A.S. Orlova1, S.B. Makarov2, S.V. Zavjalov3, I. Lavrenyuk4, S.V. Tomashevich5

1-5 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

1 ovsyannikova_as@spbstu.ru; 2 makarov@cee.spbstu.ru; 3 zavyalov_sv@spbstu.ru;
4 lavrenyuk_i@spbstu.ru; 5 tomashevich.s.v@sut.ru

Formulation of the problem. Ensuring high noise immunity of signal reception in rooms containing a large number of metal surfaces, structures and equipment (industrial scenario) is difficult due to multipath signal propagation. The efficiency of using classical waveforms with rectangular amplitude modulation pulses in these data transmission conditions is significantly reduced. It seems promising to use signals in which the shape of the modulation amplitude pulse has a pronounced bell-shaped appearance. This property will reduce the effect of distortion of the modulation symbol during multipath propagation and thereby increase the noise immunity of reception. Such signals include spectrally efficient signals, the duration of which exceeds the symbol duration, in particular, signals based on RRC pulses.

The goal is to determine the error vector magnitude in industrial scenario for an original room model with multipath propagation of spectrally efficient signals with a compact spectrum.

Results. It is shown that the transition to using signals with a smoothed amplitude pulse shape leads to a narrowing of the range and a decrease in peak EVM values. This is due to the fact that the pulse peak becomes narrower and introduces a lower level of intersymbol interference in conditions of multipath propagation. It is shown that in the case of using signals based on RRC pulses, which allow for an increase in spectral efficiency, the best results are achieved when using an MLSE equalizer with
EVM = 0,5% at all points of the room.

Practical significance. It is shown that in the considered industrial scenario, when using BPSK modulation, a data transfer rate of about 3,5 Mb/s can be provided, which meets the requirements for industrial sensors and video surveillance modules in low resolution.

Orlova A.S., Makarov S.B., Zavjalov S.V., Lavrenyuk I., Tomashevich S.V. Estimation of the error vector magnitude in an industrial
data transmission scenario under conditions of multipath propagation of spectrally efficient signals. Radiotekhnika. 2025. V. 89. № 3. P. 74−89. DOI: https://doi.org/10.18127/j00338486-202503-07 (In Russian)

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