Compensation of Linear Multiscale Doppler for OFDM-Based Underwater Acoustic Communication Systems

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="139416.fig.009a" src="https://static.hindawi.com/articles/jece/volume-2012/139416/figures/139416.fig.009a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Packet 6; OFDM symbol 3</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="139416.fig.009b" src="https://static.hindawi.com/articles/jece/volume-2012/139416/figures/139416.fig.009b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Packet 6; OFDM symbol 4</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="139416.fig.009c" src="https://static.hindawi.com/articles/jece/volume-2012/139416/figures/139416.fig.009c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Packet 6; OFDM symbol 6</td></tr></table></td></tr><tr class="fig-image" id="d"><td><img alt="139416.fig.009d" src="https://static.hindawi.com/articles/jece/volume-2012/139416/figures/139416.fig.009d.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(d) </b>Packet 6; OFDM symbol 7</td></tr></table></td></tr></table>

<table>Estimated speed variation during OFDM symbol. </table>

Journal of Electrical and Computer Engineering

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Figure 9

Figure 9: Compensation of Linear Multiscale Doppler for OFDM-Based Underwater Acoustic Communication Systems 