Methods of determining the signal-to-noise ratio in radio communication systems

The issue of wireless transmission of information via radio communication is raised. It is indicated that the key parameter of the radio channel quality is the signal-to-noise ratio at the input of the receiving device. The importance of ensuring a high signal-to-noise ratio in radio transmitting and receiving devices and systems is emphasized. An analytical review and comparative analysis of common methods for determining the signal-to-noise ratio at the input of the receiving device is carried out. Theoretical and practical methods for determining the signal-to-noise ratio are considered, in particular, the method of complex envelope, the method of spectral analysis, as well as the method of calculating losses in free space. Their advantages and disadvantages are revealed. The mathematical and methodological apparatus of the considered methods is described. A brief description of the algorithms for measuring the signal-to-noise ratio in these methods is given. Information about the conducted experimental studies of the methods is provided. The initial data and the results of the experiment are described. The results of a comparative analysis of theoretical and practical methods are presented according to the criterion of accuracy in estimating the signal-to-noise ratio at the input of the receiving device. The main reasons and factors that reduce the accuracy of the theoretical assessment of the signal-to-noise ratio compared with the practical measurement are analyzed. Possible ways to increase the value of the signal-to-noise ratio in theoretical methods are proposed.

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