Performance Characterization of UWB SSMA Using Orthogonal PPM-TH in Dense Multipath

Abstract

In this work we study ultra wideband (UWB) communications over dense multipath channels using orthogonal pulse position modulation (PPM) for data modulation and time-hopping (TH) for code modulation. We consider the effects of the multiple access interference (MUI) in asynchronous spread spectrum multiple access (SSMA) based on random TH codes. We consider a realistic multipath channel to analyze the effects of the transmission rate in the number of users for different bit error rate (BER) values.