A Spectrum Efficient Secure Transmission Scheme Based on Directional Polarization Modulation for Wireless Communication Systems

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/mpe/volume-2018/2179617/figures/2179617.fig.003a.svgz" name="2179617.fig.003a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Traditional QPSK</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/mpe/volume-2018/2179617/figures/2179617.fig.003b.svgz" name="2179617.fig.003b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>QPSK in polarization 1</td></tr></table>

<div>QPSKP constellation structure.</div>

Mathematical Problems in Engineering

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Figure 3

Figure 3: A Spectrum Efficient Secure Transmission Scheme Based on Directional Polarization Modulation for Wireless Communication Systems 