Performance Comparison of Doppler Scale Estimation Methods for Underwater Acoustic OFDM

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="703243.fig.0013a" src="https://static.hindawi.com/articles/jece/volume-2012/703243/figures/703243.fig.0013a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Successful case</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="703243.fig.0013b" src="https://static.hindawi.com/articles/jece/volume-2012/703243/figures/703243.fig.0013b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Failed case</td></tr></table></td></tr></table>

<table>Illustration of the objective functions of the null-subcarrier-based method in a two-user system</table>

Journal of Electrical and Computer Engineering

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Figure 13

Figure 13: Performance Comparison of Doppler Scale Estimation Methods for Underwater Acoustic OFDM 