US 11,870,618 B2 · Data processing for automatic modulation classification of wireless signals

Abstract

Systems and methods for classifying a modulation scheme of a wireless signal are described. In some embodiments, a system receives a wireless signal modulated based on a modulation scheme having a constant modulus. The system can generate a resampled signal from the wireless signal based on features extracted from the wireless signal and perform blind equalization on the resampled signal based on a constant modulus criterion to generate an equalized signal. Then, the system can cause a modulation classifier to classify the received wireless signal to a modulation scheme from a plurality of predetermined modulation schemes based on the equalized signal. By preconditioning the wireless signal to reduce feature variability imparted by a propagation channel onto the wireless signal, the system can increase the classification accuracy of the modulation classifier.

Claims26

Dependent claims

A method for classifying a modulation scheme of a wireless signal, comprising:

receiving a modulated wireless signal;
estimating a center frequency of the wireless signal;
estimating a bandwidth of the wireless signal;
generating a resampled signal from the received modulated wireless signal wherein a rate of the resampled signal is based on the estimated center frequency and the estimated bandwidth of the wireless signal, wherein generating a resampled signal from the wireless signal comprises performing blind equalization in an iterative manner, and wherein during each iteration, the resampled signal is convolved with a plurality of equalization taps and a convolved signal envelope is used to determine whether to adjust a plurality of equalization weights;
and
classifying the received wireless signal using a modulation classifier to a modulation scheme based on the resampled signal.

3 more elements

Dependencies are inferred from the claim text.

Data processing for automatic modulation classification of wireless signals

Life of this patent

Data processing for automatic modulation classification of wireless signals

Life of this patent

Abstract

Claims26