A.R. Bestugin1, S.V. Dvornikov2, S.S. Dvornikov3, I.A. Kirshina4, N.A. Ovchinnikova5

1–5 Saint Petersburg State University of Aerospace Instrumentation (SUAI) (St. Petersburg, Russia)

2,3 Military Academy of Communications named after Marshal of the Soviet Union S.M. Budyonny
(St. Petersburg, Russia)

1 fresguap@mail.ru, 2 practicdsv@yandex.ru, 3 dvornic92@mail.ru, 4 ikirshina@mail.ru, 5 NA_Ovchinnikova@guap.ru

The simplicity of synthesis of amplitude manipulation signals has ensured their wide application in optical communication channels. In particular, signals based on binary coding, named in scientific circles as two-position manipulation, are actively used in open optical channels. Two-position manipulation signals are more spectrally efficient than amplitude manipulation signals.  The frequency bandwidth occupied by them is comparable to the bandwidth required for transmission of binary phase manipulation signals at the same information rate.

At the same time communication systems based on binary phase manipulation are more sensitive to channel noise than the systems using amplitude manipulation, therefore the development of demodulators allowing to increase the reliability of their reception seems to be an urgent issue. To develop a demodulator of two-position manipulation signals in fading channels.

Technical features of synthesis of signals of this class are analysed. Their temporal and spectral structure, as well as general approaches to their demodulation are considered. The influence of fading channels on the reliability of reception is shown. The structure of demodulator of signals of two-position manipulation, providing realisation of adaptive threshold of decision making is proved. Its work is considered. The results of estimation of reception noise immunity on the basis of the proposed demodulator, obtained in the course of modelling, are given.

The obtained results have shown the effectiveness of the proposed approach to the selection of the decision threshold for demodulation of signals two-position manipulation in channels with fading. Obviously, in practice, the intensity of fading can be much higher. However, at this stage of the study the problem was to justify the very principle of adaptation under conditions of a priori uncertainty about the parameters of the channel with fading.

Bestugin A.R., Dvornikov S.V., Dvornikov S.S., Kirshina I.A., Ovchinnikova N.A. Demodulator of on-off keying signals in a fading channel. Achievements of modern radioelectronics. 2023. V. 77. № 11. P. 37–43. DOI: https://doi.org/10.18127/j20700784-202311-02 [in Russian]

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