Impact of the FCC Average- and Peak Power Constraints on the Power of UWB Radio Signals

UWB radio signals for communication and/or position location have an extremely low power spectral density, such that other devices, in particular narrowband radio receivers, experience only a marginal performance degradation, if any. The binding regulation for the emission limits of UWB radio devices released by the FCC consists essentially of the allowed frequency range as well as average, and peak-power constraints. In this paper we investigate the impact of these constraints on the maximum emission power-spectral-density of UWB radio signals for different modulation schemes by both, analysis and simulation. We point out that for a given signal, the peak power constraint may or may not be active, depending on the resolution bandwidth used to measure the peak power; the reasons for this as well as solutions to avoid this dependency are proposed. New insights on the requirements for achieving spectral flatness of UWB signals are obtained.

By: Martin Weisenhorn and Walter Hirt

Published in: RZ3544 in 2004


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