Методи демодуляції частотно-маніпульованих сигналів з циклічно змінюваним індексом модуляції

Abstract

In this master's qualification thesis the main methods of demodulation of the frequency manipulated signals with a continuous phase with cyclically changing modulation index are considered. The analysis of theoretical provisions of optimum and suboptimal methods demodulation of this type signals is carried out. Operation of incoherent and coherent demodulators which I carry out reception of a signal with continuous phase frequency manipulation is investigated, methods and ways of increase of their noise stability and power efficiency are considered. For the incoherent demodulator of a signal research of symbol-by-symbol detecting, the received estimates of potentially achievable power loss to the coherent demodulator was conducted. The method of coherent reception of signals was considered from the point of view of the existing and perspective methods analysis of synchronization, comparative analysis from the point of an optimality view is carried out them. On the basis of a demodulation method with use of the frequency detecting demodulator scheme of the continuous phase frequency manipulated signal with two indexes of modulation is considered. Comparison of qualitative characteristics of demodulation methods of the continuous phase frequency manipulated signal with cyclically changeable index of modulation was carried out by means of numerical modeling in a package for engineering and applied problems MATLAB.