M.A. Romashchenko1, N.V. Astahov2, D.V. Vasil’chenko3, R.S. Sukhomlinov4

1-4 FSBEI of HE “Voronezh State Technical University” (Voronezh, Russia)

1 kipr@vorstu.ru; 2 kipr@vorstu.ru; 3 shadow951@bk.ru; 4 sukhomlinov03@mail.ru

Formulation of the problem. With the development of wireless technologies and telecommunication systems, the number of devices operating in the same radio frequency range increases. In this regard, the density of the radio frequency spectrum increases and the probability of mutual interference arises. Interference manifests itself in the form of signal overlapping, which can lead to distortion of transmitted data and a decrease in the speed of information exchange. In this regard, it becomes necessary to correctly configure the signal modulation parameters, which directly affect the noise immunity of the communication channel.

Purpose. Study of the influence of data packet length and the encoding rate of the transmitted signal on the noise immunity of the LoRa communication channel.

Results. The analysis of the obtained data revealed several patterns. At a coding rate of CR = 4/5, the number of reception errors is higher compared to greater CR values. For example, at CR = 4/8, the signal remains stable at an SNR level that is 2 dB lower than at CR = 4/5. This indicates that increasing the coding rate improves data transmission resilience to interference but requires more time for information processing. It was also established that longer data packets are more susceptible to interference, increasing the likelihood of data loss. However, increasing the spreading factor (SF) helps mitigate this issue, albeit at the cost of reduced packet transmission speed.

Practical significance. The results of the experiment coincide with the noise immunity data from the technical documentation for the LoRa SX1276 modules, which proves its reliability. In the future, when constructing communication channels, it is planned to develop an adequate model of the LoRa channel in the GNU Radio simulation environment. After confirming its compliance with real hardware modules, it is supposed to proceed to conducting experiments in a simulation environment without using hardware, which will allow effectively investigating the influence of modulation parameters on the noise immunity of the communication channel.

Romashchenko M.A., Astahov N.V., Vasil’chenko D.V., Sukhomlinov R.S. Evaluation of the influence of LoRa modulation parameters on the stability of the communication channel to interference. Radiotekhnika. 2025. V. 89. № 7. P. 31−36. DOI: https://doi.org/10.18127/j00338486-202507-06 (In Russian)

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