Enhanced investigations on effective isotropic radiated power emissions of impulse radio devices

A theoretical approach is described to determine the equivalent isotropic radiated power (EIRP) of Ultra-Wideband (UWB) impulse radio (IR) transmitters with a very high accuracy. The EIRP is derived from the power spectral density (PSD) of an IR signal model which comprises statistical and physical characteristics. Different components of the transmitter, including the radiation properties of the antennas, are characterized with corresponding impulse responses to increase the precision of the computed EIRP. To verify the theoretical investigations, measurements of exemplary 2-ary modulation schemes have been carried out. A specifically developed software defined radio (SDR) IR transmitter is used to generate arbitrary impulse trains with various modulation schemes and impulse shapes. The resulting EIRP is determined by characterizing the single components of the transmitter with high precision individual measurements or by performing compliance measurements. The theoretical and measured results show very good agreement and hence the presented method is perfectly suited to design IR UWB transceivers.