Orthcatter: High-throughput In-band OFDM Backscatter with Over-the-Air Code Division

Caihui Du, Jihong Yu*, Rongrong Zhang, Ju Ren, Jianping An

*此作品的通讯作者

科研成果: 书/报告/会议事项章节会议稿件同行评审

7 引用 (Scopus)

摘要

The existing ambient backscatter systems suffer from either more spectrum utilization or low throughput. we propose Orthcatter, the first in-band OFDM backscatter system that provides a higher throughput while consuming fewer spectrum resources. Our key innovation is the designed over-the-air code division technique that enables the cancellation of the co-channel interferences, solving the core challenge of the in-band backscatter communication. Unlike the common code-division systems that generate orthogonal codewords locally, we construct the quasi-orthogonal backscatter codewords by swapping the subcarriers of each excitation OFDM symbol and concrete this design passively with a double side-band symbol construction method. Armed with these quasi-orthogonal codewords, we design a two-step interference cancellation scheme, significantly improving reliability. We prototype and test Orthcatter. The results show that Orthcatter can achieve throughput of 248kbps and a BER of 10-4 under OFDM WiFi exciter, improving by over 4.6× and 300× compared with the state-of-the-art in-band backscatter system. Our throughput and BER can even be 11kbps higher and 59× better than the prior side-band backscatter systems, and the exciter-to-tag communication range is 3× of prior OFDM backscatter systems.

源语言英语
主期刊名Proceedings of the 21st USENIX Symposium on Networked Systems Design and Implementation, NSDI 2024
出版商USENIX Association
1301-1314
页数14
ISBN(电子版)9781939133397
出版状态已出版 - 2024
活动21st USENIX Symposium on Networked Systems Design and Implementation, NSDI 2024 - Santa Clara, 美国
期限: 16 4月 202418 4月 2024

出版系列

姓名Proceedings of the 21st USENIX Symposium on Networked Systems Design and Implementation, NSDI 2024

会议

会议21st USENIX Symposium on Networked Systems Design and Implementation, NSDI 2024
国家/地区美国
Santa Clara
时期16/04/2418/04/24

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引用此

Du, C., Yu, J., Zhang, R., Ren, J., & An, J. (2024). Orthcatter: High-throughput In-band OFDM Backscatter with Over-the-Air Code Division. 在 Proceedings of the 21st USENIX Symposium on Networked Systems Design and Implementation, NSDI 2024 (页码 1301-1314). (Proceedings of the 21st USENIX Symposium on Networked Systems Design and Implementation, NSDI 2024). USENIX Association.