METHOD OF MEASURING SIGNAL-TO-NOISE RATIO OF SIGNALS WITH ANGULAR KEYING Russian patent published in 2024 - IPC G01R29/26 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used in systems for transmitting discrete information to determine the signal-to-noise ratio and estimate the quality of a communication channel with angular (frequency or phase) keying without introducing additional redundancy into transmitted signals. Received signal is converted to digital form, the amplitude of the current symbol is calculated from the obtained digital readings and the logarithm of the ratio of the amplitudes of the current and previous symbols is found, and the modulus of the found logarithm is calculated. Magnitude of the logarithm of the ratio of the amplitudes of the current and previous symbols is compared with the set threshold b and the number M of exceedances of this threshold in a sample of a given volume of N symbols is counted. Based on the known value of the threshold and the found estimate of the probability of its exceeding, the result of measuring the signal-to-noise ratio h² is formed using the inverse transformation h²=F⁻¹(N,M,b) from ratios, , where w(x) is symbol amplitude probability density.

EFFECT: reduced error in measuring signal-to-noise ratio greater than 10.

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