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UDC 621.396

ANALYSIS OF COGNITIVE RADIO SYSTEMS CHARACTERISTICS ADAPTING TO NARROW-BAND INTERFERENCE EFFECT BASED ON SYNTHESIZED FOUR-POSITION RADIO SIGNALS

A. A. Lisnichuk, Ph.D. (Tech.), associate professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
S. N. Kirillov, Dr. Sc. (Tech.), full professor, Head of the Department, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

The aim is to analyze the characteristics of cognitive radio systems that perform multi-criteria synthesis of four-position radio signals for adapting to the action of narrow-band interference with different parameters. The analysis of cognitive radio systems characteristics adapting to narrow-band interference effect was carried out. In these systems, multi-criteria synthesis of radio signals is realized, taking into account the following quality indicators: noise immunity to the action of narrow-band interference and additive «white» Gaussian noise (AWGN); peak-factor (energy efficiency of signals) and the level of out-of-band radiation. The quality indices of cognitive radio systems adapting to narrow-band interference change are determined. Cognitive radio systems adapting to the most unfavorable (of the considered) narrow-band interference effect (central frequency was equal to carrier wave frequency of useful signal; spectrum width was 5 %) provide noise immunity at the same level as QPSK signal under the influence of only AWGN up to relation signal-interference -7 dB. The radio systems without adaptation using known modulation types are inferior at this quality indicator up to 27 dB.

Key words: multi-criteria synthesis of radio signal, cognitive radio system, multi-criteria optimization, noise immunity increase.

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