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The softwater modem: a software modem for underwater acoustic communication: short paper

Published: 03 November 2009 Publication History

Abstract

The Softwater Modem is a software modem for underwater acoustic communication that enables users to run applications on the familiar sockets interface without any additional hardware except for transducers and associated amplification. A standard TCP or UDP transport protocol runs on top of IP, which via the Linux TUN driver, runs on top of custom datalink and PHY layers tailored specifically to the underwater channel. The datalink and PHY layers, written entirely in Java, use frequency-division multiple access (FDMA) with binary and 4-FSK (frequency shift keying) in any frequency band supported by the computer's sound card and can run at any bit rate supplied by the user. The transmitter sends a per-packet linear frequency modulated (LFM) chirp signal that the receiver uses for packet synchronization as well as channel estimation, with the option of applying impulse response estimates to channel equalization. Frames can contain up to 255 bytes and are encoded with Reed-Solomon (R-S) codes, for which the user can specify the number of parity bytes. The paper describes the architecture and performance of this system, which currently demonstrates two-way communication as well as realtime channel estimation.

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Cited By

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  • (2019)Tuning the demodulation frequency based on a normalized trajectory model for mobile underwater acoustic communicationsTransactions on Emerging Telecommunications Technologies10.1002/ett.371230:12Online publication date: 10-Dec-2019
  • (2018)Performance Evaluation of Adaptive Telemetry Acoustic Modem for Underwater Wireless Sensor NetworksSmart and Innovative Trends in Next Generation Computing Technologies10.1007/978-981-10-8660-1_22(291-304)Online publication date: 9-Jun-2018
  • (2015)Design and evaluation of a low-cost, DIY-inspired, underwater platform to promote experimental research in UWSNAd Hoc Networks10.1016/j.adhoc.2014.10.00734:C(239-251)Online publication date: 1-Nov-2015
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  1. The softwater modem: a software modem for underwater acoustic communication: short paper

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          cover image ACM Conferences
          WUWNet '09: Proceedings of the 4th International Workshop on Underwater Networks
          November 2009
          99 pages
          ISBN:9781605588216
          DOI:10.1145/1654130
          Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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          Published: 03 November 2009

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          Author Tags

          1. DSP
          2. SDR
          3. inverse filter
          4. noncoherent FSK
          5. underwater acoustic modem

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          View all
          • (2019)Tuning the demodulation frequency based on a normalized trajectory model for mobile underwater acoustic communicationsTransactions on Emerging Telecommunications Technologies10.1002/ett.371230:12Online publication date: 10-Dec-2019
          • (2018)Performance Evaluation of Adaptive Telemetry Acoustic Modem for Underwater Wireless Sensor NetworksSmart and Innovative Trends in Next Generation Computing Technologies10.1007/978-981-10-8660-1_22(291-304)Online publication date: 9-Jun-2018
          • (2015)Design and evaluation of a low-cost, DIY-inspired, underwater platform to promote experimental research in UWSNAd Hoc Networks10.1016/j.adhoc.2014.10.00734:C(239-251)Online publication date: 1-Nov-2015
          • (2013)Development of underwater acoustic communication model: Opportunities and challenges2013 International Conference of Information and Communication Technology (ICoICT)10.1109/ICoICT.2013.6574601(358-362)Online publication date: Mar-2013
          • (2012)A low-cost and flexible underwater platform to promote experiments in UWSN researchProceedings of the 7th International Conference on Underwater Networks & Systems10.1145/2398936.2398941(1-8)Online publication date: 5-Nov-2012
          • (2012)Designing an Adaptive Acoustic Modem for Underwater Sensor NetworksIEEE Embedded Systems Letters10.1109/LES.2011.21800134:1(1-4)Online publication date: 1-Mar-2012
          • (2010)Measurement-based underwater acoustic physical layer simulationOCEANS 2010 MTS/IEEE SEATTLE10.1109/OCEANS.2010.5664378(1-8)Online publication date: Sep-2010

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