An enhanced scheme for differential chaos communication system

In this paper, a differential Chaotic ON-OFF Keying Scheme is proposed and named Differential Chaos ON-OFF Keying (D-COOK). The system scheme is a combination of the standard Differential Chaos Shift Keying (DCSK) and the Chaotic ON-OFF Keying (COOK) schemes. Each information bit is sent either by sending two identical chaotic segments within one bit duration or null transmission within same bit duration. This reduces the internal signal interference contribution at the correlator output and enhances BER performance. The proposed scheme is simulated and compared with the Differential Chaos Shift Keying (DCSK), Correlation Delay Shift Key (CDSK) and Chaotic-On-Off Keying schemes in Additive-White-Gaussian-Noise environment and with different values of the spreading factors. The results show that the BER performance of D-COOK scheme has considerable advantage compared with the DCSK, CDSK, and COOK at fixed level of average bit energy.