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Method and device for detecting a GSM channel of interest

  • US 8,204,013 B2
  • Filed: 01/28/2009
  • Issued: 06/19/2012
  • Est. Priority Date: 02/15/2008
  • Status: Active Grant
First Claim
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1. A method in a wireless communication device for detecting a GSM channel of interest, the method comprising:

  • receiving analog signals spread over a wide bandwidth;

    identifying a possible GSM channel within the received analog signals;

    sampling the analog signals to produce a time domain digital signal;

    choosing a pair of frequencies that correspond to a center frequency of the possible GSM channel and a synchronization burst frequency of the possible GSM channel;

    converting the time domain digital signal at the chosen pair of frequencies into a first frequency domain digital signal and a second frequency domain digital signal;

    calculating a power ratio between the first frequency domain digital signal and the second frequency domain digital signal; and

    determining that the possible GSM channel is the GSM channel of interest, if the power ratio exceeds a threshold.

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