Inter-Frame Interference in Time Hopping Impulse Radio Based UWB Systems for Coherent Receivers

Ultra Wideband (UWB) Systems take advantage of collecting energy from a large number of multipaths. In high data rate systems for time hopping (TH) UWB transmission, this large number of multipaths may leak into neighboring frames causing inter-frame interference (IFI). Most studies so far avoid this IFI by placing one or more constraints on chip length, frame length, minimum pulse to pulse duration, etc. In this paper, IFI will be investigated in detail for BPSK and PPM modulations in coherent transceivers. It will be shown that IFI effect is insignificant for these modulation options and for these transceiver architectures. Therefore, the constraints to avoid IFI can be removed for those systems. To the best knowledge of the authors, this type of analysis has not been conducted before and the simulation and semi-analytical analysis both result in a novel conclusion.