The improvement of the performance of DS-UWB system based on a switched chaotic sequence

This paper proposes a chaotic PN (pseudo-noise) sequence, which is generated by a novel switched chaotic system. Its fifteen performances are analyzed via current international standard NIST, which is working in the Linux operating system. The analytic results indicate that the switched chaotic sequence can pass NIST test and satisfy the command of DS-UWB system. Also the model of chaos-based DS-UWB communication system is established in the purpose of analyzing the performance of its reception. Using the switched chaotic sequence as spread spectrum address code and simulating its performance with the MATLAB software, at the same time assuming ideal synchronization at the receivers. Simulation results show that the new chaotic sequence is a good PN sequence for bit error rate (BER) performance of the DS-UWB system and more excellent than the conventional sequences such as the m sequence.