Nikos V. Kokkalis

Learn More
—The symbol error probability (SEP) performance of time-hopping (TH) ultra-wideband (UWB) systems in the presence of multiuser interference (MUI) and timing jitter is considered without making the usual Gaussian approximation (GA). Contrary to previous studies restricted to binary modulation formats , we analyze and evaluate the performance of such(More)
In this paper the incorporation of fuzzy arithmetic into Viterbi Algorithm is exploited. Especially the length estimation of trellis paths is based on fuzzy arithmetic. Taking advantage of the newly developed fuzzy processors, this paper aims to show the applicability of fuzzy arithmetic into Viterbi Algorithm by simulating the whole procedure in Borland(More)
The capacity of ultra-wideband (UWB) systems in presence of narrowband interference (NBI) is studied. By appropriately modifying the Shannon capacity formula, an analytical expression for the capacity of M-ary pulse position modulation (PPM) signals in the presence of NBI is obtained. Performance evaluation results for the capacity of such signals as a(More)
  • 1