According to foreign media reports, the University of Washington computer scientists and electronic engineers recently developed a new type of Wi-Fi technology - passive Wi-Fi. This passive Wi-Fi device leverages the extremely feeble power to deliver traditional Wi-Fi devices at just one ten-thousandth of the power of traditional Wi-Fi devices. This passive Wi-Fi technology enables the transmission of legacy Wi-Fi devices with extremely low power consumption at a fraction of the power consumption of traditional Wi-Fi devices. Wi-Fi is a technology that wirelessly connects laptops, smartphones, printers and other terminals to each other, and has the advantage of being able to get rid of the shackles of complex and confusing cables. However, the disadvantage of Wi-Fi is also obvious. Using a Wi-Fi network consumes a lot of power, and the power consumption of various devices connected to the Wi-Fi network is very high. In the passive Wi-Fi architecture, some of the more power-hungry analog functions are given to a separate device in the network, powered by the device. Passive sensors communicate with routers, smartphones and other Wi-Fi devices with little or no electrical power. A research team of computer scientists and electronics engineers at Washington University in the United States recently developed a new type of Wi-Fi technology called Passive Wi-Fi. Researchers have experimentally demonstrated that passive Wi-Fi systems use Wi-Fi signals 1000 times less power than traditional wireless communication platforms such as Bluetooth Low Energy, Zigbee, and others. Researchers will report on the details of the research findings at the thirteenth USENIX Network Symposium on Design and Implementation in March. This research result was also named as one of the "2016 Top Ten Breakthrough Technologies" by MIT Review. Shia Gracoda, an assistant professor of computer science and engineering at the University of Washington, one of the research team leaders, said: "We wanted to know if Wi-Fi signals could be transmitted with almost no power, and that's what passive Wi-Fi -Fi development concept.We implemented Wi-Fi transmission, and the power consumption than the current best Wi-Fi equipment, power consumption 10000 times smaller. "Passive Wi-Fi for the first time Wi-Fi signal transmission Up to 11 megabits per second. Although this rate is smaller than the existing largest Wi-Fi rate, it is 11 times faster than Bluetooth transmission speed. In addition to saving battery life on a wide range of wireless end devices, passive Wi-Fi will also help with the Internet of Things because this technology allows all home devices and wearable sensors to be connected via Wi-Fi while No need to worry about the power loss. In order to achieve low-power Wi-Fi transmission, the research team must reduce the digital and analogue operations during radio transmission. Over the past two decades, the digital side of the operation has become extremely energy-efficient, while analog components still consume a significant amount of power. In the passive Wi-Fi architecture, some of the more power-hungry analog functions are given to a separate device in the network, powered by the device. A group of sensors can generate Wi-Fi data packets with very low power consumption by simply using a digitizer to simply reflect and absorb signals. In the context of the University of Washington, researchers found that their passive Wi-Fi can communicate with a smartphone for up to 100 feet (about 30 meters). Team Leader Tymos - Tala said, "In the entire network, all the heavy power-consuming components are responsible for a power-on device, and passive devices are only responsible for reflection and generate Wi-Fi data packets, which is a A true energy-efficient way to communicate. "Because the sensors generate all the real Wi-Fi packets, they can communicate with any Wi-Fi device. Research team member Brisbane - Coloog said, "Our sensors can talk to any router, smart phone, tablet or any electronic device with a Wi-Fi chip, and all of these devices can decode our reflections The resulting Wi-Fi packets, so you do not need any special equipment. " Experts believe that this technology not only can form a new type of communication, but also can make this a data-intensive world simple. For example, all smart home apps can track everything with a sensor, check to see if the door in your home has forgotten to close, and see if children have returned home from school, since the power consumption of Wi-Fi signaling Has become extremely low. According to Qiao Shuya-Smith, an associate professor of computer science and engineering at Washington University who is one of the research team leaders, "Although many families already own Wi-Fi devices, this is not the best choice, and now we only need tens of micro-watts Power can be achieved Wi-Fi transmission, and more efficient than Bluetooth, Zigbee, etc. is much higher. "