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Digital signal quality evaluation circuit using synchronization patterns

  • US 5,054,035 A
  • Filed: 12/21/1989
  • Issued: 10/01/1991
  • Est. Priority Date: 12/21/1989
  • Status: Expired due to Fees
First Claim
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1. A terminal for a mobile radio communication system comprising:

  • means for receiving a digital signal,means responsive to the received digital signal for generating a sequence of symbols partitioned into time frames, each time frame including a prescribed set of synchronization symbols,means for storing a signal corresponding to the prescribed set of synchronization symbols including a first shift register for storing a sequence of symbols representing the prescribed set of synchronization signals in each time frame,means responsive to the prescribed set of synchronization symbols for a plurality of time frames from the symbol generating means and the stored synchronization corresponding signal for generating a signal representative of the differences between the synchronization symbol set generated from the digital signal and the stored synchronization corresponding signal, the means for generating a signal representative of the differences between the synchronization symbol set generated from the digital signal and the stored synchronization corresponding signal comprises means for comparing each prescribed synchronization symbol set generated from the digital signal and the stored synchronization corresponding signal to generate a difference signal,the comparing means comprising;

    a second shift register responsive to the synchronization signals generated from the digital signal for sequentially storing the synchronization symbols generated from the digital signal,a third shift register,means for generating a signal identifying the symbol periods in each time frame corresponding to the prescribed set of synchronization symbols,means connected between the second and third shift registers responsive to the symbol period identifying signal for transferring the synchronization symbols in the second shift register to the third shift register,means responsive to the identified symbol period signal for detecting mismatches between each symbol position in the first shift register and the corresponding symbol position in the third shift register, andmeans responsive to each detected mismatch for generating an error signal, andmeans responsive to the differences representative signal for forming a signal representing the quality of the received digital signal.

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