Low-complexity and Robust Detection for Hybrid Chaos Communication

Abstract

Hybrid chaos communication (HCC) is a promising technique which enables secure wideband transmission. It outperforms the conventional chaos communications in reliability when using the matched-filter-based detection. However, the detection process is computationally intensive and requires prior knowledge of the inter-symbol interference (ISI) which is unavailable in general. Besides, the circuit implementation is sensitive to parameters. Regarding these concerns, we propose a low complexity and robust detection, which requires no prior knowledge. Specifically, the proposed demodulator retrieves the information by cumulatively summing over the difference between the received signal and its time-delayed version. Then, the cumulative sum is compared with a pre-determined threshold to make the final decision. The bit error rate is derived for the channel with additive Gaussian white noise. Numerical results validate the analysis and demonstrate that the proposed detector lowers down the computational complexity significantly at little reliability cost compared to the conventional detector.