This article presents a comprehensive study of the potential utilization of the L-band and S-band frequency ranges for satellite non-terrestrial network (NTN) technologies. This study encompasses an interference analysis in the S-band, investigating the coexistence of NTN satellite systems with mobile satellite networks such as Omnispace and Lyra, and an interference analysis in the L-band between NTN satellites and the mobile satellite network Inmarsat. This study simulates an NTN satellite network with typical characteristics defined by 3GPP and ITU-R for the n255 and n256 bands. Furthermore, it provides calculations illustrating the signal-to-noise ratio degradation of low-Earth-orbit (LEO), medium-Earth-orbit (MEO), and geostationary-Earth-orbit (GEO) satellite networks operating in the L-band and S-band when exposed to interference from NTN satellites.

RedCap technology is set to become a critical component in the growth of the Internet of Things (IoT), enabling sensors and wearable devices for medical, industrial, and commercial applications. However, because RedCap primarily operates in non-public networks and does not synchronize its time-division duplexing (TDD) mode with 5G NR networks, interference risks arise. This is particularly concerning as traditional 5G NR networks prioritize downlink communication, whereas RedCap is designed for uplink. This study investigates the potential interference between RedCap non-public networks and 5G NR in TDD FR1 and FR2 frequency bands using Monte Carlo simulation techniques. The results illustrate how RedCap deployments may impact 5G NR performance in urban and suburban environments. Key insights are provided to inform strategies for minimizing interference and ensuring coexistence between these technologies.

The problem of accuracy and reliability of measurement results of on-board measuring radio-electronic equipment is considered. The analysis of the accuracy of the measurement of the range by a radio frequency range station placed on a mobile object under the influence of interference is carried out. We show that there is a nonlinearly increasing dynamic error if the optimal filter was constructed without taking into consideration of the elements nonideality. So precision of distance measurement of mobile radio-range station depends on the interference. This example emphasizes the importance of the quality problem of components used in onboard equipment and establishing tolerances for component parameters.

Increasing the efficiency of transmitters, as the largest consumers of energy, is relevant for any wireless communication devices. For higher efficiency, a number of methods are used, including envelope tracking and envelope elimination and restoration. Increasing the bandwidth of used frequencies requires expanding envelope modulators bandwidth up to 250–500 MHz or more. The possibility of using amplifiers with input signal quantization (AISQ), as an alternative to the most common hybrid envelope tracking modulators, is considered. An approach has been developed for optimizing AISQ characteristics according to the criterion of minimum loss when amplifying modern telecommunication signals with Rayleigh envelope distribution. The optimal quantization levels are determined and the energy characteristics of AISQ are calculated. AISQ loss power is shown to decrease by 1.66 times with two-level quantization, by 2.4 times with three-level quantization, and by a factor of 3.0–3.7 for four–five quantization levels compared to a class B amplifier. With these parameters, AISQ becomes competitive with respect to hybrid envelope tracking modulators but does not have electromagnetic interference from the pulse width modulation (PWM) path.

The Digital Radio Mondiale (DRM) broadcasting standard is the only ITU approved for worldwide application in the frequency range below 30 MHz. The DRM standard provides the use of single-frequency synchronous broadcasting networks. Their application with competent frequency-territorial planning allows to increase the efficiency of the DRM broadcasting networks, as well as to save the frequency resource. The DRM single-frequency synchronous networks construction in general differs from the DVB-T/DVB-T2 synchronous digital television networks or VHF DAB/DAB + digital broadcasting networks construction due in the presence of ionospheric propagation of radio waves. These features are considered in this article. Method for calculating the synchronism zone is proposed. Consideration of possible scenarios for the placement of transmitters showed that the most advantageous can be considered their placement at an angle of 90 degrees. Tests of single frequency DRM radio network in the SW range with original methodology were conducted. Measurement results show that synchronous network gain reached the values up to 6 dB at a wire antenna and up to 11 dB at a whip antenna. When using traditional for broadcasting “day” and “night” frequencies it is possible to provide broadcast quality with high reliability (i.e., 98% audio decoding) within 24 hours.