Whether it is a home or a business user, there are many options when looking for a wireless local area network (WLAN) solution. Many products support Wi-Fi technology standards such as 802.11a, 802.11b, 802.11g and 802.11n. In addition, there are Bluetooth and various other non-Wi-Fi technologies, which have their own specific network standards.
This article will introduce you to the comparison of Wi-Fi and related technologies in order to help readers choose the wireless network application that suits them.
802.11 standard
In 1997, the Institute of Electrical and Electronic Engineers (IEEE) formulated the first wireless LAN standard 802.11, which is mainly used to solve the wireless access of users and user terminals in office LANs and campus networks. The business is mainly limited to data access, and the highest rate is only It can reach 2Mbps. Because it cannot meet people's needs in terms of speed and transmission distance, 802.11 wireless products are no longer produced.
802.11n
This standard is the latest standard released by IEEE. 802.11n adopts smart antenna technology, which can change the transmission rate of WLAN from 54Mbps and 108Mbps provided by 802.11a and 802.11g to 300Mbps or even 600Mbps. Thanks to the MIMO OFDM technology that combines MIMO (Multiple Input Multiple Output) and OFDM (Orthogonal Frequency Division Multiplexing) technology, the wireless transmission quality is improved and the transmission rate is greatly improved.
In addition, 802.11n uses a software radio technology, which is a fully programmable hardware platform, so that base stations and terminals of different systems can achieve intercommunication and compatibility through different software on this platform, which makes WLAN compatibility Greatly improved. This means that WLAN will not only be compatible with 802.11n forwards and backwards, but also can realize the combination of WLAN and wireless wide-area networks, such as 3G.
Advantages of 802.11n-has the fastest network speed and the widest signal coverage; signal interference has less impact.
Disadvantages of 802.11n-the standard has not been formally determined; the cost is higher; the use of multiple signals can easily interfere with the accessory 802.11b/g network.
802.11g
Between 2002 and 2003, WLAN products began to have a brand new standard 802.11g. 802.11g combines the advantages of both 802.11a and 802.11b, and can be said to be a hybrid standard. It can adapt to the traditional 802.11b standard, providing a data transmission rate of 11Mbit/s per second at the 2.4GHz frequency, and it also conforms to the 802.11a standard to provide a data transmission rate of 56Mbit/s at a frequency of 5GHz.
802.11g advantages-higher network speed; good signal quality, not easy to be blocked.
Disadvantages of 802.11g-the cost is higher than that of 802.11b; electrical equipment may affect the 2.4GHz band signal.
802.11b
In July 1999, the IEEE expanded the 802.11 application standard and created the 802.11b standard. Compared with traditional Ethernet, this standard can support a data transfer rate of up to 11Mbps. 802.11b inherits the wireless signal frequency standard of 802.11 and adopts 2.4GHz direct sequence spread spectrum. Manufacturers are also more willing to adopt this frequency standard because it can reduce product costs. On the other hand, due to the use of unregulated 2.4GHz spread spectrum, wireless LAN signals are also easily interfered by signals from microwave ovens, cordless phones, or other electrical equipment. Of course, solving this problem is also very simple. When installing 802.11b devices, pay attention to keeping a certain distance from other devices.
Advantages of 802.11b-low cost; better signal radiation, not easy to be blocked.
Disadvantages of 802.11b-the bandwidth rate is low; the signal is susceptible to interference.
802.11a
When 802.11b was still under development, IEEE created another wireless LAN standard, 802.11a. Because 802.11b is more popular than 802.11a, some people think that 802.11a was created after 802.11b. In fact, 802.11a and 802.11b were created at almost the same time. Due to the high cost of 802.11a, it is mainly used in the commercial field, while 802.11b is mainly used in the home market.
The highest data transmission rate provided by 802.11a is 54Mbps, and it works in the 5GHz frequency band. This higher frequency also means that 802.11a signals are more susceptible to the influence of walls or other obstacles.
In addition, because 802.11a and 802.11b use different frequency standards, the two are incompatible with each other. For this reason, some manufacturers provide 802.11a/b network modules in their computers to cope with the needs of wireless networking in different environments.
Advantages of 802.11a-has a higher network speed; the signal is not easy to be interfered.
Disadvantages of 802.11a-higher cost; the signal is easily blocked by obstacles.
Bluetooth and others
In addition to the four common Wi-Fi standards mentioned above, there are other wireless network technologies.
Other IEEE802.11 working group standards such as 802.11h and 802.11j, they also exist as an extended branch of Wi-Fi technology.
Bluetooth is an alternative wireless network technology that complements the 802.11 family. Bluetooth can realize network transmission (1~3Mbps rate) on low-power network devices within a short distance (about 10 meters), such as handheld computers, Bluetooth mobile phones, etc. The low manufacturing cost of Bluetooth makes Bluetooth quickly form an industrial scale. Nowadays, you can see PDAs and smart phones using Bluetooth technology anytime and anywhere. However, Bluetooth is rarely used in WLAN networks, because the disadvantages of Bluetooth application range and transmission rate are taken into consideration.
WiMax (also known as 802.16) is an emerging broadband wireless access technology that can provide high-speed Internet-facing connections with data transmission distances of up to 50km. WiMAX is also a technical system for the future public wireless broadband data network proposed by the Internet camp, which represents the broadband and intelligent characteristics of future wireless communication systems, such as protocol structure and network structure flattening, support for high-speed data transmission and seamless roaming, and support Various types of services are guaranteed QoS at the MAC layer and the physical layer.
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