Patent ID: 8340582
Filing Date: 2012-12-25
Classification: H04B,H04L

Abstract:
1. A method of distinguishing center-frequency-tuned signals from off-tuned signals and noise in a single-channel receiver, comprising the following steps: a. receiving a signal with the single-channel receiver and transforming the signal into an output signal; b. storing the output signal as a series of data points in a memory store; c. calculating the variance of a time-windowed segment of the stored output signal, wherein the variance equals the second central moment of the segment; d. storing data representing the variance of the segment in the memory store; e. calculating the kurtosis of the segment of the output signal, wherein the kurtosis equals the ratio of the fourth central moment to the variance squared minus three; f. storing data representing the kurtosis of the segment in the memory store; g. comparing the variance data and the kurtosis data to variance and kurtosis thresholds respectively; h. identifying the segment as center-frequency-tuned if the variance of the segment exceeds the variance threshold and the kurtosis falls below the kurtosis threshold; and i. identifying the segment as non-center-frequency-tuned if the variance of the segment is less than or equal to the variance threshold and/or the kurtosis is greater than or equal to the kurtosis threshold.