A Parallel Decoding Approach for Mitigating Near-Far Interference in Internet of Underwater Things

Yuehai Zhou, Roee Diamant

Research output: Contribution to journalArticlepeer-review

Abstract

With the massive development of underwater small robotic vehicles and matching acoustic modems, applications for the Internet of Underwater Things (IoUT) are emerging. IoUT involves communication between the nonsynchronized network nodes organized in a mesh. A limiting factor of such communication is the so-called near-far effect, where transmissions from a node (near) close to a common receiver block the transmissions of a farther node (far). Due to the high-power attenuation in the underwater acoustic channel, near-far effect is common in underwater acoustic communication networks, and the phenomena occurs even for a distance ratio of 80% between the near and far nodes to the receiver, and the large number of nodes in the IoUT compounds the effect of this phenomena. While the current approaches only consider the jamming effect to the far signal, in this article, we consider canceling the interference from both sources by estimating and equalizing the channels on parallel, thereby significantly improving the decoding of both signals. As a result, IoUT performance improves. To limit mutual interference, we propose an automatic switching mechanism that controls the cancelation operation both in channel estimation and channel equalization. The simulation results show that our approach obtains significant improvement in communication from both near and far nodes. Results from a designated sea trial demonstrate that when both nodes are affected by their mutual transmissions, our proposed method improves the output signal-to-noise ratio (SNR) significantly.

Original languageEnglish
Article number9069249
Pages (from-to)9747-9759
Number of pages13
JournalIEEE Internet of Things Journal
Volume7
Issue number10
DOIs
StatePublished - Oct 2020

Bibliographical note

Funding Information:
Manuscript received November 26, 2019; revised February 28, 2020; accepted April 12, 2020. Date of publication April 16, 2020; date of current version October 9, 2020. This work was supported in part by the European Union’s Horizon 2020 Research and Innovation Programme under Grant 773753 (SYMBIOSIS), in part by the Center for Cyber Law and Policy at the University of Haifa in conjunction with the Israel National Cyber Directorate in the Prime Minister’s Office, and in part by the Israeli Ministry is Science under Grant 3-16728. This article was presented in part at the International Conference and Exhibition on Underwater Acoustics, Greece, 2019. (Corresponding author: Roee Diamant.) The authors are with the Hatter Department of Marine Technologies, University of Haifa, Haifa 3498838, Israel (e-mail: ruddy100@sina.com; roee.d@univ.haifa.ac.il). Digital Object Identifier 10.1109/JIOT.2020.2988246

Publisher Copyright:
© 2014 IEEE.

Keywords

  • Channel estimation and channel equalization
  • Internet of Underwater Things (IoUT)
  • compressed sensing
  • diversity techniques
  • interference cancelation (IC)
  • multiuser detection
  • near-far interference
  • signal separation and interference rejection
  • underwater acoustic communications

ASJC Scopus subject areas

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications

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