Multiple-Access Performance of Transmitted Reference UWB Communications With M-Ary PPM
To increase the data rate for Transmitted Reference (TR) Ultra-WideBand (UWB) systems, M-ary Pulse Position Modulation (PPM) is used in this paper. The multiple-access performance of such systems is investigated in a multipath environment. A new method to derive the variance of the Gaussian random variable resulted from Multiple-Access Interference (MAI) is developed using the Power Delay Profile (PDP) of the channel. Ultra-WideBand (UWB) communication systems based on Transmitted Reference (TR) offer implementation advantages compared to systems using rake receivers. The delay-line structure of TR UWB systems avoids the difficult task of channel estimation that is encountered in Rake receivers in dense multipath environments.