5G is only one of the communication categories. The whole communication system is composed of source, transmitting equipment, channel, noise source, receiving equipment, sink, etc., so as to achieve the purpose of information transmission. Communication by transmission medium includes wired communication and wireless communication; According to the working frequency band, it is divided into long wave communication, medium wave communication, short wave communication and microwave communication; According to the modulation mode, it can be divided into baseband transmission and band transmission.

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