Analog modulation system is a communication system, one of the main links. The so-called modulation, is converted into signals suitable for transmission in the form of channels of a process. Modulated carrier signal and in accordance with the different, the corresponding modulation into analog modulation, digital modulation, analog and digital pulse modulation such as pulse modulation. Analog modulation is divided into linear and nonlinear modulation modulation. In this paper, a simulation system modulation DSB, AM, SSB, VSB, FM, PM modulation and demodulation of basic methods, the use of graphics and fringe SystemView simulation tool - for analog modulation system in the simulation, based on input and output of the waveform analysis the modulation performance of the system (respectively, channel analysis are two kinds of noise and noise-free situation) and then, through simulation, modulation and demodulation process of observing the various aspects of time domain and frequency domain waveforms, and modulation method of combining these types of modulation principle analyzed and compared the performance of various modulation methods.
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