Introduction to wimax
WiMAX is a wireless digital communication technology based on IEEE 802.16 and ETSI HiperMAN wireless metropolitan area network (MAN) standards. It can provide up to 50 kilometers of broadband wireless access (BWA) for fixed stations (such as desktop computers) and 5 to 15 kilometers of broadband for mobile stations (such as laptops, mobile phones, personal media players and PDAs) Wireless access.
Compared with Wi-Fi and other wireless technologies, WiMAX has stronger anti-interference and can provide higher bandwidth utilization.
And can transmit data at a higher rate over a longer distance. WiMAX can operate on licensed and unlicensed frequencies,
Therefore, it can provide a standardized environment and a feasible economic model for the wireless carrier. These advantages combined with worldwide technical support (such as ongoing deployment, spectrum allocation, and standardization) have made WiMAX the first choice for quickly and cost-effectively opening ultra-fast broadband wireless access in areas not covered by global services.
wimax technology
The fixed version of WiMAX (IEEE 802.16-2004) can use the 2-11 GHz frequency band to provide non-line-of-sight (NLOS) transmission to fixed equipment. Higher frequencies require coverage within line of sight. Fixed WiMAX can provide high-throughput broadband connections at up to 75 Mbps over a distance of 30 miles. It is based on Orthogonal Frequency Division Multiple Access (OFDM), uses multiple pilot tones, and supports a modulation range from BPSK to 64 QAM. WiMAX systems can use a variety of bandwidths from 1 to 28 MHz in licensed or unlicensed spectrum, including 256 subcarriers (192 data subcarriers). It can be used for various applications such as "last mile" broadband connections, hotspots and cellular backhaul, and high-speed enterprise connections for enterprises.
The mobile version of the standard, IEEE 802.16e-2005, is an extension of 802.16-2004 and is used for mobile applications in the 2-6 GHz frequency band (see table). It can build WiMAX technology into laptops and other mobile devices.
Table 1. Comparison of 802.16 wireless technologies.
The WiMAX Forum is an industry-leading organization that helps accelerate the deployment of broadband wireless networks based on the IEEE 802.16 standard. The forum was created in 2001 to achieve this goal by verifying the consistency and interoperability of broadband wireless products.
Can pass the WiMAX in any of the three certification laboratories (WFDCL) designated by the WiMAX Forum
Forum certification testing and verification procedures for certification. These laboratories include: the AT4 wireless laboratory in Spain, the Korea Telecommunications Technology Association and the China Academy of Telecommunication Research of the Ministry of Information Industry of China.
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