Abstract
Recently, pulse position amplitude modulation (PPAM) has been proposed for ultra-wideband (UWB) communication systems. PPAM combines pulse position modulation (PPM) and pulse amplitude modulation (PAM) to provide better performance and higher system capacity with low computational complexity. A RAKE receiver can make use of the rich multipath of UWB systems to improve system performance and capacity. In this paper we present the capacity of a RAKE receiver employing maximal ratio combining (MRC) in a time hopping (TH) UWB system with PPAM modulation. Single user capacity and a capacity limit based on FCC Part 15 rules are derived for a realistic multipath fading environment. Numerical results are given to illustrate the system capacity
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