METHOD AND SYNCHRONIZER FOR FINE OFDM SYMBOL SYNCHRONIZATION AND METHOD/RECEIVER FOR THE RECEPTION OF OFDM SYMBOLS

摘要

A fine OFDM symbol synchronization method comprising the steps of: estimating (in 36) a channel impulse response (CIR) from received predetermined pilots present in OFDM symbols, the predetermined pilots being arranged within the OFDM symbol at frequency intervals corresponding to n carrier frequencies, and their positions being shifted by k carrier frequencies from one OFDM symbol to the next, so that it is sent on the same frequency earner every m OFDM symbols, and thus m*k = n, m, n and k being integer numbers greater than one, and fine-tuning (in 60) the position of a time-domain-to-frequency- domain window used for receiving OFDM symbols, according to the position of at least one power peak in the estimated channel impulse response, wherein, if there are channel impulse response replicas in the estimated channel impulse response, the positions of correlated power peaks spaced apart by a multiple of Formula (I) is used for finding the position of the at least one power peak used n for fine-tuning, where Tu is the duration of the modulation of an OFDM symbol minus the guard interval.