Transmitted Reference Ultra-Wideband Communications With M-ary PPM

To increase the transmission data rate, the authors propose to use M-ary Pulse Position Modulation (PPM) for Transmitted Reference (TR) Ultra-WideBand (UWB) systems. The performance of TR UWB systems employing M-ary PPM is investigated in multipath, multiuser environments without centralized power control. The interference from high-power users is shown to significantly degrade the performance of TR UWB systems using M-ary PPM. Chip discrimination is used to mitigate the detrimental effect of high-power users. Theoretical analysis on the performance of M-ary PPM applied to TR UWB systems is derived. A tight upper bound for the symbol error probability is obtained.