In-band interference power caused by different kinds of UWB signals at UMTS/WCDMA frequency bands

This paper studies in-band interference caused by different kinds of ultra wideband signals in UMTS frequency bands as a function of UWB pulse width. UWB frequency spectra are produced by using several types of narrow pulse waveforms. Due to the extremely wide bandwidth these signals will spread over the frequency bands allocated to other RF-systems. Study revealed that one can reduce interfering UWB power by using different waveforms and pulse widths to avoid UMTS frequencies without any additional filtering. The simulations did not make a significant difference between time hopping and direct sequence concepts when interference was calculated at the UMTS bands.