Evaluation of opportunities of synthesis of the broken communication at creation of combined digital synchronous-­phase demodulator of modern system telecommunications

The effectiveness of modern radio communications directly depends on the quality of use of individual devices and subsystems of their composition. Such spaces include, in particular, tracking demodulators of frequency-modulated and phase-modulated signals. The task of improving the accuracy and speed of analog-digital SFDs is urgent. One of the directions of which can be the synthesis of digital open compensation communication directly in their synchronization subsystem, namely the construction of iterative analog-digital SFDs, provided that the main and auxiliary circuits of their synchronization systems can be both digital and analog. The issues of synthesis of open communication in subsystems of phase synchronization of digital synchronous phase demodulators of modern telecommunication systems are considered in the work. On the example of the selected scheme of construction of a digital synchronous phase demodulator, the synthesis of an open compensation connection in its construction structure for a steady state operation is performed. The obtained and presented functional dependences of the transfer function of the synchronous-phase demodulator with open communication allow to ensure the order of astatism of the system is 2. Analysis of the obtained transfer function showed that it can be implemented on microprocessors and has the ability to pre-analyze it on a computer without operations of integration and approximate calculation of transition matrices. A further direction of research initiated in this work is the synthesis of open coupling in synchronous-phase demodulators with a higher order of astatism against the background of additive Gaussian noise, taking into account the phase instability of the generators.