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http://dx.doi.org/10.7840/kics.2014.39C.2.199

Performance Evaluation of Underwater Code Division Multiple Access Scheme on Forward-Link through Water-Tank and Lake Experiment  

Seo, Bo-Min (경북대학교 IT대학 전자공학부 이동통신연구실)
Son, Kweon (국방과학연구소)
Cho, Ho-Shin (경북대학교 IT대학 전자공학부 이동통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.39C, no.2, 2014 , pp. 199-208 More about this Journal
Abstract
Code division multiple access (CDMA) is one of the promising medium access control (MAC) schemes for underwater acoustic sensor networks because of its robustness against frequency-selective fading and high frequency-reuse efficiency. As a way of performance evaluation, sea or lake experiment has been employed along with computer simulation.. In this study, we design the underwater CDMA forward-link transceiver and evaluate the feasibility aginst harsh underwater acoustic channel in water-tank first. Then, based on the water-tank experiment results, we improved the transceiver and showed the improvements in a lake experiment. A pseudo random noise code acquisition process is added for phase error correction before decoding the user data by means of a Walsh code in the receiver. Interleaving and convolutional channel coding scheme are also used for performance improvement. Experimental results show that the multiplexed data is recovered by means of demultiplexing at receivers with error-free in case of two users while with less than 15% bit error rate in case of three and four users.
Keywords
CDMA; Underwater acoustic sensor networks; Water-tank experiment; Lake experiment;
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