Very high efficiency differential chaos shift keying system

In this study, a new non‐coherent communication system, i.e. very high efficiency differential chaos shift keying system, is proposed. This system is a generalised form of the high efficiency differential chaos shift keying (HE‐DCSK) system, with an arbitrary number ( N ) of transmitted bits per frame. The major advantage of this new proposition is its ability to significantly improve the spectral efficiency compared with DCSK and HE‐DCSK. The theoretical bit error rate of this system is found using the Gaussian approximation method under different communication channels: additive white Gaussian noise and two‐ray Rayleigh fading channels. Simulations in both environments show a perfect match with the analytical expressions for large spreading factors. Simulation results for the two‐ray Rayleigh fading channel show clearly the diversity gain compared with the single‐ray Rayleigh channel.