Method and device for detecting a GSM channel of interest
First Claim
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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Accused Products
Abstract
A method for detecting a GSM channel of interest, in a wireless communication device capable of supporting broadband as well as narrowband wireless systems, includes receiving (210) analog signals across a wide bandwidth and identifying (220) possible GSM channels within that wide bandwidth. The wireless communication device then samples (230) the analog signals to produce a time domain digital signal and further chooses (240) a pair of frequencies that correspond to a possible GSM channel. The wireless communication device converts (260) the time domain digital signal at the chosen pair of frequencies into first and second frequency domain digital signals and calculates (270) a power ratio between the first frequency domain digital signal and the second frequency domain digital signal. If the calculated power ratio for the possible GSM channel exceeds a threshold, the wireless communication device determines (280) that the possible GSM channel is the GSM channel of interest.
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Citations
21 Claims
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1. A method in a wireless communication device for detecting a GSM channel of interest, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless communication device for detecting a GSM channel of interest, the device comprising:
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a wide bandwidth receiver for receiving a wide band of frequencies; an analog to digital converter (ADC), coupled to the wide bandwidth receiver, for sampling the wide band of frequencies to create a time domain digital signal; a selector, coupled to the ADC, for choosing a pair of frequencies that correspond to a center frequency of a possible GSM channel and a synchronization burst frequency of the possible GSM channel; an FFT processing module, coupled to the selector, for converting the time domain digital signal into a first frequency domain digital signal near the center frequency and a second frequency domain digital signal near the synchronization burst frequency; a power ratio calculator, coupled to the FFT processing module, for calculating a power ratio between the first frequency domain digital signal and the second frequency domain digital signal for the possible GSM channel; and a processor, coupled to the power ratio calculator, for determining that the possible GSM channel is the GSM channel of interest, if the calculated power ratio for the possible GSM channel exceeds a threshold. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification