TH31580A - Methods and devices for coarse frequency synchronization - Google Patents

Abstract

The DC60 (26/06/46) is initially received a signal for performing a compensated coarse frequency synchronization. Deviation of the carrier frequency from Oscillator frequencies in the demodulation system (130) capable of demodulation. Which has a frame structure where the frame structure is composed of At least one useful symbol (162). And reference notation (166), which is the order in which Modulated amplitude After that, the received signal is converted downward. Subsequently, down-converted signal amplitude demodulation is performed. To remember to operate, this envelope is correlated with a predetermined reference pattern. In order to determine the deviation Finally, the frequency of the oscillator is controlled based on the reference symbol pah frequency deviation. May contain Two (300) identical sequences. In this case, the envelope is derived from the amplitude modulation. There will be two parts. Which depends on the order in which Exactly the same (300) One of the entities of the Envelop is related. Together with one another from that section to determine the oscillator frequency wavelength deviation. It is controlled based on the pah frequency deviation that is initially determined, a signal is obtained for performing a coarse frequency synchronization that compensates for the oscillation frequency deviation from the frequency. A oscillator in a demodulation system (130) capable of demodulation with a frame structure, where the frame structure is composed At least one useful symbol (162). And reference symbols (166), which are respectively Modulated amplitude After that, the received signal is converted into a later amplitude modulation of the converted signal. Down will be executed In order to give birth to the envelope, this envelope is correlated with the correct reference pattern. Predetermined In order to determine the diversion Deflect the frequency of the pah. Eventually, the oscillator frequency will Is regulated depending on the frequency deviation Reference symbol May contain Two (300) identical sequences. In the case of the amplitude-modulated envelope, there are two parts. Which depends on the sequence Exactly the same (300) one of the envelope segments is coherent with the other from that segment in order to determine the oscillation's pah-frequency deviation. Letter Will be controlled depending on Deflected frequency deviation

Claims (1)

1.Rough frequency synchronization operation method That compensates for the wavelength deviation from the frequency of the oscillator in A demodulation system (130) capable of demodulation with a frame structure consisting of At least one useful symbol (162). And the reference symbol (166) where the reference symbol (166) is the amplitude modulated sequence, which consists of the following steps: To convert such a received signal down, the signal amplitude demodulation operation is tagged: