A Spectrum-Efficient Cross-Layer RF Distance Bounding Scheme

<div>The illustration of the SFCW signal and its spectrum consumption. (a) The SFCW signal shown in the time domain. It utilizes signals at discrete frequency points to compose a wideband signal. (b) The SFCW signal shown in the frequency domain. SFCW signal only occupies discrete frequency points, thereby freeing the spacings between the frequency points.</div>

Security and Communication Networks

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Figure 2

Figure 2: A Spectrum-Efficient Cross-Layer RF Distance Bounding Scheme 