Abstract
Recent studies show that cross technology interference is critically important for emergence of innovative applications in today’s wireless networks. Existing approaches either suffer from the constraint of the need of clean preamble, or requiring technological similarities among cross technology systems.
This paper makes the first attempt for tackling this stalemate. We propose Narthil (Narthil is a sword in The Lord of the Rings and The Silmarillion. Narthil was broken in the overthrow of Sauron at the end of the Second Age and was later reforged.), an innovative coexistence system based on imperfect interference management, handling packet detection and symbol synchronization with interfered preambles. Moreover, it recovers the channel state information without the presents of clean preamble.
In Narthil, simple Butterworth bandstop filter is applied for an imperfect interference filtering. And the residual signals could be used for packet detection, symbol synchronization, and CSI estimation. The insight is, the inherent properties of preamble such as periodicity and modulation scheme, and the continuity in OFDM band could be effectively leveraged for some important operation such as signal detection, synchronization, and CSI estimation.
This inspiring design policy could be further leveraged for other cross technology signals. We implement Natrtil on our USRP/GNU radio platform, and evaluate its performance by using 15 USRP N210 devices. The experimental results demonstrates that Narthil could effectively perform the signal detection and synchronization, as well as CSI estimation without the presents of clean preamble.
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Acknowledgement
This research is partially supported by NSF China under Grants No. 61272487, 61232018, Jiangsu Distinguished Young Scholar Awards under Grant No. BK 20150030, and Project PAPD and Project CICAEET.
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Li, P. et al. (2016). Narthil: Push the Limit of Cross Technology Coexistence for Interfered Preambles. In: Sun, X., Liu, A., Chao, HC., Bertino, E. (eds) Cloud Computing and Security. ICCCS 2016. Lecture Notes in Computer Science(), vol 10040. Springer, Cham. https://doi.org/10.1007/978-3-319-48674-1_9
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DOI: https://doi.org/10.1007/978-3-319-48674-1_9
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