| 摘要 |
<p>Method and device for the synchronization between a mobile radio station and a base station in a digital radiomobile system TDMA where the base station transmits a timeslot containing a preset frequency sinusoid. The method foresees to sample (according to different methods) the baseband demodulated signals and to measure the phase increases between two subsequent samplings. Increases are compared with an intermediate threshold value between 0° and 180° to construct a vector formed by a series of values referred to subsequent samplings, the current amount of which is calculated. The minimum value of this sum is then identified to approximatively synchronize the mobile station with the timeslot containing the sinusoid. Afterwards, the frequency offset between the local oscillator frequency and the base station one is calculated and corrected in order to correctly identify the timeslot containing the preamble for fine synchronization. Then the decoding of the message containing the station and the frame data is performed. The device performs this method, for instance with an implementation by means of a programmed processor.</p> |
