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

LIMITED DISTRIBUTION NOTICE:

This Research Report is available. This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a Research Report for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be limited to peer communications and specific requests. After outside publication, requests should be filled only by reprints or legally obtained copies of the article (e.g., payment of royalties). I have read and understand this notice and am a member of the scientific community outside or inside of IBM seeking a single copy only.

rz3544.pdf

Questions about this service can be mailed to reports@us.ibm.com .