Abstract
The paper analyzes power spectral density (PSD) of orthogonal pulse-based signals for time hopping ultra wideband (TH-UWB) systems. Our 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. We show that orthogonal pulse-based signals reduce the dynamic range of amplitude of discrete spectral components. Further, we reduce the dynamic range by adopting longer TH code over orthogonal pulse-based signals. As a result, UWB system performance improves with average transmitted power. The theoretical analysis of PSD of orthogonal pulse-based TH-UWB signal is provided in details and verified through simulation results.
Highlights
Impulse radio Ultra Wideband (IR-UWB) radio is a promising technology for short range wireless communications
The simulation results are provided for power spectral density (PSD) of time hopping ultra wideband (TH-UWB) signal for orthogonal PPM (OPPM) and OPPM-pulse shape modulation (PSM) schemes based on modified Hermite pulses (MHPs)
Since bi-orthogonal PSM (BPSM) and OPPM-BPSM have antipodal signal, they have only continuous spectral component and shape of their spectral is same as continuous component of non antipodal signal
Summary
Impulse radio Ultra Wideband (IR-UWB) radio is a promising technology for short range wireless communications. The orthogonal pulse-based modulation schemes are becoming more popular due to the simplicity of newly developed pulse designed algorithms [6,7]. The efficiency of these orthogonal pulses is studied in [8,9]. We analyze the power spectral density of orthogonal pulse-based TH-UWB signal for PSM, BPSM, OPPM-PSM and OPPM-BPSM schemes. We show that orthogonal pulse-based modulation schemes adjust the continuous power spectrum component with FCC limitation and reduce the dynamic range of the amplitude of the discrete spectral components. The simulation results are provided for PSD of TH-UWB signal for OPPM and OPPM-PSM schemes based on modified Hermite pulses (MHPs).
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