A novel Chaotic Stream DS-UWB system

The novel chaotic stream DS-UWB system proposed in this paper accomplishes synchronization, modulation and encryption of data in only one channel transmission mechanism. The architecture of the system combines the chaotic pulse position modulation, the complex chaotic stream ciphers encryption and the chaotic direct spread codes with the PAM based DS-UWB communication system. The synchronization of the system is robust with noise and distortion. To overcome problems caused by the digital finite precision, the cipher systems are designed carefully to guarantee Shannonpsilas three principles of secure systems. The chaotic direct spread code is changing with time just as the chaotic stream ciphers, which provides a better performance on security, spectrum and multi-access. Results of simulations show that the chaotic stream DS-UWB has much better BER performances (3~5 dB) than the ordinary DS-UWB when the channel is multi-path channel.