With the continuous development of science and technology, the local area network is gradually developing towards wireless and multi-network integration. In the rapid development process of multi-network integration, it has driven the wide application of multiple wireless technologies. WIFI is one of them. One.
At present, the smart home industry is also in full swing. It is foreseeable that the future development of smart homes will no longer be limited to remote control of home appliances, lighting, etc. Embedded smart terminals, wireless WIFI technology, and the widespread use of the Internet will surely Making home control more automated, intelligent and user-friendly will definitely change the traditional smart home model and push smart home onto a fast-paced stage.
One: WIFI technology principle and application
WiFi full name WirelessFidelity, its biggest advantage is the high transmission speed, can reach 54Mbps, and its effective distance is also very long, its main characteristics are: fast, high reliability, in the open area, communication distance can reach 305 meters In the closed area, the communication distance is 76 meters to 122 meters, which is convenient to integrate with the existing wired Ethernet network. The cost of networking is lower. The outstanding advantages of Wi-Fi technology are:
First, the coverage of radio waves is wide, and the radius of WiFi can reach 100 meters. The office can be used in the whole building.
Second, the transmission speed is very fast, can reach 11mbps, in line with the needs of personal and social information.
Compared with wired networks, it has many advantages:
No wiring required
The main advantage of WiFi is that it does not require wiring and can be free from the restrictions of wiring conditions, so it is very suitable for the needs of mobile office users and has broad market prospects. At present, it has expanded from traditional industries such as healthcare, inventory control and management services to more industries, and even entered the family and educational institutions.
health and safety
The way the wireless network is used is not like the direct contact of the phone with the human body, it should be absolutely safe.
Simple assembly method
Generally, the basic equipment for setting up a wireless network is a wireless network card and an AP. In this way, the network resources can be shared in a wireless mode and with the existing wired architecture, and the installation cost and complicated procedures are far lower than the traditional wired network. If you only have a peer-to-peer network of several computers, you can also do not need an AP. You only need to have a wireless network card for each computer. An AP is an abbreviation of AccessPoint and is generally translated as a "wireless access node" or a "bridge". It mainly acts as a bridge between wireless workstations and wired local area networks in the media access control layer MAC. With an AP, like a Hub for a typical wired network, a wireless workstation can be quickly and easily connected to the network. Especially for the use of broadband, WiFi is more advantageous. After the cable broadband network (ADSL, residential LAN, etc.) arrives at the home, connect to an AP, and then install a wireless network card in the computer. An ordinary family has an AP enough. Even if the user's neighborhood is authorized, you can access the Internet in a shared way without adding a port.
Working long distance
Do not look at the working distance of wireless WiFi is not large, in the case of complete network construction, 802.11b real working distance can reach more than 100 meters, and solve the problem of error correction, error code, high-speed mobile data, WiFiI equipment and equipment Switching and security authentication between the device and the base station are well solved.
All in all, the demand for mobile connectivity for home and small office network users is the driving force behind the growth of the wireless LAN market.
Two: Comparison of WIFI and 3G and Bluetooth technology
WIFI and 3G complement each other
1. Voice and WLAN
Compared with 3G technology that satisfies large traffic and multiple users, WLAN networks based on IP technology are more suitable for broadcasting voice services (PTT, multi-party conferences, long-distance calls, advertisements, etc.).
2. Data service under wide area coverage and area coverage
Compared with the 3G technology coverage and the 144kbit data rate when moving fast, WIFI technology has an absolute advantage in meeting the needs of users for high-speed data transmission in a specific area.
3. Utilization of wireless channel resources
The frequency resources allocated by 3G are limited, and the occupancy rate of the data service to the channel is extremely high, which affects the number of voice users that are simultaneously accessed. If you plan to transfer data traffic to the WiFi/WiMAX public data channel in a specific area (such as a business center crowded area), it will undoubtedly greatly improve the utilization of 3G wireless network resources.
4. Handheld terminal combined with Laptop/PDA
The high data rate, Always0nLine and low usage Laptop/PDA can meet the needs of business users with a large amount of information: the more convenient and compact 3G handheld terminal can meet the needs of individual users for fast messages.
WIFI and Bluetooth technology
Bluetooth technology features:
Slow speed;
Generally used to transmit small data without a network;
Connect Bluetooth accessories;
Can't connect to the network, can't get online;
Within 10 meters.
Wi-Fi technology features:
Can be connected to the public network to provide web browsing capabilities;
high speed;
Transfer big data;
Within 100 meters.
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