A Chaos-Based Secure Direct-Sequence/Spread-Spectrum Communication System

Figure 7

Time domain signals in the receiver of the simulation system using Tent map for case of [𝑁_min=21,𝑁_max=41] with no mismatch and with initial value mismatch (Δ𝑋₀=0.0001).

(a) The discretely increasing signal at output of the counter

(b) The chaotic signal at output of the nonlinear converter

(c) The variable-position pulse train at the output 1

(d) The recovered data bits at output of the decision device