The replacement of mobile wireless communication technology has become an indispensable necessity for our life, study and entertainment. From 1G to 5G, what stages have we experienced? Let’s take a look! 1G In 1986, the first mobile communication system was born in Chicago, USA, using analog signal transmission, and the analog type represented the use of analog FM modulation in wireless transmission. The main system of 1G is AMPS, in addition to NMT and TACS, there are points of A network and B network. The big "big brother" is all the rage. 2G Compared with 1G networks that can only be applied to general voice transmission, with low voice quality, unstable signals, and insufficient coverage, the second generation mobile communication has a high degree of confidentiality, and the system capacity is also increasing. The first generation of mobile phones can also access the Internet. With the birth of 2G, the competition for mobile communication standards has begun. GSM in the mainstream of 2G: Global System for Mobile CommunicaTIon is the most widely used mobile phone standard. The biggest difference between the previous standards is that its signaling and voice channels are digital. of. TDMA: Time Division Multiple Access (TImeDivision MulTIple Access) divides time into periodic frames. Each frame is divided into several time slots to send signals to the base station. Under the condition of satisfying timing and synchronization, the base station The signals of the mobile terminals can be received in each time slot without confusion. 3G As people's demand for mobile networks continues to increase, the third generation of mobile communication networks has opened a new era of mobile communications. The high frequency and stable transmission of 3G networks makes video telephony and large amounts of data transmission more common. Among them, CDMA is the technical basis of the third generation mobile communication system. The CDMA system shows great development potential due to its simple frequency planning, large system capacity, high frequency reuse coefficient, strong anti-multipath capability, good communication quality, soft capacity and soft handover. 4G The 4G wireless cellular phone protocol is a technology product that integrates 3G and WLAN and can transmit high-quality video images and image transmission quality comparable to that of high-definition television. The 4G system can download at 100Mbps, which is 2000 times faster than dial-up Internet access, and the upload speed can reach 20Mbps. 4G's main network standard LTE is a global standard based on OFDMA technology and developed by the 3GPP organization, including TDD (Time Division Duplex) and FDD (Frequency Division Duplex). The similarity is 90%, and the difference is small. . smart touch screen whiteboard for meeting room and classroom,smart Interactive Whiteboard for conference video system and teaching; smart board,smart interactive flat panel,smart touch screen interactive,smart interactive whiteboard Jumei Video(Shenzhen)Co.,Ltd , https://www.jmsxdisplay.com![[Popular] Mobile wireless communication technology 1G to 5G road](http://i.bosscdn.com/blog/21/60/27/5-160513113K3645.png)