O.V. Chernoyarov1, A.N. Glushkov2, Kaung Myat San3, V.P. Litvinenko4, Y.V. Litvinenko5

1,3 National Research University “MPEI” (Moscow, Russia)

1 National Research Tomsk State University (Tomsk, Russia)

2 Zhukovsky-Gagarin Air Force Academy (Voronezh, Russia)

4,5 Voronezh State Technical University (Voronezh, Russia)

1 chernoyarovov@mpei.ru, 2 al.nk.glushkov@gmail.com, 3 kmyatsan@mail.ru, 4 vl.pt.litvinenko@gmail.com, 5 yu.vl.litvinenko@gmail.com

The task of measuring the signal-to-noise ratio in a working discrete communication channel when transmitting multi-level phase- or frequency-shift keyed signals without distorting the communication system operation is quite relevant, especially if it does not require significant computational costs. To solve it, it is proposed to use the statistical properties of a sampling of the values of the logarithm of the ratio of the amplitudes of the adjacent (current and previous) information symbols at the moment of the end of their reception. It is shown that in the channel with Gaussian noise, these properties are determined by the signal-to-noise ratio only and do not depend on the absolute levels of both signal and noise. Two algorithms for processing sample elements are introduced based on estimating their variance or frequency of exceeding a specified threshold. The necessary calculation ratios are obtained, a statistical simulation of the algorithms for estimating the channel signal-to-noise ratio when receiving a phase-shift keyed signal is carried out, and their accuracy characteristics are found. It is established that the proposed algorithms make it possible to measure the signal-to-noise ratio with the required accuracy at an appropriate sample size. The results of the study can be used both in the design and operation of digital information transmission equipment.

Chernoyarov O.V., Glushkov A.N., Kaung Myat San, Litvinenko V.P., Litvinenko Y.V. Measuring the signal-to-noise ratio in a discrete communication channel. Radiotekhnika. 2023. V. 87. № 10. P. 5−56. DOI: https://doi.org/10.18127/j00338486-202310-00 (In Russian)

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