Influence of Timing Offset in Multiband OFDM Systems

In Cyclix Prefix OFDM (CP) systems, synchronization to the maximal multipath signal generally causes no problem, however, inter carrier interference (ICI) will be introduced in Zero-padding OFDM (ZP-OFDM) systems, e.g, multiband OFDM UWB (MB-OFDM) systems. In this paper, based on the overlap-and-add (ZP-OFDM-OLA) method typically applied in MB-OFDM, we analyze the cause of the ICI and the performance degradation due to the ICI. The expressions of the channel estimation error, signal-to-noise ratio and ICI are derived. Simulation results are also provided, which show good match with the theoretical results.