К.Yu. Lozhkin – Dr.Sc. (Eng.), Associate Professor, Head of Science and Technology Center,
MESC «Zhukovsky-Gagarin Air Force Academy» (Voronezh)
E-mail: K.Yu.Lozhkin@mail.ru
A.V. Petrov – Ph.D. (Eng.), Associate Professor,
MESC «Zhukovsky-Gagarin Air Force Academy» (Voronezh)
E-mail: andviktpetrov@yandex.ru
V.A. Mironov – Dr.Sc. (Eng.), Professor, Chief Research Scientist, MESC «Zhukovsky-Gagarin Air Force Academy» (Voronezh)
E-mail: mirvam@live.ru
V.V. Mikhalev – Post-graduate Student,
MESC «Zhukovsky-Gagarin Air Force Academy» (Voronezh)
E-mail: vajiepka@mail.ru
S. S. Prozhetorko – Post-graduate Student,
MESC «Zhukovsky-Gagarin Air Force Academy» (Voronezh) E-mail: Caspro@rambler.ru
Multiposition signals with quadrature amplitude modulation, having a rectangular signal constellation, are widely used in communication systems of various frequency ranges. For example, they are used in communications operating according to the NATO military standard MIL-STD-188-110C, designed to transmit information in the short-wavelength wavelength range, as well as in wide-range radio stations of the promising US Army radio system «JTRS».
However, studies of the reception efficiency of the considered signals under the influence of signal-like jamming are not comprehensive enough, since there is no assessment of their noise immunity against a background of continuous harmonic or phase-shift keying jamming in terms of the average probability of distortion of a binary element (bit) in the condition of signal fading and (or) jamming. Based on the statistical theory of communications using the constant parameter method, analytical dependences of the average bit distortion probability of a multi-position signal with quadrature amplitude modulation on the jamming-to-signal ratio for coherent element-wise reception against a background of harmonic or phase-shift keying jamming for all possible variants of signal fading and (or ) jamming.
According to the indicator in the form of the average probability of bit distortion of the signal under consideration, a comparative assessment of the noise immunity of its reception under the influence of harmonic or phase-shift keying jamming interference is performed.
The obtained analytical dependences of the average probability of bit distortion of a multi-position signal with quadrature amplitude modulation on the jamming-signal ratio with coherent element-wise reception against a background of time-continuous harmonic or phase-shift keying jamming with all kinds of fading options, can be used to justify the structures of the most unfavorable interference to information transmission channels at solving problems of destruction, protection of information or ensuring electromagnetic compatibility of a electronic means.
It is shown that in the presence of signal fading and (or) jamming, the dependence of the bit distortion probability of the considered signal is a monotonically increasing function of the jamming-signal ratio, in contrast to similar dependences for channels with constant parameters characterized by a threshold effect.
It was found that the noise immunity of receiving a multi-position signal with quadrature amplitude modulation under the influence of the considered interference decreases with increasing value of the number of positions for all possible combinations of signal fading and (or) jamming. The greatest noise immunity of the reception of the signal under consideration under the influence of harmonic or phase-shift keying jamming is observed in the presence of fading only jamming.
It was determined that the most unfavorable of the considered harmonic and phase-shift keying jamming is harmonic jamming, since at fixed values of the jamming-signal ratio it provides large values of the bit distortion probability of a multi-position signal with quadrature amplitude modulation.
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