Abstract: A simple reference-modulated code shifted differential chaos shift keying modulation scheme is proposed, in which additional information bits are delivered by reference signals in code shifted differential chaos shift keying (CS-DCSK) communication system. In this proposed system, reference signals and information signals are modulated by independent code index modulations, which helps to greatly improve the bit transmission rate. According to the unique structure of CS-DCSK signals, a novel detection method is designed to reduce noises in both the reference and information signals, in which received signals are averaged based on segments before correlation. The bit error rate performance of the proposed system is analyzed theoretically and verified by simulation results in the additive Gaussian white noise and multipath Rayleigh fading channels. Results show that the proposed scheme can obtain not only higher bit transmission rate but also better bit error rate performance with reduced system complexity.

Key words: code shifted differential chaos shift keying, code index modulation, reference modulated, system complexity, bit error rate