Spectral spike reduction for ultra-wideband impulse radio system

The transmitted power spectra of commercial ultra-wideband (UWB) radios are subject to very strict low-emission mask requirement due to their potential to interfere with existing narrowband systems. On the other hand, ultra-short impulse transmission technologies, such as the recently developed differential code-shifted-reference system, provide a promising time-domain transceiving technology for new UWB designs. Unfortunately, such short impulse transmission often generates spectral spikes that force UWB transmit power back off of more than 10dB. In this paper, we present an application of a simple technique to reduce these spectral spikes. As a result, the UWB impulse radio output power can be maximized within the regulatory emission mask for developing a practical low-cost UWB impulse radio system.