US 11,843,494 B2
Orthogonal frequency-division multiple access-based backscatter system
Fengyuan Zhu, Shanghai (CN); Yuda Feng, Shanghai (CN); Qianru Li, Shanghai (CN); Xiaohua Tian, Shanghai (CN); and Xinbing Wang, Shanghai (CN)
Assigned to SHANGHAI JIAO TONG UNIVERSITY, Shanghai (CN)
Appl. No. 17/796,639
Filed by SHANGHAI JIAO TONG UNIVERSITY, Shanghai (CN)
PCT Filed Jun. 23, 2021, PCT No. PCT/CN2021/101725
§ 371(c)(1), (2) Date Jul. 29, 2022,
PCT Pub. No. WO2021/223777, PCT Pub. Date Nov. 11, 2021.
Claims priority of application No. 202010383618.6 (CN), filed on May 8, 2020.
Prior Publication US 2023/0103804 A1, Apr. 6, 2023
Int. Cl. H04L 27/26 (2006.01)
CPC H04L 27/2626 (2013.01) 10 Claims
OG exemplary drawing
 
1. An orthogonal frequency-division multiple access (OFDMA)-based backscatter system, comprising:
an analog portion and a digital logic portion; wherein,
the analog portion comprises: an antenna, radio frequency (RF) switches, an envelope detection circuit, and a transmission line;
the digital logic portion comprises: an inverse discrete Fourier Transform (IDFT)-based digital frequency synthesis module; and
two outputs of the digital logic portion control all the RF switches, and the envelope detection circuit provides an input of the digital logic portion.