A Novel Pulse Based Ultrawide Band System Using Chaotic Spreading Sequences

This paper proposes a novel method of using chaotic binary sequence in pulse amplitude modulation based ultrawideband (UWB) system to suppress interference and hence to improve the Bit Error Rate (BER) performance in the presence of narrowband interference (NBI). It is one of the very important considerations in the UWB systems as the spectrum of UWB overlays with the existing narrowband wireless systems. In the proposed method, the chaotic binary sequence is used across the frames within one symbol duration. The performance of the proposed scheme is analyzed using the channel models proposed by IEEE 802.15.3a working group for short range, high data rate wireless communications. The simulation results show that the proposed system has better BER performance compared to the existing systems, in the presence of NBI. In addition to the suppression of NBI, the proposed scheme has an added level of security due to the chaotic spreading.