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Sensors 2013, 13(11), 15385-15408; doi:10.3390/s131115385
Article

Throughput and Energy Efficiency of a Cooperative Hybrid ARQ Protocol for Underwater Acoustic Sensor Networks

1
,
2
 and
2,*
Received: 26 September 2013 / Revised: 4 November 2013 / Accepted: 4 November 2013 / Published: 8 November 2013
(This article belongs to the Section Physical Sensors)
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Abstract

Due to its efficiency, reliability and better channel and resource utilization, cooperative transmission technologies have been attractive options in underwater as well as terrestrial sensor networks. Their performance can be further improved if merged with forward error correction (FEC) techniques. In this paper, we propose and analyze a retransmission protocol named Cooperative-Hybrid Automatic Repeat reQuest (C-HARQ) for underwater acoustic sensor networks, which exploits both the reliability of cooperative ARQ (CARQ) and the efficiency of incremental redundancy-hybrid ARQ (IR-HARQ) using rate-compatible punctured convolution (RCPC) codes. Extensive Monte Carlo simulations are performed to investigate the performance of the protocol, in terms of both throughput and energy efficiency. The results clearly reveal the enhancement in performance achieved by the C-HARQ protocol, which outperforms both CARQ and conventional stop and wait ARQ (S&W ARQ). Further, using computer simulations, optimum values of various network parameters are estimated so as to extract the best performance out of the C-HARQ protocol.
Keywords: automatic repeat request; cooperative transmission; underwater acoustic sensor network; RCPC codes automatic repeat request; cooperative transmission; underwater acoustic sensor network; RCPC codes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ghosh, A.; Lee, J.-W.; Cho, H.-S. Throughput and Energy Efficiency of a Cooperative Hybrid ARQ Protocol for Underwater Acoustic Sensor Networks. Sensors 2013, 13, 15385-15408.

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