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http://dx.doi.org/10.7840/KICS.2011.36B.5.573

Underwater Channel Analysis and Transmission Method Research via Coded OFDM  

Jeon, Hyeong-Won (광주과학기술원 정보통신공학부)
Lee, Su-Je (광주과학기술원 정보통신공학부)
Lee, Heung-No (광주과학기술원 정보통신공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.36, no.5B, 2011 , pp. 573-581 More about this Journal
Abstract
The underwater channel is known to offer poor communications channel. The channel medium is highly absorptive and the transmission bandwidth is limited. In addition, the channel is highly frequency selective; the degree of selectiveness depends on a detailed geometry of the channel. Furthermore, the response changes over time as the channel conditions affecting the response such as water temperature, sea surface wind and salinity are time-varying. The transceiver design to deal with the frequency and time selective channel, therefore, becomes very challenging. It has been known that deep fading at certain specific sub-carriers are detrimental to OFDM systems. To mitigate this negative effect, the proposed coded OFDM system employs an LDPC code based modulation. In this paper, we aim 1) to provide a detailed underwater channel model; 2) to design a robust LDPC coded OFDM system; 3) to test the proposed system under a variety of channel conditions enabled by the channel model.
Keywords
Underwater Channel; Delay Spread; Doppler Spread; OFDM System; LDPC Code;
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