S.V. Dvornikov – Dr.Sc.(Eng.), Professor, 

Department of Telecommunication, S.M. Budjonny Military Academy of Signal Corps (Saint Petersburg) E-mail: practicdsv@yandex.ru

E.A. Popov – Ph.D.(Eng.), Associate Professor, 

Higher School of Applied Physics and Space Technologies of Peter The Great St. Petersburg Polytechnic University E-mail: popov@spbstu.ru

A.A. Balykov – Post-graduate Student, 

Department of Telecommunication, S.M. Budjonny Military Academy of Signal Corps (Saint Petersburg) E-mail: etomoiadres@mail.ru

S.S. Dvornikov – Ph.D.(Eng.), Head of Department, 

S.M. Budjonny Military Academy of Signal Corps (Saint Petersburg) E-mail: dvornik.92@mail.ru

The complex signal-noise environment in the decameter wavelength range stimulates the search for new types of signals that can increase the transmission speed with little loss in noise immunity. Of interest is the use of signals with permutation frequency modulation (FFM).

The article presents an analytical approach to calculating the noise immunity of signals with permutation frequency modulation in which the current choice of combination of tone oscillations is determined by a constant weight code. An analytical expression is obtained for calculating the probability of error under incoherent reception in channels with constant parameters. The results of a comparative analysis of the noise immunity of the permutation frequency modulation and multi-position frequency modulation signals are carried out. Graphs of the dependence of the probability of bit error on the ratio of bit energy to spectral density of noise power are presented. Practical significance. The results obtained make it possible to consider IFM signals as an alternative solution to signals with orthogonal frequency multiplexing used in ionospheric radio channels in order to combat intersymbol interference.

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