The topic of this paper covers the field of unmanned aerial vehicles and the communication between the aircraft itself and the GCS. In addition to making the theoretical part of the paper, the OFDM technique was simulated using the MATLAB computer environment. A historical overview and a description of the basic system of the drone is an overture to a more complete understanding of the communication system of the aircraft itself. Various data links from the UAV to the GCS and computer software for observing telemetry data are described. With further elaboration, the paper follows the dynamics of the development of the communication system and the necessary modulations for the transmission of the digital signal. After considering digital modulations, the emphasis is on the OFDM technique and its detailed analysis. Within the analysis, the signal modulation procedure is explained and the final scheme of the OFDM system is shown. The practical part of the work is the development of the MATLAB simulation of the OFDM communication system. Different variations of OFDM using QAM, BPSK and QPSK modulations have been observed where it is concluded that the use of OFDM with QPSK is useful for link transmission to short values, while for longer distances the application of OFDM with BPSK modulation is more suitable. The above modulations for the AWGN and Rayleigh channels are also observed.