Abstract
Backscatter communication is the core technology supporting the passive internet of things (IoT). Existing space-time stream backscatter systems are non-universal and inefficient due to aspects like tag-data modulation being heavily related to the ambient excitation’s stream number, low throughput with multi-stream excitation, and the need for the original signal for tag-data demodulation.We introduce STScatter, a universal space-time stream backscatter. STScatter includes the following unique features that set it apart from other systems: For starters, STScatter’s tag-data modulation is universal for excitation with any number of space-time streams. Furthermore, STScatter achieves efficient tag-data modulation at the symbol-level, allowing space-time stream backscatter to reach high tag-data throughput. Additionally, unlike previous systems that decoded tag data from both the original ambient and backscattered signal, STScatter can decode ambient data and backscatter data simultaneously from the backscattered signal.STScatter is prototyped using commercial FPGAs and SDRs. Our extensive experiments show that the STScatter is universal with different space-time streams excitation, including WiFi 4/5. STScatter can achieve a throughput of up to 499.95 kbps in single-stream excitation and 499.94 kbps in multi-stream excitation, which is 4.10x and 171.10x better than MOXcatter.
Authors
Yifan Yang, Wei Gong.
Publication:
IEEE PerCom 2022 (CCF-B) [Link] [PDF] [Video]
Keywords
Internet of Things, backscatter, WiFi
