Generalized Multilevel Code-Shifted Differential Chaos Shift Keying Modulation System

To achieve a high data rate while maintaining a low peak to average power ratio (PAPR), a novel generalized multi-level code-shifted differential chaos shift keying modulation system is proposed. In this system, both the reference and multiple data-bearing signals transmit data bits through code index modulations performed on the same set of Walsh codes, leading to enhanced utilization of indices and increased data rate. In addition, each data-bearing signal transmits one extra bit using differential chaos shift keying modulation. To mitigate high PAPR, discrete cosine spreading codes are employed to distinguish between the reference and data-carrying signals. Two receiver configurations are designed to balance low complexity and improved bit error rate performance. Bit error rate performances are analyzed and simulated under the additive white Gaussian noise and multipath Rayleigh fading channels. Finally, comparisons are made between the proposed and other CS-DCSK-based systems, which illustrates that our system can offer an increased data rate and superior bit error rate performance, along with a reduced PAPR.