Expanded Capacity Orthogonal Noise Suppression Multi-level Differential Chaotic Shift Keying Communication System

To address the disadvantages of small transmission rate and poor Bit Error Rate (BER) of M-ary differential chaos shift keying. An expanded capacity orthogonal noise suppression multi-level Differential Chaotic Shift Keying (DCSK) communication system is proposed. An improved orthogonal chaotic signal generator is designed at the transmitter of the system. It can generate four sets of orthogonal chaos-based signals, which can greatly increase the communication capacity. An integrated utility function is defined and a particle swarm algorithm is introduced to optimize each parameter of the system. The theoretical BER equation is derived and the system simulation is analyzed under the Additive White Gaussian Noise (AWGN) channel and Rayleigh fading channel. The integrated utility functions of different systems are also compared. The results show that the system has a lower BER and better integrated utility compared, and has a better practical application.