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Ultrasound Communication Through Thin Plates: Understanding and Estimating the Channel
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0002-6216-6132
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0001-8647-436X
2022 (Engelska)Ingår i: 2022 IEEE International Ultrasonics Symposium (IUS), IEEE, 2022Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

As with all digital communications, understanding the propagation channel is essential. In this paper we present an analytical model of a channel consisting of a thin plate, including effects of frequency-dependent speed of sound and attenuation. We show how a compressed sensing approach can be used to estimate this channel impulse response from real measurements, even for cases when the plate thickness causes the reverberating pulses to overlap. The estimate can be seen as a sparsity constrained deconvolution of the combined impulse responses of the transmitting and receiving transducers. We then show with simulations that the proposed sparsity-constrained estimate is able to cope also in the presence of dispersion. We also analyze the performance of the proposed method both with simulations and experiments on 6 mm and 2 mm thick glass plate and 3 mm thick aluminum plate, and our results show that the model assumptions seems to hold.

Ort, förlag, år, upplaga, sidor
IEEE, 2022.
Serie
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
Nyckelord [en]
Ultrasound communication, OFDM, Channel estimation, Compressed sensing
Nationell ämneskategori
Signalbehandling Telekommunikation
Forskningsämne
Signalbehandling
Identifikatorer
URN: urn:nbn:se:ltu:diva-94160DOI: 10.1109/IUS54386.2022.9957370ISI: 000896080400076Scopus ID: 2-s2.0-85143811180ISBN: 978-1-6654-6657-8 (digital)OAI: oai:DiVA.org:ltu-94160DiVA, id: diva2:1712067
Konferens
2022 IEEE International Ultrasonics Symposium (IUS), Venice, Italy, 10-13 October, 2022
Forskningsfinansiär
Vetenskapsrådet, 2019-05376Tillgänglig från: 2022-11-20 Skapad: 2022-11-20 Senast uppdaterad: 2023-09-04Bibliografiskt granskad
Ingår i avhandling
1. Ultrasound Communication through Thin Plates: Understanding the Channel
Öppna denna publikation i ny flik eller fönster >>Ultrasound Communication through Thin Plates: Understanding the Channel
2023 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Ultrasound, composed of sound waves with frequencies above the human audible range, has become widely used in various technological fields for digital communications. In the past, acoustic and ultrasonic waves were employed in military and commercial un-derwater wireless communication systems due to their superior performance compared to electromagnetic waves. Ultrasound has also emerged as a viable alternative to radio and wired transmission for data transmission through solid bodies like metal plates and pipe walls. Notably, ultrasound offers high-security features as it is nearly undetectable from outside the room, minimizing the risks of wireless interception and attacks like Bluesniping and jamming.

In any digital communication system, understanding the propagation channel between the transmitter and receiver is crucial. The ultrasound communication channel comprises three main components: transmitting and receiving transducers and the medium through which the sound propagates. Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier scheme that divides the available spectrum into multiple non-overlapping subcarriers for digital communication.

In the context of ultrasound communication, the channel consists of two parts: the combined response of the transducers used as the transmitter and receiver, and the im-pulse response of the propagation medium. When dealing with a thin plate with parallel surfaces, this results in a reverberating channel. The reverberating channel comprises a primary pulse along with echo pulses that possess similar shapes but decaying amplitudes. The amplitude decay occurs due to four prominent factors: power losses in the trans-ducers at each side, transmission losses at the boundaries of the plate and transducer, ultrasound pulse attenuation within the plate, and beam spreading as the ultrasound pulse travels over distance. The reverberations elongate the impulse response of the channel, thus require a long cyclic prefix to prevent data symbols to overlap. However, this limitation restricts the achievable bit rate and energy efficiency of the system.

In this thesis, we present a model for the reverberating ultrasound channel suitable for various plate materials. We propose a novel system-level path loss model that accounts for losses at the transducers, transmission losses, material attenuation, and diffraction losses. Based on this model, we calculate a comprehensive link budget that explicitly considers plate thickness. Furthermore, we conduct a quantitative analysis to evaluate the impact of Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) on the performance of the OFDM system. Through computer simulations, we evaluate the system’s performance and demonstrate that for a metal plate with a thickness of 5 mm, an uncoded data rate of 32 Mbps can be achieved.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2023
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Nationell ämneskategori
Övrig annan teknik
Forskningsämne
Signalbehandling
Identifikatorer
urn:nbn:se:ltu:diva-96647 (URN)978-91-8048-315-5 (ISBN)978-91-8048-316-2 (ISBN)
Presentation
2023-06-15, E632, Luleå tekniska universitet, Luleå, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2023-04-18 Skapad: 2023-04-18 Senast uppdaterad: 2024-01-01Bibliografiskt granskad

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Ashraf, AsraCarlson, Johan E.van de Beek, Jaap

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