Implementation of an Algorithm for Intelligent Tuning of Operating Frequencies for Cognitive Radio Systems

This article discusses the issues of practical implementation of the previously developed algorithms for intelligent tuning of operating frequencies in cognitive radio systems. Two SDR devices of the LimeSDR type were used as a model of the cognitive radio system. An OFDM signal with an adaptive signal-code structure is used as a system signal. Service information about the parameters of the signal-code structure and the number of the frequency channel of the next frame is transmitted in the pilot signal subcarriers. To implement the algorithm, special software has been developed. Experimental studies were carried out with the use of software, where it was shown that the use of an algorithm for predicting the occupancy of frequency channels can reduce the time of operational scanning of the spectrum.