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V2X Communication SystemsCommunication between vehicles and vehicles and infrastructure (V2X) which is one of the significant topics of 5G development, is a subject of investigations in the Institute. Part of the research was performed in the framework of cooperation with Nokia Solutions and Networks. The research team investigated traffic safety, meant as the minimization of vehicle collision probability, in the case of vehicle platoons (convoys) when a wireless communication system (e.g., IEEE 802.11p) is applied within a moving platoon. The team considered vehicle control algorithms ensuring reliability and string stability from the system theory point of view. The next research topic is lengthening the vehicle platoon by applying so-called virtual communication leaders. Subsequent research topics are related to radio resource management algorithms aiming at the minimization of packet collision probability by applying Mode 3 and 4 LTE system specialized in V2X communications. Recent investigations focus on databases and edge intelligence to support dynamic spectrum access for vehicle platooning.Unmanned Aerial Vehicle CommunicationsResearch related to communication with unmanned aerial vehicles (UAV) concentrate on air to ground radio channel modeling for both long-range (LOS/NLOS) and mediumrange (LOS) UAV communication systems, physical layer solutions for control and telemetry radio links with high reliability and high-speed data links, as well as energyefficient solutions for UAV communications. Original synchronization, modulation/demodulation and channel coding/decoding methods and algorithms are developed and investigated for the physical layer of UAV communication systems. The selected solutions are implemented using the Software Defined Radio (SDR) technique.