Performance Analysis and Optimization of M-ary Code Shifted Differential Chaos Shift Keying System

In this paper, a power allocation strategy is applied to improve the bit-error-rate (BER) performance of M-ary code shifted differential chaos shift keying system (GCS-MDCSK) system. Particularly, different power coefficients are allocated for the reference and information bearing signals of GCS-MDCSK system, respectively. Moreover, the theoretical BER expressions of GCS-MDCSK system with power allocation strategy are derived over additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels. Then, the optimal power ratio of reference and information bearing signals is deduced by finding the minimum of BER expression. Finally, the BER performance of the optimized GCS-MDCSK system is compared to ordinary GCS-MDCSK and other chaotic communication systems. Numerical results confirm the preferable BER performance of the optimized GCS-MDCSK system.