Patent ID: 8532207

Claim:
A method for distinguishing a signal of interest from one or more interference signals in a received analog signal, the method comprising: receiving an analog signal at a radio front end; transmitting the received analog signal to an analog-to-digital converter to sample data in the received analog signal and output a digital signal; performing a sub-channel fast Fourier transform (FFT) on the digital signal; averaging sub-channel FFT bin magnitudes over a set period of time to determine a shape of the received signal; and comparing the shape of the received signal to one or more signal reference patterns by a method comprising: (a) normalizing the shape of the received signal; (b) selecting a next signal reference pattern; (c) normalizing the next signal reference pattern; (d) computing a bias correction factor for the normalized received signal and the normalized signal reference pattern; (e) computing a metric for comparing the shape of the normalized received signal with the normalized signal reference pattern; (f) determining whether one or more different signal reference patterns are available; (g) if one or more different signal reference patterns are available, repeating (b) to (f) until a metric has been computed for each of the signal reference patterns; and (h) determining whether each computed metric has passed a threshold requirement indicating that a signal of interest is present in the received signal.