Ultrawideband Communications in the Presence of Spatially Distributed Narrowband Interferers

This paper presents an analytical approach to derive the outage probability of an ultrawideband (UWB) communication in the presence of narrowband (NB) interference. In particular, we propose a closed-form expression for the bit error probability of UWB systems adopting a Rake receiver and affected by multiple NB interferers. The spatial distribution of the interferers is accounted for by resorting to a Poisson point process in the two-dimensional plane. The realistic scenario considered accounts for asynchronous interfering nodes in a wireless environment subject to path loss, log-normal shadowing, and fast fading: flat Rayleigh fading for the NB nodes, and frequency-selective Nakagami-m fading for the UWB link. Through the derivation of the aggregate NB interference statistic, the proposed approach is able to predict the performance of the UWB link in terms of bit error outage. Therefore, the analysis can be useful to assess the possible coexistence between UWB and NB networks.