Evaluating low power techniques for backscatter WiFi nodes

Wavelite技术建立在反向散射通信概念的基础上，从信号源发出的无线WiFi信号**可以通过类似射频识别(RFID)的设备反射回来。这**使物联网(IoT)设备能够非常经济高效且可广泛部署，因为它可以受益于**已经部署的WiFi基础设施。为了进行传输，物联网节点必须首先感知**WiFi激励信号的存在，然后它唤醒调制子系统以传输数据。后向散射物联网设备的一个关键**组件是唤醒接收器(WUR)，它持续监控**WiFi信号的功率，并触发唤醒信号到Wavelite发射器。由于先进的物联网**设备具有严格的功率限制和寿命，WUR必须消耗不到100**微瓦的功率。此外，WUR还必须具有高灵敏度，以检测较弱的信号，并增加传输**范围。此外，非常紧凑的外形和低成本是Wavelite产品的重要特征。由于**低功率和低成本的压力，需要使用互补**金属氧化物-半导体(CMOS)技术的更高水平的集成。由于在CMOS技术中实现唤醒接收器**的复杂性，Wavelite需要帮助来研究和开发这种超低功耗、高灵敏度的**唤醒接收器，用于他们未来的物联网产品。**本研究项目的目标是研究和设计一种新的WUR架构，具有超低功耗**(&lt；100微瓦)和高灵敏度(&lt；-80dBm)，用于WiFi后向散射物联网应用。**这些目标包括研究现有的适用于WiFi反向散射**物联网设备的WUR架构，并对符合Wavelite**规范的最佳架构进行全面研究。提出并设计一种新的全集成**WUR架构，以降低功率、成本和外形尺寸，并在电路和版图层面使用该架构。

Wavelite technology is built upon the concept of backscatter communications, where wireless WiFi signals**emitted from a source can be reflected back by a Radio-frequency identification (RFID) like device. This**allows Internet of Things (IoT) devices to be very cost effective and widely deployable since it can benefit from**the already deployed WiFi infrastructure. To engage in a transmission the IoT node has first to sense the**presence of WiFi excitation signal and then it wakes up the modulation subsystem to transmit data. A key**component of backscattering IoT device is a wake-up receiver (WuR) that continuously monitors the power of**the WiFi signals and triggers a wakeup signal to the Wavelite transmitter.Driven by the fact that advanced IoT**devices have severe power constraints and life duration, the WuR has to consume power of less than hundred**micro-Watts. Also WuR has to have a high sensitivity to detect weaker signals, and increase the transmission**range. In addition a very compact form factor and low cost are important features in Wavelite products. Due to**the pressure of lower power and cost, a higher level of integration using CMOS (complementary**metal-oxide-semiconductor) technologies is needed. Due to the complexity of implementing wake up receiver**in CMOS technology, Wavelite needs assistance to study and develop this ultra-low power, high sensitivity**wake up receiver for their future IoT products.**The objective of this research project is to study and design of a new WuR architecture with ultra-low power**consumption (<100 micro-Watts) and high sensitivity (<-80dBm) for WiFi backscattering IoT applications.**These objectives include researching the existent available WuR architectures suitable for WiFi backscattering**IoT devices and deliver a comprehensive study on the best architecture that complies with Wavelite's**specifications. Propose and design, at circuit and layout levels using CMOS technology, a new fully integrated**WuR architecture to reduce power, cost and form factor.