This paper introduces new system concepts for an UWB transmitter architecture dedicated to 3.1-5.1GHz band. The latter is developed for an application targeting data rates up to 1Mbps, associated with localization and positioning. First, a pulse shape analysis is done in order to select the best one for our spectrum boundary mask. Then, based on a windowed cosine pulse choice, a transmitter architecture is proposed and two critical blocks, the pulse generator and the antenna, are studied more in detail. Moreover, a link budget is done in order to correlate bandwidth, ranging and localization precision.

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