Vu Van Yem

TL;DR: A chaos-based secure direct-sequence/spread-spectrum (DS/SS) communication system which is based on a novel combination of the conventional DS/SS and chaos techniques is proposed, and data security is improved significantly.

TL;DR: This chapter presents a three-dimensional autonomous system without any equilibrium point which can generate hidden chaotic attractor, and the fundamental dynamics properties of such no-equilibrium system are discovered by using phase portraits, Lyapunov exponents, bifurcation diagram, and Kaplan–Yorke dimension.

TL;DR: This study designs and analyses a new phase-coded spread-spectrum communication system where both phase- coded carrier and spreading factor are varied based on a chaotic behaviour in the communication process to reduce the probability of interception of the considered system.

TL;DR: By replacing the conventional Pseudo-random Noise sequence with a NRZ-chaos sequence in CDSSS, data security of the combination system is enhanced significantly and the dependence of Bit Error Rate (BER) performance on the number of symbols, spreading factor and different chaotic sequences in both Additive White Gaussian Noise and Rayleigh Fading channels is characterized.

TL;DR: A 4×4 dual-band MIMO antenna which operates at 28 and 38 GHz bands for future fifth-generation (5G) wireless technology is proposed and achieves low mutual coupling for all operating bands with close distance of 0.7mm.