| 摘要 |
<p>For performing a coarse frequency synchronization compensating for a carrier frequency deviation from an oscillator frequency in a demodulation system (130) capable of demodulating a signal having a frame structure, the frame structure comprising at least one useful symbol (162) and a reference symbol (166) which is an amplitude-modulated sequence, firstly the signal is received. Thereafter, the received signal is down-converted. Then, an amplitude-demodulation of the down-converted signal is performed in order to generate an envelope. This envelope is correlated with a predetermined reference pattern in order to determine the carrier frequency deviation. Finally, the oscillator frequency is controlled based on the carrier frequency deviation. The reference symbol may comprise two identical sequences (300). In this case, the envelope obtained by the amplitude-demodulation has two portions which are based on the identical sequences (300). One of the portions of the envelope is correlated with the other one of the portions in order to determine the carrier frequence deviation. The oscillator frequency is controlled based on the determined carrier frequency deviation.</p> |
