Mobile receiver whose improved initial synchronization with a fixed station is achieved by frequency estimation by means of impulse detection

摘要

The invention relates to a mobile radio receiver (2) for a radio transmission system with a detection device (6) which is provided for searching a received digital signal (e) for pulses (i) of a frequency control signal contained at a predeterminable frequency in the digital signal (e), and to determine its pulse positions (t), and with a frequency estimating device (7) which is provided for forming estimated frequency values (@) for the predeterminable frequency. This is intended for improving the initial synchronisation of the mobile radio receiver with a base station. For this purpose, it is proposed that the detection device (6) exhibits an averaging circuit (14) which is provided for forming an average value, weighted with weighting factors (Us), of pulse positions (t) determined within successive observation intervals, the weighting factors (Us) being proportional to the respective pulse height (U) of the pulses (i). Digital radio transmission systems. IMAGE