Дослідження точності теоретичних методів визначення спектрів сигналів при здійсненні низькочастотної модуляції

Abstract

Запропоновано метод визначення спектрів сигналів при здійсненні низькочастотної модуляції. За допомогою відомих і запропонованих методів визначення спектрів досліджено сигнали при здійсненні низькочастотної модуляції. Показано, що запропонований метод забезпечує високу точність і зменшення часу дослідження при визначенні спектрів таких сигналів порівняно з відомими методами визначення спектрів сигналів. The varieties of signal modulation, that apply in the modern telecommunication systems and networks, was described. The descriptions of spectrums of signals was considered. The known methods of calculation of the spectral descriptions of signals in case of use of baseband modulation was lead. The new offer analytical method of calculation of spectral descriptions of modulating signals, that used during realization of different kinds of manipulation of carrier, was described. This method can be used for the calculation of spectrums of signals in case of use of baseband modulation and spectrums of modulating signals as a K rectangular pulses string, that use during realization of different kinds of manipulation of carrier. The spectrums of signals during realization of baseband modulation by means of known and offer methods of signal spectrum calculation was explored. The graphic representations of spectrums of signals in case of application of explored methods of signal spectrum calculation was got. The defects of known methods of research of spectrums of signals was shown. As a result of researches it exposed, that in case of calculation of power spectrums of signals during realization of baseband modulation among the consider methods an offer analytical method of calculation of spectral descriptions of modulating signals, that used during realization of different kinds of manipulation of carrier, is the most expedient to application. The use of this method secures absence of error of calculations at the minimum necessary time of calculations in comparison with the known methods of signal spectrum calculation.