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On the Performance Analysis of Coherent Bandwidth in Underwater Channel Environments Using Beamforming Technologies Based on the Use of Measurement Data  

Kim, Min-Sang (호서대학교)
Cho, Dae-Young (호서대학교)
Kim, Kye-Won (호서대학교)
Lee, Tae-Seok (호서대학교)
Park, Jong-Won (한국해양과학기술원 부설 선박해양플랜트 연구소)
Lim, Yong-Gon (한국해양과학기술원 부설 선박해양플랜트 연구소)
Ko, Hak-Lim (호서대학교)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.15, no.4, 2014 , pp. 162-168 More about this Journal
Abstract
The OFDM system have been widely studied for the purpose of increasing data rate with more reliable communications in underwater channel environments. And it is possible only when the sub-carrier's bandwidth is smaller than the coherence bandwidth of channel in the underwater OFDM communication system. However, the size of the FFT for the OFDM system will be increased because the coherence bandwidth is as small as several tens of Hz in real underwater channel environments. Also, It is necessary to add a CP having a length longer than the rms delay spread of a channel. So the complexity of the system is increased and the data efficiency is reduced. Therefore, in this paper, we have studied the increase of the coherence bandwidth by adapting the beamforming technologies. To do this, we have collected data from real underwater channel environments and analyzed the coherence bandwidth when adapting the beamforming technologies. Analyzing the experimental data show that the coherence bandwidth by the beamforming technologies in underwater channel environments was greatly increased compared to that of a single sensor.
Keywords
Underwater Communication; Beamforming; Coherence Bandwidth; rms delay spread;
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