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Brief classification knowledge of wireless communication system

Author: Shenzhen Science and technology time: September 4, 2019 source: egibl.com
Abstract: wireless communication system can be classified according to the transmission signal form, wireless terminal status, electromagnetic wave length, transmission mode and communication distance. Today, let's first look at the first three. 1. According to the form of transmission signal, it is divided into

Wireless communication system can be classified according to transmission signal form, wireless terminal status, electromagnetic wave length, transmission mode and communication distance. Today, let's first look at the first three.

1. According to the types of transmission signals, wireless communication systems can be divided into analog wireless communication systems and digital wireless communication systems.

(1) analog wireless communication system: analog wireless communication system transmits the collected signals directly, and transmits analog signals. (2) Digital wireless communication system: digital wireless communication system transforms the collected signal into digital signal and then transmits it. The transmitted signal only includes digital 0 and 1. Digital wireless communication system is gradually replacing analog wireless communication system.

2. According to the classification of wireless terminal status, wireless communication system can be divided into fixed wireless communication system and mobile wireless communication system.

(1) fixed wireless communication system: the terminal equipment of fixed wireless communication system is fixed, such as fixed telephone communication system. (2) Mobile wireless communication system: the terminal equipment of mobile wireless communication system is mobile, such as mobile phone communication system.

3. According to the classification of electromagnetic wave length, the wireless communication system can be divided into long wave wireless communication system, medium wave wireless communication system, short wave wireless communication system, ultra short wave wireless communication system, microwave wireless communication system, etc.

      (1) Long wave wireless communication system: long wave wireless communication system refers to the radio communication using electromagnetic wave with wavelength greater than 1000m and frequency lower than 300kHz, also known as low-frequency communication. It can be divided into long wave (wavelength of 1-10km, frequency of 30-300khz), very long wave (wavelength of 10-100km, frequency of 3-30khz), ultra-long wave (wavelength of 100-1000km, frequency of 300) Communication in the frequency range of 3-30hz, ultra long wave (wavelength: 1000-10000km, frequency: 30-300hz) and ultra-long wave (wavelength: 10000-100000km, frequency: 3-30hz).

(2) medium wave wireless communication system: medium wave wireless communication system refers to the radio communication using electromagnetic wave with wavelength of 100-1000m and frequency of 300-3000khz. (3) Short wave wireless communication system: short wave wireless communication system refers to the radio communication using electromagnetic wave with wavelength of 10-100m and frequency of 3-30MHz.

Ultra short wave (VHF) refers to the radio communication system with ultra short wave length of 1-300mhz.

      (5) Microwave wireless communication system: microwave wireless communication system refers to the radio communication by using electromagnetic waves with wavelength less than 1m and frequency higher than 300MHz. It can be subdivided into decimeter wave (wavelength of 100-1000mm, frequency of 300-3000mhz), centimeter wave (wavelength of 10-100mm, frequency of 3-30ghz), millimeter wave (wavelength of 1-10mm, frequency of 30-300ghz) and nanometre wave (wavelength is 0.1-1 mm, frequency is 300-3000 GHz) band communication.

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