Analyzing a particular wireless signal based on characteristics of other wireless signals
The present disclosure discloses a system and method for classifying Wi-Fi signals from Fourier transform samples. Generally, classifying Wi-Fi signals from Fourier transform samples includes: collecting and dividing Fourier transform samples into frequency blocks; determining the bandwidth for the Fourier transform sample; and determining whether the Fourier transform sample corresponds to a narrowband signal. Further, if a determination is made that the Fourier transform sample does not correspond to a narrowband signal, channel utilization is calculated based on a determination that the FFT sample corresponds to a Wi-Fi signal. If it is determined that the Fourier transform sample corresponds to a narrowband signal, then a determination is made that the FFT sample corresponds to a Wi-Fi signal based on certain criteria. The certain criteria may include one or more of a slope value, a number of sub-peak bins, an analysis of adjacent channels, characteristic matching, or other criteria.
1. A non-transitory computer readable medium comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising:
determining when a difference between signal strengths of a first wireless signal received in a first time period and a second wireless signal received in a second time period is greater than a threshold;
determining when the first wireless signal is transmitted from a first source and when the second wireless signal is transmitted from a second source;
determining a signal strength of a third wireless signal from samples corresponding to the third wireless signal received in a third time period;
determining when a difference between the signal strength of the first wireless signal and the signal strength of the third wireless signal is less than the threshold; and
estimating when a duration of a wireless signal burst from the first source is longer than the first time period.
2. The computer readable medium of claim 1 , comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising determining when a first set of wireless signals has a higher signal strength than a second set of wireless signals.
3. The computer readable medium of claim 2 , wherein determining when the first set of wireless signals has a higher signal strength than the second set of wireless signals includes:
determining a first average signal strength for a plurality of wireless signals corresponding to the first set of wireless signals;
determining a second average signal strength for a plurality of wireless signals corresponding to the second set of wireless signals; and
comparing the first average signal strength the second average signal strength.
4. The computer readable medium of claim 1 , further comprising instructions which, when executed by one or more hardware processors, causes performance of operations comprising:
determining that a characteristic associated with the first wireless signal matches that of the third wireless signal, wherein the third wireless signal was previously classified as a Wi-Fi signal; and
classifying the first wireless signal as a Wi-Fi signal based on the determination that the characteristic associated with the first wireless signal matches that of the third wireless signal.
5. A computing device, comprising:
one or more processors; and
a memory having instructions stored thereon, which when executed by the one or more processors, cause the computing device to perform operations including:
generating a plurality of frequency bins for received wireless signals based on a time period for each of the received wireless signals;
identifying a peak frequency bin from the plurality of frequency bins based on a signal strength of received wireless signals within the plurality of frequency bins;
determining a slope value based on a decrease in signal strength between the peak frequency bin and a different frequency bin from the plurality of frequency bins;
comparing the slope value to a threshold value; and
determining whether the received wireless signals correspond to a Wi-Fi signal based on the comparison.
6. The computing device of claim 5 , wherein the received wireless signals are determined to be Wi-Fi signals when the slope value is greater than the threshold value.
7. The computing device of claim 5 , wherein the received wireless signals are determined to be narrow band interference signals when the slope value is less than the threshold value.
8. The computing device of claim 5 , wherein the slope value is an average slope value of a plurality of slope values.
9. The computing device of claim 8 , wherein the average slope value includes frequency bins that precede the peak frequency bin.
10. The computing device of claim 8 , wherein the average slope value includes frequency bins that are subsequent to the peak frequency bin.