A covert communication system using an optimized wideband chaotic carrier

We explore the advantages of designing a communication system based on chaos by using digital signal processing techniques. Existing work developing chaotic communication schemes has been done on a theoretical basis or in component based electrical circuits that are not as flexible, particularly for research. Our work takes a unique technological approach towards exploring the benefits of chaos. We use discrete methods to implement chaotic dynamical systems. Most of our current results are from MATLAB simulations, but we are working towards implementing chaos on digital signal processors (DSPs). These high-speed processors produce a chaotic carrier through flexible software algorithms. The use of discrete methods allows for schemes that out perform earlier systems. We demonstrate a new dual synchronizing response system that exploits the ability to store samples over an entire bit period and then perform, an intelligent comparison. Our results show better bit error probability in comparison to previously published chaotic techniques. We introduce a method and algorithms for improving the bit error performance of our scheme by systematically searching for better parameter sets.