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A novel offline indoor acoustic synchronization protocol: experimental analysis

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Smart electronic devices are playing a fundamental role in modern home and industrial applications. The increased reliance on such devices, especially in time critical and secure applications, intensifies the need for time synchronization among multiple devices. This work presents a novel audio-based, cheap, offline synchronization method, whereby multiple slaves synchronize simultaneously to a master within a single room. Synchronization is carried out under the proposed protocol in a way that is independent of the physical location of the target devices, which in turn are not required to have any sort of network connectivity. The proposed method relies on the transmission of a De Bruijn sequence that holds the information required for the slaves to synchronize. The effectiveness of the proposed synchronization protocol is validated through an in-house experimental setup. Synchronization at distances of up to 250 cm between the master and a slave was achieved.

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  1. Kim JY, Lee HY, Son JY and Park JH (2015) “Smart home web of objects-based IoT management model and methods for home data mining,” in 17th Asia-Pasific Network Operations and Management Sumposium (APSNOMS)

  2. Li F, Yang Y, Chi Z, Zhao L, Yang Y, Luo J (2018) “Trinity: Enabling self-sustaining WSNs indoors with energy-free sensing and networking.” ACM Trans Embedded Comput Syst 17(2):Article 57

    Google Scholar 

  3. Guo H, Crossly P (2017) Design of a time synchronization system based on GPS and IEEE 1588 for trasnmission substations. IEEE Trans Power Delivery 32(4):2091–2100

    Article  Google Scholar 

  4. IEEE Guide for Designing a Time Synchronization System for Power Substations, IEEE Std 2030.101TM-2018

  5. IEEE Standard Profile for Use of IEEE 1588TM Precision Time Protocol in Power System Applications, IEEE Std C37.238TM-2011

  6. Amelot J and Stenbakken G (2012) “Testing phasor measurement units using ieee 1488 precision time protocol,” in Conference on Precision Electromagnetic Measurements (CPEM) 2012

  7. Mills D (1991) Internet time synchronization: the network time protocol. IEEE Trans Commun 39(10):1482–1493

    Article  Google Scholar 

  8. Helling D, Hense M, Van der Auweraer H and Leuridan J (2005) “Data stream synchronization of distributed measurements systems using GPS technology,” in IEEE Intelligent Data Acquisition and Advanced Computer Systems: Technology and Applications IDAACS 2005

  9. Refan MH and Valizadeh H (2011) “Redundant GPS time synchronization boards for computer networks,” in 19th Telecommunications Forum (TELFOR) Proceedings of Papers 2011

  10. Yan L (2012) “Application of GPS technology in frame-signal synchronization system of wireless broadband access,” in 2nd International Conference on Consumer Electronics, Communications and Networks (CECNet) 2012

  11. Li L, Xing G, Sun L, Huangfu W, Zhou R and Zhu H (2011) “Exploiting FM radio data system for adaptive clock calibration in sensor networks,” in Proceedings of the 9th International Conference on Mobile Systems, Applications, and Services

  12. IEEE Std802.15.4TM-2015, IEEE Standart for Low-Rate Wireless Personal Area Networks (WPANs)

  13. Guo X, Mohammad M, Saha S, Chan CM, Gilbert S and Leong D (2016) “PSync: visible light-based time synchronization for Internet of Things (IoT),” in IEEE INFOCOM The 35st Annual IEEE International Conference on Computer Communications

  14. Yang Q, An D and Yu W (2013) “On time desynchronization attack against ieee 1558 protocol in power grid systems,” in IEEE Energytech 2013

  15. Shijith N, Poornachandran P, Sujadevi VG and Dharmana MM (2017) “Spoofing technique to counterfeit the gps receiver on a drone,” in International Conference on Technological Advancements in Power and Energy

  16. Bonebrake C, O’Neil LR (2014) Attacks on GPS time reliability. IEEE Secur Priv 12(3):82–84

    Article  Google Scholar 

  17. Psiaki ML, Humphreys TE (2016) GNSS spoofing and detection. Proc IEEE 104(6):1258–1270

    Article  Google Scholar 

  18. Humphreys TE, Ledvina BM, Psiaki ML, O’Hanlon BW and Kintner Jr PM (2008) “Assessing the spoofing threat: development of a portable GPS civilian spoofer,” in 21st International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2008)

  19. Aoki N, Ikeda K and Yasuda H (2020) “A synchronization technique using De Bruijn sequences for inaudible sound communication systems,” in International Conference on Emerging Technologies for Communications (ICETC 2020), online, December 2–3

  20. “Send data using sound,” Chirp, [Online]. Available:

  21. Nguyen Q, Choi J (2016) Matching pursuit based robust acoustic event classification for surveillance systems. Comput Electr Eng 57:43–54

    Article  Google Scholar 

  22. Qiao G, Bilal M, Liu S, Babar Z, Ma T (2018) Biologically inspired covert underwater acoustic communication - a review. Physical Communication 30:107–114

    Article  Google Scholar 

  23. Azad S, KhandakerTabin H, Nandi D, Pathan A-SK (2015) A high-throughput routing metric for multi-hop underwater acoustic networks. Comput Electrical Eng 44:24–33

    Article  Google Scholar 

  24. Morns IP, Hinton OR, Adams AE and Sharif BS (2001) “Protocol for sub-sea communication networks,” in Proceedings of MTS/IEEE Oceans Conference 2001. An Ocean Odyssey

  25. Hong F, Yang B, Zhang Y, Xu M, Feng Y and Guo Z (2014) “Time synchronization for underwater sensor networks based on multi-source beacon fusion,” in 20th IEEE International Conference on Parallel and Distributed Systems (ICPADS)

  26. De Bruijn N (1946) A combinatorial problem. Proceedings of Nederlandse Akademie van Wetenschappen 49:758–764

    MATH  Google Scholar 

  27. Mitchell CJ, Etzion T, Paterson KG (1996) A method for constructing decodable de Bruijn sequences. IEEE Trans Inform Theory 42(5):1472–1478

    Article  MathSciNet  Google Scholar 

  28. Margossian H, Sayed MA, Fawaz W, Nakad Z (2019) Partial grid false data injection attacks against state estimation. Int J Electr Power Energy Syst 110:623–629

    Article  Google Scholar 

  29. Spinsante S, Andrenacci S and Gambi E (2011) “Binary De Bruijn sequences for DS-CDMA systems: analysis and results”. EURASIP J Wireless Commun Netw 4

  30. Sacchi C (2019) “About the use of a new set of quadriphase sequences for increasing security of PMR over LTE primary synchronization,” in IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), Sochi

  31. Chee YM, Etzion T, Kiah HM, Khu Vu V and Yaakobi E (2019) “Constrained de Bruijn codes and their applications,” in IEEE International Symposium on Information Theory (ISIT), Paris

  32. Howie RM, Paxman J, Bland PA, Towner MC, Sansom EK, Devillepoix HAR (2017) Submillisecond fireball timing using de Bruijn timecodes. Meteorit Planet Sci 52(8):1669–1682

    Article  Google Scholar 

  33. Forster R (2000) “Manchester encoding: opposing definitions resolved”. Eng Sci Educ J 278–280

  34. Jose J (2013) “Design of Manchester II bi-phase encoder for MIL-STD-1553 protocol,” in International Multi-Conference on Automation, Computing, Communication, Control and Compressed Sensing (iMacs4) 2013

  35. “Manchester Encoding Basics,” [Online]. Available: Accessed 17 Aug 2021

  36. Tao Q, Zhong C, Lin H and Zhang Z (2018) “Symbol detection of ambient backscatter systems with manchester coding”. IEEE Trans Wireless Commun 17(6)

  37. Capel V (2016) Newness audio and Hi-Fi, engineer's pocket book. Elsevier

  38. Guri M, Solewicz Y and Elovici Y (2018) “MOSQUITO: covert ultrasonic transmission between two air-gapped computers using speaker-to-speaker communication,” in Proceedings of the 2018 IEEE Conference on Dependable and Secure Computing (DSC), Kaohsiung, Taiwan (ROC)

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The authors acknowledge the efforts of Aymane El Baarini, Christelle Saliba, Rayan Al Sobbahi in conducting portions of the lab experiments.


This project has been jointly funded with the support of the National Council for Scientific Research in Lebanon CNRS-L and the Lebanese American University.

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Correspondence to Wissam Fawaz.

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Nakad, Z., Sayed, M.A., Yaghi, A. et al. A novel offline indoor acoustic synchronization protocol: experimental analysis. Ann. Telecommun. 77, 221–236 (2022).

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