Evaluating low power techniques for backscatter WiFi nodes

Wavelite技术建立在反向散射通信的概念之上，其中从源发射的无线WiFi信号 ** 可以被类似射频识别（RFID）的设备反射回来。这使得物联网（IoT）设备具有非常高的成本效益和广泛的部署，因为它可以从已经部署的WiFi基础设施中受益。为了进行传输，IoT节点必须首先感测WiFi激励信号的存在，然后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），它可以持续监控 ** WiFi信号的功率，并向Wavelite发射器触发唤醒信号。由于先进的物联网 ** 设备具有严格的功耗限制和寿命，WuR的功耗必须低于100 ** 微瓦。此外，WuR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。由于低功耗和低成本的压力，需要使用CMOS（互补金属氧化物半导体）技术实现更高水平的集成。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 ** 唤醒接收器，以用于其未来的物联网产品。该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 **（<100微瓦）和高灵敏度（<-80dBm），适用于WiFi反向散射物联网应用。这些目标包括研究适用于WiFi后向散射 ** 物联网设备的现有WuR架构，并对符合Wavelite ** 规范的最佳架构进行全面研究。使用CMOS技术在电路和布局层面提出并设计全新的全集成 **WuR架构，以降低功耗、成本和外形尺寸。

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.