Abstract
AbstractIn this paper, it is shown that some spikes exist in power spectral density (PSD) of ultra‐wideband‐time‐hopping‐pulse‐position‐modulation (UWB‐TH‐PPM) transmitted signal. Analytical and numerical simulation results show that these spikes severely degrade UWB‐TH‐PPM system bit‐error‐rate performance and must be properly removed. This paper proposes a novel multi‐access scheme that uses both direct‐sequence (DS) and time‐hopping (TH) multi‐access schemes to remove these harmful spikes. Analytical and numerical simulation results show that the proposed scheme removes the spikes from the PSD of the UWB‐TH‐PPM transmitted signal and yields better performance. In this paper, the performance of the proposed multi‐access scheme is examined with numerical simulations in the presence of additive white Gaussian noise (AWGN), multipath interference (MPI), narrow‐band interference (NBI), and multi‐access interference (MAI); and furthermore closed form representations for the probability of error of both proposed and conventional multi‐access UWB‐PPM schemes are given. Copyright © 2006 AEIT
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