Robust OFDM Timing Synchronisation in Multipath Channels

This paper addresses pre-FFT synchronisation for Orthogonal Frequency Division Multiplex (OFDM) under varying multipath conditions. To ensure the most efficient data transmission possible, there should be no constraints on how much of the Cyclic Prefix (CP) is occupied by Inter-Symbol Interference (ISI). Here a solution for timing synchronisation is proposed, that is, robust even when the strongest multipath components are delayed relative to the first arriving paths. In this situation, existing methods perform poorly, whereas the solution proposed uses the derivative of the correlation function and is less sensitive to the channel impulse response.