Learning content.
Chapter 5 Wireless Communication Networks.
This chapter focuses on wireless communication network related technologies, including mobile communications, wireless LAN, wireless personal networks, and WiMAX wireless metro networks.
This chapter has 4 knowledge modules, a total of 9 knowledge points, and 12 courses**.
The main contents include:
5.1 Mobile Communications.
5.2 Wireless LAN
5.3 Wireless personal network.
5.4 Wireless metro.
Today's learning content.
5.1 Mobile Communications.
5.2 Wireless LAN
Common question types. 1. In 5G technology, the technology used to increase the number of access users is ( ).
a.mimo
b.n**c.soma
d.SDN Answer: A
Analysis]: MIMO can increase the bandwidth and the number of access users, SOMA (semi-orthogonal frequency division multiple access) is 4SDN is a software-defined network for 5G access technology, which separates the control plane from the data plane. n** is the abbreviation of the next generation of Internet of Vehicles.
2. The following IEEE802In the 11 series standard, the WLAN transmission rate reaches 300 Mbps ( ).
a. 802.11a
b. 802.11b
c. 802.11g
d. 802.11n
Answer: DAnalysis: Only 11N can reach 300Mbps
Learning Summary: China in 2The 4GHz band opens 13 free channels, which are stacked on top of each other.
Each channel has a bandwidth of 20MHz, and the center frequency of two adjacent channels is spaced at 5MHz
The closer the channels, the greater the interference with each other:
20MHz bandwidth: Channels and channels are completely free of interference with each other.
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