Multitarget Position-Sensitivity Security Transmission with OAM-DM Based on FDA

<div>Relationship between the desired range and the frequency offset in FDA. Eight black lines represent frequency offsets of eight elements at the desired range. (a) <i>l</i> = 1. (b) <i>l</i> = −1. (c) <i>l</i> = 2. (d) <i>l</i> = −2.</div>

Security and Communication Networks

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Figure 4

Figure 4: Multitarget Position-Sensitivity Security Transmission with OAM-DM Based on FDA 