Research Article
Multitarget Position-Sensitivity Security Transmission with OAM-DM Based on FDA
Figure 3
Random Nx and frequency offset of FDA elements in the desired range. (a) Random Nx with l = 1. (b) Frequency offset with l = 1. (c) Random Nx with l = −1. (d) Frequency offset with l = −1. (e) Random Nx with l = 2. (f) Frequency offset with l = 2. (g) Random Nx with l = −2. (h) Frequency offset with l = −2. A set of points arranged vertically from blue to gray represent the frequency offset of eight elements in (d), (f), and (h).
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