This paper addresses a novel spectrally-efficient signal model for Ultra Wideband (UWB)-based wireless sensor systems. Indeed, an optimal auxiliary independent signal (AIS) is proposed to suppress undesired spectral lines using a defined spectral optimization problem. A spectral notching scheme based upon digital filtering to synthesize UWB pulses is also designed to limit the interferences caused by the existing narrowband interferers. Based on the current contribution, different transmission scenarios are presented for sensor communications. Finally, the spectral characteristics and performances are evaluated by numerical results.
