A Novel Subcarrier-Level Spectrum Sensing Method by Utilizing Fine-Grained Channel State Information in Wireless Networks

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/wcmc/volume-2021/6639894/figures/6639894.fig.006a.svgz" name="6639894.fig.006a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Subcarrier 1</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/wcmc/volume-2021/6639894/figures/6639894.fig.006b.svgz" name="6639894.fig.006b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Subcarrier 6</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/wcmc/volume-2021/6639894/figures/6639894.fig.006c.svgz" name="6639894.fig.006c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Subcarrier 19</td></tr></table>

<div>The initial state variations belong to different subcarriers: (a) the variations of subcarrier 1; (b) the variations of subcarrier 6; (c) the variations of subcarrier 19.</div>

Wireless Communications and Mobile Computing

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Figure 6

Figure 6: A Novel Subcarrier-Level Spectrum Sensing Method by Utilizing Fine-Grained Channel State Information in Wireless Networks 