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http://dx.doi.org/10.7840/kics.2014.39C.6.457

Underwater Experiment on CSMA/CA Protocol Using Commercial Modems  

Cho, Junho (School of Electronics Engineering, Kyungpook National University)
Lee, Sang-Kug (Agency for Defense Development)
Shin, Jungchae (Hanwha Corporation)
Lee, Tae-Jin (Hanwha Corporation)
Cho, Ho-Shin (School of Electronics Engineering, Kyungpook National University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.39C, no.6, 2014 , pp. 457-465 More about this Journal
Abstract
This paper introduces a test bed for communication protocol schemes of underwater acoustic sensor network, and also shows experimental results obtained from the test bed. As a testing protocol, carrier sense multiple access/collision avoidance (CSMA/CA) is evaluated on underwater acoustic channel. A sensor node is equipped with a DSP control board of ATmega2560 and a commercial underwater modem produced by Benthos. The control board not only manipulates a GPS signal to acquire the information of location and time, but also controls the underwater modem to operate according to the procedure designed for a given testing protocol. Whenever any event takes place such as exchanging control/data packets between underwater modems and acquiring location and timing information, each sensor node reports them through radio frequency (RF) air interface to a central station located on the ground. The four kinds of packets for CSMA/CA, RTS(Request To Send), CTS(Clear to Send), DATA, ACK(Acknowledgement) are designed according to the underwater communication environment and are analyzed through the lake experiment from the point of feasibility of CSMA/CA in underwater acoustic communications.
Keywords
underwater communication; underwater sensor network; MAC protocol;
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