FLEW: fully emulated wifi
FLEW: fully emulated wifi
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DOI：
10.1145/3495243.3517030
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Hsun-Wei Cho;K. Shin
中科院分区：
文献类型：
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作者：
Hsun-Wei Cho;K. Shin
WiFi是使用2.4GHz ISM频段提供无线上网的事实上的标准。全球已经出货了数百亿台WiFi设备，WiFi接入点（ap）在公共、企业和个人环境中无处不在。我们也见证了IoT（物联网）设备的快速增长。随着更严格的电路板空间和电源要求，许多物联网设备使用更节能，更低成本和更小的无线芯片，如蓝牙或专有无线芯片。由于不同无线技术的不匹配，这些设备通过远不那么普遍的物联网网关间接访问互联网。蓝牙和大多数专有无线芯片都是基于FSK（频移键控）调制，因为FSK可以通过极其简单和低功耗的FM（调频）电路实现。在本文中，我们提出了fly (Fully emululated WiFi)，它使用单个FSK芯片来完全模拟WiFi信号的发送和接收。使用FLEW，配备fsk的物联网或移动/可穿戴设备可以直接与未经修改的WiFi ap通信，就像任何WiFi设备一样。FLEW结合了这两种技术的优点：极其简单和低功耗的硬件和无处不在的互联网接入。我们对所有主要芯片制造商的芯片进行了广泛的评估。在20米的传输层，fly可以维持708kbps的上行和857kbps的下行。
WiFi is the de facto standard for providing wireless access to the Internet using the 2.4GHz ISM band. Tens of billions of WiFi devices were shipped worldwide and WiFi Access Points (APs) are ubiquitous in public, enterprise and personal environments. We have also witnessed the fast growth of IoT (Internet of Things) devices. With more stringent board-space and power requirements, many IoT devices use more power-efficient, lower-cost and smaller wireless chips, such as Bluetooth or proprietary wireless chips. Due to the mismatch of different wireless technologies, these devices access the Internet indirectly via far less ubiquitous IoT gateways. Bluetooth and most proprietary wireless chips are based on FSK (Frequency-Shift Keying) modulation since FSK can be implemented with extremely simple and low-power FM (Frequency Modulation) circuits. In this paper, we present FLEW (Fully Emulated WiFi), which uses a single FSK chip to fully emulate both transmission and reception of WiFi signals. Using FLEW, FSK-equipped IoT or mobile/wearable devices can directly communicate with unmodified WiFi APs, just like any WiFi device. FLEW combines the best of both technologies: extremely simple and low-power hardware and ubiquitous Internet access. We evaluate FLEW extensively with chips from all major chip makers. At 20 meters, FLEW can sustain 708kbps uplink and 857kbps downlink at the transport layer.