S.N. Kirillov – Dr.Sc.(Eng.), Professor, Head of Department «Radio Control and Communications»,  Ryazan State Radio Engineering University named after V.F. Utkin

E-mail: kirillov.lab@gmail.com

A.A. Lisnichuk – Ph.D.(Eng.), Associate Professor, 

Department «Radio Control and Communications», Ryazan State Radio Engineering University named after V.F. Utkin E-mail: a.a.lisnichuk@gmail.com

Problem statement: in order to increase the interference immunity and hidden of DSSS radio communication systems, it is advisable to minimize the spectrum level at interference frequencies and also form «spikes» in power spectral density (PSD), corresponding to characteristics (band, shape, etc.) of narrow-band signals. Thus, it is possible, on the one hand, to reduce the radiated power by additionally minimizing the narrow-band interference (NI) effect, and, on the other hand, to increase energy secrecy under the condition of the most probable behavior of radio monitoring systems, under conditions of high a priori uncertainty, when detecting DSSS radio signals by background of narrow-band interference (i.e., notch filtering NI).

Purpose: development of multi-criteria synthesis procedure of DSSS signals to increase interference immunity and energy secrecy of cognitive radio communication systems.

Results: the probability of correct detection for synthesized DSSS signal with «spike» of PSD, which by its characteristics can be determined by the radio monitoring system as a narrow-band signal (without DSSS), is higher (by up to 0.08 at Eb/N0 =19 dB) compared with the probability of detecting the rest of the synthesized radio signal after notch filtering.

Practical relevance: the results obtained indicate the advisability of using a class of synthesized DSSS radio signals to increase interference immunity and energy secrecy, provided that the most likely behavior of radio monitoring systems under the influence of narrow-band interference.

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