Однополосно модулированный сигнал с контролированным уровнем остатка несущей

Abstract

An approach to the formation of single-sideband modulation signals based on quadrature synthesis is considered. The relevance of the use of single-sideband modulation signals for decameter radio communication systems is demonstrated. The analytical generality of the signals of amplitude and single-sideband modulation is shown in the transition to the analytical form of their representation. An analysis of the known methods for generating signals of single-sideband modulation with a suppressed carrier has been carried out. Their advantages and disadvantages are shown. The structural commonality of amplitude modulation signals and single-sideband modulation signals with a preserved carrier wave is demonstrated. The introduction of an additional parameter is justified, which makes it possible to adjust the level of the stored pilot signal in single-sideband modulation signals. The developed analytical model of the single-sideband modulation signal is presented, in which, unlike the known models, the pilot signal level can be adjusted at the stage of its formation. The results obtained open up new possibilities for redistributing the output power between the pilot signal and sideband information components depending on the level of interference in the channel. It is shown that the developed approach based on quadrature synthesis makes it possible to form single-sideband modulation signals with a stored pilot signal without additional filtering procedures. The gain in noise immunity of reception during the transition from amplitude modulation to single-sideband is demonstrated. A block diagram of the formation of single-sideband modulation signals with a given pilot signal level has been developed. The results of analytical modeling are demonstrated.