Briefly describe the concept of WiMAX and its technical characteristics

WiMAX enables longer transmission distances.

Provide faster broadband access.

Deliver excellent last-mile network access.

Provide multi-** communication services.

In order to compare WiMAX and Wi-Fi technologies, the transmission range, transmission speed, network security, and standard competition between the two are analyzed here.

1 Transmission range analysis.

WiMAX is designed to operate in licensed wireless bands, as well as public wireless bands. As long as the system company has a license for the wireless band, WiMAX can transmit with more bandwidth, more time and more power when WiMAX is allowed to operate in the authorized frequency band. In general, only wireless IS 7 enterprises will use WiMAX technology with licensed bandwidth.

As for the Wi-Fi design, it only works between 2 4 GHz and 5 GHz in the public frequency band. The Federal Communications Commission (FCC) in the United States stipulates that Wi-Fi transmission power should be between 1 milliwatt and 100 milliwatts. The transmission power of the average WiMAX is about 100 kilowatts, so the power of Wi-Fi is about one millionth of that of WiMax.

It is also obvious that a WiMAX base station that uses a Wi-Fi base station with one million times the transmission power will have a larger transmission distance than a Wi-Fi terminal.

While WiMAX obviously has a long transmission range, it is important to note that there is an authorized radio band to use it when using WiMAX base stations. And if WiMax, like Wi-Fi, uses unlicensed operating frequency bands, then its transmission advantage disappears. Both WiMAX and Wi-Fi are based on wireless frequency band transmission technology, so they are limited by the same laws of physics.

Conversely, if Wi-Fi is allowed to use the licensed frequency band under the same conditions, Wi-Fi can also have a larger transmission range like Wi-MAX. In addition, while WiMAX can take advantage of newer multipath processing technology, it is also used in Wi-Fi products with the new Pre-NMIMO (Multi-Antenna Bidirectional Transmission) technology.

What's that thing in the back?

At present, from 3G to WLAN and WiMAX, and from UWB to Zigbee, the diversified development pattern of wireless communication is becoming increasingly apparent. Industry insiders believe that although various wireless technology applications are "competing for the current", facing the future, the complementarity and integration of different technologies will become the general trend. As long as we accurately grasp the general trend of the development of the wireless communication industry, find out the positioning of different wireless technologies, and promote it rationally and pragmatically guided by market demand, the wireless communication industry will usher in a better future.

The complementary integration of various wireless technologies has become the general trend, and WiMAX will become an effective supplement to 3G networks.

It should be noted that diversified wireless technologies not only add vitality to the development of the industry, but also bring new challenges to the existing telecom operation pattern. In the past two years, with the emergence of various broadband wireless technologies, people have all kinds of doubts about the development prospects of 3G, and even statements such as "WiMAX will be the terminator of 3G". Industry insiders believe that due to the different technical characteristics, facing the future, various wireless technologies, including 3G, WLAN, Wimax, UWB, Zigbee, etc., will develop together in complementary integration, rather than ending or replacing each other.

In fact, at the beginning of the promotion and application of WLAN, there was a voice in the industry that "WLAN will replace 3G". In recent years, the repeated postponement of the global 3G commercial process has indeed provided a good opportunity for the rapid deployment of WLAN with high-speed Internet access capabilities. However, from the analysis of comprehensive factors such as coverage area, transmission rate, basic service type, roaming, mobile rate, forward expansion and evolution, etc., 3G and WLAN are more complementary.

Judging from the actual situation in recent years, although WLAN has been deployed on a large scale in some hot spots, it has not formed a head-on competition with 3G, so it is obviously biased to believe that WLAN will replace 3G.

Similar to WLAN, although WiMAX technology is maturing and the industrialization process is accelerating, WiMAX will not be the end of 3G. Industry experts believe that although WiMAX transmission rates far exceed 3G, WiMAX and 3G are not positioned in the same way. As a metro network technology for broadband wireless access, WiMAX's market goal is to provide a point-to-multipoint broadband wireless access means in metropolitan area network areas, and its market positioning is in the category of broadband wireless metro network.

The positioning of 3G is based on wireless WANs, providing voice and multi-** data services to the public, and can achieve global roaming. From a technical point of view, WiMAX does not yet have the characteristics of wide-area roaming, security, and terminal portability of 3G public mobile communication networks, and lacks the ability to support high-quality real-time voice services. In addition, WiMAX is still about two years away from official commercial use, and it will take about five years for large-scale popularization.

Therefore, WiMAX and 3G are not a substitute for each other, and WiMAX can be used as an effective supplement to 3G networks in the field of high-speed wireless broadband access.

Advantages of Wimax:

First, to achieve a longer transmission distance: WiMAX can achieve a wireless signal transmission distance of 50 kilometers is incomparable to the local area network of the Wuxiao Hall line, and the network coverage area is 10 times that of the 3G transmission tower.

Second, provide higher-speed broadband access: The maximum access speed that WiMAX can provide is 70M, which is 30 times the broadband speed that 3G can provide.

3. Provide excellent last-mile network access services: As a wireless metro network technology, it can connect Wi-Fi hotspots to the Internet, and can also be used as a wireless extension of wired access methods such as DSL to achieve last-mile broadband access.

Fourth, provide multi-** communication services: Because WiMAX has better scalability and security than Wi-Fi, it can achieve carrier-class multi-** communication services.

Disadvantages of Wimax:

1. Standardly, WiMAX technology cannot support users to switch seamlessly during the mobile process. Its speed is only 50 kilometers, and if it moves at high speeds, WiMAX cannot meet the requirements of seamless switching, and compared with the three mainstream standards of 3G, its performance is far behind.

Second, WiMAX is not strictly a standard for mobile communication systems, but also a wireless metropolitan area network technology. At present, there are two views in the industry: WiMAX and 3G form a competitive situation, and eventually replace 3G; WiMAX is an access technology that complements 3G.

3. WiMAX can only become a mobile communication system with seamless switching function. The WiMAX camp pinned its hopes on solving this problem on the future 16M standard, but there are still uncertainties about the progress of 16M.

Problems with Wimax:

The technology is complex and the cost is high.

WiMAX has a long propagation distance and a complex circumference to the environment, resulting in a complex technology. The cost of a WiMAX base station is about $20,000.

The IEEE estimates that broadband wireless will only be a last-mile service if the average cost per unit of subscriber falls below $300 and the base station falls below $10,000.

WiMAX can be used as an extension of the network, not to replace IEEE, but to integrate with .