Power Spectral Analysis of Orthogonal Pulse-Based TH-UWB Signals

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The paper analyzes Power Spectral Density (PSD) of orthogonal pulse-based signals for Time Hopping Ultra WideBand (TH-UWB) systems. The authors' extensive studies show that the PSD of these signals not only depends on the time dithering code and the modulation schemes, but also on the Energy Spectral Density (ESD) of orthogonal pulses. The different order orthogonal pulses provide different ESD which changes the shape of continuous spectral component with symbols. They show that orthogonal pulse-based signals reduce the dynamic range of amplitude of discrete spectral components. Further, they reduce the dynamic range by adopting longer TH code over orthogonal pulse-based signals.