Narrow Band Interference (NBI) mitigation technique for TH-PPM UWB systems in IEEE 802.15.3a channel using wavelet packet transform

Impulse Radio Ultra Wideband (IR-UWB) systems have been studied for their inherent advantages of coexistence with narrowband systems with high data rate over short distances with sufficiently small amount of transmitted power. UWB systems are highly susceptible to interference from coexisting narrowband systems because of very low power transmission. In this paper, we have studied the effect of narrowband interference (NBI) on the bit error rate (BER) performance of time hopping pulse position modulated ultra wide band (TH-PPM UWB) systems in IEEE 802.15.3a channel model. The method of wavelet packet is employed in pulse shaping to reduce the effect of NBI on the bit error rate performance. The NBI taken in consideration is the interference from IEEE 802.11a wireless local area network (WLAN) at 5.2GHz band. The simulation results show that wavelet packet based pulse shaping is an effective approach to reduce the effect of narrowband systems in coexistence with UWB systems.