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

Figure 4

Time domain signals of the simulation system using Tent map for case of [𝑁_min=21,𝑁_max=41].

(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 PN sequence at the output 2

(e) The binary data with variation of bit duration

(f) The signal after spreading

(g) The output signal of the integrator

(h) The output signal of the sampler

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