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The power spectral densities of UWB impulse radio systems with pulse position modulation (PPM) consist of both continuous spectra and discrete frequency spikes. These discrete spikes cause interferences to narrowband systems and deny the harmless coexistence of PPM UWB systems and narrowband systems. To suppress these discrete spikes, in this paper, a random pulse carrier phase jitter (PCPJ) technique...
We have recently proposed the Code-shifted-reference impulse UWB radio that overcomes the technical challenges encountered by other UWB systems. Further to our previous work, this paper presents a transmitter structure which implements the Code-Shifted Reference UWB transmission scheme. The transmitter is shown to operate in the lower UWB spectrum (3-5 GHz), with a center frequency of 4.44 GHz. It...
UWB systems based on impulse radio (IR-UWB) have the potential to provide very low duty cycles and low power consumption. Furthermore, IR-UWB has the advantages of being able to carry out precision localization and to handle multi-path signals. Consequently, with its low implementation complexity, it is an ideal candidate for sensor network applications. In an IR-UWB system, pulse generator is a key...
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