From Introduction to 802.16 WiMax, Wireless Broadband Technology, Market, Operation and Services
Dynamic Frequency Selection (DFS)
Dynamic frequency selection is a process that allows devices or users to request, select or change an operating frequency at various times. Dynamic frequency selection involves sensing and assigning communication channels (such as radio frequencies) to transmitters (such as a radio base station) as they are required. The use of dynamic frequency selection in a WiMax system allows for interference avoidance.
Interference avoidance is a process that adapts the access channel sharing method so that the transmission does not occur on specific frequency bandwidths. By using interference avoidance, devices that operate within the same frequency band and within the same physical area can detect the presence of each other and adjust their communication system to reduce the amount of overlap (interference) caused by each other. This reduced level of interference increases the amount of successful transmissions therefore increasing the overall efficiency and increased overall data transmission rate. Dynamic frequency selection is used by WiMax systems that operate in unlicensed frequency bands.
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Topics of Interest
The WiMax system operates by coordinating the access to the radio channels and sending packets of data between base stations and subscriber stations. The basic operation of a WiMax system involves...
Dynamic Frequency Selection (DFS) Dynamic frequency selection is a process that allows devices or users to request, select or change an operating frequency at various times. Dynamic frequency...
Frequency Reuse Frequency reuse is the process of using the same radio frequencies on radio transmitter sites within a geographic area that are separated by sufficient distance to cause minimal...
Frequency Reuse Frequency reuse is the process of using the same radio frequencies on radio transmitter sites within a geographic area that are separated by sufficient distance to cause minimal...
Frequency Bands Frequency bands are the range of frequencies that are used or allocated for radio services. There are two primary frequency bands defined for WiMax systems; 10 to 66 GHz (the...
