A New Multi-Access Scheme For PCTH UWB System

Ultra Wideband(UWB) is a wireless communication technique.It has the characteristics of non-carrier,and use extremely narrow pulses to transmit the information.In recent years,as a novel wireless communication technique UWB emerging,it appeals more and more interest of researchers.Pseudo Chaotic Time Hoping(PCTH) is a recently proposed modulation scheme for UWB impulse radio.Unlike a typical TH-UWB,the PCTH-UWB system exploits concepts from symbolic dynamics to generate aperiodic sequences which modulate the position of pulses. The use of aperiodic TH sequence can enhance the spread-spectrum characteristics of UWB system by removing the spectral feature of the transmitted signal.In this paper,in order to improve the performance of conventional MA-PCTH-UWB system, we propose a new scheme for the multi-access communication of PCTH UWB system by transmitting specific training sequences which initialize the conditions of the shift registers for each user in each frames.The performance of BER of this system is analyzed.