Abstract
In this work, an enhanced differential chaos shift keying (DCSK), based on a first order hybrid chaotic system, is being proposed for a high reliability underwater acoustic communication system. It can be integrated into systems that use standard existing transducers. We show that a coherent operation between the received signal and the time reversal of the basis function in a first order hybrid chaotic system maximizes the signal to noise ratio at the receiver. Concurrently, DCSK configuration is used to resist the distortion caused by the complex underwater acoustic channel. Our simulation results show that the proposed method has lower bit error rate (BER). In addition, it shows higher communication reliability over underwater acoustic channel as compared to the conventional DCSK using logistic map and its variant forms such as Correlation Delay Shift Keying (CDSK), Phase-Separate DCSK (PS-DCSK), High Efficiency DCSK (HE-DCSK), and Reference Modulated DCSK (RM-DCSK).
Highlights
The underwater communication has numerous applications for the marine researchers, oceanographers, marine commercial operators, and defense organizations
The conventional differential chaos shift keying (DCSK) using logistic map [21], NR-DCSK [23], Reference Modulated DCSK (RM-DCSK) [27], High Efficiency DCSK (HE-DCSK) [28], Phase-Separate DCSK (PS-DCSK) [30], Correlation Delay Shift Keying (CDSK) [31], and the proposed method with the same transmission rate are compared in the AWGN channel with different bit energy to noise power spectral density (Eb /N0 ) ratios
The conventional DCSK [21], NR-DCSK [23], HE-DCSK [28], RM-DCSK [27], PS-DCSK [30], CDSK [31] and the proposed method are simulated over the underwater acoustic channel at different
Summary
The underwater communication has numerous applications for the marine researchers, oceanographers, marine commercial operators, and defense organizations. Those methods utilize the orthogonality property of the chaotic signal and the combined information signals of multi-bits to form one frame to be transmitted They achieve higher transmission rates and BER as comparable to the conventional DCSK in presence of additive Gaussian white noise (AWGN) channel. From the energy point of view, the energy efficiency of our proposed method is the same as the conventional DCSK It doubles the data transmission rate by sending one bit information within one time slot, and simplifies the structure of the communication system by eliminating the delay and switch components, which are necessary and difficult to implement in the conventional DCSK system [22,27,28].
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