Receiver and method for initial synchronization of a receiver with the carrier frequency of a desired channel

A receiver, in particular a GSM receiver, with initial synchronization for receiving an analog signal with a desired carrier frequency, comprising:

• a reference oscillator for generating a reference signal with a reference frequency;
• a phase lacked loop with a variable frequency divider circuit for generating a local frequency which corresponds at least approximately to the desired carrier frequency;
• a mixer for generating a mixed signal by mixing the locally generated carrier frequency with the desired carrier frequency;
• a timer for generating a first control signal as determined by the reference signal;
• an A/D converter for receiving and digitizing the mixed signal starting from an expected receiving instant which is predetermined by the first control signal;
• and
• a skew-detection device for receiving the digitized mixed signal and for generating an output signal, the output signal representing a skew between an expected and an actual receiving instant of the received signal;
• characterized in that there are provided a comparator for receiving the output signal of the skew-detection device, in order to establish whether the skew exceeds a prescribed threshold value, and to output a corresponding information signal;
• and
• an evaluation device for calculating and outputting a corrected reference frequency in the form of a second control signal, via a D/A converter, to the reference oscillator, and for calculating and outputting a corrected divider ratio in the form of a third control signal to the variable frequency divider circuit such that the reference oscillator is set to the corrected reference frequency and the frequency divider circuit is set to the corrected divider ratio, the calculation and output of the corrected reference frequency and of the corrected divider ratio being performed only when the skew exceeds the threshold value as determined by the information signal.