The noncoherent receiver is attractive for UWB system implementation in lower data rate applications due to its simplicity for implementation, which, however, is accompanied with the performance degradation. There are some factors that affect the performance of noncoherent receiver, among which is the selection of the pre-filter passband width. In this paper, the inter-path interference incurred by the pre-filter is analyzed numerically and statistically, and the optimal passband widths are analyzed as well based on the derivation of closed-form BER performance expression. It is shown that, the impact of IPI due to the pre-filter is insignificant to noncoherent receiver, and there exist different optimal pre-filter passband widths for different channels and input SNRs. However, the #61485;－3dB/－10dB bandwidth of the Gaussian pulse, as well as 2 times of the pulse width reciprocal, could be treated as a suboptimal filter bandwidth, which would only result in a lightly performance degradation.
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