Method and apparatus for detecting jamming signal
DCFirst Claim
1. In a wireless communication device, a method of validating a wireless communication signal, comprising:
- receiving a wireless communication signal;
downconverting the wireless communication signal to an intermediate frequency (IF) signal;
digitizing the IF signal to provide a digital signal;
despreading and demodulating the digital signal to provide a phase of demodulated signal;
for the phase of demodulated signal, monitoring a number of phase transitions during a time interval;
comparing the number of phase transitions during the time interval with a threshold value;
validating the wireless communication signal if the number of phase transitions during the time interval exceeds the threshold value; and
invalidating the wireless communication signal if the number of phase transitions during the time interval is less than the threshold value.
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Abstract
In a wireless communication device (106) a method of detecting a narrowband jamming signal (404) includes receiving a wireless communication signal (104) and downconverting the wireless communication signal (104) to an intermediate frequency (IF) signal (525). IF signal (525) is digitized to provide a digital signal (527). Digital signal (527) is despread, demodulated and monitored for the number of phase transitions (562) occurring during a time interval (556). The method further includes comparing the number of phase transitions (562) during the time interval (556) with a threshold value (560) and determining that the wireless communication signal (104) is not the narrowband jamming signal (404) if the number of phase transitions (562) during the time interval (556) exceeds the threshold value (560), or determining that the wireless communication signal (104) is the narrowband jamming signal (404) if the number of phase transitions (562) during the time interval (556) is less than the threshold value (560).
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Citations
29 Claims
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1. In a wireless communication device, a method of validating a wireless communication signal, comprising:
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receiving a wireless communication signal;
downconverting the wireless communication signal to an intermediate frequency (IF) signal;
digitizing the IF signal to provide a digital signal;
despreading and demodulating the digital signal to provide a phase of demodulated signal;
for the phase of demodulated signal, monitoring a number of phase transitions during a time interval;
comparing the number of phase transitions during the time interval with a threshold value;
validating the wireless communication signal if the number of phase transitions during the time interval exceeds the threshold value; and
invalidating the wireless communication signal if the number of phase transitions during the time interval is less than the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a wireless communication device, a method of detecting a narrowband jamming signal comprising:
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receiving a wireless communication signal;
downconverting the wireless communication signal to an intermediate frequency (IF) signal;
digitizing the IF signal to provide a digital signal;
despreading and demodulating the digital signal to provide a phase of demodulated signal;
for the phase of demodulated signal, monitoring a number of phase transitions during a time interval;
comparing the number of phase transitions during the time interval with a threshold value;
determining that the wireless communication signal is not the narrowband jamming signal if the number of phase transitions during the time interval exceeds the threshold value; and
determining that the wireless communication signal is the narrowband jamming signal if the number of phase transitions during the time interval is less than the threshold value. - View Dependent Claims (9, 10, 11, 12)
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13. In a wireless communication device, a method of monitoring a GPS channel for a narrowband jamming signal comprising:
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receiving a wireless communication signal on the GPS channel;
downconverting the wireless communication signal to an intermediate frequency (IF) signal;
digitizing the IF signal to provide a digital signal;
despreading and demodulating the digital signal to provide a phase of demodulated signal;
for the phase of demodulated signal, monitoring a number of phase transitions during a time interval;
comparing the number of phase transitions during the time interval with a threshold value;
determining that the-wireless communication signal is not the narrowband jamming signal if the number of phase transitions during the time interval exceeds the threshold value; and
determining that the wireless communication signal is the narrowband jamming signal if the number of phase transitions during the time interval is less than the threshold value. - View Dependent Claims (14, 15, 16)
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17. In a wireless communication device, a computer-readable medium containing computer instructions for instructing a processor to perform a method of detecting a narrowband jamming signal, the instructions comprising:
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receiving a wireless communication signal;
downconverting the wireless communication signal to an intermediate frequency (IF) signal;
digitizing the IF signal to provide a digital signal;
despreading and demodulating the digital signal to provide a phase of demodulated signal;
for the phase of demodulated signal, monitoring a number of phase transitions during a time interval;
comparing the number of phase transitions during the time interval with a threshold value;
determining that the wireless communication signal is not the narrowband jamming signal if the number of phase transitions during the time interval exceeds the threshold value; and
determining that the wireless communication signal is the narrowband jamming signal if the number of phase transitions during the time interval is less than the threshold value. - View Dependent Claims (18, 19, 20, 21)
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22. A receiver for a wireless communication device, comprising:
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a downconverter for downconverting a wireless communication signal and transforming the wireless communication signal to a digital signal;
a despreader/demodulator coupled to the downconverter for converting the digital signal to a demodulated signal and outputting a phase of the demodulated signal;
a phase transition counter coupled for receiving the phase of the demodulated signal and counting a number of phase transitions during a time interval;
a comparator coupled for comparing the number of phase transitions during the time interval with a threshold value, wherein if the number of transitions during the time interval exceeds the threshold value the wireless communication signal is a GPS signal, which indicates a pass condition, wherein if the number of transitions during the time interval is less than the threshold value the wireless communication signal is a narrowband jamming signal, which indicates a fail condition, and wherein one of the pass condition and the fail condition is an output of the comparator; and
a means for storing an output of the comparator. - View Dependent Claims (23, 24, 25)
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26. A receiver for a wireless communication device, comprising:
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a means for downconverting a wireless communication signal and transforming the wireless communication signal to a demodulated signal;
a means for outputting a number of phase transitions during a time interval for the demodulated signal;
a means for counting the number of phase transitions during the time interval;
a means for comparing the number of phase transitions during the time interval with a threshold value, wherein if the number of transitions per the time interval exceeds the threshold value the wireless communication signal is a GPS signal, which indicates a pass condition, wherein if the number of transitions per the time interval is less than the threshold value the wireless communication signal is a narrowband jamming signal, which indicates a fail condition, and wherein one of the pass condition and the fail condition is an output of the comparator; and
a means for storing an output of the comparator. - View Dependent Claims (27, 28, 29)
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Specification