The Prefix Design and Performance Analysis of DFT-based Overlapped Frequency Division Multiplexing (OvFDM-DFT) System

This paper propose the theoretical analysis of the DFT based overlapped frequency division multiplexing (OvFDM)/non-orthogonal frequency division multiplexing(NOFDM) communication system, and investigates the impact of conventional cyclic-prefix and zero-padding cyclic-prefix respectively for the OvFDM-DFT system in the time-variant frequency-selective fading channels. The sub-carriers of the DFT based OvFDM/NOFDM communication system are overlapped together and the bandwidth can be larger than the frequency coherence bandwidth, so a kind of implicit frequency diversity will be exploited by the MLSD receiver, which will improve the system performance. Theoretical analysis and simulation results show that zero-padding cyclic-prefix has a much better performance than the conventional cyclic-prefix. The implicit frequency diversity ability of the OvFDM-DFT symbols is also verified by the simulations.