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The three most basic modulation methods for digital signals (amplitude modulation, frequency modulation, and phase modulation) are abbreviated as ASK, FSK, and PSK. Various other modulation methods are improvements or combinations of the above methods. For example, quadrature amplitude modulation QAM is amplitude modulation and Phase modulation combination; MSK is an improvement of FSK; GMSK is an improvement of MSK that inserts a Gaussian low-pass pre-modulation filter before the MSK (Minimum Shift Keying) modulator to improve spectrum efficiency and communication. Quality; OFDM can be seen as a modulation method for multiple carriers.
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The modulation method is to guarantee the communication effect and to overcome the problems in the long-distance signal transmission, it is necessary to transfer the signal spectrum to the high-frequency channel through modulation. The process of loading the signal to be sent to the high-frequency signal is called modulation. In practical applications, there are usually three basic modulation methods, whether analog or digital, modulation, frequency modulation, and phase modulation.