Impact of TH-UWB interference on MB-OFDM UWB systems: interference modeling and performance analysis

摘要

In this paper, the coexistence issue between multiband-orthogonal frequency-division multiplexing (MB-OFDM) and time-hopping ultra-wideband (TH-UWB) networks is widely analyzed. For this purpose, to study and model the TH-UWB interference, an analytical framework which describes key features of the interference distribution is provided. The interference distribution is studied in the context of TH-UWB's signaling parameters. Our results reveal that the interference distribution highly depends on its time-hopping parameters. Therefore, choosing proper time-hopping parameters leads to less destructive interferences. The Generalized Gaussian and the Symmetric-alpha-Stable (S alpha S) distributions are used to model the interference-plus-noise signal. The maximum likelihood and a characteristic function-based regression-type methods are adopted to estimate parameters of Generalized Gaussian and S alpha S distributions, respectively. Moreover, the interference channel effects on the impulsive behavior of the TH-UWB signal is studied. It is shown that impulsive behavior of the faded interference signals highly depends on the channel time-dispersiveness. Furthermore, an exact performance of a multiband-orthogonal frequency-division multiplexing system impaired by a TH-UWB system is derived. The comparison of the analytical performance, the empirical simulation, and the approximation results show that both approximation methods are valid for low interference-to-noise-ratio, while S alpha S provides a more accurate approximation for high interference-to-noise-ratio. Copyright (C) 2015 John Wiley & Sons, Ltd.