Paper Info
Title
12.2 Improving the Range of WiFi Backscatter Via a Passive Retro-Reflective Single-Side-Band-Modulating MIMO Array and Non-Absorbing Termination
Abstract
Wi-Fi is the most ubiquitous wireless networking technology for IoT in homes, offices, and businesses. Since the power of Wi-Fi transceivers (10s-to-100s of mW) can be prohibitively high for emerging classes of IoT devices (which desire <; 100μW), recent work has suggested piggybacking baseband signals from the IoT device directly on top of incident Wi-Fi signals generated by access points (APs) via Wi-Fi-compatible backscatter modulation [1-4], where as low as 28μW of active power has been demonstrated [4]. However, the major limitation of this approach is range: signals generated by the transmitting AP experience 1/d <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> path loss to the backscattering tag, which has insertion loss P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L,ins</sub> to perform single-side band (SSB) modulation, and then re-radiated modulated signals back to the receiving AP (or to another AP) experience an additional 1/d2 path loss, resulting in an overall loss ∝ 1/d4 + P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L,ins</sub> . With no active RF amplification, the tag in [4] experienced P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L,ins</sub> =15dB, limiting AP-to-tag-and-back-to-AP distance to ~10m, which is not sufficient in many single-AP homes.
Year
DOI
Venue
2021
10.1109/ISSCC42613.2021.9366014
2021 IEEE International Solid- State Circuits Conference (ISSCC)
Keywords
DocType
Volume
backscattering tag,single-side band modulation,modulated signals,single-AP homes,passive retro-reflective single-side-band-modulating MIMO array,nonabsorbing termination,ubiquitous wireless networking technology,Wi-Fi transceivers,IoT device,incident signals,Wi-Fi-compatible backscatter modulation,active power,path loss,AP experience,piggybacking baseband signals
Conference
64
ISSN
ISBN
Citations 
0193-6530
978-1-7281-9550-6
0
PageRank 
References 
Authors
0.34
0
7
Name
Order
Citations
PageRank
miao meng143.16
Manideep Dunna251.44
Hans Yu361.48
Shihkai Kuo400.68
Po-Han Peter Wang5115.10
Dinesh Bharadia682247.06
patrick p mercier7338.11