General Carrier Index Aided Dual-Mode Differential Chaos Shift Keying With Full Mapping: Design and Optimization

In this paper, we propose a general carrier index assisted dual-mode differential chaos shift keying with full mapping (GCI-DM-DCSK-FM) system, where a pair of distinguishable modem-mode signals is designed with the aid of general carrier index modulation. Specifically, the selected and unselected subcarriers are used to carry differential chaos shift keying (DCSK) and quadrature chaos shift keying (QCSK) signals, respectively, thereby obtaining higher data rate and spectral efficiency. To tackle the issue of discarding the subcarrier activation pattern (SAP), an effective full mapping method is proposed for the GCI-DM-DCSK-FM system to harvest better bit error rate (BER) performance and higher data rate. Moreover, a noise decontamination method is designed for the GCI-DM-DCSK-FM system to enhance the BER performance. To confirm the validness for our proposed systems, we derive the BER expressions of the GCI-DM-DCSK-FM system over additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels. Finally, plenty of simulation results show the excellent BER performance of the GCI-DM-DCSK-FM system.