer to simply reflect and absorb the signal, enabling Wi-Fi packets to be generated with very low power consumption. In the real world of the University of Washington, researchers found that their passive Wi-Fi and a smartphone can communicate up to 100 feet (about 30 meters).
Research team member Wams-Tara said, "In the entire network, all heavy-duty power-consuming components are handled by a power-receiving device, and passive devices are only responsible for reflecting and generating Wi-Fi data packets. This is a A true way to communicate energy-efficiently. Because sensors produce true Wi-Fi packets, they can communicate with any Wi-Fi device. Research team member Bryce Kologg said, "Our sensors can talk to any router, smartphone, tablet or any electronic device with a Wi-Fi chip, and all of these devices can decode us through reflection. The resulting Wi-Fi packets, so you don't need any special equipment."
Experts believe that this technology can not only form a new type of communication, but also make this data-intensive world simple. For example, all smart home applications can track anything through sensors, from seeing if the door at home is forgotten to close, to seeing if the child has returned home from school, it will be extremely easy because of the energy consumption of Wi-Fi signaling. Has become extremely low. Qiao Shuya-Smith, an associate professor of computer science and engineering at the University of Washington, one of the research team leaders, said, "Although many families already have Wi-Fi devices, this is not the best option. Now we only need tens of microwatts. The power can be used for Wi-Fi transmission, and it is much more efficient than low-energy Bluetooth and Zigbee."
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