A New Multi-Access Scheme for PCTH UWB System

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 N_s frames. The performance of BER of this system is analyzed.