MULTI-CRITERIA SYNTHESIS PROCEDURE OF OFDM-SIGNALS TO INCREASE ENERGY EFFICIENCY AND STRUCTURAL HIDING OF COMMUNICATION RADIO SYSTEMS

Abstract

For widely used in practice communication radio systems based on OFDM signals, the known disadvantages are both a high value of PAPR (leading to a decrease in energy efficiency) and a rela-tively low structural hiding of modulation types. The work aim is to develop a procedure for multi-criteria synthesis of multi-position OFDM radio signals to increase the energy efficiency and structur-al hiding of communication radio systems. At the first stage, the combined quality criterion includes particular criteria that are responsible for increasing the noise immunity to additive «white» Gaussian noise and ensuring the maximization of the structural hiding of the generated signal. The application of the last criterion in radio monitoring systems led to a significant increase in bit error rate from the set of detectors for the known types of signals (up to values of more than 30 %). The proposed two-stage procedure for multi-criteria synthesis of OFDM radio signals additionally provides a gain in energy efficiency (according to the CCDF level ) by more than 0.9 dB and 6.6 dB, respective-ly, compared to the case of using the known reducing PAPR technique PTS (Partial transmit sequence) and without using any method to improve the energy efficiency of OFDM signals.