A5014948998- Energy Harvesting in Wireless Networks
- Full-Duplex Wireless Communications
- Antenna Design and Analysis
- Wireless Power Transfer Systems
- Bluetooth and Wireless Communication Technologies
- Wireless Body Area Networks
- RFID technology advancements
- CCD and CMOS Imaging Sensors
- Analog and Mixed-Signal Circuit Design
- Molecular Communication and Nanonetworks
- Underwater Vehicles and Communication Systems
- Advancements in Semiconductor Devices and Circuit Design
University of California, San Diego
2021-2023
National Taiwan University
2019
Many envisioned IoT applications are not realizable today due to the mW-level power burden of wireless communication circuits for most popular consumer standards: WiFi and BLE. To help enable new applications, backscatter techniques have been shown a ∼1, 000× reduction in consumption over conventional transceivers while maintaining standard compatibility [1]–[3]. However, pragmatic deployment is currently hindered by their limited range, lack IC implementations BLE [4]–[5]. For example, [3]...
Recent work in backscatter modulation has enabled very low-power communication between an loT tag and commodity hardware such as WiFi or BLE transceivers [1]–[4], enabling a new set of exciting applications on-body sensors asset trackers that demand low power deployment cost via compatibility with existing standards. However, approaches tend to require two external devices: transmitting tone generator [3], [5] access point (AP) [1], [2], [4] receiving AP [1]–[5] order perform tone-to-WiFi...
Wi-Fi is the most ubiquitous wireless networking technology for IoT in homes, offices, and businesses. Since power of transceivers (10s-to-100s mW) can be prohibitively high emerging classes devices (which desire <; 100μW), recent work has suggested piggybacking baseband signals from device directly on top incident generated by access points (APs) via Wi-Fi-compatible backscatter modulation [1-4], where as low 28μW active been demonstrated [4]. However, major limitation this approach range:...
This paper presents a backscattering chip that is powered via LTE signals, and reflects an incident reverse-whitened Bluetooth Low Energy (BLE) tone-like advertisement packet into re-radiated single-side-band (SSB) 802.11b WiFi at configurable channel location, all towards enabling RFID-like single-device interrogation system. The includes RF energy harvester, wake-up receiver, intermediate frequency (IF) ring oscillator whose calibrated with successive-approximation-register (SAR)...
This article presents an integrated circuit (IC) designed to enable low-power long-range backscatter communication with commodity Wi-Fi transceivers. The proposed chip endeavors improve the most critical and difficult specification in systems: range. It does so through two techniques: 1) a fully-reflective single-antenna solution, whereby termination of power combiner always has reflection coefficient near 1 ensure high reflected while enabling single-sideband (SSB) quadrature phase shift...
This article introduces a dual-mode backscatter integrated circuit that supports both WiFi and Bluetooth Low Energy (BLE) transmissions. It enables multi-antenna mode with reconfigurable beam steering of single-sideband (SSB) quadrature phase shift-keying (QPSK) signals, while also facilitating omnidirectional SSB BLE-to-BLE communication. To achieve steering, two techniques are proposed: 1) transmission-line-less fully-reflective SP4T switch is employed to minimize power loss maximize the...
An analog front-end (AFE) trans-impedance amplifier (TIA) for CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> detector is presented. It senses the current generated from IR detector, which contains information of concentration in air. automatic sensor baseline calibration loop proposed to cancel diode DC and amplify only desired signal. The prototype implemented 0.18-μm CMOS process. measurement performed with an off-chip resistor...
WiFi backscatter tags can enable direct connectivity of IoT devices with commodity hardware at low power. However, most state the art tag implementations in this area have limited transmitter to range, are not suitable be deployed a mesh network, and do take full advantage today's network capabilities such as MIMO. In paper, we present BeamScatter, which realize based on MIMO techniques that work very long separation 28m from an access-point enables their deployment networks. BeamScatter...
This letter presents a dual-mode multichannel transceiver implemented with low path loss offered by magnetic human body communication (mHBC) toward ultraefficient body-area networking. Two spectral-efficient modulation schemes: 1) Gaussian minimum-shift keying (GMSK) and 2) 4-level pulse-amplitude (PAM4), are used to reduce interference on adjacent channels. A power oscillator is efficiently generate both GMSK- PAM4-modulated fields while selection on-chip capacitor tuning an analog PLL,...