Denoising-enhanced differential chaos shift keying with joint dual orthogonal codes and time-frequency index modulation

Gang Zhang, Yanan Hu, Xibiao Chen and Yunhan Pei

Chaos, Solitons & Fractals, 2025, vol. 197, issue C

Abstract: We propose a joint dual orthogonal code, time slot, and carrier index modulation differential chaos shift keying (JDOCTF-IM-DCSK) system to enhance data rate and energy efficiency. In this system, index bits are mapped to different states of time slots, carriers, and orthogonal codes, enabling the transmission of reference signal without additional time-frequency resources by leveraging the differences between the signal in the first time slot and the remaining time slots. At the receiver, three-stages of denoising are applied to reduce noise interference, and two algorithms are proposed to effectively recover the index and modulated bits of the JDOCTF-IM-DCSK system. Under Additive White Gaussian Noise (AWGN) and multipath Rayleigh fading channels, the theoretical bit error rate (BER) of the JDOCTF-IM-DCSK system is derived and its accuracy is validated. Furthermore, this study compares the system's data rate, spectral efficiency, energy efficiency, complexity, and BER with other similar systems, highlighting the overall superior performance of the JDOCTF-IM-DCSK system.

Keywords: Differential Chaos Shift Keying (DCSK); Index modulation; Noise reduction; High data rate; BER (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:197:y:2025:i:c:s0960077925004886

DOI: 10.1016/j.chaos.2025.116475

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