With the fast development of wireless sensor networks (WSN), more attentionsare paid to high data rate transmission of WSN, and hence, in IEEE 802.15.4astandard, ultra-wideband (UWB) is introduced as one of the physical layertechnique to support high transmission data rate and precisie locationingapplications. In order to analyze the bit error rate (BER) performance of UWBbased WSN, a system model considering intra-symbol interference (IASI),inter-symbol interference (ISI), multiuser interference (MUI) and addictivewhite Gaussian noise (AWGN) is proposed in this paper, and then verified usingsimulation results. Moreover, the pulse waveforms complying with the spectrumrequirement of IEEE 802.15.4a standard are given, and based on such obtainedpulses, the effect of transmission data rate and user number is also shown.Results show that with the increase of SNR, the intra-symbol interference willdecrease the system performance significantly, and system performance can beimprove by using pulse waveforms with little intra-symbol interference.
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