Comparative Analysis of WiMax Key Technologies[pic] Comparative Analysis of WiMax Key TechnologiesLiu Xin and Wang Changlin (School of Computer and Communication Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan)Abstract: WiMax is an emerging wireless data access network standard, which has great advantages in coverage and transmission speed. This paper describes its basic characteristics, and analyzes its typical technologies, application scope and development prospects more vividly by comparing with previous access standards. Keywords: WiMax, Wi-Fi, ARQ, TDMA, antenna arrayWith the continuous development of information technology, people\'s demand for communication networks is also increasing. When the core network bandwidth has reached the Tbit level, the bandwidth rate of the access network has become a bottleneck restricting high-speed data transmission. WiMax, the full name of which is World Interoperability for Microwave Access, is a wireless metropolitan area network (WMAN) access technology. It is synonymous with the 802.16a standard and can provide a coverage range of 50 kilometers and a peak speed of up to 70Mbit/s. This article focuses on the key technologies of WiMax and compares it with its previous standard Wi-Fi, analyzing its strong bandwidth advantages and its ability to carry data services. 1. Introduction to WiMax WiMax, a Broadband Wireless Access (BWA) standard. That is, 802.16a. It is a new air interface standard proposed for microwave and millimeter wave frequency bands. It is used to connect 802.11a wireless access hotspots to the Internet, and can also connect companies and homes to wired backbone lines. It can be used as a wireless extension technology for cable and DSL, thereby achieving the last mile access of wireless broadband. Its frequency is 2-11GHz, the maximum transmission distance is 31 miles (50 kilometers), the maximum data rate per segment is 70Mbps per sector, each base station is usually equipped with 6 sectors, and each sector can support more than 60 sectors at the same time...
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